Cluster-level management system for multiple batteries

Abstract

The invention relates to a multi-battery cluster-level management system, the system comprises a cluster-level management circuit, the cluster-level management circuit is respectively in communication connection with a first conversion circuit, a second conversion circuit and a third conversion circuit, the cluster-level management circuit has a power supply mode, and when the cluster-level management circuit is in the power supply mode, the cluster-level management circuit is connected with the first conversion circuit. Battery characteristic information of the first battery pack and the second battery pack is obtained, and when the battery characteristic information reflects that the first battery pack or the second battery pack meets the set power supply condition, the first conversion circuit and the third conversion circuit are controlled to work, or the second conversion circuit and the third conversion circuit are controlled to work.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of battery management, and more specifically, to a cluster-level management system for multiple batteries. Background Art

[0002] With the widespread application of series-connected batteries, the series-connected batteries can provide power to load devices, so that the load devices can work after being powered. At present, the existing series-connected batteries can be combined with a DC-AC conversion circuit and an isolation transformer to convert the DC power output by the series-connected batteries into DC power that meets the requirements. However, the number of batteries connected in series may be limited, which makes it difficult for a single set of series-connected batteries to meet the power supply requirements of the load devices. Summary of the invention

[0003] One objective of the embodiments of the present disclosure is to provide a new technical solution for cluster-level management of multiple batteries.

[0004] According to a first aspect of the present disclosure, a cluster-level management system for multiple batteries is provided, the system comprising: a first conversion circuit, wherein a first end of the first conversion circuit is electrically connected to a first battery pack of the system; a first isolation circuit, wherein a first end of the first isolation circuit is electrically connected to a second end of the first conversion circuit; a second conversion circuit, wherein a first end of the second conversion circuit is electrically connected to a second battery pack of the system, and a second end of the second conversion circuit is electrically connected to a first end of the first isolation circuit; a third conversion circuit, wherein a first end of the third conversion circuit is electrically connected to a second end of the first isolation circuit, and a second end of the third conversion circuit is used to be electrically connected to a load device of the system; A cluster-level management circuit, wherein the cluster-level management circuit is communicatively connected with the first conversion circuit, the second conversion circuit and the third conversion circuit respectively, and the cluster-level management circuit has a power supply mode. When the cluster-level management circuit is in the power supply mode, the cluster-level management circuit obtains battery characteristic information of the first battery group and the second battery group, and when the battery characteristic information reflects that the first battery group or the second battery group meets the set power supply conditions, the cluster-level management circuit controls the first conversion circuit and the third conversion circuit to operate, or controls the second conversion circuit and the third conversion circuit to operate.

[0005] Optionally, the first conversion circuit includes a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube, a connection point between the drain of the first MOS tube and the drain of the third MOS tube is electrically connected to the positive electrode of the first battery pack, a connection point between the source of the second MOS tube and the source of the fourth MOS tube is electrically connected to the negative electrode of the first battery pack, a connection point between the source of the first MOS tube and the drain of the second MOS tube is electrically connected to the negative electrode of the first end of the first isolation circuit, and a connection point between the source of the third MOS tube and the drain of the fourth MOS tube is electrically connected to the positive electrode of the first end of the first isolation circuit.

[0006] Optionally, the second conversion circuit includes a ninth MOS tube, a tenth MOS tube, an eleventh MOS tube and a twelfth MOS tube, the connection point between the drain of the ninth MOS tube and the drain of the eleventh MOS tube is electrically connected to the positive electrode of the second battery pack, the connection point between the source of the tenth MOS tube and the source of the twelfth MOS tube is electrically connected to the negative electrode of the second battery pack, the connection point between the source of the ninth MOS tube and the drain of the tenth MOS tube is electrically connected to the negative electrode of the first end of the first isolation circuit, and the connection point between the source of the eleventh MOS tube and the drain of the twelfth MOS tube is electrically connected to the positive electrode of the first end of the first isolation circuit.

[0007] Optionally, the third conversion circuit includes a fifth MOS tube, a sixth MOS tube, a seventh MOS tube and an eighth MOS tube, a connection point between the drain of the fifth MOS tube and the drain of the seventh MOS tube is electrically connected to the positive electrode of the load device of the system, a connection point between the source of the sixth MOS tube and the source of the eighth MOS tube is electrically connected to the negative electrode of the load device, a connection point between the source of the fifth MOS tube and the drain of the sixth MOS tube is electrically connected to the positive electrode of the second end of the first isolation circuit, and a connection point between the source of the seventh MOS tube and the drain of the eighth MOS tube is electrically connected to the negative electrode of the second end of the first isolation circuit.

