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Connection failure detection method of power battery pack and battery management system

A power battery pack and connection failure technology, applied in battery/fuel cell control devices, measuring electricity, electric vehicles, etc., can solve the problems of inability to judge and prevent high-voltage busbars, and achieve the effects of avoiding local heat generation and low detection costs

Active Publication Date: 2019-08-13
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This detection method can only be judged after the poor connection of the copper bar and the connection point is ablated and fused, and it cannot be judged and prevented in the early stage of the failure of the high-voltage bus connection

Method used

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  • Connection failure detection method of power battery pack and battery management system
  • Connection failure detection method of power battery pack and battery management system
  • Connection failure detection method of power battery pack and battery management system

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Embodiment Construction

[0024] It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0025] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0026] figure 1 It is a schematic flowchart of a method for detecting connection failure of a power battery pack provided by an embodiment of the present invention. Such as figure 1 As shown, the method is applied to the BMS, and the connection failure detection method of the power battery pack includes the following steps:

[0027] Step S101, obtaining in real time the total voltage of the cells of the power battery pack, the total voltage of the power battery pack, the working current, and the resistance parameters on the high-voltage bus of the power battery pack;

[0028] Step S102, according to the total voltage of the battery cell, the total voltage of the power battery pa...

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Abstract

The invention relates to the technical field of automobile power batteries, and provides a connection failure detection method of a power battery pack and a battery management system. The problem thatjudgment and prevention cannot be carried out at the early stage of connection failure of a high-voltage bus in the power battery pack in the prior art is solved. The connection failure detection method of the power battery pack comprises the following steps that the total voltage of a battery cell in the power battery pack, the total voltage of the power battery pack, a working current and resistance parameters on the high-voltage bus of the power battery pack are acquired in real time; according to the total voltage of the battery core, the total voltage of the power battery pack, the workcurrent and the resistance parameters on the high-voltage bus of the power battery pack, the total contact resistance of a high-voltage bus connection point of the power battery pack is obtained; failure risk of high-voltage bus connection of the power battery pack is determined according to the total contact resistance and a preset threshold value. The connection failure detection method of the power battery pack and the battery management system are applicable to the judging process of high-voltage bus connection failure in the power battery pack.

Description

technical field [0001] The invention relates to the technical field of automotive power batteries, in particular to a method for detecting connection failure of a power battery pack and a battery management system. Background technique [0002] The high-voltage bus connection between the modules in the new energy electric vehicle power battery generally adopts the connection method of bolt fastening copper bars. According to the conventional process, after the copper bar fastening bolts are tightened, the fastening torque of the bolts is generally checked to ensure the reliability of the high-voltage bus connection and reduce the probability of poor high-voltage connections. However, in actual production, there are many uncontrollable factors, such as impurities in the bolt holes, poor quality of bolt threads, or bolts not tightened vertically, which may cause the actual torque to meet the process requirements during testing, but the pressure of the bolts on the copper bar ...

Claims

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Application Information

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IPC IPC(8): B60L3/00B60L58/16G01R31/382G01R31/389G01R31/04
CPCB60L3/0046B60L58/16G01R31/382G01R31/389G01R31/67Y02T10/70
Inventor 李鑫颜广博
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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