Detection circuit of battery heating circuit, battery heating assembly, circuit breaking detection method and system

Abstract

The application provides a battery heating circuit detection circuit, a battery heating assembly, a circuit breaking detection method and system, and belongs to the technical field of batteries. The detection circuit comprises a first voltage detection branch, a second voltage detection branch and a third voltage detection branch. The first voltage detection branch comprises a first detection switch and a first sampling resistor connected in series, and is used for detecting a first voltage between a positive electrode of a power supply and a second connection end. The second voltage detection branch comprises a second detection switch and a second sampling resistor connected in series, and is used for detecting a second voltage between a negative electrode of the power supply and a first connection end. The third voltage detection branch comprises a third detection switch and a third sampling resistor connected in series, and is used for detecting a third voltage between the third connection end and the positive electrode of the power supply or between the third connection end and the negative electrode of the power supply. In this way, circuit breaking detection in the working state and the non-working state of the heating component can be realized, and the detection circuit breaking part can be more accurate.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a detection circuit for a battery heating circuit, a battery heating component, an open circuit detection method, and a system. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In low-temperature environments, battery performance is significantly affected. As an important auxiliary device for improving battery performance in low-temperature environments, the proper functioning of the heating component is crucial for maintaining the battery temperature within a reasonable range. Therefore, how to detect whether the battery heating component is faulty is an urgent problem to be solved. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the background art. Therefore, one object of this application is to provide a detection circuit for a battery heating circuit, a battery heating component, an open circuit detection method, and a system, so as to realize the detection of battery heating components and improve detection accuracy and efficiency.

[0005] An embodiment of the first aspect of this application provides a detection circuit for a battery heating circuit. The battery heating circuit includes a first heating switch, a heating element, and a second heating switch connected in series. The heating element has a first connection terminal, a second connection terminal, and a third connection terminal located between the first and second connection terminals. The heating element includes a first heating portion located between the first and third connection terminals, and a second heating portion located between the third and second connection terminals. The first connection terminal is electrically connected to the positive terminal of a power source via the first heating switch, and the second connection terminal is electrically connected to the negative terminal of the power source via the second heating switch.

[0006] The detection circuit includes a first voltage detection branch, a second voltage detection branch, and a third voltage detection branch. The first voltage detection branch includes a first detection switch and a first sampling resistor connected in series. The first terminal of the first voltage detection branch is electrically connected to the positive terminal of the power supply, and the second terminal of the first voltage detection branch is electrically connected to a second connection terminal. The first voltage detection branch is used to detect a first voltage between the positive terminal of the power supply and the second connection terminal. The second voltage detection branch includes a second detection switch and a second sampling resistor connected in series. The first terminal of the second voltage detection branch is electrically connected to the negative terminal of the power supply, and the second terminal of the second voltage detection branch is electrically connected to the first connection terminal. The second voltage detection branch is used to detect a second voltage between the negative terminal of the power supply and the first connection terminal. The third voltage detection branch includes a third detection switch and a third sampling resistor connected in series. The first terminal of the third voltage detection branch is electrically connected to either the positive or negative terminal of the power supply, and the second terminal of the third voltage detection branch is electrically connected to the third connection terminal. The third voltage detection branch is used to detect a third voltage between the third connection terminal and either the positive or negative terminal of the power supply.

[0007] In the technical solution of this application embodiment, the third voltage detection branch can be used to detect the third voltage between the third connection terminal and the positive terminal of the power supply or between the third connection terminal and the negative terminal of the power supply. It can realize the open circuit detection when the heating component is in the working state and the non-working state, and thus determine the location of the open circuit fault in the battery heating circuit, so that the detection of the open circuit can be more accurate. At the same time, the detection results can be verified in a variety of ways through the first voltage, the second voltage and the third voltage, further improving the detection accuracy and detection efficiency, which is conducive to fault diagnosis and replacement of faulty components.

[0008] In some embodiments, there are multiple heating elements connected in parallel; and a third voltage detection branch is configured to detect the third voltage between the positive terminal of the power supply and the third connection terminal of any one of the multiple heating elements, or between the negative terminal of the power supply and the third connection terminal of any one of the multiple heating elements. The third voltage detection branch can detect the third voltage of multiple heating elements, thereby determining whether a heating element between its third connection terminal and the positive terminal of the power supply or between its third connection terminal and the negative terminal of the power supply is faulty, thus improving detection efficiency and reducing detection time.

[0009] In some embodiments, there are multiple third voltage detection branches, each connected to a third connection terminal of a plurality of heating components. By detecting the third voltage of the plurality of heating components through multiple third voltage detection branches, it is possible to determine whether an open circuit has occurred in the plurality of heating components, thereby improving detection efficiency.

[0010] In some embodiments, the third voltage detection branch includes multiple third detection switches connected in parallel. The first terminals of the multiple third detection switches are connected to the third sampling resistor, and the second terminals of the multiple third detection switches are connected one-to-one with the third connection terminals of the multiple heating components. By setting the first terminals of the multiple third detection switches to be connected to the third sampling resistor, and the second terminals of the multiple third detection switches to be connected one-to-one with the third connection terminals of the multiple heating components, the third sampling resistor can be universally used. This avoids the need to add a complete third voltage detection branch for detection for each additional heating component, thereby reducing the possibility of redundant third sampling resistor settings and improving detection efficiency.

[0011] In some embodiments, the detection circuit includes a processor connected to a first voltage detection branch, a second voltage detection branch, and a third voltage detection branch. The processor is configured to determine the open-circuit detection result of the battery heating circuit based on at least one of the first voltage, the second voltage, and the third voltage. The processor enables open-circuit detection of the battery heating circuit, achieving efficient detection with high stability and reliability of the detection results.

[0012] An embodiment of the second aspect of this application provides a battery heating assembly, which includes a battery heating circuit. The battery heating circuit includes a first heating switch, a heating element, and a second heating switch connected in series. The heating element has a first connection terminal, a second connection terminal, and a third connection terminal located between the first and second connection terminals. The heating element includes a first heating portion located between the first and third connection terminals, and a second heating portion located between the third and second connection terminals. The first connection terminal is electrically connected to the positive terminal of a power supply through the first heating switch, and the second connection terminal is electrically connected to the negative terminal of the power supply through the second heating switch. The battery heating assembly also includes a detection circuit as described in the foregoing embodiment, which is used to detect an open circuit in the heating element of the battery heating circuit.

[0013] In some embodiments, the battery heating circuit includes multiple heating elements and multiple third heating switches. Any one of the heating elements is connected in series with a third heating switch and then connected in parallel with the other heating elements. A first voltage detection branch is configured to detect the voltage between the positive terminal of the power supply and a second connection terminal of any one of the heating elements; a second voltage detection branch is configured to detect the voltage between the negative terminal of the power supply and a first connection terminal of any one of the heating elements; and a third voltage detection branch is configured to detect the voltage between the positive terminal of the power supply and a third connection terminal of any one of the heating elements, or the voltage between the negative terminal of the power supply and a third connection terminal of any one of the heating elements. By controlling the third heating switches to switch the operating conditions of the heating elements and to detect the first, second, and third voltages, it is beneficial to determine whether an open circuit has occurred in the battery heating circuit, thereby improving fault detection efficiency.

[0014] In some embodiments, multiple battery heating circuits are connected in parallel between the positive and negative terminals of a power source. A first voltage detection branch is configured to detect a first voltage between the positive terminal of the power source and a second connection terminal of any one of the multiple battery heating circuits. A second voltage detection branch is configured to detect a second voltage between the negative terminal of the power source and a first connection terminal of any one of the multiple battery heating circuits. A third voltage detection branch is configured to detect a third voltage between the positive terminal of the power source and a third connection terminal of any one of the multiple battery heating circuits, or between the negative terminal of the power source and a third connection terminal of any one of the multiple heating circuits. Using the first, second, and third voltage detection branches enables the detection of multiple battery heating circuits, thereby determining the power-off position of the battery heating circuits and improving detection efficiency.

[0015] In some embodiments, there are multiple detection circuits, each connected to a corresponding battery heating circuit. This correspondence between the detection circuits and the multiple battery heating circuits improves detection accuracy, thereby facilitating fault diagnosis and enhancing detection reliability.

[0016] In some embodiments, the first voltage detection branch includes a plurality of first detection switches connected in parallel, the first terminals of the plurality of first detection switches being connected to a first sampling resistor, and the second terminals of the plurality of first detection switches being connected one-to-one with the second connection terminals of the plurality of battery heating circuits, or the second terminals of the plurality of first detection switches being connected to the positive terminal of the power supply; the second voltage detection branch includes a plurality of second detection switches connected in parallel, the first terminals of the plurality of second detection switches being connected to a second sampling resistor, and the second terminals of the plurality of second detection switches being connected one-to-one with the first connection terminals of the plurality of battery heating circuits, or the second terminals of the plurality of second detection switches being connected to the negative terminal of the power supply; the third voltage detection branch includes a plurality of third detection switches connected in parallel, the first terminals of the plurality of third detection switches being connected to a third sampling resistor, and the second terminals of the plurality of third detection switches being connected one-to-one with the third connection terminals of the plurality of battery heating circuits, or the second terminals of the plurality of third detection switches being connected to the positive terminal of the power supply, or the second terminals of the plurality of third detection switches being connected to the negative terminal of the power supply. This allows for the universality of the first, second, and third sampling resistors, avoiding the need to add a complete first, second, and third voltage detection branch for each additional battery heating circuit. This reduces redundant resistor settings and improves detection efficiency.

[0017] In some embodiments, the battery heating assembly further includes a controller, which is signal-connected to both the battery heating circuit and the detection circuit. The controller is configured to control the battery heating circuit to heat the battery and to control the detection circuit to perform open-circuit detection on the battery heating circuit. By setting the controller, precise control of the battery heating circuit and the detection circuit can be achieved, and signals from the first voltage, the second voltage, and the third voltage can be collected to determine the fault location of the battery heating circuit, thereby improving the reliability and accuracy of detection.

[0018] An embodiment of the third aspect of this application provides an open circuit detection method, applied to a detection circuit or a battery heating assembly as described in the foregoing embodiments. The open circuit detection method includes: connecting one of a first voltage detection branch and a second voltage detection branch, a heating component, a third voltage detection branch, and a power supply to form a first circuit; acquiring a third voltage across the third voltage detection branch; and determining the open circuit detection result of the battery heating circuit based at least on the third voltage. This allows for the determination of the open circuit detection result of the battery heating circuit based at least on the third voltage, thereby confirming the location of the break point and facilitating fault diagnosis.

