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Rectangular battery

A battery and square technology, applied in the field of square batteries, can solve the problems of weak strength and distortion of the safety valve, and achieve the effect of increasing strength

Inactive Publication Date: 2014-02-19
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As mentioned above, since the safety valve is weak in strength, it is easy to be subjected to a force during the process of attaching the cover to the battery case, etc., causing troubles such as twisting.

Method used

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  • Rectangular battery
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] [Overall structure of square battery]

[0028] Hereinafter, the lithium-ion prismatic secondary battery is used as an embodiment, and the attached Figure 1 The prismatic storage battery of the present invention will be described first.

[0029] figure 1 is an external perspective view showing one embodiment of the prismatic storage battery of the present invention, figure 2 Yes figure 1 An exploded perspective view of the prismatic battery shown.

[0030] The prismatic storage battery 1 is configured such that an electrode group (power generating element) 40 is accommodated in a thin, substantially rectangular parallelepiped battery container 2 composed of a battery cover (cover member) 3 and a battery can 4, and injected with non-aqueous electrolyte. The battery cover 3 and the battery can 4 are formed of, for example, aluminum, iron, stainless steel, or the like.

[0031] The positive electrode collector plate 21 , the negative electrode collector plate 31 , a...

Embodiment approach 2

[0092] Figure 7 It is a sectional view showing the attachment structure of the battery cover and the guide tube according to Embodiment 2 of the present invention.

[0093] Embodiment 2 differs from Embodiment 1 in that the outer peripheral surface 14b of the peripheral wall portion 14 is an inclined surface.

[0094] The outer peripheral surface 14b of the peripheral wall portion 14 is formed as an inclined surface whose outer diameter gradually increases from the connection portion with the safety valve 13 to the connection portion with the base portion 12 . The inner peripheral surface 14 a of the peripheral wall portion 14 is substantially vertical, and therefore, the thickness of the peripheral wall portion 14 gradually increases from the side of the safety valve 13 to the side of the base portion 12 . The connection portion with the lower surface 12 b of the base 12 is formed thicker than the thickness of the base 12 .

[0095] By making the thickness of the periphera...

Embodiment approach 3

[0099] Figure 8 It is a sectional view showing the attachment structure of the battery cover and the guide tube according to Embodiment 3 of the present invention.

[0100] Embodiment 3 differs from Embodiment 1 in that connection end portion 82 is not formed on connection pipe 81 , and connection pipe receiving portion (stepped portion) 17 is formed between the periphery of safety valve 13 and peripheral wall portion 14 .

[0101] The connecting pipe receiving portion 17 is formed as a stepped portion at the bottom of the inner peripheral surface of the peripheral wall portion 14 . The end surface 81 a of the connection pipe 81 is in contact with the upper surface of the connection pipe receiving portion 17 .

[0102] In Embodiment 3, when attaching the connecting pipe 81 , it is only necessary to press the connecting pipe 81 into the inner peripheral surface of the peripheral wall portion 14 and press the connecting pipe 81 toward the safety valve 13 until the upper surfac...

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Abstract

A safety valve (13) is integrally formed on a battery lid (3) together with a peripheral wall portion (14) by a press or the like. The safety valve (13) is formed connecting the peripheral wall portion (14), at the bottom of a recess portion (18) depressed from the upper surface (12a) of the base (12) of the battery lid (3). The upper surface (13a) of the safety valve (13) is positioned below the lower surface of the base (12). When a pressing force (X) parallel to the upper surface (13a) of the battery lid (3) acts while a coupling pipe or the like is connected to the inner peripheral surface (14a) of the peripheral wall portion (14), the pressing force (X) can be supported by the entire thickness (T) of the base (12) (plate thickness).

Description

technical field [0001] The present invention relates to a prismatic storage battery, and more particularly, to a prismatic storage battery with a safety valve. Background technique [0002] In a prismatic storage battery typified by a lithium-ion secondary battery or the like, when an overcharged state is reached, the electrolytic solution decomposes to generate gas, and the internal pressure of the battery may increase. In order to ensure the safety of the prismatic storage battery, a safety valve is generally provided to release the gas when the internal pressure of the battery rises due to gas generation. The safety valve is formed integrally with a cover attached to close the opening of the battery can, for example, by press working. [0003] The cover is a substantially flat plate-shaped member, and the safety valve is formed thinner than its surrounding parts so as to rupture when the internal pressure of the battery reaches a predetermined value. Therefore, the safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/12H01M50/103H01M50/147H01M50/645
CPCY02E60/12H01M2/1241H01M2/0207H01M2/024H01M10/052H01M50/3425H01M50/147H01M50/103H01M50/645H01M2200/20Y02E60/10H01M50/15
Inventor 浦野和昭岩佐正明纲木拓郎
Owner HITACHI AUTOMOTIVE SYST LTD
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