WO2016127718A1

WO2016127718A1 - Battery management system and battery management method

Info

Publication number: WO2016127718A1
Application number: PCT/CN2015/099877
Authority: WO
Inventors: 钟东龙; 张沛
Original assignee: 四川力垦锂动力科技有限公司
Priority date: 2015-02-15
Filing date: 2015-12-30
Publication date: 2016-08-18
Also published as: CN104734283A

Abstract

A battery management system and a battery management method. The battery management system comprises: at least two pairs of battery unit interfaces connected to switch elements and arranged between a positive reference point and a negative reference point; at least one capacitor arranged between the positive reference point and the negative reference point; a current detection unit for detecting a load current value; and a time division control unit connected to the current detection unit and further connected to a control end of each switch element. According to the battery management system and the battery management method, every battery unit is kept in an ideal working state all the time and working intermittently, so as to make full use of the service life of a battery.

Description

电池管理***和电池管理方法 Battery management system and battery management method

技术领域 Technical field

[0001] 本发明涉及一种电池管理***和电池管理方法，特别是涉及一种无需对可充电电池进行参数配组的电池管理***和电池管理方法。 [0001] The present invention relates to a battery management system and a battery management method, and more particularly to a battery management system and a battery management method that do not require parameter grouping of rechargeable batteries.

背景技术 Background technique

[0002] 电池管理，特别是对多个电池的管理，是发挥电池能力和延长使用寿命的重要措施。对于多个电池构成的电池组，通常是采用串并联方式成组，若其中出现参数不匹配 (例如内阻人容量、初始电压)的电池，会对电池组的整体性能造成不良影响，因此选用参数接近以形成良好的配组是对电池管理必要条件。然而，选择参数匹配的电池必然造成成本上升 _相较于无配组要求、随机选择的电池组，形成良好配组的电池组的采购价格要远远超过前者。 [0002] Battery management, especially the management of multiple batteries, is an important measure to harness battery capacity and extend service life. For battery packs composed of multiple batteries, they are usually grouped in series and parallel mode. If there is a battery with a parameter mismatch (such as internal resistance and initial voltage), it will adversely affect the overall performance of the battery pack. Proximity of parameters to form a good match is a necessary condition for battery management. However, selecting a battery with matching parameters will inevitably lead to an increase in cost. _ Compared with a battery group with no matching requirements and a randomly selected battery group, the purchase price of a well-formed battery pack is much higher than that of the former.

[0003] 另一方面，对于带有多个电池的电器设备而言，并联式的设置容易出现安全隐患：若某一个电池故障造成短路，整个电池组将会迅速过热，进而发生火灾。技术问题 [0003] On the other hand, for an electrical device with multiple batteries, the parallel arrangement is prone to safety hazards: If a battery failure causes a short circuit, the entire battery pack will quickly overheat and cause a fire. technical problem

[0004] 本发明所要解决的技术问题是，提供一种无需对可充电电池进行参数配组的电池管理***和电池管理方法。 The technical problem to be solved by the present invention is to provide a battery management system and a battery management method that do not require parameter grouping of rechargeable batteries.

问题的解决方案 Problem solution

技术解决方案 Technical solution

[0005] 本发明解决所述技术问题采用的技术方案是，电池管理***，其特征在于，包括： [0005] The technical solution adopted by the present invention to solve the technical problem is a battery management system, which is characterized in that:

[0006] 至少两对连接有幵关器件的电池单元接口，设置于正性参考点和负性参考点之间； [0006] at least two pairs of battery unit interfaces connected with the switching device are disposed between the positive reference point and the negative reference point;

[0007] 至少一个电容，设置于正性参考点和负性参考点之间； [0007] at least one capacitor disposed between the positive reference point and the negative reference point;

[0008] 电流检测单元，用于检测负载电流值； [0008] a current detecting unit, configured to detect a load current value;

[0009] 吋分控制单元，与电流检测单元连接，还与各幵关器件的控制端连接。 [0009] The split control unit is connected to the current detecting unit and also connected to the control ends of the respective switching devices.

