Method and device for full balance control of power battery of electric automobile

A power battery, balanced control technology, applied in electric vehicles, battery circuit devices, circuit devices, etc., can solve problems such as serious energy consumption, complex control circuits, and violation of the original intention of new energy vehicle development, to solve inconsistency problems and save energy. Electricity, cheap effect

Active Publication Date: 2011-05-25
QIMING INFORMATION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this control method can meet the function of balancing the power battery to a certain extent, the control circuit is very complicated, which increases the production cost of electric vehicles, and the energy consumption in t

Method used

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  • Method and device for full balance control of power battery of electric automobile
  • Method and device for full balance control of power battery of electric automobile
  • Method and device for full balance control of power battery of electric automobile

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1Shown: The power battery full balance control device is mainly composed of a microcontroller (MCU-Micro Control Unit), a voltage acquisition circuit, an active balance control circuit, a passive balance control circuit and a CAN-Controller Area Network transceiver . Among them, the AD-Analog-to-Digital Converter (AD-Analog-to-Digital Converter) module of the MCU is externally connected to a voltage acquisition circuit to complete the real-time detection of the voltage of the single power battery. The MCU will use the method of bubble sorting for the obtained power battery cell voltage parameters to find the maximum cell voltage and the minimum cell voltage. At the same time, the CAN communication module of the MCU is connected to the battery management system (BMS-Battery Management System) after the level conversion of the CAN transceiver to obtain the remaining power information of the current BMS and the battery balancing threshold. If the differen...

Embodiment 2

[0034] Such as figure 2 Shown: B0~B24 of the voltage acquisition circuit are respectively connected to the positive and negative poles B0~B24 of 24 battery cells connected in series. AGND is connected to the analog ground AGND of the MCU, and Vout is connected to the analog-to-digital conversion pin AD1 of the MCU. Vout will refresh the collected voltage information of 24 battery cells every 500ms.

[0035] The active equalization control circuit is composed of GPIO modules A and B of the MCU, the vehicle battery, and the active equalization MOS switch matrix. There are 24 N and P groups of active balanced MOS switches. Among them, pin 1 of the N group of 24 MOS switches is connected to the positive pole of the vehicle battery, pin 2 is connected to the positive pole of 24 battery cells, and pin 3 is connected to pins 1 to 24 of the GPIOA. Pin 1 of the 24 MOS switches in Group P is connected to the negative pole of the vehicle battery, pin 2 is connected to the negative po...

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Abstract

The invention discloses a method and a device for full balance control of a power battery of an electric automobile. In the method, an analog-digital conversion module of a microcontroller is used for acquiring single body voltage parameters of the power battery and sequencing the single body voltage parameters of the power battery; the microcontroller is connected with a battery management system to acquire dump energy information and battery balancing threshold of the current battery management system; and the method for the full balance control of the power battery of the electric automobile is implemented by the microcontroller according to the actual condition of the dump energy, or selecting an active balancing mode of starting an active balance control circuit and using an on-vehicle battery to charge the lowest battery single body, or selecting a passive balancing mode of starting a passive balance control circuit and using a balancing resistor to discharge the highest batterysingle body, or selecting a mixed balancing mode of using the two modes at the same time. By using the method and the device, a reasonable balancing strategy is established according to the dump energy of the battery, so that the problem of inconsistency of charge and discharge of the power battery is effectively solved and unnecessary electric energy consumption in balancing is effectively reduced.

Description

technical field [0001] The invention discloses a power battery full balance control method of an electric vehicle, and also provides a device for realizing the method, belonging to the technical field of new energy vehicle power control. Background technique [0002] The energy of electric vehicles mainly comes from the on-board power battery, and the on-board power battery is generally composed of multiple low-voltage battery cells connected in series. Since there are always more or less differences in the mass production of battery cells, during the charging and discharging process of the power battery, some monomer voltages will be on the high side, and some monomer voltages will be on the low side. An overall energy inhomogeneity arises. If the power battery is in this inconsistent state for a long time, it will not only affect the service life of the battery, but also easily cause battery damage and even explosion. Once this situation occurs, it will undoubtedly caus...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 吴畏朱庆林丁勇董冰
Owner QIMING INFORMATION TECH
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