Battery cell, battery module, battery, electronic device, mobile device, and energy storage device

Abstract

The application provides an electric core, a battery module, a battery, an electronic device, a mobile device and an energy storage device. The electric core comprises a bare electric core, an electric core shell, a first temperature sensing magnet and a first dry reed. The first temperature sensing magnet is used for sensing the temperature inside the electric core. If the temperature inside the electric core is equal to or higher than the Curie temperature of the first temperature sensing magnet, the magnetism of the first temperature sensing magnet disappears, and the Curie temperature of the first temperature sensing magnet matches the critical temperature of thermal runaway of the electric core. After the magnetism of the first temperature sensing magnet disappears, the conduction state of the first dry reed changes, so that the battery management system determines that the electric core has a thermal anomaly after detecting the change of the conduction state of the first dry reed. Therefore, the thermal anomaly of the electric core can be accurately and timely warned.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery module, battery, electronic device, mobile device, and energy storage device. Background Technology

[0002] The demand for lithium-ion batteries is growing rapidly in applications such as new energy vehicles, electric bicycles, and portable energy storage. Currently, the energy density and power density of lithium-ion battery cells are increasing daily, necessitating that cells and batteries address more stringent safety challenges.

[0003] Due to factors such as abuse failure, reliability failure, design defects, and manufacturing defects, abnormal thermal conditions of battery cells are often caused, and overheating failure of battery cells and batteries may even occur, leading to safety problems such as fire, spontaneous combustion, and explosion.

[0004] Therefore, how to accurately detect thermal anomalies in battery cells is an urgent problem to be solved. Summary of the Invention

[0005] This application provides a battery cell, battery module, battery, electronic device, mobile device, and energy storage device that can provide accurate and timely early warning of thermal anomalies in the battery cell.

[0006] In a first aspect, this application provides a battery cell, comprising: a bare battery cell, an electrolyte, a battery cell housing, a first temperature-sensing magnet, and a first dry reed switch;

[0007] The battery cell housing is made of non-magnetic shielding material. The battery cell housing has a receiving cavity, which is filled with electrolyte. The bare battery cell is placed inside the receiving cavity. The first temperature-sensing magnet is placed inside or outside the receiving cavity. The first dry reed switch is placed outside the receiving cavity. The first dry reed switch is used for electrical connection with the battery management system.

[0008] The first temperature-sensing magnet is used to sense the temperature inside the battery cell; if the temperature inside the battery cell is equal to or higher than the Curie temperature of the first temperature-sensing magnet, the magnetism of the first temperature-sensing magnet disappears, and the Curie temperature of the first temperature-sensing magnet matches the thermal runaway critical temperature of the battery cell.

[0009] After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed switch changes, so that the battery management system can determine that the cell has a thermal abnormality after detecting the change in the conduction state of the first dry reed switch.

[0010] The battery provided in the first aspect, through the cooperation of the first temperature-sensing magnet and the first dry reed switch, can accurately detect the temperature of the battery cell when thermal anomalies occur. This allows for accurate and timely early warning of such anomalies, solving the problem of delayed or inaccurate early warning responses to internal thermal anomalies within the battery cell. This improves the response speed for early warning of thermal anomalies and enhances the battery's safety protection capabilities. Simultaneously, utilizing a wireless magnetic induction detection method, based on the layout of the temperature-sensing devices such as the first temperature-sensing magnet and the first dry reed switch, avoids damaging the integrity of the battery cell casing, preventing issues such as encapsulation leakage. This helps extend the battery's lifespan, ensures battery reliability and safety, and facilitates large-scale mass production and use.

[0011] Furthermore, the cooperation between the first temperature-sensing magnet and the first dry reed switch in the battery provided by the first aspect can also record whether the first temperature-sensing magnet has undergone a magnetic change, and / or whether the conduction state of the first dry reed switch has changed. The aforementioned situations can serve as the basis for identifying whether the battery cell has overheated abnormally, thus avoiding the safety risks caused by the battery cell overheating abnormally, and also preventing the battery cell with such safety risks from continuing to flow into the next processing and use stage, thereby avoiding causing greater system safety problems.

[0012] In one possible design, the battery cell further includes: a second temperature-sensing magnet and a second dry reed switch; wherein the Curie temperature of the second temperature-sensing magnet is different from that of the first temperature-sensing magnet, the second temperature-sensing magnet is placed inside or outside the receiving cavity, the second dry reed switch is placed outside the receiving cavity, and the second dry reed switch and the first dry reed switch are respectively used for electrical connection with different sampling channels of the battery management system;

[0013] After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed switch changes, so that the battery management system determines that the cell has a thermal abnormality after detecting the change in the conduction state of the first dry reed switch. Specifically, after the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed switch changes, so that the battery management system determines that the cell has a first degree of thermal abnormality after detecting the change in the conduction state of the first dry reed switch.

[0014] The second temperature-sensing magnet is used to sense the temperature inside the battery cell. If the temperature inside the battery cell is equal to or higher than the Curie temperature of the second temperature-sensing magnet, the magnetism of the second temperature-sensing magnet disappears, and the Curie temperature of the second temperature-sensing magnet matches the thermal runaway critical temperature of the battery cell.

[0015] After the magnetism of the second temperature-sensing magnet disappears, the conduction state of the second dry reed switch changes, so that the battery management system determines that the cell has experienced a second degree of thermal anomaly after detecting the change in the conduction state of the second dry reed switch. The second degree is different from the first degree.

[0016] The battery provided by this embodiment allows for the deployment of first and second temperature-sensing magnets with different Curie temperatures within the same cell. By electrically connecting the first and second dry reed switches to different sampling channels of the battery management system, the battery management system can determine the degree of thermal anomaly in the same cell and the corresponding temperature level reached. This enables the battery management system to implement different levels of safety protection strategies based on the degree of thermal anomaly in the cell, thus achieving over-temperature warning functions for different levels of the same cell.

[0017] Among them, the critical temperature for thermal runaway of the battery cell is greater than the maximum temperature during normal operation of the battery cell.

[0018] In one possible design, the Curie temperature of the first or second thermosensitive magnet is lower than the thermal runaway critical temperature of the battery cell.

[0019] Considering that the Curie temperature of the first temperature-sensing magnet might be set too close to the thermal runaway critical temperature of the battery cell, a situation might arise where the battery cell has actually experienced a thermal anomaly, but the battery management system has not issued a warning. Therefore, this application can set the Curie temperature of the second temperature-sensing magnet to be lower than the Curie temperature of the first temperature-sensing magnet, and the Curie temperature of the first temperature-sensing magnet to be lower than the thermal runaway critical temperature of the battery cell. This allows the second temperature-sensing magnet to quickly detect thermal anomalies in the battery cell, solving the problem of insufficient warning timeliness caused by setting the Curie temperature of a single temperature-sensing magnet too high. Alternatively, considering that the Curie temperature of the first temperature-sensing magnet might also be set much lower than the thermal runaway critical temperature of the battery cell, a situation might arise where the battery management system has already issued a warning before the battery cell has actually experienced a thermal anomaly. Based on this, the Curie temperature of the second temperature-sensing magnet can be set to be greater than that of the first temperature-sensing magnet, and the Curie temperature of the second temperature-sensing magnet can be set to be less than the thermal runaway critical temperature of the battery cell. Thus, by setting the second temperature-sensing magnet, the thermal anomaly of the battery cell can be accurately detected, solving the problem of excessively frequent warnings caused by setting the Curie temperature of a single temperature-sensing magnet too low.

