WO2011157116A1 - Lithium battery module parallel using method and system - Google Patents
Lithium battery module parallel using method and system Download PDFInfo
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- WO2011157116A1 WO2011157116A1 PCT/CN2011/074912 CN2011074912W WO2011157116A1 WO 2011157116 A1 WO2011157116 A1 WO 2011157116A1 CN 2011074912 W CN2011074912 W CN 2011074912W WO 2011157116 A1 WO2011157116 A1 WO 2011157116A1
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- lithium battery
- busbar
- battery module
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the invention relates to a method and a system for parallel use of lithium battery modules. Background technique
- Lithium batteries have high energy density, high single cell voltage, long life, no memory effect, and no pollution. Therefore, the use of lithium battery power supply is the development trend of battery applications. In high-power applications, the battery cells are first connected in series to form a battery pack to increase the supply voltage, and then the battery packs are connected in parallel to increase the output power of the power supply. Both the single cell and the battery pack in series require a Battery Management System (BMS) monitoring management. The lithium battery pack and the BMS together form a lithium battery module.
- BMS Battery Management System
- Embodiments of the present invention provide a method and system for parallel use of a lithium battery module, which can reduce damage to the BMS circuit and improve the safety of the lithium battery module in parallel use.
- a method for parallel use of a lithium battery pack comprising:
- the voltage difference between each lithium battery module and the busbar is controlled according to the voltage equalization mode, and the lithium battery module having the smallest voltage difference from the busbar is sequentially connected to the busbar;
- a system for parallel use of a lithium battery module includes: one or more lithium battery modules and a main control unit; wherein the main control unit is configured to collect voltage values of the lithium battery modules at initial power-on, according to the collected information, according to the voltage equalization
- the method controls the voltage difference between each lithium battery module and the busbar, and sequentially connects the lithium battery module having the smallest voltage difference with the busbar to the busbar, and then simultaneously connects the lithium battery modules after the busbar is connected Discharge.
- the embodiment of the present invention controls the voltage difference between each lithium battery module and the busbar according to the voltage equalization mode, and sequentially connects the lithium battery module with the voltage difference between the busbar and the busbar to the busbar.
- the voltage difference of each lithium battery module can be kept within a certain range and then connected in parallel to reduce the voltage difference between the battery groups, thereby avoiding large current surge between the battery groups, thereby reducing damage to the BMS circuit and improving the parallel use of the lithium battery modules. safety.
- FIG. 1 is a schematic structural diagram of a method for controlling parallel use of a lithium battery module according to an embodiment of the present invention
- FIG. 2 is a structural block diagram of a system for controlling parallel use of a lithium battery module according to an embodiment of the present invention
- FIG. 3 is a charging equalization method according to Embodiment 1 of the present invention
- Schematic diagram of the parallel mode
- FIG. 4 is a schematic diagram of a parallel mode of discharge voltage equalization according to Embodiment 2 of the present invention.
- FIG. 5 is a schematic diagram of a charge and discharge cooperation parallel manner according to Embodiment 3 of the present invention.
- Figure 6 is a schematic diagram of a parallel method of charging current limiting.
- a method for parallel use of a lithium battery module according to an embodiment of the present invention includes:
- the voltage difference between each lithium battery module and the busbar is controlled according to the voltage equalization mode, and the lithium battery module having the smallest voltage difference from the busbar is sequentially connected to the busbar.
- a lithium battery module parallel use system provided by an embodiment of the present invention includes: one or more The lithium battery module and the main control unit; wherein, the main control unit is configured to collect the voltage values of the lithium battery modules at the initial power-on, and according to the collected information, the voltage difference between the lithium battery modules and the bus bars is controlled according to the voltage equalization mode. And sequentially, the lithium battery module having the smallest voltage difference from the busbar is connected to the busbar, and then the connected lithium battery modules are simultaneously charged and discharged.
- the lithium battery module parallel use system is mainly composed of a lithium battery module, a main control unit, a system power source, and a load, wherein the lithium battery module is composed of a battery pack and a BMS (battery management system).
- BMS battery management system
- the lithium battery module (101, 102, 103) is a backup power supply unit in the DC power supply system, which is used to discharge the system when the system is powered off, and keep the system working normally.
- the lithium battery module consists of a lithium battery pack and a BMS.
- Battery Management System BMS (201, 202, 203) is a device for managing lithium battery packs. It is used to detect the voltage and current of lithium battery packs and single cells, to determine abnormal conditions and to perform protection actions.
- the BMS can exchange information with the main control unit 401 through a communication interface such as serial port/network port/CAN/wireless/dry node/inter-module communication.
- the BMS can receive the control of the main control unit and perform the action of hooking up to the system power supply.
- the lithium battery pack (301, 302, 303) is a device for storing electrical energy, which is formed by connecting a single battery cell in series. Depending on the application scenario, large-capacity cells are connected in series, and small-capacity cells can be connected in parallel and then in series.
- the main control unit 401 is a device for performing data calculation and signal control processing, and performs collection of each BMS voltage, calculation of a voltage equalization algorithm, access of alarm data, and output of an alarm signal.
- the main control unit can be a stand-alone component or it can be stored in the BMS as software.
- the system power supply 501 is a DC output power supply unit, and the communication field is generally 48V DC.
- the system power supply acts as a device for charging the lithium battery pack and also supplies power to the load.
- the system power supply can control whether it is discharged externally.
- Load 601 which is a general term for electrical equipment, consumes electrical energy.
- the loads mentioned in this article are all DC powered devices.
- the busbar 701 is a convergence point of the system power supply, the lithium battery module, and the load.
- FIG. 2 only cites the case where three sets of lithium battery modules are connected in parallel.
- the method and system of the embodiments of the present invention can theoretically support an infinite number of sets of lithium battery modules in parallel.
- the working principle of the system in the embodiment of the present invention is as follows: During initial power-on, the main control unit 401 controls the BMS of each lithium battery module to disconnect the lithium battery module from the busbar, and reports the voltage value of the managed lithium battery module to the communication interface. The main control unit, according to the reported result, collects the voltage value of each lithium battery module at the initial power-on, controls the voltage difference between each lithium battery module and the busbar according to the voltage equalization mode, and sequentially connects the busbar with the busbar The lithium battery module with the smallest voltage difference is connected to the busbar, and then the lithium battery modules connected to the busbar are simultaneously charged and discharged.
