Battery management device and system

Abstract

The invention relates to a battery management device, which comprises a battery device, a connection state conversion device, a charging device, a power utilization device and a control device, the battery device is electrically connected with the connection state conversion device; the connection state conversion device is electrically connected with the charging device; the connection state conversion device is electrically connected with the power utilization device; the control device is used for controlling the connection state conversion device to be in a first connection state, a second connection state, a third connection state and a fourth connection state. The device can improve the compatibility of the battery device with different voltage platforms.

Description

[0001] Description of the case

[0002] This application is a divisional application based on the Chinese patent with application date of January 29, 2022, application number 202280006983.2, and invention name “Battery management device, system”. Technical Field

[0003] The embodiments of the present application relate to the field of battery technology, and further to a battery management device and system. Background Art

[0004] As energy shortage and environmental pollution become more serious in modern society, electric vehicles have been widely recognized as new energy vehicles since their launch. Conventional household electric vehicles are designed and developed based on the 400-volt voltage platform and quickly occupy the market. The batteries, motors, and related system components of electric vehicles are all suitable for the 400-volt voltage platform, so the market provides charging equipment that is compatible with the 400-volt voltage platform to charge electric vehicles.

[0005] As electric vehicles have higher requirements for driving range and the demand for freight and passenger transportation based on electric vehicles grows, the battery capacity of electric vehicles is getting larger and larger, and the charging time is getting longer and longer. Therefore, electric vehicles and charging equipment based on the 800-volt voltage platform have emerged, which greatly shortens the charging time. However, charging equipment based on the 400-volt voltage platform cannot charge electric vehicles based on the 800-volt voltage platform, and electric vehicles based on the 400-volt voltage platform cannot be charged using charging equipment based on the 800-volt voltage platform. In addition, battery devices based on the 400-volt voltage platform cannot power system components such as motors based on the 800-volt voltage platform, and system components such as motors based on the 400-volt voltage platform are also not compatible with battery devices based on the 800-volt voltage platform. Summary of the invention

[0006] The embodiments of the present application provide a battery management device, a connection state conversion device and a battery management system, in order to solve the technical problem that the battery device is incompatible with different voltage platforms.

[0007] In a first aspect, the present application provides a battery management device, which includes: a battery device, a connection state conversion device, and a control device; the battery device includes: a first battery group and a second battery group, wherein the negative electrode of the first battery group is connected to the positive electrode of the second battery group; the connection state conversion device includes: a first connection state conversion device, a first end of the first connection state conversion device is connected to the positive electrode of the first battery group, and a second end of the first connection state conversion device is connected to the positive electrode of a charging interface; a second connection state conversion device, a first end of the second connection state conversion device is connected to the second end of the first connection state conversion device, and a second end of the second connection state conversion device is connected to the first end of a third connection state conversion device; a second end of the third connection state conversion device is connected to the negative electrode of the charging interface; a fourth connection state conversion device, a first end of the fourth connection state conversion device is connected to the second end of the third connection state conversion device, and a second end of the fourth connection state conversion device is connected to the negative electrode of the second battery group; the control device is used to control the connection state conversion device to be in a first connection state, a second connection state, a third connection state, and a fourth connection state.

[0008] In the embodiment of the present application, when the low-voltage charging platform charging device is charging the high-voltage platform electrical device, the battery management device can charge any one of the two battery packs individually without setting up a boost module. The charging signal access of the low-voltage platform can also be achieved, so that the battery pack can be charged normally, saving costs and solving the problem of related technologies that a boost module is specially added in new energy vehicles to charge the battery normally, which increases costs.

[0009] In some possible embodiments, the battery management device also includes: a fifth connection state conversion device, a first end of the fifth connection state conversion device is connected to the negative electrode of the first battery pack, and a second end of the fifth connection state conversion device is connected to the second end of the second connection state conversion device.