[0008] Optionally, the first isolation circuit includes a first inductor, a second inductor, a first capacitor, a second capacitor and a first transformer, the first end of the first inductor serves as the positive pole of the first end of the first isolation circuit, the second end of the first inductor is connected to the first end of the primary coil of the first transformer, the first end of the first capacitor serves as the negative pole of the first end of the first isolation circuit, the second end of the first capacitor is connected to the second end of the primary coil of the first transformer, the first end of the second inductor serves as the positive pole of the second end of the first isolation circuit, the second end of the second inductor is connected to the first end of the secondary coil of the first transformer, the first end of the second capacitor serves as the negative pole of the second end of the first isolation circuit, and the second end of the second capacitor is connected to the second end of the secondary coil of the first transformer.

[0009] Optionally, the system further includes a second isolation circuit and a switch circuit, the second isolation circuit is arranged between the second conversion circuit and the first isolation circuit, a first end of the switch circuit is electrically connected to a first end of the first conversion circuit, a second end of the switch circuit is electrically connected to a first end of the second conversion circuit, and a third end of the switch circuit is used to be electrically connected to a power generation device of the system; The cluster-level management circuit is communicatively connected with the switch circuit and the second isolation circuit respectively, and the cluster-level management circuit also has a first charging mode and a second charging mode. When in the first charging mode, the cluster-level management circuit controls the first and third ends of the switch circuit to be turned on, and controls the first conversion circuit and the second conversion circuit to work, so that the second battery pack is charged; when in the second charging mode, the cluster-level management circuit controls the second and third ends of the switch circuit to be turned on, and controls the first conversion circuit and the second conversion circuit to work, so that the first battery pack is charged.

[0010] Optionally, the switch circuit includes a seventh switch and an eighth switch, the first end of the seventh switch serves as the first end of the switch circuit, the first end of the eighth switch serves as the second end of the switch circuit, and the connection point between the second end of the seventh switch and the second end of the eighth switch serves as the third end of the switch circuit; Among them, the cluster-level management circuit is communicated with the seventh switch and the eighth switch respectively. When the cluster-level management circuit is in the first charging mode, the seventh switch is closed and the eighth switch is opened; when the cluster-level management circuit is in the second charging mode, the seventh switch is opened and the eighth switch is closed.

[0011] Optionally, the second isolation circuit includes a third switch, a fourth switch, a fifth switch, a sixth switch, a third inductor, a fourth inductor, a third capacitor, a fourth capacitor and a second transformer, the second end of the first conversion circuit is electrically connected to the first end of the third switch, the second end of the third switch is electrically connected to the first end of the fourth switch, and the second end of the fourth switch is electrically connected to the second end of the second conversion circuit; The first end of the fifth switch is electrically connected to the first end of the fourth switch, the positive electrode of the second end of the fifth switch is electrically connected to the first end of the third inductor, the second end of the third inductor is electrically connected to the first end of the primary coil of the second transformer, the first end of the third capacitor is electrically connected to the negative electrode of the second end of the fifth switch, and the second end of the third capacitor is electrically connected to the second end of the primary coil of the second transformer; The first end of the sixth switch is electrically connected to the second end of the fourth switch, the positive electrode of the second end of the sixth switch is electrically connected to the first end of the fourth inductor, the second end of the fourth inductor is electrically connected to the first end of the secondary coil of the second transformer, the first end of the fourth capacitor is electrically connected to the negative electrode of the second end of the sixth switch, and the second end of the fourth capacitor is electrically connected to the second end of the secondary coil of the second transformer; The cluster-level management circuit is communicatively connected with the third switch, the fourth switch, the fifth switch and the sixth switch respectively. When the cluster-level management circuit is in the power supply mode, the third switch and the fourth switch are closed, and the fifth switch and the sixth switch are opened; when the cluster-level management circuit is in the first charging mode or the second charging mode, the third switch and the fourth switch are opened, and the fifth switch and the sixth switch are closed.

[0012] Optionally, the first battery group and the second battery group are both composed of first batteries connected in series, the battery characteristic information of the first battery group includes the remaining power of the first battery in the first battery group, and the battery characteristic information of the second battery group includes the remaining power of the first battery in the second battery group; The battery characteristic information reflects that the first battery group or the second battery group meets the set power supply condition, including: the remaining power of the first battery in the first battery group is greater than or equal to the first set power and the maximum power difference between the first batteries in the first battery group is less than or equal to the set difference, and / or the remaining power of the first battery in the second battery group is greater than or equal to the first set power and the maximum power difference between the first batteries in the second battery group is less than or equal to the set difference; The first battery is configured with a balancing circuit. When the battery characteristic information reflects that the first battery group or the second battery group does not meet the set power supply conditions, the cluster-level management circuit determines whether the remaining power of the first battery group or the second battery group is less than or equal to the second set power. When the remaining power of the first battery group is less than or equal to the second set power, it switches to the second charging mode; when the remaining power of the second battery group is less than or equal to the second set power, it switches to the first charging mode; when the remaining power of the first battery group or the second battery group is greater than the second set power, the balancing circuit configured for the first battery in the first battery group or the second battery group is controlled to operate.

