Battery management system, battery device and electric device

Abstract

The utility model discloses a battery management system, a battery device and a power utilization device. The battery management system comprises a first sampling module, a second sampling module, a first communication module, a second communication module, a third communication module and a controller, wherein the first sampling module is electrically connected with the controller through the first communication module; the second sampling module is electrically connected with the controller through the second communication module; the first sampling module and the second sampling module can be selectively communicated through the third communication module. According to the embodiment of the invention, the communication reliability between the sampling module and the controller can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery management, and in particular to a battery management system, a battery device and an electrical device. Background Art

[0002] During the driving process of the vehicle, it is particularly important to sample the battery cells and high voltage, which is an important part of ensuring the safe operation of the battery. The Battery Management System (BMS) uses different sampling modules to collect different operating parameters of the power battery or to balance the power battery. These sampling modules need to communicate with the BMS controller. How to improve the communication reliability between the sampling module and the controller has become an important issue faced by technicians in this field. Utility Model Content

[0003] The present application provides a battery management system, a battery device and an electrical device, which can improve the communication reliability between a sampling module and a controller.

[0004] In a first aspect, the present application provides a battery management system, comprising: a first sampling module, a second sampling module, a first communication module, a second communication module, a third communication module and a controller: the first sampling module is electrically connected to the controller through the first communication module; the second sampling module is electrically connected to the controller through the second communication module; the first sampling module and the second sampling module can be selectively connected through the third communication module.

[0005] According to the battery management system provided by the embodiment of the present application, the first communication module is connected between the first sampling module and the controller, the second communication module is connected between the second sampling module and the controller, the third communication module is connected between the first sampling module and the second sampling module, and the first sampling module and the second sampling module can be selectively connected, so that in the event of a problem in any one of the first communication module and the second communication module, the two sampling modules and the controller can still communicate, thereby improving the communication reliability between the sampling modules and the controller. In addition, compared with the solution of setting two communication modules between each sampling module and the controller, the embodiment of the present application can achieve redundant communication functions while reducing costs.

[0006] In a possible implementation of the first aspect, the third communication module includes a switch device, and the first sampling module is electrically connected to the second sampling module through the switch device. In this example, by setting the switch device between the first sampling module and the second sampling module, by controlling the state of the switch device, it can be realized whether the first sampling module and the second sampling module can be connected.

[0007] In a possible implementation of the first aspect, the controller is configured to: control the voltage of the connection pin between the first sampling module and the second sampling module to control whether the first sampling module and the second sampling module are connected. In this example, by controlling the voltage of the connection pin by the controller, whether the first sampling module and the second sampling module can be connected can be achieved, and there is no need to set a switch device, which can reduce costs.

[0008] In a possible implementation of the first aspect, the first sampling module is configured to: control the voltage of the connecting pin between itself and the second sampling module to control whether the first sampling module and the second sampling module are connected; and / or the second sampling module is configured to: control the voltage of the connecting pin between itself and the first sampling module to control whether the first sampling module and the second sampling module are connected. In this example, by controlling the voltage of the connecting pin of the sampling module itself, it is possible to realize whether the first sampling module and the second sampling module can be connected, and there is no need to set a switch device, which can reduce costs.

[0009] In a possible implementation of the first aspect, the first communication module includes a first communication component and a first interface chip, the first sampling module is electrically connected to the first interface chip via the first communication component, and the first interface chip is electrically connected to the controller. In this example, by providing the first communication component and the first interface chip, communication between the first sampling module and the controller can be achieved.

[0010] In a possible implementation manner of the first aspect, the first communication element includes a first daisy chain. The daisy chain communication between the first sampling module and the first interface chip can reduce costs and ensure transmission efficiency.

[0011] In a possible implementation of the first aspect, the number of the first daisy chains is at least 2. In this way, when some of the first daisy chains have problems, other first daisy chains can be used for communication, thereby further improving the reliability of communication.