[0020] In summary, this application can be equipped with multiple sets of paired temperature-sensing magnets and dry reed switches, such as two, three, or four sets, enabling the battery management system to promptly adopt corresponding battery over-temperature management strategies based on different degrees of thermal anomalies in the battery cells. These strategies include cooling the battery cooling system or disconnecting the main circuit, preventing the internal temperature of the battery cells from continuing to rise. This prevents thermal anomalies of the corresponding degree to the thermal runaway critical temperature caused by the continued rise in the internal temperature of the battery cells. It can also accurately realize the battery over-temperature warning function of the battery cells, saving the overhead caused by excessive warnings due to inaccurate warnings, and is conducive to the continuous and normal power supply of the battery.

[0021] In one possible design, the dry reed is a normally open dry reed;

[0022] After the magnetism of the temperature-sensing magnet disappears, the conduction state of the dry reed switch changes from a low-impedance conducting state to a high-impedance non-conducting state.

[0023] In one possible design, the dry reed is a normally closed dry reed;

[0024] After the magnetism of the temperature-sensing magnet disappears, the conduction state of the dry reed switch changes from a high-impedance non-conducting state to a low-impedance conducting state.

[0025] In one possible design, the dry reed is a switching type dry reed, with the first and second ends of the dry reed forming a first channel, and the first and third ends of the dry reed forming a second channel.

[0026] After the magnetism of the temperature-sensing magnet disappears, the conduction state of the first channel changes from a low-impedance conduction state to a high-impedance non-conducting state, and the conduction state of the second channel changes from a high-impedance non-conducting state to a low-impedance conduction state.

[0027] The battery provided by this embodiment offers several feasible implementation methods for a dry reed switch in a battery.

[0028] In one possible design, the dry reed switch is fixed to the outer surface of the cell housing;

[0029] Alternatively, a dry reed switch can be fixed to the outside of the cell housing.

[0030] In one possible design, the temperature-sensing magnet is fixed to the inner surface of the cell housing;

[0031] Alternatively, the temperature-sensing magnet is fixed to the outer surface of the cell casing;

[0032] Alternatively, the temperature-sensing magnet can be fixed to the outside of the cell casing.

[0033] Secondly, this application provides a battery module, including: at least one battery cell in any possible design of the first aspect.

[0034] In one possible design, when the battery module includes a first cell and a second cell, the dry reed switch in the first cell is connected in series with the dry reed switch in the second cell.

[0035] In one possible design, when the battery module includes a first cell and a second cell, the dry reed switch in the first cell is electrically connected in parallel with the dry reed switch in the second cell.

[0036] The dry reed switch in the first cell and the dry reed switch in the second cell are also used for electrical connection with the same sampling channel of the battery management system, so that the battery management system determines that there is a thermal abnormality in the first cell and the second cell after detecting a change in the conduction state of the dry reed switch in the first cell and / or the conduction state of the dry reed switch in the second cell.

[0037] The battery module provided by this embodiment connects the dry reed switches in multiple cells in series and / or in parallel, and connects them to the same sampling channel of the battery management system. This enables the battery management system to monitor whether thermal anomalies occur in the cells, solving the problem of the limited number of sampling channels in the battery management system. It also improves the response speed for early warning of thermal anomalies in multiple cells, which is beneficial to improving the sensitivity and reliability of detection.

[0038] The beneficial effects of the battery module provided in the second aspect above can be seen in the first aspect and the beneficial effects of any possible implementation of the first aspect, and will not be repeated here.

[0039] Thirdly, this application provides a battery, including: a battery management system and a battery module in the second aspect and any possible design of the second aspect;

[0040] The battery management system is used to detect the conduction state of the first dry reed switch, and determines that a thermal abnormality has occurred in the battery cell after detecting a change in the conduction state of the first dry reed switch.

[0041] In one possible design, the battery management system includes: a detection module and a host unit;

[0042] The detection module is electrically connected to the dry reed switch in the battery module, and the detection module is also electrically connected to the host unit.

[0043] The detection module is used to send the detection result to the host unit after detecting a change in the conduction state of the dry reed switch;

[0044] The host unit is used to determine, after receiving the detection results, that a thermal anomaly has occurred in the cell in the battery module corresponding to the dry reed switch.

[0045] The detection module is integrated into the host unit; or the detection module is separate from the host unit.

[0046] The beneficial effects of the battery provided in the third aspect can be seen in the beneficial effects of the second aspect and any possible implementation of the second aspect, and will not be repeated here.

[0047] Fourthly, this application provides an electronic device, including: a battery in the third aspect and any possible design of the third aspect.

[0048] Fifthly, this application provides a mobile device, including: a battery in the third aspect and any possible design of the third aspect.

[0049] Sixthly, this application provides an energy storage device, including: a battery in the third aspect and any possible design of the third aspect.

[0050] The beneficial effects of the electronic devices, mobile devices, and energy storage devices provided in the above aspects can be found in the third aspect and the beneficial effects of various possible embodiments of the third aspect, and will not be repeated here. Attached Figure Description

[0051] Figure 1 A schematic diagram illustrating a battery over-temperature management strategy provided in an embodiment of this application;

[0052] Figure 2 This is a schematic diagram of the architecture of a battery provided in one embodiment of this application;

[0053] Figure 3 This is a partial structural diagram of a battery provided in one embodiment of this application;

[0054] Figure 4 This is a schematic flowchart illustrating a battery thermal anomaly early warning method provided in an embodiment of this application;

[0055] Figure 5 A Semenov thermogram is provided as an embodiment of this application;

[0056] Figure 6 This is a schematic diagram illustrating the relationship between the magnetism and temperature of a temperature-sensitive magnet according to an embodiment of this application;

[0057] Figure 7 A schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0058] Figure 8 A schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0059] Figure 9 This is a partial structural diagram of a battery provided in one embodiment of this application;

[0060] Figure 10 A schematic diagram illustrating the working principle of a normally open dry reed switch according to an embodiment of this application;

[0061] Figure 11A schematic diagram illustrating the working principle of a normally closed dry reed switch according to an embodiment of this application;

[0062] Figure 12A This is a partial structural diagram of a battery provided in one embodiment of this application;

[0063] Figure 12B A schematic diagram illustrating the working principle of a switching dry reed switch provided in one embodiment of this application;

[0064] Figure 13 A schematic diagram of the architecture of a detection module provided in one embodiment of this application;

[0065] Figure 14 A schematic diagram of the architecture of a detection module provided in one embodiment of this application;

[0066] Figure 15 This is a partial structural diagram of a battery provided in one embodiment of this application;

[0067] Figure 16 This is a schematic flowchart illustrating a battery thermal anomaly early warning method provided in an embodiment of this application;

[0068] Figure 17 This is a partial structural diagram of a battery provided in one embodiment of this application;

[0069] Figure 18 This is a partial structural diagram of a battery provided in one embodiment of this application;

[0070] Figure 19 This is a partial structural diagram of a battery provided in one embodiment of this application;

[0071] Figure 20 This is a partial structural diagram of a battery provided in one embodiment of this application;

[0072] Figure 21 This is a partial structural diagram of a battery provided in an embodiment of this application.

[0073] Explanation of reference numerals in the attached figures:

[0074] 1—Battery;

[0075] 10—Battery module; 20—Battery management system;

[0076] 100—cell; 100a—first cell; 100b—second cell;

[0077] 101—Bare battery cell; 102—Battery cell casing; 103—First temperature-sensing magnet; 104—First dry reed switch;

[0078] 105—Second temperature-sensing magnet; 106—Second dry reed switch; 107—Electrolyte;

[0079] 201—Detection module; 202—Host unit. Detailed Implementation

[0080] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “rear,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0081] A traditional method for detecting battery thermal anomalies typically uses a thermistor with a negative temperature coefficient (NTC) to measure the internal temperature of the battery cell. The thermistor then transmits the measured temperature data to the battery management system (BMS), which in turn adjusts the temperature of the battery or battery pack based on this data, thus enabling the monitoring and protection against battery thermal anomalies.

