A hard case lithium ion battery

Abstract

The present invention belongs to the technical field of lithium ion battery, and particularly relates to a hard shell lithium ion battery with high safety performance, wherein the hard shell lithium ion battery comprises an electrical core and a shell accommodating the electrical core, the front end of the electrical core is provided with a positive electrode lug and a negative electrode lug, the shell comprises a shell main body and a top cover, the top cover is provided with a positive terminal, a negative terminal, an explosion-proof valve and a liquid injection hole, and an insulating shell is provided between the electrical core and the shell. Compared to the prior art, the hard shell lithium ion battery of the present invention has the following advantages that: during the normal use process of the electrical core, the effective insulating protection from the shell can be provided, such that the generation of positive-negative short circuit can be avoided during the series parallel connection use of the electrical core due to shell contacting; when the internal short-circuit of the electrical core is generated due to unexpected situations or the internal short-circuit is directly generated, the contact of the electrical core shell and the electrical core can be effectively prevented, and the occurrence of melt-through phenomenon of the shell due to the positive-negative electrode short circuit can be prevented so as to substantially improve the safety performance of the hard shell lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a hard-shell lithium-ion battery with high safety performance. Background technique [0002] Lithium-ion batteries have been widely used in various fields due to their high energy density, high voltage, low self-discharge and light weight. In recent years, lithium-ion batteries have also been gradually promoted and applied in fields such as electric tools and power vehicles. In contrast, lithium-ion batteries used in power tools and power vehicles have the characteristics of larger cells and higher energy density. Therefore, both in design and in application, higher requirements are put forward for the safety performance of lithium-ion batteries. [0003] Such as figure 1 As shown, the hard shell lithium-ion battery is generally composed of at least one wound battery cell 1 or several sequentially stacked battery cells 1 and a metal casing 2 that wraps the batter...

AI Technical Summary

Problems solved by technology

[0004] The current hard-shell lithium-ion batteries have certain safety hazards during use: in the series-parallel application of the battery, when the shells of two adjacent battery cells are in contact, the conduction of the shell will short-circuit the positive and negative electrodes of the battery , and then lead to battery overheating, fire, explosion and other safety accidents

like figure 1 As shown, during the abuse of the battery, due to adverse factors such as high temperature, high pressure, corrosion, etc., the battery cell 1 will pass through the metal casing 2 to cause a short circuit between the positive and negative poles.

During this process, the resistance of the contact point 23 between the battery cell 1 and the metal casing 2 is the largest, causing the temperature of the contact point 23 to rise sharply, eventually causing the metal casing 2 to be burned through, and the combustible gas and high temperature points inside the battery cell 1 The coexistence of external oxygen and external oxygen will cause the battery to burn

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