[0010] In some possible embodiments, the battery management device also includes: a sixth connection state conversion device, the first end of the sixth connection state conversion device is connected to the positive electrode of the first battery pack; the second end of the sixth connection state conversion device is connected to the first end of the high-voltage load; the second end of the high-voltage load is connected to the negative electrode of the second battery pack.

[0011] In some possible embodiments, the battery management device also includes: a seventh connection state conversion device, the first end of the seventh connection state conversion device is connected to the negative electrode of the second battery pack; the second end of the seventh connection state conversion device is connected to the second end of the high-voltage load; the first end of the high-voltage load is connected to the positive electrode of the first battery pack.

[0012] In some possible embodiments, the battery management device also includes: an eighth connection state conversion device, a pre-charging resistor; the first end of the pre-charging resistor is electrically connected to the second end of the eighth connection state conversion device; the second end of the pre-charging resistor is connected to the first end of the high-voltage load; the first end of the eighth connection state conversion device is electrically connected to the first end of the first connection state conversion device.

[0013] In some possible embodiments, the battery management device also includes: when the nominal voltage of the battery device is higher than the platform voltage of the charging device, the charging device charges the first battery group through the charging interface, and the control device controls the connection state conversion device to be in a first connection state; the first connection state includes: the first connection state conversion device is turned on, the third connection state conversion device is turned on, the second connection state conversion device is disconnected, and the fourth connection state conversion device is disconnected.

[0014] In the embodiment of the present application, when the low-voltage platform charging device charges the high-voltage platform electrical device, by controlling the connection state conversion device to be in the first connection state, the charging device charges the first battery pack, which can be beneficial to charging safety.

[0015] In some possible embodiments, the battery management device also includes: when the nominal voltage of the battery device is higher than the platform voltage of the charging device, the charging device charges the second battery pack through the charging interface, and the control device controls the connection state conversion device to be in a second connection state; the second connection state includes: the second connection state conversion device is turned on, the fourth connection state conversion device is turned on, the first connection state conversion device is disconnected, and the third connection state conversion device is disconnected.

[0016] In the embodiment of the present application, when the low-voltage platform charging device charges the high-voltage platform electrical device, by controlling the connection state conversion device to be in the second connection state, the charging device charges the second battery pack, which can be beneficial to charging safety.

[0017] In some possible embodiments, the battery management device also includes: when the nominal voltage of the battery device is higher than the platform voltage of the charging device, and the charging device controls the connection state conversion device to be in the first connection state, the control device is also used to control the connection state conversion device to convert from the first connection state to the second connection state when the first battery group reaches a first preset SOC; when the second battery group reaches a second preset SOC, the control device controls the connection state conversion device to convert from the second connection state to the first connection state; when the first battery group reaches a third preset SOC, the control device controls the connection state conversion device to convert from the first connection state to the second connection state; when the second battery group reaches a fourth preset SOC, the control device controls the connection state conversion device to convert from the second connection state to the first connection state.

[0018] In the embodiment of the present application, the first battery group and the second battery group can be charged alternately, so as to ensure that the power of the two battery groups is balanced.

[0019] In some possible embodiments, the battery management device further includes: when the nominal voltage of the battery device is not higher than the platform voltage of the charging device and the charging device charges the battery device through the charging interface, the control device controls the connection state conversion device to be in a third connection state; the third connection state includes: the first connection state conversion device is turned on, the fourth connection state conversion device is turned on, the second connection state conversion device is disconnected, the third connection state conversion device is disconnected, and the fifth connection state conversion device is disconnected.

[0020] A second aspect of the present application provides a connection state conversion device, wherein the connection state conversion device includes a connection relationship of the connection state conversion device described in any one of the first aspects.

[0021] A third aspect of the present application provides a battery management system, the battery system comprising the battery management device described in the first aspect.

[0022] A fourth aspect of the present application provides a battery control method, which is applied to the connection circuit of the connection state conversion device of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Includes a schematic diagram of an application scenario of a battery management device provided by one or more embodiments of the present application.