[0082] Another traditional approach to battery thermal anomaly detection involves connecting a fuse in series between the terminal and the tab of the battery cell. In scenarios where high current causes thermal anomalies, this fuse can thermally melt, cutting off the current circuit and ensuring battery thermal safety. However, this fuse is unsuitable for scenarios involving internal short circuits or external fires within the battery cell.

[0083] The two solutions described above have the following problems regarding the detection process of battery thermal anomalies:

[0084] 1. The early warning deviation for abnormal cell thermal activity is large.

[0085] Because the core electrode assemblies inside a battery cell are typically stacked or wound, the thermal conductivity of these assemblies differs significantly between the stacking direction and the perpendicular direction, resulting in a pronounced three-dimensional temperature effect within the cell. When a thermal anomaly occurs inside the cell, the initial heat source is usually a point-source heat source. The heat generated by this initial heat source needs to pass through multiple components (such as the cell's electrode assemblies / tabs / terminals) and different contact surfaces to reach the cell's casing surface, creating a significant temperature difference between the cell's interior and its casing surface.

[0086] Therefore, temperature probes placed on the surface of the battery cell casing will not be able to accurately detect the temperature inside the battery cell, resulting in an inability to accurately warn of thermal anomalies in the battery cell.

[0087] 2. Delayed early warning time for abnormal cell thermal activity

[0088] When a thermal anomaly occurs in a battery cell, the heat generated by the heat source is transferred to the surface of the battery cell's casing through multiple components and different contact surfaces, and there is a significant time lag in the temperature rise of the resistor's casing surface.

[0089] 3. The number of detection points in the battery pack is relatively small.

[0090] Due to the limitation of the number of sampling channels in the BMS, it is not possible to deploy detection positions for each cell in the battery pack, nor is it possible to deploy too many detection positions for the same cell. This results in the inability to monitor the temperature status of each cell in real time and comprehensively, and it is also impossible to respond quickly to local thermal anomalies in the cells.

[0091] 4. Unable to determine whether the battery cell has overheated abnormally.

[0092] When a battery cell experiences overheating, its internal structure, separator, material system, and electrochemical interface all suffer irreversible damage. However, the relevant inspection process sets up the warning function at the battery module or battery level, which is separate from the battery cell itself. This makes it impossible to record battery cells that have experienced overheating, which is detrimental to the monitoring and identification of battery cells in all stages of production, transportation, storage, and use.

[0093] To address the aforementioned issues, this application provides a battery cell, battery module, battery, electronic device, mobile device, and energy storage device, which can be applied to various backup power scenarios.

[0094] Among them, electronic devices can be mobile phones (such as foldable screen phones, large screen phones, etc.), tablet computers, laptops, wearable devices, augmented reality (AR) / virtual reality (VR) devices, ultra-mobile personal computers (UMPCs), netbooks, personal digital assistants (PDAs), smart TVs, smart screens, high-definition TVs, 4K TVs, smart speakers, smart projectors, etc. This application does not impose any restrictions on the specific types of electronic devices.

[0095] The mobile device can be a vehicle-mounted device, such as an electric car or an electric bicycle.

[0096] Among them, energy storage devices can be communication sites, data centers, energy storage power stations, etc.

[0097] For any given battery cell, the corresponding battery management system can determine whether the cell has experienced a thermal anomaly by using temperature-sensing devices such as temperature-sensing magnets and dry reed switches, as well as by using wireless magnetic induction detection response methods.

[0098] Therefore, the battery management system can adopt corresponding battery over-temperature management strategies. These strategies include processing various input signals, making management decisions, and implementing control measures such as thermal safety warnings, cooling the battery cooling system, and disconnecting the main circuit of the battery module.

[0099] Below, in conjunction with Figure 1 This section details the working principle of the battery management system in implementing battery over-temperature management strategies.

[0100] Please see Figure 1 , Figure 1 A schematic diagram of a battery over-temperature management strategy provided in an embodiment of this application is shown.

[0101] like Figure 1 As shown, a temperature-sensing magnet is used to detect the internal temperature of the battery cell; that is, the ambient temperature T1 of the temperature-sensing magnet is the internal temperature T of the battery cell. Cell When a battery cell experiences a thermal anomaly, the temperature change can trigger a magnetic shift in the temperature-sensing magnet, which in turn alters the conduction state of the reed switch. Therefore, the battery management system can determine that a thermal anomaly has occurred in the battery cell upon detecting this change in the reed switch's conduction state.

[0102] Therefore, by using a temperature-sensing magnet and a dry reed switch, the internal temperature of the battery cell when a thermal anomaly occurs can be accurately detected. It can also provide accurate and timely early warning of thermal anomalies in the battery cell, solving the problems of inaccurate or delayed early warning of thermal anomalies in the battery cell. This improves the response speed for early warning of thermal anomalies in the battery cell and helps to enhance the battery's safety protection capabilities.

[0103] Meanwhile, the layout of the temperature-sensing magnet and the dry reed switch facilitates the temperature-sensing magnet to detect the temperature inside the cell, and the battery management system to detect whether the conduction state of the dry reed switch has changed. Furthermore, the correlation response of the temperature-sensing magnet and the dry reed switch does not require penetrating the cell casing through a physical wiring harness.

[0104] Therefore, it does not require damaging the complete structure of the cell casing, and will not cause problems such as encapsulation leakage. This helps to extend the life of the cell, ensure the reliability and safety of the cell, and is conducive to large-scale mass production and use.

[0105] Furthermore, since the magnetic transformation of the temperature-sensing magnet is irreversible once the ambient temperature exceeds its Curie temperature, whether or not a magnetic transformation has occurred can serve as a characteristic record of whether the battery cell has experienced overheating anomalies. And / or, changes in the conduction state of the dry reed switch can be detected. Therefore, changes in the conduction state of the dry reed switch can also serve as a basis for identifying whether the battery cell has experienced overheating anomalies. This avoids the safety risks associated with battery cell overheating anomalies.

[0106] For any single battery cell, a paired temperature-sensing magnet and a dry reed switch can be set to realize the over-temperature warning function of a single battery cell, thereby improving the reliability and thermal safety of the battery cell.

[0107] The dry reed switches in the battery cells can be of the same type or multiple types, depending on factors such as the number of battery cells and the requirements of the testing conditions.

[0108] For the same battery cell, multiple sets of paired temperature-sensing magnets and dry reed switches can be deployed. The Curie temperature of the temperature-sensing magnets in each set is different, and the dry reed switches in each set are electrically connected to the battery management system through different sampling channels. This allows the battery management system to detect the degree of thermal anomaly and the corresponding temperature of the same battery cell through different sampling channels. This helps the battery management system to accurately and timely implement different levels of safety protection for the battery, realizing different levels of over-temperature warning functions for the same battery cell.

[0109] Among them, the dry reed switches with different Curie temperatures can be of the same type or multiple types, and the specific settings can be made according to factors such as the number of cells in the battery and the requirements of the test conditions.

[0110] For battery modules, one or more cells can be grouped together, with each group of cells configured as a whole with paired temperature-sensing magnets and dry reed switches. The dry reed switches in each group of cells are connected in series and / or in parallel, and are electrically connected to the battery management system through the same sampling channel. This allows the battery management system to monitor the temperature status of the group of cells together through the same sampling channel. This eliminates the impact of a limited number of detection points in the battery management system or the temperature-sensing magnets being placed in remote locations, thus avoiding the need to detect thermal anomalies in multiple cells. It also solves the problem of limited sampling channels in the battery management system, enabling over-temperature warnings for multiple cells with thermal anomalies, improving warning response speed, and enhancing the sensitivity and reliability of the warnings.

[0111] Based on the above description and in conjunction with specific embodiments, the specific implementation methods of the battery cell, battery module, and battery of this application will be described in detail.

[0112] Please see Figure 2 , Figure 2 A schematic diagram of the architecture of a battery according to an embodiment of this application is shown.

