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Dynamic balance circuit for battery management system and dynamic balance method for battery management system

A battery management system and dynamic equalization technology, applied in charge equalization circuits, battery circuit devices, electric vehicles, etc., can solve the problems of unfavorable service life of acquisition equalization modules and batteries, and unsuitable constant current, so as to ensure safe management, The effect of improving reliability

Inactive Publication Date: 2016-03-23
SHENZHEN KELIE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it is not suitable to manage single cells with constant current in different temperature environments.
If in a high temperature environment, the battery is still fully loaded for monomer balancing management, it will be detrimental to the service life of the acquisition and balancing module and the battery

Method used

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  • Dynamic balance circuit for battery management system and dynamic balance method for battery management system
  • Dynamic balance circuit for battery management system and dynamic balance method for battery management system
  • Dynamic balance circuit for battery management system and dynamic balance method for battery management system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The dynamic equalization circuit of the battery management system improved in this embodiment is as follows: figure 2 shown. The specific models and functions of the unit circuits and components used in the specific implementation are described as follows:

[0023] Including the following circuit units:

[0024] 1) The number of high-speed signal electronic switches S1-S5 is 4 in this example, so there are 5 high-speed signal electronic switches. In actual application, the number of monomers can be much greater than 5 depending on the specific application. The high-speed signal electronic switch S1~S5 device models are high-voltage solid relays. The model is: relay optocoupler-PS7241-2A-DualChannels-MOSFET output- 400V‐120mA‐30Ω‐1500V‐SOP8‐UL+EU.

[0025] The specific function of the high-speed signal electronic switches S1-S5 in the circuit is to switch the battery cells that need to collect channels. The characteristics are: long life, high withstand voltage, fas...

Embodiment 2

[0050] This embodiment is suitable for the situation that the acquisition module CPU does not have the environment temperature detection. In this example, a thermistor sampling circuit is added near the DC / DC, and the ambient temperature of the DC / DC circuit accessories and the ambient temperature of each single battery are sampled as the criterion for the equalization current. Schematic diagram such as image 3 shown.

[0051] The 4051 channel switching circuit measures the temperature information of each single battery, converts the temperature information into voltage information, passes through the 4051 channel switching circuit, and then enters the third AD converter 3 of the CPU through an op amp.

[0052] The models in this example are: B$AnalogSwitch / Multiplexer, CD74HC4051, 8ChannelBidirectionalAnalogSwitch, SOP16 and operational amplifier -OP07C-SingleChannels-0.15mV-0.3V / us-SOP8-.

[0053] The thermistor is an NTC chip resistor, and its function is to measure the ...

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Abstract

The invention relates to a dynamic balance circuit for a battery management system and a dynamic balance method for the battery management system. The circuit comprises a single battery voltage collection circuit, a two-way high-frequency switching power supply converter, a control circuit and a single battery temperature collection device, wherein the control circuit controls the two-way high-frequency switching power supply converter and discharges one single battery with a relatively high voltage; the discharged energy is used for charging one single battery with a relatively low voltage; the single battery temperature collection device detects the temperatures of the single batteries; and the controller dynamically adjusts the magnitudes of balanced charging and discharging currents of the single batteries according to the temperature of different single batteries. According to the dynamic balance circuit for the battery management system and the dynamic balance method, the function of dynamically adjusting the magnitudes of balanced charging and discharging currents according to dual redundancy judgment of an internal environment temperature of a BMS collection and balance module and environmental temperatures of the single batteries is added; the reliability of a BMS product is further improved; and the safety management of the BMS is ensured.

Description

technical field [0001] The invention relates to a battery management system (BMS), in particular to a dynamic equalization circuit of the battery management system and a dynamic equalization method thereof. Background technique [0002] When new batteries such as lithium-ion batteries are used in series, in order to ensure the safe use of batteries, it is generally necessary to configure a battery management system (BMS). The function of the BMS is mainly used to detect the voltage of the battery cells in real time. If the voltage of each cell in the series battery pack is inconsistent, it needs to be balanced. The balance function refers to the voltage, capacity and charge of each cell in the battery pack. It is a function that the discharge characteristics tend to be consistent. There are two common methods: energy dissipation type one-way equalization and energy transfer type two-way equalization. [0003] Energy dissipation type one-way equalization: refers to connectin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 胡运平张志国仝瑞军张泱渊
Owner SHENZHEN KELIE TECH
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