Battery management system, battery device and electric device

Abstract

The utility model provides a battery management system, a battery device and a power utilization device, the battery management system comprises at least two protection circuits and a control circuit, the at least two protection circuits are connected with an output loop of the battery device, and the control circuit is connected with the at least two protection circuits respectively. And the control circuit is used for controlling one of the at least two protection circuits to work, and controlling the other one of the at least two protection circuits to work when one of the at least two protection circuits is damaged. The output loop of the battery device is protected through the protection circuit, and the situation that devices of the output loop are damaged is reduced; by arranging the at least two protection circuits, when one protection circuit is damaged, the other protection circuit is switched to work, the at least two protection circuits can be switched in time, the output loop is better protected, and the reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to a battery management system, a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] The battery of the electric vehicle provides electric energy for the electrical equipment of the electric vehicle through the output circuit. When the battery of the electric vehicle is connected with the electrical equipment of the electric vehicle, the output circuit of the battery device may generate overvoltage or overcurrent, which may damage the devices of the output circuit of the battery device. UTILITY MODEL CONTENT

[0004] The technical problem solved by the present application is to provide a battery management system, a battery device and a power utilization device, which can reduce damage to the output circuit through the protection circuit.

[0005] In a first aspect, the present application provides a battery management system, comprising at least two protection circuits and a control circuit, the at least two protection circuits being connected with an output circuit of a battery device, the control circuit being connected with the at least two protection circuits respectively, the control circuit being configured to control one of the at least two protection circuits to work, and to control another of the at least two protection circuits to work when one of the at least two protection circuits is damaged.

[0006] In the technical solution of the present application, the control circuit is configured to control one of the at least two protection circuits to work, so as to protect the output circuit of the battery device through the protection circuit and reduce the damage of the devices of the output circuit. In addition, the controller is configured to control another of the at least two protection circuits to work when one of the at least two protection circuits is damaged. By setting at least two protection circuits, another protection circuit is switched to work when one protection circuit is damaged, so as to timely switch the at least two protection circuits, better protect the output circuit and improve the reliability.

[0007] In some embodiments, the battery management system further comprises a sampling circuit, the sampling circuit being connected with the output circuit and the control circuit respectively, the control circuit being configured to acquire a sampling signal of the output circuit through the sampling circuit and confirm that one of the at least two protection circuits is damaged based on the sampling signal.

[0008] In the technical scheme of the embodiment of the application, the control circuit acquires the sampling signal of the output loop through the sampling circuit, and the sampling signal can be accurately acquired through the sampling circuit; the control circuit confirms that one of the at least two protection circuits is damaged based on the sampling signal, the damage of the protection circuit can be confirmed in time, the at least two protection circuits are switched in time, and the reliability is improved.

[0009] In some embodiments, the sampling signal includes a sampling voltage, and the control circuit is configured to confirm that one of the at least two protection circuits is damaged when the sampling voltage is less than a preset voltage and a maintaining duration of the sampling voltage is greater than a preset time.

[0010] In the technical scheme of the embodiment of the application, the damage of the protection circuit is confirmed by the sampling voltage being less than the preset voltage and the maintaining duration of the sampling voltage being greater than the preset time, the damage of the protection circuit can be confirmed in time through the sampling voltage, the at least two protection circuits are switched in time, and the reliability is improved.

[0011] In some embodiments, the sampling signal includes a sampling current, and the control circuit is configured to confirm that one of the at least two protection circuits is damaged when the sampling current is greater than a preset current and a maintaining duration of the sampling current is greater than a preset time.

[0012] In the technical scheme of the embodiment of the application, the damage of the protection circuit is confirmed by the sampling current being greater than the preset current and the maintaining duration of the sampling current being greater than the preset time, the damage of the protection circuit can be confirmed in time through the sampling current, the at least two protection circuits are switched in time, and the reliability is improved.

[0013] In some embodiments, each of the protection circuits includes a switching circuit and a protection device, the protection device is connected with the output loop through the switching circuit, the control circuit is connected with the switching circuit, and the control circuit is configured to control the switching circuit to be turned on so as to make the corresponding protection circuit work.

[0014] In the technical scheme of the embodiment of the application, the switching circuit is controlled to be turned on by the control circuit so as to make the corresponding protection circuit work, the switching circuit can be controlled by the control circuit to switch the at least two protection circuits, the implementation is easy, and the reliability is improved.

[0015] In some embodiments, the protection device includes a fuse, and the fuse is connected in series with the output loop through the switching circuit.

[0016] In the technical scheme of the embodiment of the application, the fuse is connected in series with the output loop through the switching circuit, and the fuse is fused in the case of overvoltage or overcurrent of the output loop, the output loop can be protected by the fuse, and the damage of the device of the output loop can be reduced.

