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Novel lithium ion battery Cell-to-Cell modular equalization circuit based on single inductor and control method

A lithium-ion battery and balancing circuit technology, applied in charge balancing circuits, battery circuit devices, secondary battery charging/discharging, etc., can solve problems such as the reduction of balancing speed, reduce the number of uses, improve inconsistency, and reduce energy loss Effect

Pending Publication Date: 2020-01-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when it realizes Cell-to-Cell equalization, the equalization speed will decrease as the voltage difference between battery cells decreases.

Method used

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  • Novel lithium ion battery Cell-to-Cell modular equalization circuit based on single inductor and control method
  • Novel lithium ion battery Cell-to-Cell modular equalization circuit based on single inductor and control method
  • Novel lithium ion battery Cell-to-Cell modular equalization circuit based on single inductor and control method

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Effect test

Embodiment 1

[0037] This embodiment discloses a novel lithium-ion battery Cell-to-Cell modular equalization circuit based on a single inductor, the equalization circuit includes an energy storage inductor, a battery pack in series, a switch network, and a freewheeling circuit Unit SX, 1 voltage sampling circuit, 1 controller and 1 switch drive circuit; among them, series battery pack, voltage sampling circuit, controller, switch drive circuit, freewheeling unit SX, energy storage inductor, switch network in sequence connect.

[0038] figure 1 It is a schematic diagram of a new lithium-ion battery Cell-to-Cell modular equalization circuit based on a single inductor, including 1 energy storage inductor, 1 series battery pack, 1 switch network, 1 freewheeling unit SX, and 1 voltage Sampling circuit, 1 controller, 1 switch drive circuit.

[0039] The series battery pack is composed of 2N lithium-ion batteries in series, and all battery cells are numbered B from right to left 1 , B 2 , B 3...

Embodiment 2

[0047] A control method for a novel lithium-ion battery Cell-to-Cell modular equalization circuit based on a single inductance, such as Figure 5 As shown, the control method includes the following steps:

[0048] S1. The voltage sampling circuit collects the voltage of each battery through a voltage sensor and transmits the voltage information to the controller;

[0049] S2. The controller compares the voltage of all battery cells, and the number of the battery cell with the highest recorded voltage is B x , odd-numbered battery B 1 , B 3 , B 5 ,...B 2N-1 The battery cell number with the lowest medium voltage is B y , even-numbered battery B 2 , B 4 , B 6 ,...B 2N The battery cell number with the lowest medium voltage is B z ;

[0050] S3, respectively calculate battery B x with B y and battery B x with B z If the voltage difference is less than the equalization threshold, the equalization will end, and if the voltage difference is greater than the equalization...

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PUM

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Abstract

The invention discloses a novel lithium ion battery Cell-to-Cell modular equalization circuit based on a single inductor and a control method. The equalization circuit comprises an energy storage inductor, a series battery pack, a switching network, a follow current unit SX, a voltage sampling circuit, a controller and a switch driving circuit. According to the structure of the equalization circuit, switches and batteries form equalization modules, and ports of a plurality of equalization modules are connected to form the equalization circuit of a large battery pack. The circuit has the advantages of simple structure, few switching devices and easiness in modularization, and can realize Cell-to-Cell equalization of the lithium ion battery pack, reduce energy loss, improve the inconsistencyof the lithium ion battery pack and effectively improve the available capacity of the battery pack.

Description

technical field [0001] The invention relates to the technical field of equalization of lithium-ion battery packs, in particular to a novel lithium-ion battery Cell-to-Cell modular equalization circuit and a control method based on a single inductor. Background technique [0002] At present, large-scale serial lithium-ion battery packs play a key role as energy storage devices in the development of new energy power generation and new energy electric vehicles. In the process of using the battery pack in series, due to the influence of the manufacturing process and working conditions, the individual battery cells in the battery pack usually have inconsistencies. The inconsistency of battery cells means that after batteries of the same specification and type form a battery pack, as the number of times the batteries are used continues to increase, the battery voltage, capacity and its decline rate, SOC, SOH, self-discharge rate and its change rate of each cell , internal resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44H01M10/48H02J7/00
CPCH01M10/4207H01M10/425H01M10/441H01M10/482H02J7/0019H01M2010/4271Y02E60/10
Inventor 康龙云林鸿业罗璇卢楚生令狐金卿张健彬赵子先周海兰
Owner SOUTH CHINA UNIV OF TECH
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