[0113] like Figure 2 As shown, the battery 1 of this application may include: a battery management system 20 and a battery module 10.

[0114] Figure 2 In this configuration, battery 1 may include: a battery management system 20 and one or more battery modules 10. Each battery management system 20 corresponds to one battery module 10. For ease of explanation, Figure 2 The following example illustrates a single battery module 10.

[0115] In addition, battery 1 may also include one or more paired battery management systems 20 and battery modules 10. Each paired battery management system 20 corresponds one-to-one with a battery module 10.

[0116] This application does not limit the specific implementation of the battery management system 20 and the battery cell 100.

[0117] Any battery module 10 of this application may include one or more battery cells 100. For ease of explanation, Figure 2The following diagram illustrates two battery cells 100 as an example. When the battery module 10 includes multiple battery cells 100, the multiple battery cells 100 can be connected in series and / or in parallel. It should be understood that multiple battery cells 100 connected in series can increase the capacity of the battery 1. Multiple battery cells 100 connected in parallel can increase the voltage of the battery 1. Multiple battery cells 100 connected in both series and parallel can increase both the capacity and voltage of the battery 1.

[0118] Based on the above description, the battery cell 100 in the battery module 10 has an over-temperature warning function.

[0119] Please see Figure 3 , Figure 3 A partial structural schematic diagram of a battery provided in one embodiment of this application is shown.

[0120] like Figure 3 As shown, the battery cell 100 of this application may include: a bare battery cell 101, an electrolyte 107, a battery cell housing 102, a first temperature-sensing magnet 103, and a first dry reed switch 104. The battery management system 20 of this application may include: a detection module 201 and a host unit 202.

[0121] Please see Figure 4 , Figure 4 This diagram illustrates a flowchart of a battery thermal anomaly early warning method according to an embodiment of this application. Based on Figures 2-3 Battery 1 shown, as Figure 4 As shown, the battery thermal anomaly early warning method of this application may include:

[0122] S101, The first temperature-sensing magnet senses the temperature inside the battery cell; wherein, if the temperature inside the battery cell is equal to or higher than the Curie temperature of the first temperature-sensing magnet, the magnetism of the first temperature-sensing magnet disappears, and the Curie temperature of the first temperature-sensing magnet matches the thermal runaway critical temperature of the battery cell.

[0123] S102. After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed switch changes.

[0124] S103. After detecting a change in the conduction state of the first dry reed switch, the battery management system determines that a thermal anomaly has occurred in the battery cell.

[0125] Based on the above description, the specific implementation methods of each module in battery 1 will be introduced in turn below.

[0126] 1. Bare battery cell 101

[0127] The thermal anomaly of cell 100 mentioned in this application can be understood as: when the internal temperature of cell 100 may be too high, cell 100 is about to experience thermal runaway or cell 100 has already experienced thermal runaway.

[0128] The bare cell 101 is a component of the cell 100. In some embodiments, the bare cell 101 may include a positive electrode, a negative electrode, and a separator. The cell 100 can be a secondary battery such as a lithium-ion cell.

[0129] Below, in conjunction with Figure 5 This section details the working principle of the thermal anomaly in battery cell 100.

[0130] Please see Figure 5 , Figure 5 This application illustrates a Semenov thermogram provided in one embodiment.

[0131] For ease of explanation, Figure 5 In the graph, the horizontal axis represents temperature (T), and the vertical axis represents rate (q), with no unit.

[0132] like Figure 5 As shown, the solid line m represents the heat generation rate q of cell 100. G Temperature T inside cell 100 Cell The relationship between the two, where the dashed line n represents the heat dissipation rate q of cell 100. L Temperature T inside cell 100 Cell The relationship between them.

[0133] Among them, the heat generation rate q of cell 100 G It is an exponential function of temperature, following the Arrheniuse equation. Therefore, the heat generation rate q of cell 100 G Temperature T inside cell 100 Cell The relationship between them can be expressed using Formula 1:

[0134] Formula 1;

[0135] Among them, the heat dissipation rate q of cell 100 L It is a linear function of temperature, following Newton's law of cooling. Therefore, the heat dissipation rate q of cell 100 L Temperature T inside cell 100 Cell The relationship between them can be expressed using Formula 2:

[0136] Formula 2.

[0137] Based on Formula 1 and Formula 2, the internal temperature T of cell 100 is... Cell Depends on: the heat generation rate q of cell 100 G The heat dissipation rate q of cell 100 LThe balance. It can be seen that at the heat generation rate q of cell 100... G The heat dissipation rate q greater than 100 of the battery cell L At that time, the internal temperature T of cell 100 Cell The thermal runaway critical temperature (or non-return temperature) T greater than 100 of the battery cell NR The accumulation of heat in battery cell 100 can cause spontaneous combustion or explosion. Specifically, the critical temperature T for thermal runaway of battery cell 100 is... NR It exceeds the maximum temperature of the battery cell during normal operation (100).

[0138] In summary, the temperature T inside cell 100 Cell The thermal runaway critical temperature T of the battery cell is greater than 100. NR Previously, it was necessary to issue an early warning for thermal anomalies in cell 100 and to activate the cooling scheme for cell 100, which would help protect the safe use of cell 100. The internal temperature T of cell 100... Cell The thermal runaway critical temperature T of the battery cell is greater than 100. NR Afterwards, it is necessary to promptly activate the safety response plan, which will help reduce personal injury and equipment damage caused by spontaneous combustion or explosion of the battery cell 100.

[0139] 2. Cell casing 102 and electrolyte 107

[0140] The battery cell housing 102 is made of a non-magnetically shielded material. Therefore, the battery cell housing 102 does not provide magnetic shielding, meaning it does not shield against electromagnetic induction. Consequently, the magnetic field lines generated by the first temperature-sensing magnet 103 can pass through the battery cell housing 102, placing the space containing the first dry reed switch 104 within a magnetic field.

[0141] This application does not limit the specific implementation of the cell casing 102. For example, the cell casing 102 may be made of materials such as aluminum, aluminum-plastic composite, glass, ceramic, plastic, or non-magnetic steel.

[0142] The battery cell housing 102 has a receiving cavity. Electrolyte 107 is injected into the receiving cavity. Thus, the bare battery cell 101 can be placed inside the receiving cavity, allowing the electrolyte 107 to fully wet the bare battery cell 101. The first temperature-sensing magnet 103 can be placed inside or outside the receiving cavity, and the first dry reed switch 104 can be placed outside the receiving cavity.

[0143] This application does not limit parameters such as size, number, and shape of the accommodating cavity.

[0144] Therefore, the battery cell housing 102 can protect the battery cell 100 and also separate the first dry reed switch 104, which is convenient for the first dry reed switch 104 to detect the magnetic field change of the first temperature-sensing magnet 103. It also facilitates the electrical connection between the first dry reed switch 104 and the battery management system 20, so as not to penetrate the battery cell housing 102, and not to damage the structure of the battery cell housing 102, ensuring the long-term use of the battery cell 100 and improving the reliability and safety of the battery cell 100.

[0145] 3. First temperature-sensing magnet 103

[0146] Temperature-sensitive magnets, also known as temperature-sensitive permanent magnets, are magnetic materials whose spontaneous magnetization drops to zero. The Curie temperature of a temperature-sensitive magnet is the temperature at which the spontaneous magnetization of the magnetic material drops to zero. It is also the critical point at which the magnetic material undergoes a magnetic transformation (i.e., from ferromagnetism or ferrimagnetism to paramagnetism).

[0147] In this application, the first temperature-sensing magnet 103 can sense the temperature inside the battery cell 100. When the temperature inside the battery cell 100 is equal to or higher than the Curie temperature of the first temperature-sensing magnet 103, the magnetism of the first temperature-sensing magnet 103 disappears, and the Curie temperature of the first temperature-sensing magnet 103 matches the thermal runaway critical temperature of the battery cell 100.