- the voltage difference between each lithium battery module and the busbar is controlled according to the voltage equalization mode, so that the voltage difference of each lithium battery module is maintained within a certain range and then connected in parallel to reduce the battery pack.
- the voltage difference between the two groups avoids large current surge between the battery packs, thereby reducing the damage to the BMS circuit and improving the safety of the parallel use of the lithium battery modules.
- the main control unit controls the voltage difference between each lithium battery module and the busbar in a voltage equalization manner.
- Embodiment 1 Charging voltage equalization parallel mode
- FIG. 3 is a schematic diagram of a parallel mode of charging and voltage equalization according to the embodiment, including:
- the lithium battery module with the lowest voltage value is connected to the busbar for charging
- the BMS of all lithium battery modules disconnects the lithium battery module from the busbar, and is in a state of restlessness. At this time, the initial voltage value of the busbar is zero.
- Each BMS detects the voltage value of the lithium battery module it manages and reports it to the main control unit.
- the main control unit compares the voltage values of the lithium battery modules and sorts them.
- the BMS of the lowest lithium battery module (for example, 101) is connected to the busbar, and the lithium battery pack 301 is charged by the system power supply, and when the busbar voltage rises to the voltage value of the second lowest lithium battery module (for example, 102), The BMS of the second set of lithium battery modules is notified to be connected to the busbar, the lithium battery pack 302 is charged by the system power supply, and so on, until all the lithium battery modules are connected to the busbar.
- Embodiment 2 Parallel mode of discharge voltage equalization
- FIG. 4 is a schematic diagram of a parallel mode of discharge voltage equalization according to the embodiment, including:
- the lithium battery module with the highest voltage value is connected to the busbar for discharging
- the system structure diagram shown in Figure 1 is still taken as an example.
- the BMS of all lithium battery modules disconnects the lithium battery module from the busbar, and is in a state of restlessness. At this time, the initial voltage value of the busbar is zero.
- Each BMS detects the voltage value of the lithium battery module managed by the BMS and reports it to the main control unit.
- the main control unit compares the voltage values of the lithium battery modules and sorts them, first notifying the BMS of the highest voltage lithium battery module (for example, 101) to the busbar.
- the system power is disconnected, the lithium battery pack 301 is discharged, and when the busbar voltage drops to the voltage value of the second highest lithium battery module (for example, 102), the BMS of the second lithium battery module is notified to the mother.
- the busbar voltage drops to the voltage value of the second highest lithium battery module (for example, 102)
- the BMS of the second lithium battery module is notified to the mother.
- Embodiment 3 Charging and discharging voltage equalization parallel mode
- FIG. 5 is a schematic diagram of a parallel connection mode of charge and discharge voltage equalization according to the embodiment, including:
- the lithium battery module whose voltage value is lower than the average voltage value is sequentially connected to the busbar from low to high for charging, until the voltage value of the busbar rises to the average voltage value; S53, the lithium battery module whose voltage value is higher than the average voltage value is sequentially connected to the busbar from high to low for discharging until the voltage value of the busbar falls to the average voltage value.
- the lithium battery module whose voltage value is lower than the average voltage value is connected to the busbar from the lithium battery module with the lowest voltage value for charging, and when the voltage value of the busbar rises to the voltage value of the second lowest lithium battery module. And charging the second low lithium battery module into the busbar for charging, and so on, until the voltage value of the busbar rises to the average voltage value; and the lithium battery module having a voltage value higher than the average voltage value
- the lithium battery module with the highest voltage value starts to be connected to the busbar for discharging.
- the second high lithium battery module is connected to the busbar for discharging, Such a push until the voltage value of the busbar drops to the average voltage value.
- steps S52 and S53 have no specific order requirements, and may be performed simultaneously or in any step.
- the system power supply works, and the BMS of all the lithium battery modules disconnects the lithium battery module from the busbar, and is in a state of restlessness. At this time, the initial voltage value of the busbar is zero.
- Each BMS detects the voltage value of the lithium battery module it manages and reports it to the main control unit.
- the main control unit compares the voltage values of the lithium battery modules and sorts them to calculate the average voltage value.
- the lithium battery pack 301 voltage value ⁇ When the voltage value of the lithium battery pack 302 ⁇ average voltage value ⁇ the voltage value of the lithium battery pack 303, the lithium battery module 101 having the lowest voltage can be first connected to the busbar, and the lithium battery pack 301 can be charged by the system power source 501, and the busbar is arranged. When the voltage rises to the voltage value of the lithium battery pack 302, the lithium battery module 102 is notified to be connected to the busbar, and the lithium battery pack 302 is charged by the system power supply until the voltage value of the busbar rises to the average voltage value.
- the highest voltage lithium battery module 103 is notified to be connected to the busbar, and then the system power supply is disconnected, and the lithium battery pack 303 is discharged.
- the busbar voltage drops to the average voltage value, the system power supply is turned on in parallel. Each lithium battery module is charged and discharged.
- the main air unit of the embodiment of the present invention described above may be a separate component or may be present as a software function module in the battery management system BMS of each lithium battery module.
- a charge current limiting circuit is disposed in the BMS of at least one of the lithium battery modules.
- the charge and discharge circuits of each BMS are completely independent. Due to the limitation of the charging curve of the lithium battery, the limited current function in the charging circuit, before the parallel connection of the electric modules in the ⁇ !, the BMS is set to the charging state, because of the function of the current limiting, the large current surge can be further avoided.
- the positive junction point in Figure 6 is only a schematic diagram. In the actual system, it may be a negative current sink, or both the positive and negative poles are converging.
- the method and system for controlling the parallel use of the lithium battery modules provided by the embodiments of the present invention can be applied to all scenarios in which the lithium battery modules are connected in parallel.
