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CN106230045A - A kind of based on the two-way active equalization circuit synchronizing flyback DC/DC changer - Google Patents

A kind of based on the two-way active equalization circuit synchronizing flyback DC/DC changer Download PDF

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Publication number
CN106230045A
CN106230045A CN201610609615.3A CN201610609615A CN106230045A CN 106230045 A CN106230045 A CN 106230045A CN 201610609615 A CN201610609615 A CN 201610609615A CN 106230045 A CN106230045 A CN 106230045A
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China
Prior art keywords
lithium
discharge
ions battery
current
flyback
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Pending
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CN201610609615.3A
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Chinese (zh)
Inventor
雷英俊
马亮
石海平
赵长江
井元良
张文佳
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Beijing Institute of Spacecraft System Engineering
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Beijing Institute of Spacecraft System Engineering
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Priority to CN201610609615.3A priority Critical patent/CN106230045A/en
Publication of CN106230045A publication Critical patent/CN106230045A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0018—Circuits for equalisation of charge between batteries using separate charge circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33561—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

一种基于同步反激DC/DC变换器的双向主动均衡电路，包括锂离子蓄电池组、电压采集电路、同步反激DC/DC变换器模块、核心控制单元；锂离子蓄电池组包括多个电池单体，同步反激DC/DC变换器模块包括多个变换器，电压采集模块采集各个电池的单体电压、充电电流或者放电电流，核心控制单元计算并根据各个电池的充放电荷电量，控制变换器对电池进行充电，保证当前锂离子蓄电池组中电池电压均衡。本发明主动均衡电路，解决了锂离子蓄电池组中电池单体电压不均衡的问题，与现有技术相比，在实现锂离子蓄电池组电压均衡的同时，还具有电路结构、控制逻辑简单，可靠性高的优点。

A bidirectional active equalization circuit based on a synchronous flyback DC/DC converter, including a lithium-ion battery pack, a voltage acquisition circuit, a synchronous flyback DC/DC converter module, and a core control unit; the lithium-ion battery pack includes multiple battery cells The synchronous flyback DC/DC converter module includes multiple converters. The voltage acquisition module collects the single voltage, charging current or discharging current of each battery. The core control unit calculates and controls the conversion according to the charge and discharge of each battery. The charger charges the battery to ensure the battery voltage balance in the current lithium-ion battery pack. The active equalization circuit of the present invention solves the problem of unbalanced battery cell voltage in the lithium-ion storage battery pack. Compared with the prior art, while realizing the voltage balance of the lithium-ion storage battery pack, it also has a simple and reliable circuit structure and control logic. Advantages of high sex.

Description

一种基于同步反激DC/DC变换器的双向主动均衡电路A Bidirectional Active Equalization Circuit Based on Synchronous Flyback DC/DC Converter

技术领域technical field

本发明涉及锂离子蓄电池组技术领域，特别是一种基于同步反激DC/DC变换器的双向主动均衡电路。The invention relates to the technical field of lithium-ion battery packs, in particular to a bidirectional active equalization circuit based on a synchronous flyback DC/DC converter.

背景技术Background technique

锂离子蓄电池组是由多个锂离子单体串并联组成，由于单体的差异性，在充放电过程中锂离子蓄电池组中不同的串联单体之间会出现电压差异性，若不进行有效控制，部分锂离子蓄电池单体就会出现过充和过放现象，严重影响锂离子蓄电池组的供电安全和使用寿命，因此在锂离子蓄电池组充放电过程中，会采用均衡的办法消除不同串联单体之间电压的差异性。The lithium-ion battery pack is composed of multiple lithium-ion monomers connected in series and parallel. Due to the difference of the monomers, there will be voltage differences between different series-connected monomers in the lithium-ion battery pack during the charging and discharging process. If there is no effective control, some lithium-ion battery cells will be overcharged and over-discharged, which will seriously affect the power supply safety and service life of the lithium-ion battery pack. The difference in voltage between cells.

现有的锂离子蓄电池组均衡技术中最简单的是采用并联电阻的方法，即被动均衡，这种方法是通过将高电压单体中的能量作为热量耗散掉达到锂离子蓄电池组电压均衡的效果，具有能量利用效率差的缺点。The simplest of the existing equalization technologies for lithium-ion battery packs is the method of using parallel resistors, that is, passive equalization. This method achieves voltage equalization of lithium-ion battery packs by dissipating the energy in high-voltage monomers as heat. Effect, has the disadvantage of poor energy utilization efficiency.

发明内容Contents of the invention

本发明解决的技术问题是：克服现有技术的不足，提供了一种通过采用同步控制方法，解决了蓄电池单体中能量双向快速转移问题，具有快速实现锂离子蓄电池组电压均衡的优点的基于同步反激DC/DC变换器的双向主动均衡电路。The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a method of synchronous control, which solves the problem of bidirectional fast transfer of energy in the battery cell, and has the advantage of quickly realizing the voltage balance of lithium-ion battery packs. Bidirectional active equalization circuit for synchronous flyback DC/DC converter.

