Battery management system, battery device and power consumption device

Abstract

The present application provides a battery management system, a battery device and an electrical device, belonging to the field of battery technology. The battery management system includes a relay and a relay control circuit, the relay control circuit includes a first relay drive circuit, a second relay drive circuit and a first OR gate circuit, the first relay drive circuit includes a first enable input terminal and a first signal output terminal, the second relay drive circuit includes a second enable input terminal and a second signal output terminal, the input terminal of the first OR gate circuit is connected to the first signal output terminal and the second signal output terminal respectively, and the output terminal of the first OR gate circuit is used to connect to the relay; wherein the second enable input terminal is connected to the second signal output terminal to receive the relay control signal output by the second signal output terminal and used as a relay enable signal. The battery management system can improve the situation of abnormal disconnection of the relay and improve the stability of continuous output of the battery.

Description

Technical Field

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

[0002] The battery management system is a system that can effectively manage and monitor battery packs. A relay is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity reaches the specified requirement. In the battery management system, relays play an important role in controlling the circuit and protecting the power supply.

[0003] When a battery management system fails, the relay may be abnormally disconnected. At present, in order to prevent the abnormal disconnection, a delayed output enable signal is used. However, the time for the delayed output to maintain the drive is limited, and the relay may still be abnormally disconnected. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems in the background technology. To this end, one purpose of the present application is to provide a battery management system, a battery device and an electric device to improve the abnormal disconnection of the relay and enhance the stability of the continuous output of the battery.

[0005] An embodiment of the first aspect of the present application provides a battery management system, which includes at least one relay and a relay control circuit, the relay control circuit is used to control the relay to be opened or closed; the relay control circuit includes a first relay drive circuit, a second relay drive circuit and a first OR gate circuit, the first relay drive circuit includes a first enable input terminal and a first signal output terminal, the first enable input terminal is used to receive a relay enable signal, and the first signal output terminal is used to output a relay control signal; the second relay drive circuit includes a second enable input terminal and a second signal output terminal, the second enable input terminal is used to receive a relay enable signal, and the second signal output terminal is used to output a relay control signal, and the input terminal of the first OR gate circuit is respectively connected to the first signal output terminal and the second signal output terminal, and the output terminal of the first OR gate circuit is used to be connected to the relay; wherein, the second enable input terminal is connected to the second signal output terminal to receive the relay control signal output by the second signal output terminal and use it as a relay enable signal.

[0006] In the technical solution of the embodiment of the present application, a first relay drive circuit and a second relay drive circuit are respectively set up, and a first OR gate circuit is used to connect to the relay, so as to realize a redundant design to improve the reliability of the battery management system. At the same time, the second enable input terminal is connected to the second signal output terminal, and a feedback connection method is used to receive the relay control signal output by the second signal output terminal and use it as a relay enable signal, so as to lock the enable signal of the second relay drive circuit to form a self-locking state, and utilize the latched output state to maintain the stability of the relay control signal, thereby avoiding abnormal disconnection of the relay as much as possible and improving the stability of the continuous output of the battery.

[0007] In some embodiments, the second enable input terminal is also connected to the first signal output terminal to receive the relay control signal output by the first signal output terminal and use it as a relay enable signal. By connecting the second enable input terminal to the first signal output terminal, the enable signal sent by the first signal output terminal is used as the drive signal of the second relay drive circuit, a redundant drive structure is realized without the need for additional access to the enable signal, thereby simplifying the entire battery management system.

[0008] In some embodiments, the second enable input terminal is also connected to the first enable input terminal, so that one of the first enable input terminal and the second enable input terminal can be used to receive the relay enable signal provided to the other. By directly connecting the second enable input terminal to the first enable input terminal, the enable signal can be input to the first relay drive circuit and the second relay drive circuit at the same time, and any failure of any relay drive circuit will not cause an interruption in the transmission of the enable signal, thereby improving the stability of the continuous output of the battery.

[0009] In some embodiments, the first relay driving circuit and the second relay driving circuit are both low-side driving chips, and the relay control signal output by the first signal output terminal is at a low level. By using a low-side driving chip, only the ground terminal of the control circuit needs to be controlled, and there is no need to deal with complex voltage and current problems at the power supply terminal, so that the battery management system structure is more concise, the debugging process is easier, and even if a fault occurs, there will be no problem of excessive voltage at both ends of the load, providing stable performance.

[0010] In some embodiments, the first relay drive circuit and the second relay drive circuit are both high-side drive chips, and the relay control signal output by the first signal output terminal is at a high level. By adopting a high-side drive chip, the electrical isolation between the relay and the power supply can be better achieved. Even in the case of a failure in the battery management system, since the high-side drive chip controls the positive side of the power supply, the relay can be prevented from accidentally grounding, thereby avoiding possible short circuits and safety hazards. At the same time, when it is detected that the relay cannot work normally, it can be determined whether it is a power supply problem or a load problem by monitoring the output state of the high-side drive chip, which is helpful for fault diagnosis.