[0013] Optionally, the balancing circuit includes a first resistor, a second resistor and a thirteenth MOS tube, the first end of the first resistor is electrically connected to the positive electrode of the first battery, the second end of the first resistor is electrically connected to the drain of the thirteenth MOS tube, the first end of the second resistor is electrically connected to the negative electrode of the first battery, the second end of the second resistor is electrically connected to the source of the thirteenth MOS tube, and the cluster-level management circuit is connected to the gate of the thirteenth MOS tube.

[0014] A beneficial effect of the embodiments of the present disclosure is that the cluster-level management system for multiple batteries provided by the present invention can convert the direct current output by the first battery group into direct current that meets the requirements of the load device through the cooperation of the first conversion circuit, the first isolation circuit and the third conversion circuit to charge the load device, and then convert the direct current output by the second battery group into direct current that meets the requirements of the load device through the cooperation of the second conversion circuit, the first isolation circuit and the third conversion circuit to enable multiple batteries to charge the load device, effectively ensuring the power supply requirements of the load device and expanding the application scenarios of the cluster-level management system for multiple batteries.

[0015] Other features and advantages of the embodiments of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the embodiments of the present disclosure.

[0017] Figure 1 is a schematic structural diagram of a cluster-level management system for multiple batteries according to an embodiment; Figure 2 is a circuit diagram of a cluster-level management system for multiple batteries according to one embodiment; Figure 3 is a circuit diagram of an equalization circuit according to one embodiment. DETAILED DESCRIPTION

[0018] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0019] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0020] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0021] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0022] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0023] See also Figure 1 As shown, the cluster-level management system of multiple batteries according to the embodiment of the present disclosure is described.

[0024] The multi-battery cluster management system of the embodiment of the present disclosure includes: A first conversion circuit 10, wherein a first end of the first conversion circuit 10 is electrically connected to a first battery pack (DC1 end) of the system; A first isolation circuit 40, wherein a first end of the first isolation circuit 40 is electrically connected to a second end of the first conversion circuit 10; A second conversion circuit 20, wherein a first end of the second conversion circuit 20 is electrically connected to a second battery pack (DC2 end) of the system, and a second end of the second conversion circuit 20 is electrically connected to a first end of the first isolation circuit 40; A third conversion circuit 30, wherein a first end of the third conversion circuit 30 is electrically connected to a second end of the first isolation circuit 40, and a second end of the third conversion circuit 30 is used to be electrically connected to a load device 200 (LOAD end) of the system; The cluster-level management circuit is communicatively connected with the first conversion circuit 10, the second conversion circuit 20 and the third conversion circuit 30 respectively. The cluster-level management circuit has a power supply mode. When the cluster-level management circuit is in the power supply mode, the cluster-level management circuit obtains battery characteristic information of the first battery group and the second battery group. When the battery characteristic information reflects that the first battery group or the second battery group meets the set power supply conditions, the first conversion circuit 10 and the third conversion circuit 30 are controlled to operate, or the second conversion circuit 20 and the third conversion circuit 30 are controlled to operate.

[0025] In this embodiment, the cluster-level management circuit may be a controller having functions such as communication, data transmission and reception, and data processing.

[0026] In this embodiment, the cluster-level management circuit can output PWM wave signals with different duty cycles to the first conversion circuit 10, the second conversion circuit 20 and the third conversion circuit 30, so that the first conversion circuit 10, the second conversion circuit 20 and the third conversion circuit 30 work, that is, the first conversion circuit 10, the second conversion circuit 20 and the third conversion circuit 30 respond to the PWM wave signals with different duty cycles and perform AC-DC conversion with corresponding conversion efficiency.

[0027] In this embodiment, a first switch K1 is further provided between the first conversion circuit 10 and the first battery pack, and the first switch K1 can be connected to the cluster-level management circuit for communication, so that when the first battery pack needs to be charged or discharged, the cluster-level management circuit can control the first switch K1 to be closed. A second switch K2 is further provided between the second conversion circuit 20 and the second battery pack, and the second switch K2 can be connected to the cluster-level management circuit for communication, so that when the second battery pack needs to be charged or discharged, the cluster-level management circuit can control the second switch K2 to be closed.

[0028] In this embodiment, the first battery in the first battery group and the first battery in the second battery group are both configured with a BMS chip, and the cluster-level management circuit can obtain the battery characteristic information of the first battery group and the second battery group through the BMS chip configured for the first battery in the first battery group and the first battery in the second battery group. When the battery characteristic information reflects that the first battery group meets the set power supply conditions, the first conversion circuit 10 and the third conversion circuit 30 are controlled to work, that is, the direct current output by the first battery group is converted by the first conversion circuit 10 and the third conversion circuit 30 to obtain direct current that meets the requirements of the load device 200. When the battery characteristic information reflects that the second battery group meets the set power supply conditions, the second conversion circuit 20 and the third conversion circuit 30 are controlled to work, that is, the direct current output by the second battery group is converted by the second conversion circuit 20 and the third conversion circuit 30 to obtain direct current that meets the requirements of the load device 200.

