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A method for setting power battery voltage protection

A power battery and voltage protection technology, which is applied in battery circuit devices, emergency protection circuit devices, secondary battery repair/maintenance, etc., can solve problems such as power battery life and safety impact, and achieve the effect of eliminating test errors

Inactive Publication Date: 2019-02-19
江西优特汽车技术有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The BMS voltage protection in the prior art usually directly compares the detected voltage value with the set value, and the detection accuracy is usually 10mV or even lower, which makes the battery bear the risk of 10mV overcharge, overdischarge and overcurrent, and the simple If the test error of the battery management system reaches 20mV or even 50mV, it will have a huge impact on the life and safety of the power battery

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  • A method for setting power battery voltage protection

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Embodiment Construction

[0018] The setting method of the voltage protection of the power lithium battery of the present invention can prevent the power battery from being overcharged, over-discharged and over-current due to the deviation of the voltage detection. The specific setting method is as follows:

[0019] Step 1. Make target power battery 100mAh or other small capacity samples.

[0020] Step 2. Use high-precision testing equipment to measure the relationship between the cycle life of the sample and the cut-off voltage.

[0021] Step 3: Select 0% SOC voltage, 100% SOC voltage and equal voltage protection thresholds according to the measurement results and the battery protection cycle life target.

[0022] Step 4: Select the battery management system BMS, including a voltage detection module, a communication module and a management module.

[0023] Step 5: Calibrate the voltage detection accuracy of the battery management system.

[0024] Step 6. The 100% SOC voltage minus the maximum error ...

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Abstract

The invention discloses a method for setting power battery voltage protection. The method includes 1) testing to obtain a relation between the cycle life of a power battery and a cutoff voltage; 2) selecting protection threshold values of 0% SOC voltage and 100% SOC voltage of the power battery according to the relation between the cycle life and the cutoff voltage which is obtained by testing anda cycle life target of battery protection; 3) calibrating voltage detection precision of a battery management system; and 4) obtaining an error of the battery management system according to the voltage detection precision, and adjusting the set threshold values of the battery management system according to the error. The method for setting power battery voltage protection has the advantage that influence of each voltage threshold value on the life of the power battery is fully measured, and influence of the test error of the battery management system itself on voltage protection is eliminated, the set protection objective of the battery is achieved, and the capacity and performance of the battery are fully exerted.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to the power battery technology of electric vehicles. Background technique [0002] Pure electric vehicles, as well as hybrid vehicles, use power batteries as the power source to output or recycle electric energy under the condition of motor drive or power generation. In the long-term choice, lithium batteries have become the mainstream. Due to the characteristics of the lithium battery itself, the normal use range is strictly limited. Exceeding the voltage range, temperature range, and current range will seriously damage the lithium battery. Therefore, lithium power batteries are often used in conjunction with the management system BMS (Battery Management System). [0003] During the use of the power battery, the charging and discharging end point of normal use, the maximum power that can be sustained in the high-power scene of accelerated climbing and electric energy recovery (su...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/18H02H1/00H01M10/42
CPCH01M10/4257H01M2010/4271H02H1/0007H02H7/18Y02E60/10
Inventor 李世明王世强胡庆军
Owner 江西优特汽车技术有限公司