[0148] Below, in conjunction with Figure 6 This article details the relationship between the magnetic transformation of a thermosensitive magnet and its Curie temperature.

[0149] Please see Figure 6 , Figure 6 This diagram illustrates the relationship between the magnetism and temperature of a temperature-sensitive magnet according to an embodiment of this application. Figure 6 In the diagram, each irregular shape represents a magnetic domain in the thermosensitive magnet, and the direction of the arrow in each irregular shape represents the orientation of the magnetic moment of the magnetic domain.

[0150] like Figure 6 As shown, near the Curie temperature Tc, the magnetism of the temperature-sensitive magnet changes with increasing temperature. The material of the temperature-sensitive magnet mentioned in this application is not limited. Generally, temperature-sensitive magnets with characteristic chemical compositions, crystal structures, types of doped elements, and doping concentrations can be selected to achieve different Curie temperatures, thus realizing the over-temperature warning function of cell 100.

[0151] For example, the temperature-sensing magnet can be a neodymium magnet (NdFeB) or a samarium cobalt (SmCo) magnet. Alternatively, a ferrite permanent magnet probe (Curie temperature Tc = 65℃) can also be used.

[0152] When the ambient temperature T1 of the temperature-sensing magnet is lower than the Curie temperature Tc of the magnet, the magnetic moments of the domains in the magnet are arranged in a neat and orderly manner, and the orientation of the magnetic moments of the domains is parallel. Figure 6 The arrows in all the irregular shapes shown are parallel, which can produce spontaneous magnetization. Therefore, thermosensitive magnets have strong permanent magnetism (such as ferromagnetism or subferrimagnetism).

[0153] As the ambient temperature of the thermosensitive magnet continues to rise, when the ambient temperature T1 exceeds the Curie temperature Tc of the thermosensitive magnet, the magnetic domains within the magnet undergo drastic thermal changes, resulting in a chaotic and disordered arrangement of magnetic moments, and the orientation of the magnetic moments within the domains becomes random. Figure 6 The arrows in all the irregular shapes shown are randomly oriented and can cancel each other out. Therefore, the thermosensitive magnet becomes paramagnetic, and its magnetism weakens rapidly until it disappears (i.e., the magnetism changes from strong to weak or from present to absent).

[0154] Therefore, the selection specification of the Curie temperature of the first temperature-sensing magnet 103 can be based on the internal temperature of the cell 100 when a thermal anomaly occurs (i.e., the critical temperature T of thermal runaway of the cell 100). NR The selection is made such that the Curie temperature of the first temperature-sensing magnet 103 is close to the thermal runaway critical temperature T of the battery cell 100. NR This can be understood as matching the Curie temperature of the first temperature-sensing magnet 103 with the thermal runaway critical temperature T of the battery cell 100. NR The difference between the values ​​within the first preset range can be considered as the Curie temperature and the critical thermal runaway temperature T of the battery cell at 100°C. NR Matching.

[0155] This application does not limit the specific values ​​of the first preset range.

[0156] For example, the critical temperature T for thermal runaway of cell 100 NR If the temperature is 100°C, then the first temperature-sensing magnet 103 can be selected from magnets with a Curie temperature within a certain range, such as magnets with a Curie temperature greater than 80°C and less than 120°C.

[0157] Furthermore, the Curie temperature of the first temperature-sensing magnet 103 is positively correlated with the internal temperature of the battery cell 100. Therefore, temperature changes in the battery cell 100 can trigger a magnetic change in the first temperature-sensing magnet 103, enabling the magnetic change in the first temperature-sensing magnet 103 to accurately reflect the internal temperature of the battery cell 100 when a thermal anomaly occurs.

[0158] Furthermore, this application does not limit the specific value of the Curie temperature of the first thermal magnet 103. For example, the Curie temperature of the first thermal magnet 103 may range from 60°C to 300°C.

[0159] This application does not specify the exact location of the first temperature-sensing magnet 103.

[0160] Please see Figures 7-8 , Figures 7-8 A schematic diagram of the structure of a battery cell provided in one embodiment of this application is shown.

[0161] like Figure 7 As shown, the first temperature-sensing magnet 103 is placed inside the receiving cavity. The first temperature-sensing magnet 103 can be fixed to the inner surface of the battery cell housing 102. Figure 7 (This method is used for illustration).

[0162] Thus, the first temperature-sensing magnet 103 is closer to the battery cell 100, which allows the first temperature-sensing magnet 103 to detect the internal temperature of the battery cell 100 more accurately. It also allows the battery cell housing 102 to separate the first temperature-sensing magnet 103 and the first dry reed switch 104, making full use of the internal space of the battery cell 100 without damaging the complete structure of the battery cell housing 102.

[0163] like Figure 8 As shown, the first temperature-sensing magnet 103 is placed outside the receiving cavity. The first temperature-sensing magnet 103 can be fixed to the outer surface of the cell housing 102. Figure 8 (This method is illustrated in the diagram). Alternatively, the first temperature-sensing magnet 103 can be fixed to the outside of the cell housing 102, that is, the first temperature-sensing magnet 103 can be in no contact with the surface of the cell housing 102, which facilitates the separation of the first temperature-sensing magnet 103 and the cell housing 102.

[0164] When the first temperature-sensing magnet 103 is fixed to the outside of the cell housing 102, its proximity to the cell housing 102 ensures that it can penetrate the cell 100 and sense the heat generated there, allowing its magnetism to reflect temperature changes. The distance between the first temperature-sensing magnet 103 and the cell housing 102 is set within a small range; this application does not limit its specific value.

[0165] When the first temperature-sensing magnet 103 is fixed to the outside of the cell housing 102, the cell 100 may further include a heat-conducting element. The heat-conducting element may be made of materials such as thermally conductive adhesive or thermally conductive silicone grease, and this application does not limit its application to this. Furthermore, the heat-conducting element helps the first temperature-sensing magnet 103 accurately reflect the temperature changes of the cell 100.

[0166] Therefore, the first temperature-sensing magnet 103 can be flexibly set up, taking into full account the limited internal space of the battery cell 100, and also realizes the separate setting of the first temperature-sensing magnet 103 and the first dry reed switch 104 without damaging the complete structure of the battery cell housing 102.

[0167] The first temperature-sensing magnet 103 can be fixed in the battery cell 100 by means of welding, embedding, or gluing, which can ensure that the first temperature-sensing magnet 103 will not move when the battery cell 100 shakes. Alternatively, the first temperature-sensing magnet 103 can be fixed by means of the battery cell 100 / battery management system 20.

[0168] In summary, based on the Curie temperature of the first temperature-sensing magnet 103 and the thermal runaway critical temperature T of the battery cell 100... NR The matching between them means that temperature changes in the battery cell 100 can trigger a magnetic change in the first temperature-sensing magnet 103. In other words, the temperature inside the battery cell 100 does not exceed the thermal runaway critical temperature T of the battery cell 100. NR At that time, no thermal anomaly occurred in cell 100, and the first temperature-sensing magnet 103 exhibited strong magnetism. The temperature inside cell 100 did not exceed the thermal runaway critical temperature T of cell 100. NR When the cell 100 experiences a thermal anomaly, the magnetism of the first temperature-sensing magnet 103 may gradually weaken until it disappears.

[0169] In addition, this application can set a first preset temperature, which is related to the Curie temperature of the first temperature-sensing magnet 103 and can be used as the temperature at which the magnetism of the first temperature-sensing magnet 103 changes, so as to promptly identify thermal anomalies in the battery cell 100.

[0170] This application does not limit the specific value of the first preset temperature. In some embodiments, the first preset temperature may be equal to the Curie temperature of the first temperature-sensing magnet 103, which is beneficial for accurately detecting the internal temperature of the battery cell 100 when a thermal anomaly occurs. Alternatively, the first preset temperature may be higher than the Curie temperature of the first temperature-sensing magnet 103, taking into full account the battery cell 100's certain tolerance capacity and the temperature deviation of related components due to the manufacturing process.

