Battery module circuit structure and battery module parallel operation system

Abstract

The utility model is applicable to the technical field of electronic circuits, and provides a battery module circuit structure and a battery module parallel operation system, the battery module circuit structure comprises a plurality of battery modules which are connected in parallel through a CAN bus, each battery module comprises a battery management module, a terminal resistor, a first switch piece and a second switch piece, each battery management module comprises a channel connecting end, an address input end, an address output end and an address communication line, the channel connecting end is used for being connected with a CAN bus, the address input end is connected with the first end of the address communication line, and the first switch piece is connected with the address input end of another battery management module; the first switch piece is used for being connected with an address output end or a second end of an address communication line, a first port of the channel connecting end is connected with one end of the terminal resistor, the other end of the terminal resistor is connected with a second port of the channel connecting end through the second switch piece, and control ends of the first switch piece and the second switch piece are both connected with the battery management module.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic circuits, and in particular relates to a battery module circuit structure and a battery module parallel system. Background Art

[0002] With the rapid development of the new energy industry, the capacity of a single battery management system is far from meeting the application requirements in some occasions, so expanding capacity through parallel connection has become a common choice.

[0003] In the parallel system, it is very important to assign a communication address to each battery group, to summarize the data of each battery group, and to make it intelligent for the convenience of end customers. Each battery group is set with a fixed and unique SN code through the host computer. The SN code is the serial number, which is the product's ID number, also known as the machine code, authentication code, registration application code, etc. Each device only corresponds to one set of product serial numbers. The SN code is used to assign addresses and summarize data through the CAN (Controller Area Network) bus.

[0004] However, in the existing parallel system, each battery group will send its own SN code to the CAN bus and also receive the SN codes sent by other batteries. The aggregated SN codes are processed through some logic to assign addresses to each battery module. The implementation logic is complex and the software programming is difficult. Moreover, the assigned addresses do not correspond one-to-one to the physical space of the powered batteries, so the communication address of the battery group cannot be determined by the physical space of the batteries. Utility Model Content

[0005] The utility model provides a battery module circuit structure, aiming to solve the problem that the existing battery parallel system has complex implementation logic and cannot determine the communication address of the battery pack through the physical space of the battery.

[0006] The embodiment of the utility model is implemented as follows: a battery module circuit structure includes a plurality of battery modules connected in parallel via a CAN bus, the battery module including a battery management module, a terminal resistor, a first switch element and a second switch element;

[0007] The battery management module includes a channel connection terminal, an address input terminal, an address output terminal and an address communication line, the channel connection terminal is used to connect to the CAN bus, the address input terminal is connected to the first end of the address communication line, the first switch element is connected to the address input terminal of another battery management module, and the first switch element is used to connect to the address output terminal or the second end of the address communication line;

[0008] The first port of the channel connection end is connected to one end of the terminal resistor, and the other end of the terminal resistor is connected to the second port of the channel connection end through the second switch element;

[0009] The control ends of the first switch element and the second switch element are both connected to the battery management module.

[0010] Furthermore, the battery management module includes an RS485 chip.

[0011] Furthermore, the first switch element is a double-throw switch.

[0012] Furthermore, the second switch element includes any one of a triode, a MOS tube, an IGBT and a relay.

[0013] In a second aspect, the present application also provides a battery module parallel system, including the battery module circuit structure as described above.

[0014] The beneficial effect of the present application lies in that the battery module circuit structure of the present application includes a plurality of battery modules, and the plurality of battery modules are connected in parallel through a CAN bus. The battery module includes a battery management module, a terminal resistor, a first switch element and a second switch element, wherein the battery management module includes a channel connection end, an address input end, an address output end and an address communication line, the channel connection end is used to connect to the CAN bus, the address input end is connected to the first end of the address communication line, the first switch element is connected to the address input end of another battery management module, the first switch element is used to connect to the address output end or the second end of the address communication line, the first port of the channel connection end is connected to one end of the terminal resistor, the other end of the terminal resistor is connected to the second port of the channel connection end through the second switch element, and the control ends of the first switch element and the second switch element are both connected to the battery management module. Through the above settings, the battery modules are connected hand in hand through the address communication line. At the same time, the battery management module can control the status of the first switch and the second switch to achieve the connection and parallelization or removal of the battery module, and automatically and dynamically assign addresses. The CAN bus is used to summarize data and send some broadcast commands, which greatly reduces the difficulty of software programming. The assigned address corresponds one-to-one to the physical space address of the powered-on battery. The address and status information of each group of battery modules can be easily obtained, which is convenient for maintenance and troubleshooting. In addition, the terminal resistance is automatically turned on and off according to the assigned address, without the need for manual external resistance, which improves the scalability of the system and the convenience of use by end customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a default state or a dormant state of an embodiment of a battery module circuit structure provided by the present application;