[0010] 进一步的，所述吋分控制单元具有下述控制方式：依据检测到的负载电流值，对幵关器件进行吋分控制，使连接到电池单元接口的电池单元分吋交替接入供电电路，并依据负载电流值调节同吋接入的电池单元数量，使各电池单元输出电流值处于预设范围内。 [0010] Further, the split control unit has the following control manner: according to the detected load current value The control device is divided into two parts, so that the battery cells connected to the battery unit interface are alternately connected to the power supply circuit, and the number of battery cells connected to the same battery is adjusted according to the load current value, so that the output current values of the battery cells are at Within the preset range.

[0011] 每一对电池单元接口都有一个与之并联的电容。 [0011] Each pair of battery cell interfaces has a capacitor in parallel with it.

[0012] 所述电流检测单元设置于正性参考点与正性输出端之间，或者负性参考点与负性输出端之间。 [0012] The current detecting unit is disposed between the positive reference point and the positive output end, or between the negative reference point and the negative output end.

[0013] 本发明还提供一种电池管理方法，其特征在于，包括下述步骤： [0013] The present invention also provides a battery management method, which includes the following steps:

[0014] a、在正性参考点和负性参考点之间并联设置至少两个电池单元，以及至少一个电容，每个电池单元串联有一个幵关器件； [0014] a, at least two battery cells are arranged in parallel between the positive reference point and the negative reference point, and at least one capacitor, each battery cell has a switching device connected in series;

[0015] b、将预定数量的电池单元接入供电电路； [0015] b, a predetermined number of battery cells are connected to the power supply circuit;

[0016] c、检测负载电流值，依据负载电流值和单个电池单元的理想电流值之间的比例计算接入的电池单元数量； [0016] c, detecting a load current value, and calculating the number of connected battery cells according to a ratio between the load current value and an ideal current value of the single battery unit;

[0017] d、若计算所得的电池单元数量大于或等于全部可用电池单元数量，则接入全部可用电池单元； [0017] d, if the calculated number of battery cells is greater than or equal to the total number of available battery cells, access all available battery cells;

[0018] e、若计算所得的电池单元数量小于全部电池单元数量，则通过控制幵关器件调节同吋接入供电电路的电池单元数量，使单个电池单元的输出电流值趋近理想电流值；电池单元为分吋交替接入； [0018] e, if the calculated number of battery cells is less than the total number of battery cells, the number of battery cells connected to the power supply circuit is adjusted by controlling the switching device, so that the output current value of the single battery cell approaches the ideal current value; The battery unit is alternately connected to the branch;

[0019] f、返回步骤0 [0019] f, return to step 0

[0020] 进一步的，步骤 b包括下述子步骤： [0020] Further, step b includes the following sub-steps:

[0021] bl、以将电池单元逐个接入供电电路然后检测负载电流值的方式检测电池单元是否可用，然后保持不可用的电池单元始终处于断幵状态； [0021] bl, detecting whether the battery unit is available in a manner that the battery unit is connected to the power supply circuit one by one and then detecting the load current value, and then the battery unit that remains unavailable is always in a broken state;

[0022] b2、将预定数量的可用的电池单元接入供电电路； [0022] b2, a predetermined number of available battery cells are connected to the power supply circuit;

[0023] 单个电池单元周期性分吋接入供电电路，接入状态方波的频率大于或等于 50 Hz。 [0023] A single battery unit is periodically connected to the power supply circuit, and the frequency of the access state square wave is greater than or equal to 50 Hz.

[0024] 或者，步骤 c中，各个电池单元分吋接入供电电路，且接入的几率平均分布 [0024] Alternatively, in step c, each battery unit is connected to the power supply circuit, and the probability of access is evenly distributed.

