Heating film detection method, device, equipment, medium and product

Abstract

The present application discloses a heating film detection method, device, equipment, medium and product. The method includes: obtaining a first voltage value and a second voltage value in a battery circuit, wherein the first voltage value is used to indicate a voltage parameter of a first circuit, and the second voltage value is used to indicate a voltage parameter of a second circuit. The battery includes n single cells connected in series in sequence, the first circuit includes the first to the i-th single cells and the circuit to which the heating film belongs, and the second circuit includes the j-th to the n-th single cells and the circuit to which the heating film belongs, 1≤i≤j≤n; if the first voltage value is greater than the first preset threshold value, it is determined that the heating film fault position is close to the n-th single cell; if the second voltage value is greater than the second preset threshold value, it is determined that the heating film fault position is close to the 1st single cell. According to the embodiment of the present application, the problem of misjudgment or missed judgment of the short-circuit fault of the heating film can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a heating film detection method, device, equipment, medium and product. Background Art

[0002] When the ambient temperature is low, the battery has poor charging and discharging capabilities, the viscosity of the electrolyte decreases, and the conductivity decreases, which not only easily affects its service life, but also poses a greater safety hazard. Therefore, battery manufacturers usually install heating films to preheat the battery, which can not only increase the service life of the battery, but also ensure better charging and discharging.

[0003] The heating film is usually connected in parallel with a high-voltage circuit including a main positive branch and a main negative branch. However, this connection method may cause the heating film to be short-circuited with the battery, which poses a serious safety risk.

[0004] However, in the related art, the detection of short-circuit faults of the heating film is prone to misjudgment or missed judgment. Summary of the invention

[0005] The embodiments of the present application provide a heating film detection method, device, equipment, medium and product, which can improve the detection of short-circuit faults of heating films in related technologies, which are prone to misjudgment or missed judgment.

[0006] In a first aspect, an embodiment of the present application provides a heating film detection method, comprising: obtaining a first voltage value and a second voltage value in a battery circuit, wherein the first voltage value is used to indicate a voltage parameter of a first circuit, and the second voltage value is used to indicate a voltage parameter of a second circuit, the battery comprises n single cells connected in series in sequence, the first circuit comprises the first to the i-th single cells and the circuit to which the heating film belongs, the second circuit comprises the j-th to the n-th single cells and the circuit to which the heating film belongs, 1≤i≤j≤n; according to the first voltage value and the second voltage value, determine whether the heating film has a short circuit fault.

[0007] In the embodiment of the present application, if the short-circuit fault position is relatively close to the first single cell, the first voltage value will be relatively small, and the second voltage value will be relatively large; if the short-circuit fault position is relatively close to the nth single cell, the first voltage value will be relatively large, and the second voltage value will be relatively small; affected by the sampling accuracy of the voltage sampling device, the smaller voltage value may not be detected. In the embodiment of the present application, instead of obtaining the voltage at only one position, two voltage values ​​indicating the first circuit and the second circuit are obtained. When the short-circuit fault position is close to the first single cell or close to the nth single cell, the larger voltage value can be detected. This can avoid being affected by the sampling accuracy of the voltage sampling device, thereby improving the problem of misjudgment or missed judgment of the short-circuit fault of the heating film.

[0008] In some embodiments of the first aspect, obtaining a first voltage value and a second voltage value in a battery circuit includes: controlling a main negative switch in a main circuit to be in a closed state, and controlling a main positive switch in the main circuit to be in an open state to form a first circuit, and obtaining a first voltage value corresponding to the first circuit; controlling a main negative switch in the main circuit to be in an open state, and controlling a main positive switch in the main circuit to be in a closed state to form a second circuit, and obtaining a second voltage value corresponding to the second circuit.

[0009] In the embodiment of the present application, when the main negative switch is closed and the main positive switch is disconnected, for example, there is a short circuit fault between the heating film and the i-th single cell, the 1st single cell to the i-th single cell and the main negative switch constitute a first circuit, so that the first voltage value corresponding to the first circuit can be accurately obtained. When the main negative switch is disconnected and the main positive switch is closed, for example, there is a short circuit fault between the heating film and the j-th single cell, the j-th single cell to the n-th single cell and the main positive switch constitute a second circuit, so that the second voltage value corresponding to the second circuit can be accurately obtained. In addition, when obtaining the first voltage value and the second voltage value, in the embodiment of the present application, one of the main positive switch and the main negative switch is disconnected and the other is closed, so as to avoid damage to the device caused by the simultaneous closure of both.

[0010] In some embodiments of the first aspect, the branch to which the heating film belongs further includes a third switch; the third switch is connected between the heating film and the main positive switch, controls the main negative switch in the main circuit to be in an open state, and controls the main positive switch in the main circuit to be in a closed state to form a second circuit, and obtains a second voltage value corresponding to the second circuit, including: controlling the main negative switch in the main circuit to be in an open state, and controlling the main positive switch and the third switch in the main circuit to be in a closed state, so as to form a second circuit. And obtain the second voltage value corresponding to the second circuit; or, the third switch is connected between the heating film and the main negative switch, controls the main negative switch in the main circuit to be in a closed state, and controls the main positive switch in the main circuit to be in an open state, so as to form a first circuit, and obtain the first voltage value corresponding to the first circuit, including: controlling the main negative switch and the third switch in the main circuit to be in a closed state, and controlling the main positive switch in the main circuit to be in an open state to form a first circuit, and obtain the first voltage value corresponding to the first circuit.

[0011] In the embodiment of the present application, there may be a heating mode switch, i.e., a third switch, in the branch where the heating film is located. When the third switch is connected between the heating film and the main positive switch, the third switch belongs to the second circuit. When obtaining the second voltage value corresponding to the second circuit, the third switch is controlled to be closed, which can ensure that the second circuit belongs to the passage, thereby obtaining the second voltage value. When the third switch is connected between the heating film and the main negative switch, the third switch belongs to the first circuit. When obtaining the first voltage value corresponding to the first circuit, the third switch is controlled to be closed, which can ensure that the first circuit belongs to the passage, thereby obtaining the first voltage value.