[0019] In some embodiments, connecting one of the first voltage detection branch and the second voltage detection branch, the heating component, the third voltage detection branch, and the power supply to form a first circuit includes: controlling the second detection switch and the third detection switch to close when the first terminal of the third sampling resistor is electrically connected to the positive terminal of the power supply; and wherein determining the open circuit detection result of the battery heating circuit based at least on the third voltage includes: determining that the first heating part of the heating component is open-circuited in response to the third voltage being less than or equal to a first threshold; or controlling the first detection switch and the third detection switch to close when the first terminal of the third sampling resistor is electrically connected to the negative terminal of the power supply; and wherein determining the open circuit detection result of the battery heating circuit based at least on the third voltage includes: determining that the second heating part of the heating component is open-circuited in response to the third voltage being less than or equal to the first threshold. The location of the break point in the heating component can be determined based on the third voltage, which is beneficial for detecting open circuit faults and replacing faulty components, improving the effectiveness and reliability of fault detection.

[0020] In some embodiments, the open circuit detection method further includes: connecting one of the first heating switch and the second heating switch, the heating component, and the third voltage detection branch to a power supply to form a second circuit; acquiring the third voltage across the third voltage detection branch again; and determining the open circuit detection result of the heating component based at least on the acquired third voltage. This allows the open circuit detection result of the battery heating circuit to be determined based at least on the third voltage, thereby confirming the location of the break point and facilitating fault diagnosis.

[0021] In some embodiments, connecting one of the first and second heating switches, the heating element, and the third voltage detection branch to a power supply to form a second circuit includes: controlling the second heating switch and the third detection switch to close when the first terminal of the third sampling resistor is electrically connected to the positive terminal of the power supply; and wherein determining the open circuit detection result of the battery heating circuit based at least on the re-acquired third voltage includes: determining that the second heating element has been open-circuited in response to the re-acquired third voltage being less than or equal to a first threshold; or controlling the first heating switch and the third detection switch to close when the first terminal of the third sampling resistor is electrically connected to the negative terminal of the power supply; and wherein determining the open circuit detection result of the battery heating circuit based at least on the re-acquired third voltage includes: determining that the first heating element has been open-circuited in response to the re-acquired third voltage being less than or equal to the first threshold. The location of the break point in the heating element can be determined based on the third voltage, which facilitates limiting the fault range to the first or second heating element, and is beneficial for realizing open circuit fault detection and replacing faulty components, thereby improving the effectiveness and reliability of fault detection.

[0022] In some embodiments, the open circuit detection method further includes: connecting a first voltage detection branch, a heating component, and a second voltage detection branch to a power supply to form a third circuit; and acquiring a first voltage across the first voltage detection branch and / or a second voltage across the second voltage detection branch; wherein determining the open circuit detection result of the battery heating circuit based at least on the third voltage includes: determining the open circuit detection result of the heating component based on at least one of the first voltage and the second voltage, and the third voltage. Determining the open circuit detection result of the heating component based on at least one of the first voltage and the second voltage, and the third voltage, is beneficial for determining the location of an open circuit fault in the battery heating circuit and allows for diversified verification of the detection results, thereby facilitating fault diagnosis and improving fault detection efficiency.

[0023] In some embodiments, determining the open circuit detection result of the battery heating circuit based on at least one of a first voltage and a second voltage, and a third voltage, includes: when the first terminal of the third sampling resistor is electrically connected to the positive terminal of the power supply, determining that the second heating element is open-circuited in response to the third voltage being greater than a first threshold and the first voltage being less than or equal to the first threshold; or when the first terminal of the third sampling resistor is electrically connected to the negative terminal of the power supply, determining that the first heating element is open-circuited in response to the third voltage being greater than the first threshold and the second voltage being less than or equal to the first threshold. The specific location where the heating element is de-energized can be determined using the first voltage / second voltage and the third voltage, pinpointing the open circuit to either the first or second heating element, which is beneficial for fault diagnosis and replacement of faulty components.

[0024] In some embodiments, the open circuit detection method further includes: acquiring a second voltage when the first terminal of the third sampling resistor is electrically connected to the positive terminal of the power supply; issuing a detection fault command in response to the ratio of the third voltage to the second voltage being less than a second threshold or greater than a third threshold; where the third threshold is greater than a fourth threshold; or acquiring a first voltage when the first terminal of the third sampling resistor is electrically connected to the negative terminal of the power supply; issuing a detection fault command in response to the ratio of the third voltage to the first voltage being less than a fourth threshold or greater than a fifth threshold; where the fifth threshold is greater than the fourth threshold. By setting a detection fault command triggering process, the reliability of the detection results can be improved.

[0025] In some embodiments, before connecting one of the first voltage detection branch and the second voltage detection branch, the heating element, and the third voltage detection branch to the power supply to form a first circuit, the method further includes: performing an open circuit detection on the battery heating circuit in response to receiving a battery heating signal indicating that the battery should be heated. Setting the open circuit detection on the battery heating circuit as a pre-processing step for heating the battery improves the safety and reliability of the battery heating circuit operation.

[0026] In some embodiments, in response to the closure of the first heating switch and the second heating switch, the heating component is in an operating state, and a third voltage is acquired across the third voltage detection branch; the open-circuit detection result of the heating component in the operating state is determined based on the third voltage. Determining the open-circuit detection result of the heating component in the operating state based on the third voltage enables re-inspection of the heating component, further improving the effectiveness and reliability of the detection results.

[0027] In some embodiments, determining the open-circuit detection result of the heating element under operating conditions based on the third voltage includes: when the first terminal of the third sampling resistor is electrically connected to the positive terminal of the power supply, determining that the second heating element is open-circuited in response to the third voltage being less than or equal to a first threshold; determining that the first heating element is open-circuited in response to the third voltage being the power supply voltage; or when the first terminal of the third sampling resistor is electrically connected to the negative terminal of the power supply, determining that the first heating element is open-circuited in response to the third voltage being less than or equal to the first threshold; and determining that the second heating element is open-circuited in response to the third voltage being the power supply voltage. The specific value of the third voltage can limit the fault detection accuracy of the heating element to the first and second heating elements, which is beneficial for re-inspection of the heating element and improves detection efficiency and reliability.

[0028] An embodiment of the fourth aspect of this application provides a battery management system, the battery management system including a detection circuit of the battery heating circuit as described in the foregoing embodiments; and the battery management system including a controller, wherein the controller is configured to perform the open circuit detection method as described in the foregoing embodiments.

[0029] An embodiment of the fifth aspect of this application provides a battery device, the battery device including the battery management system in the foregoing embodiments.

[0030] An embodiment of the sixth aspect of this application provides an electrical device, which includes the battery management system of the foregoing embodiments, or the battery device as described in the foregoing embodiments.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0032] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0033] Figure 1This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0034] Figure 2 This is an exploded structural diagram of a battery according to some embodiments of this application;

[0035] Figure 3 This is one of the circuit diagrams of the detection circuit of the battery heating circuit in some embodiments of this application;

[0036] Figure 4 This is a second circuit diagram of the detection circuit of the battery heating circuit in some embodiments of this application;

[0037] Figure 5 The third circuit diagram is of the detection circuit of the battery heating circuit in some embodiments of this application;

[0038] Figure 6 The fourth circuit diagram is a detection circuit of a battery heating circuit according to some embodiments of this application;

[0039] Figure 7 The fifth circuit diagram is of the detection circuit of the battery heating circuit in some embodiments of this application;

[0040] Figure 8 The sixth circuit diagram is a detection circuit of a battery heating circuit according to some embodiments of this application;

[0041] Figure 9 The seventh circuit diagram is a detection circuit of a battery heating circuit according to some embodiments of this application;

[0042] Figure 10 This is the eighth circuit diagram of the detection circuit of the battery heating circuit in some embodiments of this application;

[0043] Figure 11 The ninth circuit diagram is a detection circuit of a battery heating circuit according to some embodiments of this application;

[0044] Figure 12 The tenth circuit diagram is of the detection circuit of the battery heating circuit in some embodiments of this application;

[0045] Figure 13 Here is a flowchart of a circuit breaker detection method according to some embodiments of this application;

[0046] Figure 14 This is a circuit diagram of a first loop in some embodiments of this application;

[0047] Figure 15 This is a circuit diagram of the second circuit in some embodiments of this application;

[0048] Figure 16 This is a circuit diagram of a third circuit in some embodiments of this application.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1000 vehicles;

[0051] Battery 100, power supply 110, controller 200, motor 300, detection circuit 400;

[0052] Box 10, Part 11, Part 2 12;

[0053] Heating component 20, first heating part 21, second heating part 22;

[0054] First sampling resistor 31, second sampling resistor 32, third sampling resistor 33;

[0055] First heating switch K11, second heating switch K12, third heating switch K13, first detection switch K21, second detection switch K22, third detection switch K23;

[0056] First connection terminal P1, second connection terminal P2, third connection terminal P3;

[0057] First loop S1, second loop S2, third loop S3. Detailed Implementation

[0058] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0059] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0060] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0061] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0063] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0064] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0066] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0067] In low-temperature environments, battery performance is significantly affected, including but not limited to charge / discharge efficiency and capacity degradation. Furthermore, frequent charging and discharging in low-temperature environments can cause irreversible damage to the battery, thus reducing its lifespan. In some cases, when batteries are used in electric vehicles, if the battery temperature is too low, the vehicle may not be able to start.

[0068] Heating components (in some cases, heating films) are important auxiliary devices for improving the low-temperature performance of batteries, stabilizing the battery temperature within a reasonable range. From the perspective of battery output power, a reasonable temperature range helps the battery chemical reaction to be more complete, thus maintaining stable output power. From the perspective of battery lifespan, lithium dendrites are prone to form on the negative electrode of the battery at low temperatures, which can be effectively mitigated by the heating effect of the heating film. In addition, as one of the mainstream heating strategies for power battery thermal management, the heating film is managed and controlled by the battery management system. Through the interaction and feedback between the battery management system and the heating components, refined management of the battery can be achieved, enabling the battery to operate within a stable and safe temperature range.

[0069] A heating film typically consists of a heating layer, an insulating layer, a thermally conductive layer, and other auxiliary layers. In some cases, the heating layer of the heating film is constructed using linear metal wires (such as nichrome alloy wire) arranged according to a specific circuit pattern. Each wire is equivalent to a resistance wire with a certain resistance value, and multiple resistance wires are connected in series to form the heating film. In other cases, the heating film is composed of multiple small heating modules in different zones, which are connected in series through a specific circuit connection method. Furthermore, in some cases, connecting multiple heating films in series can also improve the heating effect and thus improve the battery temperature.

