Temperature measurement method, battery management system, battery, apparatus, and storage medium

Abstract

The present application discloses a temperature measurement method, a battery management system, a battery, an apparatus, and a storage medium. The temperature measurement method is applied to a battery management system, the battery management system comprises a temperature sensor and a temperature sampling chip, and the temperature sensor is connected to the temperature sampling chip. The temperature measurement method comprises: acquiring the initial temperature of a battery cell collected by the temperature sensor; acquiring the working state of the temperature sampling chip; and obtaining the actual temperature of the battery cell on the basis of the initial temperature and the working state of the temperature sampling chip. The solution can improve the accuracy of temperature measurement.

Description

Temperature detection methods, battery management systems, batteries, devices, and storage media

[0001] Cross-referencing

[0002] [Amended according to Rule 91 29.05.2025] This application claims priority to Chinese Patent Application No. 202411440920.5, filed on October 15, 2024, entitled “Temperature Detection Method, Battery Management System, Battery, Device and Storage Medium”, the entire contents of which are incorporated herein by reference. [Technical Field]

[0003] This application relates to the field of batteries, and in particular to a temperature detection method, a battery management system, a battery, a device, and a storage medium. [Background Technology]

[0004] Whether the battery temperature is within the normal range is important for the normal use of the battery. If the battery temperature remains at a high temperature for a long time, it may cause abnormalities in the battery's operation.

[0005] Currently, methods for detecting battery temperature include using a temperature sensor to detect the battery temperature, and a temperature sampling circuit converting the analog signal output by the temperature sensor into a data signal to obtain the battery temperature. However, the battery temperature detected by this method is not very accurate. [Summary of the Invention]

[0006] This application provides at least one temperature detection method, a battery management system, a battery, a device, and a storage medium.

[0007] This application provides a temperature detection method, comprising: the temperature detection method is applied to a battery management system, the battery management system including a temperature sensor and a temperature sampling chip, the temperature sensor being connected to the temperature sampling chip, and the temperature detection method including: acquiring the initial temperature collected by the temperature sensor from a battery cell; acquiring the operating state of the temperature sampling chip; and obtaining the actual temperature of the battery cell based on the initial temperature and the operating state of the temperature sampling chip.

[0008] In the above scheme, the battery management system includes a temperature sensor and a temperature sampling chip. The heat generated by the temperature sampling chip during operation may affect the temperature collected by the temperature sensor. Furthermore, the heat generated or accumulated by the temperature sampling chip under different operating conditions may vary, which will lead to differences in the impact on the temperature collected by the temperature sensor. By considering the operating state of the temperature sampling chip and adjusting the initial temperature, a more accurate temperature of the battery cell can be obtained.

[0009] In some embodiments, the actual temperature of a battery cell is obtained based on the initial temperature and the operating state of the temperature sampling chip, including: determining a reference temperature compensation amount corresponding to the operating state of the temperature sampling chip based on the operating state of the temperature sampling chip and a preset correspondence between the reference temperature compensation amount and the operating state; and determining the actual temperature of the battery cell based on the initial temperature and the reference temperature compensation amount.

[0010] In the above scheme, the heat emitted by the temperature sampling chip may vary under different operating conditions. By setting corresponding reference temperature compensation for different operating conditions of the temperature sampling chip, the actual temperature of the battery cell can be determined more accurately.

[0011] In some embodiments, the temperature sampling chip includes an equalization circuit, and the operating state of the temperature sampling chip includes the equalization circuit being in an activated state or a deactivated state. Based on the operating state of the temperature sampling chip and the correspondence between the preset reference temperature compensation amount and the operating state, the reference temperature compensation amount corresponding to the operating state of the temperature sampling chip is determined, including: in response to the operating state of the temperature sampling chip being the equalization circuit being in an activated state, the reference temperature compensation amount corresponding to the equalization circuit being in an activated state in the correspondence is determined as the reference temperature compensation amount corresponding to the operating state of the temperature sampling chip.

[0012] In the above scheme, the equalization circuit will dissipate heat when it is in the start-up state. By taking into account the temperature effect of the equalization circuit on the temperature collected by the temperature sensor when it is in the start-up state, the actual temperature of the battery cell can be determined more accurately.

[0013] In some embodiments, the reference temperature compensation amount corresponding to the equalization circuit being in the activated state in the correspondence is obtained in advance. The reference temperature compensation amount corresponding to the equalization circuit being in the activated state in the correspondence includes: obtaining a first temperature collected by the temperature sensor on the target object when the equalization circuit is in the activated state, the target object being the object being measured by the temperature sensor; and obtaining a second temperature collected by the temperature sensor on the target object when the equalization circuit is in the deactivated state, the target object having the same temperature when the equalization circuit is in the activated state and when it is not in the activated state; and using the difference between the first temperature and the second temperature as the reference temperature compensation amount corresponding to the equalization circuit being in the activated state in the correspondence.

[0014] In the above scheme, by obtaining the temperature difference between the temperature collected by the temperature sensor on the target object at the same temperature when the equalization circuit is in the start-up state and not in the start-up state, the influence of the heat dissipation of the equalization circuit on the temperature collected by the temperature sensor can be determined, thereby determining the temperature compensation amount when the equalization circuit is in the start-up state.

[0015] In some embodiments, the temperature sampling chip further includes a functional circuit that determines the actual temperature of a battery cell based on an initial temperature and a reference temperature compensation amount, including: combining the reference temperature compensation amount and a preset temperature compensation amount related to the functional circuit to obtain a target temperature compensation amount; and using the target temperature compensation amount to perform temperature compensation on the initial temperature to obtain the actual temperature of the battery cell.

[0016] In the above scheme, in addition to the equalization circuit, the components in the functional circuit of the temperature sampling chip may also generate heat during operation and affect the temperature sensor. Combining the effects of the equalization circuit and the functional circuit on the temperature sensor, the target temperature compensation amount is determined to be more accurate.

[0017] In some embodiments, the preset temperature compensation amount is obtained in advance. The method of obtaining the preset temperature compensation amount in advance includes: obtaining at least one third temperature collected by the temperature sensor from a reference object with a known temperature when the equalization circuit is in a non-start state, wherein the reference object is the temperature measurement object of the temperature sensor; and determining the preset temperature compensation amount based on the difference between the at least one third temperature and the known temperature of the reference object.

[0018] In the above scheme, when the control equalization circuit is in the non-start state, if it is not affected by the heat dissipation of the temperature sampling chip, the temperature collected by the temperature sensor from the reference object with a known temperature should have a small difference or even be equal to the known temperature. If the temperature collected by the temperature sensor differs greatly from the known temperature, it indicates that it is affected by the functional circuit in the battery sampling chip, and the temperature difference can be used as the preset temperature compensation amount.