[0012] In some embodiments of the first aspect, determining whether the heating film is faulty is determined based on the first voltage value and the second voltage value, including: if the first voltage value is greater than a first preset threshold, or the second voltage value is greater than a second preset threshold, determining that the heating film is faulty.

[0013] In the absence of a short circuit fault, when obtaining the first voltage value, the first circuit is actually disconnected, so the first voltage value is basically zero. Similarly, in the absence of a short circuit fault, when obtaining the second voltage value, the second circuit is actually disconnected, so the second voltage value is basically zero. In the presence of a short circuit fault, the location of the short circuit fault is either relatively close to the first single cell or relatively close to the last (nth) single cell, and one of the first voltage value and the second voltage value will be relatively larger. In the embodiment of the present application, both situations are taken into account, the first voltage value and the second voltage value are obtained, and the first voltage value is compared with the first preset threshold value, and the second voltage value is compared with the second preset threshold value. If one of the two is greater than its corresponding threshold value, it can be determined that there is a short circuit fault in the battery, avoiding the problem of misjudgment or missed judgment of the fault.

[0014] In some embodiments of the first aspect, the first preset threshold is equal to the second preset threshold.

[0015] In the embodiment of the present application, when the first preset threshold is equal to the second preset threshold, when fault judgment is performed based on the first voltage value and the second voltage value, the same judgment basis is used to ensure the accuracy of the fault judgment, and the two thresholds are equal. This is equivalent to designing only one threshold during design, which is relatively simple.

[0016] In some embodiments of the first aspect, the method also includes: if the first voltage value is greater than a first preset threshold, determining that the heating film fault position is close to the nth battery cell; if the second voltage value is greater than a second preset threshold, determining that the heating film fault position is close to the 1st battery cell.

[0017] In the embodiment of the present application, by comparing the first voltage value with the first preset threshold value and the second voltage value with the second preset threshold value respectively, the specific location of the short circuit fault between the single cells in the battery can be accurately determined, which facilitates the subsequent operations of the technicians.

[0018] In some embodiments of the first aspect, the method also includes: obtaining a current voltage value of the battery; obtaining a first resistance of the heating film; in the event of a fault in the heating film, obtaining a second resistance between the heating film and the outer shell of the single cell and a third resistance between the outer shell of the single cell and the positive pole of the single cell; determining a first preset threshold value and a second preset threshold value based on the current voltage value, the first resistance, the second resistance and the third resistance.

[0019] In the embodiment of the present application, the first preset threshold and the second preset threshold are determined in combination with the current voltage value, the first resistor, the second resistor and the third resistor, so that the judgment result of whether there is a short circuit fault between the single cells in the battery can be more accurate.

[0020] In some embodiments of the first aspect, determining the first preset threshold and the second preset threshold according to the current voltage value, the first resistor, the second resistor, and the third resistor includes: determining the first preset threshold and the second preset threshold according to the following formula:

[0021]

[0022] Among them, U1' represents the first preset threshold, U2' represents the second preset threshold, U represents the current voltage value, R1 represents the first resistor, R2 represents the second resistor, and R3 represents the third resistor.

[0023] In an embodiment of the present application, the first preset threshold value and the second preset threshold value calculated based on the median voltage in the battery circuit and the ratio of the resistance at the midpoint of the heating film to the corresponding single cell can make the judgment result of whether there is a short circuit fault between the single cells in the battery more accurate.

[0024] In some embodiments of the first aspect, the method further includes: if the first voltage value is less than or equal to a first preset threshold, and the second voltage value is less than or equal to a second preset threshold, determining that the heating film is not faulty.

[0025] In the embodiment of the present application, if the first voltage value is less than or equal to the first preset threshold value, and the second voltage value is less than or equal to the second preset threshold value, it is possible to detect whether there is a short circuit fault between the heating film and the single cell in the battery.

[0026] In the second aspect, an embodiment of the present application provides a heating film detection device, the device comprising: an acquisition module, used to acquire a first voltage value and a second voltage value in a battery circuit, wherein the first voltage value is used to indicate a voltage parameter of a first circuit, and the second voltage value is used to indicate a voltage parameter of a second circuit, the battery comprises n single cells connected in series in sequence, the first circuit comprises the first to the i-th single cells and the circuit to which the heating film belongs, the second circuit comprises the j-th to the n-th single cells and the circuit to which the heating film belongs, 1≤i≤j≤n; a determination module, used to determine whether the heating film has a fault based on the first voltage value and the second voltage value.

[0027] In a third aspect, an embodiment of the present application provides a heating film detection device, the device comprising: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, a heating film detection method in the first aspect or any one of the embodiments of the first aspect is implemented.

[0028] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the heating film detection method in the first aspect or any one of the embodiments of the first aspect is implemented.

[0029] In a fifth aspect, an embodiment of the present application provides a computer program product. When instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes a heating film detection method such as the first aspect or any one of the embodiments of the first aspect.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features and the accompanying drawings are not drawn to scale.

[0032] Figure 1 A simplified electrical principle schematic diagram showing a single cell battery product including a heating film provided in an embodiment of the present application in the case of a short circuit fault;

[0033] Figure 2 A simplified electrical schematic diagram of a battery product provided by an embodiment of the present application and including a plurality of single cells connected in series and including a heating film is shown;

[0034] Figure 3 A schematic flow chart of a heating film detection method provided by an embodiment of the present application is shown;

[0035] Figure 4a A simplified electrical schematic diagram of a battery product provided by an embodiment of the present application showing a short circuit fault in the case where multiple single cells including a heating film are connected in series;

[0036] Figure 4b A circuit diagram showing a battery product provided by an embodiment of the present application in which a plurality of single cells including a heating film are connected in series and a short circuit fault occurs;

[0037] Figure 5 A schematic diagram of a flow chart of an implementation method for obtaining a voltage value provided by an embodiment of the present application is shown;

[0038] Figure 6 A schematic flow chart of a heating film detection method provided by an embodiment of the present application is shown;

