Lithium ion battery pack modularization fast equalization circuit and equalizing method

A technology for lithium-ion battery packs and lithium-ion batteries, which is applied to battery circuit devices, circuit devices, collectors, etc., can solve the problems of low battery life, long equalization time, and unbalanced battery packs, so as to save equalization time and lead Low on-resistance and reduced heat loss

Inactive Publication Date: 2013-07-10
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low overall life of the battery pack caused by the imbalance between the battery cells connected in series in the existing lithium-ion b

Method used

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  • Lithium ion battery pack modularization fast equalization circuit and equalizing method
  • Lithium ion battery pack modularization fast equalization circuit and equalizing method
  • Lithium ion battery pack modularization fast equalization circuit and equalizing method

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specific Embodiment approach 1

[0025] Specific implementation mode one: the following combination figure 1 and figure 2 Describe this embodiment mode, a kind of lithium-ion battery pack modular fast equalization circuit described in this embodiment mode, it comprises lithium-ion battery pack 10, described lithium-ion battery pack 10 is made up of 6N lithium-ion batteries connected in series, N is greater than or A positive integer equal to 3, the lithium-ion battery pack 10 is divided into 2N three-cell battery modules, each three-cell battery module is composed of three adjacent lithium-ion batteries, and the lithium-ion battery pack modular fast equalization circuit also includes 2N A three-unit equalization sub-module 1, an equalization main module 2, a switch network 3, N integrated voltage acquisition circuits 4, a microcontroller 6, a first energy transmission bus 18, a second energy transmission bus 19, and a third energy transmission bus 20 and the fourth energy transmission bus 21, the switch net...

specific Embodiment approach 2

[0030] Specific implementation mode two: the following combination figure 1 and image 3 Describe this embodiment, this embodiment is a further description of specific embodiment 1, the three-cell equalization sub-module 1 includes 4 Hall current acquisition circuits, 4 self-recovery protection circuits and 1 bidirectional DC / DC conversion 8, the bidirectional DC / DC converter 8 includes 1 primary winding 25, 3 secondary windings, 4 RCD snubber circuits 9 and 7 NMOS switch tubes, each RCD snubber circuit 9 includes 1 resistor Rm, 1 A capacitor Cm and a diode Dm, 4 Sm switch tubes and 3 Sw switch tubes in the 7 NMOS switch tubes;

[0031] The three single cells Bm-1, Bm-2, and Bm-3 in each three-cell battery module are connected in series to form a positive terminal, a negative terminal and two intermediate connection points, and the positive terminal passes through a self-recovery protection circuit At the same time, it is connected with the same-named end of the first second...

specific Embodiment approach 3

[0044] Specific implementation mode three: the following combination Figure 6 Describe this embodiment, this embodiment is a further description of the second specific embodiment, the Hall current acquisition circuit uses an integrated Hall current sensor 29, used to collect the primary side winding 25 and the secondary side of the three-cell equalization sub-module 1 The current amplitude and current direction of the winding, the Hall current sensor 29 includes a current sensing circuit 30, an amplifier circuit 31 and a filter circuit 32, the current is input to the amplifier circuit 31 through the current sensing circuit 30, and the amplified current signal is filtered In the circuit 32, the filtered current signal is input into the microcontroller 6 through the A / D conversion interface.

[0045] In this embodiment, the integrated Hall current sensor 29 can collect bidirectional current, and judge the direction and magnitude of the current according to different voltages. ...

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Abstract

The invention discloses a lithium ion battery pack modularization fast equalization circuit and an equalizing method and belongs to the field of the lithium ion battery pack modularization fast equalization circuit and the equalizing method. The lithium ion battery pack modularization fast equalization circuit and the equalizing method aim at solving the problems that the service life of a whole battery pack is short due to disequilibrium of battery cells, in series connection, in an existing lithium ion battery pack, and an existing ordinary bi-directional equalizer is long in equalizing time. According to the lithium ion battery pack modularization fast equalization circuit and the equalizing method, a lithium ion battery pack is divided into 2N three-cell battery modules, wherein each three-cell battery module is composed of three adjacent lithium ion batteries, the lithium ion battery pack further comprises 2N three-cell equilibrium sub-modules, an equilibrium main module, a switching network, N integration voltage acquisition circuit, a microcontroller, a first energy transmission bus, a second energy transmission bus, a third energy transmission bus and a fourth energy transmission bus, the switching network comprises 2N+1 switches which are M1 to M (2N+1), and the three-cell battery modules and the three-cell equilibrium sub-modules are arranged in a one-to-one corresponding mode. The lithium ion battery pack modularization fast equalization circuit and the equalizing method can be used in a series connection power battery pack.

Description

technical field [0001] The invention relates to a modular fast equalization circuit and an equalization method of a lithium ion battery pack. Background technique [0002] The series power battery pack is composed of many battery cells connected in series or in parallel. Due to the difference in the manufacturing process of the battery cells, there may be inconsistencies in the internal resistance of the battery cells, and at the same time, there may be differences due to the influence of temperature and aging. After a period of cyclic charge and discharge, there will be an imbalance between the monomers. If you continue to use it, it is easy to cause the low-capacity monomer in the battery pack to experience overcharging and over-discharging. If you work in this state for a long time, the battery life will be shortened due to the low capacity, and it will eventually become a load on the battery pack, and the heat will increase. Affect the service life and safety of the en...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 朱春波孙金磊魏国逯仁贵
Owner HARBIN INST OF TECH
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