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Abstract
A lithium battery module parallel using method and system are provided. The method comprises: collecting a voltage value of each lithium battery module when initially electrifying (S1); based on information collected, controlling a voltage difference between the lithium battery module and the bus in accordance with a voltage sharing mode and orderly inserting the lithium battery module with a minimal voltage difference into the bus (S2); charging or discharging the lithium battery module after the lithium battery module is inserted into the bus (S3). The method can maintain the voltage difference of the lithium battery module in a certain range for inserting the module in a parallel manner, reduce the voltage difference in the interior-group, avoid high current impact between the battery groups, reduce damages of the battery management system (BMS) circuit, and improve the safety of the lithium battery module by using parallelly.
Description
锂电模块并联使用方法及系统 本申请要求于 2010 年 12 月 31 日提交中国专利局、 申请号为 20101 0620101. 0、 发明名称为 "锂电模块并联使用方法及系统" 的中国专 利申请的优先权, 其全部内容通过引用结合在本申请中。 Method and system for parallel use of lithium battery module This application claims priority to Chinese patent application filed on December 31, 2010, the Chinese Patent Office, Application No. 20101 0620101. 0, the invention titled "Liquid Battery Module Parallel Use Method and System", The entire contents of this application are incorporated herein by reference.
技术领域 Technical field
本发明涉及一种锂电模块并联使用方法及系统。 背景技术 The invention relates to a method and a system for parallel use of lithium battery modules. Background technique
锂电池能量密度高、 单体电芯电压高、 寿命长、 无记忆效应, 无污染, 因此采用锂电池供电是电池应用的发展趋势。 在大功率应用中, 首先需要单 体电芯串联组成电池组来提高供电电压, 然后电池组再并联来提高供电的输 出功率。 单体电芯和串联后的电池组都需要电池管理系统 ( Battery Management System, BMS )监控管理。 锂电池组和 BMS共同组成锂电模块。 Lithium batteries have high energy density, high single cell voltage, long life, no memory effect, and no pollution. Therefore, the use of lithium battery power supply is the development trend of battery applications. In high-power applications, the battery cells are first connected in series to form a battery pack to increase the supply voltage, and then the battery packs are connected in parallel to increase the output power of the power supply. Both the single cell and the battery pack in series require a Battery Management System (BMS) monitoring management. The lithium battery pack and the BMS together form a lithium battery module.
锂电模块并联使用存在的主要问题是组间大电流冲击。 由于各电池组电 压不同, 直接并联, 在汇聚点会有一个电压平衡的过程。 在这个过程中, 由 The main problem with the parallel use of lithium battery modules is the large current surge between groups. Since the voltages of the battery packs are different and directly connected in parallel, there is a process of voltage balance at the convergence point. In the process, by
会导致 BMS电路损坏。 发明内容 This can cause damage to the BMS circuit. Summary of the invention
本发明实施例提供了一种锂电模块并联使用方法及系统, 能够减少对 BMS电路的损坏, 提高锂电模块并联使用的安全性。 Embodiments of the present invention provide a method and system for parallel use of a lithium battery module, which can reduce damage to the BMS circuit and improve the safety of the lithium battery module in parallel use.
本发明实施例采用如下技术方案: The embodiment of the invention adopts the following technical solutions:
一种锂电池组并联使用方法, 包括: A method for parallel use of a lithium battery pack, comprising:
收集初始上电时各锂电模块的电压值; Collecting voltage values of the respective lithium battery modules at initial power-on;
根据收集的信息, 按照均压方式控制各锂电模块与母排之间的电压差值, 并依次把与母排之间的电压差值最小的锂电模块接入母排; According to the collected information, the voltage difference between each lithium battery module and the busbar is controlled according to the voltage equalization mode, and the lithium battery module having the smallest voltage difference from the busbar is sequentially connected to the busbar;
对接入母排后的所述各锂电模块同时充放电。
一种锂电模块并联使用系统, 包括: 一个以上的锂电模块、 主控单元; 其中, 所述主控单元, 用于收集初始上电时各锂电模块的电压值, 根据收集 的信息, 按照均压方式控制各锂电模块与母排之间的电压差值, 并依次把与 母排之间的电压差值最小的锂电模块接入母排, 然后对接入母排后的所述各 锂电模块同时充放电。 The lithium battery modules after accessing the busbar are simultaneously charged and discharged. A system for parallel use of a lithium battery module includes: one or more lithium battery modules and a main control unit; wherein the main control unit is configured to collect voltage values of the lithium battery modules at initial power-on, according to the collected information, according to the voltage equalization The method controls the voltage difference between each lithium battery module and the busbar, and sequentially connects the lithium battery module having the smallest voltage difference with the busbar to the busbar, and then simultaneously connects the lithium battery modules after the busbar is connected Discharge.
由上述技术方案可知, 本发明实施例通过按照均压方式控制各锂电模块 与母排之间的电压差值, 并依次把与母排之间的电压差值最小的锂电模块接 入母排, 可以使各锂电模块的电压差保持在一定范围内再接入并联, 以降低 电池组之间的电压差, 避免电池组间大电流冲击, 从而能够减少对 BMS电路 损坏, 提高锂电模块并联使用的安全性。 According to the above technical solution, the embodiment of the present invention controls the voltage difference between each lithium battery module and the busbar according to the voltage equalization mode, and sequentially connects the lithium battery module with the voltage difference between the busbar and the busbar to the busbar. The voltage difference of each lithium battery module can be kept within a certain range and then connected in parallel to reduce the voltage difference between the battery groups, thereby avoiding large current surge between the battery groups, thereby reducing damage to the BMS circuit and improving the parallel use of the lithium battery modules. safety.
附图说明 DRAWINGS
下面对本发明描述中所需要使用的附图作一筒单地介绍。 The drawings used in the description of the present invention are briefly described below.
图 1为本发明实施例提供的控制锂电模块并联使用的方法示意图; 图 2为本发明实施例提供的控制锂电模块并联使用的系统的结构框图; 图 3为本发明实施例一的充电均压并联方式的示意图; 1 is a schematic structural diagram of a method for controlling parallel use of a lithium battery module according to an embodiment of the present invention; FIG. 2 is a structural block diagram of a system for controlling parallel use of a lithium battery module according to an embodiment of the present invention; FIG. 3 is a charging equalization method according to Embodiment 1 of the present invention; Schematic diagram of the parallel mode;
图 4为本发明实施例二的放电均压并联方式的示意图; 4 is a schematic diagram of a parallel mode of discharge voltage equalization according to Embodiment 2 of the present invention;
图 5为本发明实施例三的充放电配合并联方式的示意图; FIG. 5 is a schematic diagram of a charge and discharge cooperation parallel manner according to Embodiment 3 of the present invention; FIG.
