Power battery of new energy automobile

Abstract

The invention discloses a power battery of a new energy automobile. The power battery comprises a shell, multiple flexibly-packaged batteries arranged in the shell and insulating liquid-absorbing gaskets arranged between adjacent two flexibly-packaged batteries; and each flexibly-packaged battery comprises a thermal packaging film and a single cell packaged in the thermal packaging film. The power battery of the new energy automobile can satisfy volume change requirement of a battery electrode sheet and also can perform module assembling conveniently as a hard-shell battery, and combines the characteristic of long service life of a flexibly-packaged battery, the advantage of easy module assembling of the hard-shell battery and high safety; in addition, the flexibly-packaged battery cells are matched and loaded into the shell, so that the consistency of the power battery is greatly improved; and furthermore, the insulating liquid-absorbing gaskets are wide in absorbable liquid selection range, so that it is beneficial to management and design of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular, the invention relates to a power battery of a new energy vehicle. Background technique [0002] With the increasing promotion of new energy vehicles in various countries around the world, the sales of fuel vehicles will be gradually banned from 2025 to 2030, and the technological progress of power batteries has been highly valued. Among all kinds of power batteries, lithium-ion batteries have become the mainstream choice of power batteries due to their far-leading energy density. Power batteries in the prior art mainly contain three types, cylindrical, square hard shell and soft pack batteries. During the charging and discharging process of the single cell of the power battery, both the positive pole piece and the negative pole piece are expanding and shrinking, and with the pulverization of the active material particles, the SEI film on the surface of the pole piece...

AI Technical Summary

Problems solved by technology

Such a large volume change cannot eliminate its negative effects in a tightly wound cylindrical battery. The most obvious is that the cycle life of the battery is difficult to achieve greater than 1000 times

In the square hard shell battery, it will also cause the battery shell to bulge, which will still affect the life of the battery and other performance improvements.

Although the soft-pack battery can make the volume change more freely, if the cushioning of the soft-pack power battery is not done well, the volume change of the battery pole piece will be limited. If the fixation of the soft-pack power battery is not done well, it will Will be damaged during the vibration process, it is difficult to have both

For a bulging power battery, in most cases the plate will be severely deformed, not only the failure of the power battery system, but also the short circuit of the battery, which is very dangerous for users

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