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Battery management system and balance method with parallel balance function

A technology of battery management system and equalization method, which is applied in the field of new energy vehicle electronics, and can solve problems such as increased cost burden and inability to change the equalized current

Active Publication Date: 2017-11-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the general active equalization circuit uses a PWM controller. After the circuit design is completed, the equalization current cannot be changed, such as the current mode controller UC3844
The use of high-end bidirectional current DC-DC controllers, such as the EMB1499Q used in conjunction with the EMB1428Q, increases the cost burden

Method used

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  • Battery management system and balance method with parallel balance function
  • Battery management system and balance method with parallel balance function
  • Battery management system and balance method with parallel balance function

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Embodiment 1

[0080] This embodiment will further illustrate the battery management system with parallel balancing function disclosed in the invention with reference to the accompanying drawings.

[0081] figure 1 It is a structural diagram of the battery management system. The whole system adopts a multi-master structure, including a 24-cell lithium-ion battery pack, six battery monitoring modules based on single-chip microcomputers, a main controller, six single-cell battery gating modules, and an active balancing module. , a communication module, a charging and discharging protection device and a power supply module.

[0082] The Mega32HVB chip of the ATMEL company used in the battery monitoring module. The chip is a high-performance, low-power 8-bit single-chip microcomputer, which is powered by the managed battery. It adopts a leading RISC architecture, which is more conducive to programming and realizing functions; the 12-bit voltage ADC can manage the voltage monitoring of 1-4 batte...

Embodiment 2

[0115] This embodiment discloses an equalization method based on the battery management system with parallel equalization function disclosed in the above embodiments, as shown in Figure 2(a) and Figure 2(b), which specifically includes the following steps:

[0116] S1. In the static working condition, first use the open circuit voltage method to measure the initial capacity of the battery to facilitate the calculation of the equalization time during equalization; then use the ampere-hour integration method and Kalman filter to calculate the SOC of each single battery in the battery pack. 10 seconds to update and save in the main controller;

[0117] S2. Judging the working conditions of the battery pack, and then notifying the main controller of the working conditions of the battery pack, wherein the working conditions of the battery pack are divided into the following three situations:

[0118] Static working condition: After the battery monitoring and protection chip detects...

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Abstract

The invention discloses a battery management system and balance method with a parallel balance function. The battery management system comprises a battery pack with 24 lithium ion batteries, six single chip microcomputer-based battery monitoring modules, a main controller, six single battery gating modules, an active balance module, a communication module, a charge-discharge protection apparatus and a battery module. By virtue of the battery management system, monitoring and control for 24 batteries can be realized, and functions of monitoring the working parameters of the single batteries, and performing passive balance, active balance, parallel balance, charge-discharge overcurrent protection and upper computer communication and the like of the battery pack can be realized; meanwhile, the size of a balanced current also can be regulated, and intelligent balance can be realized; by virtue of the system, a switch matrix driver and a common power supply switch controller can be omitted; the driving of an MOSFET transistor of each single battery gating module is completed by the battery monitoring module; and the driving of an MOSFET transistor of the active balance module is completed by the main controller, so that the intelligent charge-discharge function of the balanced current controlled by software is realized.

Description

technical field [0001] The invention relates to the technical field of new energy automobile electronics, in particular to a battery management system and an equalization method with a parallel equalization function. Background technique [0002] With the increasing energy crisis and environmental pollution, new energy vehicles have gradually become a new development trend. As a representative of new energy vehicles, electric vehicles have attracted more and more attention due to their high efficiency and low pollution. [0003] However, due to the high performance requirements and harsh working environment of vehicle batteries, the management requirements for batteries are very high. Overcharging and overdischarging of the battery may seriously shorten the life of the battery, and even cause safety accidents such as explosion. Therefore, how to ensure the long life of the battery and the safety of the battery is an urgent problem for its management. [0004] The battery m...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 欧奔肖兵
Owner SOUTH CHINA UNIV OF TECH
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