[0039] Figure 7 A schematic flow chart of another heating film detection method provided by an embodiment of the present application is shown;

[0040] Figure 8 A schematic flow chart of another heating film detection method provided by an embodiment of the present application is shown;

[0041] Fig. 9 A schematic flow chart of another heating film detection method provided by an embodiment of the present application is shown;

[0042] Fig.10 A schematic diagram showing a structure of a heating film detection device provided in an embodiment of the present application is shown;

[0043] Fig.11 A schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] As people's demand for renewable energy and clean energy continues to increase, batteries have gradually become indispensable in various technical fields. However, in low temperature environments, the viscosity of the electrolyte in the battery decreases and the conductivity decreases, resulting in poor battery charging and discharging capabilities, affecting its service life and possibly causing major safety hazards. Therefore, battery manufacturers usually use the method of installing a heating film to preheat the battery to ensure that the battery has better charging and discharging performance and a longer service life.

[0052] In the related art, battery manufacturers usually connect the heating film in parallel with the main circuit of the battery, where the main circuit includes a main positive branch and a main negative branch. However, this connection method may cause the heating film and the battery to be short-circuited, which poses a serious safety risk. Figure 1 A simplified electrical schematic diagram is shown in which a single cell battery product including a heating film provided in an embodiment of the present application has a short circuit fault. Figure 1 As shown, the metal wire in the heating film 105 may be connected to the conductive technology particles or electrolyte on the shell 103 of the single battery 10, thereby causing the heating film to be short-circuited with the battery. At this time, the flow direction of the short-circuit current in the circuit can be the negative electrode 101->electrolyte in the battery 10->positive electrode 102 of the battery 10->positive electrode to shell resistance R3->shell 103->heating film short-circuit position 104->heating film 105. Among them, there can be another resistor between the negative electrode of the battery 10 and the shell of the battery 10, that is, the negative electrode to shell resistance R5. When the battery is provided with a sufficiently large voltage, it may cause the shell resistance to break down and burn, and the electrolyte will react violently under a large voltage, resulting in the risk of a heat runaway reaction chain. Therefore, in order to avoid the safety hazards caused by the short circuit of the heating film, the relevant technology can monitor the circuit parameters of the branch to which the heating film belongs, such as monitoring the voltage value between the short-circuit position of the heating module and the main positive electrode of the battery cell, to determine whether there is a short-circuit fault between the heating film and the battery.

[0053] In order to meet the power demand of users and increase the service life and high load demand of electrical equipment, in the related technology, technicians connect multiple single cells in series to provide higher voltage and larger battery capacity for electrical equipment. It is understandable that at this time, it is very necessary to monitor the safety status of the battery with multiple single cells connected in series, that is, to monitor whether there is a short circuit between the heating film and the single battery in the battery with multiple single cells connected in series. Figure 2 A simplified electrical schematic diagram of a battery product provided by an embodiment of the present application and including a plurality of single cells connected in series and including a heating film is shown. Figure 2As shown, a battery product with multiple single cells connected in series can be C1, C2, C3, ..., Cn single cells connected in series. Among them, the shells of each single cell are isolated from each other. In addition, the heating film 105 in the battery product can be composed of a resistance wire 106 and a polyimide film (PI) film 107. Among them, the resistance wire 106 can be located under each single cell to heat the single cell. The PI film 107 has a good insulation effect and can be used to be installed between the single cell and the resistance wire to avoid a short circuit problem between the resistance wire 106 and the single cell. It can be understood that the PI film can be fixed to the single cell by a thermal pad 108, or the PI film can be fixed to the single cell by a glue with a good thermal conductivity. Therefore, when the PI film 107 is damaged, a short circuit may occur between the resistance wire and the single cell. However, if the specific short-circuit position between the heating film and the battery is to be determined, a sampling point needs to be set at the outer shell of each single battery cell to determine the specific position of the short circuit. It is understandable that the structure of this method is relatively complex, and it is not easy to determine the specific short-circuit position of the heating film. In the related art, the specific position of the short-circuit fault point can also be determined by obtaining the voltage value between the short-circuit position of the heating module and the main positive of the single battery cell. However, this method basically cannot detect the voltage when the short-circuit position is close to the main negative of the single battery cell, and there is a problem of misjudgment or missed judgment. Therefore, how to conveniently and accurately determine the specific short-circuit position between the heating film and the battery is a problem that needs to be solved urgently by relevant technical personnel.

[0054] In order to solve the above technical problems, the embodiments of the present application provide a heating film detection method, device, equipment, medium and product, which will be described below in conjunction with the accompanying drawings.

[0055] The following first introduces a heating film detection method provided in an embodiment of the present application.

[0056] Figure 3 A schematic diagram of a heating film detection method provided by an embodiment of the present application is shown. Figure 3 As shown, the heating film detection method provided in the embodiment of the present application may include the following steps:

[0057] S310, obtaining a first voltage value and a second voltage value in a battery circuit.

[0058] S320: Determine whether the heating film has a fault according to the first voltage value and the second voltage value.

[0059] Among them, the first voltage value is used to indicate the voltage parameter of the first circuit, the second voltage value is used to indicate the voltage parameter of the second circuit, the battery includes n single cells connected in series in sequence, the first circuit includes the first to the i-th single cells and the circuit to which the heating film belongs, the second circuit includes the j-th to the n-th single cells and the circuit to which the heating film belongs, 1≤i≤j≤n.

[0060] Exemplarily, the battery circuit may include: a main circuit connected to the battery and a branch circuit connected to the main circuit to which the heating film belongs, wherein the main circuit connected to the battery and the branch circuit connected to the main circuit to which the heating film belongs may be connected in parallel.

[0061] Exemplarily, the first loop may be a loop consisting of the first battery cell, the second battery cell, ..., to the i-th battery cell and the heating film, wherein the value of i may be determined by the short-circuit fault point between the heating film and the battery cell.

