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Battery pack equalization circuit based on multi-secondary-side transformer and achievement method thereof

A technology of equalizing circuits and transformers, which is applied in battery circuit devices, secondary battery charging/discharging, circuit devices, etc., can solve problems such as balancing speed limitations, and achieve the effects of improving performance, improving inconsistency, and improving equalization efficiency

Active Publication Date: 2014-07-30
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the number of battery cells is large, since the energy transfer of this equalization method must be transmitted one by one, the equalization speed is greatly limited.

Method used

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  • Battery pack equalization circuit based on multi-secondary-side transformer and achievement method thereof
  • Battery pack equalization circuit based on multi-secondary-side transformer and achievement method thereof
  • Battery pack equalization circuit based on multi-secondary-side transformer and achievement method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Taking a battery pack composed of 8 battery cells as an example, every 4 battery cells is a battery cell. The microcontroller adopts the digital signal processor DSP, the voltage acquisition module adopts the voltage acquisition integrated chip of the chip company, and the switch tube driving signal in the inverter module comes from the IR2110 driver.

[0050] like Figure 4 shown, B 1 , B 2 , B 3 , B 4 , B 5 , B 6 , B 7 , B 8 make up the battery pack, where B 1 , B 2 , B 3 , B 4 Belongs to equalization module one, B 5 , B 6 , B 7 , B 8 It belongs to the second equalization module. Multi-secondary transformer T in equalization module 1 1 After the secondary side passes through the switch S, it is connected with the multi-secondary side transformer T in the equalization module 2 2 the secondary connection.

[0051] state 1, such as Figure 4 shown, assuming B 2 , B 6 For low voltage cells, it needs to absorb energy. The total voltage of the equaliz...

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Abstract

The invention discloses a battery pack equalization circuit based on a multi-secondary-side transformer and an achievement method thereof. The equalization circuit mainly comprises a microcontroller, a voltage collection module, the multi-secondary-side transformer, a contravariant half-bridge rectifier module and a switch module. The microcontroller selects an equalization module needing to be equalized and a single battery body according to the voltage data transmitted from the voltage collection module, and energy is transmitted to any signal battery body needing to be equalized through the multi-secondary-side transformer even through the single battery body does not belong to the discharged equalization module. The adjustable duty ratio PWM driving signal output by the microcontroller can control the magnitude of the equalization current to control the equalization speed. The equalization circuit modularization brings convenience to expansion of the battery unit, maintenance of the equalization and the like; the equalization speed is controllable, multiple kinds of equalization requirements can be met, the equalization is targeted, and the equalization efficiency is improved; the inconsistency in the battery unit is improved effectively, and whole performance of the battery unit is improved.

Description

technical field [0001] The invention relates to a battery pack balancing circuit based on multiple secondary transformers and a method for realizing the same. Background technique [0002] Electric vehicles have the advantages of energy saving, environmental protection and low emissions, and have become the most promising field in the automotive industry. As a key component of an electric vehicle, the performance of the power battery unit determines the performance of many aspects of an electric vehicle. Due to its relatively high energy density and low self-discharge rate, lithium-ion batteries are widely used in electric vehicles, UPS and other power supply occasions. However, due to the low cell voltage and small capacity of lithium-ion batteries, which cannot meet the driving power requirements of electric vehicles, a large number of lithium-ion batteries are generally used in series. However, in the production process of lithium-ion battery cells, due to the productio...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/42H01M10/44
CPCY02E60/10
Inventor 崔纳新纪祥张承慧商云龙
Owner SHANDONG UNIV
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