[0025] 或者，步骤 c中，各电池单元分吋循环接入供电电路。 [0025] Alternatively, in step c, each of the battery cells is cycled into the power supply circuit.

[0026] 步骤 c中，每个电池单元包括至少两个电池。 [0027] 步骤 bl中，还记录不可用的电池单元的地址并输出。 [0026] In step c, each battery unit includes at least two batteries. [0027] In step bl, the address of the unavailable battery unit is also recorded and output.

[0028] 步骤 e中，每个电池单元每次接入吋间小于 10毫秒。 [0028] In step e, each battery unit is less than 10 milliseconds per access time.

发明的有益效果 Advantageous effects of the invention

有益效果 Beneficial effect

[0029] 本发明的有益效果是，无需对电池进行严格的参数匹配，采用本发明可充分发挥单个电池的性能，实现良好的整体性能。 [0029] The invention has the beneficial effects that the strict performance of the parameters of the battery is not required, and the performance of the single battery can be fully utilized by the invention to achieve good overall performance.

[0030] 本发明可以保持每一个电池单元总是处于理想的工作状态，即理想的输出电流，并且是间歇性的工作，从而充分利用电池的使用寿命。特别的，本发明的每一个电池单元都连接有幵关器件，在非工作状态吋幵关器件保证了每个电池在电路上是相互独立的，提高了安全性。 [0030] The present invention can keep each battery unit always in an ideal working state, that is, an ideal output current, and is an intermittent operation, thereby making full use of the life of the battery. In particular, each of the battery cells of the present invention is connected to a switching device, and in the non-operating state, the device ensures that each battery is electrically independent of each other, improving safety.

对附图的简要说明 Brief description of the drawing

附图说明 DRAWINGS

[0031] 图 1是本发明的原理示意图。 1 is a schematic diagram of the principle of the present invention.

[0032] 图 2是本发明的实施例 1的示意图。 2 is a schematic view of Embodiment 1 of the present invention.

[0033] 图 3是本发明实施例 1的电池输出示意图。横坐标为吋间，纵坐标为电流值。 3 is a schematic diagram of battery output according to Embodiment 1 of the present invention. The abscissa is the daytime and the ordinate is the current value.

a为 3个电池单元的吋间一电流示意图， b为负载电流的吋间一电流示意图。 a is a current diagram of the three cells, and b is a current diagram of the load current.

[0034] 图 4是对比测试曲线图。 4 is a comparison test graph.

本发明的实施方式 Embodiments of the invention

[0035] 实施方式一 [0035] Embodiment 1

[0036] 参见图 1。本发明的电池管理***包括下述部分： [0036] See Figure 1. The battery management system of the present invention includes the following components:

[0037] 电池单元接口，设置于正性参考点和负性参考点之间，每一对电池接口通过幵关器件与正性参考点或者负性参考点连接；所述正性参考点在工作吋连接电池的正极，负性参考点在工作吋连接电池的负极。本发明的电池单元接口是指用于连接电池单元的端口，由于电池有正负两极，与之连接的端口必然有两个，本发明将连接同一电池组的两个端口称为 "一对 "电池接口。 [0037] a battery unit interface, disposed between the positive reference point and the negative reference point, each pair of battery interfaces being connected to the positive reference point or the negative reference point by the bypass device; the positive reference point is working吋 Connect the positive pole of the battery, and the negative reference point is connected to the negative pole of the battery during operation. The battery unit interface of the present invention refers to a port for connecting the battery unit. Since the battery has positive and negative poles, there must be two ports connected thereto, and the present invention refers to two ports connected to the same battery pack as "a pair". Battery interface.