[0012] In a possible implementation of the first aspect, the second sampling module and the controller are arranged on different circuit boards; the second communication module includes a second communication component and a second interface chip, the second sampling module is electrically connected to the second interface chip via the second communication component, and the second interface chip is electrically connected to the controller. In this embodiment, when the second sampling module is a high-voltage sampling module, the second sampling module and the controller are arranged on different circuit boards, which can better isolate the high and low voltage components to ensure reliability.

[0013] In a possible implementation manner of the first aspect, the second communication component includes a second daisy chain. The second sampling module and the second interface chip communicate through a daisy chain, which can reduce costs and ensure transmission efficiency.

[0014] In a possible implementation of the first aspect, the second sampling module and the controller are arranged on the same circuit board; the second communication module includes a third communication component, the second sampling module is electrically connected to the controller through the third communication component, and the third communication component is configured to achieve isolated communication between the second sampling module and the controller. In this example, the second sampling module and the controller are arranged on the same circuit board, which can reduce the number of circuit boards and reduce costs, and the third communication component can perform isolated communication, thereby ensuring reliability.

[0015] In a possible implementation manner of the first aspect, the third communication component includes an isolated serial peripheral interface SPI.

[0016] In a possible implementation of the first aspect, the first sampling module includes a plurality of first sampling chips, the plurality of first sampling chips communicate in series, and the first and last first sampling chips are each electrically connected to the controller via a first communication component. In this way, bidirectional communication can be achieved on the communication link, and when a first sampling chip fails, the other first sampling chips can still achieve communication with the controller.

[0017] In a possible implementation of the first aspect, the first sampling module is configured to implement at least one of the following: collecting voltages of single cells in the battery, collecting temperatures, and performing balancing control;

[0018] The second sampling module is configured to implement at least one of the following: sampling the current on the busbar connected to the battery, sampling the voltage inside and / or outside the positive relay connected to the battery, and sampling the insulation resistance.

[0019] When the first sampling module, the second sampling module and the controller can communicate reliably, the controller can timely obtain the above information collected by the first sampling module and the second sampling module, thereby ensuring that the battery operates safely and stably.

[0020] Based on the same technical concept, in a second aspect, an embodiment of the present application provides a battery device, comprising a battery management system as described in any embodiment of the first aspect.

[0021] Based on the same technical concept, in a third aspect, an embodiment of the present application provides an electrical device, comprising a battery device as described in any embodiment of the second aspect.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of a battery management system according to an embodiment of the present application;

[0025] Figure 2 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0026] Figure 3 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0027] Figure 4 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0028] Figure 5 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0029] Figure 6 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0030] Figure 7 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0031] Figure 8 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0032] Fig. 9 This is a schematic structural diagram of a battery device according to an embodiment of the present application;

[0033] Fig.10 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] 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 and completely 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.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of 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 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 drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "electrical connection", "connection", and "attachment" 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 direct connection, or an indirect connection 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.

[0037] If the sampling module and the controller in the battery management system cannot communicate reliably, the controller cannot obtain the operating parameters of the battery, resulting in failure to ensure that the battery can operate safely or maintain good performance. Therefore, it is crucial to improve the communication reliability between the sampling module and the controller.

[0038] The embodiments of the present application provide a battery management system, a battery device and an electrical device. The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0039] Figure 1 FIG. 1 is a schematic diagram of a battery management system according to an embodiment of the present application. Figure 1 As shown, the battery management system provided in the embodiment of the present application includes a first sampling module 10 , a second sampling module 20 , a first communication module 30 , a second communication module 40 , a third communication module 50 and a controller 60 .

[0040] The first sampling module 10 is electrically connected to the controller 60 via the first communication module 30 ; the second sampling module 20 is electrically connected to the controller 60 via the second communication module 40 ; the first sampling module 10 and the second sampling module 20 can be selectively connected via the third communication module 50 .

[0041] The first sampling module 10 and the second sampling module 20 can collect signals. Exemplarily, the first sampling module 10 and the second sampling module 20 are used to collect different parameters.

[0042] The first communication module 30 is used to realize communication between the first sampling module 10 and the controller 60. For example, the first communication module 30 can transmit the signal collected by the first sampling module 10 to the controller 60, and can also transmit the control signal sent by the controller 60 to the first sampling module 10.