图 6为充电限流并联方式的示意图。 Figure 6 is a schematic diagram of a parallel method of charging current limiting.
具体实施方式 detailed description
下面结合附图及实施例, 对本发明的技术方案进行清楚、 完整地描述。 参见图 1, 本发明实施例提供的锂电模块并联使用方法, 包括: The technical solutions of the present invention are clearly and completely described below in conjunction with the accompanying drawings and embodiments. Referring to FIG. 1, a method for parallel use of a lithium battery module according to an embodiment of the present invention includes:
511 , 收集初始上电时各锂电模块的电压值。 511. Collect voltage values of the respective lithium battery modules at the initial power-on.
512, 根据收集的信息, 按照均压方式控制各锂电模块与母排之间的电压 差值, 并依次把与母排之间的电压差值最小的锂电模块接入母排。 512. According to the collected information, the voltage difference between each lithium battery module and the busbar is controlled according to the voltage equalization mode, and the lithium battery module having the smallest voltage difference from the busbar is sequentially connected to the busbar.
513 , 对接入母排后的所述各锂电模块同时充放电。 513. Simultaneously charge and discharge each of the lithium battery modules after accessing the busbar.
参见图 2, 本发明实施例提供的锂电模块并联使用系统, 包括: 一个以上
的锂电模块、 主控单元; 其中, 主控单元用于收集初始上电时各锂电模块的 电压值, 根据收集的信息, 按照均压方式控制各锂电模块与母排之间的电压 差值, 并依次把与母排之间的电压差值最小的锂电模块接入母排, 然后对接 入后的所述各锂电模块同时充放电。 Referring to FIG. 2, a lithium battery module parallel use system provided by an embodiment of the present invention includes: one or more The lithium battery module and the main control unit; wherein, the main control unit is configured to collect the voltage values of the lithium battery modules at the initial power-on, and according to the collected information, the voltage difference between the lithium battery modules and the bus bars is controlled according to the voltage equalization mode. And sequentially, the lithium battery module having the smallest voltage difference from the busbar is connected to the busbar, and then the connected lithium battery modules are simultaneously charged and discharged.
具体地, 锂电模块并联使用系统主要由锂电模块、 主控单元、 系统电源、 负载组成, 其中锂电模块由电池组和 BMS (电池管理系统)组成。 各个组成 部分的功能如下: Specifically, the lithium battery module parallel use system is mainly composed of a lithium battery module, a main control unit, a system power source, and a load, wherein the lithium battery module is composed of a battery pack and a BMS (battery management system). The functions of each component are as follows:
锂电模块 (101、 102、 103 ), 是直流电源系统中的一种后备电源装置, 用于在系统停电时对外放电,保持系统正常工作。锂电模块由锂电池组和 BMS 组成。 The lithium battery module (101, 102, 103) is a backup power supply unit in the DC power supply system, which is used to discharge the system when the system is powered off, and keep the system working normally. The lithium battery module consists of a lithium battery pack and a BMS.
电池管理系统 BMS ( 201、 202、 203 ), 是一种管理锂电池组的装置, 用 于检测锂电池组和单体电芯的电压、 电流, 判断异常情况并做出保护动作。 BMS 可以通过串口 /网口 /CAN/无线 /干节点 /模块间通信等通信接口与主控单 元 401进行信息交互。 在本发明实施例系统中, BMS可以接收主控单元的控 制, 执行挂接到系统电源的动作。 Battery Management System BMS (201, 202, 203) is a device for managing lithium battery packs. It is used to detect the voltage and current of lithium battery packs and single cells, to determine abnormal conditions and to perform protection actions. The BMS can exchange information with the main control unit 401 through a communication interface such as serial port/network port/CAN/wireless/dry node/inter-module communication. In the system of the embodiment of the present invention, the BMS can receive the control of the main control unit and perform the action of hooking up to the system power supply.
锂电池组 (301、 302、 303 ), 是一种存储电能的装置, 由单节电芯串联 而成。 根据应用场景的不同, 大容量的电芯直接串联, 小容量的电芯可以先 并联然后串联。 The lithium battery pack (301, 302, 303) is a device for storing electrical energy, which is formed by connecting a single battery cell in series. Depending on the application scenario, large-capacity cells are connected in series, and small-capacity cells can be connected in parallel and then in series.
主控单元 401, 是进行数据运算和信号控制处理的装置, 完成各 BMS电 压的收集、 均压算法的运算、 告警数据的存取以及告警信号的输出功能。 主 控单元可以是一个独立的部件, 也可以作为软件存在于 BMS中。 The main control unit 401 is a device for performing data calculation and signal control processing, and performs collection of each BMS voltage, calculation of a voltage equalization algorithm, access of alarm data, and output of an alarm signal. The main control unit can be a stand-alone component or it can be stored in the BMS as software.
系统电源 501, 是一种直流输出的电源装置, 通信领域一般为 48V直流。 在发明实施例系统中, 系统电源作为给锂电池组充电的设备, 同时也给负载 供电。 系统电源可以控制是否对外放电。 The system power supply 501 is a DC output power supply unit, and the communication field is generally 48V DC. In the system of the inventive embodiment, the system power supply acts as a device for charging the lithium battery pack and also supplies power to the load. The system power supply can control whether it is discharged externally.
负载 601, 是用电设备的统称, 消耗电能。 本文所提到的负载, 都是直流 供电设备。
母排 701, 是系统电源、 锂电模块、 负载的汇聚点。 Load 601, which is a general term for electrical equipment, consumes electrical energy. The loads mentioned in this article are all DC powered devices. The busbar 701 is a convergence point of the system power supply, the lithium battery module, and the load.
可以理解的是, 图 2仅列举了三组锂电模块并联的情形, 本发明实施例 的方法和系统理论上可以支持无限多组锂电模块并联。 It can be understood that FIG. 2 only cites the case where three sets of lithium battery modules are connected in parallel. The method and system of the embodiments of the present invention can theoretically support an infinite number of sets of lithium battery modules in parallel.