[0017] In some embodiments, the protection device comprises a discharge tube, one end of the discharge tube is connected with the output circuit through the switch circuit, and the other end of the discharge tube is grounded.

[0018] In the technical scheme of the embodiments of the present application, the discharge tube grounds the output circuit in the case of overvoltage or overcurrent of the output circuit, so that the output circuit can be protected by the discharge tube, and the damage of the devices in the output circuit can be reduced.

[0019] In some embodiments, the switch circuit comprises a switch tube, a first end of the switch tube is connected with the output circuit, a second end of the switch tube is connected with the protection device, and a third end of the switch tube is connected with the control circuit.

[0020] In the technical scheme of the embodiments of the present application, the output circuit and the protection device are connected through the switch tube, and the voltage drop of the switch tube is small when it is turned on, so that the influence on the output circuit is reduced.

[0021] In some embodiments, the sampling circuit comprises an isolation chip and a plurality of sampling resistors, the plurality of sampling resistors are connected in series and connected with the output circuit, and the isolation chip is connected with the control circuit and one of the plurality of sampling resistors respectively, and is used to obtain the sampling signal of the output circuit.

[0022] In the technical scheme of the embodiments of the present application, the voltage is divided through the plurality of sampling circuits, the control circuit obtains the sampling signal by sampling one of the plurality of sampling resistors through the isolation chip, the control circuit can obtain the sampling signal in time, the damage of the protection circuit can be confirmed in time, and the reliability is improved.

[0023] In a second aspect, the present application provides a battery device comprising a battery and the battery management system, and the battery management system is connected with the output circuit of the battery device.

[0024] In a third aspect, the present application provides a power consumption device comprising the battery device, and the battery device is used to provide electric energy.

[0025] It can be understood that the beneficial effects of the above-mentioned second aspect to the third aspect can be referred to the related description in the first aspect, which will not be repeated here.

[0026] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 is a structural schematic diagram of an embodiment of the power utilization device provided by the present application;

[0029] Figure 2 is an exploded structural schematic diagram of an embodiment of the battery device provided by the present application;

[0030] Figure 3 is a framework schematic diagram of an embodiment of the battery management system provided by the present application;

[0031] Figure 4 is a framework schematic diagram of another embodiment of the battery management system provided by the present application;

[0032] Figure 5 is a circuit diagram of an embodiment of the battery management system provided by the present application;

[0033] Figure 6 is a circuit diagram of another embodiment of the battery management system provided by the present application.

[0034] The part labels in the detailed description of the embodiments are as follows:

[0035] Vehicle 1000, battery device 100, controller 200, motor 300, battery cell 400, battery box 500, first part 502, second part 503, third part 504, containing space 501, battery management system 10, at least two protection circuits 11, protection circuit 11a, protection circuit 11b, control circuit 12, output loop 20, sampling circuit 13, switch circuit 111, protection device 112, switch circuit 111a, protection device 112a, switch circuit 111b, protection device 112b, isolation chip 131, multiple sampling resistors 132, differential mode absorption loop 21, common mode absorption loop 22, microcontroller 121. Detailed description

[0036] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0038] 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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0039] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] 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, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0041] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application. The orientation or position of the device or element indicated, and therefore cannot be understood as limiting the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connect", "fix", and other terms should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0045] The battery of the electric vehicle can be a high-voltage battery. The battery of the electric vehicle is connected with a high-voltage wire harness, and the voltage of the high-voltage wire harness is equal to the voltage of the battery of the electric vehicle. The battery of the electric vehicle provides electric energy for the electrical equipment of the electric vehicle through an output circuit, wherein the output circuit can include a high-voltage wire harness, and the electrical equipment of the electric vehicle includes but is not limited to a storage battery, a generator, lighting equipment, an instrument device, or an auxiliary electric appliance, etc.

[0046] The input end of the electrical equipment of the electric vehicle is usually provided with an electromagnetic interference filter circuit, and the filter circuit has a large-capacity filter capacitor. When the battery of the electric vehicle is connected with the electrical equipment of the electric vehicle, a large instantaneous current is caused by the filter capacitor in the output circuit, so that the output circuit of the battery device produces overvoltage or overcurrent, which may damage the devices of the output circuit of the battery device.

[0047] Based on the above consideration, the present application provides a battery management system, a battery device and a power utilization device. The battery management system includes at least two protection circuits and a control circuit. The at least two protection circuits are connected with the output circuit of the battery device, and the control circuit is connected with the at least two protection circuits respectively. The control circuit is used to control one of the at least two protection circuits to work, and to control another of the at least two protection circuits to work when one of the at least two protection circuits is damaged. The control circuit is used to control one of the at least two protection circuits to work, and the output circuit of the battery device is protected by the protection circuit, so as to reduce the damage of the devices of the output circuit. In addition, the controller controls another of the at least two protection circuits to work when one of the at least two protection circuits is damaged. By setting at least two protection circuits, another protection circuit is switched to work when one protection circuit is damaged, so that the at least two protection circuits can be switched in time, the output circuit is better protected, and the reliability is improved.