[0011] In some embodiments, the relay control circuit further includes a third relay drive circuit, the third relay drive circuit includes a third enable input terminal and a third signal output terminal, the third enable input terminal is used to receive a relay enable signal, the third signal output terminal is used to output a relay control signal, and the third signal output terminal and the output terminal of the first OR gate circuit are respectively connected to the two ends of the relay; wherein the third relay drive circuit is a low-side drive chip, and the relay control signal output by the third signal output terminal is a low level. By setting the third relay drive circuit, the third relay drive circuit is a low-side drive chip, and the first relay drive circuit and the second relay drive circuit are both high-side drive chips, high and low-side simultaneous drive can be achieved, and high and low-side simultaneous drive improves the reliability and safety of the system by avoiding the problem of false drive when a single high-side control is shorted to power supply and a single low-side control is shorted to ground.

[0012] In some embodiments, the relay control circuit also includes a fourth relay drive circuit, the fourth relay drive circuit includes a fourth enable input terminal and a fourth signal output terminal, the fourth enable input terminal is used to receive a relay enable signal, and the fourth signal output terminal is used to output a relay control signal; the relay control circuit also includes a second OR gate circuit, the input terminal of the second OR gate circuit is respectively connected to the third signal output terminal and the fourth signal output terminal, and the output terminal of the second OR gate circuit and the output terminal of the first OR gate circuit are respectively connected to the two ends of the relay; wherein, the fourth relay drive circuit is a low-side drive chip, and the relay control signal output by the fourth signal output terminal is a low level. By setting the fourth relay drive circuit, the fourth relay drive circuit and the third relay drive circuit are low-side drive chips, and the first relay drive circuit and the second relay drive circuit are both high-side drive chips, which can realize simultaneous high and low-side drive, thereby improving the reliability and safety of the system. And the fourth relay drive circuit can be used as a redundant solution for the third relay drive circuit to improve the stability of continuous output of the battery.

[0013] In some embodiments, the fourth enable input terminal is connected to the first signal output terminal to receive the relay control signal output by the first signal output terminal and use it as a relay enable signal. By connecting the fourth enable input terminal to the first signal output terminal, the enable signal sent by the first signal output terminal is used as the drive signal of the fourth relay drive circuit, a redundant drive structure is realized without the need for additional access to the enable signal, thereby simplifying the entire battery management system.

[0014] In some embodiments, the fourth enable input terminal is connected to the second signal output terminal to receive the relay control signal output by the second signal output terminal and use it as a relay enable signal. By connecting the fourth enable input terminal to the second signal output terminal, the enable signal sent by the second signal output terminal is used as the drive signal of the fourth relay drive circuit, so that a redundant drive structure is realized without the need for additional access to the enable signal, thereby simplifying the entire battery management system.

[0015] In some embodiments, the fourth enable input terminal is connected to the third enable input terminal, so that one of the third enable input terminal and the fourth enable input terminal can be used to receive a relay enable signal provided to the other. By directly connecting the fourth enable input terminal to the third enable input terminal, the enable signal can be input to the fourth relay drive circuit and the third relay drive circuit at the same time, and the failure of the third relay drive circuit or the fourth relay drive circuit will not cause the interruption of the enable signal transmission, thereby improving the stability of the continuous output of the battery.

[0016] An embodiment of a second aspect of the present application provides a battery device, which includes the battery management system in the above embodiment.

[0017] An embodiment of the third aspect of the present application provides an electrical device, which includes the battery device in the above embodiment.

[0018] 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

[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0020] Figure 1 A battery management system structure diagram of some embodiments of the present application Figure 1 ;

[0021] Figure 2 A battery management system structure diagram of some embodiments of the present application Figure 2 ;

[0022] Figure 3 A battery management system structure diagram of some embodiments of the present application Figure 3 ;

[0023] Figure 4 A battery management system structure diagram of some embodiments of the present application Figure 4 ;

[0024] Figure 5 A battery management system structure diagram of some embodiments of the present application Figure 5 ;

[0025] Figure 6 A battery management system structure diagram of some embodiments of the present application Figure 6 ;

[0026] Figure 7 A battery management system structure diagram of some embodiments of the present application Figure 7 ;

[0027] Figure 8 A battery management system structure diagram of some embodiments of the present application Figure 8 .

[0028] Description of reference numerals:

[0029] 100. Battery management system; 110. Relay; 120. Relay control circuit; 121. First relay drive circuit; 122. Second relay drive circuit; 123. First OR gate circuit; 124. Third relay drive circuit; 125. Fourth relay drive circuit; 126. Low-side drive chip; 127. High-side drive chip; 128. Second OR gate circuit; 130. First battery management unit; 140. Second battery management unit; 141. Power switch; 142. Internal power supply; 150. Enable signal generation module. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0032] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0033] Reference to "embodiments" herein 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 herein may be combined with other embodiments.