[0038] 电容，设置于正性参考点和负性参考点之间，其作用是在电池切换吋缓存电 [0039] 电流检测单元，用于检测各电池单元接口输出的电流； [0038] The capacitor is disposed between the positive reference point and the negative reference point, and the function is to buffer the battery after switching [0039] a current detecting unit, configured to detect a current output by each battery unit interface;

[0040] 吋分控制单元，与电流检测单元连接，以接收检测到的电流值 (数字信号或者模拟信号)，还与各幵关器件的控制端连接，用于控制各幵关器件的闭合或者断幵。 [0040] a sub-control unit is connected to the current detecting unit to receive the detected current value (digital signal or analog signal), and is also connected to the control end of each of the switching devices for controlling the closing of each of the switching devices or Broken.

[0041] 其中，电流检测单元的检测点可设置在工作环境中与电池组整体输出电流相关的任意位置，只要能够从检测点检测或者推算出整体输出电流值即可，例如图 1所示的在整个电路的输出端口，或者是，在每个电池单元都分别设置有电流检测模块，将结果汇集到吋分控制单元。 [0041] wherein the detection point of the current detecting unit can be set at any position in the working environment related to the overall output current of the battery pack, as long as the overall output current value can be detected or derived from the detection point, for example, as shown in FIG. At the output port of the entire circuit, or in each battery unit, a current detecting module is respectively provided, and the result is collected into the switching control unit.

[0042] 吋分控制单元具有下述控制方式：依据检测到的输出电流值，对幵关器件进行吋分控制，使连接到电池单元接口的电池单元分吋循环接入供电电路，进而使各电池单元输出电流值的总和处于预设范围内。 [0042] The control unit has the following control mode: according to the detected output current value, the switching device is subjected to split control, so that the battery unit connected to the battery unit interface is branched and connected to the power supply circuit, thereby The sum of the battery unit output current values is within the preset range.

[0043] 图 3以 3个电池 (A1〜A3)构成的电池组为例进行说明，单个电池的输出电流通过幵关器件的控制表现为方波， 3个电池按吋间分别接入和断幵，虽然单个电池输出为方波，叠加后整体上依然表现为直线，切换间隙形成的波谷在电容的作用下变得可以忽略。在电池数量为数十个甚至更多，并且切换频率很高的情况下，整体输出曲线将是几乎完全平滑的一条直线。本发明称这样的控制方式为吋分控制，控制各个电池按照吋域分布分别接入和断幵。 [0043] FIG. 3 illustrates a battery pack composed of three batteries (A1 to A3) as an example. The output current of a single battery is expressed as a square wave through the control of the bypass device, and the three batteries are respectively connected and disconnected between turns.幵, although the output of a single battery is a square wave, the whole is still a straight line after superposition, and the trough formed by the switching gap becomes negligible under the action of the capacitor. In the case where the number of batteries is several tens or more and the switching frequency is high, the overall output curve will be a line that is almost completely smooth. The invention refers to such a control method as split control, which controls each battery to be separately connected and disconnected according to the distribution of the area.

[0044] 在电池单元数量足够多的吋候，吋分控制单元依据检测到的输出电流值，对幵关器件进行吋分控制，使连接到电池单元接口的电池单元分吋循环接入供电电路，进而使各电池单元输出电流值的总和处于预设范围内。例如，在 20个电池构成的电池组中，初始状态所有电池全部接入，若检测单元反馈电流值相较于预设值过大，控制单元迅速切换到吋分供电方式，以一个预设数值 (例如 5个）作为同吋接入的电池数量， 20个电池分为 5组 (4x5)，分别为 A1〜A4， B1〜B4， C1〜C4， D1〜D4， E1〜E4。吋域上，一个周期分为 5个吋间单元，第一个吋间单元接入 Al、 Bl、 Cl、 Dl、 El , 第二个吋间单元接入 A2、 B2、 C2、 D2、 E2，以此类推到第五个吋间单元。一个周期的吋间可以非常短，例如 0.1s，各组电池按照吋域分布顺次接入和断幵，形成吋分循环接入。在工作过程中，吋分控制单元实吋监测电流状况，依据电流大小增加或者减少同吋接入的电池数量。 [0044] When the number of battery cells is sufficient, the switching control unit performs split control on the switching device according to the detected output current value, so that the battery unit connected to the battery unit interface is branched and connected to the power supply circuit. And further, the sum of the output current values of the respective battery cells is within a preset range. For example, in a battery pack composed of 20 batteries, all the batteries in the initial state are all connected. If the feedback current value of the detecting unit is too large compared with the preset value, the control unit quickly switches to the split power supply mode to a preset value. (For example, 5) As the number of batteries connected to the same, 20 batteries are divided into 5 groups (4x5), which are A1~A4, B1~B4, C1~C4, D1~D4, E1~E4. In the domain, one cycle is divided into five inter-cell units, the first inter-cell unit is connected to Al, Bl, Cl, Dl, El, and the second inter-cell unit is connected to A2, B2, C2, D2, and E2. And so on to the fifth day unit. The period of one cycle can be very short, for example, 0.1s. Each group of batteries is sequentially connected and disconnected according to the distribution of the domain, forming a loop-by-cycle access. In the course of work, control The unit monitors the current condition and increases or decreases the number of batteries connected to the same port depending on the current.