[0024] Figure 2 Includes a schematic diagram of an application scenario of a battery management device provided by one or more embodiments of the present application.

[0025] Figure 3 Includes a schematic diagram of the working status of a battery management device provided by one or more embodiments of the present application.

[0026] Figure 4 Includes a schematic diagram of the working status of a battery management device provided by one or more embodiments of the present application.

[0027] Figure 5 Includes a schematic diagram of the working status of a battery management device provided by one or more embodiments of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used in the specification of the application in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" in the specification and claims of this application and the above-mentioned accompanying drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned accompanying drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0030] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0033] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0034] The battery device includes a battery that provides electrical energy to an electrical device or a load device. The battery device may include a storage battery or a secondary battery. In terms of the type of battery, the battery device may be a lithium-ion battery, a lithium metal battery, a lead-acid battery, a nickel-chromium battery, a nickel-hydrogen battery, a lithium-sulfur battery, a lithium-air battery, or a sodium-ion battery, etc., which is not specifically limited in the embodiments of the present application. In terms of battery scale, the battery device may include a battery cell / battery monomer, a battery pack, and / or a battery pack. The battery management device, as an example, includes a battery management system (BMS), which can be used to perform safety monitoring, parameter collection and configuration, charge and discharge control and other control and management tasks on the battery device. The embodiments of the present application do not specifically limit the role of the battery management device. SOC (State Of Charge) refers to the state of charge of the battery, also known as the remaining power. It represents the ratio of the remaining capacity of the battery after it has been used for a period of time or has been shelved for a long time to the capacity of its fully charged state, usually expressed as a percentage.

[0035] The charging device, such as a charging pile or a charger, is used to charge the battery device. The charging device can output charging power according to the charging requirements of the BMS to charge the battery device. For example, the charging device can output voltage and current according to the required voltage and required current sent by the BMS, and charge the battery device with the participation of the BMS.

[0036] The electrical device includes various electrical equipment that obtains electrical energy from the battery device, including but not limited to motors, vehicles, ships, and spacecraft. As an example, the motor of a hybrid vehicle is connected to the battery device and obtains electrical energy from the battery device to achieve the driving function. The embodiments of the present application do not specifically limit the electrical device.

[0037] As a common scenario, the charging device charges the battery device, and the battery device provides power to the power-consuming device. However, in some special scenarios, the charging input of the charging device may not match the battery device, and the power output of the battery device may not be compatible with the power-consuming device. For example, a charging pile with a 400-volt voltage platform cannot charge an electric vehicle with an 800-volt voltage platform, and an electric vehicle with a 400-volt voltage platform cannot be charged using a charging pile with an 800-volt voltage platform. In addition, a battery device with a 400-volt voltage platform cannot power system components such as motors with an 800-volt voltage platform, and system components such as motors with a 400-volt voltage platform are also not compatible with a battery device with an 800-volt voltage platform.

[0038] In view of the above situation, an embodiment of the present application provides a battery management device, which is expected to improve the compatibility of the battery device in terms of charging input and / or power output, so as to solve the technical problem that the battery device is incompatible with different voltage platforms.

[0039] Figure 1 A schematic diagram showing an application scenario of a battery management device provided by one or more embodiments of the present application is shown. Figure 1 The invention comprises a battery device, a connection state conversion device and a control device.

[0040] The battery device includes: a first battery pack and a second battery pack. The negative electrode of the first battery pack is connected to the positive electrode of the second battery pack. In the embodiment of the present application, the battery pack is, for example, composed of a plurality of battery cells connected in series and / or in parallel and includes a positive electrode and a negative electrode, the charging device is, for example, a charging pile or a charging gun, and the power-consuming device is, for example, a motor or a vehicle, a ship, an aircraft, etc. Those skilled in the art will understand that in Figure 1 Other electrical components may also be connected in the application scenario shown. For example, main positive and main negative switches or relays may be connected to the positive and negative poles of the battery device respectively as needed, but this embodiment of the present application does not limit this.