[0034] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0035] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0036] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be a connection between two elements or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0039] The battery management system is a system that can effectively manage and monitor the battery pack. A relay is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity reaches the specified requirement. The relay retention function allows the battery control system to maintain continuous output of the battery even if a serious fault occurs. For example, when the vehicle is driving at high speed, the control system freezes or loses power. At this time, the relay that controls the vehicle's power output will be disconnected, causing the vehicle to lose power; for example, during the charging process of the vehicle, the relay may be occasionally interrupted due to external factors, resulting in the inability to complete charging of the entire vehicle. Therefore, it is necessary to avoid abnormal disconnection of the relay under specific working conditions as much as possible.

[0040] In order to prevent the relay from disconnecting abnormally, a backup drive solution is usually added to the BMS (Battery Management System) or a delayed output enable signal is used. The backup drive solution directly builds two relay drive circuits, which increases the manufacturing cost. In addition, if the BMU (Battery Management Unit) where the two relay drive circuits are located fails, the relay will still disconnect abnormally. When the delayed output enable signal is used, the time for the delayed output to maintain the drive is limited. After the delayed signal is lost, if the control system has not returned to normal, the relay will still disconnect.

[0041] In order to solve the above problems, the present application provides a battery management system, which includes a relay and a relay control circuit, the relay control circuit includes a first relay drive circuit, a second relay drive circuit and a first OR gate circuit, the first relay drive circuit includes a first enable input terminal and a first signal output terminal, the second relay drive circuit includes a second enable input terminal and a second signal output terminal, the input terminal of the first OR gate circuit is connected to the first signal output terminal and the second signal output terminal respectively, and the output terminal of the first OR gate circuit is used to connect to the relay; wherein the second enable input terminal is connected to the second signal output terminal to receive the relay control signal output by the second signal output terminal and used as a relay enable signal. The battery management system can realize redundant design to improve the reliability of the battery management system, and at the same time, the enable signal of the second relay drive circuit is locked by feedback connection to form self-locking, and the latched output state is used to maintain the stability of the relay control signal, so as to avoid abnormal disconnection of the relay as much as possible, and improve the stability of the continuous output of the battery.

[0042] The battery management system disclosed in the embodiment of the present application can be used, but is not limited to, in a battery device composed of multiple single cells connected in series, in parallel, or in a combination of series and parallel. The battery device can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like. The battery device can also be used in energy storage devices, which include, but are not limited to, containerized energy storage, distributed energy storage, and the like.

[0043] The present application embodiment provides a battery management system, such as Figure 1 and Figure 2 As shown, Figure 1 A battery management system structure diagram of some embodiments of the present application Figure 1 ; Figure 2 A battery management system structure diagram of some embodiments of the present application Figure 2The battery management system 100 includes at least one relay 110, and a relay control circuit 120, the relay control circuit 120 is used to control the relay 110 to open or close; the relay control circuit 120 includes a first relay drive circuit 121, a second relay drive circuit 122 and a first OR gate circuit 123, the first relay drive circuit 121 includes a first enable input terminal and a first signal output terminal, the first enable input terminal is used to receive a relay enable signal, and the first signal output terminal is used to output a relay control signal; the second relay drive circuit 122 includes a second enable input terminal and a second signal output terminal, the second enable input terminal is used to receive a relay enable signal, and the second signal output terminal is used to output a relay control signal, and the input terminal of the first OR gate circuit 123 is connected to the first signal output terminal and the second signal output terminal respectively, and the output terminal of the first OR gate circuit 123 is used to connect to the relay; wherein, the second enable input terminal is connected to the second signal output terminal to receive the relay control signal output by the second signal output terminal and used as the relay 110 enable signal.

[0044] The battery management system 100 includes a relay 110 and a relay control circuit 120 . The relay 110 and the relay control circuit 120 are connected via a line. The relay control circuit 120 controls the relay 110 to open or close by outputting a relay control signal.

[0045] The relay control circuit 120 includes a first relay drive circuit 121. The battery management system 100 includes a first battery management unit 130 according to the management framework system. The first relay drive circuit 121 is located in the first battery management unit 130. The first relay drive circuit 121 includes a first enable input terminal and a first signal output terminal. The relay enable signal enters the first relay drive circuit 121 from the first enable input terminal, and then outputs the relay control signal through the first signal output terminal.

[0046] It should be noted that the relay enable signal may come from inside the first battery management unit 130, such as Figure 1 It can also be driven directly by a hard line from outside the first battery management unit 130, such as Figure 2 For the convenience of description, the enable signal generation module 150 is taken as an example to generate the relay enable signal, and the enable signal generation module 150 is located inside the first battery management unit 130 .