[0029] In other words, through the cooperation of the first conversion circuit 10, the first isolation circuit 40 and the third conversion circuit 30, the DC power output by the first battery group is converted into DC power that meets the requirements of the load device 200 to charge the load device 200, and then through the cooperation of the second conversion circuit 20, the first isolation circuit 40 and the third conversion circuit 30, the DC power output by the second battery group is converted into DC power that meets the requirements of the load device 200, so that multiple batteries can charge the load device 200, effectively ensuring the power supply requirements of the load device 200 and expanding the application scenarios of the cluster-level management system of multiple batteries.

[0030] In some embodiments, in order to realize the DC-AC conversion of the DC power output by the first battery pack by the first conversion circuit 10, the first conversion circuit 10 includes a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3 and a fourth MOS tube Q4, a connection point between the drain of the first MOS tube Q1 and the drain of the third MOS tube Q3 is electrically connected to the positive electrode of the first battery pack, a connection point between the source of the second MOS tube Q2 and the source of the fourth MOS tube Q4 is electrically connected to the negative electrode of the first battery pack, a connection point between the source of the first MOS tube Q1 and the drain of the second MOS tube Q2 is electrically connected to the negative electrode of the first end of the first isolation circuit 40, and a connection point between the source of the third MOS tube Q3 and the drain of the fourth MOS tube Q4 is electrically connected to the positive electrode of the first end of the first isolation circuit 40.

[0031] In some embodiments, in order to realize the DC-AC conversion of the DC power output by the second battery pack by the second conversion circuit 20, the second conversion circuit 20 includes a ninth MOS transistor Q9, a tenth MOS transistor Q10, an eleventh MOS transistor Q11 and a twelfth MOS transistor Q12, the connection point of the drain of the ninth MOS transistor Q9 and the drain of the eleventh MOS transistor Q11 is electrically connected to the positive electrode of the second battery pack, the connection point of the source of the tenth MOS transistor Q10 and the source of the twelfth MOS transistor Q12 is electrically connected to the negative electrode of the second battery pack, the connection point of the source of the ninth MOS transistor Q9 and the drain of the tenth MOS transistor Q10 is electrically connected to the first negative electrode of the first isolation circuit 40, and the connection point of the source of the eleventh MOS transistor Q11 and the drain of the twelfth MOS transistor Q12 is electrically connected to the first positive electrode of the first isolation circuit 40.

[0032] In some embodiments, in order to realize the AC-DC conversion of the AC power output by the isolation circuit by the third conversion circuit 30, the third conversion circuit 30 includes a fifth MOS transistor Q5, a sixth MOS transistor Q6, a seventh MOS transistor Q7 and an eighth MOS transistor Q8, a connection point between the drain of the fifth MOS transistor Q5 and the drain of the seventh MOS transistor Q7 is electrically connected to the positive electrode of the load device 200 of the system, a connection point between the source of the sixth MOS transistor Q6 and the source of the eighth MOS transistor Q8 is electrically connected to the negative electrode of the load device 200, a connection point between the source of the fifth MOS transistor Q5 and the drain of the sixth MOS transistor Q6 is electrically connected to the positive electrode of the second end of the first isolation circuit 40, and a connection point between the source of the seventh MOS transistor Q7 and the drain of the eighth MOS transistor Q8 is electrically connected to the negative electrode of the second end of the first isolation circuit 40.

[0033] In some embodiments, in order to achieve electrical isolation of the third conversion circuit 30 from the first conversion circuit 10 and the second conversion circuit 20, the first isolation circuit 40 includes a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2 and a first transformer, the first end of the first inductor L1 serves as the positive pole of the first end of the first isolation circuit 40, the second end of the first inductor L1 is connected to the first end of the primary coil of the first transformer, the first end of the first capacitor C1 serves as the negative pole of the first end of the first isolation circuit 40, the second end of the first capacitor C1 is connected to the second end of the primary coil of the first transformer, the first end of the second inductor L2 serves as the positive pole of the second end of the first isolation circuit 40, the second end of the second inductor L2 is connected to the first end of the secondary coil of the first transformer, the first end of the second capacitor C2 serves as the negative pole of the second end of the first isolation circuit 40, and the second end of the second capacitor C2 is connected to the second end of the secondary coil of the first transformer.