[0048] The battery management system, the battery device and the power consumption device disclosed by the embodiments of the present application can be used in a power consumption device using the battery device as a power source or a variety of energy storage systems using the battery device as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0049] The following embodiments are described by taking a power consumption device of an embodiment of the present application as a vehicle 1000 for convenience of description.

[0050] Please refer to Figure 1 The vehicle 1000 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0051] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0052] In some embodiments, the battery device 100 can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0053] The battery device 100 mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers 400 to provide higher voltage and capacity.

[0054] In the embodiments of the present application, the battery device 100 can be a secondary battery, which refers to a battery that can be activated by charging after discharging to continue to use. The battery device 100 can also be a primary battery.

[0055] In some embodiments, the battery device 100 is a wound battery, for example, the battery device 100 can be a wound lithium-ion battery, a wound sodium-ion battery, a wound sodium-lithium-ion battery, a wound lithium-sulfur battery, a wound magnesium-ion battery, a wound nickel-hydrogen battery, a wound nickel-cadmium battery, a wound lead-acid battery, but not limited thereto.

[0056] In some embodiments, the battery device 100 can be a battery module, and when the battery monomer 400 is multiple, the multiple battery monomers 400 are arranged and fixed to form a battery module.

[0057] Please refer to Figure 2 , the battery device 100 can be a battery pack, the battery pack includes a battery box 500 and a battery monomer 400, and the battery monomer 400 or the battery module is contained in the battery box 500.

[0058] In some embodiments, the battery box 500 can be part of the chassis structure of the vehicle 1000. For example, part of the battery box 500 can be at least part of the floor of the vehicle 1000, or part of the battery box 500 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0059] The battery device 100 includes a battery box 500 and a battery monomer 400. The battery monomer 400 is contained in the battery box 500. Among them, the battery box 500 is formed with a containing space 501, and the battery monomer 400 is arranged in the containing space 501. The battery box 500 can adopt various structures.

[0060] In some embodiments, the battery box 500 can include a first part 502, a second part 503 and a third part 504, wherein the first part 502 can be a hollow structure with openings at both ends, the second part 503 can be a hollow structure with an opening at one end, and the third part 504 can also be a hollow structure with an opening at one end. The first part 502, the second part 503 and the third part 504 are covered with each other to jointly define a containing space 501 for containing the battery monomer 400. In some embodiments, the first part 502 forms the containing space 501, the first part 502 can be a hollow structure with openings at both ends, the second part 503 and the third part 504 are both plate structures, the second part 503 is covered with one opening of the first part 502, and the third part 504 is covered with the other opening of the first part 502 to close the containing space 501.

[0061] In some embodiments, the battery box 500 only includes the first part 502 and the second part 503. The first part 502 can be a hollow structure with one open end, and the second part 503 can be a plate structure. The second part 503 covers the open side of the first part 502, so that the first part 502 and the second part 503 together define the accommodation space 501. The first part 502 and the second part 503 can also be hollow structures with one open side. The open side of the first part 502 covers the open side of the second part 503. The battery box 500 can have various shapes, such as a cylinder, a cuboid, etc.

[0062] In the battery device 100, the battery cells 400 can be multiple. The multiple battery cells 400 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that some of the multiple battery cells 400 are connected in series and some are connected in parallel. The multiple battery cells 400 can be directly connected in series, in parallel, or in a mixed connection. The multiple battery cells 400 are accommodated in the battery box 500. Of course, the battery device 100 can also be that the multiple battery cells 400 are first connected in series, in parallel, or in a mixed connection to form a battery module. Multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the battery box 500. The battery device 100 can also include other structures. For example, the battery device 100 can also include a current combiner for realizing the electrical connection between the multiple battery cells 400.

[0063] According to some embodiments of the present application, please refer to Figure 3 as shown, Figure 3 is a framework schematic diagram of an embodiment of the battery management system provided by the present application. The battery management system (BMS) 10 includes at least two protection circuits 11 and a control circuit 12. The at least two protection circuits 11 can include a protection circuit 11a and a protection circuit 11b. In other embodiments, the at least two protection circuits 11 can include other numbers of protection circuits, such as three protection circuits, four protection circuits, or five protection circuits.

[0064] The battery management system 10 can be applied to the battery device 100. The battery management system 10 is used for signal detection and instruction control. For example, the battery management system 10 is arranged in the battery device 100.

[0065] The at least two protection circuits 11 are connected with the output loop 20 of the battery device 100. The control circuit 12 is connected with the at least two protection circuits 11 respectively. The control circuit 12 is used for controlling one protection circuit 11a in the at least two protection circuits 11 to work, and controlling another protection circuit 11b in the at least two protection circuits 11 to work when the one protection circuit 11a is damaged.