[0019] In some embodiments, the temperature detection method further includes: determining the operating time of the temperature sampling chip; and determining a candidate temperature compensation amount corresponding to the operating time of the temperature sampling chip from the correlation between the operating time and the candidate temperature compensation amount, as a preset temperature compensation amount.

[0020] In the above scheme, when the heat generation and heat dissipation of the temperature sampling chip are not in balance, the longer the temperature sampling chip operates, the greater the cumulative heat dissipation may be. By obtaining the temperature compensation amount of the temperature sampling chip under different operating times, the corresponding preset temperature compensation amount can be determined according to the duration of the temperature sampling chip. Compared with using the same temperature compensation amount for the temperature sampling chip under different operating times, the preset temperature compensation amount determined by this scheme is more accurate.

[0021] In some embodiments, the reference object is the environment in which the battery management system is located, and each third temperature is the temperature of the collected environment.

[0022] In the above scheme, the battery management system can calibrate the compensation amount by simply detecting the ambient temperature without relying on individual battery cells, making the calibration process more convenient.

[0023] In some embodiments, there are multiple temperature sensors, each with a corresponding reference temperature compensation value. The actual temperature of a battery cell is determined based on the initial temperature and the reference temperature compensation value, including: for the initial temperature collected by each temperature sensor, temperature compensation is performed on the initial temperature based on the reference temperature compensation value corresponding to the temperature sensor to obtain the compensated temperature; and the actual temperature is obtained based on each compensated temperature.

[0024] In the above scheme, by setting up multiple temperature sensors, the compensated temperature determined by the multiple temperature sensors can achieve a mutual verification effect, thereby making the determined actual temperature more accurate.

[0025] In some embodiments, obtaining the actual temperature based on each compensated temperature includes: in response to the difference between each compensated temperature being less than or equal to a preset difference, using the statistical value of each compensated temperature as the actual temperature; or, in response to the difference between each compensated temperature being greater than a preset difference, determining a temperature detection anomaly and issuing a prompt message.

[0026] In the above scheme, if the difference between each compensated temperature is small, it means that each compensated temperature is reliable. If the difference between each compensated temperature is large, it means that at least some of the compensated temperatures are unreliable. This may be due to reasons such as damage to the temperature sensor. In this case, a prompt message can be sent to allow for the repair of each temperature sensor.

[0027] This application provides a battery management system that performs any of the above-described temperature detection methods. The battery management system includes a temperature sensor and a temperature sampling chip.

[0028] In some embodiments, the battery management system includes a mounting component, a temperature sampling chip disposed on one side of the mounting component, and a temperature sensor disposed on the other side of the mounting component. The mounting component is used to cooperate with a battery cell to establish a connection between the battery management system and the battery cell.

[0029] In the above scheme, by setting up mounting components, the battery management system can be installed on the battery cells.

[0030] In some embodiments, a groove is provided on the mounting component, and a temperature sensor is placed in the groove. The groove is filled with a thermally conductive medium, which is disposed on the side of the temperature sensor facing the opening of the groove, so that the thermally conductive medium is between the temperature sensor and the battery cell when the battery management system cooperates with the battery cell.

[0031] In the above solution, the thickness of the battery management system can be reduced by creating a groove on the mounting component and placing the temperature sensor in the groove. In addition, filling the groove with a thermally conductive medium can achieve a stable connection between the temperature sensor and the battery cell.

[0032] In some embodiments, the battery management system includes a fixing member, and a temperature sampling chip is disposed between the fixing member and a mounting member. The fixing member is used to cooperate with the mounting member to fix the temperature sampling chip on the mounting member.

[0033] In the above scheme, the temperature sampling chip can be easily installed on the mounting component or removed from the mounting component by setting a fixing component.

[0034] This application provides a battery, which includes a battery cell and any of the above-mentioned battery management systems, wherein the battery management system is connected to the battery cell.

[0035] In some embodiments, the battery management system includes a mounting component, a temperature sampling chip in the battery management system is disposed on the side of the mounting component away from the battery cell, and temperature sensors in the battery management system are disposed on the side of the mounting component close to the battery cell. The mounting component cooperates with the top cover of the battery cell so that each temperature sensor measures the temperature of the top cover of the battery cell.

[0036] In the above solution, the mounting component cooperates with the top cover of the battery cell, enabling the temperature sensor to measure the temperature of the top cover of the battery cell.

[0037] In some embodiments, the distance between the temperature sensor and the negative electrode of the battery cell is less than the distance between the temperature sensor and the positive electrode of the battery cell.

[0038] In the above scheme, since the temperature of the negative electrode of the battery cell is closer to the internal temperature of the battery cell than the temperature of the positive electrode, placing the temperature sensor at the negative electrode of the battery cell can make the initial temperature collected by the temperature sensor more accurate.

[0039] This application provides an electrical device, which includes the aforementioned battery.

[0040] This application provides a computer-readable storage medium storing program instructions thereon, which, when executed by a processor, implement any one of the temperature detection methods.

[0041] In the above scheme, the battery management system includes a temperature sensor and a temperature sampling chip. The heat generated by the temperature sampling chip during operation may affect the temperature collected by the temperature sensor. Furthermore, the heat generated or accumulated by the temperature sampling chip under different operating conditions may vary, which will lead to differences in the impact on the temperature collected by the temperature sensor. By considering the operating state of the temperature sampling chip and adjusting the initial temperature, a more accurate temperature of the battery cell can be obtained.

[0042] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. [Attached Image Description]

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the technical solutions of this application.

[0044] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments;

[0045] Figure 2 is a schematic diagram of the battery structure provided in some embodiments;

[0046] Figure 3 is another structural schematic diagram of the battery provided in some embodiments;

[0047] Figure 4 is a partial schematic diagram of a battery management system provided in some embodiments;

[0048] Figure 5 is another structural schematic diagram of the battery management system provided in some embodiments;

[0049] Figure 6 is a flowchart illustrating a temperature detection method provided in some embodiments;

[0050] Figure 7 is a schematic diagram of a sub-process of step S13 in Figure 6 provided in some embodiments;

[0051] Figure 8 is a schematic diagram of the structure of a computer-readable storage medium provided in some embodiments.

[0052] Reference numerals: 1000-Vehicle, 100-Battery, 200-Vehicle Controller, 300-Motor, 10-Battery Management System, 20-Battery Cell, 11-Temperature Sampling Chip, 12-Temperature Sensor, 13-Mounting Component, 14-Fixing Component, 15-Heat Conducting Medium, 16-Groove, 17-Electrode Hole, 21-Top Cover, 22-Housing, 40-Computer-Readable Storage Medium, 401-Program Instructions.