[0043] The second communication module 40 is used to realize communication between the second sampling module 20 and the controller 60. For example, the second communication module 40 can transmit the signal collected by the second sampling module 20 to the controller 60, and can also transmit the control signal sent by the controller 60 to the second sampling module 20.

[0044] The third communication module 50 can realize the communication between the first sampling module 10 and the second sampling module 20. For example, the signal collected by the first sampling module 10 can be transmitted to the second sampling module 20 through the third communication module 50, and transmitted to the controller 60 through the second communication module 40; the control signal sent by the controller 60 to the first acquisition module 10 can be transmitted to the second sampling module 20 through the second communication module 40, and transmitted to the first sampling module 10 through the third communication module 50. For another example, the signal collected by the second sampling module 20 can be transmitted to the first sampling module 10 through the third communication module 50, and transmitted to the controller 60 through the first communication module 30; the control signal sent by the controller 60 to the second acquisition module 20 can be transmitted to the first sampling module 10 through the first communication module 30, and transmitted to the second sampling module 20 through the third communication module 50.

[0045] In the embodiment of the present application, the first sampling module 10 and the second sampling module 20 can be selectively connected through the third communication module 50, which may include the following examples:

[0046] As an example, when a problem occurs in the first communication module 30, the first sampling module 10 and the second sampling module 20 can communicate with each other through the third communication module 50; in this case, the first sampling module 10 no longer communicates with the controller 60 through the first communication module 30, but communicates with the controller 60 through the third communication module 50, the second communication module 40, and the controller 60. In this case, the second sampling module 20 still communicates with the controller 60 through the second communication module 40.

[0047] As another example, when a problem occurs in the second communication module 40, the first sampling module 10 and the second sampling module 20 can communicate with each other through the third communication module 50; in this case, the second sampling module 20 no longer communicates with the controller 60 through the second communication module 40, but communicates with the controller 60 through the third communication module 50, the first communication module 30, and the controller 60. In this case, the first sampling module 10 still communicates with the controller 60 through the first communication module 30.

[0048] As another example, when there are no problems with the first communication module 30 and the second communication module 40, the connection between the first sampling module 10 and the second sampling module 20 is disconnected; in this case, the first sampling module 10 still communicates with the controller 60 through the first communication module 30, and the second sampling module 20 still communicates with the controller 60 through the second communication module 40.

[0049] According to the battery management system provided by the embodiment of the present application, the first communication module is connected between the first sampling module and the controller, the second communication module is connected between the second sampling module and the controller, the third communication module is connected between the first sampling module and the second sampling module, and the first sampling module and the second sampling module can be selectively connected, so that in the event of a problem in any one of the first communication module and the second communication module, the two sampling modules and the controller can still communicate, thereby improving the communication reliability between the sampling modules and the controller. In addition, compared with the solution of setting two communication modules between each sampling module and the controller, the embodiment of the present application can achieve redundant communication functions while reducing costs.

[0050] In some embodiments, the first sampling module 10 is configured to implement at least one of the following: collecting voltages of single cells in the battery, collecting temperatures, and performing balancing control.

[0051] The second sampling module 20 is configured to implement at least one of the following: sampling the current on the busbar connected to the battery, sampling the voltage inside and / or outside the relay connected to the battery, and sampling the insulation resistance.

[0052] The first sampling module 10 may be referred to as a cell voltage sampling module. Exemplarily, the first sampling module 10 includes an analog front-end (AFE) chip, which can perform balanced temperature detection, balanced control, single cell temperature detection, single cell voltage detection, and the like.

[0053] The second sampling module 20 can be called a high-voltage sampling module. The positive and negative electrodes of the battery are connected to the positive bus and the negative bus, respectively. The positive bus is provided with a main positive relay, and the negative bus is provided with a main negative relay. The second sampling module 20 can sample the current on the positive bus and / or the negative bus, the voltage inside and outside the main positive relay and / or the main negative relay, and the insulation resistance of the positive and negative electrodes of the battery relative to the reference ground, etc.

