CN204538723U - Flexible battery management system - Google Patents
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- BNOODXBBXFZASF-UHFFFAOYSA-N [Na].[S] Chemical compound [Na].[S] BNOODXBBXFZASF-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 229910018095 Ni-MH Inorganic materials 0.000 claims 2
- 229910018477 Ni—MH Inorganic materials 0.000 claims 2
- 239000004065 semiconductor Substances 0.000 claims 2
- 238000004146 energy storage Methods 0.000 abstract description 4
- 230000002457 bidirectional effect Effects 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
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- 229910052987 metal hydride Inorganic materials 0.000 description 2
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- 239000003990 capacitor Substances 0.000 description 1
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- 238000009499 grossing Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 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
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Abstract
柔性电池管理系统属于电池管理和储能领域，可以实现灵活的对电池组的电池进行测量、保护、管理，对外部的电压要求低，甚至可以直接与交流电相连。其是由多个电池管理单元串并联组成；每个电池管理单元包括一个或两个电池，4个或6个开关，可以实现对外的端口正接、反接、旁路等功能；其中开关可以是二极管、三极管、继电器、晶闸管、可控硅、MOS管和IGBT中的任意一种，还可以是由其组合而成的双向开关模块或器件；柔性电池管理系统可以由多个所述的电池管理单元串联、并联、串联再并联、并联再串联、或者串并联混合组成。该系统对外部充放电电压要求低，甚至可以实现外部交流电的充放电，并且本实用新型还可以提高电池组的可靠性，可以很容易和准确的测量其内阻。
The flexible battery management system belongs to the field of battery management and energy storage. It can flexibly measure, protect, and manage the batteries of the battery pack. It has low requirements for external voltage and can even be directly connected to AC power. It is composed of multiple battery management units connected in series and parallel; each battery management unit includes one or two batteries, and 4 or 6 switches, which can realize functions such as positive connection, reverse connection, and bypass of external ports; the switches can be Any one of diodes, triodes, relays, thyristors, thyristors, MOS tubes and IGBTs, or a bidirectional switch module or device composed of them; the flexible battery management system can be managed by multiple batteries Units can be connected in series, in parallel, in series and then in parallel, in parallel and then in series, or in a combination of series and parallel. The system has low requirements on the external charge and discharge voltage, and can even realize the charge and discharge of the external alternating current, and the utility model can also improve the reliability of the battery pack, and can easily and accurately measure its internal resistance.
Description
技术领域 technical field
本发明是一种电池管理系统，实现了电池储能系统中各个电池的均衡、保护和管理，并实现灵活的外部电压接口。 The invention is a battery management system, which realizes the balance, protection and management of each battery in the battery energy storage system, and realizes a flexible external voltage interface.
背景技术 Background technique
随着新能源和技术的发展，电池技术得到了飞速的发展，出现了许多新型的各种电池。但大部分电池的电压和容量都较低，要应用在容量大的场合，例如新能源汽车、新能源分布式储能等场合，就必须对多个电池进行串并联。但由于每个电池的特性并不完全一致，导致电池串并联时必须增加管理或者保护电路，进行有效的监测、均衡和保护。到现在出现了许多种电池管理系统，但都有管控能力弱，电池组间不易并联等问题，另外一般还对电池组的外部端口电压要求高，要求外部电压必须是合适的直流电，不然就会损坏电池组。但又许多应用场合，外部电压是波动的，甚至是交流电，在这种场合，电池组与外部电路之间就需要增加而外的变流器，这样增加了系统成本，并且降低了可靠性。 With the development of new energy and technology, battery technology has developed rapidly, and many new types of batteries have emerged. However, the voltage and capacity of most batteries are relatively low. To be used in large-capacity applications, such as new energy vehicles and new energy distributed energy storage, multiple batteries must be connected in series and parallel. However, since the characteristics of each battery are not exactly the same, it is necessary to add a management or protection circuit for effective monitoring, balancing and protection when the batteries are connected in series and parallel. Many battery management systems have appeared up to now, but all of them have problems such as weak control ability and difficult parallel connection between battery packs. In addition, the external port voltage requirements of battery packs are generally high, and the external voltage must be a suitable direct current, otherwise it will Damage to the battery pack. However, in many applications, the external voltage fluctuates, even alternating current. In this case, an external converter is needed between the battery pack and the external circuit, which increases the system cost and reduces the reliability.