[0034] In some examples, the cluster-level management circuit is connected to the gates of the first MOS tube Q1 to the eighth MOS tube Q8, and the cluster-level management circuit can output PWM wave signals with different duty cycles to the gates of the first MOS tube Q1 to the eighth MOS tube Q8. When the first conversion circuit 10 and the third conversion circuit 30 perform DC-DC conversion on the DC power output by the first battery group, the cluster-level management circuit can control a group of MOS tubes, including the first MOS tube Q1, the fourth MOS tube Q4, the fifth MOS tube Q5 and the eighth MOS tube Q8, to be turned on, and then control another group of MOS tubes, including the second MOS tube Q2, the third MOS tube Q3, the sixth MOS tube Q6 and the seventh MOS tube Q7, to be turned on, and the two groups of MOS tubes are alternately turned on to achieve the DC-DC conversion of the DC power output by the first battery group by the first conversion circuit 10 and the third conversion circuit 30. When the second conversion circuit 20 and the third conversion circuit 30 perform DC-DC conversion on the DC power output by the second battery pack, the cluster-level management circuit can control a group of MOS tubes, namely the ninth MOS tube Q9, the twelfth MOS tube Q12, the fifth MOS tube Q5 and the eighth MOS tube Q8, to be turned on, and then control another group of MOS tubes, namely the tenth MOS tube Q10, the eleventh MOS tube Q11, the sixth MOS tube Q6 and the seventh MOS tube Q7, to be turned on. The two groups of MOS tubes are alternately turned on to achieve DC-DC conversion of the DC power output by the second battery pack by the second conversion circuit 20 and the third conversion circuit 30.

[0035] In some embodiments, in order to achieve the purpose of reducing the manufacturing cost of the system by multiplexing the first conversion circuit 10 and the second conversion circuit 20, the DC power provided by the power generation device 300 can charge the first battery pack or the second battery pack, the system further includes a second isolation circuit 50 and a switch circuit, the second isolation circuit 50 is arranged between the second conversion circuit 20 and the first isolation circuit 40, the first end of the switch circuit is electrically connected to the first end of the first conversion circuit 10, the second end of the switch circuit is electrically connected to the first end of the second conversion circuit 20, and the third end of the switch circuit is used to be electrically connected to the power generation device 300 of the system; The cluster-level management circuit is communicatively connected with the switch circuit and the second isolation circuit 50 respectively. The cluster-level management circuit also has a first charging mode and a second charging mode. When in the first charging mode, the cluster-level management circuit controls the first and third ends of the switch circuit to be turned on, and controls the first conversion circuit 10 and the second conversion circuit 20 to operate, so that the second battery pack is charged; when in the second charging mode, the cluster-level management circuit controls the second and third ends of the switch circuit to be turned on, and controls the first conversion circuit 10 and the second conversion circuit 20 to operate, so that the first battery pack is charged.

[0036] In this embodiment, the power generation device 300 is, for example, a clean energy power generation device 300 such as a wind turbine, a solar photovoltaic panel, etc., and the power generation device 300 can output direct current as a power supply for the first battery pack and the second battery pack.

[0037] In some embodiments, in order to enable the cluster-level management circuit to control the conduction between the first end and the third end or the conduction between the second end and the third end of the switch circuit, the switch circuit includes a seventh switch K7 and an eighth switch K8, the first end of the seventh switch K7 serves as the first end of the switch circuit, the first end of the eighth switch K8 serves as the second end of the switch circuit, and the connection point between the second end of the seventh switch K7 and the second end of the eighth switch K8 serves as the third end of the switch circuit; Among them, the cluster-level management circuit is communicated with the seventh switch K7 and the eighth switch K8 respectively. When the cluster-level management circuit is in the first charging mode, the seventh switch K7 is closed and the eighth switch K8 is opened; when the cluster-level management circuit is in the second charging mode, the seventh switch K7 is opened and the eighth switch K8 is closed.

[0038] In this embodiment, when the cluster-level management circuit is in the first charging mode, the seventh switch K7 is closed, the eighth switch K8 is opened, and the DC power of the power generation device 300 is converted by the DC-DC conversion of the first conversion circuit 10, the second isolation circuit 50, and the second conversion circuit 20, so as to charge the second battery pack. When the cluster-level management circuit is in the second charging mode, the seventh switch K7 is opened, the eighth switch K8 is closed, and the DC power of the power generation device 300 is converted by the DC-DC conversion of the second conversion circuit 20, the second isolation circuit 50, and the first conversion circuit 10, so as to charge the second battery pack.