[0054] Exemplarily, the controller 60 includes a microcontroller unit (MCU). The controller 60 may be disposed on a main control circuit board, and the controller may also be referred to as a main control MCU.

[0055] When the first sampling module 10 , the second sampling module 20 and the controller 60 can communicate reliably, the controller 60 can timely obtain the above information collected by the first sampling module 10 and the second sampling module 20 , thereby ensuring that the battery operates safely and stably.

[0056] Some implementations of selectively communicating the first sampling module with the second sampling module via the third communication module are exemplarily introduced below.

[0057] Figure 2 FIG. 1 is a schematic diagram of a battery management system according to another embodiment of the present application. Figure 2 As shown, the third communication module 30 includes a switch device K1 , and the first sampling module 10 and the second sampling module 20 are electrically connected via the switch device K1 .

[0058] When the switch device K1 is in a closed state, the first sampling module 10 is connected to the second sampling module 20 ; when the switch device K1 is in an open state, the first sampling module 10 is disconnected from the second sampling module 20 .

[0059] Exemplarily, the state of the switch device K1 can be controlled by the controller 60. For example, the controller 60 is configured to: when any one of the first communication module 30 and the second communication module 40 has a problem, control the switch device K1 to be closed; when neither the first communication module 30 nor the second communication module 40 has a problem, control the switch device K1 to be disconnected.

[0060] For example, when problems occur in both the first communication module 30 and the second communication module 40 , the controller 60 may also be used to control the switch device K1 to be disconnected.

[0061] Exemplarily, the switch device K1 may be connected to the first sampling module 10 and the second sampling module 20 via a daisy chain.

[0062] In some other embodiments, the controller is configured to: control the voltage of the connection pin between the first sampling module and the second sampling module to control whether the first sampling module and the second sampling module are connected.

[0063] For example, Figure 3 As shown, the first pin 11 of the first sampling module 10 and the second pin 22 of the second sampling module 20 are connected through the third communication module 50. The first pin 11 and the second pin 22 are connection pins between the first sampling module 10 and the second sampling module 20. For example, the controller 60 is configured to: control the voltage of at least one of the first pin 11 and the second pin 22 to control whether the first sampling module and the second sampling module are connected.

[0064] Specifically, the voltage of the connection pin can be controlled according to the specific configuration of the sampling module. For example, when the voltage of the first pin 11 and / or the second pin 22 is a high voltage, the connection between the first sampling module 10 and the second sampling module 20 can be disconnected, and the controller can control the voltage of the first pin 11 and / or the second pin 22 to be a high voltage. For another example, when the voltage of the first pin 11 and / or the second pin 22 is a low voltage, the connection between the first sampling module 10 and the second sampling module 20 can be made, and the controller can control the voltage of the first pin 11 and the second pin 22 to be a low voltage. It should be noted that the corresponding relationship between the pin voltage and whether the sampling module is connected in this example is only an example and is not used to limit the present application.

[0065] Exemplarily, when the controller controls whether the sampling modules are connected by controlling the voltage of the connection pins of the sampling modules, the third communication module 50 may not include a switch device. For example, the third communication module 50 includes a daisy chain.

[0066] In some further embodiments, the first sampling module is configured to: control the voltage of its own connection pin with the second sampling module to control whether the first sampling module is connected with the second sampling module;

[0067] And / or, the second sampling module is configured to: control the voltage of its own connecting pin with the first sampling module to control whether the first sampling module is connected to the second sampling module.

[0068] Still Figure 3 For example, the first pin 11 and the second pin 22 are connection pins between the first sampling module 10 and the second sampling module 20. For example, the first sampling module 10 is configured to: control the voltage of the first pin 11 to control whether the first sampling module and the second sampling module are connected; and / or, the second sampling module 20 is configured to: control the voltage of the second pin 22 to control whether the first sampling module and the second sampling module are connected.

