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Rectangular secondary battery

A secondary battery, square technology, applied in the field of square secondary batteries, to achieve the effect of maintaining airtightness and high impact resistance

Active Publication Date: 2015-07-15
日本汽车能源株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a vulnerable part useful for safety is formed in the battery case of the sealed battery

Method used

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  • Rectangular secondary battery
  • Rectangular secondary battery

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0024] figure 1 is an external perspective view of the lithium ion secondary battery of the present embodiment, figure 2 yes figure 1 An exploded perspective view of the lithium-ion secondary battery shown.

[0025] Such as figure 1 as well as figure 2 As shown, the lithium ion secondary battery 1 has a structure in which a power generating element is housed in a battery container 2 having a square deep-drawn battery can 4 and a battery cover 3 that seals the opening 4 a of the battery can 4 . The power generation element has the electrode group 40 wound in a flat shape with separators 43 and 44 interposed between the positive electrode 41 and the negative electrode 42 . The electrode group 40 is inserted into the battery can 4 together with the positive electrode current collector plate 21 and the negative electrode current collector plate 31 with the outside thereof covered with an insulating sheet (not shown).

[0026] Both the battery can 4 and the battery cover 3 a...

no. 2 Embodiment approach

[0100] Next, use Figure 7 A second embodiment of the present invention will be described.

[0101] Figure 7 It is an enlarged cross-sectional view showing a main part of a quadrangular secondary battery according to the second embodiment. In addition, the same code|symbol is attached|subjected to the same component as 1st Embodiment, and the detailed description is abbreviate|omitted.

[0102] In the present embodiment, it is characterized in that the second insulator 65 is set to the engagement means of the battery cover 3 to be directly fixed only by caulking of the convex part 3b to the inside of the battery of the battery cover 3, and the second insulator 65 is removed. The shaft portion 61c of the positive terminal 61 is fixed by caulking.

[0103] In the first embodiment, as a method of fixing the second insulator 65 to the battery cover 3, a combination of directly fixing the shaft portion 61c of the positive terminal 61 and crimping the convex portion 3b to the in...

no. 3 Embodiment approach

[0109] Next, use Figure 8 A third embodiment of the present invention will be described.

[0110] Figure 8 It is an enlarged cross-sectional view showing a main part of a quadrangular secondary battery according to the third embodiment. In addition, the same code|symbol is attached|subjected to the same component as each above-mentioned embodiment, and the detailed description is abbreviate|omitted.

[0111] In the present embodiment, a case will be described in which the positive electrode side terminal structure portion 60 has a structure without the current interruption means.

[0112] The positive terminal 61 is composed of a flat plate portion 61 a and a shaft portion 69 (electrode terminal portion) as separate bodies. A bus bar (not shown) is connected to the upper surface of the flat plate portion (external terminal) 61 a , and a bus bar connection terminal (not shown) is fixed to a terminal bolt 63 . The flat plate portion 61 a forms an opening portion 61 d commu...

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PUM

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Abstract

The purpose of the present invention is to provide a rectangular secondary battery having increased rigidity against vibration and impact. This rectangular secondary battery (1) has a flat electrode group (40), a current collecting plate (21) which is electrically connected to the electrode group (40), a battery can (4) which houses the current collecting plate (21) and the electrode group (40), a battery lid (3) which closes the opening (4a) of the battery can (4), an electrode terminal (61) which is provided so as to penetrate through the battery lid (3) and which is connected to the current collecting plate (21) through a connection member, and a gasket (66) which is disposed between the electrode terminal (61) and the battery lid (3) and which insulates and seals between the electrode terminal (61) and the battery lid (3). An insulating body (65) is provided between the current collecting plate (21) and the battery lid (3). The battery lid (3) has a battery lid-side affixation section (3b) to which the insulating body (65) is affixed. The insulating body (65) has a current colleting plate-side affixation section (65c) to which the current collecting plate (21) is affixed.

Description

technical field [0001] The present invention relates to a quadrangular secondary battery used for vehicle applications and the like. Background technique [0002] Conventionally, in sealed lithium-ion secondary batteries installed in vehicles and other equipment, gas may accumulate inside due to overcharging, overheating, damage due to external force, etc., and the internal pressure of the gas battery may rise. Therefore, a vulnerable portion useful for safety is formed in the battery case of the sealed battery. [0003] For example, the following technologies have been proposed: using a part deformed by the internal pressure of the battery in a part of the battery case, the fragile part is broken due to the deformation of the part, and the current path is cut off by the breaking of the fragile part; The inside and outside of the battery exhaust gas. [0004] For example, in Patent Document 1, a structure is set in which the insulators are fitted to each other in a state w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M2/34H01M50/103H01M50/147H01M50/176H01M50/528H01M50/538H01M50/55H01M50/553H01M50/562H01M50/566
CPCH01M2/30H01M2/043H01M2220/20H01M2/263H01M10/0431H01M2/06H01M10/0587H01M2/22H01M50/147H01M50/528H01M50/538H01M50/553H01M50/562H01M50/176H01M50/566H01M50/103H01M50/55H01M10/0525Y02E60/10H01M50/15H01M50/578Y02P70/50H01M50/543H01M50/172H01M50/10H01M4/70H01M2200/20
Inventor 浦野和昭岩佐正明纲木拓郎松本洋
Owner 日本汽车能源株式会社
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