[0041] The connection state conversion device includes: a first connection state conversion device K1, a second connection state conversion device K2, a third connection state conversion device K3, and a fourth connection state conversion device K4. Among them, the first connection state conversion device K1, the first end of the first connection state conversion device K1 is connected to the positive electrode of the first battery pack, and the second end of the first connection state conversion device K1 is connected to the positive electrode of the charging interface. The second connection state conversion device K2, the first end of the second connection state conversion device K2 is connected to the second end of the first connection state conversion device K1, and the second end of the second connection state conversion device K2 is connected to the first end of the third connection state conversion device K3. The second end of the third connection state conversion device K3 is connected to the negative electrode of the charging interface. The fourth connection state conversion device K4, the first end of the fourth connection state conversion device K4 is connected to the second end of the third connection state conversion device K3, and the second end of the fourth connection state conversion device K4 is connected to the negative electrode of the second battery pack. Those skilled in the art will understand that the connection state conversion device being turned on means that there is an electrical connection between the two ends of the connection state conversion device, for example, current can flow from one end of the connection state conversion device to the other end of the connection state conversion device, and the connection state conversion device being turned off means that there is no electrical connection between the two ends of the connection state conversion device, for example, current cannot flow from one end of the connection state conversion device to the other end of the connection state conversion device.

[0042] The control device is used to control the connection state conversion device to be in a first connection state, a second connection state, a third connection state, and a fourth connection state. As an example, the control device can be a functional unit implemented by software and / or hardware, for example, the control device includes a processor or a processing unit, which can be coupled with a memory and execute instructions stored in the memory to realize functions such as managing and / or controlling the battery device, and for example, the control device can include a control circuit to realize functions such as managing and / or controlling the battery device. The control device can be used as a part of the BMS or as the BMS itself, and realize the above-mentioned management and / or control functions. In one or more embodiments of the present application, the control device controls the connection state conversion device to convert between different connection states. For example, the control device can send a control signal to the connection state conversion device, so that the connection state conversion device switches from the first connection state to the second connection state in response to detecting the control signal. The embodiment of the present application does not limit the type and implementation form of the control signal. For example, sending a control signal can be realized by sending a control instruction, a high level, a low level, power on, power off, etc.

[0043] In some embodiments of the present application, reference Figure 2The battery management device also includes a fifth connection state conversion device K5, a first end of the fifth connection state conversion device K5 is connected to the negative electrode of the first battery pack, and a second end of the fifth connection state conversion device K5 is connected to the second end of the second connection state conversion device K2.

[0044] In some embodiments of the present application, reference Figure 2 The battery management device further includes a sixth connection state conversion device K6. A first end of the sixth connection state conversion device K6 is connected to the positive electrode of the first battery pack. A second end of the sixth connection state conversion device K6 is connected to a first end of the high voltage load. A second end of the high voltage load is connected to the negative electrode of the second battery pack.

[0045] In some embodiments of the present application, reference Figure 2 The battery management device further includes a seventh connection state conversion device K7, wherein a first end of the seventh connection state conversion device K7 is connected to the negative electrode of the second battery pack, a second end of the seventh connection state conversion device K7 is connected to the second end of the high voltage load, and a first end of the high voltage load is connected to the positive electrode of the first battery pack.

[0046] In some embodiments of the present application, reference Figure 2 The battery management device further includes an eighth connection state conversion device K8, a pre-charging resistor. The first end of the pre-charging resistor is electrically connected to the second end of the eighth connection state conversion device K8. The second end of the pre-charging resistor is connected to the first end of the high voltage load. The first end of the eighth connection state conversion device K8 is electrically connected to the first end of the first connection state conversion device K1.