[0039] In some embodiments, in order to enable the first conversion circuit 10, the second isolation circuit 50 and the second conversion circuit 20 to charge the first battery pack or the second battery pack, the second isolation circuit 50 includes a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a third inductor L3, a fourth inductor L4, a third capacitor C3, a fourth capacitor C4 and a second transformer, the second end of the first conversion circuit 10 is electrically connected to the first end of the third switch K3, the second end of the third switch K3 is electrically connected to the first end of the fourth switch K4, and the second end of the fourth switch K4 is electrically connected to the second end of the second conversion circuit 20; A first end of the fifth switch K5 is electrically connected to a first end of the fourth switch K4, a positive electrode of a second end of the fifth switch K5 is electrically connected to a first end of a third inductor L3, a second end of the third inductor L3 is electrically connected to a first end of a primary coil of a second transformer, a first end of a third capacitor C3 is electrically connected to a negative electrode of a second end of the fifth switch K5, and a second end of the third capacitor C3 is electrically connected to a second end of the primary coil of the second transformer; A first end of the sixth switch K6 is electrically connected to a second end of the fourth switch K4, a positive electrode of the second end of the sixth switch K6 is electrically connected to a first end of a fourth inductor L4, a second end of the fourth inductor L4 is electrically connected to a first end of a secondary coil of the second transformer, a first end of a fourth capacitor C4 is electrically connected to a negative electrode of a second end of the sixth switch K6, and a second end of the fourth capacitor C4 is electrically connected to a second end of the secondary coil of the second transformer; The cluster-level management circuit is respectively communicated with the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6. When the cluster-level management circuit is in the power supply mode, the third switch K3 and the fourth switch K4 are closed, and the fifth switch K5 and the sixth switch K6 are disconnected; when the cluster-level management circuit is in the first charging mode or the second charging mode, the third switch K3 and the fourth switch K4 are disconnected, and the fifth switch K5 and the sixth switch K6 are closed.

[0040] In some embodiments, in order to improve the charging stability of the first battery group or the second battery group, the first battery group and the second battery group are both composed of first batteries connected in series, such as Figure 1 As shown, the first battery Bat1-the first battery Bat4 constitute a first battery group, and the first battery Bat5-the first battery Bat7 constitute a second battery group. The battery characteristic information of the first battery group includes the remaining power of the first battery in the first battery group, and the battery characteristic information of the second battery group includes the remaining power of the first battery in the second battery group; The battery characteristic information reflects that the first battery group or the second battery group meets the set power supply condition, including: the remaining power of the first battery in the first battery group is greater than or equal to the first set power and the maximum power difference between the first batteries in the first battery group is less than or equal to the set difference, and / or the remaining power of the first battery in the second battery group is greater than or equal to the first set power and the maximum power difference between the first batteries in the second battery group is less than or equal to the set difference; The first battery is configured with a balancing circuit 60. When the battery characteristic information reflects that the first battery group or the second battery group does not meet the set power supply conditions, the cluster-level management circuit determines whether the remaining power of the first battery group or the second battery group is less than or equal to the second set power. When the remaining power of the first battery group is less than or equal to the second set power, the circuit switches to the second charging mode; when the remaining power of the second battery group is less than or equal to the second set power, the circuit switches to the first charging mode; when the remaining power of the first battery group or the second battery group is greater than the second set power, the circuit controls the balancing circuit 60 configured for the first battery in the first battery group or the second battery group to operate.

[0041] In this embodiment, the difference is set to, for example, 2%, 5% or 10%, etc., which is not limited here.

[0042] In this embodiment, in order to ensure that the first battery pack and the second battery pack can supply power to the load device 200 with sufficient power, the first set power is less than the second set power, and the first set power is, for example, 60%, 70% or 80%, etc., which is not limited here. The second set power is, for example, 65%, 75% or 85%, etc., which is not limited here.

[0043] In this embodiment, when the remaining power of the first battery group is less than or equal to the second set power, the second charging mode is switched to, and the power generation device 300 charges the first battery group through the first conversion circuit 10, the second isolation circuit 50 and the second conversion circuit 20, and when the cluster-level management circuit detects that the remaining power of the first battery group reaches the second set power, the equalization circuit 60 configured for the first battery in the first battery group is controlled to perform battery equalization, so that the difference in the remaining power of the first battery in the first battery group is less than the set difference. When the remaining power of the second battery group is less than or equal to the second set power, the first charging mode is switched to, and the power generation device 300 charges the second battery group through the first conversion circuit 10, the second isolation circuit 50 and the second conversion circuit 20, and when the cluster-level management circuit detects that the remaining power of the second battery group reaches the second set power, the equalization circuit 60 configured for the first battery in the second battery group is controlled to perform battery equalization, so that the difference in the remaining power of the first battery in the second battery group is less than the set difference.

[0044] In this embodiment, when the remaining power of the first battery group or the second battery group is greater than the second set power, the balancing circuit 60 configured for the first battery in the first battery group or the second battery group is controlled to operate, so that the first battery in the first battery group or the second battery group completes battery balancing under the premise that the remaining power of the first battery in the first battery group or the second battery group is greater than or equal to the first set power.

[0045] In some embodiments, in order to achieve balancing of the first battery, as Figure 3 As shown, the balancing circuit 60 includes a first resistor R1, a second resistor R2 and a thirteenth MOS transistor Q13, a first end of the first resistor R1 is electrically connected to the positive electrode of the first battery Bat1, a second end of the first resistor R1 is electrically connected to the drain of the thirteenth MOS transistor Q13, a first end of the second resistor R2 is electrically connected to the negative electrode of the first battery Bat1, a second end of the second resistor R2 is electrically connected to the source of the thirteenth MOS transistor, and the cluster-level management circuit is connected to the gate of the thirteenth MOS transistor Q13.