[0047] The relay control circuit 120 also includes a second relay drive circuit 122. In some embodiments, the second relay drive circuit 122 can be located in the second battery management unit 140 of the battery management system 100. The second battery management unit 140 can be connected or communicated with the first battery management unit 130 in any feasible manner. For example, the two can be used together to control the relay. The second relay drive circuit 122 includes a second enable input terminal and a second signal output terminal. The second enable input terminal is used to receive a relay enable signal, and the second signal output terminal is used to output a relay control signal.

[0048] It should be noted that the relay enable signal of the second relay drive circuit 122 may come from inside the second battery management unit 140 , may come from a hard-line direct drive outside the second battery management unit 140 , or may come from the first battery management unit 130 .

[0049] The input end of the first OR gate circuit 123 is respectively connected to the first signal output end and the second signal output end, so that a redundancy function can be achieved. If one of the first relay drive circuit 121 or the second relay drive circuit 122 can work normally, the relay control signal can be transmitted to the relay 110, thereby improving the reliability of the relay control signal transmission.

[0050] The second enable input terminal is connected to the second signal output terminal to form a feedback connection. The second enable input terminal receives the relay control signal output by the second signal output terminal and uses it as a relay enable signal to lock the enable signal of the second relay drive circuit to form self-locking, and uses the latched output state to maintain the stability of the relay control signal.

[0051] It should be noted that the first relay drive circuit 121 and the second relay drive circuit 122 are backup drive circuits for each other. Both the first relay drive circuit 121 and the second relay drive circuit 122 require power supply maintenance and operation. In order to save energy, a power control circuit can be set separately. For example, a power switch 141 and an internal power supply 142 are set in the second battery management unit 140. When a circuit that requires a backup drive is used, the power switch 141 is closed to realize the backup of the relay drive circuit; when a circuit that does not require a backup drive is used, the power switch 141 is disconnected to reduce the energy consumption of the second relay drive circuit 122. The setting of the power switch 141 can improve the adaptability and operability of the battery management system 100.

[0052] By respectively setting the first relay drive circuit 121 and the second relay drive circuit 122, and connecting to the relay 110 using the first OR gate circuit 123, a redundant design is implemented to improve the reliability of the battery management system 100. At the same time, the second enable input terminal is connected to the second signal output terminal, and a relay control signal output by the second signal output terminal is received through a feedback connection and used as a relay enable signal. The relay enable signal of the second relay drive circuit 122 is locked to form a self-locking state, and the latched output state is used to maintain the stability of the relay control signal, thereby avoiding abnormal disconnection of the relay 110 as much as possible, thereby improving the stability of the continuous output of the battery.

[0053] According to some embodiments of the present application, Figure 1 As shown, the second enable input terminal is also connected to the first signal output terminal to receive the relay control signal output by the first signal output terminal and use it as a relay enable signal.

[0054] The enable signal generating module 150 or the external hard-line direct drive sends out the relay enable signal, the first enable input terminal receives the relay enable signal, and outputs the relay control signal through the first signal output terminal, the relay control signal output from the first signal output terminal is divided into two transmission lines, one is directly connected to the relay 110 through the first OR gate circuit 123, and is used to transmit the relay control signal to the relay 110; the other is connected to the second enable input terminal, the second enable input terminal receives the relay control signal output from the first signal output terminal, and is used as the enable signal of the second relay drive circuit 122, the relay control signal output from the second signal output terminal is divided into two transmission lines, one is directly connected to the relay 110 through the first OR gate circuit 123, and is used to transmit the relay control signal to the relay 110, and the other is connected to the second enable input terminal to lock the enable signal of the second relay drive circuit 122 to form a self-locking.

[0055] By connecting the second enable input terminal to the first signal output terminal and using the enable signal sent by the first signal output terminal as the drive signal of the second relay drive circuit, a redundant drive structure is realized without the need for additional access to the enable signal, thereby simplifying the entire battery management system 100.

[0056] According to some embodiments of the present application, Figure 3 As shown, Figure 3 A battery management system structure diagram of some embodiments of the present application Figure 3 The second enable input terminal is also connected to the first enable input terminal so that one of the first enable input terminal and the second enable input terminal can be used to receive the relay enable signal provided to the other.

[0057] The enable signal generating module 150 or the external hard-line direct drive sends out the relay enable signal, the second enable input terminal is connected to the first enable input terminal, both the first enable input terminal and the second enable input terminal can receive the relay enable signal, the relay control signal output by the first signal output terminal is directly connected to the relay 110 through the first OR gate circuit 123, and is used to transmit the relay control signal to the relay 110; the relay control signal output by the second signal output terminal is divided into two transmission lines, one is directly connected to the relay 110 through the first OR gate circuit 123, and is used to transmit the relay control signal to the relay 110, and the other is connected to the second enable input terminal to lock the relay enable signal of the second relay drive circuit 122 to form a self-locking.

[0058] By directly connecting the second enable input terminal to the first enable input terminal, the enable signal can be input to the first relay drive circuit 121 and the second relay drive circuit 122 at the same time. Failure of any relay drive circuit will not cause interruption of the enable signal transmission, thereby improving the stability of continuous battery output.