本发明实施例的系统工作原理如下: 初始上电时, 主控单元 401 控制各 锂电模块的 BMS断开锂电模块与母排的连接, 并将所管理的锂电模块的电压 值通过通信接口上报给主控单元, 主控单元根据上报结果, 收集初始上电时 各锂电模块的电压值, 按照均压方式控制各锂电模块与母排之间的电压差值, 并依次把与母排之间的电压差值最小的锂电模块接入母排, 然后对接入母排 后的所述各锂电模块同时充放电。 The working principle of the system in the embodiment of the present invention is as follows: During initial power-on, the main control unit 401 controls the BMS of each lithium battery module to disconnect the lithium battery module from the busbar, and reports the voltage value of the managed lithium battery module to the communication interface. The main control unit, according to the reported result, collects the voltage value of each lithium battery module at the initial power-on, controls the voltage difference between each lithium battery module and the busbar according to the voltage equalization mode, and sequentially connects the busbar with the busbar The lithium battery module with the smallest voltage difference is connected to the busbar, and then the lithium battery modules connected to the busbar are simultaneously charged and discharged.
由本发明实施例的上述技术可知, 通过按照均压方式控制各锂电模块与 母排之间的电压差值, 使得各锂电模块的电压差保持在一定范围内再接入并 联, 以降低电池组之间的电压差, 避免电池组间大电流冲击, 从而能够减少 对 BMS电路损坏, 提高锂电模块并联使用的安全性。 According to the above technique of the embodiment of the present invention, the voltage difference between each lithium battery module and the busbar is controlled according to the voltage equalization mode, so that the voltage difference of each lithium battery module is maintained within a certain range and then connected in parallel to reduce the battery pack. The voltage difference between the two groups avoids large current surge between the battery packs, thereby reducing the damage to the BMS circuit and improving the safety of the parallel use of the lithium battery modules.
下面采用实施例, 对主控单元按照均压方式控制各锂电模块与母排之间 的电压差值的方式进行说明。 Hereinafter, an embodiment will be described in which the main control unit controls the voltage difference between each lithium battery module and the busbar in a voltage equalization manner.
实施例一: 充电均压并联方式 Embodiment 1: Charging voltage equalization parallel mode
参见图 3, 图 3为本实施例的充电均压并联方式的示意图, 包括: Referring to FIG. 3, FIG. 3 is a schematic diagram of a parallel mode of charging and voltage equalization according to the embodiment, including:
531 , 对未接入母排的各锂电模块的电压值由低到高进行排序; 531. Sort the voltage values of the lithium battery modules that are not connected to the busbar from low to high;
532, 根据排序结果, 将电压值最低的锂电模块接入母排进行充电; 532. According to the sorting result, the lithium battery module with the lowest voltage value is connected to the busbar for charging;
533 , 当母排的电压值上升到第二低的锂电模块的电压值时, 将所述第二 低的锂电模块接入母排进行充电; 533, when the voltage value of the busbar rises to the voltage value of the second lowest lithium battery module, the second low lithium battery module is connected to the busbar for charging;
534, 以此类推, 直至所有的锂电模块都接入母排。 534, and so on, until all lithium battery modules are plugged into the busbar.
以图 2所示的系统结构图为例进行说明, 在初始上电时, 系统电源工作, 所有锂电模块的 BMS都断开锂电模块与母排的连接, 处于不充不放的静置状 态, 此时母排的初始电压值为零。 各 BMS检测其所管理的锂电模块的电压值 上报给主控单元, 由主控单元比较各锂电模块的电压值并排序, 先通知电压
最低的锂电模块(例如 101 ) 的 BMS接入到母排上, 由系统电源对锂电池组 301进行充电,等母排电压上升到第二低的锂电模块(例如 102 )的电压值时, 再通知第二组锂电模块的 BMS接入到母排上, 由系统电源对锂电池组 302进 行充电, 以此类推, 直到所有的锂电模块都接入到母排上。 Take the system structure diagram shown in Figure 2 as an example. When the system is powered on initially, the system power supply works. The BMS of all lithium battery modules disconnects the lithium battery module from the busbar, and is in a state of restlessness. At this time, the initial voltage value of the busbar is zero. Each BMS detects the voltage value of the lithium battery module it manages and reports it to the main control unit. The main control unit compares the voltage values of the lithium battery modules and sorts them. The BMS of the lowest lithium battery module (for example, 101) is connected to the busbar, and the lithium battery pack 301 is charged by the system power supply, and when the busbar voltage rises to the voltage value of the second lowest lithium battery module (for example, 102), The BMS of the second set of lithium battery modules is notified to be connected to the busbar, the lithium battery pack 302 is charged by the system power supply, and so on, until all the lithium battery modules are connected to the busbar.
