(19)
(11) EP 1 768 202 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 158(3) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
04.07.2007 Bulletin 2007/27

(43) Date of publication:
28.03.2007 Bulletin 2007/13

(21) Application number: 06730407.1

(22) Date of filing: 29.03.2006
(51) International Patent Classification (IPC): 
H01M 4/02(2006.01)
 H01M 10/40(2006.01)
(86) International application number:
PCT/JP2006/306459
(87) International publication number:
WO 2006/106731 (12.10.2006 Gazette 2006/41)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 04.04.2005 JP 2005107253

(71) Applicant: Matsusita Electric Industrial Co., Ltd.
Kadoma-shi, Osaka 571-8501 (JP)

(72) Inventors:
  • FUJIKAWA, Masato,
    Chuo-ku, Osaka-shi, Osaka 540-6319, (JP)
  • SUZUKI, Kohei,
    Chuo-ku, Osaka-shi, Osaka 540-6319, (JP)
  • INOUE, Kaoru
    Chuo-ku, Osaka-shi, Osaka 540-6319, (JP)
  • SHIMADA, Mikinari
    Chuo-ku, Osaka-shi, Osaka 540-6319, (JP)

(74) Representative: TBK-Patent 
Bavariaring 4-6
80336 München
80336 München (DE)

   


(54) CYLINDRICAL LITHIUM SECONDARY BATTERY


(57) A cylindrical lithium secondary battery that is excellent in resistance to short-circuits, is capable of preventing a capacity loss due to dropping, and has a good balance in battery characteristics. The cylindrical lithium secondary battery includes: a cylindrical battery can; an electrode assembly; and a non-aqueous electrolyte. The electrode assembly has a porous heat-resistant layer that is interposed between the positive electrode and the negative electrode. The electrode assembly has a central cavity into which a hollow mandrel is inserted. The hollow mandrel has a slit that extends along the entire length thereof. The outer diameter A of the hollow mandrel and the width B of the slit satisfy the relation: 0.1≦B/A≦0.6.