[0069] Specifically, the voltage of the connection pin is also controlled here according to the specific configuration of the sampling module. Still taking the case where the voltage of the first pin 11 and / or the second pin 22 is a high voltage, the connection between the first sampling module 10 and the second sampling module 20 can be disconnected as an example, the first sampling module 10 can control the voltage of the first pin 11 to be a high voltage, and / or the second sampling module 20 controls the voltage of the second pin 22 to be a high voltage, so as to disconnect the connection between the first sampling module 10 and the second sampling module 20. Still taking the case where the voltage of the first pin 11 and / or the second pin 22 is a low voltage, the connection between the first sampling module 10 and the second sampling module 20 can be made as an example, the first sampling module 10 controls the voltage of the first pin 11 to be a low voltage, and the second sampling module 20 controls the voltage of the second pin 22 to be a low voltage, so as to make the connection between the first sampling module 10 and the second sampling module 20. It should be noted that the corresponding relationship between the pin voltage and whether the sampling modules are connected in this example is only an example and is not used to limit the present application.

[0070] For example, when the sampling modules control whether the sampling modules are connected by controlling the voltage of their own connection pins, the third communication module 50 may not include a switch device. For example, the third communication module 50 includes a daisy chain.

[0071] Some examples of selective communication between the first sampling module and the second sampling module are introduced above, but this is not intended to limit the present application.

[0072] Figure 4 FIG. 1 is a schematic diagram of a battery management system according to another embodiment of the present application. Figure 4 As shown, the first communication module 30 includes a first communication component 31 and a first interface chip 32 . The first sampling module 10 is electrically connected to the first interface chip 32 via the first communication component 31 , and the first interface chip 32 is electrically connected to the controller 60 .

[0073] Exemplarily, when a problem occurs in at least one of the first communication component 31 and the first interface chip 32 , it can be considered that a problem occurs in the first communication module 30 .

[0074] The first communication component 31 can realize the communication between the first sampling module 10 and the first interface chip 32. The first interface chip 32 can parse the data. For example, the first interface chip 32 parses the signal from the first communication component 31 into a signal that can be recognized by the controller 60, and transmits it to the controller 60. For another example, the first interface chip 32 parses the signal from the controller 60 into a signal that can be recognized by the first communication component 31, and transmits it to the first sampling module 10 via the first communication component 31.

[0075] Exemplarily, the first interface chip 32 and the controller 60 may be disposed on the same main control circuit board 70 .

[0076] In some embodiments, Figure 4 As shown, the first communication element 31 includes a first daisy chain 311. In this example, the first sampling module 10 and the first interface chip 32 communicate via a daisy chain. The daisy chain communication method has the characteristics of low cost and high transmission efficiency. The daisy chain communication between the first sampling module and the first interface chip can reduce costs and ensure transmission efficiency.

[0077] In some embodiments, Figure 4 As shown, the number of the first daisy chains 311 includes at least 2. When the number of the first daisy chains 311 includes a plurality, when some of the first daisy chains have problems, other first daisy chains can be used for communication, thereby further improving the reliability of communication.

[0078] Of course, the first communication component 31 may also be other communication components besides the daisy chain, for example, it may also be designed as UART communication, CAN communication, etc. according to actual conditions.

[0079] Figure 5 FIG. 1 is a schematic diagram of a battery management system according to another embodiment of the present application. Figure 5 As shown, the second sampling module 20 and the controller 60 are arranged on different circuit boards; the second communication module 40 includes a second communication component 41 and a second interface chip 42, the second sampling module 20 is electrically connected to the second interface chip 42 via the second communication component 41, and the second interface chip 42 is electrically connected to the controller 60. In the embodiment of the present application, when the second sampling module is a high-voltage sampling module, the second sampling module and the controller are arranged on different circuit boards, which can better isolate the high and low voltage components to ensure reliability.

[0080] For example, when at least one of the second communication component 41 and the second interface chip 42 has a problem, it can be considered that the second communication module 40 has a problem.