发明内容 Contents of the invention
本发明提出的柔性电池管理系统，克服了现有电池管理系统的不足，提供了一种对外部电压要求低，甚至可以连接交流电的，管控能力强的，并且方便不同电池组串并联的电池管理系统。 The flexible battery management system proposed by the present invention overcomes the shortcomings of the existing battery management system, and provides a battery management system that requires low external voltage, can even be connected to alternating current, has strong control capabilities, and is convenient for connecting different battery packs in series and parallel. system.
本发明的技术方案（对照附图）是： Technical scheme of the present invention (compare accompanying drawing) is:
柔性电池管理系统是由多个电池管理单元串并联组成，每个电池管理单元是由电池B1、开关Q1、开关Q2、开关Q3、开关Q4组成，Q1与Q2串联，Q3与Q4串联，串联的Q1和Q2与串联的Q3和Q4并联在一起然后与电池B1连接，Q1和Q2之间的连接点作为电池管理单元的一个对外端口T2，Q3和Q4之间的连接点作为此电池管理单元另外一个端口T1。 The flexible battery management system is composed of multiple battery management units connected in series and parallel. Each battery management unit is composed of battery B1, switch Q1, switch Q2, switch Q3, and switch Q4. Q1 and Q2 are connected in series, and Q3 and Q4 are connected in series. Q1 and Q2 are connected in parallel with Q3 and Q4 in series and then connected to battery B1. The connection point between Q1 and Q2 is used as an external port T2 of the battery management unit, and the connection point between Q3 and Q4 is used as this battery management unit. One port T1.
进一步地，所述的开关Q1、开关Q2、开关Q3和开关Q4是二极管、三极管、继电器、晶闸管、可 控硅、MOS管和IGBT中的任意一种或多种组合而成。 Further, the switch Q1, the switch Q2, the switch Q3 and the switch Q4 are any one or a combination of diodes, triodes, relays, thyristors, silicon controlled rectifiers, MOS transistors and IGBTs.
进一步地，所述的电池B1为铅酸电池、镍氢电池、钠硫电池、液流电池、超级电容器、 锂电池中的任意一种，还可以是由其多个电池芯组合的电池组。 Further, the battery B1 is any one of a lead-acid battery, a nickel-metal hydride battery, a sodium-sulfur battery, a flow battery, a supercapacitor, and a lithium battery, and it can also be a battery pack composed of a plurality of battery cores thereof.
进一步地，柔性电池管理系统可以由多个所述的电池管理单元串联、并联、或者串并联混合组成。 Further, the flexible battery management system may be composed of multiple battery management units described above in series, in parallel, or in combination.
柔性电池管理系统是由多个电池管理单元串并联组成，每个电池管理单元是由电池B1、电池B2、开关Q1、开关Q2、开关Q3、开关Q4、开关Q5和开关Q6组成，B1与B2串联，Q1与Q2串联，Q3与Q4串联，串联的Q1和Q2、串联的Q3和Q4与串联的B1和B2并联在一起，B1与B2之间的连接点与Q1和Q2之间的连接点通过Q5连接，B1与B2之间的连接点与Q3和Q4之间的连接点通过Q6连接，Q1和Q2之间的连接点作为电池管理单元的一个对外端口T2，Q3和Q4之间的连接点作为此电池管理单元另外一个端口T1。 The flexible battery management system is composed of multiple battery management units connected in series and parallel. Each battery management unit is composed of battery B1, battery B2, switch Q1, switch Q2, switch Q3, switch Q4, switch Q5 and switch Q6. B1 and B2 In series, Q1 and Q2 in series, Q3 and Q4 in series, Q1 and Q2 in series, Q3 and Q4 in series and B1 and B2 in series are connected in parallel, the connection point between B1 and B2 and the connection point between Q1 and Q2 Connected through Q5, the connection point between B1 and B2 and the connection point between Q3 and Q4 are connected through Q6, the connection point between Q1 and Q2 is used as an external port T2 of the battery management unit, and the connection between Q3 and Q4 Point as another port T1 of this battery management unit.
