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Battery, vehicle and apparatus mounting battery

By designing the structure of the external terminals and closing cover in the lithium-ion secondary battery and using fragile parts to cut off the current path, the problem of ineffective space and difficulty in cutting off the internal pressure in the sealed battery is solved, and the impact resistance and vibration resistance of the battery are improved. sex, ensuring safety and sealing.

Active Publication Date: 2011-03-02
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the internal pressure rises, the diaphragm deforms and the fragile part breaks

Method used

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Embodiment Construction

[0045] Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings. In this form, the current cutoff mechanism of the present invention is applied to the vicinity of the electrode terminals of the lithium ion secondary battery.

[0046] The secondary battery 10 of this mode is as figure 1 As shown, positive and negative electrode terminals 14 and 15 are provided on the outside of a flat battery case 11 . Furthermore, a power generating element 16 is housed and sealed inside the battery case 11 . The battery case 11 has a box-shaped main body 13 with one side open, and a sealing plate 12 that closes the opening. The positive terminal 14 and the negative terminal 15 are respectively connected to positive and negative electrode plates included in the power generating element 16 . Furthermore, a safety valve 18 is formed at a position between both terminals 14 and 15 in the battery case 11 . The safe...

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Abstract

Disclosed is a battery provided with a current interruption mechanism (20). The current interruption mechanism (20) is provided with thick portions (48, 49) and a fragile portion (45) in an external terminal (21) connecting an electrode terminal with a terminal rivet (31) to be connected with a power generation element (16), wherein the thick portions (48, 49) are connected with each other only through the fragile portion (45). Furthermore, the current interruption mechanism (20) comprises: the terminal rivet (31) which penetrates a sealing plate (12), has a portion thereof on the outside of a battery case (11) arranged to be in close contact with the thick portion (48) of the external terminal (21) and cover the same, and is provided with a through hole (32), which is a part of the battery case (11); and a sealing cap (25) which covers the outlet of the through hole (32) on the outside of the battery case (11) and is bonded to the external terminal (21) over the entire circumference of the through hole (32) or bonded across the external terminal (21) and the terminal rivet (31). When the internal pressure of the battery case (11) rises, at least a portion of the sealing cap (25) moves to recede from the battery case (11), so that a portion of the external terminal (21) deforms to thereby destroy the fragile portion (45).

Description

technical field [0001] The present invention relates to a sealed battery such as a lithium ion secondary battery, and a vehicle and equipment equipped with the battery. More specifically, it relates to a battery that cuts off current by breaking an electrical path when the internal pressure rises, and a vehicle and equipment equipped with the battery. Background technique [0002] Conventionally, in a sealed battery such as a lithium ion secondary battery mounted on a vehicle or other equipment, gas may accumulate inside due to overcharging, excessive temperature rise, damage due to external force, or the like. Furthermore, the internal pressure of the battery may rise due to this gas. Therefore, the battery case of the sealed battery is generally formed with a vulnerable portion for safety reasons. For example, a part of the battery case that is deformed by the internal pressure of the battery is used, and the fragile portion is damaged due to the deformation of the membe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/34H01M50/176H01M50/528H01M50/55H01M50/553H01M50/574
CPCH01M2/34H01M10/0525H01M2/30H01M2/345H01M2/1241Y02T10/7011H01M2/22Y02E60/10H01M50/3425H01M50/528H01M50/578H01M50/55H01M50/553H01M50/574H01M50/176H01M50/572Y02T10/70
Owner TOYOTA JIDOSHA KK
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