[0016] Figure 2 This is a schematic diagram of parallel connection of battery modules in one embodiment of the battery module circuit structure provided by the present application;

[0017] Figure 3It is a schematic diagram of a main unit or the last group of battery modules in a working state according to an embodiment of the battery module circuit structure provided by the present application;

[0018] Figure 4 This is a schematic diagram of a battery module in a working state in a non-last group of battery modules of an embodiment of the battery module circuit structure provided by the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. In addition, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0020] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0025] The battery module circuit structure of the present application includes a plurality of battery modules, and the plurality of battery modules are connected in parallel via a CAN bus. The battery module includes a battery management module, a terminal resistor, a first switch element and a second switch element, wherein the battery management module includes a channel connection end, an address input end, an address output end and an address communication line, the channel connection end is used to connect to the CAN bus, the address input end is connected to the first end of the address communication line, the first switch element is connected to the address input end of another battery management module, the first switch element is used to connect to the address output end or the second end of the address communication line, the first port of the channel connection end is connected to one end of the terminal resistor, the other end of the terminal resistor is connected to the second port of the channel connection end via the second switch element, and the control ends of the first switch element and the second switch element are both connected to the battery management module. Through the above settings, the battery modules are connected hand in hand through the address communication line. At the same time, the battery management module can control the status of the first switch and the second switch to achieve the connection and parallelization or removal of the battery module, and automatically and dynamically assign addresses. The CAN bus is used to summarize data and send some broadcast commands, which greatly reduces the difficulty of software programming. The assigned address corresponds one-to-one to the physical space address of the powered-on battery. The address and status information of each group of battery modules can be easily obtained, which is convenient for maintenance and troubleshooting. In addition, the terminal resistance is automatically turned on and off according to the assigned address, without the need for manual external resistance, which improves the scalability of the system and the convenience of use by end customers.

[0026] Embodiment 1

[0027] like Figures 1 to 4 As shown, an embodiment of the present application provides a battery module circuit structure, including a plurality of battery modules connected in parallel via a CAN bus, the battery module including a battery management module, a terminal resistor, a first switch element and a second switch element;

[0028] The battery management module includes a channel connection terminal, an address input terminal, an address output terminal and an address communication line, the channel connection terminal is used to connect to the CAN bus, the address input terminal is connected to the first end of the address communication line, the first switch element is connected to the address input terminal of another battery management module, and the first switch element is used to connect to the address output terminal or the second end of the address communication line;

[0029] The first port of the channel connection end is connected to one end of the terminal resistor, and the other end of the terminal resistor is connected to the second port of the channel connection end through the second switch element;

[0030] The control ends of the first switch element and the second switch element are both connected to the battery management module.

[0031] During implementation, the battery module circuit structure provided by the present application is composed of a plurality of battery modules, and the plurality of battery modules are connected in parallel via a CAN bus, and each group of battery modules includes a battery management module, a terminal resistor, a first switch element, and a second switch element.

[0032] The battery management module includes a controller, which may be an MCU, RS485 or other control chip without limitation.

[0033] like Figure 1 and Figure 2 As shown, the battery management module has CAN_TX, CAN_RX, TX1, RX1, TX2 and RX2, wherein CAN_TX and CAN_RX are used to send and receive CAN bus signals, and CAN_H and CAN_L are connected to the CAN bus. in End and A in The battery management module has a D1 terminal, a D2 terminal, and an A terminal, which is used to receive the connection information sent by the previous battery management module, the connection information includes the communication address of the previous battery management module, and send a response message to the previous battery management module. out End and B out The D1 terminal and the D2 terminal are connected to the A terminal through the first switch K11. out End and B out End connection, A out The A terminal of the next battery management module in End connection, B out The B terminal of the next battery management module inThe terminal is connected to send connection information to the next battery management module, the connection information includes the communication address of the battery management module, and receives the response information sent by the next battery management module. in The first end of the first address communication line is connected to the first end of the first address communication line. in The end is connected to the first end of the second address communication line. Figure 1 As shown, the first switch element K11 includes a first switch K31 and a second switch K32. One end of the first switch K31 is connected to A out End, A out The A terminal of the next battery management module in The other end of the first switch K31 is used to connect to the second end of the second address communication line or the D1 end; one end of the second switch K32 is connected to B out End, B out The B terminal of the next battery management module in The other end of the second switch K32 is connected to the second end of the first address communication line or the D2 end.

