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Grouping alternating current preheating method of a battery pack

A technology for battery packs and batteries, which is applied in secondary batteries, battery temperature control, secondary battery repair/maintenance, etc., can solve the problems of low battery pack warm-up efficiency and difficulty in meeting large currents, and achieve improved energy utilization efficiency, Improve the warm-up rate and ensure the effect of performance

Active Publication Date: 2019-01-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is to solve the problem that the large current is difficult to meet when preheating the whole battery pack and the battery pack preheating efficiency is low when using external preheating, and proposes a battery pack AC preheating method

Method used

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  • Grouping alternating current preheating method of a battery pack
  • Grouping alternating current preheating method of a battery pack
  • Grouping alternating current preheating method of a battery pack

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Embodiment Construction

[0019] The present invention proposes a group AC preheating method for battery packs. The present invention will be further described in detail below in conjunction with the accompanying drawings and specific examples of the invention.

[0020] The present invention proposes a battery group AC preheating method, the overall flow chart is as follows figure 1 shown, including the following steps:

[0021] (1) Select a battery pack, which can be any type of battery pack, group the battery pack with a battery cell or a module, and use a circuit with a switching device to connect each battery pack with the battery pack The charging interface is connected to pair all the battery groups, and the two groups in each pair are connected by a circuit with the function of controlling the mutual charging and discharging of the groups. Specific steps are as follows:

[0022] (1-1) Select a battery pack and group the battery pack with cells or modules as units. The battery cells or battery ...

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PUM

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Abstract

The invention provides a grouping alternating current preheating method of a battery pack, belonging to the technical field of batteries. At first, that battery pack is grouped by the battery cell ormodule as a unit, each battery pack is connected with a battery pack char interface by a circuit with a switch device, all battery packs are paired, and two pairs in each pair are connected by a control circuit; If the battery pack is in a low temperature environment, a judgment is made as to whether the battery pack charging interface is connected with an external power supply, and the battery pack is preheated according to the judgement result. The invention can be implemented under the condition of having an external power input and no external power input at the same time, and can effectively improve the preheating rate of the battery pack and the energy use efficiency when preheating.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an alternating current preheating method for battery pack groups. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge rate, and no memory effect. Compared with other batteries, they are currently the most suitable power source for electric vehicles. However, under low temperature conditions (generally below 0°C), the various impedances inside the lithium-ion battery increase, resulting in a decrease in its performance during use, and the current commercial lithium-ion battery negative electrode material is mainly graphite, which can be charged at low temperature Sometimes it is easy to cause lithium metal to appear on the graphite negative electrode, which makes the capacity of the battery decay and the lifespan is reduced, and the continuous growth of lithium metal may also puncture the diaphragm, ...

Claims

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Application Information

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IPC IPC(8): H01M10/615H01M10/635H01M10/48H01M10/42H01M10/0525
CPCH01M10/0525H01M10/4207H01M10/425H01M10/486H01M10/615H01M10/63H01M2010/4271Y02E60/10
Inventor 张剑波李哲方儒卿葛昊
Owner TSINGHUA UNIV
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