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Cap assembly for secondary battery and secondary battery

A technology of secondary battery and cover assembly, applied in the direction of secondary battery, battery pack parts, battery cover/end cover, etc., can solve the problem of secondary battery explosion, etc., and achieve the effect of preventing explosion and slowing down the speed of thermal runaway.

Active Publication Date: 2022-01-28
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the existing air pressure control type explosion-proof valve is thermally out of control, there is a risk that the secondary battery will explode before the pressure is released.

Method used

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  • Cap assembly for secondary battery and secondary battery
  • Cap assembly for secondary battery and secondary battery
  • Cap assembly for secondary battery and secondary battery

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Embodiment Construction

[0091] The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0092] Terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of this application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0093] It should be understood that the term "and / or" used herein is only an association relationship describing associated objects, which me...

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Abstract

The present application relates to the technical field of energy storage devices, in particular to a cover assembly of a secondary battery and the secondary battery. The cover assembly includes: a cover plate with a vent hole; an exhaust valve blocked in the vent hole, and the vent valve is configured to deform in response to an increase in temperature so as to leave the state of blocking the vent hole; a protective component, at least Partially covering the vent holes, the gas permeability coefficient of the protective part is smaller than that of the exhaust valve. The cover assembly of the secondary battery provided by the present application and the secondary battery block the vent holes through the exhaust valve, and the vent valve is set to deform in response to the increase of temperature, so as to break away from the state of blocking the vent holes, When the internal temperature of the battery casing rises, the gas in the casing can be discharged through the vent holes, thereby reducing the risk of thermal runaway of the secondary battery and slowing down the speed of thermal runaway of the secondary battery, providing passengers with sufficient The escape time is improved, and the anti-penetration performance is improved by the protective part.

Description

technical field [0001] The present application relates to the technical field of energy storage devices, in particular to a cover assembly of a secondary battery and the secondary battery. Background technique [0002] As an important part of new energy vehicles, secondary batteries have extremely important safety performance. As the secondary battery is charged and discharged, gas will be generated inside the secondary battery, and excessive gas pressure may cause the secondary battery to explode. Therefore, an air pressure control type explosion-proof valve can be installed on the cover plate of the secondary battery. [0003] Since the capacity or power of one secondary battery is relatively small, multiple secondary batteries are often required to be arranged to form a battery module. Once a secondary battery in the battery module undergoes thermal runaway, the heat generated will be quickly transferred to other secondary batteries in the battery module, and other secon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/147H01M50/30H01M50/186H01M10/613H01M10/625H01M10/647H01M10/6556
CPCH01M10/613H01M10/625H01M10/647H01M10/6556H01M2220/20H01M2200/10H01M2200/20H01M50/147H01M50/148H01M50/15H01M50/183H01M50/383H01M50/394H01M50/375Y02E60/10H01M50/3425H01M50/342H01M50/325H01M50/184H01M50/155H01M50/358
Inventor 李全坤张诗尧王鹏
Owner CONTEMPORARY AMPEREX TECH CO
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