[0066] The output circuit 20 of the battery device 100 refers to a circuit for providing electric energy to other devices. For example, the output circuit 20 is a circuit for providing electric energy to electrical equipment (not shown in the figure) of the vehicle 1000; or the output circuit 20 is connected with a DCDC circuit (not shown in the figure) of the vehicle 1000, so as to provide electric energy to the electrical equipment through the DCDC circuit.

[0067] The at least two protection circuits 11 are connected with the output circuit 20 of the battery device 100; specifically, the at least two protection circuits 11 are connected in series with the output circuit 20; or one end of the at least two protection circuits 11 is connected with the output circuit 20.

[0068] The control circuit 12 is connected with the at least two protection circuits 11 respectively; specifically, the control circuit 12 is connected with the protection circuit 11a and the protection circuit 11b respectively, for controlling the protection circuit 11a and the protection circuit 11b.

[0069] In some embodiments, the control circuit 12 controls the protection circuit 11a to work, and controls the protection circuit 11b to stop working. At this time, the protection circuit 11a is in communication with the output circuit 20, so as to protect the output circuit 20 of the battery device 100 through the protection circuit 11a, and reduce the damage of the devices on the output circuit 20.

[0070] The control circuit 12 controls the other protection circuit 11b in the at least two protection circuits 11 to work when one protection circuit 11a in the at least two protection circuits 11 is damaged. At this time, the protection circuit 11b is in communication with the output circuit 20, so as to protect the output circuit 20 of the battery device 100 through the protection circuit 11b; the other protection circuit 11b is switched to work when the protection circuit 11a is damaged, so as to timely switch the at least two protection circuits 11, better protect the output circuit 20, and improve the reliability.

[0071] In some embodiments, when the control circuit 12 controls the protection circuit 11b to work, the control circuit 12 controls the protection circuit 11a to stop working. At this time, the protection circuit 11b is in communication with the output circuit 20, so as to protect the output circuit 20 of the battery device 100 through the protection circuit 11b, and reduce the damage of the devices on the output circuit 20.

[0072] The control circuit 12 controls the other protection circuit 11a of the at least two protection circuits 11 to work when one protection circuit 11b of the at least two protection circuits 11 is damaged. At this time, the protection circuit 11a is in communication with the output loop 20 to protect the output loop 20 of the battery device 100 through the protection circuit 11a; the other protection circuit 11a is switched to work when the protection circuit 11b is damaged, so that the at least two protection circuits 11 can be switched in time, the output loop 20 is better protected, and the reliability is improved.

[0073] According to some embodiments of the present application, as shown in Figure 3 The battery management system 10 further includes a sampling circuit 13, which is connected with the output loop 20 and the control circuit 12 respectively.

[0074] The sampling circuit 13 is connected with the output loop 20 and is used to sample the output loop 20 to obtain a sampling signal.

[0075] The control circuit 12 obtains the sampling signal of the output loop 20 through the sampling circuit 13, and confirms that one protection circuit 11a of the at least two protection circuits 11 is damaged based on the sampling signal. For example, the control circuit 12 confirms that the protection circuit 11a is damaged based on the sampling signal; or the control circuit 12 confirms that the protection circuit 11b is damaged based on the sampling signal.

[0076] The control circuit 12 of the present application obtains the sampling signal of the output loop 20 through the sampling circuit 13, which can accurately obtain the sampling signal through the sampling circuit 13; the control circuit 12 confirms that one protection circuit 11a of the at least two protection circuits 11 is damaged based on the sampling signal, which can timely confirm that the protection circuit 11a is damaged, timely switch the at least two protection circuits 11, and improve the reliability.

[0077] According to some embodiments of the present application, the sampling signal includes a sampling voltage, that is, the sampling circuit 13 samples the voltage of the output loop 20, and the control circuit 12 compares the sampling voltage with a preset voltage, wherein the control circuit 12 is previously provided with the preset voltage.

[0078] Optionally, the sampling circuit 13 is used to sample the output loop 20 to obtain a first sampling voltage when the protection circuit 11a or the protection circuit 11b is not damaged, and to obtain a second sampling voltage when the protection circuit 11a or the protection circuit 11b is damaged, and the control circuit 12 sets the preset voltage based on the first sampling voltage and the second sampling voltage.

[0079] The control circuit 12 is used to control the protection circuit 11a or the protection circuit 11b to maintain in the working state when the sampling voltage is greater than or equal to the preset voltage, without switching the at least two protection circuits 11.

[0080] The control circuit 12 is configured to obtain a maintaining time of the sampling voltage when the sampling voltage is less than the preset voltage, and compare the maintaining time of the sampling voltage with a preset time, wherein the control circuit 12 is previously provided with the preset time; for example, the control circuit 12 can be previously provided with the preset time based on a historical preset time, or the preset time is previously provided by a user through the control circuit 12.