[0070] Fault detection in heating films relies on current or temperature, which is neither precise enough nor effective enough. Furthermore, it only detects faults while the heating film is operating, failing to detect open circuits in advance, thus hindering maintenance. Additionally, when an open circuit occurs, all heating films within the affected battery heating circuit must be replaced, a costly approach that cannot effectively detect and replace faulty components such as metal wires, heating modules, or individual heating films.

[0071] Based on the above considerations, this application provides a detection circuit for a battery heating circuit, a battery heating component, an open circuit detection method, and a system. The detection circuit for a battery heating circuit provided by this application includes a first heating switch, a heating component, and a second heating switch connected in series. The heating component has a first connection terminal, a second connection terminal, and a third connection terminal located between the first and second connection terminals. The heating component includes a first heating part located between the first and third connection terminals, and a second heating part located between the third and second connection terminals. The first connection terminal is electrically connected to the positive terminal of the power supply through the first heating switch, and the second connection terminal is electrically connected to the negative terminal of the power supply through the second heating switch.

[0072] The detection circuit includes a first voltage detection branch, a second voltage detection branch, and a third voltage detection branch. The first voltage detection branch includes a first detection switch and a first sampling resistor connected in series. The first terminal of the first voltage detection branch is electrically connected to the positive terminal of the power supply, and the second terminal of the first voltage detection branch is electrically connected to a second connection terminal. The first voltage detection branch is used to detect a first voltage between the positive terminal of the power supply and the second connection terminal. The second voltage detection branch includes a second detection switch and a second sampling resistor connected in series. The first terminal of the second voltage detection branch is electrically connected to the negative terminal of the power supply, and the second terminal of the second voltage detection branch is electrically connected to the first connection terminal. The second voltage detection branch is used to detect a second voltage between the negative terminal of the power supply and the first connection terminal. The third voltage detection branch includes a third detection switch and a third sampling resistor connected in series. The first terminal of the third voltage detection branch is electrically connected to either the positive or negative terminal of the power supply, and the second terminal of the third voltage detection branch is electrically connected to the third connection terminal. The third voltage detection branch is used to detect a third voltage between the third connection terminal and either the positive or negative terminal of the power supply. This allows for open circuit detection both when the heating element is in working and non-working states, and the detection of open circuits can be more accurate. It also enables diverse verification of the detection results, which is beneficial for troubleshooting and improves fault detection efficiency.

[0073] The detection circuit of the battery heating circuit disclosed in this application embodiment can be used to diagnose the battery. The battery disclosed in this application embodiment can be used, but is not limited to, in electrical devices such as vehicles, ships, aircraft, or energy storage.

[0074] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, energy storage devices, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0075] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0076] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0077] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space. Alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0079] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0080] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0081] This application provides a detection circuit 400 for a battery heating circuit, such as... Figure 3 and Figure 4 As shown (the first detection switch K21, the second detection switch K22, and the third detection switch K23 are not in...), Figure 3 and Figure 4 As shown in the diagram, the battery heating circuit includes a first heating switch K11, a heating element 20, and a second heating switch K12 connected in series. The heating element 20 has a first connection terminal P1, a second connection terminal P2, and a third connection terminal P3 located between the first connection terminal P1 and the second connection terminal P2. The heating element 20 includes a first heating part 21 located between the first connection terminal P1 and the third connection terminal P3, and a second heating part 22 located between the third connection terminal P3 and the second connection terminal P2. The first connection terminal P1 is electrically connected to the positive terminal of the power supply 110 through the first heating switch K11, and the second connection terminal P2 is electrically connected to the negative terminal of the power supply 110 through the second heating switch K12.

[0082] The detection circuit 400 includes a first voltage detection branch, a second voltage detection branch, and a third voltage detection branch. The first voltage detection branch includes a first detection switch K21 and a first sampling resistor 31 connected in series. The first terminal of the first voltage detection branch is electrically connected to the positive terminal of the power supply 110, and the second terminal is electrically connected to the second connection terminal P2. The first voltage detection branch is used to detect a first voltage between the positive terminal of the power supply 110 and the second connection terminal P2. The second voltage detection branch includes a second detection switch K22 and a second sampling resistor 32 connected in series. The first terminal of the second voltage detection branch is electrically connected to the negative terminal of the power supply 110. The second voltage detection branch is electrically connected to the first connection terminal P1. The second voltage detection branch is used to detect the second voltage between the negative terminal of the power supply 110 and the first connection terminal P1. The third voltage detection branch includes a third detection switch K23 and a third sampling resistor 33 connected in series. The first terminal of the third voltage detection branch is electrically connected to the positive or negative terminal of the power supply 110. The second terminal of the third voltage detection branch is electrically connected to the third connection terminal P3. The third voltage detection branch is used to detect the third voltage between the third connection terminal P3 and the positive or negative terminal of the power supply 110.

[0083] The battery heating circuit is used to heat the battery so that it can operate normally under suitable conditions. It is primarily based on the Joule heating effect of a resistance wire; that is, when current passes through a resistance wire with a certain resistance, electrical energy is converted into heat energy to heat the battery. The battery heating circuit can consist of a first heating switch K11, a heating element 20, and a second heating switch K12. In some embodiments, the first heating switch K11 and the second heating switch K12 are respectively connected to the positive and negative terminals of the power supply 110 as a positive and negative heating relay, thereby controlling the on / off state of the battery heating circuit. The heating element 20 can be a single heating film composed of multiple metal wires or small heating modules connected in series, or it can be composed of multiple heating films connected in series.

[0084] The power supply 110 can be multiple battery packs connected in series or parallel. The first connection terminal P1 can be the node connecting the first heating switch K11 and the positive terminal of the power supply 110. The second connection terminal P2 can be the node connecting the second heating switch K12 and the negative terminal of the power supply 110. The third connection terminal P3 can be the node connecting the first heating element 21 and the second heating element 22. It should be understood that the heating element 20 can be interpreted differently in different situations. Taking a single heating film composed of multiple metal wires or small heating modules connected in series as an example, in this case, the heating element 20 is a single heating film, while the first heating element 21 and the second heating element 22 are adjacent metal wires or heating modules connected in series, and the third connection terminal P3 is the connection node between the metal wires or heating modules. In other embodiments, the battery heating circuit connects multiple heating films in series, so the first heating element 21 and the second heating element 22 can both be single or multiple heating films, and the third connection terminal P3 is the connection node between adjacent heating films.

[0085] The detection circuit 400 includes a first voltage detection branch, a second voltage detection branch, and a third voltage detection branch. Specifically, the first voltage detection branch consists of a first detection switch K21 and a first sampling resistor 31 connected in series; the second voltage detection branch consists of a second detection switch K22 and a second sampling resistor 32 connected in series; and the third voltage detection branch consists of a third detection switch K23 and a third sampling resistor 33 connected in series. It should be understood that the specific connection position of the first detection switch K21 and the first sampling resistor 31 in the first voltage detection branch may not be unique. For example… Figure 3 As shown, when the first terminal of the third voltage detection branch is electrically connected to the negative terminal of the power supply 110, the first detection switch K21 can be installed between the first sampling resistor 31 and the positive terminal of the power supply 110, or between the second sampling resistor 32 and the second connection terminal P2; Figure 4 As shown, when the first terminal of the third voltage detection branch is electrically connected to the positive terminal of the power supply 110, the first detection switch K21 can be installed between the first sampling resistor 31 and the branch connection node (the connection node between the third voltage detection branch and the first voltage detection branch), or between the second sampling resistor 32 and the second connection terminal P2. Similarly, the positions of the second detection switch K22 and the third detection switch K23 are not limited, as long as they can realize the switching of the corresponding detection branch. In addition, it should be noted that the equivalent resistance values ​​of the first sampling resistor 31, the second sampling resistor 32, and the third sampling resistor 33 are all much larger than the equivalent resistance value of the heating element.

[0086] In some embodiments, the first detection switch K21, the second detection switch K22, and the third detection switch K23 may include, but are not limited to, components capable of controlling the on / off state of a circuit, such as a MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor), an IGBT transistor (Insulated-Gate Bipolar Transistor), or a relay.

[0087] In the above technical solution, the third voltage detection branch can be used to detect the third voltage between the third connection terminal P3 and the positive terminal of the power supply 110 or between the third connection terminal P3 and the negative terminal of the power supply 110. This can realize open circuit detection when the heating component is in working or non-working state, thereby determining the location of the open circuit fault in the battery heating circuit, making the detection of the open circuit more accurate. At the same time, the first voltage, second voltage and third voltage can realize diversified verification of the detection results, further improving the detection accuracy and efficiency, which is conducive to fault diagnosis and replacement of faulty components.

[0088] refer to Figure 5 and Figure 6 According to some embodiments of this application, there are multiple heating elements 20 connected in parallel; and wherein, the third voltage detection branch is configured to detect the third voltage between the positive terminal of the power supply 110 and the third connection terminal P3 (P3A, P3B, P3C) of any one of the multiple heating elements 20, or between the negative terminal of the power supply 110 and the third connection terminal P3 (P3A, P3B, P3C) of any one of the multiple heating elements 20.

[0089] like Figure 5 and Figure 6 As shown, there are multiple heating elements 20, each having multiple first heating elements 21 (21A, 21B, 21C) and second heating elements 22 (22A, 22B, 22C). A third voltage detection branch is configured to detect the third voltage between the negative terminal of the power supply 110 and the third connection terminal P3 (P3A, P3B, P3C) of any one of the multiple heating elements 20. The three heating elements 20 are connected in parallel between the first heating switch K11 and the second heating switch K12.

[0090] The third voltage detection branch can detect the third voltage of multiple heating components 20, thereby determining whether there is a fault in the heating component 20 between the third connection terminal P3 and the positive terminal of the power supply 110 or between the third connection terminal P3 and the negative terminal of the power supply 110, which helps to improve detection efficiency and reduce detection time.

[0091] refer to Figure 5 and Figure 6 According to some embodiments of this application, there are multiple third voltage detection branches, and each of the multiple third voltage detection branches is connected to a third connection terminal P3 of each of the multiple heating components 20.

[0092] like Figure 5 As shown, multiple third voltage detection branches are configured to detect the third voltage between the negative terminal of the power supply 110 and the corresponding third connection terminal P3 of the heating element 20, and as... Figure 6 As shown, multiple third voltage detection branches are configured to detect the third voltage between the positive terminal of the power supply 110 and the third connection terminal P3 of the corresponding heating element 20. Each of these third voltage detection branches is controlled by its own third detection switch K23 (K23A, K23B, K23C), and each branch includes a third detection switch K23 (K23A, K23B, K23C) and a third sampling resistor 33 (33A, 33B, 33C). It should be understood that, as mentioned above, the position of the third detection switch K23 is... Figure 5 This is just one example; it is sufficient as long as the third detection switch K23 can control the on / off state of the corresponding third voltage detection branch.