Detailed Implementation Methods

[0053] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0054] In the following description, specific details such as particular subsystem structures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0055] In this document, 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 " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "many" in this document means two or more. Moreover, the term "at least one" in this document means any combination of at least two of any one or more of a plurality of objects. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0056] Currently, temperature detection of individual battery cells requires a temperature sensor to collect an analog temperature signal, which is then converted from analog to digital by a temperature sampling circuit to obtain the cell's temperature. The battery sampling circuit can be integrated into a battery sampling chip, which can also integrate other circuits. This is because components within the temperature sampling circuit may generate heat during operation, or the integration of the temperature sampling circuit with other circuits into a single chip may introduce heat dissipation from these other circuits. Therefore, directly using the temperature collected by the temperature sensor and performing analog-to-digital conversion as the cell's temperature would result in inaccurate readings.

[0057] Therefore, this solution proposes a temperature detection method. After receiving the initial temperature collected by the temperature sensor, the method determines the corresponding target temperature compensation amount considering the temperature influence of the temperature sampling chip on the temperature sensor. Then, the initial temperature is compensated according to the target temperature compensation amount, thereby reducing the heat dissipation effect of the temperature sampling chip and making the determined temperature more accurate.

[0058] The electrical devices disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. These electrical devices can be 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., while spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0059] 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.

[0060] Referring to Figure 1, vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. Battery 100 can be used to power vehicle 1000; for example, battery 100 can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a vehicle controller 200 and a motor 300. The vehicle controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0061] 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.

[0062] Please refer to Figures 2 and 3 at the same time. This application provides a battery 100, which includes a battery cell 20 and any of the following battery management systems 10. The battery management system 10 is connected to the battery cell 20.

[0063] Battery 100 can be a smart battery, meaning it is equipped with a Battery Management System (BMS). The BMS can be considered a component of the battery management system. The structure of the BMS 10 can be referenced in the following embodiment of the battery management system, and will not be repeated here. The BMS 10 can be connected to the outer wall of the battery cell 20, for example, it can be connected to the top cover 21 of the battery cell 20 or to the side wall of the battery cell 20. The 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. The battery cell 20 refers to the smallest unit constituting battery 100. The outer casing of the battery cell 20 includes a housing 22 and a top cover 21. The top cover 21 and the housing 22 cover each other, and together they define a space for accommodating the battery cell 20. The housing 22 can be a hollow structure with one open end, and the top cover 21 can be a plate-like structure. The top cover 21 closes to the open side of the housing 22, so that the top cover 21 and the housing 22 together define the receiving space. Alternatively, both the top cover 21 and the housing 22 can be hollow structures with one open side, with the open side of the top cover 21 closing to the open side of the housing 22. Of course, the box formed by the top cover 21 and the housing 22 can be of various shapes, such as a cylinder, a cuboid, etc. The battery cell 20 also includes an electrode assembly (not shown). The electrode assembly includes a stacked positive electrode sheet, a separator, and a negative electrode sheet, which can form a stacked structure. The electrode sheet is generally composed of a current collector, active material, binder, conductive agent, etc., and is a high-potential electrode sheet that undergoes a reduction reaction during discharge. The positive electrode sheet is the positive electrode of the battery cell 20, and the negative electrode sheet is the negative electrode of the battery cell 20. A stacked structure can be achieved by placing a diaphragm between the positive and negative electrode plates.

[0064] In the above scheme, the battery management system 10 included in the battery 100 can perform temperature compensation on the initial temperature detected by the temperature sensor 12, and can obtain a more accurate temperature of the battery cell 20.

[0065] In some embodiments, the battery management system 10 includes a mounting component 13, a temperature sampling chip 11 in the battery management system 10 is disposed on the side of the mounting component 13 away from the battery cell 20, and each temperature sensor 12 in the battery management system 10 is disposed on the side of the mounting component 13 close to the battery cell 20. The mounting component 13 cooperates with the top cover 21 of the battery cell 20 so that each temperature sensor 12 measures the temperature of the top cover 21 of the battery cell 20.

[0066] Temperature sensor 12 includes, but is not limited to, a thermistor (NTC), a resistance temperature detector, and a thermocouple. This embodiment uses an NTC as an example. Temperature sampling chip 11 can be an AFE (Analogue Front End), responsible for receiving and converting analog signals, and may integrate temperature sampling circuitry. In other embodiments, temperature sampling chip 11 may also integrate other circuitry for monitoring or managing the battery cell 20, including but not limited to: communication circuitry, equalization circuitry, current sampling circuitry, and / or voltage sampling circuitry. Exemplarily, the temperature sampling circuitry may include an analog-to-digital converter (ADC), a filter circuit, an amplifier circuit, a processor, and serial / parallel / Ethernet output. Mounting component 13 can be a mounting plate. Optionally, the mounting component 13 may cooperate with the battery cell 20 in ways including but not limited to snap-fit, screw / bolt fixing, or adhesive bonding. After mounting component 13 is engaged with the top cover 21 of battery cell 20, temperature sensor 12 is connected to the top cover 21 of battery cell 20, enabling temperature sensor 12 to detect the temperature of the top cover 21 of battery cell 20.

[0067] In the above scheme, the mounting component 13 cooperates with the top cover 21 of the battery cell 20, so that the temperature sensor 12 can measure the temperature of the top cover 21 of the battery cell 20.

[0068] In some embodiments, the distance between the temperature sensor 12 and the negative electrode of the battery cell 20 is less than the distance between the temperature sensor 12 and the positive electrode of the battery cell 20.

[0069] In the above scheme, since the temperature of the negative electrode of the battery cell 20 is closer to the internal temperature of the battery cell 20 than the temperature of the positive electrode of the battery cell 20, by placing the temperature sensor 12 at the negative electrode of the battery cell 20, the initial temperature collected by the temperature sensor 12 can be more accurate.

[0070] In some embodiments, the distance between the temperature sampling chip 11 and the positive electrode of the battery cell 20 is less than the distance between the temperature sampling chip 11 and the negative electrode of the battery cell 20.

[0071] By placing the temperature sampling chip 11 at the positive terminal of the battery cell 20 and the temperature sensor 12 at the negative terminal of the battery cell 20, the temperature influence of the temperature sampling chip 11 on the temperature sensor 12 can be reduced compared to placing the temperature sampling chip 11 at a position closer to the negative terminal of the battery cell 20.

[0072] As shown in Figure 3, the battery management system 10 provided in this application can execute the temperature detection method provided in any of the following temperature detection method embodiments. The battery management system 10 may include a temperature sensor 12 and a temperature sampling chip 11.

