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Lithium-ion battery pack for vehicle power

A technology of lithium-ion battery packs and lithium-ion batteries, which is applied to batteries, secondary batteries, assembled battery machines, etc., can solve problems affecting the operation of battery packs, achieve good performance consistency, stable performance, and avoid life attenuation Effect

Active Publication Date: 2021-12-14
青岛恒金源电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a single cell is abnormal, it will affect the operation of the entire battery pack

Method used

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  • Lithium-ion battery pack for vehicle power
  • Lithium-ion battery pack for vehicle power

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Provide a lithium-ion battery to be formed, pulse charge the battery with a current of 0.05C until the charging cut-off voltage stops; the pulse time is 10min, the interval time is 120s, and the charging cut-off voltage is 4.35V;

[0029] 2) Discharging the battery with a current of 0.2C to the discharge cut-off voltage, the discharge cut-off voltage is 2.8V;

[0030] 3), repeat steps 1-2 3 times;

[0031] 4), static aging for 5 days;

[0032] 5) Pull out the electrolyte solution that is not immersed in the electrodes in the battery case, re-inject new electrolyte solution, and seal it. The new electrolyte solution includes 1.2mol / L lithium hexafluorophosphate and carbonic acid with a volume ratio of 1:2:1 Dimethyl ester, ethyl carbonate, non-aqueous solvent composed of ethyl methyl carbonate, and 5% fluorovinylene carbonate;

[0033] 6) Charge the battery with a current of 5C to a cut-off voltage of 4.35V, and then discharge the battery with a current of 5C to a c...

Embodiment 2

[0037] 1) Provide a lithium-ion battery to be formed, pulse charge the battery with a current of 0.02C until the charging cut-off voltage stops; the pulse time is 0.1min, the interval time is 30s, and the charging cut-off voltage is 4.2V;

[0038] 2), discharge the battery with a current of 0.05C to the discharge cut-off voltage, and the discharge cut-off voltage is 2.7V;

[0039] 3), repeat steps 1-2 0 times;

[0040] 4), static aging for 1 day;

[0041] 5) Pull out the electrolyte solution that is not immersed in the electrodes in the battery case, re-inject new electrolyte solution, and seal it. The new electrolyte solution includes 1.2mol / L lithium hexafluorophosphate and carbonic acid with a volume ratio of 1:2:1 Dimethyl ester, ethyl carbonate, non-aqueous solvent composed of ethyl methyl carbonate, and 5% fluorovinylene carbonate;

[0042] 6) Charge the battery with a current of 1C until the charging cut-off voltage is 4.2V, and then discharge the battery with a curre...

Embodiment 3

[0046] 1) Provide a lithium-ion battery to be formed, pulse charge the battery with a current of 0.03C, and charge the battery until the charging cut-off voltage stops; the pulse time is 2min, the interval time is 40s, and the charging cut-off voltage is 4.3V;

[0047] 2) Discharging the battery with a current of 0.1C to the discharge cut-off voltage, the discharge cut-off voltage is 2.75V;

[0048] 3), repeat steps 1-2 twice;

[0049] 4), static aging for 3 days;

[0050] 5) Pull out the electrolyte solution that is not immersed in the electrodes in the battery case, re-inject new electrolyte solution, and seal it. The new electrolyte solution includes 1.2mol / L lithium hexafluorophosphate and carbonic acid with a volume ratio of 1:2:1 Dimethyl ester, ethyl carbonate, non-aqueous solvent composed of ethyl methyl carbonate, and 5% fluorovinylene carbonate;

[0051] 6) Charge the battery with a current of 3C until the charging cut-off voltage is 4.25V, and then discharge the bat...

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PUM

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Abstract

The invention provides a power lithium-ion battery pack for vehicles, wherein the battery pack includes a plurality of battery modules, wherein the battery modules include a plurality of single cells; the battery pack also includes a controller, a battery module detection device, and a bypass device; when the battery module detection device detects that the parameters of the battery module are abnormal, the bypass device is activated to remove the battery module from the circuit of the battery pack; when the battery module detects that the parameters of the battery module return to the normal range, the bypass device is closed , move the battery module back to the circuit of the battery pack; the battery pack of the present invention can monitor the working state of the battery module and adjust it in time, so as to ensure the normal working state of the battery module and avoid life attenuation of the battery module due to abnormal charging and discharging.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a vehicle power lithium-ion battery pack. Background technique [0002] In order to meet the power and energy requirements of electric vehicles, the power batteries of electric vehicles must be used in groups. At the same time, due to the requirements for the layout and control of the battery pack, the battery cells are usually combined in series and parallel to form small battery modules, and then these battery modules are connected in series to meet the power requirements of the vehicle. At present, the battery packs used in electric vehicles are usually composed of multiple battery cells connected in parallel and in series. The series connection of multiple battery cells can increase the voltage at the output end of the battery pack. However, when a single cell is abnormal, it will affect the operation of the entire battery pack. Contents of the invention [0003] The inv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/44H01M10/058H01M10/48
CPCH01M10/0404H01M10/058H01M10/4207H01M10/4257H01M10/441H01M10/446H01M10/482H01M10/486H01M2220/20H01M2010/4271Y02E60/10Y02P70/50
Inventor 不公告发明人
Owner 青岛恒金源电子科技有限公司