实施例二: 放电均压并联方式 Embodiment 2: Parallel mode of discharge voltage equalization
参见图 4, 图 4为本实施例的放电均压并联方式的示意图, 包括: Referring to FIG. 4, FIG. 4 is a schematic diagram of a parallel mode of discharge voltage equalization according to the embodiment, including:
541 , 对未接入母排的各锂电模块的电压值由高到低进行排序; 541. Sort the voltage values of the lithium battery modules that are not connected to the busbar from high to low;
542, 根据排序结果, 将电压值最高的锂电模块接入母排进行放电; 542. According to the sorting result, the lithium battery module with the highest voltage value is connected to the busbar for discharging;
543 , 当母排的电压值下降到第二高的锂电模块的电压值时, 将所述第二 高的锂电模块接入母排进行放电; 543, when the voltage value of the busbar drops to the voltage value of the second highest lithium battery module, the second high lithium battery module is connected to the busbar for discharging;
544, 以此类推, 直至所有的锂电模块都接入母排。 实现上面有些小的差别。 仍以图 1所示的系统结构图为例进行说明, 在初始 上电时,系统电源工作,所有锂电模块的 BMS都断开锂电模块与母排的连接, 处于不充不放的静置状态, 此时母排的初始电压值为零。 各 BMS检测其所管 理的锂电模块的电压值上报给主控单元, 由主控单元比较各锂电模块的电压 值并排序, 先通知电压最高的锂电模块(例如 101 ) 的 BMS接入到母排上, 然后断开系统电源, 对锂电池组 301 进行放电, 等母排电压下降到第二高的 锂电模块(例如 102 ) 的电压值时, 再通知第二组锂电模块的 BMS接入到母 排上, 断开系统电源对锂电池组 302进行放电, 以此类推, 直到所有的锂电 模块都接入到母排上。 然后再开启系统电源对并联的各锂电模块进行充放电。 544, and so on, until all lithium battery modules are plugged into the busbar. Achieve some small differences. The system structure diagram shown in Figure 1 is still taken as an example. When the system is powered on initially, the system power supply works. The BMS of all lithium battery modules disconnects the lithium battery module from the busbar, and is in a state of restlessness. At this time, the initial voltage value of the busbar is zero. Each BMS detects the voltage value of the lithium battery module managed by the BMS and reports it to the main control unit. The main control unit compares the voltage values of the lithium battery modules and sorts them, first notifying the BMS of the highest voltage lithium battery module (for example, 101) to the busbar. Then, the system power is disconnected, the lithium battery pack 301 is discharged, and when the busbar voltage drops to the voltage value of the second highest lithium battery module (for example, 102), the BMS of the second lithium battery module is notified to the mother. On the top, disconnect the system power to discharge the lithium battery pack 302, and so on, until all the lithium battery modules are connected to the busbar. Then turn on the system power to charge and discharge each lithium battery module in parallel.
实施例三: 充放电均压并联方式 Embodiment 3: Charging and discharging voltage equalization parallel mode
参见图 5, 图 5为本实施例的充放电均压并联方式的示意图, 包括: Referring to FIG. 5, FIG. 5 is a schematic diagram of a parallel connection mode of charge and discharge voltage equalization according to the embodiment, including:
551 , 计算出未接入母排的各锂电模块的电压值的平均电压值; 551. Calculate an average voltage value of voltage values of each lithium battery module that is not connected to the busbar;
552, 将电压值低于所述平均电压值的锂电模块由低到高依次接入母排进 行充电, 直至母排的电压值上升到所述平均电压值;
S53 , 将电压值高于所述平均电压值的锂电模块由高到低依次接入母排进 行放电, 直至母排的电压值下降到所述平均电压值。 552, the lithium battery module whose voltage value is lower than the average voltage value is sequentially connected to the busbar from low to high for charging, until the voltage value of the busbar rises to the average voltage value; S53, the lithium battery module whose voltage value is higher than the average voltage value is sequentially connected to the busbar from high to low for discharging until the voltage value of the busbar falls to the average voltage value.
具体地, 将电压值低于所述平均电压值的锂电模块, 从电压值最低的锂 电模块开始接入母排进行充电, 当母排的电压值上升到第二低的锂电模块的 电压值时, 将所述第二低的锂电模块接入母排进行充电, 以此类推, 直至母 排的电压值上升到所述平均电压值; 将电压值高于所述平均电压值的锂电模 块, 从电压值最高的锂电模块开始接入母排进行放电, 当母排的电压值下降 到第二高的锂电模块的电压值时, 将所述第二高的锂电模块接入母排进行放 电, 以此类推, 直至母排的电压值下降到所述平均电压值。 Specifically, the lithium battery module whose voltage value is lower than the average voltage value is connected to the busbar from the lithium battery module with the lowest voltage value for charging, and when the voltage value of the busbar rises to the voltage value of the second lowest lithium battery module. And charging the second low lithium battery module into the busbar for charging, and so on, until the voltage value of the busbar rises to the average voltage value; and the lithium battery module having a voltage value higher than the average voltage value The lithium battery module with the highest voltage value starts to be connected to the busbar for discharging. When the voltage value of the busbar drops to the voltage value of the second highest lithium battery module, the second high lithium battery module is connected to the busbar for discharging, Such a push until the voltage value of the busbar drops to the average voltage value.
其中, 上述步骤 S52与步骤 S53无特定次序要求, 可以同时进行, 也可 以任一步骤先进行。 The above steps S52 and S53 have no specific order requirements, and may be performed simultaneously or in any step.
仍以图 1所示的系统结构图为例进行说明, 在初始上电时, 系统电源工 作, 所有锂电模块的 BMS都断开锂电模块与母排的连接, 处于不充不放的静 置状态, 此时母排的初始电压值为零。 各 BMS检测其所管理的锂电模块的电 压值上报给主控单元, 由主控单元比较各锂电模块的电压值并排序, 计算出 平均电压值, 若比较结果为: 锂电池组 301 电压值 <锂电池组 302电压值 <平 均电压值<锂电池组 303电压值, 则可以先将电压最低的锂电模块 101接入到 母排上, 由系统电源 501对锂电池组 301进行充电, 等母排电压上升到锂电 池组 302电压值时, 再通知锂电模块 102接入到母排上, 由系统电源对锂电 池组 302进行充电, 直到母排的电压值上升到所述平均电压值。 然后再通知 电压最高的锂电模块 103接入到母排上, 然后断开系统电源,对锂电池组 303 进行放电, 等母排电压下降到所述平均电压值时, 再开启系统电源对并联的 各锂电模块进行充放电。 Still taking the system structure diagram shown in Figure 1 as an example, when the system is powered on initially, the system power supply works, and the BMS of all the lithium battery modules disconnects the lithium battery module from the busbar, and is in a state of restlessness. At this time, the initial voltage value of the busbar is zero. Each BMS detects the voltage value of the lithium battery module it manages and reports it to the main control unit. The main control unit compares the voltage values of the lithium battery modules and sorts them to calculate the average voltage value. If the comparison result is: The lithium battery pack 301 voltage value < When the voltage value of the lithium battery pack 302 < average voltage value < the voltage value of the lithium battery pack 303, the lithium battery module 101 having the lowest voltage can be first connected to the busbar, and the lithium battery pack 301 can be charged by the system power source 501, and the busbar is arranged. When the voltage rises to the voltage value of the lithium battery pack 302, the lithium battery module 102 is notified to be connected to the busbar, and the lithium battery pack 302 is charged by the system power supply until the voltage value of the busbar rises to the average voltage value. Then, the highest voltage lithium battery module 103 is notified to be connected to the busbar, and then the system power supply is disconnected, and the lithium battery pack 303 is discharged. When the busbar voltage drops to the average voltage value, the system power supply is turned on in parallel. Each lithium battery module is charged and discharged.
