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Parallel grouping screening method for single batteries

A single battery and screening method technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of screening failure, screening, and many screening features, and achieve stable consistency, high consistency, and stability and good dynamic performance

Active Publication Date: 2020-11-20
深蓝汽车科技有限公司
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Problems solved by technology

The existing methods for group screening of single cells have the following problems: (1) The characteristic quantity of single cell screening is relatively rough. Different feature quantities are screened differently, resulting in problems such as too strict screening requirements for single batteries or screening failure; (2) There are many choices for screening feature quantities, and the rationality and consistency of single battery screening into groups are not high

Method used

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  • Parallel grouping screening method for single batteries

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Embodiment Construction

[0019] Such as figure 1 The parallel group screening method of the single cells shown includes:

[0020] Step 1. Determine the actual capacity and DC internal resistance of all single batteries under normal temperature environment and low temperature environment

[0021] Under the environment of 25°C, conduct a constant current discharge test on all the single batteries in the first fully charged state with a current of 1 / 3C, and obtain the actual capacity Q of each single battery under the environment of 25°C; among them, the first fully charged state A single battery refers to a single battery that is fully charged with a constant current of 1 / 3C at 25°C and left to stand for 4 hours at 25°C.

[0022] Under the environment of 25°C, discharge all the single cells in the first fully charged state with a constant current of 1 / 3C. During the constant current discharge process, when the SOC of the single cells is 90%, 60%, and 10% Add 1C current to conduct 10-second pulse disch...

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Abstract

The invention discloses a parallel grouping screening method for single batteries. The method comprises the following steps: determining actual capacities and direct-current internal resistances of all single batteries in a normal-temperature environment and a low-temperature environment, determining a capacity threshold range and an internal resistance threshold range of the single batteries in the normal-temperature environment and the low-temperature environment, and screening the single batteries meeting screening conditions into one group. The plurality of single batteries screened into one group can be connected in parallel to form the battery pack, so that the consistency among the single batteries in the battery pack is higher, and the performance of the battery pack is improved.

Description

technical field [0001] The invention belongs to the field of battery systems of new energy vehicles, and in particular relates to a parallel group screening method of single batteries. Background technique [0002] With the characteristics of "electrification and zero emission", electric vehicles have become the main development direction of the new energy vehicle industry. In order to ensure the healthy development of the electric vehicle industry, the application of power batteries has attracted more and more attention. In order to meet the power and endurance requirements of automobiles, it is usually necessary to connect multiple single batteries in series or in parallel to form a battery pack, and then connect multiple battery packs to form a power battery to increase the external voltage and capacity of the battery system. output capacity. In the mass production process of single cells, due to problems such as production materials and processes, it is difficult to ens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/385G01R31/389G01R31/396
CPCG01R31/385G01R31/389G01R31/396
Inventor 张绍虹朱骞郑英向顺
Owner 深蓝汽车科技有限公司
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