[0093] By detecting the third voltage of multiple heating components 20 through multiple third voltage detection branches, it is possible to determine whether an open circuit has occurred in the multiple heating components 20, thereby improving detection efficiency.

[0094] refer to Figure 7 and Figure 8 According to some embodiments of this application, the third voltage detection branch includes multiple third detection switches K23 (K23A, K23B, K23C) connected in parallel. The first terminal of the multiple third detection switches K23 (K23A, K23B, K23C) is connected to the third sampling resistor 33, and the second terminal of the multiple third detection switches K23 is connected to the third connection terminal P3 (P3A, P3B, P3C) of each of the multiple heating components 20 in a one-to-one correspondence.

[0095] like Figure 7 As shown, the two ends of the third voltage detection branch are respectively connected to the third connection terminal P3 of different heating components 20 and the negative terminal of power supply 110, as follows. Figure 8As shown, the two ends of the third voltage detection branch are connected to the third connection terminal P3 of different heating components 20 and the positive terminal of the power supply 110, respectively. There are multiple heating components 20, each having multiple first heating parts 21 (21A, 21B, 21C) and second heating parts 22 (22A, 22B, 22C). One end of multiple third detection switches K23 (K23A, K23B, K23C) is connected to a single third sampling resistor 33, and the other end is connected to the respective third connection terminal P3 (P3A, P3B, P3C) of each heating component 20. Therefore, when it is necessary to detect the third voltage of a certain heating component 20, it is only necessary to close the corresponding third detection switch K23 (K23A, K23B, K23C).

[0096] By setting the first end of multiple third detection switches K23 to be connected to the third sampling resistor 33, and the second end of multiple third detection switches K23 to be connected one-to-one with the third connection terminal P3 of each of the multiple heating components 20, the third sampling resistor 33 can be universally used. This avoids the need to add a complete third voltage detection branch for detection for each additional heating component 20, thereby reducing the possibility of redundant setting of the third sampling resistor 33 and improving detection efficiency.

[0097] According to some embodiments of this application, the detection circuit 400 includes a processor that is signal-connected to a first voltage detection branch, a second voltage detection branch, and a third voltage detection branch. The processor is configured to determine the open circuit detection result of the battery heating circuit based on at least one of the first voltage, the second voltage, and the third voltage.

[0098] A processor can be a single processing unit or multiple processing units, and all processing units can include a single or multiple computing units or multiple cores. A processor can be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuits, and / or any device that manipulates signals based on operating instructions.

[0099] The processor can be connected to the first voltage detection branch, the second voltage detection branch, and the third voltage detection branch via wired transmission (e.g., cable) or wireless transmission (e.g., Bluetooth protocol). The processor determines the open circuit detection result of the battery heating circuit based on at least one of the first voltage, the second voltage, and the third voltage.

[0100] The processor enables open circuit detection of the battery heating circuit, achieving high efficiency and providing highly stable and reliable results.

[0101] This application provides a battery heating assembly, which includes a battery heating circuit. The battery heating circuit includes a first heating switch K11, a heating element 20, and a second heating switch K12 connected in series. The heating element 20 has a first connection terminal P1, a second connection terminal P2, and a third connection terminal P3 located between the first connection terminal P1 and the second connection terminal P2. The heating element 20 includes a first heating part 21 located between the first connection terminal P1 and the third connection terminal P3, and a second heating part 22 located between the third connection terminal P3 and the second connection terminal P2. The first connection terminal P1 is electrically connected to the positive terminal of a power supply 110 through the first heating switch K11, and the second connection terminal P2 is electrically connected to the negative terminal of the power supply 110 through the second heating switch K12. The battery heating assembly also includes a detection circuit 400 as described in the previous embodiment, which is used to detect an open circuit in the heating element 20 of the battery heating circuit.

[0102] like Figure 9 As shown, the detection circuit 400 can be a loop independent of the battery heating circuit. In some embodiments, the detection circuit 400 can be integrated into a special device and used to detect the first voltage, second voltage, and third voltage in the battery heating circuit. The detection circuit 400 can have five pins that are electrically connected to the first connection terminal P1, the second connection terminal P2, the third connection terminal P3 of the battery heating circuit, the positive terminal of the power supply 110, and the negative terminal of the power supply 110, respectively. In some embodiments, the five pins of the detection circuit 400 and the corresponding interface of the battery heating circuit can be electrically connected via plug-in, spring contact, clamp connection, and flexible cable.

[0103] In addition to the battery heating circuit and detection circuit 400, the battery heating assembly may also include a temperature sensing unit and a control unit. The temperature sensing unit can detect the battery temperature, and the control unit can control the opening and closing of all switching elements in the battery heating assembly. Furthermore, the battery heating assembly may also include heat insulation material to maintain the battery's temperature and prevent heat loss.

[0104] The detection circuit 400 is set independently from the battery heating circuit. A single detection circuit 400 can be used to perform open circuit detection on multiple different battery heating circuits. This is beneficial for determining the specific location of the break point of the heating component 20 in different battery heating circuits, saving detection costs and improving detection efficiency.

[0105] like Figure 10As shown, according to some embodiments of this application, the battery heating circuit includes a plurality of heating elements 20 and a plurality of third heating switches K13 (K13A, K13B, K13C). Any one of the plurality of heating elements 20 is connected in series with a third heating switch K13 (K13A, K13B, K13C) and then connected in parallel with the other heating elements 20. A first voltage detection branch is configured to detect the voltage between the positive terminal of the power supply 110 and the second connection terminal P2 of any one of the plurality of heating elements 20; a second voltage detection branch is configured to detect the voltage between the negative terminal of the power supply 110 and the first connection terminal P1 of any one of the plurality of heating circuits; and a third voltage detection branch is configured to detect the voltage between the positive terminal of the power supply 110 and the third connection terminal P3 (P3A, P3B, P3C) of any one of the plurality of heating circuits, or the voltage between the negative terminal of the power supply 110 and the third connection terminal P3 (P3A, P3B, P3C) of any one of the plurality of heating circuits.

[0106] There are multiple heating elements 20, each having multiple first heating elements 21 (21A, 21B, 21C) and second heating elements 22 (22A, 22B, 22C). The third heating switch K13 can be a component capable of controlling the on / off state of the circuit, including but not limited to a MOSFET, IGBT, or relay. Figure 10 As shown, the third heating switch K13 is installed between the first heating part 21 and the first connecting end P1. It should be understood that... Figure 10 This only shows one embodiment of the installation of multiple third heating switches K13 (K13A, K13B, K13C). In other embodiments, the third heating switches K13 may also be installed between the second heating part 22 and the second connection terminal P2, or between the first heating part 21 and the second heating part 22, as long as the operation of the corresponding heating component 20 can be achieved by closing or opening the third heating switch K13.

[0107] By controlling the third heating switch K13, the working conditions of the heating component 20 can be switched and the first voltage, second voltage and third voltage can be detected, which helps to determine whether there is an open circuit in the battery heating circuit and improves the fault detection efficiency.

[0108] like Figure 11As shown, according to some embodiments of this application, there are multiple battery heating circuits connected in parallel between the positive and negative terminals of the power supply 110. A first voltage detection branch is configured to detect a first voltage between the positive terminal of the power supply 110 and a second connection terminal P2 (P2A, P2B, P2C) of any one of the multiple battery heating circuits; a second voltage detection branch is configured to detect a second voltage between the negative terminal of the power supply 110 and a first connection terminal P1 (P1A, P1B, P1C) of any one of the multiple battery heating circuits; and a third voltage detection branch is configured to detect a third voltage between the positive terminal of the power supply 110 and a third connection terminal P3 (P3A, P3B, P3C) of any one of the multiple battery heating circuits, or between the negative terminal of the power supply 110 and a third connection terminal P3 (P3A, P3B, P3C) of any one of the multiple battery heating circuits.

[0109] The number of heating components 20 is multiple, correspondingly having multiple first heating parts 21 (21A, 21B, 21C) and second heating parts 22 (22A, 22B, 22C). Multiple battery heating circuits are connected in parallel between the positive and negative terminals of the power supply 110. Heating operations of different battery heating circuits can be achieved by controlling the first heating switch K11 (K11A, K11B, K11C) and the second heating switch K12 (K12A, K12B, K12C). In some embodiments, the first voltage detection branch can be externally connected to multiple pins and electrically connected to the second connection terminals P2 (P2A, P2B, P2C) of different battery heating circuits; the second voltage detection branch can be externally connected to multiple pins and electrically connected to the first connection terminals P1 (P1A, P1B, P1C) of different battery heating circuits; and one end of the third voltage detection branch is electrically connected to the third connection terminal P3 (P3A, P3B, P3C) of different battery heating circuits.

[0110] By employing a first voltage detection branch, a second voltage detection branch, and a third voltage detection branch, multiple battery heating circuits can be detected, thereby determining the power-off location of the battery heating circuit and improving detection efficiency.

[0111] According to some embodiments of this application, there are multiple detection circuits 400, and each of the multiple detection circuits 400 is connected to a corresponding multiple battery heating circuits.

[0112] The detection circuit 400 and multiple battery heating circuits are set up accordingly, which helps to improve the accuracy of detection, thereby enabling fault diagnosis and improving the reliability of detection.

[0113] like Figure 12As shown, according to some embodiments of this application, the first voltage detection branch includes multiple first detection switches K21 (K21A, K21B, K21C) connected in parallel. The first terminals of the multiple first detection switches K21 (K21A, K21B, K21C) are connected to the first sampling resistor 31, and the second terminals of the multiple first detection switches K21 (K21A, K21B, K21C) are connected to the second connection terminals P2 (P2A, P2B, P2C) of the multiple battery heating circuits, respectively. One or more first detection switches K21 (K21A, K21B, K21C) are connected to the positive terminal of the power supply 110; the second voltage detection branch includes multiple second detection switches K22 (K22A, K22B, K22C) connected in parallel, the first terminal of the multiple second detection switches K22 (K22A, K22B, K22C) is connected to the second sampling resistor 32, and the first terminal of the multiple second detection switches K22 (K22A, K22B, K22C) is connected to the positive terminal of the power supply 110; The two terminals are connected one-to-one with the first connection terminals P1 (P1A, P1B, P1C) of each of the multiple battery heating circuits, or the second terminals of multiple second detection switches K22 (K22A, K22B, K22C) are connected to the negative terminal of the power supply 110; the third voltage detection branch includes multiple third detection switches K23 (K23A, K23B, K23C) connected in parallel, and the first terminals of the multiple third detection switches K23 (K23A, K23B, K23C) are connected to the third sampling circuit. The resistor 33 is connected, and the second terminals of multiple third detection switches K23 (K23A, K23B, K23C) are connected one-to-one with the third connection terminals P3 (P3A, P3B, P3C) of each of the multiple battery heating circuits, or the second terminals of multiple third detection switches K23 (K23A, K23B, K23C) are connected to the positive terminal of power supply 110, or the second terminals of multiple third detection switches K23 (K23A, K23B, K23C) are connected to the negative terminal of power supply 110.