[0047] The pre-charging resistor refers to the resistor that slowly charges the capacitor at the initial stage of high-voltage power-on of the whole vehicle. The types of pre-charging resistors may include aluminum shell resistors, thermistors, power resistors, cement resistors, ceramic resistors, etc., and the embodiments disclosed in this application are not limited to this. If there is no pre-charging resistor, there may be a risk of excessive charging current and breakdown of the capacitor. High voltage electricity is directly applied to the capacitor, which is equivalent to an instantaneous short circuit. Excessive short-circuit current will damage high-voltage electrical components. The pre-charging circuit composed of the eighth connection state conversion device K8 and the pre-charging resistor can protect the circuit safety.

[0048] Figure 3 This is a schematic diagram of a working state of a battery management device disclosed in an embodiment of the present application. When the nominal voltage of the battery device is higher than the platform voltage of the charging device, the charging device charges the first battery pack through the charging interface, and the control device controls the connection state conversion device to be in the first connection state.

[0049] The first connection state includes: the first connection state conversion device K1 is turned on, the third connection state conversion device K3 is turned on, the second connection state conversion device K2 is turned off, and the fourth connection state conversion device K4 is turned off.

[0050] When the nominal voltage of the battery device is higher than the platform voltage of the charging device, the charging device charges the first battery pack through the charging interface, and the control device controls the connection state conversion device to be in the first connection state. This means that when the nominal voltage of the battery device is higher than the platform voltage of the charging pile, for example, when a charging pile with a 400-volt voltage platform is charging an electric vehicle with an 800-volt voltage platform, if the first battery pack is charged, the control device controls the connection state conversion device to be in the first connection state.

[0051] Figure 4 This is a schematic diagram of the working state of a battery management device disclosed in an embodiment of the present application. When the nominal voltage of the battery device is higher than the platform voltage of the charging device, the charging device charges the second battery pack through the charging interface, and the control device controls the connection state conversion device to be in the second connection state.

[0052] The second connection state includes: the second connection state conversion device K2 is turned on, the fourth connection state conversion device K4 is turned on, the first connection state conversion device K1 is turned off, and the third connection state conversion device K3 is turned off.

[0053] When the nominal voltage of the battery device is higher than the platform voltage of the charging device, the charging device charges the second battery pack through the charging interface, and the control device controls the connection state conversion device to be in the second connection state. This means that when the nominal voltage of the battery device is higher than the platform voltage of the charging pile, for example, when a charging pile with a 400-volt voltage platform is charging an electric vehicle with an 800-volt voltage platform, if the second battery pack is charged, the control device controls the connection state conversion device to be in the second connection state.

[0054] In some embodiments of the present application, the target battery group may be the first battery group or the second battery group, which may be determined according to the remaining power of the battery group. The battery group with low power may be preferentially selected as the target battery group, and the target battery group may be switched when the power of the target battery group exceeds a certain value of the power of another battery group, that is, the target battery group is set to be the battery group that is not being charged, so that the first battery group and the second battery group can be charged alternately to ensure that the power of the two battery groups is balanced.

[0055] In some embodiments of the present application, it is optional to detect whether the first battery pack and the second battery pack and their circuits have a battery fault. When any battery pack or its circuit fails, the non-faulty battery pack will be charged separately. At this time, the non-faulty battery pack is the target battery pack.

[0056] In some embodiments of the present application, optionally, when the remaining power of the first battery group and the second battery group is the same or similar, the battery group with the earlier most recent charging time may be used as the target battery group.

[0057] For example, the high voltage platform is an 800V charging platform, the low voltage platform is a 400V charging platform, the charging device equipped with the first battery pack and the second battery pack is an 800V electric vehicle, and the voltage of the first battery pack and the second battery pack is 400V. When the control device detects that the charging interface is connected to the charging signal of the 400V low voltage platform, it determines that the first battery pack with low remaining power is the target battery pack, and controls the connection state conversion device to convert to the first connection state, thereby realizing charging of the first battery pack.