[0059] According to some embodiments of the present application, Figure 2 As shown, the first relay driving circuit and the second relay driving circuit are both low-side driving chips, and the relay control signal output by the first signal output terminal is a low level.

[0060] The first relay drive circuit 121 and the second relay drive circuit 122 are both low-side driver chips 126, namely LSD (Low Side Driver). The low-side driver chip 126 is located between the relay 110 and the ground, and can drive the relay 110 by controlling the switch at the ground end. It can be understood that a controllable switch is added to the ground end of the circuit, and the opening and closing of the switch can control the on and off of the relay 110. The relay control signal output by the first signal output terminal is a low level to control the closing of the relay 110.

[0061] By adopting the low-side driver chip 126, only the ground terminal of the control circuit needs to be controlled, and there is no need to deal with complex voltage and current problems at the power supply end. This makes the battery management system 100 structure more concise and the debugging process easier. Even if a fault occurs, there will be no problem of excessive voltage at both ends of the load, providing stable performance.

[0062] According to some embodiments of the present application, Figure 1 As shown, the first relay driving circuit 121 and the second relay driving circuit 122 are both high-side driving chips 127, and the relay control signal output by the first signal output terminal is a high level.

[0063] The first relay driving circuit 121 and the second relay driving circuit 122 are both high side driver chips 127 , namely HSD (High Side Driver). The high side driver chip 127 is located between the power supply and the relay 110 . The power supply supplies power to the relay 110 through the high side driver chip 127 .

[0064] Exemplarily, when the relay 110 needs to be closed, the first enable input terminal of the high-side driver chip 127 in the first battery management unit 130 receives the relay enable signal, and the high-side driver chip 127 outputs the relay control signal as a high level through the first signal output terminal. The high level is used to drive the relay 110 and simultaneously drive the high-side driver chip 127 in the second battery management unit 140. The second signal output terminal of the high-side driver chip 127 in the second battery management unit 140 outputs an enable signal for locking the main body, thereby forming self-locking.

[0065] Exemplarily, when the relay 110 needs to be disconnected, the first enable input terminal of the high-side driver chip 127 in the first battery management unit 130 receives a relay signal, and the high-side driver chip 127 outputs a relay control signal of a low level through the first signal output terminal. At the same time, the power switch 141 in the second battery management unit 140 can be disconnected. If the relay 110 does not receive a closing signal, it will be disconnected.

[0066] It should be noted that for the solution using the high-side driver chip 127, overcurrent protection needs to be designed to avoid abnormal short-circuit failure of the relay 110, which causes a sharp increase in the current in the circuit and damage to the high-side driver chip 127 and the relay 110. The protection of the high-side driver chip 127 can adopt a high-side driver chip with a built-in overcurrent protection function, utilize the overcurrent protection function integrated inside the chip, or use an external overcurrent protection circuit, such as a fuse.

[0067] By using the high-side driver chip 127, the electrical isolation between the relay 110 and the power supply can be better achieved. Even if the battery management system 100 fails, since the high-side driver chip 127 controls the positive side of the power supply, the relay 110 can be prevented from accidentally being grounded, thereby avoiding possible short circuits and safety hazards. At the same time, when it is detected that the relay cannot work normally, the output state of the high-side driver chip 127 can be monitored to determine whether it is a power supply problem or a load problem, which is helpful for fault diagnosis.

[0068] According to some embodiments of the present application, Figure 4 As shown, Figure 4 A battery management system structure diagram of some embodiments of the present application Figure 4The relay control circuit 120 also includes a third relay drive circuit 124, which includes a third enable input terminal and a third signal output terminal, wherein the third enable input terminal is used to receive a relay enable signal, and the third signal output terminal is used to output a relay control signal, and the third signal output terminal and the output terminal of the first OR gate circuit 123 are respectively connected to the two ends of the relay 110; wherein the third relay drive circuit 124 is a low-side drive chip 126, and the relay control signal output by the third signal output terminal is a low level.

[0069] The relay control circuit 120 includes a third relay drive circuit 124, which is located in the first battery management unit 130. The third relay drive circuit 124 includes a third enable input terminal and a third signal output terminal. The first relay drive circuit 121 and the second relay drive circuit 122 are both high-side drive chips 127, which are connected to one end of the relay 110 through the first OR gate circuit 123; the third relay drive circuit 124 is a low-side drive chip 126 connected to the other end of the relay 110.

[0070] There is no limitation on the source of the relay enable signal received by the first enable input terminal, the second enable input terminal and the third enable input terminal. For example, the first enable input terminal and the third enable input terminal receive the relay enable signal issued by the enable signal generating module 150, and the second enable input terminal receives the relay control signal output by the first signal output terminal and is used as the enable signal of the second relay drive circuit 122.