[0114] Figure 12This is only one embodiment of the present application, wherein there are multiple heating components 20, each having multiple first heating parts 21 (21A, 21B, 21C) and second heating parts 22 (22A, 22B, 22C). The second ends of multiple first detection switches K21 (K21A, K21B, K21C) are connected one-to-one with the second connection terminals P2 (P2A, P2B, P2C) of each of the multiple battery heating circuits. The second ends of multiple second detection switches K22 (K22A, K22B, K22C) are connected one-to-one with the first connection terminals P1 (P1A, P1B, P1C) of each of the multiple battery heating circuits. The second ends of multiple third detection switches K23 (K23A, K23B, K23C) are connected one-to-one with the third connection terminals P3 (P3A, P3B, P3C) of each of the multiple battery heating circuits. It should be understood that the installation positions of the first detection switch K21, the second detection switch K22, and the third detection switch K23 can be varied, as long as they can control the on / off state of the corresponding voltage detection branch.

[0115] When detecting the first, second, and third voltages of a battery heating circuit, the first detection switch K21, the second detection switch K22, and the third detection switch K23, which are not corresponding to that battery heating circuit, are always disconnected. Furthermore, by controlling the on / off state of different switches, switching can be achieved to detect another battery heating circuit.

[0116] This allows for the universality of the first sampling resistor 31, the second sampling resistor 32, and the third sampling resistor 33, avoiding the need to add a complete first voltage detection branch, second voltage detection branch, and third voltage detection branch for each additional battery heating circuit. This reduces redundant resistor settings and improves detection efficiency.

[0117] According to some embodiments of this application, the battery heating assembly further includes a controller, which is signal-connected to both the battery heating circuit and the detection circuit 400. The controller is configured to control the battery heating circuit to heat the battery and to control the detection circuit 400 to perform open circuit detection on the battery heating circuit.

[0118] The controller can control the opening and closing of all switching elements in the battery heating assembly to achieve battery heating and open circuit detection. It should be understood that the switching elements mentioned here include the first heating switch K11, the second heating switch K12, the third heating switch K13, the first detection switch K21, the second detection switch K22, and the third detection switch K23. In some embodiments, the controller may include, but is not limited to, the controller in the vehicle's MCU (Microcontroller Unit) or the controller in the battery's BMS (Battery Management System).

[0119] By setting the controller, precise control of the battery heating circuit and detection circuit 400 can be achieved, and the signals of the first voltage, second voltage and third voltage can be collected to determine the fault location of the battery heating circuit, thereby improving the reliability and accuracy of detection.

[0120] like Figure 13 As shown, this application provides an open circuit detection method, applied to the detection circuit 400 as described in the foregoing embodiment or the battery heating assembly as described in the foregoing embodiment. The open circuit detection method includes:

[0121] S110. Connect one of the first voltage detection branch and the second voltage detection branch, the heating component 20, the third voltage detection branch and the power supply 110 to form a first circuit S1.

[0122] S120. Obtain the third voltage at both ends of the third voltage detection branch;

[0123] S130. Determine the open circuit detection result of the battery heating circuit based at least on the third voltage.

[0124] like Figure 3 , Figure 4 as well as Figure 14 As shown, when both the first heating switch K11 and the second heating switch K12 are in the off state, one of the first voltage detection branch and the second voltage detection branch, the heating component 20, the third voltage detection branch, and the power supply 110 are connected to form a first circuit S1. It should be understood that the heating component 20 forming the first circuit S1 can be either the first heating part 21 or the second heating part 22.

[0125] This allows for the determination of the open circuit detection result of the battery heating circuit based at least on the third voltage, thereby confirming the location of the break point and facilitating fault diagnosis.

[0126] According to some embodiments of this application, S110 includes: controlling the second detection switch K22 and the third detection switch K23 to close when the first terminal of the third sampling resistor 33 is electrically connected to the positive terminal of the power supply 110; and wherein determining the open circuit detection result of the battery heating circuit based at least on the third voltage includes: determining that the first heating part 21 of the heating component 20 is open-circuited in response to the third voltage being less than or equal to the first threshold; or controlling the first detection switch K21 and the third detection switch K23 to close when the first terminal of the third sampling resistor 33 is electrically connected to the negative terminal of the power supply 110; and wherein determining the open circuit detection result of the battery heating circuit based at least on the third voltage includes: determining that the second heating part 22 of the heating component 20 is open-circuited in response to the third voltage being less than or equal to the first threshold.

[0127] The first threshold is a pre-set threshold parameter stored in memory used to determine the detection result. Ideally, when an open circuit occurs in the loop containing the detection branch, the detected voltage value is 0. However, since the first, second, and third voltages can be measured by external voltage detection equipment, and the battery heating circuit or detection branch may contain components such as capacitors and inductors, these components may affect the detection result of the voltage detection equipment by influencing the surrounding electric or magnetic fields. Furthermore, leakage current may exist in the detection circuit and electronic components, or there may be parasitic parameters such as parasitic capacitance and resistance. These factors can also cause the detected results of the first, second, and third voltages to be non-zero in the open circuit state. Therefore, when determining whether an open circuit has occurred based on the detection result, a first threshold slightly greater than 0 can be reasonably set according to the specific circuit structure or the accuracy of the voltage detection equipment. When the detected voltage is less than or equal to this first threshold, an open circuit is determined to have occurred. In some embodiments, the range of the first threshold can be set to be greater than or equal to 5 millivolts (mV) and less than or equal to 50 millivolts (mV), specifically 5mV, 6mV, 7mV, 8mV, 10mV, 15mV, 20mV, 25mV, 30mV, 40mV or 50mV.

[0128] like Figure 3 and Figure 14In one embodiment, with the first terminal of the third sampling resistor 33 electrically connected to the negative terminal of the power supply 110, and both the first heating switch K11 and the second heating switch K12 in the open state, and the first detection switch K21 and the third detection switch K23 closed. If there is no open circuit fault in the battery heating circuit, the first voltage detection branch, the second heating part 22, and the third voltage detection branch will be successfully energized and connected to the power supply 110 to form the first circuit S1. That is, the current flows through the positive terminal of the power supply 110, sequentially through the first voltage detection branch, the second heating part 22, and the third voltage detection branch, and finally returns to the negative terminal of the power supply 110. In this case, if the third voltage is less than or equal to the first threshold, it is determined that the second heating part 22 of the heating component 20 has an open circuit fault. In some embodiments, when the third voltage is 0, it can be determined that the second heating part 22 of the heating component 20 has an open circuit fault.

[0129] like Figure 4 In one embodiment, with the first terminal of the third sampling resistor 33 electrically connected to the positive terminal of the power supply 110 and both the first heating switch K11 and the second heating switch K12 in the open state, and the second detection switch K22 and the third detection switch K23 closed. If there is no open circuit fault in the battery heating circuit, the second voltage detection branch, the first heating part 21, and the third voltage detection branch will be successfully energized and connected to the power supply 110 to form the first circuit S1. In this case, if the third voltage is less than or equal to the first threshold, it is determined that the first heating part 21 of the heating component 20 has an open circuit fault. In some embodiments, when the third voltage is 0, it can be determined that the first heating part 21 of the heating component 20 has an open circuit fault.

[0130] The location of the break point in the heating component 20 can be determined based on the third voltage, which is beneficial for detecting open circuit faults and replacing faulty components, thereby improving the effectiveness and reliability of fault detection.

[0131] like Figure 15 As shown, according to some embodiments of this application, the circuit breaker detection method further includes: connecting one of the first heating switch K11 and the second heating switch K12, the heating component 20, and the third voltage detection branch to the power supply 110 to form a second circuit S2; acquiring the third voltage across the third voltage detection branch again; and determining the circuit breaker detection result of the heating component 20 based at least on the acquired third voltage.

[0132] like Figure 3 , Figure 4 as well as Figure 15As shown, when both the first detection switch K21 and the second detection switch K22 are in the off state, one of the first heating switch K11 and the second heating switch K12, the heating component 20, and the third voltage detection branch are connected to the power supply 110 to form a second circuit S2. It should be understood that the heating component 20 forming the first circuit S1 can be either the first heating part 21 or the second heating part 22.

[0133] This allows for the determination of the open circuit detection result of the battery heating circuit based at least on the third voltage, thereby confirming the location of the break point and facilitating fault diagnosis.

[0134] According to some embodiments of this application, connecting one of the first heating switch K11 and the second heating switch K12, the heating component 20, and the third voltage detection branch to the power supply 110 to form a second circuit S2 includes: when the first terminal of the third sampling resistor 33 is electrically connected to the positive terminal of the power supply 110, controlling the second heating switch K12 and the third detection switch K23 to close; and wherein determining the open circuit detection result of the battery heating circuit based at least on the re-acquired third voltage includes: determining that the second heating part 22 is open circuit in response to the re-acquired third voltage being less than or equal to a first threshold; or when the first terminal of the third sampling resistor 33 is electrically connected to the negative terminal of the power supply 110, controlling the first heating switch K11 and the third detection switch K23 to close; and wherein determining the open circuit detection result of the battery heating circuit based at least on the re-acquired third voltage includes: determining that the first heating part 21 is open circuit in response to the re-acquired third voltage being less than or equal to a first threshold.

[0135] like Figure 3 and Figure 15 In one embodiment, with the first terminal of the third sampling resistor 33 electrically connected to the negative terminal of the power supply 110, and the first detection switch K21, the second detection switch K22, and the second heating switch K12 all in the open state, and the first heating switch K11 and the third detection switch K23 closed. If there is no open circuit fault in the battery heating circuit, the first heating switch K11, the first heating part 21, and the third voltage detection branch will be energized and connected to the power supply 110 to form a second circuit S2. That is, the current flows through the positive terminal of the power supply 110, sequentially through the first heating switch K11, the first heating part 21, and the third voltage detection branch, and finally returns to the negative terminal of the power supply 110. In this case, if the third voltage is less than or equal to the first threshold, it is determined that the first heating part 21 of the heating component 20 has an open circuit fault. In some embodiments, when the third voltage is 0, it can be determined that the first heating part 21 of the heating component 20 has an open circuit fault.

