Equalization circuit topology structure of layered battery and battery equalization method

A circuit topology, battery balancing technology, applied in battery circuit devices, secondary battery charging/discharging, circuits, etc., can solve problems such as slow balancing, shorten balancing time, and solve low balancing efficiency.

Pending Publication Date: 2018-09-28
安徽汉星储能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a layered battery equalization circuit topology and battery equalization method to solve the problem of slow equalization in the prior art

Method used

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  • Equalization circuit topology structure of layered battery and battery equalization method

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Embodiment 1

[0024] A layered battery balancing circuit topology, as attached figure 1 As shown, it includes a plurality of batteries connected in series in sequence, and the two ends of each battery are respectively connected in series with a first control switch and a second control switch, and the node between the first control switch and the second control switch is connected to the There is also a first equalizer circuit connected in series between the batteries, the first equalizer circuit includes parallel protection diodes and MOS switches, the node between two adjacent batteries is connected to the The nodes between the first equalizer circuits are respectively connected in series with energy storage capacitors; both the first control switch and the second control switch are contact switches, and the MOS switch is a P-type MOS switch; the above constitutes the topology of this embodiment of the first layer.

[0025] The second layer of the topological structure of this embodiment...

Embodiment 2

[0034] A method for equalizing a battery pack, said method being applied to the equalizing circuit topology of Embodiment 1, comprising the following steps:

[0035] Step S1, calculating the SOC value of each battery respectively, and setting the SOC value threshold;

[0036] Step S2, performing discharge equalization on batteries whose SOC value is higher than the threshold value, and storing the discharge capacity in the energy storage inductor;

[0037] Step S3 , charge and balance the batteries whose SOC values ​​are lower than the threshold, until the SOC values ​​of all the batteries are within the threshold.

[0038] Step 2 specifically includes the following steps:

[0039] Step S21, closing the first control switch and MOS switch corresponding to the battery whose SOC value is higher than the threshold value, and the battery whose SOC value is higher than the threshold value is connected to the energy storage inductor connected to the battery whose SOC value is highe...

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Abstract

The invention discloses an equalization circuit topology structure of a layered battery and a battery equalization method. The equalization circuit topology structure comprises a plurality of batteries which are sequentially connected in series, wherein the number of the batteries is larger than or equal to 2, a first control switch and a second control switch are sequentially connected in serieswith two ends of each battery, first equalizer circuits are further connected in series between a node between the first control switch and the second control switch and the batteries, an energy storage capacitor is connected in series between a node between two adjacent batteries and a node between two first equalizer circuits, and each first equalizer circuit comprises a protection diode and anMOS switch which are connected in parallel. By the equalization circuit topology structure of the layered battery and the method, the equalization efficiency in the circuit with relatively many batteries connected in series can be greatly improved, the bidirectional energy conversion capability is high, the modular design is simple, and all single batteries are not needed to be involved during theequalization process.

Description

technical field [0001] The invention relates to the field of equalization of battery packs, in particular to a layered battery equalization circuit topology and a battery equalization method. Background technique [0002] When lithium-ion batteries are used as the energy storage carrier of the energy storage system or the energy source of electric vehicles, the voltage and capacity of the single battery cannot meet the requirements of various working conditions. In order to make the lithium-ion battery reach the level of various aspects Requirements, usually need to be used in series and parallel groups. However, the overall performance of the battery pack after series-parallel connection is greatly lower than that of the single battery. At the same time, the inconsistency between the single batteries makes the use of batteries in groups more complicated, and the difficulty of battery management is also greatly increased. At this time, it is necessary to The battery is bala...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44
CPCH01M10/4207H01M10/4257H01M10/441H01M2010/4271Y02E60/10
Inventor 许亚娟
Owner 安徽汉星储能技术有限公司
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