[0073] In some embodiments, the temperature sensor 12 is used to acquire the initial temperature of the battery cell 20; the temperature sampling chip 11 is used to execute the temperature detection method provided in any of the following temperature detection method embodiments. In some embodiments, the temperature sampling chip 11 may also send the initial temperature acquired by the temperature sensor 12 to other modules (not shown) in the battery management system 10 that have data processing functions to determine the actual temperature of the battery cell based on the initial temperature and the operating state of the temperature sampling chip 11.

[0074] The number of temperature sensors 12 can be at least one, and the temperature sensors 12 include, but are not limited to, thermistors (NTCs), resistance temperature detectors, and thermocouples. This embodiment uses an NTC as an example for the temperature sensor 12. The temperature sampling chip 11 can be an AFE, which can integrate a temperature sampling circuit. In other embodiments, the temperature sampling chip 11 can also integrate other circuits for monitoring or managing the battery cell 20, including, but not limited to, communication circuits, equalization circuits, current sampling circuits, and / or voltage sampling circuits. Exemplarily, the temperature sampling circuit can include an analog-to-digital converter (ADC), a filter circuit, an amplifier circuit, a processor, and serial / parallel / Ethernet outputs. The battery management system 10 provided by this solution can perform temperature detection on any object requiring temperature detection, such as the battery cell 20, battery module 100, and other devices. Specifically, the temperature sampling chip 11 can perform temperature compensation for the initial temperature by: determining a target temperature compensation amount based on the temperature influence of the temperature sampling chip 11 on the temperature sensor 12; then, using the target temperature compensation amount to compensate the initial temperature to obtain the actual temperature of the battery cell 20. For specific temperature compensation methods, please refer to the following temperature detection method implementation examples, which will not be elaborated here.

[0075] In the above scheme, the battery management system 10 includes a temperature sensor 12 and a temperature sampling chip 11. The heat generated by the temperature sampling chip 11 during operation may affect the temperature collected by the temperature sensor 12. For example, the closer the temperature sensor 12 is to the temperature sampling chip 11, the greater the influence of the temperature of the temperature sampling chip 11. By determining the target temperature compensation amount based on the temperature influence of the temperature sampling chip 11 on the temperature sensor 12, and then compensating the initial temperature based on the target temperature compensation amount, the influence of heat dissipation of the temperature sampling chip 11 can be reduced, thereby obtaining a more accurate temperature of the battery cell 20 to be tested.

[0076] In some embodiments, the battery management system 10 includes a mounting component 13, a temperature sampling chip 11 disposed on one side of the mounting component 13, and a temperature sensor 12 disposed on the other side of the mounting component 13. The mounting component 13 is used to cooperate with the battery cell 20 to establish a connection between the battery management system 10 and the battery cell 20.

[0077] Mounting component 13 can be a mounting plate. After mounting component 13 mates with battery cell 20, temperature sampling chip 11 can be positioned on the side of mounting component 13 furthest from battery cell 20, and temperature sensor 12 can be positioned on the side closer to battery cell 20. In some applications, after battery management system 10 mates with battery cell 20, temperature sensor 12 can be positioned near the negative terminal of battery cell 20, i.e., the distance between temperature sensor 12 and the negative terminal of battery cell 20 is less than the distance between temperature sensor 12 and the positive terminal of battery cell 20. Similarly, temperature sampling chip 11 can be positioned near the positive terminal of battery cell 20, i.e., the distance between temperature sampling chip 11 and the positive terminal of battery cell 20 is less than the distance between temperature sampling chip 11 and the negative terminal of battery cell 20. Optionally, the method of mate between mounting component 13 and battery cell 20 includes, but is not limited to, snap-fit, screw / bolt fixing, and adhesive bonding. The methods of mate between temperature sampling chip 11 and temperature sensor 12 and mounting component 13 include, but are not limited to, the following first and second methods. First method: Positioning elements (not shown) are provided on the temperature sampling chip 11 and the temperature sensor 12. The positioning elements on the temperature sampling chip 11 and the temperature sensor 12 cooperate with another positioning element (not shown) on the mounting part 13 to enable the temperature sampling chip 11 and the temperature sensor 12 to be mounted on the mounting part 13. Second method: The temperature sampling chip 11 is fixed to one side of the mounting part 13 by means of cooperation between the fixing element 14 and the mounting part 13, that is, the temperature sampling chip 11 is located between the fixing element 14 and the mounting part 13.

[0078] In the above scheme, by setting the mounting component 13, the battery management system 10 can be installed on the battery cell 20.

[0079] Please also refer to Figure 4. In some embodiments, the mounting component 13 has a groove 16, and the temperature sensor 12 is placed in each groove 16. The groove 16 is filled with a thermally conductive medium 15. The thermally conductive medium 15 is disposed on the side of the temperature sensor 12 facing the opening of the groove 16, so that when the battery management system 10 cooperates with the battery cell 20, the thermally conductive medium 15 is between the temperature sensor 12 and the battery cell 20.

[0080] As described above, the number of temperature sensors 12 can be at least one, and the number of grooves 16 can also be at least one, with one or more temperature sensors 12 placed in each groove 16. By creating grooves 16 on the mounting member 13 and placing the temperature sensors 12 within them, the temperature sensors 12 can be positioned to prevent them from sliding on one side of the mounting member 13. Furthermore, the thickness of the mounting member 13 plus the temperature sensors 12 can be reduced, resulting in a thinner and lighter battery management system 10. By filling the grooves 16 with a thermally conductive medium 15, the temperature of the battery cell 20 can be transferred to the temperature sensors 12 through the thermally conductive medium 15. The thermally conductive medium 15 includes, but is not limited to, thermally conductive adhesive, metal, etc.

[0081] In the above solution, by opening grooves 16 on the mounting part 13 and placing temperature sensors 12 in each groove 16, the thickness of the battery management system 10 can be reduced. In addition, filling the grooves 16 with thermally conductive medium 15 can achieve a stable connection between the temperature sensors 12 and the battery cells 20.

[0082] In some embodiments, the battery management system 10 includes a fixing member 14, and a temperature sampling chip 11 is disposed between the fixing member 14 and the mounting member 13. The fixing member 14 is used to cooperate with the mounting member 13 to fix the temperature sampling chip 11 on the mounting member 13.

[0083] The fixing member 14 can be a fixing plate. The fixing member 14 and the mounting member 13 can each be provided with mating positioning elements, so that after the fixing member 14 and the mounting member 13 are mated, the temperature sampling chip 11 is clamped between the fixing member 14 and the mounting member 13. In other embodiments, the fixing member 14 and the mounting member 13 are provided with threaded holes, so that the fixing member 14 and the mounting member 13 can be mated using threads or bolts.

[0084] In the above scheme, the fixing component 14 facilitates the installation of the temperature sampling chip 11 on the mounting component 13 or the removal of the temperature sampling chip 11 from the mounting component 13.