进一步地，所述的开关Q1、开关Q2、开关Q3、开关Q4、开关Q5和开关Q6是二极管、三极管、继电器、晶闸管、可 控硅、MOS管和IGBT中的任意一种或多种组合而成。 Further, the switch Q1, switch Q2, switch Q3, switch Q4, switch Q5 and switch Q6 are any one or more combinations of diodes, triodes, relays, thyristors, silicon controlled rectifiers, MOS tubes and IGBTs. become.
进一步地，所述的电池B1和电池B2为铅酸电池、镍氢电池、钠硫电池、液流电池、超级电容器、 锂电池中的任意一种，还可以是由其多个电池芯组合的电池组。 Further, the battery B1 and the battery B2 are any one of lead-acid batteries, nickel-metal hydride batteries, sodium-sulfur batteries, flow batteries, supercapacitors, and lithium batteries, and can also be composed of multiple battery cells. Battery.
进一步地，柔性电池管理系统可以由多个所述的电池管理单元串联、并联、或者串并联混合组成。 Further, the flexible battery management system may be composed of multiple battery management units described above in series, in parallel, or in combination.
本发明的有益效果是： The beneficial effects of the present invention are:
本发明的柔性电池管系统与现存的电池管理系统相比较，其可以通过对串并联在一起的许多电池管理单元的不同开关的切换实现不同电池管理单元的正接、反接和旁路，从而实现它们之间的均衡、保护等，并且实现系统端口电压灵活，支持宽范围的外部电压，甚至可以直接支持交流电的充放电。当系统充电时，如果某一个电池管理单元有过充电时，可以通过切换开关旁路它进行保护，甚至可以通过反接它对它放电。当系统放电时，如果某一个电池管理单元出现过放电时，可以通过切换开关旁路它进行保护，甚至可以通过反接它对它进行充电。此发明，对外部充放电电压要求低，甚至可以实现外部交流电的充放电，当用于电压范围宽或者交流电时，可以实现不需要外部的变流器，大大节省了系统成本。并且本发明还可以提高电池组的可靠性，如果个别电池出现问题，可以把它旁路过去，不影响系统使用。并且由于可以对每个电池单元的电池进行开路和加载，所以可以很容易和准确的测量其内阻，并计算其SOC。 Compared with the existing battery management system, the flexible battery tube system of the present invention can realize the forward connection, reverse connection and bypass of different battery management units by switching the different switches of many battery management units connected in series and parallel, thereby realizing Balance, protection, etc. between them, and realize the flexible system port voltage, support a wide range of external voltages, and even directly support the charging and discharging of AC power. When the system is charging, if a battery management unit is overcharged, it can be bypassed by a switch for protection, or even discharged by reverse connection. When the system is discharging, if a battery management unit is over-discharged, it can be bypassed by switching the switch for protection, and it can even be charged by reverse connection. This invention has low requirements for external charging and discharging voltage, and can even realize charging and discharging of external alternating current. When it is used for wide voltage range or alternating current, it can realize that no external converter is needed, which greatly saves system cost. Moreover, the present invention can also improve the reliability of the battery pack. If a problem occurs in a single battery, it can be bypassed without affecting the use of the system. And since the battery of each battery cell can be opened and loaded, its internal resistance can be easily and accurately measured, and its SOC can be calculated.
