Lithium battery module connection structure having self-protection function and connection method of lithium battery module connection structure

Abstract

The invention relates to a lithium battery module connection structure having a self-protection function and a connection method of the lithium battery module connection structure. The lithium battery module connection structure comprises a plurality of battery modules, wherein the plurality of battery modules are connected in series by conductive structures, each conductive structure comprises a first conductive copper bar and a second conductive copper bar, one end of the first conductive copper bar is connected with one end of the second conductive copper bar by a fusible metal block, and the other ends of the first conductive copper bar and the second conductive copper bar are respectively connected with conductive blocks on adjacent battery modules. By the fusible metal with relatively low melting point, the fusible metal and the two copper bars are connected in series by means of physical characteristics and then are used for connecting the battery modules in series to achieve a current diversion effect, the fusible metal can be rapidly fused under a high-temperature uncontrollable risk environment, connection among the modules is broken to achieve the self-protection effect, and the problem of high-temperature out-of-control during over-charge, misuse and cycle usage process of various lithium ion battery modules such as a ternary material and a lithium iron phosphate material in the market is solved.

Description

technical field [0001] The invention relates to the technical field of lithium battery manufacturing, in particular to a lithium battery module connection structure and a connection method with a self-protection function. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, high output power, long charge and discharge life, no pollution, wide operating temperature range and small self-discharge. As a new type of high-energy chemical power source, lithium-ion batteries have been widely used in electric vehicles and energy storage fields in recent years. At present, because the battery life of electric vehicles is generally not too high, a large number of lithium-ion batteries need to be connected in series or in parallel to improve the battery life of the battery module. [0003] In the field of energy storage, a battery module obtained by connecting a large number of lithium-ion batteries in series and parallel is used as an ...

AI Technical Summary

Problems solved by technology

[0004] In order to improve the energy density of lithium-ion batteries and achieve high battery life, high storage capacity often needs to be realized by connecting multiple battery modules in series and parallel at the same time, but at this time it is difficult to guarantee the safety performance of the battery modules in the process of charging and discharging.

At present, the series-parallel connection between lithium battery modules in the market is directly connected by conductive metal. When some uncontrollable problems occur between the modules, there is no self-protection module function or method. In the battery module composed of multiple battery modules, if a single battery or module has an abnormal problem, it will have a series of chain reactions on the entire module, which will cause the seriousness of the problem of out-of-control expansion.

Images