[0062] Exemplarily, the second loop may be a loop consisting of the jth single cell, the j+1th single cell, ..., to the nth single cell and the heating film. The jth single cell may be a single cell after the ith single cell in the battery, that is, i≤j. Moreover, the value of j may be determined by the short-circuit fault point between the heating film and the single cell.

[0063] In one example, if the battery is composed of 10 single cells connected in series, for example, the short circuit fault location is in the fifth single cell, then the first circuit can be a circuit composed of the first single cell to the fifth single cell and the heating film; the second circuit can be a circuit composed of the fifth single cell to the tenth single cell and the heating film.

[0064] For example, the first voltage value may be a voltage value corresponding to the first circuit, and the second voltage value may be a voltage value corresponding to the second circuit. Furthermore, by obtaining the first voltage value corresponding to the first circuit and the second voltage value corresponding to the second circuit, it can be determined whether there is a short circuit fault between the single cell and the heating film in the battery.

[0065] In one example, Figure 4a A simplified electrical schematic diagram of a battery product provided by an embodiment of the present application showing a short circuit fault in the case of multiple single cells in series with a heating film, as shown in FIG. Figure 4aAs shown, a battery product with multiple single cells connected in series can be a single cell C1, a single cell C2, a single cell C3, and a single cell C4 connected in series in sequence. Among them, the main circuit can be a circuit consisting of a main negative switch 110, a series of single cells C1-C4, and a main positive switch 111. The heating film 105 and the heating film relay 109 are connected in parallel with the main circuit to form a branch of the battery product. Among them, there is a short-circuit fault point 112 between the single cell C3 and the heating film. At this time, the first circuit can be a circuit consisting of a single cell C1, a single cell C2, and a short-circuit fault point 112 between the single cell C3 and the heating film. The second circuit can be a circuit consisting of a short-circuit fault point between the single cell C3 and the heating film and a single cell C4. Among them, the battery product can also include a fuse 113, which is connected between the heating film relay 109 and the main positive switch 111, which can provide higher reliability for the battery product.

[0066] Furthermore, Figure 4b A circuit diagram of a battery product provided by an embodiment of the present application in which a plurality of single cells including a heating film are connected in series and a short circuit occurs, such as Figure 4b As shown, the first voltage value U1 may represent the voltage value between the short-circuit fault point 112 between the single cell C1 and the single cell C3. Also, the second voltage value U2 may represent the voltage value between the short-circuit fault point 112 between the single cell C3 and the heating film and the single cell C4.

[0067] Exemplarily, the first voltage value can be calculated by the following formula:

[0068] (1)

[0069] Among them, U1 can represent the first voltage value, Us1 can be the voltage value between the short-circuit fault point between the heating film and the single cell to the first single cell; R4 can be the impedance between the short-circuit fault point of the heating film and the negative electrode of the heating film, wherein the negative electrode of the heating film can be the end of the heating film connected to the main negative of the single cell; R2 can be the impedance between the short-circuit fault point of the heating film and the outer shell of the single cell with a short circuit; R3 can be the equivalent resistance between the positive electrode of the single cell with a short-circuit fault and its outer shell, that is, the positive electrode to shell resistance.

[0070] Exemplarily, the second voltage value can be calculated by the following formula:

[0071] (2)

[0072] Among them, U2 can represent the second voltage value, Us2 can be the voltage value between the short-circuit fault point between the heating film and the single cell to the nth single cell; R5 can be the impedance between the short-circuit fault point of the heating film and the positive electrode of the heating film, wherein the positive electrode of the heating film can be the end of the heating film connected to the main positive of the single cell; R2 can be the impedance between the short-circuit fault point of the heating film and the outer shell of the single cell with a short circuit; R3 can be the equivalent resistance between the positive electrode of the single cell with a short circuit and its outer shell, that is, the positive electrode to shell resistance.

[0073] It can be understood that, according to the above formula (1) and formula (2), the main factor affecting the magnitude of the first voltage value and the second voltage is the voltage value between the short-circuit fault point between the heating film and the single cell and the single cell, that is, the magnitude of Us1 and Us2 is the main factor affecting the magnitude of U1 and U2. Therefore, if the short-circuit fault point is closer to the first single cell, Us1 is smaller and Us2 is larger. At this time, the voltage value of the first voltage corresponding to the first circuit is smaller, while the second voltage value corresponding to the second circuit is larger. Conversely, if the short-circuit fault point is farther away from the first single cell, Us1 is larger and Us2 is smaller. At this time, the voltage value of the first voltage corresponding to the first circuit is larger, while the second voltage value corresponding to the second circuit is smaller. Therefore, it is possible to determine whether there is a short-circuit fault between the single cells in the battery by the magnitude of the first voltage value and the second voltage value.

[0074] In the embodiment of the present application, if the short-circuit fault position is relatively close to the first single cell, the first voltage value will be relatively small, and the second voltage value will be relatively large; if the short-circuit fault position is relatively close to the nth single cell, the first voltage value will be relatively large, and the second voltage value will be relatively small; affected by the sampling accuracy of the voltage sampling device, the smaller voltage value may not be detected. In the embodiment of the present application, instead of obtaining the voltage at only one position, two voltage values ​​indicating the first circuit and the second circuit are obtained. When the short-circuit fault position is close to the first single cell or the nth single cell, the larger voltage value can be detected. This can avoid being affected by the sampling accuracy of the voltage sampling device, thereby improving the problem of misjudgment or missed judgment of the short-circuit fault of the heating film.

[0075] In order to obtain the first voltage value and the second voltage value conveniently and accurately, as another implementation method in the application embodiment, the present application also provides an implementation method for obtaining the first voltage value and the second voltage value in the battery circuit, please refer to the following embodiments for details.

[0076] Figure 5 A schematic diagram of a process for obtaining a voltage value according to an embodiment of the present application is shown. Figure 5 As shown, an implementation method for obtaining a voltage value provided in an embodiment of the present application may include the following steps:

[0077] S311, controlling a main negative switch in the main loop to be in a closed state, and controlling a main positive switch in the main loop to be in an open state, so as to form a first loop, and obtaining a first voltage value corresponding to the first loop.