附图说明 Description of drawings
本说明书有四个附图： This manual has four drawings:
图1，四开关的电池管理单元电路； Figure 1, four-switch battery management unit circuit;
图2，六开关的电池管理单元电路 ； Figure 2, six-switch battery management unit circuit;
图3，采用四开关的电池管理单元实现的柔性电池管理系统实施例； Figure 3, an embodiment of a flexible battery management system implemented by a four-switch battery management unit;
图4，三相交流电直连的柔性电池管理系统实施例； Figure 4, an embodiment of a flexible battery management system with three-phase AC direct connection;
具体实施方式 Detailed ways
结合附图对本发明的具体实施进行说明。 The specific implementation of the present invention will be described in conjunction with the accompanying drawings.
图1为四开关的电池管理单元电路原理图，图3是采用这种电路串联实现的柔性电池管理系统实施例，图4是采用三组串联的电池管理单元组串组成的三相交流电的柔性电池管理系统实施例。图2是六开关的电池管理单元电路原理图，它也完全可以替代图3和图4中四开关的电池管理单元，实现同样的功能。 Figure 1 is a schematic diagram of a four-switch battery management unit circuit, Figure 3 is an embodiment of a flexible battery management system implemented in series using this circuit, and Figure 4 is a three-phase AC flexible battery management system composed of three series-connected battery management unit strings. Example of a battery management system. Figure 2 is a circuit schematic diagram of a six-switch battery management unit, which can completely replace the four-switch battery management unit in Figures 3 and 4 to achieve the same function.
图1中的电池管理单元电路，由四个开关Q1、Q2、Q3、Q4和一个电池B1组成。四个开关它们连接成H桥的样子，其中间的节点为端口T1和T2，H桥的上端与电池B1的正极相连，下端与电池B1的负极相连。多个这个的电池管理单元串并联可以实现高电压和大容量的电池组。当Q3、Q2导通，Q1、Q4断开时，端口T1对端口T2是正电压，称为正接；当Q1、Q4导通，Q2、Q3断开时，端口T1对端口T2是正电压，称为反接；当Q1、Q3导通，Q2、Q4断开时，或者 当Q2、Q4导通，Q1、Q3断开时，这时候T1与T2直接短接，称为旁路，因为这时电流没有连入系统中。 The battery management unit circuit in Figure 1 consists of four switches Q1, Q2, Q3, Q4 and a battery B1. The four switches are connected in the form of an H-bridge, the nodes in the middle of which are ports T1 and T2, the upper end of the H-bridge is connected to the positive pole of the battery B1, and the lower end is connected to the negative pole of the battery B1. A plurality of such battery management units can be connected in series and parallel to realize a high-voltage and large-capacity battery pack. When Q3 and Q2 are turned on and Q1 and Q4 are turned off, port T1 has a positive voltage to port T2, which is called positive connection; when Q1 and Q4 are turned on, and Q2 and Q3 are turned off, port T1 has a positive voltage to port T2, which is called positive connection. Reverse connection; when Q1 and Q3 are turned on and Q2 and Q4 are turned off, or when Q2 and Q4 are turned on and Q1 and Q3 are turned off, T1 and T2 are directly shorted at this time, which is called bypass, because at this time the current Not connected to the system.
