Battery internal resistance detecting method and detecting device

A battery internal resistance and detection method technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc.

Inactive Publication Date: 2018-06-29
HENAN AEROSPACE HYDRAULIC & PNEUMATIC TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In addition, the current BMS calculates the remaining mileage and battery power are estimated

Method used

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  • Battery internal resistance detecting method and detecting device
  • Battery internal resistance detecting method and detecting device
  • Battery internal resistance detecting method and detecting device

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Embodiment Construction

[0017] Example of battery internal resistance detection device

[0018] First, briefly explain the basic principle of battery internal resistance detection, such as figure 1 As shown, the specific implementation method is as follows: connect the variable resistor as the load of the battery and adjust the resistance value so that the ammeter reads at a certain value to record the voltage reading, adjust the variable resistor again to increase the current to another value, and then record for the second time The voltage reading, and then dividing the voltage drop difference between the two voltages by the change value of the two currents is the internal resistance of the battery. For example: Suppose a battery is charged to "1.5V", the first step is to connect the battery to a variable resistor, and then adjust the variable resistor so that the current reading is "2A". At this time, the voltage indicated by the voltmeter is different Decrease, record the reading at this time, i...

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Abstract

The invention relates to a battery internal resistance detecting method and a battery internal resistance detecting device. The battery internal resistance detecting method adopts a master-slave structure, and measures a current and a voltage separately. The battery internal resistance detecting method comprises the steps of: for a certain acquisition moment, recording a current value and a voltage value of a battery which are acquired at the acquisition moment as a first current value and a first voltage value; then calculating a difference value between a current value acquired at each acquisition moment every time an acquisition moment arrives until a difference value greater than or equal to a set threshold value appears, recording the difference value as a current difference value, and recording a voltage value acquired at the acquisition moment corresponding to the current difference value as a second voltage value; calculating a difference value between the second voltage valueand the first voltage value, and recording the difference value as a voltage difference value; and then calculating a specific value of the voltage difference value and the current difference value toobtain battery internal resistance in the period of time. Through the above detection process, an internal resistance value of the battery can be obtained precisely, further the health assessment andexpected cycle life estimation of the battery can be completed according to the internal resistance, and the data can be utilized to complete echelon utilization pairing.

Description

technical field [0001] The invention relates to a battery internal resistance detection method and a detection device, belonging to the technical field of battery internal resistance detection. Background technique [0002] In the process of using power batteries in industrial fields such as new energy vehicles, the characteristics and differences between different batteries are very large, and there are even differences between different batches of the same battery. Due to the large number of batteries required in the battery pack, these differences will be accumulated and magnified, resulting in imbalance, which will have a great impact on the safety and performance of the entire battery pack. The direct reason for the safety and performance of battery cells is the increase of dynamic internal resistance. Therefore, the dynamic internal resistance of power batteries will be an important parameter for evaluating the safety and performance of battery packs in the future, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3842
Inventor 张珅芦加喜胡浩孙先海赵光裕陈然魏华生吴利伟侯云陈凯
Owner HENAN AEROSPACE HYDRAULIC & PNEUMATIC TECH
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