[0085] Referring also to Figure 5, the battery management system may also have electrode holes 17 for the positive and negative terminals of the battery cell 20 to extend out. In some embodiments, the battery management system may also have heat dissipation holes (not shown in the figure). The heat dissipation holes may be located between the two electrode holes 17 and close to the temperature sampling chip 11, and the heat dissipation holes may be used to improve the heat dissipation effect of the temperature sampling chip 11.

[0086] Please refer to Figure 6. The temperature detection method provided in this application is applicable to any of the battery management systems provided in the above-described battery management system embodiments. The battery management system includes a temperature sensor and a temperature sampling chip, with the temperature sensor and the temperature sampling chip connected. The temperature detection method may include the following steps S11 to S13: Step S11: Obtain the initial temperature of the battery cell collected by the temperature sensor. Step S12: Obtain the operating state of the temperature sampling chip. Step S13: Based on the initial temperature and the operating state of the temperature sampling chip, obtain the actual temperature of the battery cell.

[0087] In this battery management system, a temperature sensor and a temperature sampling chip are connected, enabling the temperature sampling chip to receive the initial temperature collected by the temperature sensor. The temperature sensor includes, but is not limited to, a thermistor (NTC), a resistance temperature detector, and a thermocouple. This embodiment uses an NTC temperature sensor as an example. The temperature sampling chip may integrate a temperature sampling circuit. In other embodiments, the temperature sampling chip may also integrate other circuits for monitoring or managing individual battery cells. These other circuits include, but are not limited to, communication circuits, equalization circuits, current sampling circuits, and / or voltage sampling circuits. For example, the temperature sampling circuit may include an analog-to-digital converter (ADC), a filter circuit, an amplifier circuit, a processor, and serial / parallel / Ethernet outputs.

[0088] In step S12, the operating state of the temperature sampling chip can be either the operating state when the temperature sensor collects the initial temperature, or the operating state of the temperature sampling chip for a period of time before the temperature sensor collects the initial temperature. For example, if the temperature sensor is in operating state A for a period of time before collecting the initial temperature, but switches to operating state B when the temperature sensor collects the initial temperature, then the heat dissipated by the temperature sampling chip is actually more the heat dissipated in operating state A. Therefore, adjusting the initial temperature using the temperature adjustment method or temperature compensation amount corresponding to operating state A is more accurate. Optionally, the temperature sampling chip can have multiple operating states, and different devices are in the active state in different operating states. For example, in one operating state of the temperature sampling chip, a certain circuit is in the active state, and in another operating state, the circuit is in the inactive state. In other application scenarios, the power of the same device is different in different operating states of the temperature sampling chip. For example, considering energy saving or efficiency, the same device may have multiple power levels, and the heat dissipated by the device or the cumulative heat dissipated during operation may differ under different power levels. Different operating states have varying degrees of impact on the temperature of the temperature sensor. If the operating state of the temperature sampling chip is determined, the degree of its impact on the temperature sensor can also be determined. Furthermore, the degree of impact of the temperature sampling chip on the temperature sensor under different operating states can be quantified. That is, after determining the operating state of the temperature sampling chip, the degree of its influence on the initial temperature collected by the temperature sensor can be determined, allowing for corresponding adjustments to the initial temperature to obtain the actual temperature of the battery cell. In some application scenarios, step S13 can be implemented by: pre-establishing temperature adjustment methods corresponding to different operating states; adjusting the initial temperature according to the temperature adjustment methods corresponding to the operating states of the temperature sampling chip to obtain the actual temperature. The temperature adjustment method can be a mapping relationship between the initial temperature and the actual temperature or a compensation amount for the initial temperature.

[0089] In the above scheme, the battery management system includes a temperature sensor and a temperature sampling chip. The heat generated by the temperature sampling chip during operation may affect the temperature collected by the temperature sensor. Furthermore, the heat generated or accumulated by the temperature sampling chip under different operating conditions may vary, which will lead to differences in the impact on the temperature collected by the temperature sensor. By considering the operating state of the temperature sampling chip and adjusting the initial temperature, a more accurate temperature of the battery cell can be obtained.

[0090] In some embodiments, step S12 may include the following steps: determining whether the operating state of the temperature sampling chip switches within a target time period, wherein the end time of the target time period is the time when the temperature sensor collects the initial temperature, and the interval between the start and end times of the target time period is fixed. If the operating state of the temperature sampling chip switches within the target time period, the operating state of the temperature sampling chip is determined to be the operating state before the switch within the target time period. If the operating state of the temperature sampling chip does not switch within the target time period, the operating state of the temperature sampling chip is determined to be the operating state during the process of the temperature sensor collecting the initial temperature. The length of the target time period can be determined with reference to the heat dissipation capacity of the battery management system. If the heat dissipation capacity of the battery management system is good, the length of the target time period can be shorter; if the heat dissipation capacity of the battery management system is poor, the length of the target time period can be longer.

[0091] In some embodiments, the temperature sampling chip has several operating states, and different operating states have different effects on the temperature of the temperature sensor. Referring to Figure 7, step S13 may include the following steps: Step S131: Based on the operating states of the temperature sampling chip and the correspondence between a preset reference temperature compensation amount and the operating states, determine the reference temperature compensation amount corresponding to the operating state of the temperature sampling chip. Step S132: Based on the initial temperature and the reference temperature compensation amount, determine the actual temperature of the battery cell.

[0092] In other words, each operating state of the temperature sampling chip can be set with a corresponding reference temperature compensation amount. After the operating state of the temperature sampling chip is determined, the corresponding reference temperature compensation amount can be determined based on this correspondence. The above step S123 can be implemented by directly using the determined reference temperature compensation amount as the target temperature compensation amount, or by combining the corresponding reference temperature compensation amount with other temperature compensation amounts to determine the target temperature compensation amount.

[0093] In the above scheme, the heat emitted by the temperature sampling chip may vary under different operating conditions. By setting corresponding temperature compensation values ​​for different operating conditions of the temperature sampling chip, the target temperature compensation value can be determined more accurately.

[0094] In some embodiments, the temperature sampling chip includes an equalization circuit, and the operating state of the temperature sampling chip includes the equalization circuit being in an active state or an inactive state. Step S121 above may include the following steps: in response to the operating state of the temperature sampling chip being the equalization circuit being in an active state, determining the reference temperature compensation amount corresponding to the equalization circuit being in an active state in the correspondence as the reference temperature compensation amount corresponding to the operating state of the temperature sampling chip.

[0095] The equalization circuit can integrate equalization control switches and related logic circuits, providing diagnostic and control interfaces. The equalization circuit provided by the temperature sampling chip (AFE) can be either internal or external equalization. The equalization resistor in the equalization circuit primarily generates heat. The equalization circuit can be determined to be in the active state by checking if the equalization function of the temperature sampling chip is enabled. If the equalization function is enabled, the equalization circuit is active; otherwise, it is in the inactive state.