[0078] Exemplarily, the first circuit formed by the battery circuit can be controlled by controlling the main negative switch in the main circuit to be in a closed state and the main positive switch to be in an open state. It can be understood that the first circuit can include: the negative pole of the single cell short-circuited with the heating module -> main negative switch -> one end of the heating film connected to the main negative switch -> the short-circuited position of the heating film -> the outer shell of the single cell -> the positive pole of the single cell.

[0079] S312, controlling the main negative switch in the main loop to be in an open state, and controlling the main positive switch in the main loop to be in a closed state, so as to form a second loop, and obtaining a second voltage value corresponding to the second loop.

[0080] Exemplarily, the second circuit formed by the battery can be controlled by controlling the main negative switch in the main circuit to be in an open state and the main positive switch to be in a closed state. It can be understood that the second circuit can include: the positive pole of the single cell short-circuited with the heating module -> main positive switch -> one end of the heating film connected to the main positive switch -> the short-circuited position of the heating film -> the outer shell of the single cell -> the positive pole of the single cell.

[0081] For example, by controlling the states of the main positive switch and the main negative switch, including the closed state and the open state, the entire battery circuit is divided into two parts according to the short-circuit position. By obtaining the voltage values ​​corresponding to the two parts respectively, it is possible to determine which side the short-circuit fault in the battery is close to based on the obtained voltage values.

[0082] Exemplarily, the main positive switch includes but is not limited to a main positive relay; the main negative switch includes but is not limited to a main negative relay.

[0083] Exemplarily, the main positive switch and the main negative switch may be controlled by a processor.

[0084] In the embodiment of the present application, there may be a third switch in the battery circuit. And the acquisition of the first voltage value and the second voltage value can be achieved by controlling the state of the third switch. The third switch may be a switch located in the branch where the heating film is located.

[0085] Exemplarily, the third switch may be located between the heating film and the main positive switch. In one example, when the third switch is located between the heating film and the main positive switch, the main negative switch in the main circuit may be controlled to be in an open state, and the main positive switch and the third switch in the main circuit may be controlled to be in a closed state, thereby forming a second circuit in the battery circuit, and then obtaining a second voltage value corresponding to the second circuit.

[0086] Exemplarily, the third switch can heat the space between the membrane and the main negative switch. In one example, when the third switch can heat the space between the membrane and the main negative switch, the main negative switch and the third switch in the main circuit can be controlled to be in a closed state, and the main positive switch in the main circuit can be in an open state, thereby forming a first circuit in the battery circuit, and then the first voltage value corresponding to the first circuit can be obtained.

[0087] Exemplarily, the third switch includes, but is not limited to, a heating film relay.

[0088] Exemplarily, the third switch may be controlled by a relevant technician, or may be controlled by a processor.

[0089] In the embodiment of the present application, when the third switch is connected between the heating film and the main positive switch, the third switch belongs to the second circuit. When obtaining the second voltage value corresponding to the second circuit, the third switch is controlled to be closed, which can ensure that the second circuit belongs to the passage, thereby obtaining the second voltage value. When the third switch is connected between the heating film and the main negative switch, the third switch belongs to the first circuit. When obtaining the first voltage value corresponding to the first circuit, the third switch is controlled to be closed, which can ensure that the first circuit belongs to the passage, thereby obtaining the first voltage value.

[0090] In the embodiment of the present application, when the main negative switch is closed and the main positive switch is disconnected, for example, there is a short circuit fault between the heating film and the i-th single cell, the 1st single cell to the i-th single cell and the main negative switch constitute a first circuit, so that the first voltage value corresponding to the first circuit can be accurately obtained. When the main negative switch is disconnected and the main positive switch is closed, for example, there is a short circuit fault between the heating film and the j-th single cell, the j-th single cell to the n-th single cell and the main positive switch constitute a second circuit, so that the second voltage value corresponding to the second circuit can be accurately obtained. In addition, when obtaining the first voltage value and the second voltage value, in the embodiment of the present application, one of the main positive switch and the main negative switch is disconnected and the other is closed, so as to avoid damage to the device caused by the simultaneous closure of both.

[0091] Figure 6 A schematic diagram of a heating film detection method provided by an embodiment of the present application is shown. Figure 6 As shown, the heating film detection method provided in the embodiment of the present application may include the following steps:

[0092] S610: Acquire a first voltage value and a second voltage value in a battery circuit.

[0093] Exemplarily, step S610 is consistent with step S310, and will not be described in detail here.

[0094] S620: If the first voltage value is greater than the first preset threshold, or the second voltage value is greater than the second preset threshold, it is determined that the heating film is faulty.

[0095] Exemplarily, the first preset voltage value may be equal to the second preset voltage value. It is understandable that when the first preset threshold value is equal to the second preset threshold value, when the fault judgment is performed according to the first voltage value and the second voltage value, the same judgment basis is used to ensure the accuracy of the fault judgment, and the two threshold values ​​are equal, which is equivalent to designing only one threshold value during design, which is relatively simple.

[0096] Exemplarily, when the first voltage value is greater than the first preset threshold, it can be determined that there is a short circuit fault between the heating film and the single cell in the battery. In one example, when the first voltage value is greater than the first preset threshold and the second voltage value is less than the preset second threshold, it can be determined that there is a short circuit fault between the heating film and the single cell in the battery.

[0097] Exemplarily, when the second voltage value is greater than the second preset threshold, it can be determined that there is a short circuit fault between the heating film and the single cell in the battery. In one example, when the second voltage value is greater than the second preset threshold and the first voltage threshold is less than the first preset threshold, it can be determined that there is a short circuit fault between the heating film and the single cell in the battery.