[0136] like Figure 4In one embodiment, with the first terminal of the third sampling resistor 33 electrically connected to the positive terminal of the power supply 110, and the first detection switch K21, the second detection switch K22, and the first heating switch K11 all in the open state, and the second heating switch K12 and the third detection switch K23 closed. If there is no open circuit fault in the battery heating circuit, the second heating switch K12, the second heating part 22, and the third voltage detection branch will be energized and connected to the power supply 110 to form the second circuit S2. In this case, if the third voltage is less than or equal to the first threshold, it is determined that the second heating part 22 of the heating component 20 has an open circuit fault. In some embodiments, when the third voltage is 0, it can be determined that the second heating part 22 of the heating component 20 has an open circuit fault.

[0137] The location of the break point in the heating element 20 can be determined based on the third voltage, which makes it easier to limit the fault range to the first heating part 21 or the second heating part 22. This facilitates the detection of open circuit faults and the replacement of faulty components, thereby improving the effectiveness and reliability of fault detection.

[0138] like Figure 16 As shown, according to some embodiments of this application, the open circuit detection method further includes: connecting the first voltage detection branch, the heating component 20, and the second voltage detection branch to the power supply 110 to form a third circuit S3; and obtaining the first voltage at both ends of the first voltage detection branch and / or the second voltage at both ends of the second voltage detection branch; and wherein determining the open circuit detection result of the battery heating circuit based at least on the third voltage includes: determining the open circuit detection result of the heating component 20 based on at least one of the first voltage and the second voltage, and the third voltage.

[0139] like Figure 3 , Figure 4 as well as Figure 16 As shown, when the first heating switch K11 and the second heating switch K12 are both in the open state, and the first detection switch K21 and the second detection switch K22 are closed, the first voltage detection branch, the heating component 20 and the second voltage detection branch are connected to the power supply 110 to form a third circuit S3.

[0140] Determining the open circuit detection result of the heating component 20 based on at least one of the first voltage and the second voltage, as well as the third voltage, is beneficial for judging the location of the open circuit fault in the battery heating circuit and can realize diversified verification of the detection result, thereby facilitating fault diagnosis and improving fault detection efficiency.

[0141] According to some embodiments of this application, determining the open circuit detection result of the battery heating circuit based on at least one of a first voltage and a second voltage, and a third voltage, includes: when the first terminal of the third sampling resistor 33 is electrically connected to the positive terminal of the power supply 110, determining that the second heating section 22 is open circuit in response to the third voltage being greater than a first threshold and the first voltage being less than or equal to the first threshold; or when the first terminal of the third sampling resistor 33 is electrically connected to the negative terminal of the power supply 110, determining that the first heating section 21 is open circuit in response to the third voltage being greater than the first threshold and the second voltage being less than or equal to the first threshold.

[0142] like Figure 3 and Figure 16 In one embodiment, with the first terminal of the third sampling resistor 33 electrically connected to the negative terminal of the power supply 110 and the first heating switch K11 and the second heating switch K12 in the open state, and the first detection switch K21 and the second detection switch K22 closed. If there is no open circuit fault in the battery heating circuit, the first voltage detection branch, the heating component 20, and the second voltage detection branch are connected to the power supply 110 to form a third circuit S3. That is, the current flows through the positive terminal of the power supply 110, sequentially through the first voltage detection branch, the first heating component 21, the second heating component 22, and the second voltage detection branch, and finally returns to the negative terminal of the power supply 110. If the third voltage is greater than the first threshold and the second voltage is less than or equal to the first threshold, it is determined that the first heating component 21 is open-circuited. In some embodiments, when the third voltage is greater than 0 and the second voltage is 0, it is determined that the first heating component 21 is open-circuited.

[0143] like Figure 4 In one embodiment, with the first terminal of the third sampling resistor 33 electrically connected to the positive terminal of the power supply 110 and the first heating switch K11 and the second heating switch K12 in the open state, and the first detection switch K21 and the second detection switch K22 closed. If there is no open circuit fault in the battery heating circuit, the first voltage detection branch, the heating component 20, and the second voltage detection branch are connected to the power supply 110 to form a third circuit S3. If the third voltage is greater than the first threshold and the first voltage is less than or equal to the first threshold, it is determined that the second heating part 22 has an open circuit. In some embodiments, it is determined that the second heating part 22 has an open circuit when the third voltage is greater than 0 and the first voltage is 0.

[0144] The specific location where the heating element 20 is de-energized can be determined by the first voltage, the second voltage, and the third voltage, and the circuit break can be pinpointed to the first heating element 21 or the second heating element 22, which is beneficial for troubleshooting and replacing faulty components.

[0145] According to some embodiments of this application, the open circuit detection method further includes: acquiring a second voltage when the first terminal of the third sampling resistor 33 is electrically connected to the positive terminal of the power supply 110; issuing a fault detection command in response to the ratio of the third voltage to the second voltage being less than a second threshold or greater than a third threshold; the third threshold being greater than the second threshold; or acquiring a first voltage when the first terminal of the third sampling resistor 33 is electrically connected to the negative terminal of the power supply 110; issuing a fault detection command in response to the ratio of the third voltage to the first voltage being less than a fourth threshold or greater than a fifth threshold; the fifth threshold being greater than the fourth threshold.

[0146] The second, third, fourth, and fifth thresholds are pre-set threshold parameters stored in memory for judging the detection results. Ideally, for components in the same circuit, the ratio of the voltage values ​​across the component is the same as the ratio of its corresponding resistance value. However, since the first, second, and third voltages can be measured by external voltage detection equipment, detection errors can occur during the detection process due to equipment accuracy, fluctuations in external electric or magnetic fields, etc. Therefore, when determining whether to issue a fault detection command, the second, third, fourth, and fifth thresholds can be reasonably set according to the specific circuit structure or the accuracy of the voltage detection equipment.

[0147] The third threshold is slightly greater than the resistance ratio k1 of the third sampling resistor 33 and the second sampling resistor 32; the second threshold is slightly less than the resistance ratio k1 of the third sampling resistor 33 and the second sampling resistor 32; the fifth threshold is slightly greater than the resistance ratio k2 of the third sampling resistor 33 and the first sampling resistor 31; and the fourth threshold is slightly less than the resistance ratio k2 of the third sampling resistor 33 and the first sampling resistor 31. In some embodiments, the value range of the third threshold can be set to be greater than or equal to k1×1.01 and less than or equal to k1×1.1, specifically k1×1.01, k1×1.03, k1×1.05, k1×1.07, or k1×1.1; the value range of the second threshold can be set to be greater than or equal to k1×0.9 and less than or equal to k1×0.99, specifically k1×0.9, k1×0.93, k1×0.95, k1×0.97, or k1×0.99. The fifth threshold can be set to be greater than or equal to k2×1.01 and less than or equal to k2×1.1, specifically k2×1.01, k2×1.03, k2×1.05, k2×1.07 or k2×1.1; the fourth threshold can be set to be greater than or equal to k2×0.9 and less than or equal to k2×0.99, specifically k2×0.9, k2×0.93, k2×0.95, k2×0.97 or k2×0.99.

[0148] like Figure 3 and Figure 16In one embodiment, when the first terminal of the third sampling resistor 33 is electrically connected to the negative terminal of the power supply 110, if there are no faults in the first voltage detection circuit, the second voltage detection circuit, the third voltage detection circuit, and the battery heating circuit, and since the equivalent resistance values ​​of the first sampling resistor 31, the second sampling resistor 32, and the third sampling resistor 33 are all much greater than the equivalent resistance values ​​of the first heating part 21 and the second heating part 22, the resistance of the first heating part 21 or the second heating part 22 in the circuit can be ignored. Therefore, the ratio of the third voltage to the first voltage should theoretically be k2, and the actual measurement result should be greater than or equal to the fourth threshold and less than or equal to the fifth threshold. Therefore, in response to the ratio of the third voltage to the first voltage being less than the fourth threshold or greater than the fifth threshold, a fault detection command is issued. Similarly, when the first terminal of the third sampling resistor 33 is electrically connected to the positive terminal of the power supply 110, in response to the ratio of the difference between the third voltage and the second voltage being less than the second threshold or greater than the third threshold, a fault detection command is issued.

[0149] Setting up a fault detection command trigger process can help improve the reliability of detection results.

[0150] According to some embodiments of this application, before connecting one of the first voltage detection branch and the second voltage detection branch, the heating component 20, the third voltage detection branch and the power supply 110 to form the first circuit S1, the method further includes: in response to receiving a battery heating signal indicating that the battery is to be heated, performing a circuit break detection on the battery heating circuit.

[0151] Setting open-circuit detection in the battery heating circuit as a pre-processing step for heating the battery helps improve the safety and reliability of the battery heating circuit operation.

[0152] According to some embodiments of this application, in response to the closure of the first heating switch K11 and the second heating switch K12, the heating component 20 is in a working state, and the third voltage at both ends of the third voltage detection branch is acquired; based on the third voltage, the circuit breaker detection result of the heating component 20 in the working state is determined.

[0153] Closing the first heating switch K11 and the second heating switch K12 can power on the battery heating circuit and put the heating element 20 into operation.

[0154] The open circuit detection result of the heating component 20 under the working state is determined based on the third voltage, thereby realizing the re-inspection of the heating component 20 and further improving the effectiveness and reliability of the detection result.

[0155] According to some embodiments of this application, determining the open circuit detection result of the heating element 20 under the working state based on the third voltage includes: when the first end of the third sampling resistor 33 is electrically connected to the positive terminal of the power supply 110, determining that the second heating element 22 is open circuit in response to the third voltage being less than or equal to the first threshold; determining that the first heating element 21 is open circuit in response to the third voltage being the power supply voltage; or when the first end of the third sampling resistor 33 is electrically connected to the negative terminal of the power supply 110, determining that the first heating element 21 is open circuit in response to the third voltage being less than or equal to the first threshold; and determining that the second heating element 22 is open circuit in response to the third voltage being the power supply voltage.

[0156] like Figure 3 In one embodiment, with the first terminal of the third sampling resistor 33 electrically connected to the negative terminal of the power supply 110, the first heating switch K11 and the second heating switch K12 are closed, while the first detection switch K21 and the second detection switch K22 are opened. If the first heating element 21 is open-circuited, no current flows through the third voltage detection branch, therefore the third voltage is less than or equal to the first threshold. In some embodiments, when the third voltage is 0, it can be determined that the first heating element 21 is open-circuited. If the second heating element 22 is open-circuited, the current flows sequentially through the positive terminal of the power supply 110 to the first heating element 21, the third sampling resistor 33, and back to the negative terminal of the power supply 110. It should be understood that since the resistance of the third sampling resistor 33 is much greater than the equivalent resistance of the first heating element 21, the third voltage is the power supply voltage, which is also the open-circuit voltage, and its value is approximately equal to the power supply electromotive force. The same logic applies to the case where the first terminal of the third sampling resistor 33 is electrically connected to the positive terminal of the power supply 110.