[0096] In some applications, the equalization circuit is in a non-activated state, indicating that it has no temperature impact on the temperature sensor. It is understandable that if the equalization circuit is determined to have no temperature impact on the temperature sensor, then the target temperature compensation amount does not contain the reference temperature compensation amount corresponding to the equalization circuit being in an activated state.

[0097] In the above scheme, the equalization circuit will dissipate heat when it is in the start-up state. By considering the working state of the equalization circuit, it can be determined whether the temperature sensor is affected by the heat dissipated by the equalization circuit during the process of collecting the initial temperature.

[0098] In some embodiments, the reference temperature compensation amount corresponding to the equalization circuit being in the activated state in the correspondence is obtained in advance. The method for obtaining the reference temperature compensation amount corresponding to the equalization circuit being in the activated state in the correspondence includes: obtaining a first temperature collected by a temperature sensor from a target object when the equalization circuit is in the activated state, the target object being the object being measured by the temperature sensor; and obtaining a second temperature collected by the temperature sensor from the target object when the equalization circuit is not in the activated state, the target object having the same temperature in both the activated and deactivated states; and using the difference between the first temperature and the second temperature as the reference temperature compensation amount corresponding to the equalization circuit being in the activated state in the correspondence.

[0099] The target objects include, but are not limited to, individual battery cells, the environment in which the battery management system is located, and other temperature measurement objects. The temperature of the target object is kept constant. The equalization circuit is kept in a non-activated state for a period of time before switching to an activated state. This allows the temperature sensor to acquire a second temperature when the equalization circuit is in a non-activated state and a first temperature when the equalization circuit is in an activated state. The difference between the first and second temperatures can be used as the reference temperature compensation amount corresponding to the equalization circuit being in an activated state in the corresponding relationship.

[0100] In the above scheme, by obtaining the temperature difference between the temperature collected by the temperature sensor on the target object at the same temperature when the equalization circuit is in the start-up state and not in the start-up state, the influence of the heat dissipation of the equalization circuit on the temperature collected by the temperature sensor can be determined, thereby determining the temperature compensation amount when the equalization circuit is in the start-up state.

[0101] In some embodiments, the temperature sampling chip further includes functional circuitry. The method described above for determining the actual temperature of a battery cell based on an initial temperature and a reference temperature compensation amount can be as follows: A target temperature compensation amount is obtained by combining the reference temperature compensation amount with a preset temperature compensation amount related to the functional circuitry. The initial temperature is then compensated using the target temperature compensation amount to obtain the actual temperature of the battery cell.

[0102] The functional circuitry includes all circuitry in the temperature sampling chip except for the equalization circuitry. For example, the circuitry in the temperature sampling chip excluding the equalization circuitry includes, but is not limited to, a voltage sampling circuitry. The second temperature effect can be considered as the presence of a second temperature effect if the temperature sampling chip is in the active state. The target temperature compensation amount can be obtained by combining the reference temperature compensation amount and the preset temperature compensation amount related to the functional circuitry, which can be obtained by summing the reference temperature compensation amount corresponding to the active state of the equalization circuit with the preset temperature compensation amount. In some application scenarios, if the equalization circuitry does not have a temperature effect on the temperature sensor, i.e., there is no reference temperature compensation amount corresponding to the active state of the equalization circuitry in the corresponding relationship, the preset temperature compensation amount can be directly used as the target temperature compensation amount. In other words, the preset temperature compensation amount is a fixed part of the target temperature compensation amount, while the reference temperature compensation amount corresponding to the active state of the equalization circuitry in the corresponding relationship is an optional part of the target temperature compensation amount.

[0103] In the above scheme, in addition to the equalization circuit, the components in the functional circuit of the temperature sampling chip may also generate heat during operation and affect the temperature sensor. Combining the effects of the equalization circuit and the functional circuit on the temperature sensor, the target temperature compensation amount is determined to be more accurate.

[0104] In some embodiments, the preset temperature compensation amount is obtained in advance. The method for obtaining the preset temperature compensation amount in advance includes: obtaining at least one third temperature collected by a temperature sensor from a reference object with a known temperature when the equalization circuit is in a non-activated state. The reference object is the object being measured by the temperature sensor. Then, the preset temperature compensation amount is determined based on the difference between the at least one third temperature and the known temperature of the reference object.

[0105] Keeping the equalization circuit in a non-activated state can reduce the temperature impact caused by heat dissipation from the equalization circuit. There can be at least one or more reference objects. Reference objects include, but are not limited to, individual battery cells, battery modules, or the environment. The reference object is relatively independent of the target object mentioned above; they can be the same or different. The environment can be understood as the space where the battery management system is located. The known temperature of the environment is the actual temperature of the environment, which can be measured using a thermometer or similar means. The difference between at least one third temperature and the known temperature of the reference object includes the differences between each third temperature and the known temperature of the reference object. Based on the differences between at least one third temperature and the known temperature of the reference object, the preset temperature compensation amount can be determined by statistically analyzing each difference and using the statistical value as the preset temperature compensation amount. Statistical values ​​include, but are not limited to, the mean, random number, mode, or median.

[0106] In the above scheme, when the control equalization circuit is in the non-start state, if it is not affected by the heat dissipation of the temperature sampling chip, the temperature collected by the temperature sensor from the reference object with a known temperature should have a small difference or even be equal to the known temperature. If the temperature collected by the temperature sensor differs greatly from the known temperature, it indicates that it is affected by other circuits in the battery sampling chip, and the temperature difference can be used as a preset temperature compensation amount.

[0107] In some embodiments, the temperature detection method further includes the following steps: determining the operating time of the temperature sampling chip; and determining, from the correlation between the operating time and the candidate temperature compensation amount, a candidate temperature compensation amount corresponding to the operating time of the temperature sampling chip, as a preset temperature compensation amount.

[0108] The operating time of the temperature sampling chip can be the duration of operation after the current startup, that is, the duration of continuous operation after the temperature sampling chip's state changes from a non-startup state to a startup state. Since the accumulated heat generated when the temperature sampling chip first changes from a non-startup state to a startup state and before reaching thermal equilibrium may fluctuate, some embodiments can set corresponding preset temperature compensation amounts for different operating times before reaching thermal equilibrium. It is understood that the preset temperature compensation amounts corresponding to different operating times of the temperature sampling chip in this embodiment are relatively independent of the reference temperature compensation amount corresponding to the equalization circuit being in the startup state in the above correspondence. The method of using the candidate temperature compensation amount corresponding to the operating time of the temperature sampling chip as the preset temperature compensation amount can be either to find the operating time closest to the current operating time of the temperature sampling chip and use its corresponding reference temperature compensation amount as the preset temperature compensation amount, or to average the candidate temperature compensation amounts corresponding to the two closest operating times to obtain the preset temperature compensation amount. In other words, different reference temperature compensation amounts can be used as preset temperature compensation amounts when the temperature sampling chip performs temperature compensation at different operating times. Alternatively, the relationship could be a curve showing the relationship between a preset temperature compensation amount and the working time, through which the preset temperature compensation amount under different working times can be determined.