[0071] The relay control signal outputted from the first signal output terminal is divided into two transmission lines, one of which is directly connected to the relay 110 through the first OR gate circuit 123; the other is connected to the second enable input terminal, and the relay control signal outputted from the second signal output terminal is connected to the relay 110 through the first OR gate circuit 123. The relay control signal outputted from the third enable input terminal is directly connected to the other end of the relay 110.

[0072] Any one of the first relay drive circuit 121 and the second relay drive circuit 122 can output a relay control signal, and the third relay drive circuit 124 outputs a relay control signal, and the relay 110 can obtain a control signal. For example, the first relay drive circuit 121 and the third relay drive circuit 124 output relay control signals, for example, the second relay drive circuit 122 and the third relay drive circuit 124 output relay control signals, and so on.

[0073] By setting a third relay drive circuit 124, the third relay drive circuit 124 is a low-side drive chip 126, and the first relay drive circuit 121 and the second relay drive circuit 122 are both high-side drive chips 127, it is possible to achieve simultaneous high and low side driving. The simultaneous high and low side driving improves the reliability and safety of the system by avoiding the problem of false driving when the single high side controls the short power supply and the single low side controls the short ground.

[0074] According to some embodiments of the present application, Figure 5 As shown, Figure 5 A battery management system structure diagram of some embodiments of the present application Figure 5 The relay control circuit 120 further includes a fourth relay drive circuit 125, which includes a fourth enable input terminal and a fourth signal output terminal, wherein the fourth enable input terminal is used to receive a relay enable signal, and the fourth signal output terminal is used to output a relay control signal; the relay control circuit 120 further includes a second OR gate circuit 128, wherein the input terminal of the second OR gate circuit 128 is respectively connected to the third signal output terminal and the fourth signal output terminal, and the output terminal of the second OR gate circuit 128 and the output terminal of the first OR gate circuit 123 are respectively connected to the two ends of the relay 110; wherein the fourth relay drive circuit 125 is a low-side drive chip 126, and the relay control signal outputted by the fourth signal output terminal is a low level.

[0075] The relay control circuit 120 includes a fourth relay drive circuit 125, which is located in the second battery management unit 140. The fourth relay drive circuit 125 includes a third enable input terminal and a third signal output terminal. The first relay drive circuit 121 and the second relay drive circuit 122 are both high-side drive chips 127, which are connected to one end of the relay 110 through a first OR gate circuit 123; the third relay drive circuit 124 and the fourth relay drive circuit 125 are low-side drive chips 126, which are connected to the other end of the relay 110 through a second OR gate circuit 128.

[0076] The source of the relay enable signal received by the fourth enable input terminal is also not limited, and the source includes internal or external. For example, the fourth enable input terminal receives the relay enable signal issued by the enable signal generation module 150; for example, the fourth enable input terminal receives the relay control signal output by the first signal output terminal and is used as the enable signal of the fourth relay drive circuit 125; for example, the fourth enable input terminal receives the relay enable signal of an external hard-line direct drive.

[0077] Only when any one of the first relay drive circuit 121 and the second relay drive circuit 122 can output a relay control signal, and any one of the third relay drive circuit 124 and the fourth relay drive circuit 125 can output a relay control signal, can the relay 110 obtain a control signal. For example, the first relay drive circuit 121 and the third relay drive circuit 124 output a relay control signal; for example, the first relay drive circuit 121 and the fourth relay drive circuit 125 output a relay control signal, and so on.

[0078] By setting the fourth relay drive circuit 125, the fourth relay drive circuit 125 and the third relay drive circuit 124 are low-side drive chips 126, and the first relay drive circuit 121 and the second relay drive circuit 122 are both high-side drive chips 127, which can achieve simultaneous high and low-side drive, thereby improving the reliability and safety of the system. In addition, the fourth relay drive circuit 125 can serve as a redundant solution for the third relay drive circuit 124 to improve the stability of the continuous output of the battery.

[0079] According to some embodiments of the present application, Figure 5 As shown, the fourth enable input terminal is connected to the first signal output terminal to receive the relay control signal output by the first signal output terminal and use it as a relay enable signal.

[0080] The first relay drive circuit 121 and the second relay drive circuit 122 are both high-side drive chips 127, which are connected to one end of the relay 110 through the first OR gate circuit 123; the third relay drive circuit 124 and the fourth relay drive circuit 125 are low-side drive chips 126, which are connected to the other end of the relay 110 through the second OR gate circuit 128.

[0081] Exemplarily, the first enable input terminal and the third enable input terminal receive the relay enable signal sent by the enable signal generating module 150, and the relay control signal output by the first signal output terminal is divided into three transmission lines, one of which is directly connected to the relay 110 through the first OR gate circuit 123; one is connected to the second enable input terminal and used as the relay enable signal of the second relay driving circuit 122, and the second signal output terminal outputs the relay control signal and is connected to the relay 110 through the first OR gate circuit 123; the other is connected to the fourth enable input terminal and used as the relay enable signal of the fourth relay driving circuit 125, and the fourth signal output terminal outputs the relay control signal and is connected to the other end of the relay 110 through the second OR gate circuit 128. The relay control signal output by the third enable input terminal is connected to the other end of the relay 110 through the second OR gate circuit 128.