本发明的技术解决方案是：一种基于同步反激DC/DC变换器的双向主动均衡电路，包括锂离子蓄电池组、电压采集电路、同步反激DC/DC变换器模块、核心控制单元，其中The technical solution of the present invention is: a bidirectional active equalization circuit based on a synchronous flyback DC/DC converter, including a lithium-ion battery pack, a voltage acquisition circuit, a synchronous flyback DC/DC converter module, and a core control unit, wherein

锂离子蓄电池组，包括多个锂离子蓄电池单体，每个锂离子蓄电池单体均连接一个不同的同步反激DC/DC变换器；Lithium-ion battery pack, including multiple lithium-ion battery cells, each lithium-ion battery cell is connected to a different synchronous flyback DC/DC converter;

同步反激DC/DC变换器模块，包括多个同步反激DC/DC变换器，同步反激DC/DC变换器对连接的锂离子蓄电池单体进行充电或者放电；The synchronous flyback DC/DC converter module includes multiple synchronous flyback DC/DC converters, and the synchronous flyback DC/DC converter charges or discharges the connected lithium-ion battery cells;

电压采集模块，根据外部发送的采集周期周期性采集锂离子蓄电池组中各个锂离子蓄电池的单体电压后送至核心控制单元；在锂离子蓄电池组中各个锂离子蓄电池单体充电或者放电过程中，实时采集各个锂离子蓄电池单体的充电电流或者放电电流，并送至核心控制单元；The voltage acquisition module periodically collects the individual voltage of each lithium-ion battery in the lithium-ion battery pack according to the acquisition cycle sent from the outside and sends it to the core control unit; during the charging or discharging process of each lithium-ion battery in the lithium-ion battery pack , collect the charging current or discharging current of each lithium-ion battery cell in real time, and send it to the core control unit;

核心控制单元，接收各个锂离子蓄电池的单体电压后计算整个锂离子蓄电池组的平均单体电压，进而得到各个锂离子蓄电池的单体电压与锂离子蓄电池组平均单体电压的差值，根据各个锂离子蓄电池的单体电压与锂离子蓄电池组平均单体电压的差值、各个锂离子蓄电池的容量电压比得到各个锂离子蓄电池需要的充放电荷电量，对各个锂离子蓄电池单体需要的充放电荷电量进行判断，如果锂离子蓄电池单体需要的充放电荷电量为正，则根据充放电荷电量、当前锂离子蓄电池单体连接的同步反激DC/DC变换器计算得到理论放电时间，然后控制当前锂离子蓄电池连接的同步反激DC/DC变换器对当前锂离子蓄电池进行放电直至放电时间等于理论放电时间或者计算得到下一采集周期当前锂离子蓄电池的充放电荷电量；如果锂离子蓄电池需要的充放电荷电量为负，则根据充放电荷电量绝对值、当前锂离子蓄电池连接的同步反激DC/DC变换器计算得到理论充电时间，然后控制当前锂离子蓄电池连接的同步反激DC/DC变换器对当前锂离子蓄电池进行充电直至充电时间等于理论充电时间或者计算得到下一采集周期当前锂离子蓄电池的充放电荷电量；如果锂离子蓄电池需要的充放电荷电量为0，则不进行操作，等待计算得到下一采集周期充放电荷电量；接收充电或者放电电流后进行判断，当充电电流大于充电电流阈值时，控制当前充电电流对应的同步反激DC/DC变换器关断，当放电电流大于放电电流阈值时，控制当前放电电流对应的同步反激DC/DC变换器关断。The core control unit calculates the average cell voltage of the entire lithium-ion battery pack after receiving the cell voltage of each lithium-ion battery, and then obtains the difference between the cell voltage of each lithium-ion battery and the average cell voltage of the lithium-ion battery pack, according to The difference between the cell voltage of each lithium-ion battery and the average cell voltage of the lithium-ion battery group, and the capacity-voltage ratio of each lithium-ion battery can be used to obtain the charge and discharge power required by each lithium-ion battery. Judging the amount of charging and discharging charge, if the charge and discharge amount required by the lithium-ion battery cell is positive, then calculate the theoretical discharge time based on the amount of charge and discharge charge and the synchronous flyback DC/DC converter connected to the current lithium-ion battery cell , and then control the synchronous flyback DC/DC converter connected to the current lithium-ion battery to discharge the current lithium-ion battery until the discharge time is equal to the theoretical discharge time or calculate the charge and discharge capacity of the current lithium-ion battery in the next collection cycle; if the lithium-ion battery If the charging and discharging electric quantity required by the ion battery is negative, the theoretical charging time is calculated according to the absolute value of the charging and discharging electric quantity and the synchronous flyback DC/DC converter connected to the current lithium-ion battery, and then the synchronous flyback connected to the current lithium-ion battery is controlled. Excite the DC/DC converter to charge the current lithium-ion battery until the charging time is equal to the theoretical charging time or calculate the charge and discharge capacity of the current lithium-ion battery in the next acquisition cycle; if the charge and discharge capacity required by the lithium-ion battery is 0, Then do not operate, wait for the calculation of the charging and discharging charge in the next acquisition cycle; judge after receiving the charging or discharging current, when the charging current is greater than the charging current threshold, control the synchronous flyback DC/DC converter corresponding to the current charging current to turn off When the discharge current is greater than the discharge current threshold, the synchronous flyback DC/DC converter corresponding to the current discharge current is controlled to be turned off.

所述的根据各个锂离子蓄电池的单体电压与锂离子蓄电池组平均单体电压的差值、各个锂离子蓄电池的容量电压比得到各个锂离子蓄电池需要的充放电荷电量的方法为：锂离子蓄电池的单体电压与锂离子蓄电池组平均单体电压的差值、锂离子蓄电池的容量电压比相乘为锂离子蓄电池需要的充放电荷电量。According to the difference between the cell voltage of each lithium-ion storage battery and the average cell voltage of the lithium-ion storage battery, and the capacity-voltage ratio of each lithium-ion storage battery, the method for obtaining the charge and discharge electric quantity required by each lithium-ion storage battery is: The difference between the cell voltage of the battery and the average cell voltage of the lithium-ion battery pack, and the capacity-to-voltage ratio of the lithium-ion battery are multiplied to obtain the charge and discharge power required by the lithium-ion battery.

所述的各个锂离子蓄电池的电压容量比的取值范围为0.4Ah/V～80Ah/V。The value range of the voltage-to-capacity ratio of each lithium-ion storage battery is 0.4Ah/V˜80Ah/V.

所述的充电电流阈值取值范围为0A～80A，放电电流阈值取值范围为0A～80A。The value range of the charging current threshold is 0A-80A, and the value range of the discharge current threshold is 0A-80A.