[0034] In one battery module group, the address input end of the battery management module is connected to the first switch element of the battery management module of another battery module group, that is, the first switch element in the battery management module of this battery module is connected to the address input end of the battery management module of another battery module group.

[0035] For example, taking two battery modules as an example, the first battery module is 100, and the second battery module is 200, wherein the first battery module 100 includes a battery management module 110, a terminal resistor R11, a first switch K11, and a second switch K12, and the second battery module 200 includes a battery management module 210, a terminal resistor R21, a first switch K21, and a second switch K22, and the connection structure is as follows: Figure 2 As shown, no further elaboration is given.

[0036] It should be noted that the above two groups of battery modules are examples of the embodiments of the present application, rather than specific limitations of the present application. In other embodiments, the battery module circuit structure provided by the present application can be composed of N groups of battery modules, N is greater than or equal to 2, for example, N can be 3, 4, 7, 10, 16 or 20, etc., without limitation. Among them, the first battery module and the second battery module are connected hand in hand, the second battery module and the third battery module are connected hand in hand, until the N-1th battery module and the Nth battery module are connected hand in hand, and the CAN buses are all connected together.

[0037] In implementation, taking the first battery module 100 as an example, at the initial moment of system power-on, the interface connection state of the battery module is as follows by default: Figure 1As shown, the communication address of each battery module group is set to 0 by default, and the terminal resistor is disconnected by default; after initialization is completed, the communication line of the battery management module is switched to the transceiver communication line associated with TX2 and RX2.

[0038] Output port of each battery module (A out End, B out end) are all in the cycle to the next battery module input port (A in End, B in The output port sends connection information, which contains the communication address of the local device. If the output port does not receive the response information of the next battery module, it means that the next battery module does not exist and this battery module is the last one. Turn on the terminal resistance of this battery module. The connection status is as follows: Figure 3 shown.

[0039] Within a certain period of time, which is 6 to 10 seconds, such as 7 seconds, 8 seconds or 9 seconds, if the input port of a battery module does not receive the output interface information of the previous battery, it means that the first battery module of this battery module, that is, this battery module is the host, sets the address to 0, turns on the terminal resistance, and the connection status is as follows: Figure 3 If the input port of a battery module group receives the connection information of the previous battery module group, it means that the battery module is a slave, and the address information in the connection information is read out and added by 1, and then assigned to the communication address of the battery module, and the communication address information of the battery module is sent to the next battery module group through the output port. The address is incremented one by one from one battery module group to another. If the next battery module group has a response signal, it means that the battery module is not the last slave, and the terminal resistor is disconnected. Taking the first battery module 100 as an example, the connection status is as follows: Figure 4 shown.

[0040] Each battery module sends its own battery status information through the CAN bus. The sending ID contains the address information. After receiving this information, the host can determine which slave device sent the data based on the content of the ID, summarize the data, and perform some logic-related strategy processing, which will not be elaborated here.

[0041] If a battery module is dormant for some reason, the second switch is disconnected to disconnect the terminal resistor, and the first switch is used to disconnect the A out End and A in End connection, B out End and B inThe battery module is kicked out of the entire system, and the system will automatically reassign the communication address without any manual intervention. For example, taking the first battery module 100 as an example, when the first battery module 100 is dormant, the second switch K12 is disconnected to disconnect the terminal resistor R11, and the first switch K31 is used to disconnect the A out The second end of the second address communication line is connected to the second end of the second address communication line, which is equivalent to A out End and A in At the same time, the second switch K32 connects B out The second end of the first address communication line is connected to the end of B out End and B in The connection status is as follows: Figure 1 As shown, the first battery module 100 is kicked out of the entire system, and the system automatically reallocates the communication address.

[0042] The battery module circuit structure of the present application includes a plurality of battery modules, and the plurality of battery modules are connected in parallel via a CAN bus. The battery module includes a battery management module, a terminal resistor, a first switch element and a second switch element, wherein the battery management module includes a channel connection end, an address input end, an address output end and an address communication line, the channel connection end is used to connect to the CAN bus, the address input end is connected to the first end of the address communication line, the first switch element is connected to the address input end of another battery management module, the first switch element is used to connect to the address output end or the second end of the address communication line, the first port of the channel connection end is connected to one end of the terminal resistor, the other end of the terminal resistor is connected to the second port of the channel connection end via the second switch element, and the control ends of the first switch element and the second switch element are both connected to the battery management module. Through the above settings, the battery modules are connected hand in hand through the address communication line. At the same time, the battery management module can control the status of the first switch and the second switch to achieve the connection and parallelization or removal of the battery module, and automatically and dynamically assign addresses. The CAN bus is used to summarize data and send some broadcast commands, which greatly reduces the difficulty of software programming. The assigned address corresponds one-to-one to the physical space address of the powered-on battery. The address and status information of each group of battery modules can be easily obtained, which is convenient for maintenance and troubleshooting. In addition, the terminal resistance is automatically turned on and off according to the assigned address, without the need for manual external resistance, which improves the scalability of the system and the convenience of use by end customers.