[0082] By connecting the fourth enable input terminal to the first signal output terminal and using the enable signal emitted by the first signal output terminal as the drive signal of the fourth relay drive circuit 125, a redundant drive structure is realized without the need for additional access to the enable signal, thereby simplifying the entire battery management system.

[0083] According to some embodiments of the present application, Figure 6 As shown, Figure 6 A battery management system structure diagram of some embodiments of the present application Figure 6 The fourth enable input terminal is connected to the second signal output terminal to receive the relay control signal output by the second signal output terminal and use it as a relay enable signal.

[0084] The first relay drive circuit 121 and the second relay drive circuit 122 are both high-side drive chips 127, which are connected to one end of the relay 110 through the first OR gate circuit 123; the third relay drive circuit 124 and the fourth relay drive circuit 125 are low-side drive chips 126, which are connected to the other end of the relay 110 through the second OR gate circuit 128.

[0085] Exemplarily, the first enable input terminal and the third enable input terminal receive the relay enable signal sent by the enable signal generating module 150, and the relay control signal output by the first signal output terminal is divided into two transmission lines, one of which is directly connected to the relay 110 through the first OR gate circuit 123; the other is connected to the second enable input terminal and used as the relay enable signal of the second relay driving circuit 122. The relay control signal output by the second signal output terminal is connected to the relay 110 through the first OR gate circuit 123. The relay control signal output by the second signal output terminal is divided into three transmission lines, one of which is directly connected to the relay 110 through the first OR gate circuit 123; one is connected to the second enable input terminal to lock the relay enable signal of the second relay driving circuit 122 to form a self-locking; and the other is connected to the fourth enable input terminal, which receives the relay control signal output by the second signal output terminal and uses it as the relay enable signal.

[0086] By connecting the fourth enable input terminal to the second signal output terminal and using the enable signal emitted by the second signal output terminal as the drive signal of the fourth relay drive circuit, a redundant drive structure is realized without the need for additional access to the enable signal, thereby simplifying the entire battery management system.

[0087] According to some embodiments of the present application, Figure 7 As shown, Figure 7 A battery management system structure diagram of some embodiments of the present application Figure 7The fourth enable input terminal is connected to the third enable input terminal so that one of the third enable input terminal and the fourth enable input terminal can be used to receive the relay enable signal provided to the other.

[0088] The first relay drive circuit 121 and the second relay drive circuit 122 are both high-side drive chips 127, which are connected to one end of the relay 110 through the first OR gate circuit 123; the third relay drive circuit 124 and the fourth relay drive circuit 125 are low-side drive chips 126, which are connected to the other end of the relay 110 through the second OR gate circuit 128.

[0089] For example, Figure 7 As shown, the first enable input terminal, the second enable input terminal, the third enable input terminal and the fourth enable input terminal are interconnected and can receive the relay enable signal sent by the enable signal generating module 150. The relay control signal output by the first signal output terminal is connected to the relay 110 through the first OR gate circuit 123; the relay control signal output by the second signal output terminal is divided into two transmission lines, one is directly connected to the relay 110 through the first OR gate circuit 123, and the other is connected to the second enable input terminal, locking the relay enable signal of the second relay driving circuit 122 to form a self-locking. The relay control signals output by the third signal output terminal and the fourth signal output terminal are connected to the relay 110 through the second OR gate circuit 128.

[0090] Exemplarily, the first enable input terminal, the third enable input terminal and the fourth enable input terminal are connected to each other and can receive the relay enable signal sent by the enable signal generating module 150. The relay control signal output by the first signal output terminal is divided into two transmission lines, one of which is directly connected to the relay 110 through the first OR gate circuit 123, and the other is connected to the second enable input terminal and used as the relay enable signal of the second relay driving circuit 122. The relay control signals output by the third signal output terminal and the fourth signal output terminal are connected to the relay 110 through the second OR gate circuit 128.

[0091] By directly connecting the fourth enable input terminal with the third enable input terminal, the enable signal can be input to the fourth relay drive circuit and the third relay drive circuit at the same time. Failure of the third relay drive circuit or the fourth relay drive circuit will not cause interruption of the enable signal transmission, thereby improving the stability of the battery's continuous output.

[0092] An embodiment of the present application provides a battery device, which includes the battery management system in the above embodiment.

[0093] An embodiment of the present application provides an electrical device, which includes the battery device in the above embodiment.