[0046] In other words, by setting the first resistor R1, the second resistor R2 and the thirteenth MOS tube Q13, it can be achieved that under the control of the cluster-level management circuit, the first battery consumes electric energy through the first resistor R1 and the second resistor R2, so as to achieve that the maximum circuit difference of the first battery of the first battery group or the second battery group is less than or equal to the set difference, so as to achieve the purpose of battery balancing.

[0047] Embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present invention is defined by the appended claims.

Claims

1. A multi-battery cluster management system, characterized in that: The system comprises: a first conversion circuit, wherein a first end of the first conversion circuit is electrically connected to a first battery pack of the system; a first isolation circuit, wherein a first end of the first isolation circuit is electrically connected to a second end of the first conversion circuit; a second conversion circuit, wherein a first end of the second conversion circuit is electrically connected to a second battery pack of the system, and a second end of the second conversion circuit is electrically connected to a first end of the first isolation circuit; a third conversion circuit, wherein a first end of the third conversion circuit is electrically connected to a second end of the first isolation circuit, and a second end of the third conversion circuit is used to be electrically connected to a load device of the system; A cluster-level management circuit, wherein the cluster-level management circuit is communicatively connected with the first conversion circuit, the second conversion circuit and the third conversion circuit respectively, and the cluster-level management circuit has a power supply mode. When the cluster-level management circuit is in the power supply mode, the cluster-level management circuit obtains battery characteristic information of the first battery group and the second battery group, and when the battery characteristic information reflects that the first battery group or the second battery group meets the set power supply conditions, the cluster-level management circuit controls the first conversion circuit and the third conversion circuit to operate, or controls the second conversion circuit and the third conversion circuit to operate.

2. The system according to claim 1, characterized in that The first conversion circuit includes a first MOS tube, a second MOS tube, a third MOS tube and a fourth MOS tube, a connection point between the drain of the first MOS tube and the drain of the third MOS tube is electrically connected to the positive electrode of the first battery pack, a connection point between the source of the second MOS tube and the source of the fourth MOS tube is electrically connected to the negative electrode of the first battery pack, a connection point between the source of the first MOS tube and the drain of the second MOS tube is electrically connected to the negative electrode of the first end of the first isolation circuit, and a connection point between the source of the third MOS tube and the drain of the fourth MOS tube is electrically connected to the positive electrode of the first end of the first isolation circuit.

3. The system according to claim 1, characterized in that The second conversion circuit includes a ninth MOS tube, a tenth MOS tube, an eleventh MOS tube and a twelfth MOS tube, a connection point between the drain of the ninth MOS tube and the drain of the eleventh MOS tube is electrically connected to the positive electrode of the second battery pack, a connection point between the source of the tenth MOS tube and the source of the twelfth MOS tube is electrically connected to the negative electrode of the second battery pack, a connection point between the source of the ninth MOS tube and the drain of the tenth MOS tube is electrically connected to the negative electrode of the first end of the first isolation circuit, and a connection point between the source of the eleventh MOS tube and the drain of the twelfth MOS tube is electrically connected to the positive electrode of the first end of the first isolation circuit.

4. The system according to claim 1, characterized in that The third conversion circuit includes a fifth MOS tube, a sixth MOS tube, a seventh MOS tube and an eighth MOS tube, a connection point between the drain of the fifth MOS tube and the drain of the seventh MOS tube is electrically connected to the positive electrode of the load device of the system, a connection point between the source of the sixth MOS tube and the source of the eighth MOS tube is electrically connected to the negative electrode of the load device, a connection point between the source of the fifth MOS tube and the drain of the sixth MOS tube is electrically connected to the positive electrode of the second end of the first isolation circuit, and a connection point between the source of the seventh MOS tube and the drain of the eighth MOS tube is electrically connected to the negative electrode of the second end of the first isolation circuit.

5. The system according to claim 1, characterized in that The first isolation circuit includes a first inductor, a second inductor, a first capacitor, a second capacitor and a first transformer, wherein the first end of the first inductor serves as the positive pole of the first end of the first isolation circuit, the second end of the first inductor is connected to the first end of the primary coil of the first transformer, the first end of the first capacitor serves as the negative pole of the first end of the first isolation circuit, the second end of the first capacitor is connected to the second end of the primary coil of the first transformer, the first end of the second inductor serves as the positive pole of the second end of the first isolation circuit, the second end of the second inductor is connected to the first end of the secondary coil of the first transformer, the first end of the second capacitor serves as the negative pole of the second end of the first isolation circuit, and the second end of the second capacitor is connected to the second end of the secondary coil of the first transformer.