[0098] In the embodiment of the present application, in the absence of a short circuit fault, when obtaining the first voltage value, the first circuit is actually disconnected, so the first voltage value is substantially zero. Similarly, in the absence of a short circuit fault, when obtaining the second voltage value, the second circuit is actually disconnected, so the second voltage value is substantially zero. In the case of a short circuit fault, the location of the short circuit fault is either relatively close to the first single cell or relatively close to the last (nth) single cell, and one of the first voltage value and the second voltage value will be relatively larger. In the embodiment of the present application, both situations are taken into account, the first voltage value and the second voltage value are obtained, and the first voltage value is compared with the first preset threshold value, and the second voltage value is compared with the second preset threshold value. If one of the two is greater than its corresponding threshold value, it can be determined whether there is a short circuit fault in the battery, avoiding the problem of misjudgment or missed judgment of the fault.

[0099] Figure 7 A schematic diagram of a flow chart of another heating film detection method provided by an embodiment of the present application is shown. Figure 7As shown, the heating film detection method provided in the embodiment of the present application may include the following steps:

[0100] S710: Acquire a first voltage value and a second voltage value in a battery circuit.

[0101] Exemplarily, step S710 is consistent with step S310, and will not be described in detail here.

[0102] S720: If the first voltage value is greater than the first preset threshold, it is determined that the fault position of the heating film is close to the nth battery cell; if the second voltage value is greater than the second preset threshold, it is determined that the fault position of the heating film is close to the first battery cell.

[0103] Exemplarily, when the first voltage value is greater than the first preset threshold value, and the second voltage value is less than the preset threshold value, it can be determined that the short circuit fault position between the heating film and the battery is close to the nth single cell. When the second voltage value is greater than the second preset threshold value, and the first voltage value is less than the first preset voltage threshold value, it can be determined that the short circuit fault position between the heating film and the battery is close to the first single cell.

[0104] In one example, combining formula (1) and formula (2), it can be known that the main factor affecting the first voltage value and the second voltage value may be the voltage value between the short-circuit fault point between the heating film and the single cell to the first or nth single cell. It can be understood that if the short-circuit fault point is closer to the first single cell, the voltage between the short-circuit fault point and the first single cell is smaller, that is, the first voltage value is smaller. And, at this time, the short-circuit fault point is far from the nth single cell, and the voltage between the short-circuit fault point and the nth single cell is larger, that is, the second voltage value is larger. Similarly, when the short-circuit fault point is far from the first single cell, the first voltage value is larger and the second voltage value is smaller.

[0105] For example, by comparing the first voltage value with the first preset threshold value and the second voltage value with the second preset threshold value, the specific location of the short circuit fault between the single cells in the battery can be accurately determined, which facilitates subsequent operations for technicians.

[0106] Figure 8 FIG. 1 is a flow chart of another heating film detection method provided by an embodiment of the present application. Figure 8 As shown, the heating film detection method provided in the embodiment of the present application may include the following steps:

[0107] S810. Acquire a first voltage value and a second voltage value in a battery circuit.

[0108] Exemplarily, step S810 is consistent with step S310, and will not be described in detail here.

[0109] S820: Obtain the current voltage value of the battery.

[0110] Exemplarily, the current voltage value of the battery may be the voltage value between the 1st single cell to the nth single cell.

[0111] S830, obtaining a first resistance of the heating film.

[0112] Exemplarily, the first resistor may be an impedance corresponding to the heating film.

[0113] S840: When the heating film fails, obtain a second resistance between the heating film and the outer shell of the single cell and a third resistance between the outer shell of the single cell and the positive electrode of the single cell.

[0114] For example, the second resistor may be the resistance between the housing of the single cell with a short circuit fault and the heating film, that is, R2 in the above formula. The third resistor may be the resistance between the housing of the single cell with a short circuit fault and the positive electrode of the single cell, that is, R3 in the above formula.

[0115] S850, determining a first preset threshold and a second preset threshold according to the current voltage value, the first resistor, the second resistor, and the third resistor.

[0116] Exemplarily, the first preset threshold and the second preset threshold may be determined according to the current voltage value, the first resistor, the second resistor, and the third resistor.

[0117] Exemplarily, the first preset threshold and the second preset threshold may be equal.

[0118] Exemplarily, the first preset threshold and the second preset threshold can be calculated by the following formula:

[0119] (3)

[0120] Among them, U1' represents the first preset threshold, U2' represents the second preset threshold, U represents the current voltage value, R1 represents the first resistor, R2 represents the second resistor, and R3 represents the third resistor.

[0121] For example, the first preset threshold and the second preset threshold determined by combining the current voltage value, the first resistor, the second resistor and the third resistor can make the judgment result on whether there is a short circuit fault between the single cells in the battery more accurate.

[0122] In the embodiment of the present application, the first preset threshold and the second preset threshold determined in combination with the current voltage value, the first resistor, the second resistor and the third resistor can make the judgment result of whether there is a short circuit fault between the single cells in the battery more accurate.

[0123] Fig. 9 A schematic diagram of a flow chart of another heating film detection method provided by an embodiment of the present application is shown. Fig. 9 As shown, the heating film detection method provided in the embodiment of the present application may include the following steps:

[0124] S910. Acquire a first voltage value and a second voltage value in a battery circuit.

[0125] Exemplarily, step S910 is consistent with step S310, and will not be described in detail here.

[0126] S920: If the first voltage value is less than or equal to the first preset threshold value, and the second voltage value is less than or equal to the second preset threshold value, it is determined that the heating film has no fault.

[0127] Exemplarily, when it is determined that the first voltage value is less than or equal to the first preset threshold value, and the second voltage value is less than or equal to the second preset threshold value, it can be determined that there is no short circuit fault between the heating film and the single cell in the battery.

[0128] Exemplarily, by determining that the first voltage value is less than or equal to the first preset threshold and the second voltage value is less than or equal to the second preset threshold, it can be determined that there is no short circuit fault between the heating film and the single cell in the battery, thereby enabling detection of various states in the battery.

[0129] In the embodiments of the present application, the battery includes but is not limited to a lithium ion battery, a lithium metal battery, a lead-acid battery, a nickel-cathode battery, a nickel-hydrogen battery, a lithium-sulfur battery, a lithium-air battery or a sodium ion battery, which is not limited here. In terms of scale, the battery can be a single cell, a battery or a battery pack, which is not limited here.

