Battery pack complementary equalization circuit
A technology of balancing circuits and battery packs, applied in charge balancing circuits, battery circuit devices, circuit devices, etc., can solve the problems of insufficient development, limited development of electric vehicles, immaturity, etc., to extend service life, improve Available capacity, the effect of achieving energy balance
Inactive Publication Date: 2016-04-20
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
Compared with power batteries, this technology has obviously not been developed enough, and the immaturity of the technology itself has greatly restricted the development of electric vehicles
Method used
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[0022] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0023] figure 1 It is the structural diagram of the battery pack complementary equalization circuit. The circuit is composed of a battery pack, a source battery module control circuit, a battery pack general control circuit, a complementary subunit 1 and a complementary subunit 2. The batteries are connected in series to form a battery pack, in which every 4 batteries form a source battery module, and each source battery module is separately connected to a source battery module control circuit and a complementary sub-unit. The control circuit of the source battery module and the complementary sub-unit are respectively connected to the main control circuit of the battery pack, and the control signal is output by the main control circuit of the battery pack, and the worki...
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The invention discloses a battery pack complementary equalization circuit. The battery pack complementary equalization circuit comprises a battery pack, a primary battery module control circuit, a battery pack master control circuit and a complementary branch circuit. The battery pack comprises four primary battery modules. Each primary battery module is independently connected with a unit of the primary battery module control circuit and the complementary branch circuit. The primary battery module control circuit and the complementary branch circuit are connected with the battery pack master control circuit respectively. Control signals are output by the battery pack master control circuit, the working time sequence of the battery module control circuit and the complementary branch circuit is allocated to enable each single battery between primary battery modules and each single battery inside the primary battery modules to achieve bidirectional dynamic lossless equalization in the charge and discharge process. The battery pack complementary equalization circuit can ensure that overcharge and overdischarge of each single battery are avoided in the charge and discharge process to enable the battery pack to get rid of the cask effect, the available capacity of the battery pack is improved, and the service life of the battery pack is prolonged.
Description
technical field [0001] The invention relates to the field of battery management systems, in particular to a battery pack complementary equalization circuit. Background technique [0002] The core of electric vehicles or energy storage devices is the battery. Although lithium-ion batteries have the advantages of small size, high energy density, no memory effect, and high self-discharge rate, but at the same time, lithium-ion batteries also have many disadvantages, such as high requirements for charging and discharging. High, the improper use life will be greatly shortened, the stored energy should not be too large, the use of series and parallel problems and safety of use, etc. In the industry, the battery equalization circuit is usually called the "brain" of the electric vehicle power battery system, and together with the power battery and the vehicle control system, constitute the three core technologies of electric vehicles. The emergence of the battery equalization circu...
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IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 康龙云李文彪冯腾郭向伟
Owner SOUTH CHINA UNIV OF TECH