6. The system according to claim 1, characterized in that The system further includes a second isolation circuit and a switch circuit, wherein the second isolation circuit is arranged between the second conversion circuit and the first isolation circuit, a first end of the switch circuit is electrically connected to a first end of the first conversion circuit, a second end of the switch circuit is electrically connected to a first end of the second conversion circuit, and a third end of the switch circuit is used to be electrically connected to a power generation device of the system; The cluster-level management circuit is communicatively connected with the switch circuit and the second isolation circuit respectively, and the cluster-level management circuit also has a first charging mode and a second charging mode. When in the first charging mode, the cluster-level management circuit controls the first and third ends of the switch circuit to be turned on, and controls the first conversion circuit and the second conversion circuit to work, so that the second battery pack is charged; when in the second charging mode, the cluster-level management circuit controls the second and third ends of the switch circuit to be turned on, and controls the first conversion circuit and the second conversion circuit to work, so that the first battery pack is charged.

7. The system according to claim 6, characterized in that The switch circuit includes a seventh switch and an eighth switch, wherein the first end of the seventh switch serves as the first end of the switch circuit, the first end of the eighth switch serves as the second end of the switch circuit, and the connection point between the second end of the seventh switch and the second end of the eighth switch serves as the third end of the switch circuit; Among them, the cluster-level management circuit is communicated with the seventh switch and the eighth switch respectively. When the cluster-level management circuit is in the first charging mode, the seventh switch is closed and the eighth switch is opened; when the cluster-level management circuit is in the second charging mode, the seventh switch is opened and the eighth switch is closed.

8. The system according to claim 6, characterized in that The second isolation circuit includes a third switch, a fourth switch, a fifth switch, a sixth switch, a third inductor, a fourth inductor, a third capacitor, a fourth capacitor and a second transformer, the second end of the first conversion circuit is electrically connected to the first end of the third switch, the second end of the third switch is electrically connected to the first end of the fourth switch, and the second end of the fourth switch is electrically connected to the second end of the second conversion circuit; The first end of the fifth switch is electrically connected to the first end of the fourth switch, the positive electrode of the second end of the fifth switch is electrically connected to the first end of the third inductor, the second end of the third inductor is electrically connected to the first end of the primary coil of the second transformer, the first end of the third capacitor is electrically connected to the negative electrode of the second end of the fifth switch, and the second end of the third capacitor is electrically connected to the second end of the primary coil of the second transformer; The first end of the sixth switch is electrically connected to the second end of the fourth switch, the positive electrode of the second end of the sixth switch is electrically connected to the first end of the fourth inductor, the second end of the fourth inductor is electrically connected to the first end of the secondary coil of the second transformer, the first end of the fourth capacitor is electrically connected to the negative electrode of the second end of the sixth switch, and the second end of the fourth capacitor is electrically connected to the second end of the secondary coil of the second transformer; The cluster-level management circuit is respectively connected to the third switch, the fourth switch, the fifth switch and the sixth switch for communication. When the cluster-level management circuit is in the power supply mode, the third switch and the fourth switch are closed, and the fifth switch and the sixth switch are opened; When the cluster-level management circuit is in the first charging mode or the second charging mode, the third switch and the fourth switch are opened, and the fifth switch and the sixth switch are closed.

9. The system according to claim 6, characterized in that The first battery group and the second battery group are both composed of first batteries connected in series, the battery characteristic information of the first battery group includes the remaining power of the first batteries in the first battery group, and the battery characteristic information of the second battery group includes the remaining power of the first batteries in the second battery group; The battery characteristic information reflects that the first battery group or the second battery group meets the set power supply condition, including: the remaining power of the first battery in the first battery group is greater than or equal to the first set power and the maximum power difference between the first batteries in the first battery group is less than or equal to the set difference, and / or the remaining power of the first battery in the second battery group is greater than or equal to the first set power and the maximum power difference between the first batteries in the second battery group is less than or equal to the set difference; The first battery is configured with a balancing circuit. When the battery characteristic information reflects that the first battery group or the second battery group does not meet the set power supply conditions, the cluster-level management circuit determines whether the remaining power of the first battery group or the second battery group is less than or equal to the second set power. When the remaining power of the first battery group is less than or equal to the second set power, it switches to the second charging mode; when the remaining power of the second battery group is less than or equal to the second set power, it switches to the first charging mode; when the remaining power of the first battery group or the second battery group is greater than the second set power, the balancing circuit configured for the first battery in the first battery group or the second battery group is controlled to operate.

10. The system according to claim 9, characterized in that The balancing circuit includes a first resistor, a second resistor and a thirteenth MOS tube, wherein a first end of the first resistor is electrically connected to the positive electrode of the first battery, a second end of the first resistor is electrically connected to the drain of the thirteenth MOS tube, a first end of the second resistor is electrically connected to the negative electrode of the first battery, a second end of the second resistor is electrically connected to the source of the thirteenth MOS tube, and the cluster-level management circuit is communicatively connected to the gate of the thirteenth MOS tube.

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