[0058] In the above scheme, by detecting the charging signal through the control device and switching the connection state of the control connection state conversion device, the power-consuming device with two battery packs connected in series, that is, the power-consuming device supporting the high voltage platform, can split the battery pack into two battery packs supporting the low voltage platform without setting the boost module, and then adapt to the charging signal of the low voltage platform for charging. Compared with setting the boost module for charging adaptation of the low voltage platform, the cost is reduced, thereby solving the problem in the related art that the boost module is specially added for normal battery charging, which increases the cost of the power-consuming device.

[0059] In some embodiments of the present application, optionally, when the nominal voltage of the battery device is higher than the platform voltage of the charging device, and the charging device controls the connection state conversion device to be in the first connection state, the control device is also used to control the connection state conversion device to convert from the first connection state to the second connection state when the first battery pack reaches the first preset SOC. When the second battery pack reaches the second preset SOC, the control device controls the connection state conversion device to convert from the second connection state to the first connection state. When the first battery pack reaches the third preset SOC, the control device controls the connection state conversion device to convert from the first connection state to the second connection state. When the second battery pack reaches the fourth preset SOC, the control device controls the connection state conversion device to convert from the second connection state to the first connection state.

[0060] The two battery packs can be charged alternately to ensure that the charge of the two battery packs is balanced. When the first battery pack reaches the first preset SOC, the control device controls the connection state conversion device to convert from the first connection state to the second connection state, which means that when the charging device charges the first battery pack and the SOC of the first battery pack reaches the first preset SOC, the control device controls the connection state conversion device to convert to the second connection state, and the charging device charges the second battery pack. When the SOC of the second battery pack reaches the second preset SOC, the control device controls the connection state conversion device to convert to the first connection state, and the charging device charges the first battery pack. When the SOC of the first battery pack reaches the third preset SOC, the control device controls the connection state conversion device to convert to the second connection state, and the charging device charges the second battery pack. When the SOC of the second battery pack reaches the fourth preset SOC, the control device controls the connection state conversion device to convert to the first connection state, and the charging device charges the first battery pack.

[0061] In some embodiments of the present application, optionally, each time the battery packs are alternately charged, the SOCs between the battery packs may be consistent. For example, the first preset SOC and the second preset SOC may be the same, and the third preset SOC and the fourth preset SOC may be the same, and the embodiments disclosed in the present application are not limited to this. For example, when the SOC of the first battery pack reaches 20%, the control device controls the connection state conversion device to convert to the second connection state, and the charging device starts to charge the second battery pack. When the SOC of the second battery pack reaches 20%, the control device controls the connection state conversion device to convert to the first connection state, and the charging device continues to charge the first battery pack. When the SOC of the first battery pack reaches 40%, the control device controls the connection state conversion device to convert to the second connection state, and the charging device starts to charge the second battery pack. When the SOC of the second battery pack reaches 40%, the control device controls the connection state conversion device to convert to the first connection state, and the charging device continues to charge the first battery pack. When the SOC of the first battery pack reaches 60%, the control device controls the connection state conversion device to convert to the second connection state, and the charging device starts to charge the second battery pack. When the SOC of the second battery pack reaches 60%, the control device controls the connection state conversion device to convert to the first connection state, and the charging device continues to charge the first battery pack. When the SOC of the first battery pack reaches 80%, the control device controls the connection state conversion device to convert to the second connection state, and the charging device starts to charge the second battery pack. When the SOC of the second battery pack reaches 80%, the control device controls the connection state conversion device to convert to the first connection state, and the charging device continues to charge the first battery pack. When the SOC of the first battery pack reaches 100%, the control device controls the connection state conversion device to convert to the second connection state, and the charging device starts to charge the second battery pack. When the SOC of the second battery pack reaches 100%, charging stops.