需要说明的是, 上述实施例一至实施例三, 在实际逻辑控制时, 当有锂 电池组与母排之间的电压差值小于一定范围 (该差值范围根据测试情况而定, 一般设置为 ± 0.5V ), 则通知 BMS挂接该锂电模块, 然后判断锂电模块是否
全部挂接完成。 如果没有全部挂接完成, 则继续等待电池充电或放电, 直到 所有的锂电模块都挂接到母排上 fi 然后由主控单元控制系统电源对接入母排 后的各锂电模块同时充放电。 It should be noted that, in the foregoing Embodiments 1 to 3, when the actual logic is controlled, when the voltage difference between the lithium battery pack and the busbar is less than a certain range (the difference range is determined according to the test condition, generally set to ± 0.5V ), then inform the BMS to attach the lithium battery module, and then determine whether the lithium battery module is All hooks are completed. If not all hook complete, the charging or discharging of the battery continues to wait until all the modules are attached to the lithium busbars fi system is then controlled by the master unit to each power module the access lithium busbar simultaneously charge and discharge.
上述本发明实施例的主 ·!空单元可以是一个独立的部件, 也可以作为软件 功能模块存在于各锂电模块的电池管理系统 BMS中。 The main air unit of the embodiment of the present invention described above may be a separate component or may be present as a software function module in the battery management system BMS of each lithium battery module.
进一步地, 本发明上述实施例的各锂电模块, 其中至少一个锂电模块的 BMS中设置有充电限流电路。 如图 6所示, 对设置有充电限流电路的 BMS, 每个 BMS的充放电电路完全独立。 由于锂电池充电曲线的限制, 充电电路中 有限流功能, 在^!里电模块并联之前, BMS设置为充电状态, 因为限流的功能, 从而可以进一步避免大电流冲击。 需要说明的是, 图 6 中的正极汇流点只是 示意, 实际系统中可能是负极汇流, 或者正负极都汇流。 Further, in each of the lithium battery modules of the above embodiments of the present invention, a charge current limiting circuit is disposed in the BMS of at least one of the lithium battery modules. As shown in Fig. 6, for the BMS provided with the charge current limiting circuit, the charge and discharge circuits of each BMS are completely independent. Due to the limitation of the charging curve of the lithium battery, the limited current function in the charging circuit, before the parallel connection of the electric modules in the ^!, the BMS is set to the charging state, because of the function of the current limiting, the large current surge can be further avoided. It should be noted that the positive junction point in Figure 6 is only a schematic diagram. In the actual system, it may be a negative current sink, or both the positive and negative poles are converging.
本发明实施例提供的控制锂电模块并联使用的方法及系统能够应用到所 有需要锂电模块并联的场景。 The method and system for controlling the parallel use of the lithium battery modules provided by the embodiments of the present invention can be applied to all scenarios in which the lithium battery modules are connected in parallel.
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并不局限 于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易 想到变化或替换, 都应涵盖在本发—明的保护范围之内。 因此, 本发明的保护 范围应该以权利要求的保护范围为准。
The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of this issue. Therefore, the scope of the invention should be determined by the scope of the claims.
Claims
1、 一种锂电模块并联使用方法, 其特征在于, 包括: A method for parallel use of a lithium battery module, characterized in that it comprises:
收集初始上电时各锂电模块的电压值; Collecting voltage values of the respective lithium battery modules at initial power-on;
根据收集的信息, 按照均压方式控制各锂电模块与母排之间的电压差值, 并依次把与母排之间的电压差值最小的锂电模块接入母排; According to the collected information, the voltage difference between each lithium battery module and the busbar is controlled according to the voltage equalization mode, and the lithium battery module having the smallest voltage difference from the busbar is sequentially connected to the busbar;
对接入母排后的所述各锂电模块同时充放电。 The lithium battery modules after accessing the busbar are simultaneously charged and discharged.
2、 根据权利要求 1所述的方法, 其特征在于, 所述收集初始上电时各锂电 模块的电压值包括: 2. The method according to claim 1, wherein the collecting the voltage values of the respective lithium battery modules at the initial power-on comprises:
初始上电时, 各锂电模块的电池管理系统断开锂电模块与母排的连接, 并 将所管理的锂电模块的电压值通过通信接口进行上报; At the initial power-on, the battery management system of each lithium battery module disconnects the lithium battery module from the busbar, and reports the voltage value of the managed lithium battery module through the communication interface;
根据所述各锂电模块的电池管理系统的上报结果, 收集初始上电时各锂电 模块的电压值。 According to the reported result of the battery management system of each of the lithium battery modules, the voltage values of the respective lithium battery modules at the time of initial power-on are collected.
3、根据权利要求 2所述的方法, 其特征在于, 所述通信接口为如下任一种: 串口、 网口、 CAN、 无线、 干节点或模块间通信接口。 The method according to claim 2, wherein the communication interface is any one of the following: a serial port, a network port, a CAN, a wireless, a dry node, or an inter-module communication interface.
4、 根据权利要求 1所述的方法, 其特征在于, 所述根据收集的信息, 按照 均压方式控制各锂电模块与母排之间的电压差值, 并依次把与母排之间的电压 差值最小的锂电模块接入母排包括: The method according to claim 1, wherein the voltage difference between each lithium battery module and the busbar is controlled according to the collected information, and the voltage between the busbar and the busbar is sequentially The lithium battery module with the smallest difference is connected to the busbar:
对未接入母排的各锂电模块的电压值由低到高进行排序; Sorting the voltage values of the lithium battery modules that are not connected to the busbar from low to high;
根据排序结果, 将电压值最低的锂电模块接入母排进行充电; According to the sorting result, the lithium battery module with the lowest voltage value is connected to the busbar for charging;
当母排的电压值上升到第二低的锂电模块的电压值时, 将所述第二低的锂 电模块接入母排进行充电; When the voltage value of the busbar rises to the voltage value of the second lowest lithium battery module, the second low lithium battery module is connected to the busbar for charging;
以此类推, 直至所有的锂电模块都接入母排。 And so on, until all lithium battery modules are connected to the busbar.