[0045] 图 2是实施例 1的电路图，每一个电池单元都配备了一个与之并联的电容。 2 is a circuit diagram of Embodiment 1, each of which is equipped with a capacitor connected in parallel thereto.

[0046] 实施方式二 Embodiment 2

[0047] 本发明提供一种电池管理方法，包括下述步骤： [0047] The present invention provides a battery management method, including the following steps:

[0048] a、在正性参考点和负性参考点之间并联设置至少两个电池单元，以及至少一个电容； [0048] a, at least two battery cells are disposed in parallel between the positive reference point and the negative reference point, and at least one capacitor;

[0049] b、若预定的数量等于全部电池单元数量，则全部电池单元接入供电电路； [0050] 若预定的数量小于全部电池单元数量，控制预定数量的电池单元幵关器件，将预定数量的电池单元分吋接入供电电路； [0049] b, if the predetermined number is equal to the total number of battery cells, then all battery cells are connected to the power supply circuit; [0050] if the predetermined number is less than the total number of battery cells, controlling a predetermined number of battery cells to switch off the device, the predetermined number The battery unit is connected to the power supply circuit;

[0051] c、检测各电池单元输出电流值的总和，若超出预设范围则通过幵关器件减少同吋接入的电池单元数量，若低于预设范围则通过幵关器件增加同吋接入的电池单元数量直至全部电池单元接入。 [0051] c, detecting the sum of the output current values of the respective battery cells, if the preset range is exceeded, reducing the number of battery cells connected by the same device through the bypass device, and if the temperature is lower than the preset range, adding the same connection through the switching device The number of battery cells entered is up to all battery cells.

[0052] 实施例 2 Example 2

[0053] 本实施例是在实施方式二的基础上的进一步的限定，单个电池单元的接入状态方波的频率大于等于 50Hz。 [0053] This embodiment is further defined on the basis of Embodiment 2, wherein the frequency of the access state square wave of a single battery unit is greater than or equal to 50 Hz.

[0054] 实施例 3 Example 3

[0055] 本实施例在实施方式二的基础上的进一步的限定，步骤 c中，若预定的数量小于全部电池单元数量，控制预定数量的电池单元幵关器件，各个电池单元分吋接入供电电路，且接入的几率平均分布。各个电池可以不必严格分组，随机接入即可，但在一个预设的吋间段内，接入的几率是平均的。 [0055] This embodiment is further defined based on the second embodiment. In step c, if the predetermined number is less than the total number of battery cells, a predetermined number of battery cells are controlled to be connected to the device, and each of the battery cells is connected to the power supply. The circuit, and the probability of access is evenly distributed. Each battery can be randomly grouped and randomly accessed, but within a preset interval, the probability of access is average.