[0062] Figure 5 This is a schematic diagram of the working state of a battery management device disclosed in an embodiment of the present application. When the nominal voltage of the battery device is not higher than the platform voltage of the charging device, and the charging device charges the battery device through the charging interface, the control device controls the connection state conversion device to be in the third connection state. The third connection state includes: the first connection state conversion device K1 is turned on, the fourth connection state conversion device K4 is turned on, the second connection state conversion device K2 is disconnected, the third connection state conversion device K3 is disconnected, and the fifth connection state conversion device K5 is disconnected.

[0063] In an embodiment of the present application, the nominal voltage of the power-consuming device is not higher than the platform voltage of the charging device. When the charging device charges the battery device through the charging interface, the control device controls the connection state conversion device to be in the third connection state. For example, when a charging pile with a 400-volt voltage platform is charging an electric vehicle with a 400-volt voltage platform, then in the third connection state, the charging pile charges two battery packs normally at the same time.

[0064] The embodiment of the present application also provides a connection state conversion device, including a connection relationship of the connection state conversion device.

[0065] Among them, the connection state conversion device can be similar to the connection state conversion device provided in the battery management device provided in the aforementioned embodiment. For details of the connection state conversion device provided in this embodiment, please refer to the description in the aforementioned embodiment, which will not be repeated here.

[0066] An embodiment of the present application also provides a battery management system, including a battery management device.

[0067] Among them, the battery management device included in the battery management system can be similar to the battery management device provided in the aforementioned embodiment. For details of the battery management device provided in this embodiment, please refer to the description in the aforementioned embodiment, which will not be repeated here.

[0068] An embodiment of the present application further provides a computer-readable storage medium for storing a computer program, wherein the computer program is used to execute the connection method of the connection conversion device of the various embodiments of the present application described above.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery management device, characterized in that: The battery management device comprises: a battery device and a connection state conversion device; The battery device includes a first battery pack and a second battery pack, and the connection state conversion device includes a first connection component and a second connection component, wherein: The first end of the first connecting component is connected to the positive electrode of the first battery pack, the negative electrode of the first battery pack is connected to the positive electrode of the second battery pack, and the negative electrode of the second battery pack is connected to the second end of the second connecting component; The second end of the first connecting member is respectively connected to the first end of the second connecting member, the negative electrode of the first battery pack, and the positive electrode of the second battery pack; The third end of the first connecting component is connected to the positive electrode of the charging interface, and the third end of the second connecting component is connected to the negative electrode of the charging interface.

2. The battery management device according to claim 1, characterized in that: The first connection component includes a first connection state conversion device and a second connection state conversion device, wherein: The first end of the first connection state conversion device is connected to the positive electrode of the first battery pack as the first end of the first connection component; The second end of the first connection state conversion device is connected to the first end of the second connection state conversion device and the positive electrode of the charging interface as the third end of the first connection component; The second end of the second connection state conversion device serves as the second end of the first connection component and is respectively connected to the first end of the second connection component, the negative electrode of the first battery pack and the positive electrode of the second battery pack.

3. The battery management device according to claim 2, characterized in that: The second connection component includes a third connection state conversion device and a fourth connection state conversion device, wherein: The first end of the third connection state conversion device is connected to the second end of the second connection state conversion device, the negative electrode of the first battery pack and the positive electrode of the second battery pack respectively as the first end of the second connection component; The second end of the third connection state conversion device as the third end of the second connection component is respectively connected to the first end of the fourth connection state conversion device and the negative electrode of the charging interface; The second end of the fourth connection state conversion device serves as the second end of the second connection component and is connected to the negative electrode of the second battery pack.

4. The battery management device according to claim 3, characterized in that: The battery management device further comprises: a control device, wherein: The control device is used to send a control signal to the connection state conversion device according to the nominal voltage of the battery device and the platform voltage of the charging device, and the control signal is used to control the connection state conversion device to be in a corresponding connection state.

5. The battery management device according to claim 4, characterized in that: The control device is used to control the connection state conversion device to be in the first connection state when the nominal voltage of the battery device is higher than the platform voltage of the charging device, so that the charging device charges the first battery pack through the charging interface; The first connection state includes: the first connection state conversion device and the third connection state conversion device are both in the on state, and the second connection state conversion device and the fourth connection state conversion device are both in the off state.

