Dual-target direct equalization circuit and equalization method of battery pack
A technology of equalization circuit and equalization method, which is applied in the direction of charge equalization circuit, battery circuit device, safety/protection battery circuit, etc. It can solve the problems of performance degradation, increase the gap of battery capacity, and cannot reduce the gap, so as to improve consistency , prolong battery life, and reduce the amount of online computation
A technology of equalization circuit and equalization method, which is applied in the direction of charge equalization circuit, battery circuit device, safety/protection battery circuit, etc. It can solve the problems of performance degradation, increase the gap of battery capacity, and cannot reduce the gap, so as to improve consistency , prolong battery life, and reduce the amount of online computation
CN107733007AActive Publication Date: 2018-02-23HENAN POLYTECHNIC UNIV
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[0032] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0033] figure 1 It is the schematic diagram of the equalization circuit. Among them, the series battery pack is divided into upper and lower parts, the upper part of the single cells is the upper battery, and the lower half of the single cells is the lower battery; when the total number of single cells n is an even number, the number of the upper and lower part of the single cells Both are (n / 2), when the total number of single cells n is an odd number, the number of upper single cells is [(n+1) / 2], and the number of lower single cells is [(n-1) / 2]; Single cells are named B from top to bottom 1 , B 2 , B 3 ,...B n , B 1 The positive pole of the terminal is connected to VCC, B n The negative pole of the terminal is connected to GND. Each single battery is connected with a balancing sub-circuit.
[0034] figure 2 It is ...
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The invention discloses a dual-target direct equalization circuit of a battery pack. A series battery pack comprises at least three single batteries and is divided into an upper part and a lower part,each single battery is connected with an equalization sub-circuit, the equalization sub-circuit comprises two metal-oxide-semiconductor field-effect transistors (MOSFETs) and an energy storage inductor, the series battery pack and the equalization sub-circuit bridge between VCC and GND, each equalization circuit is also connected with a control circuit to achieve direct equalization on an equalization target, the control circuit is used for equalizing end voltages and SOC of the single batteries in a stage way within an equalization period by simultaneously taking the end voltages and the SOCof the single batteries as equalization indexes, and dual-target equalization on the end voltages and the SOC of the single batteries is achieved by controlling on / off of the two MOSFETs of the equalization sub-circuit and by an energy storage effect of the energy storage inductor. The equalization circuit and an equalization strategy are applicable to an equalization management system of an energy storage device in a hybrid electric vehicle, a blade electric vehicle and an energy storage power station.
Description
technical field [0001] The invention relates to a dual-objective direct equalization technology and equalization method of a series battery group, which is suitable for a battery management system of a hybrid electric vehicle, a pure electric vehicle or an energy storage device in an energy storage power station. Background technique [0002] Due to the limited capacity of single cells and the low voltage of single cells, power battery packs are generally composed of multiple single cells connected in series and parallel to meet the requirements of use. Due to the inevitable inconsistency between single cells of the same type, it will seriously affect the service life of the battery pack and easily lead to overcharging and overdischarging. After multiple charge-discharge cycles in series battery packs, the distribution of the remaining capacity of each single battery will generally appear in three situations: the remaining capacity of individual single batteries is high; the...
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Patent Timeline
23 Feb 2018
Publication
CN107733007A
- IPC
- H02J7/00; B60L11/18
- CPC
- H02J7/0026; H02J7/0027; H02J7/0019; H02J7/0036; H02J7/0068; B60L53/00; B60L58/22; H02J7/00302
- Inventors
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