Active equalizing system and equalizing method for power lithium ion battery pack

A lithium-ion battery pack, active balancing technology, applied in battery circuit devices, secondary battery repair/maintenance, current collectors, etc., can solve problems such as capacity reduction, and achieve convenient connection, good scalability, and reliability. and high stability

Active Publication Date: 2013-08-07
CETHIK GRP
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the charging process, the single lithium-ion battery with the smallest capacity will be fully charged first. In order to protect the power lithium-ion battery pack, the entire power lith...

Method used

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  • Active equalizing system and equalizing method for power lithium ion battery pack

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Embodiment Construction

[0026] The present invention is further described below in conjunction with specific embodiment, but protection scope of the present invention is not limited thereto:

[0027] Such as figure 1 As shown, the active equalization system of the power lithium-ion battery pack includes: a battery module 1, a matrix control circuit 4, a DC / DC unit 6, a PWM control unit 5, a main control unit 3, and a voltage and temperature sampling unit 2; the battery module 1 is composed of n single cells in series, and both ends of all single cells in the battery module 1 are connected to the voltage and temperature sampling unit 2; the matrix control circuit 4 includes 2n controllable switches, and any single cell in the battery module 1 The controllable switches at both ends of the battery are connected to the DC / DC unit 6, the DC / DC unit 6 is connected to the PWM control unit 5, the PWM control unit 5 is connected to the main control unit 3, and the main control unit 3 is also connected to the ...

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Abstract

The invention relates to an active equalizing system and an active equalizing method, in particular to an active equalizing system and an active equalizing method for a power lithium ion battery pack. The active equalizing system comprises a battery module (1), a matrix control circuit (4), a DC/DC (Direct Current to Direct Current) unit (6), a PWM (Pulse Width Modulation) control unit (5), a main control unit (3) and a voltage temperature sampling unit (2); and by control on the DC/DC unit (6) and the matrix control circuit (4), the charging and discharging direction of a transformer T1 is changed and functions of upper limit equalizing, lower limit equalizing and energy compensation on electrical quantities of unit cells in the battery module (1) are implemented. The active equalizing system and the active equalizing method have the following advantages that (1) due to the adoption of a low-loss equalizing technology, service life is prolonged; (2) the current equalizing capacity of a large current equalizing technology reaches over lOA; (3) due to the adoption of a bidirectional equalizing technology, direct bidirectional energy transfer between one random unit cell in the battery pack and the battery module can be implemented; and (4) the active equalizing system adopts a distributed design and has a simple and practical structure and very good expandability.

Description

technical field [0001] The invention relates to an active equalization system and an equalization method, in particular to an active equalization system and an equalization method for a power lithium-ion battery pack. Background technique [0002] Power lithium-ion battery packs are generally connected in series. Since the initial capacity, voltage, and internal resistance of each single lithium-ion battery are not exactly the same due to the manufacturing process, it will cause overcharging and over-charging of the single lithium-ion battery during use. When the discharge phenomenon is serious, it will lead to premature aging and failure of individual lithium-ion batteries, and the capacity of the power lithium-ion battery pack will decrease and the working life will be shortened. [0003] During the discharge process, the single lithium-ion battery with low power is discharged first. In order to protect the power lithium-ion battery pack connected in series, the entire pow...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/42
CPCY02E60/12Y02E60/10
Inventor 陈培洪卢朝洪刘大亮宋丽丽王洪
Owner CETHIK GRP
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