6. The battery management device according to claim 4, characterized in that: The control device is used to control the connection state conversion device to be in the second connection state when the nominal voltage of the battery device is higher than the platform voltage of the charging device, so that the charging device charges the second battery pack through the charging interface; The second connection state includes: the second connection state conversion device and the fourth connection state conversion device are both in the on state, and the first connection state conversion device and the third connection state conversion device are both in the off state.

7. The battery management device according to claim 4, characterized in that: The control device is used to determine a target battery group among the first battery group and the second battery group when the nominal voltage of the battery device is higher than the platform voltage of the charging device, and control the connection state conversion device to be in the first connection state or the second connection state according to the target battery group, so that the charging device charges the target battery group through the charging interface; The target battery group is the battery group with the lowest remaining power among the first battery group and the second battery group, or the target battery group is the battery group without fault among the first battery group and the second battery group.

8. The battery management device according to claim 5, characterized in that: In the case where the nominal voltage of the battery device is higher than the platform voltage of the charging device, the control device is further used for: When the first battery pack reaches a first preset SOC, controlling the connection state conversion device to convert from a first connection state to a second connection state; When the second battery pack reaches a second preset SOC, controlling the connection state conversion device to convert from the second connection state to the first connection state; When the first battery pack reaches a third preset SOC, controlling the connection state conversion device to convert from the first connection state to the second connection state; When the second battery pack reaches a fourth preset SOC, the connection state conversion device is controlled to convert from the second connection state to the first connection state.

9. The battery management device according to claim 4, characterized in that: The battery management device further comprises: a fifth connection state conversion device, wherein: The first end of the fifth connection state conversion device is respectively connected to the negative electrode of the first battery pack and the positive electrode of the second battery pack, and the second end of the fifth connection state conversion device is respectively connected to the second end of the second connection state conversion device and the first end of the third connection state conversion device.

10. The battery management device according to claim 9, characterized in that: The control device is used to control the connection state conversion device to be in a third connection state when the nominal voltage of the battery device is not higher than the platform voltage of the charging device, so that the charging device charges the battery device through the charging interface; The third connection state includes: the first connection state conversion device and the fourth connection state conversion device are both in the on state, and the second connection state conversion device, the third connection state conversion device and the fifth connection state conversion device are all in the off state.

11. The battery management device according to any one of claims 1 to 10, characterized in that: The battery management device further comprises: a sixth connection state conversion device, wherein: The first end of the sixth connection state conversion device is connected to the positive electrode of the first battery pack; The second end of the sixth connection state conversion device is connected to the first end of the high voltage load; The second end of the high-voltage load is connected to the negative electrode of the second battery pack.

12. The battery management device according to any one of claims 1 to 10, characterized in that: The battery management device further comprises: a seventh connection state conversion device, wherein: The first end of the seventh connection state conversion device is connected to the negative electrode of the second battery pack; The second end of the seventh connection state conversion device is connected to the second end of the high voltage load; The first end of the high-voltage load is connected to the positive electrode of the first battery pack.

13. The battery management device according to claim 11, characterized in that: The battery management device further comprises: an eighth connection state conversion device and a pre-charging resistor, wherein: The first end of the eighth connection state conversion device is respectively connected to the positive electrode of the first battery pack and the first end of the sixth connection state conversion device; The second end of the eighth connection state conversion device is connected to the first end of the pre-charging resistor; The second end of the pre-charging resistor is connected to the first end of the high voltage load and the second end of the sixth connection state conversion device respectively.

14. A connection state conversion device, characterized in that: A connection relationship comprising the connection state conversion device according to any one of claims 1 to 13.

15. A battery management system, characterized in that: The invention comprises a battery management device as claimed in any one of claims 1 to 13.

Images