5、 根据权利要求 1所述的方法, 其特征在于, 所述根据收集的信息, 按照 均压方式控制各锂电模块与母排之间的电压差值, 并依次把与母排之间的电压 差值最小的锂电模块接入母排包括: The method according to claim 1, wherein the voltage difference between each lithium battery module and the busbar is controlled according to the collected information, and the voltage between the busbar and the busbar is sequentially The lithium battery module with the smallest difference is connected to the busbar:
对未接入母排的各锂电模块的电压值由高到低进行排序; 根据排序结果, 将电压值最高的锂电模块接入母排进行放电; Sorting the voltage values of the lithium battery modules that are not connected to the busbar from high to low; According to the sorting result, the lithium battery module with the highest voltage value is connected to the busbar for discharging;
当母排的电压值下降到第二高的锂电模块的电压值时, 将所述第二高的锂 电模块接入母排进行放电; When the voltage value of the busbar drops to the voltage value of the second highest lithium battery module, the second high lithium battery module is connected to the busbar for discharging;
以此类推, 直至所有的锂电模块都接入母排。 And so on, until all lithium battery modules are connected to the busbar.
6、 根据权利要求 1所述的方法, 其特征在于, 所述根据收集的信息, 按照 均压方式控制各锂电模块与母排之间的电压差值, 并依次把与母排之间的电压 差值最小的锂电模块接入母排包括: The method according to claim 1, wherein the voltage difference between each lithium battery module and the busbar is controlled according to the collected information, and the voltage between the busbar and the busbar is sequentially The lithium battery module with the smallest difference is connected to the busbar:
计算出未接入母排的各锂电模块的电压值的平均电压值; Calculating an average voltage value of voltage values of each lithium battery module that is not connected to the busbar;
将电压值低于所述平均电压值的锂电模块由低到高依次接入母排进行充 电, 直至母排的电压值上升到所述平均电压值; And charging the lithium battery module whose voltage value is lower than the average voltage value into the busbar from low to high for charging until the voltage value of the busbar rises to the average voltage value;
将电压值高于所述平均电压值的锂电模块由高到低依次接入母排进行放 电, 直至母排的电压值下降到所述平均电压值。 The lithium battery modules having a voltage value higher than the average voltage value are sequentially connected to the busbar from high to low for discharging until the voltage value of the busbar drops to the average voltage value.
7、 根据权利要求 6所述的方法, 其特征在于, 7. The method of claim 6 wherein:
所述将电压值低于所述平均电压值的锂电模块由低到高依次接入母排进行 充电, 直至母排的电压值上升到所述平均电压值包括: And charging the lithium battery module whose voltage value is lower than the average voltage value into the busbar from low to high for charging until the voltage value of the busbar rises to the average voltage value comprises:
将电压值最低的锂电模块接入母排进行充电, 当母排的电压值上升到第二 低的锂电模块的电压值时, 将所述第二低的锂电模块接入母排进行充电, 以此 类推, 直至母排的电压值上升到所述平均电压值; The lithium battery module with the lowest voltage value is connected to the busbar for charging. When the voltage value of the busbar rises to the voltage value of the second lowest lithium battery module, the second low lithium battery module is connected to the busbar for charging, Such a push until the voltage value of the busbar rises to the average voltage value;
所述将电压值高于所述平均电压值的锂电模块由高到低依次接入母排进行 放电, 直至母排的电压值下降到所述平均电压值包括: The lithium battery module having a voltage value higher than the average voltage value is sequentially connected to the busbar from high to low for discharging, until the voltage value of the busbar drops to the average voltage value, including:
将电压值最高的锂电模块接入母排进行放电, 当母排的电压值下降到第二 高的锂电模块的电压值时, 将所述第二高的锂电模块接入母排进行放电, 以此 类推, 直至母排的电压值下降到所述平均电压值。 Discharging the lithium battery module with the highest voltage value into the busbar for discharging. When the voltage value of the busbar drops to the voltage value of the second highest lithium battery module, the second high lithium battery module is connected to the busbar for discharging, Such a push until the voltage value of the busbar drops to the average voltage value.
8、 根据权利要求 1-7任一项所述的方法, 其特征在于, 在至少一个所述锂 电模块的电池管理系统中设置充电限流电路。 8. A method according to any one of claims 1-7, characterized in that a charging current limiting circuit is provided in the battery management system of at least one of the lithium battery modules.
9、 一种锂电模块并联使用的系统, 其特征在于, 包括: 一个以上的锂电模 块、 主控单元; 其中, 9. A system in which lithium battery modules are used in parallel, characterized in that it comprises: one or more lithium electric modes Block, main control unit;
所述主控单元, 用于收集初始上电时各锂电模块的电压值, 根据收集的信 息, 按照均压方式控制各锂电模块与母排之间的电压差值, 并依次把与母排之 间的电压差值最小的锂电模块接入母排, 然后对接入母排后的所述各锂电模块 同时充放电。 The main control unit is configured to collect voltage values of the lithium battery modules at the initial power-on, and according to the collected information, control the voltage difference between the lithium battery modules and the busbars according to the voltage equalization mode, and sequentially and the busbars The lithium battery module with the smallest voltage difference is connected to the busbar, and then the lithium battery modules after the busbar are connected are simultaneously charged and discharged.
10、 根据权利要求 9所述的系统, 其特征在于, 所述主控单元按照均压方 式控制各锂电模块与母排之间的电压差值的方式包括如下任一种: 10. The system according to claim 9, wherein the manner in which the main control unit controls the voltage difference between each of the lithium battery modules and the busbars according to the voltage equalization method comprises any one of the following:
充电均压、 放电均压、 或充放电均压的方式。 Charge equalization, discharge equalization, or charge and discharge equalization.
11、 根据权利要求 9或 10所述的系统, 其特征在于, 所述主控单元为一个 独立的部件, 或者所述主控单元作为软件功能模块存在于各锂电模块的电池管 理系统中。 The system according to claim 9 or 10, wherein the main control unit is a separate component, or the main control unit is present as a software function module in a battery management system of each lithium battery module.
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