(19)
(11)EP 3 432 013 A1

(12)EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(43)Date of publication:
23.01.2019 Bulletin 2019/04

(21)Application number: 17873081.8

(22)Date of filing:  12.07.2017
(51)International Patent Classification (IPC): 
G01R 31/12(2006.01)
G01R 31/36(2019.01)
(86)International application number:
PCT/KR2017/007477
(87)International publication number:
WO 2018/097444 (31.05.2018 Gazette  2018/22)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA MD

(30)Priority: 25.11.2016 KR 20160158504

(71)Applicant: LG Chem, Ltd.
Seoul 07336 (KR)

(72)Inventors:
  • YOON, Ho Byung
    Daejeon 34122 (KR)
  • KIM, Younghwan
    Daejeon 34122 (KR)
  • LEE, Sang Hoon
    Daejeon 34122 (KR)
  • LEE, Hujun
    Daejeon 34122 (KR)

(74)Representative: Cabinet Plasseraud 
66, rue de la Chaussée d'Antin
75440 Paris Cedex 09
75440 Paris Cedex 09 (FR)

  


(54)SYSTEM FOR DIAGNOSING INSULATING ELEMENT IN BMS


(57) The present invention relates to a system for diagnosing an insulation element within a battery management system (BMS), in which an input terminal and an output terminal of an insulation element obtain a battery pack diagnosis signal that is output through a battery monitoring circuit and passes through the insulation element, and then abnormality of the insulation element is diagnosed based on a bit operation value of the obtained battery pack diagnosis signal, or an input terminal and an output terminal of the insulation element obtain a transceived communication signal and then abnormality of the insulation element is diagnosed based on a bit operation value of the obtained transceived communication signal.




Description

[Technical Field]



[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2016-0158504 filed in the Korean Intellectual Property Office on November 25, 2016, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a system for diagnosing an insulation element within a battery management system (BMS), and more particularly, to a system for diagnosing an insulation element within a BMS, in which when abnormality of an insulation element dividing a BMS according to a voltage region is diagnosed, an input terminal and an output terminal of an insulation element obtain a battery pack diagnosis signal that is output through a battery monitoring circuit and passes through the insulation element, and then abnormality of the insulation element is diagnosed based on a bit operation value of the obtained battery pack diagnosis signal, or an input terminal and an output terminal of the insulation element obtain a transceived communication signal and then abnormality of the insulation element is diagnosed based on a bit operation value of the obtained transceived communication signal.

[Background Art]



[0003] In general, a battery management system (BMS) applied to an electric vehicle is connected with a battery pack including a plurality of battery cells to manage various battery states of the battery pack.

[0004] In this case, the BMS may be generally divided into a high-voltage region that is connected with a battery cell and senses a voltage of the battery cell, and a low-voltage region that is connected with a vehicle, and in this case, the high-voltage region and the low-voltage region maintain an insulation state by means of an insulation element interposed therebetween.

[0005] Further, various diagnosis information about the battery cell sensed in the high-voltage region may be transmitted to an operation processing unit (micro controller unit (MCU)) positioned in the low-voltage region through the insulation element. In this case, when abnormality is generated in the insulation element, an erroneous operation of the BMS, such as the opening of a contactor, may be caused due to a generation of a problem in the transmitted various diagnosis information of the battery cell, and there is no technology for autonomously diagnosing the generation of abnormality of the insulation element, so that actually, there is a problem in stability, such as explosion of a battery pack, due to a failure of the reception of a diagnosis result.

[0006] In this respect, in order to solve the problems and the limits of the insulation element to which the BMS is applied in the related art, the present inventors developed a system for diagnosing an insulation element within a BMS, in which an input terminal and an output terminal of an insulation element obtain a battery pack diagnosis signal that is output through a battery monitoring circuit and passes through the insulation element, and then abnormality of the insulation element is diagnosed based on a bit operation value of the obtained battery pack diagnosis signal, or an input terminal and an output terminal of the insulation element obtain a transceived communication signal and then abnormality of the insulation element is diagnosed based on a bit operation value of the obtained transceived communication signal.

