Method and device for evaluating state of health of power battery

A power battery and state of health technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as only considering capacity factors

Inactive Publication Date: 2018-10-19
上海科列新能源技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that only the capacity factor is considered, and the internal resistance, pressure difference and other factors that have an important impact on the performance of electric vehicles are not considered.

Method used

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  • Method and device for evaluating state of health of power battery
  • Method and device for evaluating state of health of power battery
  • Method and device for evaluating state of health of power battery

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Embodiment Construction

[0052] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] refer to figure 1 , which shows a flow chart of the steps of an embodiment of a method for evaluating the state of health of a power battery according to the present invention, which may specifically include the following steps:

[0054] Step 101, acquiring historical data of the power battery;

[0055] In the embodiment of the present invention, historical data may include data such as voltage, current, temperature, state of charge, state of health, power state, alarm information, capacity, internal resistance, pressure difference, and self-discharge of the power battery during service. In practical applications, the historical data can be collected by the battery management system, and the collected data can be stored in...

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Abstract

The embodiment of the present invention provide a method and device for evaluating the state of health (SOH) of a power battery, the method comprising: acquiring the historical data of the power battery; calculating the capacity, the internal resistance, the charging cutoff individual voltage difference, and the constant-current charging cutoff individual voltage difference of the power battery based on the historical data; calculating the capacity SOH of the power battery by the capacity, calculating the internal resistance SOH of the power battery by the internal resistance, calculating thecharging cutoff individual voltage difference SOH of the power battery by using the charging cutoff individual voltage difference, and calculating the constant-current charging cutoff individual voltage difference SOH of the power battery by the constant-current charging cutoff individual voltage difference; according to the capacity SOH, the internal resistance SOH, the charging cutoff individualvoltage difference SOH, and the constant-current charging cutoff individual voltage difference SOH, determining the SOH of the power battery. The method and device can evaluate the SOH of the power battery accurately and quickly at low cost.

Description

technical field [0001] The invention relates to the technical field of storage batteries, in particular to a method for evaluating the state of health of a power battery and a device for evaluating the state of health of a power battery. Background technique [0002] The power battery is the energy carrier of electric vehicles. How to accurately evaluate the state of health (SOH, state of health) of the power battery is a key technology in the field of power batteries, especially the accurate evaluation relationship of the SOH of the power battery in service and the power battery that has been decommissioned. To security of electric car and security of step use. [0003] In the current technology, there are several ways to evaluate the health status of the power battery: [0004] 1. Charge the battery pack in the discharge cut-off state to the full charge state, calculate the maximum available capacity of the battery pack according to the available capacity of the battery p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3648
Inventor 鲍剑明孙艳聂佳
Owner 上海科列新能源技术有限公司
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