[0081] The second communication element 42 can realize the communication between the second sampling module 20 and the second interface chip 42. The second interface chip 42 can parse the data. For example, the second interface chip 42 parses the signal from the second communication element 41 into a signal that can be recognized by the controller 60, and transmits it to the controller 60. For another example, the second interface chip 42 parses the signal from the controller 60 into a signal that can be recognized by the second communication element 41, and transmits it to the second sampling module 20 via the second communication element 41.

[0082] Exemplarily, the second interface chip 42 and the controller 60 may be disposed on the same main control circuit board 70 . The second sampling module 20 is disposed outside the main control circuit board 70 .

[0083] In some embodiments, Figure 5 As shown, the second communication element 41 includes a second daisy chain 411. The daisy chain communication mode has the characteristics of low cost and high transmission efficiency. The sampling daisy chain communication between the second sampling module and the second interface chip can reduce costs and ensure transmission efficiency.

[0084] Of course, in other examples, the second communication component 41 may also be other communication components other than the daisy chain, for example, it may also be designed as UART communication, CAN communication, etc. according to actual conditions.

[0085] Figure 6 FIG. 1 is a schematic diagram of a battery management system according to another embodiment of the present application. In other embodiments, Figure 6 As shown, the second sampling module 10 and the controller 60 can also be arranged on the same circuit board; the second communication module 40 includes a third communication component 43, and the second sampling module 20 is electrically connected to the controller 60 through the third communication component 43, and the third communication component 43 is configured to achieve isolated communication between the second sampling module 20 and the controller 60. In the embodiment of the present application, the second sampling module and the controller are arranged on the same circuit board, which can reduce the number of circuit boards and reduce costs, and the third communication component can perform isolated communication, thereby ensuring reliability.

[0086] The second sampling module 20 is connected to the high voltage ground GND1, the controller 60 is connected to the low voltage ground GND2, and the third communication component 43 isolates the second sampling module 20 and the controller 60 from high and low voltages, and the third communication component 43 can realize communication between the second sampling module 20 and the controller 60.

[0087] As an example, the third communication means includes an isolated serial peripheral interface SPI.

[0088] As an example, Figure 6 As shown, the third communication module 50 and the first communication element 31 both include a daisy chain, and there may be no connection between the daisy chain of the third communication module 50 and the daisy chain of the first communication element 31 .

[0089] As another example, Figure 7As shown, the third communication module 50 and the first communication element 31 both include a daisy chain, and the daisy chain of the third communication module 50 is connected to one of the daisy chains of the first communication element 31. In this case, if a problem occurs in the second communication module 40, the second sampling module 20 and the controller 60 can communicate through the third communication module 50, one of the daisy chains of the first communication element 31, and the first interface chip 32, that is, the communication signal may not pass through the first sampling module 10.

[0090] Figure 8 FIG. 1 is a schematic diagram of a battery management system according to another embodiment of the present application. Figure 8 As shown, the first sampling module 10 includes a plurality of first sampling chips 101 , and the plurality of first sampling chips 10 are serially connected to each other and the first and the last first sampling chip 101 are electrically connected to the controller 60 via a first communication module 30 .

[0091] For example, the controller 60 communicates with the first first sampling chip 101 , and after the communication signal comes out of the first first sampling chip 101 , it enters the subsequent first sampling chips 101 , so that the controller 60 can communicate with all the first sampling chips 101 .

[0092] A first communication component 31 is connected between the first first sampling chip 101 and the controller 60, and a first communication component 31 is also connected between the last first sampling chip 101 and the controller 60. The two first communication components 31 are connected to the same first interface chip 32. In this way, bidirectional communication can be achieved on the communication link. When a first sampling chip 101 fails, the other first sampling chips 101 can still communicate with the controller 60.

[0093] Exemplarily, the first sampling chips 101 connected in series can communicate with each other via a daisy chain.

[0094] Based on the same technical concept, an embodiment of the present application also provides a battery device. Fig. 9 FIG. 1 is a schematic diagram of the structure of a battery device according to an embodiment of the present application. Fig. 9 As shown, the battery device 200 includes a battery 300 and a battery management system 100, and the battery 300 is electrically connected to the battery management system 100. The battery 300 may include a plurality of single cells. The battery management system 100 includes the battery management system in any of the above embodiments. It can be understood that the battery device has the beneficial effects of the battery management system provided in the embodiments of the present application, and the specific description of the battery management system in the above embodiments can be referred to, which will not be repeated in this embodiment.