[Technical Problem]



[0007] The present invention is conceived to solve the foregoing problems, and an object of the present invention is to provide a system for diagnosing an insulation element within a battery management system (BMS) in which when abnormality of an insulation element dividing a BMS according to a voltage region is diagnosed, an input terminal and an output terminal of an insulation element obtain a battery pack diagnosis signal that is output through a battery monitoring circuit and passes through the insulation element, and then abnormality of the insulation element is diagnosed based on a bit operation value of the obtained battery pack diagnosis signal, or an input terminal and an output terminal of the insulation element obtain a transceived communication signal and then abnormality of the insulation element is diagnosed based on a bit operation value of the obtained transceived communication signal.

[Technical Solution]



[0008] An exemplary embodiment of the present invention provides a system for diagnosing an insulation element within a battery management system (BMS), the system including: in a BMS divided into a first voltage region and a second voltage region by an insulation element, a comparing unit which compares an input signal input through an input terminal of the insulation element in the first voltage region with an output signal output to the second voltage region through an output terminal of the insulation element and then outputs a comparison result; and first and second operation units which determine whether the insulation element is erroneously operated based on the comparison result.

[0009] In the exemplary embodiment, the comparing unit may include at least one of a first comparing unit which compares a front-end battery diagnosis signal input through the input terminal of the insulation element in the first voltage region with a rear-end battery diagnosis signal output to the second voltage region through the output terminal of the insulation element and then provides a first operation unit within the BMS with a comparison result, and a second comparing unit which compares a communication signal for transmission transmitted from the first voltage region to the second voltage region through the insulation element with a communication signal for reception transmitted from the second voltage region to the first voltage region through the insulation element and then provides the second operation unit within the BMS with a comparison result.

[0010] In the exemplary embodiment, the first comparing unit may include at least one of: a first differential amplifying and comparing device which amplifies a difference between the obtained front-end battery diagnosis signal and the obtained rear-end battery diagnosis signal and then provides the first operation unit with an amplified result value; and a first adding and comparing device which adds a bit value of the obtained front-end battery diagnosis signal and a bit value of the obtained rear-end battery diagnosis signal and then provides the first operation unit with an added result value.

[0011] In the exemplary embodiment, the first differential amplifying and comparing device may be a differential amplifier (operational amplifier (OP AMP)) and the first adding and comparing device may be an XOR gate, and the bit value of the obtained front-end battery diagnosis signal and the bit value of the obtained rear-end battery diagnosis signal may be added by using an XOR gate circuit.

[0012] In the exemplary embodiment, when the result value amplified by the first differential amplifying and comparing device is less than a specific threshold value, the first operation unit may determine that the insulation element is erroneously operated.

[0013] In the exemplary embodiment, when the result value added by the first adding and comparing device corresponds to a high bit value corresponding to 1, the first operation unit may determine that the insulation element is erroneously operated.

[0014] In the exemplary embodiment, the second comparing unit may include: a second differential amplifying and comparing device which amplifies a difference between a communication signal for front-end transmission obtained through the input terminal of the insulation element and a communication signal for rear-end transmission obtained through the output terminal of the insulation element among the communication signals for transmission and then outputs an amplified result value; a third differential amplifying and comparing device which amplifies a difference between a communication signal for front-end reception obtained through the input terminal of the insulation element and a communication signal for rear-end reception obtained through the output terminal of the insulation element among the communication signals for reception and then outputs an amplified result value; and a second adding and comparing device which OR-operates the result value output from each of the second and third differential amplifying and comparing devices and then provides the second operation unit with an operated result value.

[0015] In the exemplary embodiment, the second and third differential amplifying and comparing devices may be differential amplifiers (OP AMPs), and the second adding and comparing device may be an OR gate.

[0016] In the exemplary embodiment, when the result value OR-operated by the second adding and comparing device corresponds to a high bit value corresponding to 1, the second operation unit may determine that the insulation element may be erroneously operated.