[0081] The control circuit 12 is configured to determine that the output loop 20 has an overcurrent or overvoltage condition when the maintaining time of the sampling voltage is less than or equal to the preset time, record the sampling voltage and time information corresponding to the sampling voltage, so as to facilitate the control circuit 12 to analyze and process based on the sampling voltage and the time information.

[0082] The control circuit 12 is configured to determine that the protection circuit 11a or the protection circuit 11b is damaged when the maintaining time of the sampling voltage is greater than the preset time. When the control circuit 12 determines that the protection circuit 11a is damaged, the control circuit 12 controls the protection circuit 11b to work, so as to realize switching from the protection circuit 11a to the protection circuit 11b. When the control circuit 12 determines that the protection circuit 11b is damaged, the control circuit 12 controls the protection circuit 11a to work, so as to realize switching from the protection circuit 11b to the protection circuit 11a.

[0083] The application can determine that the protection circuit 11a or the protection circuit 11b is damaged in time through the sampling voltage when the sampling voltage is less than the preset voltage and the maintaining time of the sampling voltage is greater than the preset time, and then switch the at least two protection circuits 11 in time, thereby improving the reliability.

[0084] According to some embodiments of the application, the sampling signal includes a sampling current, i.e., the sampling circuit 13 samples the current of the output loop 20, and the control circuit 12 compares the sampling current with a preset current, wherein the control circuit 12 is previously provided with the preset current.

[0085] The control circuit 12 is configured to control the protection circuit 11a or the protection circuit 11b to maintain in a working state when the sampling current is less than or equal to the preset current, without switching the at least two protection circuits 11.

[0086] The control circuit 12 is configured to obtain a maintaining time of the sampling current when the sampling current is greater than the preset current, and compare the maintaining time of the sampling current with a preset time, wherein the control circuit 12 is previously provided with the preset time; for example, the control circuit 12 can be previously provided with the preset time based on a historical preset time, or the preset time is previously provided by a user through the control circuit 12.

[0087] The control circuit 12 is configured to determine that overcurrent or overvoltage occurs in the output loop 20 when the maintaining time of the sampled current is less than or equal to the preset time, record the sampled current and time information corresponding to the sampled current, and facilitate the control circuit 12 to analyze and process based on the sampled current and the time information.

[0088] The control circuit 12 is configured to determine that the protection circuit 11a or the protection circuit 11b is damaged when the maintaining time of the sampled current is greater than the preset time. When the control circuit 12 determines that the protection circuit 11a is damaged, the control circuit 12 controls the protection circuit 11b to work, so as to switch from the protection circuit 11a to the protection circuit 11b. When the control circuit 12 determines that the protection circuit 11b is damaged, the control circuit 12 controls the protection circuit 11a to work, so as to switch from the protection circuit 11b to the protection circuit 11a.

[0089] The application can determine that the protection circuit 11a or the protection circuit 11b is damaged in time through the sampled current, and then switch at least two protection circuits 11 in time, thereby improving the reliability.

[0090] According to some embodiments of the application, please refer to Figure 4 Figure 4 is a schematic diagram of another embodiment of the battery management system provided by the application. In at least two protection circuits 11, each protection circuit includes a switching circuit 111 and a protection device 112, that is, the protection circuit 11a includes a switching circuit 111a and a protection device 112a, and the protection circuit 11b includes a switching circuit 111b and a protection device 112b.

[0091] The protection device 112 is connected to the output loop 20 through the switching circuit 111, and the control circuit 12 is connected to the switching circuit 111. The control circuit 12 is configured to control the switching circuit 111 to be turned on, so as to make the corresponding protection circuit work.

[0092] In some embodiments, the protection device 112a is connected to the output loop 20 through the switching circuit 111a, and the control circuit 12 is connected to the switching circuit 111a. The control circuit 12 is configured to control the switching circuit 111a to be turned on, so as to make the corresponding protection circuit 11a work. The control circuit 12 is further configured to control the switching circuit 111a to be turned off, so as to make the corresponding protection circuit 11a stop working.

[0093] ​In some embodiments, the protection device 112b is connected with the output circuit 20 through the switch circuit 111b, the control circuit 12 is connected with the switch circuit 111b, and the control circuit 12 is configured to control the switch circuit 111b to be turned on so as to enable the corresponding protection circuit 11b to work. The control circuit 12 is further configured to control the switch circuit 111b to be turned off so as to disable the corresponding protection circuit 11b to work.

[0094] The application can control the switch circuit 111 to switch at least two protection circuits 11 by the control circuit 12, which is easy to implement and improves reliability.

