Power lithium-ion battery with temperature equalizing connection function

Abstract

The invention relates to a power lithium-ion battery with a temperature equalizing connection function. The power lithium-ion battery comprises a battery cell which is provided with a battery anode connection portion and a battery cathode connection portion, the battery cell is covered with a heat equalizing material outside and is arranged inside a battery call casing, the heat equalizing material extends outside the battery call casing, and the heat equalizing material outside the battery call casing serves as a first outside connection portion. According to the power lithium-ion battery with the temperature equalizing connection function, the battery has a uniform temperature on the whole when used.

Description

Technical field [0001] The present invention relates to the technical field of lithium batteries, in particular to a power lithium battery with temperature equalization connection function. Background technique [0002] In all applications of the battery, the temperature consistency of each battery cell connected in parallel or in series will be very important. The temperature consistency will directly affect the consistency of the battery cell capacity; due to many occasions, especially pure electric In automotive applications, the battery is composed of more than hundreds of battery cells connected in series, and the charging process and discharging process are both applied in series. [0003] The battery cells connected in series constitute the high-voltage characteristics of the application system. For example, a pure electric bus has a rated voltage of 600VDC, and the system uses more than a few hundred cells to work in parallel and then in series. In order to ensure the cons...

AI Technical Summary

Problems solved by technology

When the temperature of the battery on a pure electric vehicle cannot be limited to an effective range, and the gradient of the temperature field cannot be limited to a small range (3 to 5 degrees), the application environment of the battery will become very poor. There will also be differences in capacity, and as a result, the operating mileage of pure electric vehicles cannot be guaranteed, the driving mileage after charging will become smaller, and the service life of the battery will also be shortened accordingly.

[0006] At present, all battery applications solve this problem through the external heat dissipation and heat soaking of the battery. Because the external method is used to solve the internal variation of the battery, the system will become more complicated and large. Sometimes feeling out of reach

The inventors of the present invention will find that, nowadays, in all pure electric vehicles, it is basically due to the problem of the battery that the driving range is unstable and the driving range is too short. Although people have adopted a lot of battery external solutions method, trying to make the battery work in a good temperature environment, so that the battery has a very small temperature gradient field, but in many occasions, the effect is often unsatisfactory

The essence of the problem is that all solutions are based on physical methods outside the battery to limit the temperature of the battery or establish a stable temperature field, so the effect will feel unsatisfactory or unstable

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