[Advantageous Effects]



[0017] According to one aspect of the present invention, an input terminal and an output terminal of an insulation element obtain a battery pack diagnosis signal that is output through a battery monitoring circuit and passes through the insulation element, and then abnormality of the insulation element is diagnosed based on a bit operation value of the obtained battery pack diagnosis signal, or an input terminal and an output terminal of the insulation element obtain a transceived communication signal and then abnormality of the insulation element is diagnosed based on a bit operation value of the obtained transceived communication signal, so that there is an advantage in that it is possible to diagnose the generation of abnormality of a communication function by using the insulation element in advance and improve stability of an operation of the BMS.

[Brief Description of Drawings]



[0018] 

FIG. 1 is a diagram schematically illustrating a configuration of a battery management system (BMS) 2 to which a system 100 for diagnosing an insulation element within a BMS according to an exemplary embodiment of the present invention is applied.

FIG. 2 is a diagram illustrating an exemplary embodiment of the system 100 for diagnosing an insulation element within a BMS illustrated in FIG. 1.

FIG. 3 is a diagram illustrating a configuration of a system 100' for diagnosing an insulation element within a BMS implemented through another exemplary embodiment of the system 100 for diagnosing an insulation element within a BMS illustrated in FIG. 2.

FIG. 4 is a diagram illustrating a configuration of a system 100" for diagnosing an insulation element within a BMS implemented through another exemplary embodiment of the system 100 and 100' for diagnosing an insulation element within a BMS illustrated in FIGS. 2 and 3.


[Best Mode]



[0019] Hereinafter, an exemplary embodiment is presented for helping understanding of the present invention. However, the exemplary embodiment below is simply provided for easier understanding of the present invention, and the contents of the present invention are not limited by the exemplary embodiment.

[0020] FIG. 1 is a diagram schematically illustrating a configuration of a battery management system (BMS) 2 to which a system 100 for diagnosing an insulation element within a BMS according to an exemplary embodiment of the present invention is applied, and FIG. 2 is a diagram illustrating an exemplary embodiment of the system 100 for diagnosing an insulation element within a BMS illustrated in FIG. 1.

[0021] Referring to FIGS. 1 and 2, the system 100 for diagnosing an insulation element within a BMS according to the present invention may be provided inside the BMS 2 which obtains voltage information, temperature information, and the like of each battery cell 1a from a battery pack 1.

[0022] The BMS 2 may be generally divided into a first region and a second region through an insulation element 4, and in this case, the first region may mean a high-voltage region in which a battery monitoring circuit 3 is provided, and may mean a low-voltage region in which a comparing device 110, a first operation unit 120, a second operation unit 130, a controller 5, and the like according to the present invention are provided.

[0023] Herein, the first operation unit may be a central processing unit (micro controller unit (MCU)) which is capable of wirelessly communicating with the battery monitoring circuit 3, and the second operation unit 130 may mean a safe central processing unit (safe microcontroller unit) which receives a battery pack diagnosis signal from the battery monitoring circuit 3.

[0024] That is, the BMS 2 may be divided into the first region and the second region through the insulation element 4, the first region and the second region may correspond to insulation states, and all of various information about the battery cell 1a provided from the battery monitoring circuit 3 or a communication signal for communication with the first operation unit 120 may be transmitted from the first region to the second region, or from the second region to the first region through the insulation element 4.

[0025] In the meantime, the system 100 for diagnosing an insulation element within a BMS according to the present invention may have the configurations through various exemplary embodiments as illustrated in FIGS. 2 to 4, so that the system 100 will be described in more detail with reference to FIGS. 2 to 4.

[0026] FIG. 2 is a diagram illustrating an exemplary embodiment of the system 100 for diagnosing an insulation element within a BMS illustrated in FIG. 1, FIG. 3 is a diagram illustrating a configuration of a system 100' for diagnosing an insulation element within a BMS implemented through another exemplary embodiment of the system 100 for diagnosing an insulation element within a BMS illustrated in FIG. 2, and FIG. 4 is a diagram illustrating a configuration of a system 100" for diagnosing an insulation element within a BMS implemented through another exemplary embodiment of the system 100 and 100' for diagnosing an insulation element within a BMS illustrated in FIGS. 2 and 3.