[0095] According to some embodiments of the application, please refer to Figure 5 as shown, Figure 5 is a circuit diagram of an embodiment of the battery management system provided by the application. The protection device 112 includes a fuse, and the fuse is connected in series with the output circuit 20 through the switch circuit 111. The fuse includes but is not limited to a fuse wire.

[0096] The protection device 111a includes a fuse, the protection device 111b includes a fuse, and the fuse of the protection device 111a and the fuse of the protection device 111b are the same. The fuse of the protection device 111a is connected in series with the output circuit 20 through the switch circuit 111a, and the fuse of the protection device 111b is connected in series with the output circuit 20 through the switch circuit 111b.

[0097] The fuse of the application is connected in series with the output circuit 20 through the switch circuit 111, and the fuse is fused in the case of overvoltage or overcurrent of the output circuit 20, which can protect the output circuit 20 by the fuse and reduce the damage of the devices of the output circuit 20.

[0098] According to some embodiments of the application, please refer to Figure 6 as shown, Figure 6 is a circuit diagram of another embodiment of the battery management system provided by the application. The protection device 112 includes a discharge tube, one end of the discharge tube is connected with the output circuit 20 through the switch circuit 111, and the other end of the discharge tube is grounded.

[0099] The protection device 112a includes a discharge tube, one end of the discharge tube of the protection device 112a is connected with the output circuit 20 through the switch circuit 111a, and the other end of the discharge tube of the protection device 112a is grounded. The protection device 112b includes a discharge tube, one end of the discharge tube of the protection device 112b is connected with the output circuit 20 through the switch circuit 111b, and the other end of the discharge tube of the protection device 112b is grounded. The discharge tube of the protection device 112a and the discharge tube of the protection device 112b are the same.

[0100] The discharge tube of the application grounds the output loop 20 in the case of over-voltage or over-current of the output loop 20, can protect the output loop 20 by the discharge tube, and reduces the damage of the device of the output loop 20.

[0101] According to some embodiments of the application, as shown in Figure 5 or Figure 6 The switch circuit 111 includes a switch tube, the first end of the switch tube is connected with the output loop 20, the second end of the switch tube is connected with the protection device 112, and the third end of the switch tube is connected with the control circuit 12.

[0102] The switch circuit 111a includes a switch tube Q1, the first end of the switch tube Q1 is connected with the output loop 20, the second end of the switch tube Q1 is connected with the protection device 112, and the third end of the switch tube Q1 is connected with the control circuit 12. The switch circuit 111b includes a switch tube Q2, the first end of the switch tube Q2 is connected with the output loop 20, the second end of the switch tube Q2 is connected with the protection device 112, and the third end of the switch tube Q2 is connected with the control circuit 12.

[0103] Optionally, the switch tube Q1 and the switch tube Q2 are both Insulated Gate Bipolar Transistors (IGBTs), the first end of the switch tube Q1 is the collector of the switch tube Q1, the second end of the switch tube Q1 is the emitter of the switch tube Q1, and the third end of the switch tube Q1 is the base of the switch tube Q1.

[0104] The application connects the output loop 20 and the protection device 112 through the switch tube, and the voltage drop of the switch tube is small in the on state, thereby reducing the influence on the output loop 20.

[0105] According to some embodiments of the application, as shown in Figure 5 or Figure 6 The sampling circuit 13 includes an isolation chip 131 and a plurality of sampling resistors 132, the plurality of sampling resistors 132 are connected in series and connected with the output loop 20; the isolation chip 131 is connected with the control circuit 12 and one of the plurality of sampling resistors 132 respectively, and is used for acquiring a sampling signal of the output loop 20. The sampling signal includes but is not limited to a sampling voltage or a sampling current.

[0106] The application divides voltage through the plurality of sampling resistors 132, the control circuit 12 samples one of the sampling resistors through the isolation chip 131 to obtain the sampling signal, the control circuit 12 can obtain the sampling signal in time, can confirm the damage of the protection circuit 11a or the protection circuit 11b in time, and improves the reliability.

[0107] In some embodiments, as shown in Figure 5As shown, the output circuit 20 includes a differential mode absorption circuit 21 and a common mode absorption circuit 22, the differential mode absorption circuit 21 including a resistor R1, a resistor R2, a resistor R3, a resistor R4, an inductor L1, and a capacitor C1, and the common mode absorption circuit 22 including a capacitor C2, a capacitor C3, and an inductor L2.

[0108] The first output end of all the battery cells 400 of the battery device 100 is connected to the first end of the inductor L1 and the inductor L2 through the resistor R1, and the second output end of the battery cells 400 is connected to the second end of the inductor L2; one end of the capacitor C1 is connected to the first output end of the battery cells 400, one end of the capacitor C2 is connected to the second output end of the battery cells 400, and the other end of the capacitor C1 and the other end of the capacitor C2 are grounded. The resistor R2, the resistor R3, and the resistor R4 are connected in series between the third end and the fourth end of the inductor L2, one end of the capacitor C1 is connected to the third end of the inductor L2, and the other end of the capacitor C1 is connected to the fourth end of the inductor L2.