所述的同步反激DC/DC变换器模块包括多个结构功能完全相同的同步反激DC/DC变换器，每个同步反激DC/DC变换器包括变压器、初级MOSFET电路、初级电流采样电路、次级MOSFET电路、次级电流采样电路；变压器原边一端与当前同步反激DC/DC变换器连接的锂离子蓄电池单体正端相连，初级MOSFET电路D端与变压器的原边另一端相连，初级电流采样电路一端与初级MOSFET电路S端相连，初级电流采样电路另一端与锂离子蓄电池单体负端相连，变压器的副边一端与锂离子蓄电池组正端相连，次级MOSFET电路D端与变压器的副边另一端相连，次级电流采样电路一端与次级MOSFET电路S端相连，次级电流采样电路另一端与锂离子蓄电池组负端相连，初级MOSFET电路G端、次级MOSFET电路G端均与核心控制单元连接；初级MOSFET电路G端、次级MOSFET电路G端接收核心控制单元发送的充电指令或者放电指令，变压器的原边、副边根据充电指令或者放电指令进行充电或者放电，其中，在进行充电时，使能锂离子蓄电池组对变压器副边进行充电、变压器原边对锂离子蓄电池单体进行充电，当进行放电时，使能锂离子蓄电池单体对变压器原边进行放电，变压器副边对锂离子蓄电池组充电。The synchronous flyback DC/DC converter module includes a plurality of synchronous flyback DC/DC converters with identical structures and functions, and each synchronous flyback DC/DC converter includes a transformer, a primary MOSFET circuit, and a primary current sampling circuit , secondary MOSFET circuit, secondary current sampling circuit; one end of the primary side of the transformer is connected to the positive end of the lithium-ion battery cell connected to the current synchronous flyback DC/DC converter, and the D end of the primary MOSFET circuit is connected to the other end of the primary side of the transformer , one end of the primary current sampling circuit is connected to the S terminal of the primary MOSFET circuit, the other end of the primary current sampling circuit is connected to the negative terminal of the lithium-ion battery cell, one end of the secondary side of the transformer is connected to the positive terminal of the lithium-ion battery pack, and the D terminal of the secondary MOSFET circuit It is connected to the other end of the secondary side of the transformer, one end of the secondary current sampling circuit is connected to the S end of the secondary MOSFET circuit, the other end of the secondary current sampling circuit is connected to the negative end of the lithium-ion battery pack, the G end of the primary MOSFET circuit, and the secondary MOSFET circuit The G terminals are connected to the core control unit; the G terminal of the primary MOSFET circuit and the G terminal of the secondary MOSFET circuit receive the charging command or discharge command sent by the core control unit, and the primary side and the secondary side of the transformer are charged or discharged according to the charging command or discharge command. , wherein, when charging, the lithium-ion battery pack is enabled to charge the secondary side of the transformer, and the primary side of the transformer is charged to the lithium-ion battery cell; when discharging, the lithium-ion battery cell is enabled to charge the primary side of the transformer Discharge, and the secondary side of the transformer charges the lithium-ion battery pack.

所述的核心控制单元接收各个锂离子蓄电池的单体电压后计算整个锂离子蓄电池组平均单体电压，进而得到各个锂离子蓄电池的单体电压与锂离子蓄电池组平均单体电压的差值，根据各个锂离子蓄电池的单体电压与锂离子蓄电池组平均单体电压的差值、各个锂离子蓄电池的容量电压比得到各个锂离子蓄电池需要的充放电荷电量，对各个锂离子蓄电池需要的充放电荷电量的进行判断，如果锂离子蓄电池需要的充放电荷电量为正，则根据充放电荷电量、当前锂离子蓄电池连接的同步反激DC/DC变换器计算得到理论放电时间，然后产生持续时间为理论放电时间的高电平信号送至初级MOSFET电路G端、次级MOSFET电路G端，其中，高电平信号首先送至初级MOSFET电路G端，控制完成当前锂离子蓄电池连接的同步反激DC/DC变换器对当前锂离子蓄电池进行放电直至放电时间等于理论放电时间或者计算得到下一采集周期当前锂离子蓄电池的充放电荷电量；The core control unit calculates the average cell voltage of the entire lithium-ion battery pack after receiving the cell voltage of each lithium-ion storage battery, and then obtains the difference between the cell voltage of each lithium-ion storage battery and the average cell voltage of the lithium-ion battery pack, According to the difference between the cell voltage of each lithium-ion battery and the average cell voltage of the lithium-ion battery pack, and the capacity-voltage ratio of each lithium-ion battery, the charge and discharge electric quantity required by each lithium-ion battery is obtained, and the charging and discharging required for each lithium-ion battery Judging the amount of discharge charge, if the charge and discharge amount required by the lithium-ion battery is positive, then calculate the theoretical discharge time based on the amount of charge and discharge charge and the synchronous flyback DC/DC converter connected to the current lithium-ion battery, and then generate a continuous The high-level signal whose time is the theoretical discharge time is sent to the G terminal of the primary MOSFET circuit and the G terminal of the secondary MOSFET circuit. Excite the DC/DC converter to discharge the current lithium-ion battery until the discharge time is equal to the theoretical discharge time or calculate the charge and discharge of the current lithium-ion battery in the next collection cycle;