图2中的电池管理单元电路，由六个开关Q1、Q2、Q3、Q4和两个电池B1、B2组成。电池B1和B2串联；开关Q1、Q2、Q3、Q4连接成H桥的样子，其中间的节点为端口T1和T2，上节点与电池B1的正极相连，下节点与电池B1的负极相连；开关Q5连接两个电池的中点与开关Q1和Q2的中点；开关Q6连接两个电池的中点与开关Q3和Q4的中点。当Q3、Q2导通，Q1、Q4、Q5、Q6断开时，端口T1对端口T2是B1和B2串联正电压，称为同时正接；当Q1、Q4导通，Q2、Q3、Q5、Q6断开时，端口T1对端口T2是B1和B2串联反电压，称为同时反接；当Q3、Q2导通，Q1、Q4、Q5、Q6断开时，端口T1对端口T2是B1和B2串联正电压，称为同时正接；当Q3、Q5导通，其他都关断时，端口T1对端口T2是B1的正电压，称为B1正接；当Q1、Q6导通，其他都关断时，端口T1对端口T2是B1的反电压，称为B1反接；当Q2、Q6导通，其他都关断时，端口T1对端口T2是B2的正电压，称为B2正接；当Q4、Q5导通，其他都关断时，端口T1对端口T2是B2的反电压，称为B2反接；当Q1和Q3同时导通，其他的都关断时，或者Q2和Q4同时导通，其他都关断时，或者Q5和Q6同时导通，其他都关断时，这时端口T1对端口T2是短接，这时称为旁路，因为这是B1和B2都没有接入系统中。 The battery management unit circuit in Figure 2 consists of six switches Q1, Q2, Q3, Q4 and two batteries B1, B2. Batteries B1 and B2 are connected in series; switches Q1, Q2, Q3, and Q4 are connected to form an H-bridge, and the nodes in the middle are ports T1 and T2. The upper node is connected to the positive pole of battery B1, and the lower node is connected to the negative pole of battery B1; the switch Q5 connects the midpoint of the two batteries to the midpoint of switches Q1 and Q2; switch Q6 connects the midpoint of the two batteries to the midpoint of switches Q3 and Q4. When Q3 and Q2 are turned on, and Q1, Q4, Q5, and Q6 are turned off, port T1 is connected to port T2 with B1 and B2 positive voltage in series, which is called simultaneous positive connection; when Q1 and Q4 are turned on, Q2, Q3, Q5, and Q6 When disconnected, port T1 is B1 and B2 series reverse voltage to port T2, which is called simultaneous reverse connection; when Q3 and Q2 are turned on and Q1, Q4, Q5 and Q6 are disconnected, port T1 is B1 and B2 to port T2 Positive voltage in series is called positive connection at the same time; when Q3 and Q5 are turned on and others are turned off, port T1 is positive voltage of B1 to port T2, which is called B1 positive connection; when Q1 and Q6 are turned on and others are turned off , port T1 is the reverse voltage of B1 to port T2, which is called B1 reverse connection; when Q2 and Q6 are turned on and the others are turned off, port T1 is positive voltage of B2 to port T2, which is called B2 positive connection; When Q5 is turned on and others are turned off, port T1 is the reverse voltage of B2 to port T2, which is called B2 reverse connection; when Q1 and Q3 are turned on at the same time, and others are turned off, or Q2 and Q4 are turned on at the same time, When the others are all turned off, or Q5 and Q6 are turned on at the same time, and the others are turned off, then the port T1 is short-circuited to the port T2, which is called a bypass at this time, because neither B1 nor B2 is connected to the system .
采用上述图1和图2的电池管理单元串联、并联、串联再并联、并联再串联、或者根据需要各种串并联组合，就可以实现大容量、高电压的电池管理系统。图3和图4就是四开关的电池管理单元串并联的两个实施例。 A battery management system with large capacity and high voltage can be realized by using the above-mentioned battery management units in Figure 1 and Figure 2 in series, in parallel, in series and then in parallel, in parallel and then in series, or in various series and parallel combinations as required. Fig. 3 and Fig. 4 are two embodiments of series-parallel connection of four-switch battery management units.