[0171] 4. First dry reed pipe 104

[0172] A dry reed switch, also known as a reed switch or magnetron, is a passive circuit switching device that utilizes a magnetic field. It has advantages such as simple structure, small size, and ease of control.

[0173] In this application, the first dry reed switch 104 can be disposed outside the receiving cavity. Thus, the first dry reed switch 104 and the first temperature-sensing magnet 103 are separated without damaging the complete structure of the battery cell housing 102.

[0174] In some embodiments, such as Figure 7 As shown, the first dry reed switch 104 can be fixed to the outer surface of the cell housing 102. Alternatively, as... Figure 8As shown, the first dry reed switch 104 can be fixed to the outside of the cell housing 102, that is, the first dry reed switch 104 can be in no contact with the surface of the cell housing 102.

[0175] It should be noted that when the first dry reed switch 104 and the first temperature-sensing magnet 103 are both fixed on the outside of the cell housing 102, the first dry reed switch 104 and the first temperature-sensing magnet 103 can also be integrated without damaging the complete structure of the cell housing 102.

[0176] The first dry reed switch 104 can be fixed in the battery cell 100 by means of bracket, welding, embedding or gluing, which can ensure that the first dry reed switch 104 will not move when the battery cell 100 shakes. In addition, the first dry reed switch 104 can be fixed by means of the battery cell housing 102 / battery management system 20.

[0177] The first dry reed switch 104 can cooperate with the first temperature-sensing magnet 103. The space where the first dry reed switch 104 is located can be placed in the magnetic field generated by the first temperature-sensing magnet 103, so that the first dry reed switch 104 can detect the magnetism of the first temperature-sensing magnet 103. After the magnetism of the first temperature-sensing magnet 103 gradually weakens and eventually disappears, the magnetic induction intensity of the first temperature-sensing magnet 103 will irreversibly decrease and eventually disappear, and the magnetic field in the space where the first dry reed switch 104 is located will decrease and eventually disappear. Therefore, after the magnetism of the first temperature-sensing magnet 103 disappears, the conduction state of the first dry reed switch 104 will change.

[0178] The first dry reed switch 104 is also connected to a sampling channel of the detection module 201 ( Figure 3 (Illustrated using sampling channel x) Electrical connection. The sampling channel x of the detection module 201 may include one or more terminals. Based on the aforementioned electrical connection, the detection module 201 can detect in real time whether the conduction state of the first dry reed switch 104 has changed.

[0179] Therefore, after detecting a change in the conduction state of the first dry reed switch 104, the detection module 201 can send the detection result to the host unit 202. After receiving the detection result, the host unit 202 can determine that the battery cell 100 is overheating abnormally.

[0180] The first dry reed 104 may include three types: normally open dry reed, normally closed dry reed, and switching dry reed.

[0181] Below, in conjunction with Figure 9 , Figure 10 , Figure 11 ,and Figures 12A-12B This article details the working principles of three types of dry reed pipes.

[0182] For ease of explanation, in each figure, the first temperature-sensing magnet 103 is fixed on the inner surface of the battery cell 100, and the first dry reed switch 104 is fixed on the outer surface of the battery cell 100. The first temperature-sensing magnet 103 includes two magnetic poles, a south pole (S) and a north pole (N). The dashed lines represent the magnetic field lines generated by the corresponding temperature-sensing magnets for illustrative purposes.

[0183] Please see Figures 9-10 , Figure 9 The diagram shows a partial structural schematic of a battery according to an embodiment of this application, wherein the first dry reed switch 104 includes a first end P1 and a second end P2. Figure 10 This illustration shows a schematic diagram of the working principle of a normally open dry reed switch according to an embodiment of this application.

[0184] like Figures 9-10 As shown, the first dry reed 104 is a normally open dry reed, namely a type A dry reed.

[0185] The normally open dry reed switch includes two terminals, namely the first terminal P1a and the second terminal P2a.

[0186] When a magnetic field exists in the space where the normally open dry reed switch is located, the reed inside the normally open dry reed switch closes, and the first end P1a and the second end P2a of the normally open dry reed switch are connected. At this time, the conduction state of the normally open dry reed switch is a low-impedance conduction state.

[0187] When the magnetic field in the space where the normally open dry reed switch is located disappears (i.e., there is no magnetic field), the reed inside the normally open dry reed switch breaks, and the first end P1a and the second end P2a of the normally open dry reed switch are disconnected. At this time, the conduction state of the normally open dry reed switch is a high-impedance non-conducting state.

[0188] The number of the first dry reed 104 can be one or more normally open dry reeds.

[0189] When the number of the first dry reed switch 104 is one normally open dry reed switch, the two ends (first end P1a and second end P2a) of the normally open dry reed switch are connected in series with the sampling channel x of the detection module 201. When the number of the first dry reed switch 104 is multiple normally open dry reed switches, the multiple normally open dry reed switches are connected in series with the sampling channel x of the detection module 201 at both ends (first end P1a and second end P2a).

[0190] The sampling channel x of the detection module 201 may include a first terminal a1 and a second terminal a2 of the detection module 201. The first terminal P1a is electrically connected to the first terminal a1 of the detection module 201, and the second terminal P2a is electrically connected to the second terminal a2 of the detection module 201.

[0191] In summary, when the first dry reed switch 104 is a normally open dry reed switch, as the magnetism of the first temperature-sensing magnet 103 disappears, the conduction state of the first dry reed switch 104 can change from a low-impedance conduction state to a high-impedance non-conducting state.

[0192] Therefore, after detecting that the conduction state of the first dry reed switch 104 changes from a low-impedance conducting state to a high-impedance non-conducting state, the detection module 201 can send the detection result to the host unit 202. After receiving the detection result, the host unit 202 can determine that the battery cell 100 has experienced a thermal abnormality.

[0193] It should be noted that under normal operating conditions, the normally open dry reed switch and the battery management system 200 are connected, meaning the circuit formed by them is conductive. Therefore, the normally open dry reed switch has a self-test function, which can rule out the possibility that the conduction state of the normally open dry reed switch cannot be changed due to poor connection or disconnection of the normally open dry reed switch itself. Under abnormal thermal conditions, the conduction state of the normally open dry reed switch can change, allowing the battery management system 200 to determine that the cell 100 has experienced a thermal anomaly.

[0194] Please see Figure 11 , Figure 11 This illustration shows a schematic diagram of the working principle of a normally closed dry reed switch according to an embodiment of this application.

[0195] like Figure 9 and Figure 11 As shown, the first dry reed 104 is a normally closed dry reed, namely a type B dry reed.

[0196] The normally closed dry reed switch includes two terminals, namely the first terminal P1b and the second terminal P2b.

[0197] When a magnetic field exists in the space containing a normally closed dry reed switch, the reed inside the normally closed dry reed switch breaks, and the first end P1b and the second end P2b of the normally closed dry reed switch disconnect. At this time, the conducting state of the normally closed dry reed switch is a high-impedance non-conducting state.

[0198] When the magnetic field in the space where the normally closed dry reed switch is located disappears (i.e., there is no magnetic field), the reed inside the normally closed dry reed switch closes, and the first end P1b and the second end P2b of the normally closed dry reed switch are connected. At this time, the conduction state of the normally closed dry reed switch is a low-impedance conduction state.

[0199] The number of the first dry reed 104 can be one or more normally closed dry reeds.

[0200] When the number of the first dry reed switch 104 is one normally closed dry reed switch, the two ends (first end P1b and second end P2b) of the normally open dry reed switch are electrically connected in parallel with the sampling channel x of the detection module 201. When the number of the first dry reed switch 104 is multiple normally closed dry reed switches, each normally closed dry reed switch is electrically connected in parallel, and the two ends (first end P1b and second end P2b) of each normally closed dry reed switch are electrically connected in parallel with the sampling channel x of the detection module 201.