如果锂离子蓄电池需要的充放电荷电量为负，则根据充放电荷电量绝对值、当前锂离子蓄电池连接的同步反激DC/DC变换器计算得到理论充电时间，然后产生持续时间为理论充电时间的高电平信号送至初级MOSFET电路G端、次级MOSFET电路G端，其中，高电平信号首先送至次级MOSFET电路G端，控制当前锂离子蓄电池连接的同步反激DC/DC变换器对当前锂离子蓄电池进行充电直至充电时间等于理论充电时间或者计算得到下一采集周期当前锂离子蓄电池的充放电荷电量；If the required charging and discharging charge of the lithium-ion battery is negative, the theoretical charging time is calculated according to the absolute value of the charging and discharging charge and the synchronous flyback DC/DC converter connected to the current lithium-ion battery, and then the generated duration is the theoretical charging time The high-level signal is sent to the G terminal of the primary MOSFET circuit and the G terminal of the secondary MOSFET circuit. The high-level signal is first sent to the G terminal of the secondary MOSFET circuit to control the synchronous flyback DC/DC conversion currently connected to the lithium-ion battery. The device charges the current lithium-ion battery until the charging time is equal to the theoretical charging time or calculates the charge and discharge of the current lithium-ion battery in the next collection cycle;

如果锂离子蓄电池需要的充放电荷电量为0，则不进行操作，等待计算得到的下一采集周期充放电荷电量；接收充电或者放电电流后进行判断，当充电电流大于充电电流阈值时，控制当前充电电流对应的同步反激DC/DC变换器中次级MOSFET电路G端关断，当放电电流大于放电电流阈值时，控制当前放电电流对应的同步反激DC/DC变换器中初级MOSFET电路G端关断。If the charging and discharging electric quantity required by the lithium-ion battery is 0, no operation is performed, and the charging and discharging electric quantity is waited for in the next collection period calculated; judgment is made after receiving the charging or discharging current, and when the charging current is greater than the charging current threshold, control The G terminal of the secondary MOSFET circuit in the synchronous flyback DC/DC converter corresponding to the current charging current is turned off. When the discharge current is greater than the discharge current threshold, the primary MOSFET circuit in the synchronous flyback DC/DC converter corresponding to the current discharge current is controlled. The G terminal is turned off.

本发明与现有技术相比的优点在于：The advantage of the present invention compared with prior art is:

(1)本发明与现有技术相比，通过提出一种基于DC/DC变换器的双向主动均衡电路，解决了锂离子蓄电池组中电池单体电压不均衡的问题，能够快速实现锂离子蓄电池组的电压均衡，具有很好的使用效果；(1) Compared with the prior art, the present invention solves the problem of unbalanced voltage of battery cells in lithium-ion battery packs by proposing a bidirectional active equalization circuit based on DC/DC converters, and can quickly realize lithium-ion battery The voltage balance of the group has a good use effect;

(2)本发明主动均衡电路与现有技术相比，通过采用同步控制方法，解决了蓄电池单体中能量的双向快速转移问题，具有快速实现锂离子蓄电池组电压均衡的优点；(2) Compared with the prior art, the active equalization circuit of the present invention solves the problem of bidirectional fast transfer of energy in the battery cell by adopting a synchronous control method, and has the advantage of quickly realizing the voltage balance of the lithium-ion battery pack;

(3)本发明主动均衡电路与现有技术相比，在实现锂离子蓄电池组电压均衡的的同时，还具有电路结构、控制逻辑简单，可靠性高的优点。(3) Compared with the prior art, the active equalization circuit of the present invention has the advantages of simple circuit structure, simple control logic and high reliability while realizing the voltage balance of the lithium-ion battery pack.

附图说明Description of drawings

图1为本发明一种基于同步反激DC/DC变换器的双向主动均衡电路结构示意图；Fig. 1 is a kind of bidirectional active equalization circuit structure schematic diagram based on synchronous flyback DC/DC converter of the present invention;

图2为本发明中单体n(1≤n≤N)充电均衡工作流程图，其中，N为正整数；Fig. 2 is a flow chart of charge equalization work for monomer n (1≤n≤N) in the present invention, wherein N is a positive integer;

图3为本发明中单体n(1≤n≤N)放电均衡工作流程图；Fig. 3 is the flow chart of discharge equalization work of monomer n (1≤n≤N) in the present invention;

图4为本发明中单体n(1≤n≤N)既不充电均衡也不放电均衡流程图。Fig. 4 is a flow chart of neither charge equalization nor discharge equalization for monomer n (1≤n≤N) in the present invention.

具体实施方式detailed description

本发明针对现有的并联电阻实现锂离子蓄电池组均衡技术需要将高电压单体中的能量作为热量耗散掉带来的能量利用效率差的缺点，通过采用能量转移的方法来实现锂离子蓄电池组中各个电池单体的电压均衡，即将高电压单体中的能量有序地转移到低电压单体中，实现串联单体电压的一致性，下面结合附图对本发明进行详细说明。The present invention aims at the disadvantage of poor energy utilization efficiency caused by dissipating the energy in the high-voltage monomers as heat in the existing technology of equalizing lithium-ion battery packs with parallel resistors, and realizes the lithium-ion battery by adopting an energy transfer method The voltage balance of each battery cell in the group means that the energy in the high-voltage cells is transferred to the low-voltage cells in an orderly manner to achieve the consistency of the voltage of the cells in series. The invention will be described in detail below with reference to the accompanying drawings.

如图1所示为一种基于同步反激DC/DC变换器的双向主动均衡电路结构示意图，包括有锂离子蓄电池组接线端、电压采集电路、同步反激DC/DC变换器、核心控制单元，还包括接线端(K0、K1……Kn)，其中，K0为锂离子蓄电池组的负极，K1为锂离子蓄电池组单体1的正极，以此类推，Kn为锂离子蓄电池组单体n的正极，锂离子蓄电池组单体1到锂离子蓄电池组单体n串联形成锂离子蓄电池组。As shown in Figure 1, it is a schematic structural diagram of a bidirectional active equalization circuit based on a synchronous flyback DC/DC converter, including a lithium-ion battery pack terminal, a voltage acquisition circuit, a synchronous flyback DC/DC converter, and a core control unit , also includes terminals (K0, K1...Kn), where K0 is the negative pole of the lithium-ion battery pack, K1 is the positive pole of the lithium-ion battery pack unit 1, and so on, and Kn is the lithium-ion battery pack unit n The positive electrode of the lithium-ion storage battery unit 1 is connected in series with the lithium-ion storage battery unit n to form a lithium-ion storage battery.