图3是由多个四开关的电池管理单元串联组成，可以实现大容量的电池组管理系统，并且实现外部单相交流电的直连，或者称为交流储能器。其中的开关由Mosfet和二极管并联组成，当然大部分的大功率Mosfet都有寄生二极管，也可以起到相同的作用。其中每个电池管理单元管理一个电池，例如是磷酸铁锂电池，则每个电池管理单元可以输入或输出正3.2V左右、负3.2V左右、0V左右。例如由一百个这样的单元串联在一起，外部端口就可以实现从-320V～+320V电压的充放电，配合对每个电池管理电源的高速开关切换，就可以实现交流电的直连。当然实际应用中还要串联电抗器，并联电容等对电流电压进行滤波和EMC防护等。电池的均衡管理是通过对相应的电池管理单元进行正接、反接或旁路实现的。例如当充电时，如果某电池已经接近饱和了，那么就可以通过旁路它，对它进行保护；当放电时，如果某电池已经接近过放了，那么也可以通过旁路它，对它进行保护。同时，通过上述这样的方法，实现电池的均衡。电池的内阻是通过比较其开路电压（相应的电池管理单元处于旁路状态时，此时电池的电压）和有电流通过时的电压（相应的电池管理单元处于正接或者反接时，此时电池的电压）电压差与电流相除得到。 Figure 3 is composed of multiple four-switch battery management units in series, which can realize a large-capacity battery pack management system and realize direct connection of external single-phase AC power, or called AC energy storage. The switch is composed of a Mosfet and a diode connected in parallel. Of course, most high-power Mosfet have parasitic diodes, which can also play the same role. Each battery management unit manages a battery, such as a lithium iron phosphate battery, and each battery management unit can input or output about positive 3.2V, negative 3.2V, or 0V. For example, if one hundred such units are connected in series, the external port can realize charging and discharging from -320V to +320V voltage, and cooperate with the high-speed switching of each battery management power supply to realize the direct connection of AC power. Of course, in practical applications, series reactors and parallel capacitors are required to filter the current and voltage and provide EMC protection. The balanced management of the battery is realized by connecting the corresponding battery management unit in a positive connection, reverse connection or bypass. For example, when charging, if a battery is close to saturation, it can be protected by bypassing it; when discharging, if a battery is close to over-discharge, it can also be protected by bypassing it. Protect. At the same time, battery balancing is achieved through the above-mentioned method. The internal resistance of the battery is calculated by comparing its open circuit voltage (when the corresponding battery management unit is in the bypass state, the voltage of the battery at this time) and the voltage when there is current passing through it (when the corresponding battery management unit is in positive or reverse connection, at this time The voltage of the battery) is obtained by dividing the voltage difference by the current.
图4是有三组的电池管理单元串联组串形成的三相交流电直连的电池管理系统。其是有三个组串形成，它们一端直接连着一起形成中点N，另外的一端形成三相电的三相A、B、C。实际应用中也常在每个相上串联电抗器进行平波。每个组串的工作机理类似图3中的实施例，三个组串都是交流充放电，只是他们的相位差120度，这样形成三相电。每个电池的保护、内阻测量电池管理功能与图3的实施例相同。 Figure 4 is a three-phase AC direct-connected battery management system formed by three groups of battery management units connected in series. It is formed by three strings, one end of which is directly connected together to form the midpoint N, and the other end forms three phases A, B, and C of three-phase electricity. In practical applications, a reactor is often connected in series with each phase for smoothing. The working mechanism of each string is similar to the embodiment in Figure 3. The three strings are AC charging and discharging, but their phase difference is 120 degrees, thus forming three-phase electricity. The protection and internal resistance measurement battery management functions of each battery are the same as those in the embodiment of FIG. 3 .
以上所述仅为本发明的较佳实施方式，并不是用于限制本发明，在不背离本发明 的原理和实质的前提下，本领域的技术人员可以对这些实施方式做出多种变更或修改。因 此，本发明的保护范围由所附权利要求书限定。 The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention. Revise. Accordingly, the protection scope of the present invention is defined by the appended claims.
Claims (8)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140978A (en) * | 2014-05-29 | 2015-12-09 | 丰郅(上海)新能源科技有限公司 | Flexible cell management system |
| CN111591140A (en) * | 2020-05-15 | 2020-08-28 | 华为技术有限公司 | Battery management system and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105140978A (en) * | 2014-05-29 | 2015-12-09 | 丰郅(上海)新能源科技有限公司 | Flexible cell management system |
| CN105140978B (en) * | 2014-05-29 | 2019-12-03 | 丰郅(上海)新能源科技有限公司 | Flexible battery management system |
| CN111591140A (en) * | 2020-05-15 | 2020-08-28 | 华为技术有限公司 | Battery management system and vehicle |
| WO2021227589A1 (en) * | 2020-05-15 | 2021-11-18 | 华为数字能源技术有限公司 | Battery management system and vehicle |
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