[0157] Based on the specific value of the third voltage, the fault detection accuracy of the heating component 20 can be limited to the first heating part 21 and the second heating part 22, which is conducive to the re-inspection of the heating component 20 and improves the detection efficiency and reliability.

[0158] This application provides a battery management system, which includes a detection circuit 400 of the battery heating circuit as described in the foregoing embodiments; and a controller, wherein the controller is configured to perform the open circuit detection method as described in the foregoing embodiments.

[0159] In addition to including a detection circuit 400 or a controller for performing the open circuit detection method as described in the foregoing embodiments, a battery management system (BMS) may also include a communication module to enable communication between internal modules of the BMS or between internal modules and external devices. Furthermore, it may include a safety protection module, a battery balancing module, and a data acquisition module. The relevant technical effects have been described above and will not be repeated here.

[0160] This application provides a battery device, which includes the battery management system described in the foregoing embodiments.

[0161] The battery device may include a battery pack and a battery management system. The battery management system is connected to the battery pack to detect the status parameters of the battery pack and control its operating state. The battery pack may include multiple battery cells connected in series and / or in parallel.

[0162] In some examples, the battery device may also include the aforementioned battery heating device for heating the battery pack to provide a suitable ambient temperature. The battery pack may be connected to the battery heating device to supply power to it.

[0163] This application provides an electrical device, including a battery management system as described in the foregoing embodiments, or a battery device as described in the foregoing embodiments.

[0164] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. The relevant technical effects have been explained above and will not be repeated here.

[0165] This application provides an energy storage device, including a battery management system as described in the foregoing embodiments, or a battery device as described in the foregoing embodiments.

[0166] Energy storage equipment refers to a device that can store energy in some form and release the stored energy for use when needed. The energy storage equipment provided in this application embodiment can be an electrochemical energy storage device, such as a sodium-sulfur battery, a lead-acid battery, or a lithium-ion battery. Specifically, the energy storage equipment can be any product form, such as a cabinet-type energy storage device, a containerized energy storage device, a mobile energy storage device, or an outdoor energy storage device, etc. This embodiment does not limit this.

[0167] This application provides a computing device including at least one processor and at least one memory communicatively connected to the at least one processor. The at least one memory stores instructions that, when executed individually or jointly by the at least one processor, cause the computing device to perform the circuit breaker detection method as described in the foregoing embodiments.

[0168] The computing device may include at least one processor, memory, communication interfaces(s), display device, other input / output (I / O) devices, and one or more mass storage devices capable of communicating with each other, such as via a bus or other suitable connection. Instructions are stored in the memory that, when executed by the processor, cause the processor to perform the open-circuit detection method as described in the above embodiments.

[0169] Computing devices can be of various types. Examples of computing devices include, but are not limited to: desktop computers, server computers, laptop or netbook computers, mobile devices (e.g., tablets, cellular or other wireless phones (e.g., smartphones), notebook computers, mobile stations), wearable devices (e.g., glasses, watches), entertainment devices (e.g., entertainment appliances, set-top boxes communicatively coupled to a display device, game consoles), televisions or other display devices, automotive computers, and so on.

[0170] This application provides a computer-readable storage medium storing instructions that, when executed individually or jointly by one or more processors of a computing device, cause the computing device to perform the circuit breaker detection method as described in the foregoing embodiments.

[0171] Computer-readable storage media include volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, DVD, or other optical storage devices, magnetic cassettes, magnetic tapes, disk storage devices or other magnetic storage devices, or any other non-transmission medium that can be used to store information for access by computer equipment.

[0172] This application provides a computer program product including instructions that, when executed individually or jointly by one or more processors of a computing device, cause the computing device to perform the circuit breaker detection method as described in the foregoing embodiments.

[0173] like Figure 3 as well as Figures 13-16As shown, this application embodiment provides a detection circuit 400 for a battery heating circuit. The battery heating circuit includes a first heating switch K11, a heating component 20, and a second heating switch K12 connected in series. The heating component 20 has a first connection terminal P1, a second connection terminal P2, and a third connection terminal P3 located between the first connection terminal P1 and the second connection terminal P2. The heating component 20 includes a first heating part 21 located between the first connection terminal P1 and the third connection terminal P3, and a second heating part 22 located between the third connection terminal P3 and the second connection terminal P2. The first connection terminal P1 is electrically connected to the positive terminal of the power supply 110 through the first heating switch K11, and the second connection terminal P2 is electrically connected to the negative terminal of the power supply 110 through the second heating switch K12.

[0174] The detection circuit 400 includes a first voltage detection branch, a second voltage detection branch, and a third voltage detection branch. The first voltage detection branch includes a first detection switch K21 and a first sampling resistor 31 connected in series. The first terminal of the first voltage detection branch is electrically connected to the positive terminal of the power supply 110, and the second terminal of the first voltage detection branch is electrically connected to the second connection terminal P2. The first voltage detection branch is used to detect a first voltage between the positive terminal of the power supply 110 and the second connection terminal P2. The second voltage detection branch includes a second detection switch K22 and a second sampling resistor 32 connected in series. The first terminal of the second voltage detection branch... The second voltage detection branch is electrically connected to the negative terminal of power supply 110, and the second end of the second voltage detection branch is electrically connected to the first connection terminal P1. The second voltage detection branch is used to detect the second voltage between the negative terminal of power supply 110 and the first connection terminal P1. The third voltage detection branch includes a third detection switch K23 and a third sampling resistor 33 connected in series. The first end of the third voltage detection branch is electrically connected to the positive or negative terminal of power supply 110, and the second end of the third voltage detection branch is electrically connected to the third connection terminal P3. The third voltage detection branch is used to detect the third voltage between the third connection terminal P3 and the negative terminal of power supply 110.

[0175] The method for detecting the open circuit of the battery heating circuit using the detection circuit 400 of this application embodiment is described as follows. Taking the third voltage detection branch for detecting the third voltage between the third connection terminal P3 and the negative terminal of the power supply 110 as an example, the case where the third voltage detection branch is used to detect the third voltage between the third connection terminal P3 and the positive terminal of the power supply 110 is similar and will not be described again.

[0176] like Figure 14As shown, when the first terminal of the third sampling resistor 33 is electrically connected to the negative terminal of the power supply 110, and both the first heating switch K11 and the second heating switch K12 are in the open state, and the first detection switch K21 and the third detection switch K23 are closed. If there is no open circuit fault in the battery heating circuit, the first voltage detection branch, the second heating part 22, and the third voltage detection branch will be successfully energized and connected to the power supply 110 to form the first circuit S1. That is, the current flows through the positive terminal of the power supply 110, sequentially through the first voltage detection branch, the second heating part 22, and the third voltage detection branch, and finally returns to the negative terminal of the power supply 110. In this case, if the third voltage is 0, it is determined that the second heating part 22 of the heating component 20 has an open circuit fault.

[0177] like Figure 15 As shown, when the first terminal of the third sampling resistor 33 is electrically connected to the negative terminal of the power supply 110, and the first detection switch K21, the second detection switch K22, and the second heating switch K12 are all in the open state, and the first heating switch K11 and the third detection switch K23 are closed. If there is no open circuit fault in the battery heating circuit, the first heating switch K11, the first heating part 21, and the third voltage detection branch will be energized and connected to the power supply 110 to form the second circuit S2. That is, the current flows through the positive terminal of the power supply 110, through the first heating switch K11, the first heating part 21, and the third voltage detection branch, and finally returns to the negative terminal of the power supply 110. In this case, if the third voltage is 0, it is determined that the first heating part 21 of the heating component 20 has an open circuit fault.

[0178] like Figure 16 As shown, with the first terminal of the third sampling resistor 33 electrically connected to the negative terminal of the power supply 110, and the first heating switch K11 and the second heating switch K12 in the open state, and the first detection switch K21 and the second detection switch K22 closed. If there is no open circuit fault in the battery heating circuit, the first voltage detection branch, the heating component 20, and the second voltage detection branch connected to the power supply 110 can form a third circuit S3. That is, the current flows through the positive terminal of the power supply 110, sequentially through the first voltage detection branch, the first heating component 21, the second heating component 22, and the second voltage detection branch, and finally returns to the negative terminal of the power supply 110. If the third voltage is greater than 0 and the second voltage is 0, it is determined that the first heating component 21 has an open circuit.

[0179] like Figure 3As shown, with the first terminal of the third sampling resistor 33 electrically connected to the negative terminal of the power supply 110, the first heating switch K11 and the second heating switch K12 are closed, while the first detection switch K21 and the second detection switch K22 are opened. If the first heating part 21 is open-circuited, no current flows through the third voltage detection branch, so the third voltage is 0. If the second heating part 22 is open-circuited, the current flows sequentially through the positive terminal of the power supply 110 to the first heating part 21, the third sampling resistor 33, and back to the negative terminal of the power supply 110. It should be understood that since the resistance of the third sampling resistor 33 is much greater than the equivalent resistance of the first heating part 21, the third voltage is the power supply voltage.

[0180] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A detection circuit for a battery heating circuit, characterized in that, The battery heating circuit includes a first heating switch, a heating element, and a second heating switch connected in series. The heating element has a first connection terminal, a second connection terminal, and a third connection terminal located between the first and second connection terminals. The heating element includes a first heating section located between the first and third connection terminals, and a second heating section located between the third and second connection terminals. The first connection terminal is electrically connected to the positive terminal of the power supply via the first heating switch, and the second connection terminal is electrically connected to the negative terminal of the power supply via the second heating switch. The detection circuit includes: The first voltage detection branch includes a first detection switch and a first sampling resistor connected in series. The first end of the first voltage detection branch is electrically connected to the positive terminal of the power supply, and the second end of the first voltage detection branch is electrically connected to the second connection terminal. The first voltage detection branch is used to detect the first voltage between the positive terminal of the power supply and the second connection terminal. The second voltage detection branch includes a second detection switch and a second sampling resistor connected in series. The first end of the second voltage detection branch is electrically connected to the negative terminal of the power supply, and the second end of the second voltage detection branch is electrically connected to the first connection terminal. The second voltage detection branch is used to detect the second voltage between the negative terminal of the power supply and the first connection terminal. The third voltage detection branch includes a third detection switch and a third sampling resistor connected in series. The first end of the third voltage detection branch is electrically connected to the positive or negative terminal of the power supply. The second end of the third voltage detection branch is electrically connected to the third connection terminal. The third voltage detection branch is used to detect the third voltage between the third connection terminal and the positive or negative terminal of the power supply.