[0109] The control circuit 12 includes a micro control unit (MCU) 121, a switch tube Q3, a switch tube Q4, a resistor R5, a resistor R6, a resistor R7, and a resistor R8, the first end of the micro control unit 121 is connected to the third end of the switch tube Q3, the first end of the switch tube Q3 receives a reference voltage VCC through the resistor R5, and the second end of the switch tube Q3 is grounded through the resistor R6; the second end of the micro control unit 121 is connected to the third end of the switch tube Q4, the first end of the switch tube Q4 receives the reference voltage VCC through the resistor R7, and the second end of the switch tube Q4 is grounded through the resistor R8.

[0110] Optionally, the switch tube Q3 and the switch tube Q4 are N-type MOS tubes. In other embodiments, the switch tube Q3 and the switch tube Q4 can also be other types of switch tubes, which are not described herein again. The third end of the switch tube Q3 is the gate of the MOS tube, the first end of the switch tube Q3 is the drain of the MOS tube, and the second end of the switch tube Q3 is the source of the MOS tube.

[0111] The first end of the switch tube Q1 and the first end of the switch tube Q2 are both connected to the first output end of the battery cells 400, the second end of the switch tube Q1 is connected to the resistor R1 through the protection device 112a, the second end of the switch tube Q2 is connected to the resistor R1 through the protection device 112b, the third end of the switch tube Q1 is connected between the switch tube Q3 and the resistor R5, and the third end of the switch tube Q2 is connected between the switch tube Q4 and the resistor R7.

[0112] The plurality of sampling resistors 132 include resistor R9, resistor R10, resistor R11, resistor R12, and resistor R13. One end of resistor R9 is connected to resistor R1, and the other end of resistor R9 is connected to the second output end of battery cell 400 through resistor R11, resistor R12, and resistor R13. Isolation chip 131 is connected to microcontroller 121 and resistor R13, respectively. Microcontroller 121 obtains the voltage division value of resistor R13 through isolation chip 131, and further obtains the sampling voltage of output loop 20.

[0113] Microcontroller 121 controls switch tube Q1 to be turned on through switch tube Q3 and controls switch tube Q2 to be turned off through switch tube Q4. At this time, protection device 112a is connected between the first output end of battery cell 400 and resistor R1 through switch tube Q1. Protection device 112a is a fuse, which is blown in the case of overvoltage or overcurrent of output loop 20, so as to protect the devices of output loop 20.

[0114] Microcontroller 121 determines that protection device 112a is damaged when the sampling voltage is less than the preset voltage and the maintenance duration of the sampling voltage is greater than the preset time, controls switch tube Q2 to be turned on through switch tube Q4, and controls switch tube Q1 to be turned off through switch tube Q3. At this time, protection device 112b is connected between the first output end of battery cell 400 and resistor R1 through switch tube Q2. Microcontroller 121 determines that protection circuit 11a is damaged when the sampling voltage is less than the preset voltage and the maintenance duration of the sampling voltage is greater than the preset time, which can timely confirm the damage of protection circuit 11a and timely switch at least two protection circuits 11, thereby improving the reliability.

[0115] In some embodiments, as shown in FIG. 1, Figure 6 Output loop 20 includes differential mode absorption loop 21 and common mode absorption loop 22. Differential mode absorption loop 21 includes resistor R1, resistor R2, resistor R3, resistor R4, inductor L1, and capacitor C1. Common mode absorption loop 22 includes capacitor C2, capacitor C3, and inductor L2.

[0116] The first output end of battery cell 400 is connected to the first end of inductor L2 through resistor R1 and inductor L1, and the second output end of battery cell 400 is connected to the second end of inductor L2. One end of capacitor C1 is connected to the first output end of battery cell 400, one end of capacitor C2 is connected to the second output end of battery cell 400, and the other end of capacitor C1 and the other end of capacitor C2 are grounded. Resistor R2, resistor R3, and resistor R4 are connected in series between the third end and the fourth end of inductor L2. One end of capacitor C1 is connected to the third end of inductor L2, and the other end of capacitor C1 is connected to the fourth end of inductor L2.

[0117] The control circuit 12 comprises a microcontroller 121, a switch tube Q3, a switch tube Q4, a resistor R5, a resistor R6, a resistor R7 and a resistor R8, a first end of the microcontroller 121 is connected with a third end of the switch tube Q3, a first end of the switch tube Q3 receives a reference voltage VCC through the resistor R5, and a second end of the switch tube Q3 is grounded through the resistor R6; a second end of the microcontroller 121 is connected with a third end of the switch tube Q4, a first end of the switch tube Q4 receives the reference voltage VCC through the resistor R7, and a second end of the switch tube Q4 is grounded through the resistor R8.