[0130] It should be noted that the application scenarios described in the above-mentioned embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field can know that with the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0131] Based on the same inventive concept, the present application also provides a heating film detection device. Fig.10 Provide detailed explanation.

[0132] Fig.10 A schematic diagram of the structure of the heating film detection device provided in the embodiment of the present application is shown. Fig.10 As shown, the heating film detection device 1000 may include an acquisition module 1001 and a determination module 1002 .

[0133] The acquisition module 1001 is used to acquire a first voltage value and a second voltage value in a battery circuit, wherein the first voltage value is used to indicate a voltage parameter of a first circuit, and the second voltage value is used to indicate a voltage parameter of a second circuit, the battery comprises n monomer cells connected in series in sequence, the first circuit comprises the first to the i-th monomer cells and the circuit to which the heating film belongs, the second circuit comprises the j-th to the n-th monomer cells and the circuit to which the heating film belongs, 1≤i≤j≤n;

[0134] The determination module 1002 is used to determine whether the heating film has a fault according to the first voltage value and the second voltage value.

[0135] In one embodiment, the acquisition module 1001 acquires the first voltage value and the second voltage value in the battery circuit in the following manner: the main negative switch in the control main circuit is in a closed state, and the main positive switch in the control main circuit is in an open state to form a first circuit, and the first voltage value corresponding to the first circuit is acquired; the main negative switch in the control main circuit is in an open state, and the main positive switch in the control main circuit is in a closed state to form a second circuit, and the second voltage value corresponding to the second circuit is acquired.

[0136] In one embodiment, the branch to which the heating film belongs further includes a third switch;

[0137] The third switch is connected between the heating film and the main positive switch. The acquisition module 1001 controls the main negative switch in the main circuit to be in an open state, and controls the main positive switch in the main circuit to be in a closed state, so as to form a second circuit, and obtain a second voltage value corresponding to the second circuit: the main negative switch in the main circuit is controlled to be in an open state, and the main positive switch and the third switch in the main circuit are controlled to be in a closed state, so as to form a second circuit, and obtain a second voltage value corresponding to the second circuit;

[0138] Alternatively, the third switch is connected between the heating film and the main negative switch, and the acquisition module 1001 controls the main negative switch in the main circuit to be in a closed state, and controls the main positive switch in the main circuit to be in an open state in the following manner to form a first circuit, and obtains a first voltage value corresponding to the first circuit: controls the main negative switch and the third switch in the main circuit to be in a closed state, and controls the main positive switch in the main circuit to be in an open state to form a first circuit, and obtains a first voltage value corresponding to the first circuit.

[0139] In one embodiment, the determination module 1002 determines whether the heating film is faulty based on the first voltage value and the second voltage value in the following manner: if the first voltage value is greater than the first preset threshold, or the second voltage value is greater than the second preset threshold, it is determined that the heating film is faulty.

[0140] In one implementation, the first preset threshold is equal to the second preset threshold.

[0141] In one embodiment, the determination module 1002 is further used to: if the first voltage value is greater than a first preset threshold, determine that the heating film fault position is close to the nth battery cell; if the second voltage value is greater than a second preset threshold, determine that the heating film fault position is close to the 1st battery cell.

[0142] In one embodiment, the determination module 1002 is also used to: obtain the current voltage value of the battery; obtain the first resistance of the heating film; in the event of a fault in the heating film, obtain the second resistance between the heating film and the outer shell of the single cell and the third resistance between the outer shell of the single cell and the positive pole of the single cell; determine the first preset threshold value and the second preset threshold value based on the current voltage value, the first resistance, the second resistance and the third resistance.

[0143] In one implementation, the determination module 1002 determines the first preset threshold and the second preset threshold according to the current voltage value, the first resistor, the second resistor, and the third resistor in the following manner: the first preset threshold and the second preset threshold are determined according to the following formula:

[0144]

[0145] Among them, U1' represents the first preset threshold, U2' represents the second preset threshold, U represents the current voltage value, R1 represents the first resistor, R2 represents the second resistor, and R3 represents the third resistor.

[0146] In one implementation, the determination module 1002 is further configured to: determine that the heating film has no fault if the first voltage value is less than or equal to a first preset threshold value, and the second voltage value is less than or equal to a second preset threshold value.

[0147] The heating film detection device in the embodiment of the present application can be a device, or a component, integrated circuit, or chip in a terminal. The device can be a mobile electronic device or a non-mobile electronic device. Exemplarily, the mobile electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc. The non-mobile electronic device can be a server, a network attached storage (NAS), a personal computer (PC), etc., which is not specifically limited in the embodiment of the present application.

[0148] The collision handling device provided in the embodiment of the present application can achieve Figure 3To avoid repetition, the various processes in the illustrated embodiment of the heating film detection method will not be described again here.

[0149] Based on the same inventive concept, an embodiment of the present application also provides an electronic device. Fig.11 A schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present application is shown.

[0150] The electronic device 1100 may include a processor 1101 and a memory 1102 storing computer program instructions.

[0151] Specifically, the processor 1101 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present invention.

[0152] The memory 1102 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 1102 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 1102 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 1102 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 1102 is a non-volatile solid-state memory.

[0153] In a particular embodiment, the memory 1102 includes a read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these. Exemplarily, the memory may include a non-volatile transient memory.

[0154] The processor 1101 implements any one of the collision handling methods in the above embodiments by reading and executing computer program instructions stored in the memory 1102 .

[0155] In one example, the electronic device 1100 may further include a communication interface 1103 and a bus 1110. Fig.11 As shown, the processor 1101, the memory 1102, and the communication interface 1103 are connected via a bus 1110 and communicate with each other.

[0156] The communication interface 1103 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiment of the present invention.