[0109] In the above scheme, the longer the temperature sampling chip operates, the more heat it may accumulate. By obtaining the temperature compensation amount of the temperature sampling chip under different operating times, the corresponding preset temperature compensation amount can be determined based on the operating time of the temperature sampling chip. Compared with using the same temperature compensation amount for the temperature sampling chip under different operating times, the preset temperature compensation amount determined by this scheme is more accurate.

[0110] In some embodiments, the reference object is the environment in which the battery management system is located, and each third temperature is the temperature of the collected environment.

[0111] In some applications, the mounting component can be a mounting plate. After the mounting component is assembled with the battery cell, the temperature sampling chip can be positioned on the side of the mounting component furthest from the battery cell, while the temperature sensor can be positioned on the side closer to the battery cell. Specifically, the distance between the temperature sensor and the negative terminal of the battery cell is less than the distance between the temperature sensor and the positive terminal of the battery cell. The temperature sampling chip can directly detect the temperature of the environment in which the battery management system operates. If the actual ambient temperature is known, the difference between the detected ambient temperature and the actual ambient temperature can be used as a preset temperature compensation amount.

[0112] In the above scheme, the battery management system can calibrate the compensation amount by simply detecting the ambient temperature without relying on individual battery cells, making the calibration process more convenient.

[0113] In some embodiments, there are multiple temperature sensors, and each temperature sensor has a corresponding reference temperature compensation value. Step S13 above may include the following steps: for the initial temperature collected by each temperature sensor, temperature compensation is performed on the initial temperature based on the target temperature compensation value corresponding to the temperature sensor to obtain the compensated temperature; based on each compensated temperature, the actual temperature is obtained.

[0114] The method of compensating the initial temperature based on the target temperature compensation amount corresponding to the temperature sensor to obtain the compensated temperature can refer to the above method of determining the target temperature compensation amount based on the reference temperature compensation amount and the preset temperature compensation amount, and then using the target temperature compensation amount to compensate the initial temperature to obtain the compensated temperature. Alternatively, the reference temperature compensation amount can be directly used to compensate the initial temperature to obtain the compensated temperature. Because the positional relationship between different temperature sensors and the temperature sampling chip is different, the influence of the temperature sampling chip on the temperature of different temperature sensors will also be different. Therefore, in the correspondence between different temperature sensors, the reference temperature compensation amount corresponding to the equalization circuit in the activated state is relatively independent, and the preset temperature compensation amount of different temperature sensors is relatively independent. Different temperature sensors detect the temperature of the same battery cell, so the compensated temperatures corresponding to different temperature sensors should have small differences. The compensated temperatures can be statistically analyzed, and the statistical values ​​can be used as the actual temperatures. The types of statistical values ​​can be referred to the above.

[0115] In the above scheme, by setting up multiple temperature sensors, the compensated temperature determined by the multiple temperature sensors can achieve a mutual verification effect, thereby making the determined actual temperature more accurate.

[0116] In some embodiments, the method of obtaining the actual temperature based on each compensated temperature may be: in response to the difference between each compensated temperature being less than or equal to a preset difference, using the statistical value of each compensated temperature as the actual temperature; or, in response to the difference between each compensated temperature being greater than a preset difference, determining a temperature detection anomaly and issuing a prompt message.

[0117] In other words, if there is a significant difference between the compensated temperatures obtained from different temperature sensors after temperature compensation, it indicates a possible temperature sensor malfunction or other cause, confirming an abnormal temperature detection and issuing a warning message. If the difference between the compensated temperatures is small, it indicates that the temperature detection is normal, and the statistical value of each compensated temperature is taken as the actual temperature. The preset difference can be set according to requirements.

[0118] In the above scheme, if the difference between each compensated temperature is small, it means that each compensated temperature is reliable. If the difference between each compensated temperature is large, it means that at least some of the compensated temperatures are unreliable. This may be due to reasons such as damage to the temperature sensor. In this case, a prompt message can be sent to allow for the repair of each temperature sensor.

[0119] In some embodiments, the temperature sampling chip is an AFE (Automatic External Wire). The temperature sampling chip is integrated to one side of the mounting component via a fastener. A groove is formed on the other side of the mounting component, and a temperature sensor is arranged within the groove. The temperature sensor can be an NTC (Natural Temperature Controller). Additionally, thermally conductive adhesive, such as DOW TC4515 AB adhesive, is used to fill the space between the temperature sensor and the top cover of the battery cell.

[0120] After acquiring the initial temperature from the temperature sensor, the temperature sampling chip determines whether there is a reference temperature compensation amount based on whether the equalization circuit in the temperature sampling chip is in the activated state. If there is a reference temperature compensation amount, the reference temperature compensation amount is added to the preset temperature compensation amount to obtain the target temperature compensation amount. If there is no reference temperature compensation amount, the preset temperature compensation amount is used as the target temperature compensation amount.

[0121] Because the positions of the temperature sensor and temperature sampling chip are fixed in actual products, the reference temperature compensation and preset temperature compensation can also be predetermined. Furthermore, the closer the temperature sensor is to the temperature sampling chip, the larger the preset temperature compensation; the closer the temperature sensor is to the area where the equalization circuit is located, the larger the reference temperature compensation. Since the equalization circuit is located within the temperature sampling chip, the distance between the temperature sensor and the temperature sampling chip can be equivalent to the distance between the temperature sensor and the equalization circuit.

[0122] In other embodiments, the number of temperature sensors can be two or more. The initial temperature collected by the temperature sensors is compensated to obtain the compensated temperature. The compensated temperatures can be cross-verified to determine whether the detected temperature is reliable.

[0123] Please refer to Figure 8, which is a schematic diagram of a framework of an embodiment of the computer-readable storage medium of this application. The computer-readable storage medium 40 stores program instructions 401 that can be executed by a processor. The program instructions 401 are used to implement the steps in the above-described temperature detection method embodiment.

[0124] In the above scheme, the battery management system includes a temperature sensor and a temperature sampling chip. The heat generated by the temperature sampling chip during operation may affect the temperature collected by the temperature sensor. Furthermore, the heat generated or accumulated by the temperature sampling chip under different operating conditions may vary, which will lead to differences in the impact on the temperature collected by the temperature sensor. By considering the operating state of the temperature sampling chip and adjusting the initial temperature, a more accurate temperature of the battery cell can be obtained.