2. The detection circuit of the battery heating circuit according to claim 1, characterized in that, The number of heating elements is multiple, and the multiple heating elements are connected in parallel; and wherein... The third voltage detection branch is configured to detect the third voltage between the positive terminal of the power supply and the third connection terminal of any one of the plurality of heating components, or between the negative terminal of the power supply and the third connection terminal of any one of the plurality of heating components.

3. The detection circuit of the battery heating circuit according to claim 2, characterized in that, There are multiple third voltage detection branches, and each of the multiple third voltage detection branches is connected to a third connection terminal of each of the multiple heating components.

4. The detection circuit of the battery heating circuit according to claim 2, characterized in that, The third voltage detection branch includes multiple third detection switches connected in parallel. The first end of each of the multiple third detection switches is connected to the third sampling resistor, and the second end of each of the multiple third detection switches is connected to the third connection end of each of the multiple heating components.

5. The detection circuit of the battery heating circuit according to any one of claims 1-4, characterized in that, Also includes A processor is signal-connected to the first voltage detection branch, the second voltage detection branch, and the third voltage detection branch. The processor is configured to determine the open circuit detection result of the battery heating circuit based on at least one of the first voltage, the second voltage, and the third voltage.

6. A battery heating assembly, characterized in that, include: A battery heating circuit includes a first heating switch, a heating element, and a second heating switch connected in series. The heating element has a first connection terminal, a second connection terminal, and a third connection terminal located between the first and second connection terminals. The heating element includes a first heating section located between the first and third connection terminals, and a second heating section located between the third connection terminal and the second connection terminal. The first connection terminal is electrically connected to the positive terminal of a power source via the first heating switch, and the second connection terminal is electrically connected to the negative terminal of the power source via the second heating switch. The detection circuit according to any one of claims 1-5 is used to perform open circuit detection on the heating component of the battery heating circuit.

7. The battery heating assembly according to claim 6, characterized in that, The battery heating circuit includes multiple heating elements and multiple third heating switches. Any one of the multiple heating elements is connected in series with the third heating switch and then connected in parallel with the other heating elements. The first voltage detection branch is configured to detect the voltage between the positive terminal of the power supply and the second connection terminal of any one of the plurality of heating components; The second voltage detection branch is configured to detect the voltage between the negative terminal of the power supply and the first connection terminal of any one of the plurality of heating circuits; The third voltage detection branch is configured to detect the voltage between the positive terminal of the power supply and the third connection terminal of any one of the plurality of heating circuits, or the voltage between the negative terminal of the power supply and the third connection terminal of any one of the plurality of heating circuits.

8. The battery heating assembly according to claim 6, characterized in that, The battery heating circuits are multiple, and these multiple battery heating circuits are connected in parallel between the positive terminal and the negative terminal of the power supply, wherein... The first voltage detection branch is configured to detect a first voltage between the positive terminal of the power supply and a second connection terminal of any one of the plurality of battery heating circuits; The second voltage detection branch is configured to detect a second voltage between the negative terminal of the power supply and a first connection terminal of any one of the plurality of battery heating circuits; The third voltage detection branch is configured to detect the third voltage between the positive terminal of the power supply and the third connection terminal of any one of the plurality of battery heating circuits, or between the negative terminal of the power supply and the third connection terminal of any one of the plurality of heating circuits.

9. The battery heating assembly according to claim 8, characterized in that, The number of detection circuits is multiple, and each of the multiple detection circuits is connected to a corresponding battery heating circuit.

10. The battery heating assembly according to claim 8, characterized in that, The first voltage detection branch includes multiple first detection switches connected in parallel. The first terminals of the multiple first detection switches are connected to the first sampling resistor, and the second terminals of the multiple first detection switches are connected one-to-one with the second connection terminals of the multiple battery heating circuits, or the second terminals of the multiple first detection switches are connected to the positive terminal of the power supply. The second voltage detection branch includes multiple second detection switches connected in parallel. The first end of the multiple second detection switches is connected to the second sampling resistor, and the second end of the multiple second detection switches is connected one-to-one with the first connection end of each of the multiple battery heating circuits, or the second end of the multiple second detection switches is connected to the negative terminal of the power supply. The third voltage detection branch includes multiple third detection switches connected in parallel. The first end of each of the multiple third detection switches is connected to the third sampling resistor. The second end of each of the multiple third detection switches is connected to the third connection terminal of each of the multiple battery heating circuits in a one-to-one correspondence. Alternatively, the second end of each of the multiple third detection switches is connected to the positive terminal of the power supply. Or, the second end of each of the multiple third detection switches is connected to the negative terminal of the power supply.

11. The battery heating assembly according to any one of claims 6-10, characterized in that, Also includes: The controller is connected to the battery heating circuit and the detection circuit respectively. The controller is configured to control the battery heating circuit to heat the battery and to control the detection circuit to perform open circuit detection on the battery heating circuit.

12. A method for detecting an open circuit in a battery heating circuit, applied to a detection circuit as described in any one of claims 1-5 or a battery heating assembly as described in any one of claims 6-11, characterized in that, The circuit breaker detection method includes: One of the first voltage detection branch and the second voltage detection branch, the heating component, the third voltage detection branch and the power supply are connected to form a first circuit; Obtain the third voltage across the third voltage detection branch; The open circuit detection result of the battery heating circuit is determined at least based on the third voltage.

13. The open circuit detection method according to claim 12, characterized in that, Connecting one of the first voltage detection branch and the second voltage detection branch, the heating component, the third voltage detection branch, and the power supply to form a first circuit includes: When the first terminal of the third sampling resistor is electrically connected to the positive terminal of the power supply, the second detection switch and the third detection switch are controlled to close. Furthermore, the determination of the open circuit detection result of the battery heating circuit based at least on the third voltage includes: In response to the third voltage being less than or equal to the first threshold, it is determined that the first heating element of the heating component has been disconnected; or When the first terminal of the third sampling resistor is electrically connected to the negative terminal of the power supply, the first detection switch and the third detection switch are controlled to close. Furthermore, the determination of the open circuit detection result of the battery heating circuit based at least on the third voltage includes: In response to the third voltage being less than or equal to the first threshold, it is determined that the second heating element of the heating component has been disconnected.

14. The open circuit detection method according to claim 12 or 13, characterized in that, The circuit breaker detection method further includes: A second circuit is formed by connecting one of the first heating switch and the second heating switch, the heating component, and the third voltage detection branch to the power supply. The third voltage across the third voltage detection branch is obtained again; The open circuit detection result of the heating element is determined at least based on the third voltage obtained again.

15. The open circuit detection method according to claim 14, characterized in that, The step of connecting one of the first heating switch and the second heating switch, the heating component, and the third voltage detection branch to the power supply to form a second circuit includes: When the first terminal of the third sampling resistor is electrically connected to the positive terminal of the power supply, the second heating switch and the third detection switch are controlled to close. Furthermore, the determination of the open circuit detection result of the battery heating circuit based at least on the third voltage obtained again includes: In response to the third voltage being acquired again being less than or equal to the first threshold, it is determined that the second heating element has been disconnected; or When the first terminal of the third sampling resistor is electrically connected to the negative terminal of the power supply, the first heating switch and the third detection switch are controlled to close. Furthermore, the determination of the open circuit detection result of the battery heating circuit based at least on the third voltage obtained again includes: In response to the third voltage being acquired again being less than or equal to the first threshold, it is determined that the first heating element has been disconnected.

16. The open circuit detection method according to claim 12 or 13, characterized in that, The circuit breaker detection method further includes: The first voltage detection branch, the heating element, and the second voltage detection branch are connected to the power supply to form a third circuit; and Obtain the first voltage across the first voltage detection branch and / or the second voltage across the second voltage detection branch; Furthermore, determining the open-circuit detection result of the battery heating circuit based at least on the third voltage includes: The open circuit detection result of the heating element is determined based on at least one of the first voltage and the second voltage, as well as the third voltage.

17. The open circuit detection method according to claim 16, characterized in that, The determination of the open circuit detection result of the battery heating circuit based on at least one of the first voltage and the second voltage, and the third voltage, includes: When the first terminal of the third sampling resistor is electrically connected to the positive terminal of the power supply, In response to the third voltage being greater than a first threshold and the first voltage being less than or equal to the first threshold, it is determined that the second heating element has been disconnected; or When the first terminal of the third sampling resistor is electrically connected to the negative terminal of the power supply, In response to the third voltage being greater than the first threshold and the second voltage being less than or equal to the first threshold, it is determined that the first heating element has been disconnected.

18. The open circuit detection method according to claim 12 or 13, characterized in that, The method further includes: With the first terminal of the third sampling resistor electrically connected to the positive terminal of the power supply, the second voltage is obtained; In response to the ratio of the third voltage to the second voltage being less than a second threshold or greater than a third threshold, a fault detection command is issued; the third threshold is greater than the second threshold. or The first voltage is obtained when the first terminal of the third sampling resistor is electrically connected to the negative terminal of the power supply; In response to the ratio of the third voltage to the first voltage being less than a fourth threshold or greater than a fifth threshold, a fault detection command is issued; the fifth threshold is greater than the fourth threshold.

19. The open circuit detection method according to claim 12 or 13, characterized in that, Before connecting one of the first voltage detection branch and the second voltage detection branch, the heating component, the third voltage detection branch, and the power supply to form a first circuit, the method further includes: In response to receiving a battery heating signal indicating that the battery should be heated, an open circuit detection is performed on the battery heating circuit.

20. The open circuit detection method according to claim 12 or 13, characterized in that, Also includes: In response to the closure of the first heating switch and the second heating switch, the heating component is in working state and acquires the third voltage across the third voltage detection branch; The open circuit detection result of the heating component under the working state is determined based on the third voltage.

21. The open circuit detection method according to claim 20, characterized in that, The open circuit detection result of the heating component under the operating state determined based on the third voltage includes: When the first terminal of the third sampling resistor is electrically connected to the positive terminal of the power supply, In response to the third voltage being less than or equal to the first threshold, it is determined that the second heating element has been disconnected; In response to the fact that the third voltage is the power supply voltage, it is determined that the first heating element has been disconnected; or When the first terminal of the third sampling resistor is electrically connected to the negative terminal of the power supply, In response to the third voltage being less than or equal to the first threshold, it is determined that the first heating element has been disconnected; In response to the third voltage being the power supply voltage, it is determined that the second heating element has been disconnected.

22. A battery management system, characterized in that, include: The detection circuit of the battery heating circuit as described in any one of claims 1-5; as well as The controller is configured to perform the circuit breaker detection method as described in any one of claims 12-21.

23. A battery device, characterized in that, Includes the battery management system as described in claim 22.

24. An electrical appliance, characterized in that, This includes the battery management system as described in claim 22, or the battery device as described in claim 23.

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