[0027] The comparing device 110 of the system 100 for diagnosing an insulation element within a BMS illustrated in FIG. 2 may include a first comparing unit 111 which compares a front-end battery diagnosis signal input through an input terminal of the insulation element 4 in a first voltage region with a rear-end battery diagnosis signal output to a second voltage region through an output terminal of the insulation element 4, and then provides the first operation unit 120 with a comparison result.

[0028] The first comparing unit 111 may include a first differential amplifying and comparing device 111a which amplifies a difference between the obtained front-end battery diagnosis signal and the obtained rear-end battery diagnosis signal and then provides the first operation unit 120 with an amplified result value, or a first adding and comparing device 111b which adds a bit value of the obtained front-end battery diagnosis signal and a bit value of the obtained rear-end battery diagnosis signal and provides the first operation unit 120 with a result value of the addition as illustrated in FIG. 3.

[0029] That is, the system 100 of FIG. 2 has the same configuration as that of FIG. 3, but the first adding and comparing device 111b may be applied instead of the first differential amplifying and comparing device 111a of FIG. 2.

[0030] Herein, the first differential amplifying and comparing device 111a may mean a general differential amplifier (operational amplifier (OP AMP)), and the first adding and comparing device 111b may mean an exclusive OR gate (XOR gate).

[0031] The first differential amplifying and comparing device 111a may serve to amplify a difference between a front-end battery diagnosis signal and a rear-end battery diagnosis signal and then transmit the amplified value to the first operation unit 120, and when the result value amplified through the first differential amplifying and comparing device 111a is less than a specific threshold value, the first operation unit 120 determines that abnormality is generated in the insulation element 4.

[0032] Herein, the case where the result value amplified through the first differential amplifying and comparing device 111a is less than the specific threshold value means that there is no difference in a voltage between the first voltage region that is an input terminal side of the insulation element and the second voltage region that is an output terminal side of the insulation element, and may mean that the insulation is not properly performed, so that the first differential amplifying and comparing device 111a may be applied for detecting the improper insulation.

[0033] First, the first adding and comparing device 111b XOR-operates a low bit (0) and a high bit (1) that are bit values of the front-end battery diagnosis signal and a low bit (0) and a high bit (1) that are bit values of the rear-end battery diagnosis signal, so that when a result value of the operation is the high bit value corresponding to 1, it is determined that abnormality is generated in the insulation element 4.

[0034] Next, referring to FIG. 4, a system 100" for diagnosing an insulation element within a BMS illustrated in FIG. 4 may include a second comparing unit 112 which compares a communication signal TX for transmission transmitted from the first voltage region to the second voltage region through the insulation element with a communication signal RX for reception transmitted from the second voltage region to the first voltage region through the insulation element, and then provides the second operation unit 130 with a comparison result, instead of the first differential amplifying and comparing device 111a and the first adding and comparing device 111b included in FIGS. 2 and 3.

[0035] The second comparing unit 112 may include a second differential amplifying and comparing device 112a which amplifies a difference between a communication signal for front-end transmission obtained through the input terminal of the insulation element 4 and a communication signal for rear-end transmission obtained through the output terminal of the insulation element 4 among the communication signals for transmission transmitted to from the first voltage region to the first operation unit 120 through the insulation element 4 and then outputs an amplified result value, a third differential amplifying and comparing device 112b which amplifies a difference between a communication signal for front-end reception obtained through the input terminal of the insulation element 4 (herein, the input terminal may mean the output terminal through which the communication signal for rear-end transmission is output) and a communication signal for rear-end reception obtained through the output terminal of the insulation element 4 (herein, the output terminal may mean the input terminal to which the communication signal for front-end transmission is input) among the communication signals for transmission transmitted from the second voltage region to the first voltage region through the insulation element 4 and then outputs an amplified result value, and a second adding and comparing device 112c which OR-operates the result value output from each of the second and third differential amplifying and comparing devices 112a and 112b and then provides the second operation unit 130 with an operated result value.

[0036] Herein, similar to the first differential amplifying and comparing device 111a, the second and third differential amplifying and comparing devices 112a and 112b may be differential amplifiers (OP AMPs), and the second adding and comparing device 112c may be an OR gate.