[0201] The sampling channel x of the detection module 201 may include a first terminal a1 and a second terminal a2 of the detection module 201. The first terminal P1b and the second terminal P2b are respectively connected in parallel to the first terminal a1 and the second terminal a2 of the detection module 201.

[0202] In summary, when the first dry reed switch 104 is a normally closed dry reed switch, as the magnetism of the first temperature-sensing magnet 103 disappears, the conduction state of the first dry reed switch 104 can change from a high-impedance non-conducting state to a low-impedance conducting state.

[0203] Therefore, after detecting that the conduction state of the first dry reed switch 104 changes from a high-impedance non-conducting state to a low-impedance conducting state, the detection module 201 can send the detection result to the host unit 202. After receiving the detection result, the host unit 202 can determine that the battery cell 100 has experienced a thermal abnormality.

[0204] It should be noted that under normal operating conditions, the normally closed dry reed switch and the battery management system 200 are disconnected, meaning the circuit formed by them is not conductive. Therefore, the normally closed dry reed switch does not consume standby power to the battery management system 200, and it is easy to network, convenient to wire, and has stronger sensitivity and reliability. Under abnormal thermal conditions, the conduction state of the normally closed dry reed switch can change, allowing the battery management system 200 to determine that the battery cell 100 has experienced a thermal anomaly.

[0205] Please see Figures 12A-12B , Figure 12A This illustration shows a partial structural diagram of a battery according to an embodiment of this application. Figure 12B This illustration shows a schematic diagram of the working principle of a switching dry reed switch according to an embodiment of this application.

[0206] like Figures 12A-12B As shown, the first dry reed 104 is a switchable dry reed, namely a C-type dry reed.

[0207] The switching dry reed switch includes three terminals: a first terminal Q2, a second terminal Q1, and a third terminal Q3. The first terminal Q2 and the second terminal Q1 can form a first channel, and the first terminal Q2 and the third terminal Q3 can form a second channel.

[0208] When a magnetic field exists in the space where the switching dry reed switch is located, the first end Q2 and the second end Q1 of the switching dry reed switch are connected, while the first end Q2 and the third end Q3 of the switching dry reed switch are disconnected. At this time, the conduction state of the first channel is a low-impedance conduction state, and the conduction state of the second channel is a high-impedance non-conducting state.

[0209] When the magnetic field in the space where the switching dry reed switch is located disappears (i.e., there is no magnetic field), the reed inside the switching dry reed switch switches the corresponding connection terminals. That is, the first terminal Q2 and the second terminal Q1 of the switching dry reed switch are disconnected, and the first terminal Q2 and the third terminal Q3 of the switching dry reed switch are connected. At this time, the conduction state of the first channel is a high impedance non-conducting state, and the conduction state of the second channel is a low impedance conducting state.

[0210] The number of first dry reeds 104 can be one or more switchable dry reeds.

[0211] When the number of the first dry reed switches 104 is one switching dry reed switch, the first channel (first end Q2 and second end Q1) of the switching dry reed switch is connected in series with the sampling channel x of the detection module 201. The second channel (first end Q2 and third end Q3) of the switching dry reed switch is connected in parallel with the sampling channel x of the detection module 201.

[0212] When the number of the first dry reed 104 is multiple switching dry reeds, the first channels of the multiple switching dry reeds are connected in series, and the multiple switching dry reeds connected in series are connected in series with the sampling channel x of the detection module 201 at both ends (first end Q2 and second end Q1).

[0213] Furthermore, the second channel of each switching dry reed is electrically connected in parallel, and both ends (first end Q2 and third end Q3) of the second channel of each switching dry reed are electrically connected in parallel to the sampling channel x of the detection module 201.

[0214] The sampling channel x of the detection module 201 may include a first terminal a1, a second terminal a2, and a third terminal a3. In the first channel, the first terminal Q2 is electrically connected to the first terminal a1 of the detection module 201, and the second terminal Q1 is electrically connected to the second terminal a2 of the detection module 201. In the second channel, the first terminal Q2 is electrically connected to the first terminal a1 of the detection module 201, and the third terminal Q3 is electrically connected to the third terminal a3 of the detection module 201.

[0215] In summary, when the first dry reed switch 104 is a switching type dry reed switch, as the magnetism of the first temperature-sensing magnet 103 disappears, the conduction state of the first channel can change from a low-impedance conduction state to a high-impedance non-conducting state, and the conduction state of the second channel can change from a high-impedance non-conducting state to a low-impedance conduction state.

[0216] Therefore, after detecting that the conduction state of the first channel changes from a low-impedance conduction state to a high-impedance non-conducting state, and the conduction state of the second channel changes from a high-impedance non-conducting state to a low-impedance conduction state, the detection module 201 can send the detection result to the host unit 202. After receiving the detection result, the host unit 202 can determine that the cell 100 has experienced a thermal abnormality.

[0217] It should be noted that under normal operating conditions, the first channel of the switching dry reed switch is connected to the battery management system 200. Therefore, the switching dry reed switch has a self-test function, eliminating the possibility that its conduction state cannot be changed due to faulty or disconnected connections. When the cell 100 is under abnormal thermal conditions, the conduction state of the switching dry reed switch can change, allowing the battery management system 200 to determine if a thermal abnormality has occurred in the cell 100.

[0218] 5. Detection module 201 and host unit 202

[0219] The detection module 201 is electrically connected to the first dry reed switch 104, and the aforementioned electrical connection relationship can be found in the previous description. Based on the aforementioned electrical connection relationship, the detection module 201 can detect in real time whether the conduction state of the first dry reed switch 104 has changed. The specific implementation method of the aforementioned process can be found in the previous description, and will not be repeated here.

[0220] The detection module 201 is also electrically connected to the host unit 202. The detection module 201 and the host unit 202 can communicate digital signals based on protocols such as Controller Area Network (CAN). Alternatively, the detection module 201 and the host unit 202 can also communicate analog signals, such as detecting current, resistance, or voltage, using methods such as an ohmmeter, a bridge voltage divider, or a pull-up resistor voltage divider.

[0221] This application does not limit the specific implementation of the detection module 201 and the host unit 202. In some embodiments, the detection module 201 may be integrated into the host unit 202. Alternatively, the detection module 201 and the host unit 202 may be separated.

[0222] In addition, the detection module 201 can reuse the existing insulation detection module in battery 1, or it can be a newly added insulation detection module in battery 1. In addition to detecting whether the conduction state of the first dry reed switch 104 has changed, the insulation detection module can also detect whether there is a grounding fault in battery 1 when battery 1 is powered on, so as to ensure that battery 1 can operate safely.

[0223] Alternatively, the detection module 201 can reuse an existing temperature sampling module (such as an NTC) in the battery 1, or it can be a newly added temperature sampling module in the battery 1. In addition to detecting whether the conduction state of the first dry reed switch 104 has changed, the temperature sampling module can also detect the temperature of the battery 1 in real time to ensure that the battery 1 can operate safely.

[0224] Alternatively, the detection module 201 may employ the aforementioned insulation detection module and temperature sampling module.

[0225] Based on the aforementioned electrical connection, after detecting a change in the conduction state of the first dry reed switch 104, the detection module 201 can send the detection result to the host unit 202. If no change in the conduction state of the first dry reed switch 104 is detected, the detection module 201 can continue to detect whether the conduction state of the first dry reed switch 104 has changed.

[0226] This application does not specify the specific method for achieving the detection results.