[0094] According to some embodiments of the present application, Figure 8 As shown, Figure 8 A battery management system structure diagram of some embodiments of the present application Figure 8 The relay control circuit 120 includes a first relay drive circuit 121, a second relay drive circuit 122, a first OR gate circuit 123, a third relay drive circuit 124, a fourth relay drive circuit 125, and a second OR gate circuit 128. The first relay drive circuit 121 and the second relay drive circuit 122 are both high-side drive chips 127, and the third relay drive circuit 124 and the fourth relay drive circuit 125 are both low-side drive chips 126.

[0095] The first enable input terminal, the second enable input terminal, the third enable input terminal and the fourth enable input terminal are connected to each other and can receive the relay enable signal sent by the enable signal generating module 150 .

[0096] The relay control signal output from the first signal output terminal is divided into three transmission lines, one of which is directly connected to the relay 110 through the first OR gate circuit 123; one is connected to the second enable input terminal and used as the relay enable signal of the second relay drive circuit 122; and the other is connected to the fourth enable input terminal and used as the relay enable signal of the fourth relay drive circuit 125.

[0097] The relay control signal output from the second signal output terminal is divided into three transmission lines, one of which is directly connected to the relay 110 through the first OR gate circuit 123; one is connected to the second enable input terminal to lock the relay enable signal of the second relay drive circuit 122 to form self-locking; and the other is connected to the fourth enable input terminal to be used as the relay enable signal of the fourth relay drive circuit 125.

[0098] The relay control signals outputted from the third signal output terminal and the fourth signal output terminal are connected to the relay 110 via the second OR gate circuit 128 .

[0099] 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 them; 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery management system, characterized in that: include: at least one relay, and A relay control circuit, the relay control circuit is used to control the relay to open or close; The relay control circuit includes: a first relay driving circuit, the first relay driving circuit comprising a first enable input terminal and a first signal output terminal, the first enable input terminal being used to receive a relay enable signal, and the first signal output terminal being used to output a relay control signal; a second relay driving circuit, the second relay driving circuit comprising a second enable input terminal and a second signal output terminal, the second enable input terminal being used to receive a relay enable signal, the second signal output terminal being used to output a relay control signal, and a first OR gate circuit, wherein an input end of the first OR gate circuit is respectively connected to the first signal output end and the second signal output end, and an output end of the first OR gate circuit is used to be connected to the relay; The second enable input terminal is connected to the second signal output terminal to receive the relay control signal output by the second signal output terminal and use it as the relay enable signal.

2. The battery management system according to claim 1, characterized in that: The second enable input terminal is also connected to the first signal output terminal to receive the relay control signal output by the first signal output terminal and use it as the relay enable signal.

3. The battery management system according to claim 1 or 2, characterized in that: The second enable input is also connected to the first enable input such that one of the first enable input and the second enable input can be used to receive a relay enable signal provided to the other.

4. The battery management system according to claim 1 or 2, characterized in that: The first relay driving circuit and the second relay driving circuit are both low-side driving chips, and the relay control signal output by the first signal output terminal is a low level.

5. The battery management system according to claim 1 or 2, characterized in that: The first relay driving circuit and the second relay driving circuit are both high-side driving chips, and the relay control signal output by the first signal output terminal is a high level.

6. The battery management system according to claim 5, characterized in that: The relay control circuit further includes a third relay drive circuit, the third relay drive circuit includes a third enable input terminal and a third signal output terminal, the third enable input terminal is used to receive a relay enable signal, the third signal output terminal is used to output a relay control signal, and the third signal output terminal and the output terminal of the first OR gate circuit are respectively connected to two ends of the relay; Wherein, the third relay driving circuit is a low-side driving chip, and the relay control signal output by the third signal output terminal is a low level.

7. The battery management system according to claim 6, characterized in that: The relay control circuit further includes a fourth relay drive circuit, the fourth relay drive circuit includes a fourth enable input terminal and a fourth signal output terminal, the fourth enable input terminal is used to receive a relay enable signal, and the fourth signal output terminal is used to output a relay control signal; The relay control circuit further includes a second OR gate circuit, the input end of the second OR gate circuit is connected to the third signal output end and the fourth signal output end respectively, and the output end of the second OR gate circuit and the output end of the first OR gate circuit are connected to two ends of the relay respectively; Among them, the fourth relay driving circuit is a low-side driving chip, and the relay control signal output by the fourth signal output terminal is a low level.

8. The battery management system according to claim 7, characterized in that: The fourth enable input terminal is connected to the first signal output terminal to receive the relay control signal output by the first signal output terminal and use it as the relay enable signal.

9. The battery management system according to claim 7, characterized in that: The fourth enable input terminal is connected to the second signal output terminal to receive the relay control signal output by the second signal output terminal and use it as the relay enable signal.

10. The battery management system according to claim 7, characterized in that: The fourth enable input is connected to the third enable input such that one of the third enable input and the fourth enable input can be used to receive a relay enable signal provided to the other.

11. A battery device, characterized in that: Comprising a battery management system as described in any one of claims 1-10.

12. An electrical device, characterized in that: The electrical device comprises the battery device as claimed in claim 11.

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