同步反激DC/DC变换器模块，包括多个同步反激DC/DC变换器，每个锂离子蓄电池单体均连接一个不同的同步反激DC/DC变换器，同步反激DC/DC变换器对连接的锂离子蓄电池单体进行充电或者放电，每个同步反激DC/DC变换器包括变压器、初级MOSFET电路、初级电流采样电路、次级MOSFET电路和次级电流采样电路。变压器原边一端与当前同步反激DC/DC变换器连接的锂离子蓄电池单体正端相连，初级MOSFET电路D端与变压器的原边另一端相连，初级电流采样电路一端与初级MOSFET电路S端相连，初级电流采样电路另一端与锂离子蓄电池单体负端相连，变压器的副边一端与锂离子蓄电池组正端相连，次级MOSFET电路D端与变压器的副边另一端相连，次级电流采样电路一端与次级MOSFET电路S端相连，次级电流采样电路另一端与锂离子蓄电池组负端相连，初级MOSFET电路G端、次级MOSFET电路G端均与核心控制单元连接。Synchronous flyback DC/DC converter module, including multiple synchronous flyback DC/DC converters, each lithium-ion battery cell is connected to a different synchronous flyback DC/DC converter, synchronous flyback DC/DC conversion The converter charges or discharges the connected lithium-ion battery cells, and each synchronous flyback DC/DC converter includes a transformer, a primary MOSFET circuit, a primary current sampling circuit, a secondary MOSFET circuit and a secondary current sampling circuit. One end of the primary side of the transformer is connected to the positive end of the lithium-ion battery cell connected to the current synchronous flyback DC/DC converter, the D end of the primary MOSFET circuit is connected to the other end of the primary side of the transformer, and one end of the primary current sampling circuit is connected to the S end of the primary MOSFET circuit The other end of the primary current sampling circuit is connected to the negative end of the lithium-ion battery cell, one end of the secondary side of the transformer is connected to the positive end of the lithium-ion battery pack, the D end of the secondary MOSFET circuit is connected to the other end of the secondary side of the transformer, and the secondary current One end of the sampling circuit is connected to the S terminal of the secondary MOSFET circuit, the other end of the secondary current sampling circuit is connected to the negative terminal of the lithium-ion battery pack, and the G terminal of the primary MOSFET circuit and the G terminal of the secondary MOSFET circuit are connected to the core control unit.

电压采集模块，用于实现控制参数的电压采集，周期性采集锂离子蓄电池组中各个锂离子蓄电池的单体电压后送至核心控制单元；在锂离子蓄电池组中各个锂离子蓄电池单体充电或者放电过程中，实时采集各个锂离子蓄电池单体的充电电流或者放电电流，采样后通过数据总线送给核心控制单元。The voltage acquisition module is used to realize the voltage acquisition of control parameters, and periodically collects the individual voltage of each lithium-ion battery in the lithium-ion battery pack and then sends it to the core control unit; each lithium-ion battery in the lithium-ion battery pack is charged or During the discharge process, the charging current or discharging current of each lithium-ion battery cell is collected in real time, and the sampling is sent to the core control unit through the data bus.