[0037] Accordingly, the second and third differential amplifying and comparing devices 112a and 112b amplify the difference between the communication signal for front-end transmission and the communication signal for rear-end transmission and the difference between the communication signal for front-end reception and the communication signal for rear-end reception, respectively, and then transmit the amplified values to the second adding and comparing unit 112c.

[0038] The second adding and comparing device 112c OR-operates the bit values of the amplified values and determines that abnormality is generated in the insulation element 4 when a result value of the operation is the high bit value corresponding to 1.

[0039] In the forgoing, the present invention has been described with reference to the exemplary embodiment of the present invention, but those skilled in the art may appreciate that the present invention may be variously corrected and changed within the range without departing from the spirit and the area of the present invention described in the appending claims.


Claims

1. A system for diagnosing an insulation element within a battery management system (BMS), the system comprising:

in a BMS divided into a first voltage region and a second voltage region by an insulation element,

a comparing unit which compares an input signal input through an input terminal of the insulation element in the first voltage region with an output signal output to the second voltage region through an output terminal of the insulation element and then output a comparison result; and

first and second operation units which determine whether the insulation element is erroneously operated based on the comparison result.


 
2. The system of claim 1, wherein the comparing unit includes a first comparing unit which compares a front-end battery diagnosis signal input through the input terminal of the insulation element in the first voltage region with a rear-end battery diagnosis signal output to the second voltage region through the output terminal of the insulation element and then provides a first operation unit within the BMS with a comparison result.
 
3. The system of claim 2, wherein the first comparing unit includes at least one of:

a first differential amplifying and comparing device which amplifies a difference between the obtained front-end battery diagnosis signal and the obtained rear-end battery diagnosis signal and then provides the first operation unit with an amplified result value; and

a first adding and comparing device which adds a bit value of the obtained front-end battery diagnosis signal and a bit value of the obtained rear-end battery diagnosis signal and then provides the first operation unit with an added result value.


 
4. The system of claim 3, wherein the first differential amplifying and comparing device is a differential amplifier (operational amplifier (OP AMP)) and the first adding and comparing device is an XOR gate, and
the bit value of the obtained front-end battery diagnosis signal and the bit value of the obtained rear-end battery diagnosis signal are added by using an XOR gate circuit.
 
5. The system of claim 3, wherein when the result value amplified by the first differential amplifying and comparing device is less than a specific threshold value, the first operation unit determines that the insulation element is erroneously operated.
 
6. The system of claim 3, wherein when the result value added by the first adding and comparing device corresponding to a high bit value corresponding to 1, the first operation unit determines that the insulation element is erroneously operated.
 
7. The system of claim 1, wherein the comparing unit includes a second comparing unit which compares a communication signal for transmission transmitted from the first voltage region to the second voltage region through the insulation element with a communication signal for reception transmitted from the second voltage region to the first voltage region through the insulation element and then provides the second operation unit within the BMS with a comparison result.
 
8. The system of claim 7, wherein the second comparing unit includes:

a second differential amplifying and comparing device which amplifies a difference between a communication signal for front-end transmission obtained through the input terminal of the insulation element and a communication signal for rear-end transmission obtained through the output terminal of the insulation element among the communication signals for transmission and then outputs an amplified result value;

a third differential amplifying and comparing device which amplifies a difference between a communication signal for front-end reception obtained through the input terminal of the insulation element and a communication signal for rear-end reception obtained through the output terminal of the insulation element among the communication signals for reception and then outputs an amplified result value; and

a second adding and comparing device which OR-operates the result value output from each of the second and third differential amplifying and comparing devices and then provides the second operation unit with an operated result value.


 
9. The system of claim 8, wherein the second and third differential amplifying and comparing devices are differential amplifiers (OP AMPs), and the second adding and comparing device is an OR gate.
 
10. The system of claim 8, wherein when the result value OR-operated by the second adding and comparing device corresponds to a high bit value corresponding to 1, the second operation unit determines that the insulation element is erroneously operated.
 




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Cited references

REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description