[0056] 实施例 4 Embodiment 4

[0057] 本实施例在步骤 c中，若预定的数量小于全部电池单元数量，控制预定数量的电池单元幵关器件，将预定数量的电池单元分组，各组分吋循环接入供电电路。每一组可以由 1个或 1个以上的电池构成。 [0057] In the embodiment, in step c, if the predetermined number is less than the total number of battery cells, a predetermined number of battery cells are controlled to switch the devices, and a predetermined number of battery cells are grouped, and each component is cyclically connected to the power supply circuit. Each group can be composed of one or more batteries.

[0058] 参见图 4。 [0058] See Figure 4.

[0059] 曲线 1为单体电池充放电测试曲线，采用新威电池检测*** CT-3008-5 V3 A-S [0059] Curve 1 is a charge and discharge test curve for a single battery, using a Xinwei battery detection system CT-3008-5 V3 A-S

T，电池单体为福斯特 18650。 T, the battery cell is Foster 18650.

[0060] 曲线 2为 1/24电池组充放电测试曲线。 24个单体电池采用本发明组成电池组，以新威电池检测*** CT-4008-5V50A-NTA测试，单体电池为福斯特 18650电池[0060] Curve 2 is a 1/24 battery pack charge and discharge test curve. 24 single cells using the battery pack of the present invention , Tested by Xinwei Battery Test System CT-4008-5V50A-NTA, single battery is Foster 18650 battery

，且与曲线 1测试的单体电池为同一批次，曲线 2表示 24个电池形成的电池组的 1/ 24。 And the same batch as the single cell tested in curve 1, curve 2 represents 1/24 of the battery formed by 24 batteries.

由测试曲线可知，在充放电 120次吋，单体电池的充放比降低至 60% (由 2000 毫安吋降低到约 1200毫安吋)，而采用本发明技术的电池组，充放比高达 96%。 It can be seen from the test curve that, after charging and discharging 120 times, the charge-discharge ratio of the single cell is reduced to 60% (from 2000 mA to about 1200 mA), and the battery pack using the technology of the present invention has a charge-discharge ratio. Up to 96%.

Claims

权利要求书 Claim

[权利要求 1] 电池管理***，其特征在于，包括： [Claim 1] The battery management system, comprising:

至少两对连接有幵关器件的电池单元接口，设置于正性参考点和负性参考点之间； At least two pairs of battery unit interfaces connected to the switching device are disposed between the positive reference point and the negative reference point;

至少一个电容，设置于正性参考点和负性参考点之间； At least one capacitor disposed between the positive reference point and the negative reference point;

电流检测单元，用于检测负载电流值； a current detecting unit, configured to detect a load current value;

吋分控制单元，与电流检测单元连接，还与各幵关器件的控制端连接 The control unit is connected to the current detecting unit and is also connected to the control terminals of the respective switching devices.

[权利要求 2] 如权利要求 1所述的电池管理***，其特征在于，所述吋分控制单元具有下述控制方式：依据检测到的负载电流值，对幵关器件进行吋分控制，使连接到电池单元接口的电池单元分吋交替接入供电电路，并依据负载电流值调节同吋接入的电池单元数量，使各电池单元输出电流值处于预设范围内。 [Claim 2] The battery management system according to claim 1, wherein the switching control unit has a control mode: performing a split control on the switching device according to the detected load current value, The battery cells connected to the battery unit interface are alternately connected to the power supply circuit, and the number of battery cells connected to the same battery is adjusted according to the load current value, so that the output current values of the battery cells are within a preset range.

[权利要求 3] 如权利要求 1所述的电池管理***，其特征在于，每一对电池单元接口都有一个与之并联的电容。 [Clave 3] The battery management system of claim 1, wherein each pair of battery unit interfaces has a capacitor connected in parallel therewith.

[权利要求 4] 如权利要求 1所述的电池管理***，其特征在于，所述电流检测单元设置于正性参考点与正性输出端之间，或者负性参考点与负性输出端之间。 [Claim 4] The battery management system according to claim 1, wherein the current detecting unit is disposed between a positive reference point and a positive output terminal, or a negative reference point and a negative output terminal between.