核心控制单元，用于实现控制参数的逻辑判断，接收电压采集电路提供的各单体电压和各个同步反激DC/DC变换器中的原边和副边的充放电电流采样值，根据接收的各个锂离子蓄电池的单体电压计算整个锂离子蓄电池组的平均单体电压，进而得到各个锂离子蓄电池的单体电压与锂离子蓄电池组平均单体电压的差值，将各个锂离子蓄电池的单体电压与锂离子蓄电池组平均单体电压的差值、各个锂离子蓄电池的容量电压比相乘，得到各个锂离子蓄电池需要的充放电荷电量。锂离子蓄电池的容量电压比是锂离子蓄电池的固有特性，不同的锂离子蓄电池，其对应的容量电压比是不同的。对各个锂离子蓄电池单体需要的充放电荷电量进行判断，如果锂离子蓄电池单体需要的充放电荷电量为正，则根据充放电荷电量、当前锂离子蓄电池单体连接的同步反激DC/DC变换器计算得到理论放电时间，然后产生持续时间为理论放电时间的高电平信号送至初级MOSFET电路G端、次级MOSFET电路G端，其中，高电平信号首先送至初级MOSFET电路G端，控制当前锂离子蓄电池连接的同步反激DC/DC变换器对当前锂离子蓄电池进行放电直至放电时间等于理论放电时间或者计算得到下一采集周期当前锂离子蓄电池的充放电荷电量；如果锂离子蓄电池需要的充放电荷电量为负，则根据充放电荷电量绝对值、当前锂离子蓄电池连接的同步反激DC/DC变换器计算得到理论充电时间，然后产生持续时间为理论充电时间的高电平信号送至初级MOSFET电路G端、次级MOSFET电路G端，其中，高电平信号首先送至次级MOSFET电路G端，控制当前锂离子蓄电池连接的同步反激DC/DC变换器对当前锂离子蓄电池进行充电直至充电时间等于理论充电时间或者计算得到下一采集周期当前锂离子蓄电池的充放电荷电量；如果锂离子蓄电池需要的充放电荷电量为0，则不进行操作，等待计算得到的下一采集周期充放电荷电量；在同步反激DC/DC变换器充放电过程中，核心控制单元接收电压采集电路采集的充电电流和放电电流，并对充电和放电电流后进行判断，当充电电流大于充电电流阈值时，控制当前充电电流对应的同步反激DC/DC变换器中次级MOSFET电路G端关断，当放电电流大于放电电流阈值时，控制当前放电电流对应的同步反激DC/DC变换器中初级MOSFET电路G端关断。The core control unit is used to realize the logical judgment of the control parameters, receive the individual voltages provided by the voltage acquisition circuit and the sampling values of the charge and discharge currents of the primary side and the secondary side of each synchronous flyback DC/DC converter, according to the received Calculate the average cell voltage of the entire lithium-ion battery pack from the cell voltage of each lithium-ion battery, and then obtain the difference between the cell voltage of each lithium-ion battery and the average cell voltage of the lithium-ion battery pack, and divide the cell voltage of each lithium-ion battery The difference between the bulk voltage and the average cell voltage of the lithium-ion battery pack and the capacity-voltage ratio of each lithium-ion battery is multiplied to obtain the charge and discharge power required by each lithium-ion battery. The capacity-to-voltage ratio of lithium-ion batteries is an inherent characteristic of lithium-ion batteries. Different lithium-ion batteries have different corresponding capacity-to-voltage ratios. Judgment is made on the required charge and discharge of each lithium-ion battery cell. If the charge and discharge charge required by the lithium-ion battery cell is positive, the synchronous flyback DC connected to the current lithium-ion battery cell will The /DC converter calculates the theoretical discharge time, and then generates a high-level signal that lasts for the theoretical discharge time and sends it to the G terminal of the primary MOSFET circuit and the G terminal of the secondary MOSFET circuit. Among them, the high-level signal is first sent to the primary MOSFET circuit. Terminal G controls the synchronous flyback DC/DC converter connected to the current lithium-ion battery to discharge the current lithium-ion battery until the discharge time is equal to the theoretical discharge time or calculates the charge and discharge of the current lithium-ion battery in the next collection cycle; if Lithium-ion battery needs to charge and discharge charge is negative, then calculate the theoretical charging time according to the absolute value of the charging and discharging charge and the synchronous flyback DC/DC converter connected to the current lithium-ion battery, and then generate the duration of the theoretical charging time The high-level signal is sent to the G terminal of the primary MOSFET circuit and the G terminal of the secondary MOSFET circuit. The high-level signal is first sent to the G terminal of the secondary MOSFET circuit to control the synchronous flyback DC/DC converter currently connected to the lithium-ion battery. Charge the current lithium-ion battery until the charging time is equal to the theoretical charging time or calculate the charge and discharge capacity of the current lithium-ion battery in the next collection cycle; if the charge and discharge capacity required by the lithium-ion battery is 0, do not operate and wait The calculated charge and discharge charge quantity in the next collection cycle; during the charge and discharge process of the synchronous flyback DC/DC converter, the core control unit receives the charge current and discharge current collected by the voltage acquisition circuit, and judges the charge and discharge current , when the charging current is greater than the charging current threshold, control the secondary MOSFET circuit G terminal of the synchronous flyback DC/DC converter corresponding to the current charging current to turn off, and when the discharging current is greater than the discharging current threshold, control the synchronous corresponding to the current discharging current The G terminal of the primary MOSFET circuit in the flyback DC/DC converter is turned off.

本发明基于同步反激DC/DC变换器的双向主动均衡电路与现有技术相比，采用同步反激DC/DC变换器拓扑和同步控制方法，实现大电流的双向能量转移，对于任意一节锂离子蓄电池组单体，无论是此单体需要充电、还是放电或者是既不需要充电也不需要放电，本发明电路均能够完成，尤其是当多个锂离子蓄电池组中多个单体需要均衡时，本发明电路能够同时进行所有单体的均衡操作。Compared with the prior art, the bidirectional active equalization circuit based on the synchronous flyback DC/DC converter of the present invention adopts the topology of the synchronous flyback DC/DC converter and a synchronous control method to realize bidirectional energy transfer of large currents. Lithium-ion storage battery pack monomer, whether the monomer needs to be charged, discharged or neither charged nor discharged, the circuit of the present invention can be completed, especially when multiple monomers in multiple lithium-ion storage battery packs need to During equalization, the circuit of the present invention can perform equalization operations of all monomers at the same time.

现有的锂离子蓄电池组采用本发明的均衡电路后，能够同时对所有需要均衡的单体进行快速充放电均衡，确保锂离子蓄电池组所有单体的电压一致性，保证锂离子蓄电池组的使用安全性和使用寿命。相对于其他主动均衡电路，本发明的变化主要体现在同步反激DC/DC变换器的应用及其同步控制逻辑，同步反激DC/DC变换器的原边输入端与锂离子蓄电池组的相应的电池单体正负极相连，副边输入端与蓄电池组的正负极相连，电压采集电路采集锂离子蓄电池组各单体电压和同步反激DC/DC变换器的采样电压，通过数据总线接入核心控制单元，同步反激DC/DC变换器的控制信号接入核心控制单元中。同步反激DC/DC变换器分别对应于每个锂离子蓄电池组单体，包括变压器、初级MOSFET电路、初级电流采样电路、次级MOSFET电路和次级电流采样电路。变压器用于实现电能的转移，即电能从单体转移到锂离子蓄电池组和电能从锂离子蓄电池组转移到单体，变压器的初级和次级的匝数比为1：T，初级MOSFET电路和次级MOSFET电路用于电能转移的控制，实现同步反激DC/DC变换控制，初级电流采样电路和次级电流采样电路用于充放电时的电流采样，经电压采集电路采集送到核心控制单元，核心控制单元依据采集的充放电电流，当其超过预先设定的阀值时，关断同步反激DC/DC变换器。After the existing lithium-ion battery pack adopts the equalization circuit of the present invention, it can quickly charge and discharge all monomers that need to be balanced at the same time, so as to ensure the voltage consistency of all monomers in the lithium-ion battery pack and ensure the use of the lithium-ion battery pack. safety and longevity. Compared with other active equalization circuits, the changes of the present invention are mainly reflected in the application of the synchronous flyback DC/DC converter and its synchronous control logic, and the corresponding relationship between the primary side input terminal of the synchronous flyback DC/DC converter and the lithium-ion battery pack. The positive and negative poles of the battery cells are connected, and the secondary side input terminal is connected with the positive and negative poles of the battery pack. The voltage acquisition circuit collects the voltage of each single cell of the lithium-ion battery pack and the sampling voltage of the synchronous flyback DC/DC converter, and passes through the data bus It is connected to the core control unit, and the control signal of the synchronous flyback DC/DC converter is connected to the core control unit. The synchronous flyback DC/DC converter corresponds to each lithium-ion battery unit, including a transformer, a primary MOSFET circuit, a primary current sampling circuit, a secondary MOSFET circuit, and a secondary current sampling circuit. The transformer is used to realize the transfer of electrical energy, that is, the electrical energy is transferred from the monomer to the lithium-ion battery pack and the electrical energy is transferred from the lithium-ion battery pack to the monomer. The primary and secondary turns ratio of the transformer is 1:T, and the primary MOSFET circuit and The secondary MOSFET circuit is used for the control of power transfer to realize synchronous flyback DC/DC conversion control. The primary current sampling circuit and the secondary current sampling circuit are used for current sampling during charging and discharging, and are collected by the voltage acquisition circuit and sent to the core control unit. , the core control unit turns off the synchronous flyback DC/DC converter when the collected charge and discharge current exceeds a preset threshold.

