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Evaluation method and system of consistency of lithium ion power cells

A technology of a battery system and an evaluation method, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of increasing the probability of the battery triggering the fault threshold, the inconsistency of the battery cells affecting the battery performance, and potential safety hazards.

Inactive Publication Date: 2018-04-13
CHINA FIRST AUTOMOBILE
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Problems solved by technology

Especially at low temperature, the inconsistency of battery cells not only affects the performance of the battery, but also increases the probability of the battery triggering the fault threshold. If the control is not good, there may even be a safety hazard

Method used

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  • Evaluation method and system of consistency of lithium ion power cells
  • Evaluation method and system of consistency of lithium ion power cells
  • Evaluation method and system of consistency of lithium ion power cells

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Embodiment Construction

[0024] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0025] figure 1 It is a schematic flowchart of the lithium-ion power battery consistency evaluation method provided by the embodiment of the present invention. like figure 1 As shown, the embodiment of the present invention provides a lithium-ion power battery consistency evaluation method, including static consistency evaluation before the battery cells are assembled into a battery system and dynamic consistency evaluation after the battery cells are assembled into a battery system. Wherein, the static consistency evaluation includes the consistency evaluation of capacity range, tolerance, pressure difference and internal resistance difference, such as figure 2 As shown, the static consistency evaluation specifically includes the following steps:

[0...

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Abstract

The invention provides an evaluation method and system of consistency of lithium ion power cells. The method comprises steps of static state consistency evaluation before cell single bodies are assembled into a cell system and dynamic state consistency evaluation after the cell single bodies are assembled into the cell system. The static state consistency evaluation comprises evaluation of consistency of capacity ranges, tolerance, voltage difference and internal resistance difference. The dynamic state consistency evaluation comprises evaluation of consistency of voltage standard difference and voltage ranges. According to the invention, by simultaneously controlling the static state consistency before packaging of single cells and the dynamic state consistency after the packaging, consistency of cells used in a whole vehicle can be ensured to the greatest degree; performance difference between single bodies in the cell system is effectively reduced; and service lifetime of the cellsis ensured.

Description

technical field [0001] The invention relates to a consistency evaluation method and system for a power battery, in particular to a consistency evaluation method and system for a lithium-ion power battery. Background technique [0002] With the gradual maturity of technology, the sharp drop in cost, and the comprehensive influence of factors such as incentive policies and fuel consumption regulations, lithium-ion batteries will remain the mainstream power batteries in the next 5 to 10 years. Usually, the lithium-ion power battery system for vehicles is composed of dozens or hundreds of thousands of battery cells connected in series and parallel. Due to the "barrel effect" of battery performance, the performance of key performances such as capacity and power are greatly affected by the inconsistency of each monomer in the battery system. When charging and discharging, the inconsistency of each monomer in the battery system leads to battery capacity and power And other perform...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/367G01R31/3865
Inventor 陈永胜孙焕丽许立超刘东秦
Owner CHINA FIRST AUTOMOBILE
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