[0043] In some embodiments, the first switch element is a double-throw switch.

[0044] In implementation, the first switch element may be a double-pole double-throw switch. Of course, the first switch element may also include two single-pole double-throw switches. For example, taking a single-pole double-throw switch as an example, the single-pole double-throw switch is composed of a moving end and a fixed end, and the moving end is the so-called "pole". Figure 1 As shown in the example, the first single-pole double-throw switch is K31, and the fixed end of the first single-pole double-throw switch is connected to A out The moving end of the first single-pole double-throw switch can be connected to D1 or the second end of the second address communication line under the control of the battery management module. Similarly, the second single-pole double-throw switch is K32, and the fixed end of the second single-pole double-throw switch is connected to B out The moving end of the second single-pole double-throw switch can be connected to D2 or to the second end of the first address communication line under the control of the battery management module.

[0045] In some optional embodiments, the second switch element includes any one of a transistor, a MOS tube, an IGBT and a relay. The second switch element can disconnect or connect the terminal resistor to the system under the control of the battery management module. In some other embodiments, the second switch element can also use other devices with switching functions without limitation.

[0046] Embodiment 2

[0047] In some optional embodiments, the present application also provides a battery module parallel system, including the battery module circuit structure as described above.

[0048] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the structure and implementation principle of the battery module parallel system described above can refer to the corresponding structure and implementation principle in the aforementioned embodiment 1, and will not be repeated here.

[0049] The battery module circuit structure of the present application includes a plurality of battery modules, and the plurality of battery modules are connected in parallel via a CAN bus. The battery module includes a battery management module, a terminal resistor, a first switch element and a second switch element, wherein the battery management module includes a channel connection end, an address input end, an address output end and an address communication line, the channel connection end is used to connect to the CAN bus, the address input end is connected to the first end of the address communication line, the first switch element is connected to the address input end of another battery management module, the first switch element is used to connect to the address output end or the second end of the address communication line, the first port of the channel connection end is connected to one end of the terminal resistor, the other end of the terminal resistor is connected to the second port of the channel connection end via the second switch element, and the control ends of the first switch element and the second switch element are both connected to the battery management module. Through the above settings, the battery modules are connected hand in hand through the address communication line. At the same time, the battery management module can control the status of the first switch and the second switch to achieve the connection and parallelization or removal of the battery module, and automatically and dynamically assign addresses. The CAN bus is used to summarize data and send some broadcast commands, which greatly reduces the difficulty of software programming. The assigned address corresponds one-to-one to the physical space address of the powered-on battery. The address and status information of each group of battery modules can be easily obtained, which is convenient for maintenance and troubleshooting. In addition, the terminal resistance is automatically turned on and off according to the assigned address, without the need for manual external resistance, which improves the scalability of the system and the convenience of use by end customers.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery module circuit structure, characterized in that: It includes a plurality of battery modules connected in parallel via a CAN bus, wherein the battery module includes a battery management module, a terminal resistor, a first switch element and a second switch element; The battery management module comprises a channel connection terminal, an address input terminal, an address output terminal and an address communication line, wherein the channel connection terminal is used to connect to the CAN bus, the address input terminal is connected to the first end of the address communication line, the first switch element is connected to the address input terminal of another battery management module, and the first switch element is used to connect to the address output terminal or the second end of the address communication line; The first port of the channel connection end is connected to one end of the terminal resistor, and the other end of the terminal resistor is connected to the second port of the channel connection end through the second switch element; The control ends of the first switch element and the second switch element are both connected to the battery management module.

2. The battery module circuit structure according to claim 1, characterized in that: The battery management module includes an RS485 chip.

3. The battery module circuit structure according to claim 1, characterized in that: The first switch element is a double-throw switch.

4. The battery module circuit structure according to any one of claims 1 to 3, characterized in that: The second switch element includes any one of a triode, a MOS tube, an IGBT and a relay.

5. A battery module parallel system, characterized in that: Comprising a battery module circuit structure as described in any one of claims 1 to 4.

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