Consistency assessment method for single string of batteries in battery module
A battery module and consistency technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of system loss, inconsistent voltage, inconsistent product performance, etc., to avoid major losses and prevent large consistency deviations. Effect
Active Publication Date: 2019-10-01
SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD
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Problems solved by technology
[0002] In the production of power cells, due to the instability of the accuracy and purity of materials determined by the basic industry level, the performance of the final product is inconsistent; Parallel connection, connected together to form a module, the process in the process is inconsistent, such as the inconsistency of the welding process, it is very easy to cause the difference in welding resistance, which will inevitably lead to the inconsistency of the voltage between the single string batteries in the module
Due to the inconsistency of the voltage between the single-string batteries, the system may cause unexpected shutdown due to excessive pressure difference and cause major losses
Method used
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[0030] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.
[0031] The present invention proposes a method for evaluating the consistency of a single string of batteries in a battery module, such as figure 1 shown, including:
[0032] S1: Obtain the corresponding relationship between voltage and capacity of a normal battery at different temperatures to be tested;
[0033] S2: Obtain the voltage of each string of batteries in the battery module to be tested at different temperatures and capacities, and compare the voltage of each string of batteries in the battery module to be tested with the voltage of the normal battery at the same temperature and the same capacity By comparison, batteries with inconsistent correspondences are obtained, and it is judged as batteries with problems;
[0034] S3: Obtain the voltage drop of each string of b...
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The invention relates to the field of battery detection, in particular to a consistency assessment method for a single string of batteries in a battery module. The method comprises the following steps: S1, acquiring corresponding relationships between the voltages and capacities of a normal battery at different test temperatures; S2, acquiring the voltage of each string of batteries in a battery module to be tested at different temperatures and under different capacities, comparing the voltage of the each string of batteries in the battery module to be tested with the voltage of the normal battery at the same temperature and under the same capacity to obtain batteries with inconsistent corresponding relationships, and judging the batteries as defective batteries; and S3, acquiring the voltage drop of each string of batteries in the battery module at different discharging rates after discharging for the same time to obtain batteries with inconsistent corresponding relationships, and judging the batteries as defective batteries. Through adoption of the method, large consistency deviation among the batteries in the battery module is prevented, and important loss since the batteries cannot work due to inconsistency problem is avoided.
Description
technical field [0001] The invention relates to the field of battery detection, in particular to a method for evaluating the consistency of a single string of batteries in a battery module. Background technique [0002] In the production of power cells, due to the instability of the accuracy and purity of materials determined by the basic industry level, the performance of the final product is inconsistent; Parallel connection, connected together to form a module, inconsistency in the process of processing, such as inconsistency in the welding process, can easily cause differences in welding resistance, which will inevitably lead to inconsistencies in voltage between single strings of batteries in the module. Due to the inconsistency of voltage between single strings of batteries, the system may cause unexpected shutdown due to excessive pressure difference and cause major losses. Contents of the invention [0003] In order to solve the above problems, the present inventi...
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Login to View More IPC IPC(8): G01R31/385G01R31/396
CPCG01R31/385G01R31/396
Inventor 宋苏袁瑞臻彭密
Owner SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD