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Battery pack balance protecting system and method

A technology for protecting systems and battery packs, applied in the field of power security, can solve problems such as reducing system efficiency and reliability, increasing the complexity and design difficulty of protection circuits, and increasing power consumption, so as to avoid overcharging or overdischarging, improve The effect of reliability and energy conversion efficiency

Inactive Publication Date: 2014-12-10
ANHUI LONG VOLT ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing single-cell lithium battery protection chip does not contain the balanced charge and discharge control function; the balanced charge control function of the multi-cell lithium battery protection chip requires an external CPU, which is realized through serial communication (such as I2C bus) with the protection chip. Increase the complexity and design difficulty of the protection circuit, reduce the efficiency and reliability of the system, and increase the power consumption

Method used

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  • Battery pack balance protecting system and method
  • Battery pack balance protecting system and method
  • Battery pack balance protecting system and method

Examples

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Embodiment Construction

[0011] Below, referring to the accompanying drawings, through the description of the embodiments, the specific implementation of the present invention, such as the control system involved, the mutual connection relationship, and the implementation method, are further described in detail, so as to help those skilled in the art understand the present invention Have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions.

[0012] A battery pack balance protection system, the system lithium battery pack, a control circuit, a main circuit and a shunt discharge branch, the main circuit is connected to the control circuit through a charge control switch device and a discharge control switch device, and the shunt discharge branch is connected to In the control circuit, the single-cell lithium batteries of the lithium battery pack are connected in series. The shunt discharge branch includes a charge overvoltage shunt discharge branch resi...

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Abstract

The invention relates to a battery pack balance protecting system and method. The battery pack balance protecting system comprises a lithium battery pack, a control circuit, a main circuit and shunt discharging subcircuits. The main circuit is connected with the control circuit through a charging control switching element and a discharging control switching element. The shunt discharging subcircuits are connected to the control circuit. Single lithium batteries in the lithium battery pack are in series connection. The control circuit comprises over-current detection protecting resistors, lithium battery protecting chips, an MOS (metal oxide semiconductor) used for charging control and an MOS used for discharging control. Pins CO of the single lithium battery protecting chips of the lithium battery pack are connected to the MOS used for charging control, respectively. Pins DO of the lithium battery protecting chips are connected to the MOS used for discharging control, respectively. Pins VM of the lithium battery protecting chips are connected to the main circuit through the over-current detection protecting resistors. Shunt discharging subcircuits of the lithium batteries are in series connection to pins VDD and pins VSS of the corresponding lithium battery protecting chips.

Description

technical field [0001] The invention relates to the technical field of electric power safety, in particular to a system and method for equalizing and protecting a battery pack. Background technique [0002] There are inconsistencies among the individual cells in the battery pack, and the differences caused by continuous charge-discharge cycles will accelerate the capacity decay of some individual cells. The capacity of series-connected battery packs is determined by the minimum capacity of the individual cells, so these Differences will shorten the life of the battery pack. The main reasons for this imbalance are: during the battery production process, due to the process and other reasons, there are differences in the capacity and internal resistance of the same batch of batteries; the difference in battery self-discharge rate, long-term accumulation, resulting in differences in battery capacity ; During the use of the battery, differences in the use environment such as tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/18H02J7/00H01M10/44
CPCY02E60/10
Inventor 李玉峰
Owner ANHUI LONG VOLT ENERGY CO LTD
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