[0125] In some embodiments, the functions or modules of the apparatus provided in this disclosure can be used to perform the methods described in the above method embodiments. The specific implementation can be referred to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0126] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0127] In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus can be implemented in other ways. For example, the apparatus implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. In another image location, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0128] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A temperature detection method characterized by, The temperature detection method is applied to a battery management system, which includes a temperature sensor and a temperature sampling chip. The temperature sensor is connected to the temperature sampling chip. The temperature detection method includes: The initial temperature of the battery cell is obtained from the temperature sensor. Obtain the operating status of the temperature sampling chip; Based on the initial temperature and the operating state of the temperature sampling chip, the actual temperature of the battery cell is obtained.

2. The temperature detecting method according to claim 1, wherein The process of obtaining the actual temperature of the battery cell based on the initial temperature and the operating state of the temperature sampling chip includes: Based on the working state of the temperature sampling chip and the correspondence between the preset reference temperature compensation amount and the working state, the reference temperature compensation amount corresponding to the working state of the temperature sampling chip is determined. The actual temperature of the battery cell is determined based on the initial temperature and the reference temperature compensation amount.

3. The temperature detecting method according to claim 2, wherein The temperature sampling chip includes an equalization circuit. The operating state of the temperature sampling chip includes the equalization circuit being in an active state or a non-active state. Determining the reference temperature compensation amount corresponding to the operating state of the temperature sampling chip based on the operating state of the temperature sampling chip and a preset correspondence between the reference temperature compensation amount and the operating state includes: In response to the operating state of the temperature sampling chip being the same as the equalization circuit being in the activated state, the reference temperature compensation amount corresponding to the activated state of the equalization circuit in the correspondence is determined as the reference temperature compensation amount corresponding to the operating state of the temperature sampling chip.

4. The temperature detecting method according to claim 3, wherein The reference temperature compensation amount corresponding to the equalization circuit being in the activated state in the correspondence relationship is obtained in advance. The methods for obtaining the reference temperature compensation amount corresponding to the equalization circuit being in the activated state in the correspondence relationship in advance include: The first temperature of the target object is acquired by the temperature sensor when the equalization circuit is in the activated state, wherein the target object is the object to which the temperature sensor measures temperature; and, The second temperature of the target object is obtained by the temperature sensor when the equalization circuit is in the non-starting state, and the temperature of the target object is the same when the equalization circuit is in the starting state and the non-starting state. The difference between the first temperature and the second temperature is used as the reference temperature compensation amount corresponding to the activation state of the equalization circuit in the correspondence.

5. The temperature detecting method according to claim 3 or 4, characterized by, The temperature sampling chip also includes a functional circuit, wherein determining the actual temperature of the battery cell based on the initial temperature and the reference temperature compensation amount includes: The target temperature compensation amount is obtained by combining the reference temperature compensation amount and the preset temperature compensation amount related to the functional circuit. The initial temperature is compensated using the target temperature compensation amount to obtain the actual temperature of the battery cell.

6. The temperature detecting method according to claim 5, wherein The preset temperature compensation amount is obtained in advance, and the methods for obtaining the preset temperature compensation amount in advance include: The equalization circuit is in a non-start state when the temperature sensor collects at least one third temperature from a reference object with a known temperature, where the reference object is the object being measured by the temperature sensor. The preset temperature compensation amount is determined based on the difference between the at least one third temperature and the known temperature of the reference object.

7. The temperature detecting method according to claim 5, wherein The temperature detection method further includes: Determine the operating time of the temperature sampling chip; The candidate temperature compensation amount corresponding to the working time of the temperature sampling chip is determined from the correlation between working time and candidate temperature compensation amount, and is used as the preset temperature compensation amount.

8. The temperature detecting method according to claim 6, wherein The reference object is the environment in which the battery management system is located, and each of the third temperatures is the temperature of the environment collected.

9. The temperature detecting method according to any one of claims 2 to 4, characterized by, The number of temperature sensors is multiple, and each temperature sensor has a corresponding reference temperature compensation value. Determining the actual temperature of the battery cell based on the initial temperature and the reference temperature compensation value includes: For each of the temperature sensors, the initial temperature is compensated based on the reference temperature compensation amount corresponding to the temperature sensor to obtain the compensated temperature. The actual temperature is obtained based on the compensated temperatures described above.

10. The temperature detecting method according to claim 9, wherein The process of obtaining the actual temperature based on each of the compensated temperatures includes: In response to the fact that the difference between each of the compensated temperatures is less than or equal to a preset difference, the statistical value of each of the compensated temperatures is taken as the actual value; Alternatively, in response to the difference between the compensated temperatures being greater than a preset difference, an abnormal temperature detection is determined and a prompt message is issued.

11. A battery management system, characterized by, The battery management system is used to perform the temperature detection method as described in any one of claims 1 to 10, wherein the battery management system includes: a temperature sensor and a temperature sampling chip.

12. The battery management system of claim 11, wherein, The battery management system includes a mounting component, the temperature sampling chip is disposed on one side of the mounting component, and each of the temperature sensors is disposed on the other side of the mounting component. The mounting component is used to cooperate with a battery cell to establish a connection between the battery management system and the battery cell.

13. The battery management system of claim 12, wherein, The mounting component has a groove, and the temperature sensor is placed in the groove. The groove is filled with a thermally conductive medium, which is positioned on the side of the temperature sensor facing the opening of the groove, so that when the battery management system cooperates with the battery cell, the thermally conductive medium is located between the temperature sensor and the battery cell.

14. The battery management system of claim 12 or 13, wherein, The battery management system includes a fixing component, and the temperature sampling chip is disposed between the fixing component and the mounting component. The fixing component is used to cooperate with the mounting component to fix the temperature sampling chip on the mounting component.

15. A battery, characterized by The battery includes a battery cell and a battery management system as described in claims 11 to 14, wherein the battery management system is connected to the battery cell.

16. The battery of claim 15, wherein, The battery management system includes a mounting component. A temperature sampling chip in the battery management system is located on the side of the mounting component away from the battery cell. Each temperature sensor in the battery management system is located on the side of the mounting component close to the battery cell. The mounting component cooperates with the top cover of the battery cell so that each temperature sensor can measure the temperature of the top cover of the battery cell.

17. The battery of claim 16, wherein, The distance between the temperature sensor and the negative electrode of the battery cell is less than the distance between the temperature sensor and the positive electrode of the battery cell.

18. An electrical device, comprising: The power consuming device comprises the battery as claimed in claims 15 to 17.

19. A computer readable storage medium having stored thereon program instructions, wherein, The program instructions, when executed by a processor, implement the temperature detection method as claimed in any one of claims 1 to 10.

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