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A vehicle power battery module

A technology for power batteries and power battery packs, which is applied in battery electrodes, secondary battery repair/maintenance, secondary battery charging/discharging, etc., and can solve the problem of aggravated electrolyte side reactions, battery damage, and affecting battery safety cycle performance, etc. question

Inactive Publication Date: 2011-11-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a high current has a strong impact on the battery module, and the damage to the battery is also relatively serious. The common problem is: the side reaction of the electrolyte is aggravated or the negative electrode produces lithium dendrites, which will seriously affect the safe use and cycle performance of the battery.

Method used

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  • A vehicle power battery module
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Examples

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preparation example Construction

[0033] The preparation method of the single battery of the present invention is carried out according to the methods known to those skilled in the art. Generally speaking, the method includes sequentially winding the positive electrode, the negative electrode and the separator between the positive electrode and the negative electrode to form a pole core, and the pole core Putting it into a battery case, adding electrolyte, and then sealing, wherein the negative electrode includes a current collector and a negative active material loaded on the current collector, wherein the negative active material is the negative active material provided by the present invention. Among them, the methods of winding and sealing are well known to those skilled in the art. The amount of electrolyte used is conventional.

[0034] Single cells with different polarization internal resistances were prepared by selecting different positive and negative electrode materials, particle sizes of materials,...

Embodiment 1

[0041] Take 10 power single batteries a in series to form a power battery pack A, take 14 pulse buffer single batteries b in series to form a pulse buffer battery pack B, and connect the power battery pack A and pulse buffer battery pack B in parallel to form a battery module AB.

Embodiment 2

[0043] Take 10 power single batteries a in series to form a power battery pack A, take 14 pulse buffer single batteries c in series to form a pulse buffer battery pack C, and connect the power battery pack A and pulse buffer battery pack C in parallel to form a battery module AC.

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Abstract

The invention belongs to the field of battery modules, and specifically discloses a vehicle-mounted power battery module. The on-vehicle power battery module includes a power battery pack, which is composed of several power single cells connected in series; it also includes a pulse buffer battery pack connected in parallel with the power battery pack, and the pulse buffer battery pack is composed of several pulse buffer single cells connected in series; The voltage at both ends of the battery pack is equal to the voltage at both ends of the pulse buffer battery pack, and the ratio of the polarization internal resistance of the power single battery to the polarization internal resistance of the pulse buffer single battery is 1:0.5-1:0.1. The vehicle-mounted power battery module of the present invention can effectively resist the damage caused by the braking pulse current; after the impact of the pulse current, it can effectively maintain the cycle performance and safety performance of the vehicle-mounted power battery module.

Description

technical field [0001] The present invention relates to a battery module, and more particularly relates to a vehicle-mounted power battery module. Background technique [0002] In recent years, with the impact of the oil crisis and high-level requirements for environmental protection, hybrid vehicles and pure electric vehicles have become the main development trend of automobiles. As the most important source of power for hybrid electric vehicles and pure electric vehicles—vehicle power battery module is also the focus of research. [0003] The braking method of hybrid vehicles and pure electric vehicles is different from that of traditional fuel vehicles. The braking method of fuel vehicles is mechanical brakes. This method of brake wear is serious, and a large amount of heat is generated, which will lead to thermal fading. The braking method of hybrid electric vehicles and pure electric vehicles is regenerative braking, which feeds back the energy generated during braking...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/44H01M4/136
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 陶峰潘福中沈晞
Owner BYD CO LTD
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