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Battery management system, battery current detection method thereof and vehicle

A battery management system and voltage detection technology, applied in the field of vehicles, can solve the problems that the current detection results are difficult to meet user needs, and the range and accuracy of the current sensor are limited.

Pending Publication Date: 2022-05-13
优跑汽车技术(上海)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current detection result is limited by the range and accuracy of the current sensor, which makes the current detection result difficult to meet user needs

Method used

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  • Battery management system, battery current detection method thereof and vehicle
  • Battery management system, battery current detection method thereof and vehicle
  • Battery management system, battery current detection method thereof and vehicle

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Embodiment Construction

[0014] At present, when detecting the current value of the power battery, a current sensor is usually installed on the bus bar (BUSBAR) of the battery pack, and the current sensor collects the current flowing through the bus bar to obtain the current current value of the battery pack. The current value is actually obtained by measuring the voltage across the current sensor and the impedance of the current sensor itself. The ratio between the two is the current current value of the battery pack.

[0015] The current sensor can be a shunt or a Hall sensor. Moreover, the range and sampling accuracy of the current sensor directly affect the accuracy of the BMS in estimating the parameters of the power battery. further increase.

[0016] To solve this problem, the present invention provides a battery management system, which can directly detect the voltage of the busbar where the battery pack is located, and obtain the impedance of the busbar at the length of the voltage detection...

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Abstract

The invention discloses a battery management system, a battery current detection method thereof and a vehicle. The battery management system comprises an impedance acquisition module which is suitable for acquiring the impedance of a preset length section of a bus where a battery pack is located; the battery pack comprises a plurality of battery packs, and each battery pack comprises a plurality of single batteries; all single batteries in the battery pack are connected in series on a bus; the voltage detection module is suitable for detecting the voltage of the bus of the preset length section; and the current calculation module is suitable for taking the ratio of the voltage value of the bus of the preset length section to the impedance value of the bus of the preset length section as the current current value of the battery pack. By applying the scheme, the current detection result is not limited by the precision and the measuring range of the current sensor, and the user demand can be better met.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a battery management system, a battery current detection method thereof, and a vehicle. Background technique [0002] In recent years, with the rapid development of my country's new energy industry, new energy vehicles have become more and more popular. New energy vehicles can use power batteries as the source of power, and the state of the battery pack determines the operating state of the vehicle. [0003] The current value of the power battery is an important parameter of the battery pack. Specifically, the current value of the power battery is an important parameter of the battery management system (Battery Management System, BMS), and the estimation algorithm of many other parameters of the power battery will use the current value of the power battery. [0004] The current value of the current detection of the power battery is mostly obtained through the collection of the...

Claims

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Application Information

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IPC IPC(8): G01R31/3842
CPCG01R31/3842
Inventor 陶孟锋曹宝健鲁连军吴斌陈毅江龙超李鹏唐善政
Owner 优跑汽车技术(上海)有限公司