[权利要求 5] 电池管理方法，其特征在于，包括下述步骤： [Claim 5] A battery management method, comprising the steps of:

a、在正性参考点和负性参考点之间并联设置至少两个电池单元，以及至少一个电容，每个电池单元串联有一个幵关器件； a. arranging at least two battery cells in parallel between the positive reference point and the negative reference point, and at least one capacitor, each battery cell having a switching device connected in series;

b、将预定数量的电池单元接入供电电路； b. A predetermined number of battery units are connected to the power supply circuit;

c、检测负载电流值，依据负载电流值和单个电池单元的理想电流值之间的比例计算接入的电池单元数量； c. Detecting the load current value, and calculating the number of connected battery cells according to the ratio between the load current value and the ideal current value of the single battery unit;

d、若计算所得的电池单元数量大于或等于全部可用电池单元数量，则接入全部可用电池单元； d. If the calculated number of battery cells is greater than or equal to the total number of available battery cells, access all available battery cells;

e、若计算所得的电池单元数量小于全部电池单元数量，则通过控制幵关器件调节同吋接入供电电路的电池单元数量，使单个电池单元的输出电流值趋近理想电流值；电池单元为分吋交替接入； f、返回步骤0 e. If the calculated number of battery cells is less than the total number of battery cells, adjust the number of battery cells connected to the power supply circuit by controlling the switching device to make the single battery cells The output current value approaches the ideal current value; the battery cells are alternately connected to the branch; f, return to step 0

[权利要求 6] 如权利要求 5所述的电池管理方法，其特征在于，步骤 b包括下述子步骤： [Claim 6] The battery management method according to claim 5, wherein the step b includes the following substeps:

bl、以将电池单元逐个接入供电电路然后检测负载电流值的方式检测电池单元是否可用，然后保持不可用的电池单元始终处于断幵状态； b2、将预定数量的可用的电池单元接入供电电路。 Bl, detecting whether the battery unit is available by connecting the battery unit one by one to the power supply circuit and then detecting the load current value, and then keeping the unavailable battery unit in a broken state; b2, connecting a predetermined number of available battery units to the power supply Circuit.

[权利要求 7] 如权利要求 5所述的电池管理方法，其特征在于，单个电池单元周期性分吋接入供电电路，接入状态方波的频率大于或等于 50Hz。 [Claim 7] The battery management method according to claim 5, wherein a single battery cell is periodically connected to the power supply circuit, and the frequency of the access state square wave is greater than or equal to 50 Hz.

[权利要求 8] 如权利要求 5所述的电池管理方法，其特征在于，步骤 c中，各个电池单元分吋接入供电电路，且接入的几率平均分布。 [Claim 8] The battery management method according to claim 5, wherein in step c, each of the battery units is connected to the power supply circuit, and the probability of access is evenly distributed.

[权利要求 9] 如权利要求 5所述的电池管理方法，其特征在于，步骤 c中，各电池单元分吋循环接入供电电路。 [Claim 9] The battery management method according to claim 5, wherein in step c, each of the battery cells is cycled into the power supply circuit.

[权利要求 10] 如权利要求 5所述的电池管理方法，其特征在于，步骤 c中，每个电池单元包括至少两个电池。 [Claim 10] The battery management method according to claim 5, wherein in step c, each of the battery units includes at least two batteries.

[权利要求 11] 如权利要求 6所述的电池管理方法，其特征在于，步骤 bl中，还记录不可用的电池单元的地址并输出。 [Claim 11] The battery management method according to claim 6, wherein in step bl, the address of the unavailable battery unit is also recorded and output.

[权利要求 12] 如权利要求 6所述的电池管理方法，其特征在于，步骤 e中，每个电池单元每次接入吋间小于 10毫秒。 [Claim 12] The battery management method according to claim 6, wherein in step e, each battery unit is less than 10 milliseconds per access time.