本发明单体n(1≤n≤N)需要充电时，均衡电路工作流程如表1和图2所示。When the monomer n (1≤n≤N) of the present invention needs to be charged, the working flow of the equalization circuit is shown in Table 1 and FIG. 2 .

表1单体n需要充电时均衡工作过程Table 1. Equalization working process when monomer n needs to be charged

本发明单体n(1≤n≤N)需要放电电时，均衡电路工作流程如表2和图3所示。When the monomer n (1≤n≤N) of the present invention needs to discharge electricity, the working flow of the equalization circuit is shown in Table 2 and FIG. 3 .

表2单体n需要放电时均衡工作过程Table 2 Balanced working process when monomer n needs to be discharged

本发明单体n(1≤n≤N)既不需要充电也不需要放电时，均衡电路工作流程如表3和图4所示。When the monomer n (1≤n≤N) of the present invention does not need to be charged or discharged, the working flow of the equalization circuit is shown in Table 3 and FIG. 4 .

表3单体n既不需要放电也不需要充电是均衡工作过程Table 3 The monomer n needs neither discharge nor charge, which is a balanced working process

本发明说明书中未作详细描述的内容属本领域技术人员的公知技术。The content that is not described in detail in the description of the present invention belongs to the well-known technology of those skilled in the art.

Claims (6)

