CN-121995218-A - Battery open-circuit voltage testing method and device and electronic equipment

CN121995218ACN 121995218 ACN121995218 ACN 121995218ACN-121995218-A

Abstract

The invention discloses a battery open-circuit voltage testing method, a device and electronic equipment, which belong to the technical field of batteries, and comprise the steps of placing a battery in a pretreatment area for temperature pretreatment so that the temperature of the battery approaches to a preset reference temperature, transferring the pretreated battery to a constant-temperature testing area, controlling the temperature of a tab of the battery so that the temperature of the tab is in a preset temperature range, synchronously collecting an open-circuit voltage value, an internal resistance value and a temperature value of the tab of the battery when the temperature of the tab is in the preset temperature range, inputting the collected open-circuit voltage value, the internal resistance value and the temperature value into a pre-calibrated compensation model, and calculating and outputting a final open-circuit voltage value subjected to temperature compensation by the compensation model. The invention achieves the technical effects of improving the test precision and stability in the test process of the open-circuit voltage of the battery and being beneficial to improving the reliability of the battery performance evaluation.

Inventors

FENG BAO
ZENG QINGYUAN
ZHAO XINGCHEN
XIANG BINGQIU
JIANG SEN

Assignees

广东瑞浦兰钧能源有限公司

Dates

Publication Date: 20260508
Application Date: 20260113

Claims (10)

1. The battery open-circuit voltage testing method is characterized by comprising the following steps of Placing a battery in a pretreatment area for temperature pretreatment so that the temperature of the battery approaches to a preset reference temperature; Transferring the pretreated battery to a constant temperature test area, and controlling the temperature of the tab of the battery so that the temperature of the tab is within a preset temperature range; When the temperature of the electrode lug is in a preset temperature range, synchronously collecting an open-circuit voltage value, an internal resistance value and a temperature value of the electrode lug of the battery; and inputting the acquired open-circuit voltage value, the internal resistance value and the temperature value into a pre-calibrated compensation model, calculating and outputting a final open-circuit voltage value subjected to temperature compensation by the compensation model.
2. The method of claim 1, wherein placing the battery in a pretreatment area for temperature pretreatment such that the temperature of the battery approaches a preset reference temperature comprises allowing the battery to approach the preset reference temperature by standing or slowly heating or cooling the battery.
3. The battery open circuit voltage testing method according to claim 1, wherein the preset reference temperature is 25 ± 1 ℃.
4. The method according to claim 1, wherein transferring the battery after the pretreatment to a constant temperature test area to control the temperature of the tab of the battery so that the temperature of the tab is within a preset temperature range comprises controlling the temperature of the tab of the battery by a semiconductor temperature control element so that the temperature of the tab is within the preset temperature range.
5. The method according to claim 4, wherein the preset temperature range is 25 ± 0.5 ℃.
6. The method for testing the open-circuit voltage of the battery according to claim 1, wherein the step of inputting the collected open-circuit voltage value, the internal resistance value and the temperature value into a pre-calibrated compensation model, the step of calculating and outputting a final open-circuit voltage value subjected to temperature compensation by the compensation model comprises the steps of measuring actual open-circuit voltage values of the battery of a specific model under a plurality of different temperature conditions in advance, the step of establishing a three-dimensional corresponding relation between the actual temperature, the actual internal resistance value and the actual open-circuit voltage deviation, the step of generating the compensation model through data fitting, and the step of calculating and outputting the final open-circuit voltage value subjected to compensation by the compensation model according to the input open-circuit voltage value, the internal resistance value and the temperature value.
7. The battery open circuit voltage testing method of claim 1, further comprising automatically sorting the batteries according to the final open circuit voltage value.
8. The battery open-circuit voltage testing device is characterized by comprising The pretreatment module is used for placing the battery in a pretreatment area for temperature pretreatment so that the temperature of the battery approaches to a preset reference temperature; the constant temperature test module is used for transferring the pretreated battery to a constant temperature test area and controlling the temperature of the tab of the battery so that the temperature of the tab is in a preset temperature range; The acquisition module is used for synchronously acquiring an open-circuit voltage value, an internal resistance value and a temperature value of the tab when the temperature of the tab is within a preset temperature range; The calculation module is used for inputting the acquired open-circuit voltage value, the internal resistance value and the temperature value into a pre-calibrated compensation model, calculating and outputting a final open-circuit voltage value subjected to temperature compensation through the compensation model.
9. The open circuit voltage testing apparatus according to claim 8, wherein the temperature control stage of the pre-processing module includes a heat conductive plate or a PTC heater for performing a temperature increasing or decreasing process on the battery.
10. An electronic device for battery open circuit voltage testing, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the program, performs the steps of: placing a battery in a pretreatment area for temperature pretreatment so that the temperature of the battery approaches to a preset reference temperature; Transferring the pretreated battery to a constant temperature test area, and controlling the temperature of the tab of the battery so that the temperature of the tab is within a preset temperature range; When the temperature of the electrode lug is in a preset temperature range, synchronously collecting an open-circuit voltage value, an internal resistance value and a temperature value of the electrode lug of the battery; and inputting the acquired open-circuit voltage value, the internal resistance value and the temperature value into a pre-calibrated compensation model, calculating and outputting a final open-circuit voltage value subjected to temperature compensation by the compensation model.