[0157] Bus 1110 includes hardware, software or both, coupling the components of the electronic device to each other. For example, but not limitation, the bus may include an accelerated graphics port (AGP) or other graphics bus, an enhanced industrial standard architecture (EISA) bus, a front-side bus (FSB), a hypertransport (HT) interconnect, an industrial standard architecture (ISA) bus, an infinite bandwidth interconnect, a low pin count (LPC) bus, a memory bus, a microchannel architecture (MCA) bus, a peripheral component interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a serial advanced technology attachment (SATA) bus, a video electronics standard association local (VLB) bus or other suitable bus or a combination of two or more of these. Where appropriate, bus 1110 may include one or more buses. Although the embodiments of the present invention describe and illustrate a specific bus, the present invention contemplates any suitable bus or interconnect.

[0158] Exemplarily, the electronic device 1100 may be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA).

[0159] The electronic device can execute the heating film detection method in the embodiment of the present application, thereby realizing the combination Figure 1 and Fig.10 The invention describes a heating film detection method and a heating film detection device.

[0160] Based on the same inventive concept, the embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the collision handling method in the above embodiment can be implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here. Among them, the above-mentioned computer-readable storage medium may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc., which is not limited here.

[0161] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0162] The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link via a data signal carried in a carrier. "Computer-readable medium" may include any medium capable of storing or transmitting information. Examples of computer-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0163] According to an embodiment of the present application, the computer-readable storage medium may be a non-transitory computer-readable storage medium.

[0164] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0165] The above describes various aspects of the present application with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the functions / actions specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0166] According to the embodiments described above in the present application, these embodiments do not describe all the details in detail, nor do they limit the present application to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A heating film detection method, characterized in that: include: Obtain a first voltage value and a second voltage value in a battery circuit, wherein the first voltage value is used to indicate a voltage parameter of a first circuit, and the second voltage value is used to indicate a voltage parameter of a second circuit, the battery comprises n single cells connected in series in sequence, the first circuit comprises the first to the i-th single cells and a circuit to which a heating film belongs, the second circuit comprises the j-th to the n-th single cells and a circuit to which the heating film belongs, and 1≤i≤j≤n; determining whether the heating film has a fault according to the first voltage value and the second voltage value; The determining, according to the first voltage value and the second voltage value, whether the heating film has a fault includes: If the first voltage value is greater than a first preset threshold, or the second voltage value is greater than a second preset threshold, it is determined that the heating film has a fault; If the first voltage value is greater than the first preset threshold, it is determined that the fault position of the heating film is close to the nth single battery cell; If the second voltage value is greater than the second preset threshold, it is determined that the fault position of the heating film is close to the first single battery cell.

2. The method according to claim 1, characterized in that The obtaining of a first voltage value and a second voltage value in a battery circuit includes: Controlling a main negative switch in a main loop to be in a closed state, and controlling a main positive switch in the main loop to be in an open state, so as to form a first loop, and obtaining a first voltage value corresponding to the first loop; A main negative switch in the main circuit is controlled to be in an open state, and a main positive switch in the main circuit is controlled to be in a closed state to form a second circuit, and a second voltage value corresponding to the second circuit is obtained.

3. The method according to claim 2, characterized in that The branch to which the heating film belongs also includes a third switch; The third switch is connected between the heating film and the main positive switch, and the main negative switch in the main circuit is controlled to be in an open state, and the main positive switch in the main circuit is controlled to be in a closed state to form a second circuit, and a second voltage value corresponding to the second circuit is obtained, including: Controlling the main negative switch in the main loop to be in an open state, and controlling the main positive switch and the third switch in the main loop to be in a closed state to form a second loop, and obtaining a second voltage value corresponding to the second loop; Alternatively, the third switch is connected between the heating film and the main negative switch, the main negative switch in the main circuit is controlled to be in a closed state, and the main positive switch in the main circuit is controlled to be in an open state to form a first circuit, and a first voltage value corresponding to the first circuit is obtained, including: A main negative switch and the third switch in the main loop are controlled to be in a closed state, and a main positive switch in the main loop is controlled to be in an open state to form a first loop, and a first voltage value corresponding to the first loop is obtained.

4. The method according to any one of claims 1 to 3, characterized in that The first preset threshold is equal to the second preset threshold.

5. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: Obtaining the current voltage value of the battery; obtaining a first resistance of the heating film; In the case where the heating film fails, obtaining a second resistance between the heating film and the outer shell of the single cell and a third resistance between the outer shell of the single cell and the positive electrode of the single cell; The first preset threshold and the second preset threshold are determined according to the current voltage value, the first resistor, the second resistor, and the third resistor.

6. The method according to claim 5, characterized in that The determining the first preset threshold and the second preset threshold according to the current voltage value, the first resistor, the second resistor, and the third resistor includes: The first preset threshold and the second preset threshold are determined according to the following formula: ， Among them, U1' represents the first preset threshold, U2' represents the second preset threshold, U represents the current voltage value, R1 represents the first resistor, R2 represents the second resistor, and R3 represents the third resistor.

7. The method according to any one of claims 1 to 3, characterized in that The method further comprises: If the first voltage value is less than or equal to the first preset threshold, and the second voltage value is less than or equal to the second preset threshold, it is determined that the heating film has no fault.

8. A heating film detection device, characterized in that: include: An acquisition module, used for acquiring a first voltage value and a second voltage value in a battery circuit, wherein the first voltage value is used to indicate a voltage parameter of a first circuit, and the second voltage value is used to indicate a voltage parameter of a second circuit, the battery comprises n single cells connected in series in sequence, the first circuit comprises the first to the i-th single cells and the circuit to which the heating film belongs, the second circuit comprises the j-th to the n-th single cells and the circuit to which the heating film belongs, 1≤i≤j≤n; A determination module is used to determine whether the heating film has a fault based on the first voltage value and the second voltage value; and if the first voltage value is greater than a first preset threshold, or the second voltage value is greater than a second preset threshold, it is determined that the heating film has a fault; if the first voltage value is greater than the first preset threshold, it is determined that the fault position of the heating film is close to the nth said single cell; if the second voltage value is greater than the second preset threshold, it is determined that the fault position of the heating film is close to the first said single cell.

9. A heating film detection device, characterized in that: include: A processor and a memory storing computer program instructions, wherein when the processor executes the computer program instructions, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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