1. a two-way active equalization circuit based on synchronization flyback DC/DC changer, it is characterised in that include lithium ion electric power storage Pond group, voltage collection circuit, synchronization flyback DC/DC converter module, key control unit, wherein
Lithium-ions battery group, including multiple lithium-ions battery monomers, each lithium-ions battery monomer is all connected with one not Same synchronization flyback DC/DC changer；
Synchronize flyback DC/DC converter module, including multiple synchronization flyback DC/DC changers, synchronize flyback DC/DC changer pair The lithium-ions battery monomer connected is charged or discharges；
Voltage acquisition module, the collection period sent according to outside periodically gathers each lithium ion in lithium-ions battery group and stores Key control unit is delivered to after the monomer voltage of battery；In lithium-ions battery group each lithium-ions battery monomer charging or In person's discharge process, the charging current of each lithium-ions battery monomer of Real-time Collection or discharge current, and deliver to core control Unit processed；
Key control unit, calculates the average of whole lithium-ions battery group after receiving the monomer voltage of each lithium-ions battery Monomer voltage, and then obtain the monomer voltage of each lithium-ions battery and the difference of lithium-ions battery group average monomer voltage Value, according to the monomer voltage of each lithium-ions battery and the difference of lithium-ions battery group average monomer voltage, each lithium from The capacity voltage ratio of sub-accumulator obtains the discharge and recharge carrying capacity that each lithium-ions battery needs, to each lithium-ions battery The discharge and recharge carrying capacity that monomer needs judges, if the discharge and recharge carrying capacity that lithium-ions battery monomer needs just is, then The synchronization flyback DC/DC changer connected according to discharge and recharge carrying capacity, current lithium-ions battery monomer is calculated theory and puts The electricity time, current lithium-ions battery is entered by the synchronization flyback DC/DC changer then controlling the connection of current lithium-ions battery Row electric discharge is until equal to the theoretical discharge time or being calculated next collection period current lithium-ions battery discharge time Discharge and recharge carrying capacity；If lithium-ions battery need discharge and recharge carrying capacity be negative, then according to discharge and recharge carrying capacity absolute value, The synchronization flyback DC/DC changer that current lithium-ions battery connects is calculated the theoretical charging interval, then controls current lithium Current lithium-ions battery is charged until the charging interval is equal to by the synchronization flyback DC/DC changer that ion accumulator connects Theoretical charging interval or be calculated the discharge and recharge carrying capacity of the current lithium-ions battery of next collection period；If lithium ion The discharge and recharge carrying capacity that accumulator needs is 0, does not operates, and it is charged that wait is calculated next collection period discharge and recharge Amount；Judge after receiving charge or discharge electric current, when charging current is more than charging current threshold value, control current charged electrical The synchronization flyback DC/DC changer that stream is corresponding turns off, and when discharge current is more than discharging current threshold, controls present discharge electric current Corresponding synchronization flyback DC/DC changer turns off.
A kind of two-way active equalization circuit based on synchronization flyback DC/DC changer the most according to claim 1, its feature It is: the difference of the described monomer voltage according to each lithium-ions battery and lithium-ions battery group average monomer voltage, The capacity voltage ratio of each lithium-ions battery obtains the method for the discharge and recharge carrying capacity that each lithium-ions battery needs: lithium The monomer voltage of ion accumulator and the difference of lithium-ions battery group average monomer voltage, the capacity voltage of lithium-ions battery Than the discharge and recharge carrying capacity needed for lithium-ions battery that is multiplied.
A kind of two-way active equalization circuit based on synchronization flyback DC/DC changer the most according to claim 1 and 2, its It is characterised by: the span of the voltage capacity ratio of each described lithium-ions battery is 0.4Ah/V～80Ah/V.
A kind of two-way active equalization circuit based on synchronization flyback DC/DC changer the most according to claim 1 and 2, its It is characterised by: described charging current threshold value span is 0A～80A, and discharging current threshold span is 0A～80A.
A kind of two-way active equalization circuit based on synchronization flyback DC/DC changer the most according to claim 1 and 2, its It is characterised by: described synchronization flyback DC/DC converter module includes multiple structure function identical synchronization flyback DC/DC Changer, each synchronization flyback DC/DC changer includes transformator, primary MOSFET circuit, primary current sample circuit, secondary MOSFET circuit, secondary current sample circuit；The lithium that transformer primary side one end is connected with current sync flyback DC/DC changer from Sub-single battery anode is connected, and primary MOSFET circuit D end is connected with the former limit other end of transformator, primary current sampling electricity One end, road is connected with primary MOSFET circuit S end, the primary current sample circuit other end and lithium-ions battery monomer negative terminal phase Even, secondary one end of transformator is connected with lithium-ions battery group anode, and secondary MOSFET circuit D end is another with the secondary of transformator One end is connected, and secondary current sample circuit one end is connected with secondary MOSFET circuit S end, the secondary current sample circuit other end and Lithium-ions battery group negative terminal is connected, and primary MOSFET circuit G end, secondary MOSFET circuit G end are all with key control unit even Connect；Primary MOSFET circuit G end, secondary MOSFET circuit G end receive charging instruction or the electric discharge that key control unit sends Instruction, the former limit of transformator, secondary are charged according to charging instruction or electric discharge instruction or discharge, and wherein, are filling During electricity, transformer secondary is charged enable by lithium-ions battery group, lithium-ions battery monomer is carried out by transformer primary side Charging, when discharging, enables lithium-ions battery monomer and discharges transformer primary side, and transformer secondary is to lithium ion Battery charging.
A kind of two-way active equalization circuit based on synchronization flyback DC/DC changer the most according to claim 1 and 2, its It is characterised by: described key control unit calculates whole lithium ion electric power storage after receiving the monomer voltage of each lithium-ions battery Pond group average monomer voltage, and then obtain monomer voltage and the lithium-ions battery group average monomer electricity of each lithium-ions battery The difference of pressure, according to the monomer voltage of each lithium-ions battery and the difference of lithium-ions battery group average monomer voltage, each The capacity voltage ratio of individual lithium-ions battery obtains the discharge and recharge carrying capacity that each lithium-ions battery needs, to each lithium ion The carrying out of the discharge and recharge carrying capacity that accumulator needs judges, if the discharge and recharge carrying capacity that lithium-ions battery needs just is, then When the synchronization flyback DC/DC changer connected according to discharge and recharge carrying capacity, current lithium-ions battery is calculated theoretical discharge Between, then produce the high level signal that the persistent period is the theoretical discharge time and deliver to primary MOSFET circuit G end, secondary MOSFET Circuit G end, wherein, first high level signal delivers to primary MOSFET circuit G end, has controlled current lithium-ions battery and has connected Synchronization flyback DC/DC changer current lithium-ions battery is discharged until discharge time equal to the theoretical discharge time or Person is calculated the discharge and recharge carrying capacity of the current lithium-ions battery of next collection period；
If lithium-ions battery need discharge and recharge carrying capacity be negative, then according to discharge and recharge carrying capacity absolute value, current lithium from The synchronization flyback DC/DC changer that sub-accumulator connects is calculated the theoretical charging interval, and then the generation persistent period is theoretical The high level signal in charging interval delivers to primary MOSFET circuit G end, secondary MOSFET circuit G end, and wherein, high level signal is first First deliver to secondary MOSFET circuit G end, control the synchronization flyback DC/DC changer of current lithium-ions battery connection to current lithium Ion accumulator is charged until the charging interval equal to the theoretical charging interval or is calculated the current lithium of next collection period The discharge and recharge carrying capacity of ion accumulator；
If the discharge and recharge carrying capacity that lithium-ions battery needs is 0, do not operate, wait next collection calculated Cycle discharge and recharge carrying capacity；Judge after receiving charge or discharge electric current, when charging current is more than charging current threshold value, Control secondary MOSFET circuit G end in the synchronization flyback DC/DC changer that current charging current is corresponding to turn off, when discharge current is big When discharging current threshold, control primary MOSFET circuit G end in the synchronization flyback DC/DC changer that present discharge electric current is corresponding Turn off.
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CN112564231B (en) * 2020-12-10 2024-08-23 上海空间电源研究所 Lithium battery charging and discharging integrated device for arrow
CN113346567A (en) * 2021-03-22 2021-09-03 上海空间电源研究所 Lithium ion storage battery monomer active equalization circuit for carrying
CN113541235A (en) * 2021-06-03 2021-10-22 孙建宁 Storage battery pack equalizing charge and discharge management system
CN114825407B (en) * 2022-06-22 2022-10-18 锦浪科技股份有限公司 Charging and discharging switching method, device, system and medium of bidirectional converter
CN114825407A (en) * 2022-06-22 2022-07-29 锦浪科技股份有限公司 Charging and discharging switching method, device, system and medium of bidirectional converter
CN115514041A (en) * 2022-09-14 2022-12-23 中国空间技术研究院 A non-dissipative equalization management system for space lithium-ion batteries
CN115514041B (en) * 2022-09-14 2025-02-07 中国空间技术研究院 A non-dissipative balancing management system for space lithium-ion batteries

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Application publication date: 20161214