Description

Battery open-circuit voltage testing method and device and electronic equipment Technical Field The invention belongs to the technical field of batteries, and particularly relates to a battery open-circuit voltage testing method and device and electronic equipment. Background In the production and manufacturing process of the battery, the open circuit voltage is a key parameter for representing the state of the battery cell, screening the self-discharge performance and evaluating the quality of the product. In the production process, the placing and testing of the battery cells are generally carried out in an open environment, so that the testing temperature can be fluctuated, the open-circuit voltage testing of the battery is obviously influenced, and the judgment of the performance of the battery cells is influenced. In the prior art, test equipment is usually placed in a constant temperature workshop, the influence of temperature fluctuation on a test result is reduced by controlling the temperature of the whole environment, but the cost is high, and even in the constant temperature workshop, the temperature between points can have large difference due to wide distribution of test points, so that the test result is inconsistent. Therefore, a new solution is needed to solve the above technical problems. Disclosure of Invention The invention aims to solve the technical problems that the test precision and stability are poor in the battery open-circuit voltage test process, and the reliability of battery performance evaluation is difficult to improve. The invention provides a battery open-circuit voltage testing method, which comprises the steps of placing a battery in a pretreatment area for temperature pretreatment so that the temperature of the battery approaches to a preset reference temperature, transferring the pretreated battery to a constant-temperature testing area, controlling the temperature of a tab of the battery so that the temperature of the tab is in a preset temperature range, synchronously collecting an open-circuit voltage value, an internal resistance value and a temperature value of the tab of the battery when the temperature of the tab is in the preset temperature range, inputting the collected open-circuit voltage value, the internal resistance value and the temperature value into a pre-calibrated compensation model, and calculating and outputting a final open-circuit voltage value subjected to temperature compensation by the compensation model. Optionally, the placing the battery in a pretreatment area for temperature pretreatment, so that the temperature of the battery approaches to a preset reference temperature includes placing the battery in a standing or slow heating or cooling mode, so that the temperature of the battery approaches to the preset reference temperature. Optionally, the preset reference temperature is 25±1 ℃. Optionally, the transferring the pretreated battery to a constant temperature test area, and controlling the temperature of the tab of the battery, so that the temperature of the tab is within a preset temperature range, includes controlling the temperature of the tab of the battery by a semiconductor temperature control element, so that the temperature of the tab is within the preset temperature range. Optionally, the preset temperature range is 25 ℃ ± 0.5 ℃. Optionally, inputting the collected open-circuit voltage value, the internal resistance value and the temperature value into a pre-calibrated compensation model, calculating and outputting a final open-circuit voltage value subjected to temperature compensation by the compensation model, wherein the final open-circuit voltage value comprises an actual open-circuit voltage value of a battery of a specific model measured under a plurality of different temperature conditions in advance, establishing a three-dimensional corresponding relation between the actual temperature, the actual internal resistance value and the actual open-circuit voltage deviation, generating the compensation model through data fitting, and calculating and outputting the final open-circuit voltage value subjected to compensation by the compensation model according to the input open-circuit voltage value, the internal resistance value and the temperature value. Optionally, the battery open circuit voltage testing method further comprises automatically sorting the batteries according to the final open circuit voltage value. According to still another aspect of the present invention, there is provided a battery open-circuit voltage testing apparatus, including a preprocessing module configured to place a battery in a preprocessing area to perform temperature preprocessing so that the temperature of the battery approaches a preset reference temperature, a constant temperature testing module configured to transfer the battery after the preprocessing to the constant temperature testing area, to control the temperature of a tab of the batt