[0118] The output circuit 20 further comprises a resistor R14 and a resistor R15, one end of the resistor R14 is connected with a first output end of the battery monomer 400, and the other end of the resistor R14 is connected with a second output end of the battery monomer 400 through the resistor R15.

[0119] The first end of the switch tube Q1 and the first end of the switch tube Q2 are both connected between the resistor R14 and the resistor R15, a second end of the switch tube Q1 is grounded through the protection device 112a, a second end of the switch tube Q2 is grounded through the protection device 112, a third end of the switch tube Q1 is connected between the switch tube Q3 and the resistor R5, and a third end of the switch tube Q2 is connected between the switch tube Q4 and the resistor R7.

[0120] The plurality of sampling resistors 132 comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12 and a resistor R13, one end of the resistor R9 is connected between the resistor R14 and the resistor R15, and the other end of the resistor R9 is connected with the second output end of the battery monomer 400 through the resistor R11, the resistor R12 and the resistor R13. The isolation chip 131 is connected with the microcontroller 121 and the resistor R13 respectively, the microcontroller 121 obtains a voltage division value of the resistor R13 through the isolation chip 131, and further obtains a sampling voltage of the output circuit 20.

[0121] The microcontroller 121 controls the switch tube Q1 to be turned on through the switch tube Q3 and controls the switch tube Q2 to be turned off through the switch tube Q4; at this time, the protection device 112a is connected between the resistor R14 and the resistor R15 through the switch tube Q1. The protection device 112a is a discharge tube, and in the case that the output circuit 20 is overvoltage or overcurrent, the output circuit 20 is grounded through the discharge tube to protect the devices of the output circuit 20.

[0122] When the sampling voltage is less than the preset voltage and the maintaining time of the sampling voltage is greater than the preset time, the microcontroller 121 judges that the protection device 112a is damaged, controls the switch tube Q2 to be turned on through the switch tube Q4, and controls the switch tube Q1 to be turned off through the switch tube Q3; at this time, the protection device 112b is connected between the resistor R13 and the resistor R14 through the switch tube Q2. When the sampling voltage is less than the preset voltage and the maintaining time of the sampling voltage is greater than the preset time, the microcontroller 121 determines that the protection circuit 11a is damaged, can timely confirm that the protection circuit 11a is damaged, timely switches at least two protection circuits 11, and improves the reliability.

[0123] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; 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 be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery management system, characterized by, The battery management system comprises at least two protection circuits connected with an output circuit of a battery device and a control circuit connected with the at least two protection circuits respectively, the control circuit being configured to control one of the at least two protection circuits to work and control another of the at least two protection circuits to work when the one of the at least two protection circuits is damaged.

2. The battery management system of claim 1, wherein, The battery management system further comprises a sampling circuit connected with the output circuit and the control circuit respectively, the control circuit being configured to acquire a sampling signal of the output circuit through the sampling circuit and confirm that one of the at least two protection circuits is damaged based on the sampling signal.

3. The battery management system of claim 2, wherein, The sampling signal comprises a sampling voltage, and the control circuit is configured to confirm that one of the at least two protection circuits is damaged when the sampling voltage is less than a preset voltage and a maintaining duration of the sampling voltage is greater than a preset time.

4. The battery management system of claim 2, wherein, The sampling signal comprises a sampling current, and the control circuit is configured to confirm that one of the at least two protection circuits is damaged when the sampling current is greater than a preset current and a maintaining duration of the sampling current is greater than a preset time.

5. The battery management system of any one of claims 1-4, wherein, Each of the protection circuits comprises a switch circuit and a protection device connected with the output circuit through the switch circuit, and the control circuit is connected with the switch circuit and configured to control the switch circuit to be turned on so as to make the corresponding protection circuit work.

6. The battery management system of claim 5, wherein, The protection device comprises a fuse connected with the output circuit in series through the switch circuit.

7. The battery management system of claim 5, wherein, The protection device comprises a discharge tube, one end of the discharge tube being connected with the output circuit through the switch circuit and the other end of the discharge tube being grounded.

8. The battery management system of claim 5, wherein, The switch circuit comprises a switch tube, a first end of the switch tube being connected with the output circuit, a second end of the switch tube being connected with the protection device, and a third end of the switch tube being connected with the control circuit.

9. The battery management system of any one of claims 2-4, wherein, The sampling circuit comprises an isolation chip and a plurality of sampling resistors connected in series and connected with the output circuit, and the isolation chip is connected with the control circuit and one of the plurality of sampling resistors respectively and configured to acquire the sampling signal of the output circuit.

10. A battery device characterized by comprising: The battery management system comprises an output circuit and the battery management system according to any one of claims 1-9, the battery management system being connected with the output circuit.

11. An electrical device, characterized by The battery device according to claim 10 is configured to provide electric energy.

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