[0095] Based on the same technical concept, the present application also provides an electrical device. Fig.10 FIG. 1 is a schematic diagram of the structure of an electric device according to an embodiment of the present application. Fig.10 As shown, the power device 400 includes a battery device 200, and the battery device 200 includes a battery management system in any of the above embodiments. It can be understood that the power device has the beneficial effects of the battery management system provided in the embodiments of the present application, and the specific description of the battery management system in the above embodiments can be referred to, and this embodiment will not be repeated here.

[0096] It should be noted that, in the above embodiments, the resistor is represented by a single resistor. In other embodiments, the resistor may also be an integration of series, parallel or hybrid resistors. In addition, in the above embodiments, the capacitor is represented by a single capacitor. In other embodiments, the capacitor may also be an integration of series, parallel or hybrid capacitors. The specific parameters of each device may be set according to actual needs, and this application does not limit this.

[0097] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0098] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery management system, characterized in that: It includes a first sampling module, a second sampling module, a first communication module, a second communication module, a third communication module and a controller: The first sampling module is electrically connected to the controller via the first communication module; The second sampling module is electrically connected to the controller via the second communication module; The first sampling module and the second sampling module can be selectively communicated with each other through the third communication module.

2. The battery management system according to claim 1, characterized in that: The third communication module includes a switch device, and the first sampling module and the second sampling module are electrically connected through the switch device.

3. The battery management system according to claim 1, characterized in that: The controller is configured to control the voltage of a connection pin between the first sampling module and the second sampling module to control whether the first sampling module and the second sampling module are connected.

4. The battery management system according to claim 1, characterized in that: The first sampling module is configured to: control the voltage of the connecting pin between the first sampling module and the second sampling module to control whether the first sampling module is connected with the second sampling module; And / or, the second sampling module is configured to: control the voltage of its own connecting pin with the first sampling module to control whether the first sampling module is connected to the second sampling module.

5. The battery management system according to any one of claims 1 to 4, characterized in that: The first communication module includes a first communication component and a first interface chip. The first sampling module is electrically connected to the first interface chip via the first communication component. The first interface chip is electrically connected to the controller.

6. The battery management system according to claim 5, characterized in that: The first communication element includes a first daisy chain.

7. The battery management system according to claim 6, characterized in that: The number of the first daisy chains is at least 2.

8. The battery management system according to any one of claims 1 to 4, characterized in that: The second sampling module and the controller are arranged on different circuit boards; The second communication module includes a second communication component and a second interface chip. The second sampling module is electrically connected to the second interface chip via the second communication component. The second interface chip is electrically connected to the controller.

9. The battery management system according to claim 8, characterized in that: The second communication element includes a second daisy chain.

10. The battery management system according to any one of claims 1 to 4, characterized in that: The second sampling module and the controller are arranged on the same circuit board; The second communication module includes a third communication component, the second sampling module is electrically connected to the controller via the third communication component, and the third communication component is configured to enable isolated communication between the second sampling module and the controller.

11. The battery management system according to claim 10, characterized in that: The third communication component includes an isolated serial peripheral interface SPI.

12. The battery management system according to any one of claims 1 to 4, characterized in that: The first sampling module includes a plurality of first sampling chips, the plurality of first sampling chips communicate in series, and the first and the last first sampling chips are each electrically connected to the controller via a first communication component.

13. The battery management system according to any one of claims 1 to 4, characterized in that: The first sampling module is configured to implement at least one of the following: collecting the voltage of a single cell in the battery, collecting the temperature, and performing equalization control; The second sampling module is configured to implement at least one of the following: sampling the current on the busbar connected to the battery, sampling the voltage inside and / or outside the positive relay connected to the battery, and sampling the insulation resistance.

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

15. An electrical device, characterized in that: Comprising the battery device as claimed in claim 14.

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