[0227] When the detection result is a digital signal "0 / 1", the detection module 201 and the host unit 202 can pre-agree whether the level of the detection result changes to indicate whether the cell 100 has a thermal abnormality. Specifically, if the level of the detection result changes, it indicates that the cell 100 has a thermal abnormality; if the level of the detection result does not change, it indicates that the cell 100 has not a thermal abnormality.

[0228] Therefore, after detecting a change in the conduction state of the first dry reed switch 104, the detection module 201 can send a level transition detection result to the host unit 202. After detecting the level transition in the detection result, the host unit 202 can determine that the battery cell 100 has experienced a thermal abnormality.

[0229] Alternatively, when the detection result is a digital signal "0 / 1", the detection module 201 and the host unit 202 can pre-negotiate whether the detection result is sent to indicate whether the battery cell 100 has experienced a thermal abnormality. Specifically, if the detection result is sent, it indicates that the battery cell 100 has experienced a thermal abnormality; if the detection result is not sent, it indicates that the battery cell 100 has not experienced a thermal abnormality.

[0230] Therefore, after detecting a change in the conduction state of the first dry reed switch 104, the detection module 201 can send the detection result to the host unit 202. After receiving the detection result, the host unit 202 can determine that the battery cell 100 has experienced a thermal abnormality.

[0231] The level transition of the detection result can be understood as a transition from a high level "1" to a low level "0", or a transition from a low level "0" to a high level "1".

[0232] When the detection result is an analog signal, the detection module 201 and the host unit 202 can agree in advance that the amplitude change of the voltage in the detection result is less than or equal to the threshold voltage V. g If the amplitude of the voltage change is greater than the threshold voltage V, it indicates that cell 100 has experienced a thermal anomaly. g The amplitude indicates that cell 100 has not experienced any thermal abnormalities.

[0233] Among them, the threshold voltage V g This refers to the voltage at which the battery cell 100 changes from a state of no thermal abnormality to one of thermal abnormality, used to determine whether the magnetism of the first temperature-sensing magnet 103 has disappeared. Correspondingly, the threshold voltage V... g It is determined based on the Curie temperature of the first temperature-sensing magnet 103, the sensing sensitivity of the first dry reed switch 104, and the response sensitivity of the detection module 201 and the host unit 202.

[0234] Therefore, after detecting a change in the conduction state of the first dry reed switch 104, the detection module 201 can send a voltage with an amplitude less than or equal to the threshold voltage V to the host unit 202. g The detection result. The host unit 202 detects that the voltage amplitude of the detected result has decreased to less than or equal to the threshold voltage V. g When the amplitude reaches a certain value, it can be determined that cell 100 has experienced a thermal anomaly.

[0235] Below, in conjunction with Figures 13-14 This section details the specific architecture of the detection module 201.

[0236] Please see Figure 13 , Figure 13 A schematic diagram of the architecture of a detection module according to an embodiment of this application is shown. For ease of explanation, Figure 13 In the middle, the first dry reed tube 104 adopts Figure 10 The normally open dry reed switch shown is illustrated as an example.

[0237] like Figure 13As shown, the detection module 201 may include an ohmmeter. The first and second ends of the ohmmeter can be regarded as the sampling channel x of the detection module 201, that is, the first end of the ohmmeter is the first end a1 of the detection module 201, and the second end of the ohmmeter is the second end a2 of the detection module 201.

[0238] The first end of the ohmmeter is electrically connected to the first end P1a of the first dry reed switch 104, the second end of the ohmmeter is electrically connected to the second end P2a of the first dry reed switch 104, and the fourth end a4 of the detection module 201 is electrically connected to the host unit 202.

[0239] After a thermal anomaly occurs in the battery cell 100, the magnetism of the first temperature-sensing magnet 103 disappears, the reed inside the first dry reed switch 104 breaks, and the first end P1a and the second end P2a of the first dry reed switch 104 disconnect. At this time, the ohmmeter will detect a high impedance exceeding a preset resistance value, and the detection module 201 can then send the detection result to the host unit 202. After receiving the detection result, the host unit 202 can determine that a thermal anomaly has occurred in the battery cell 100. Therefore, the host unit 202 can take appropriate battery over-temperature management strategies.

[0240] Please see Figure 14 , Figure 14 A schematic diagram of the architecture of a detection module according to an embodiment of this application is shown. For ease of explanation, Figure 14 In the middle, the first dry reed tube 104 adopts Figure 11 The normally closed dry reed switch is shown as an example.

[0241] like Figure 14 As shown, the detection module 201 may include: a low-voltage power supply V1, resistors R1, R2, R3, and R4. The first terminals of resistors R1 and V1 can be considered as the sampling channel x of the detection module 201; that is, the first terminal of resistor R1 is terminal a1 of the detection module 201, and the first terminal of V1 is terminal a2 of the detection module 201. Furthermore, the second terminal of resistor R3 is terminal a5 of the detection module 201, and the second terminal of resistor R4 is terminal a6 of the detection module 201.

[0242] Specifically, the first end P1b and the second end P2b of the first dry reed switch 104 are connected in parallel to the first end of resistor R1 and the first end of low-voltage power supply V1, respectively. The second end of resistor R1 is connected to the first end of resistor R2 and the first end of resistor R3, respectively. The second end of low-voltage power supply V1 is connected to the second end of resistor R2 and the first end of resistor R4, respectively. The second end of resistor R3 is connected to the first end of host unit 202, and the second end of resistor R4 is connected to the second end of host unit 202.

[0243] The resistance ratio between resistors R1 and R2 can be set according to the output voltage of the low-voltage power supply V1 and the voltage detection range of the host unit 202, so that the voltage across resistor R2 can meet the connection requirements of the host unit 202. Resistors R3 and R4 have equal resistance values.

[0244] After a thermal anomaly occurs in the battery cell 100, the magnetism of the first temperature-sensing magnet 103 disappears, the reed inside the first dry reed switch 104 closes, and the first end P1b and the second end P2b of the first dry reed switch 104 become conductive. At this time, a voltage difference can be generated between the fifth end a5 and the sixth end a6 of the detection module 201, which is the detection result. After detecting the aforementioned detection result, the host unit 202 can determine that a thermal anomaly has occurred in the battery cell 100. Therefore, the host unit 202 can take corresponding battery over-temperature management strategies for the battery cell 100.

[0245] It should be noted that the detection module 201 of this application includes, but is not limited to, […]. Figure 13 and Figure 14 The implementation method shown.

[0246] In summary, when a thermal anomaly occurs in the battery cell 100, the magnetism of the first temperature-sensing magnet 103 disappears, causing a change in the conduction state of the first dry reed switch 104. Therefore, the battery management system 20 can determine that a thermal anomaly has occurred in the battery cell 100 after detecting the change in the conduction state of the first dry reed switch 104.

[0247] The battery cell, battery module containing the battery cell, battery containing the battery module, and setup and device containing the battery provided in this application, through a wireless magnetic induction detection response method, based on the cooperation of a first temperature-sensing magnet and a first dry reed switch, can accurately detect the internal temperature of the battery cell when a thermal anomaly occurs. This allows for accurate and timely early warning of thermal anomalies, solving the problem of delayed or inaccurate early warning responses and improving the response speed, thus enhancing battery safety. Simultaneously, the layout of the first temperature-sensing magnet and the first dry reed switch does not require damaging the integrity of the battery cell casing, avoiding problems such as encapsulation leakage, which helps extend battery life, ensures battery reliability and safety, and facilitates large-scale mass production and use.

[0248] In addition, this application may also record whether the first temperature-sensing magnet has undergone a magnetic change, and / or whether the conduction state of the first dry reed switch has changed. The aforementioned situations can serve as the basis for identifying whether the battery cell has overheated abnormally, thus avoiding the safety risks caused by the battery cell overheating abnormally.

[0249] Based on the description of the above embodiments, for the same battery cell 100, multiple sets of paired temperature-sensing magnets and dry reed switches can be arranged, such as two sets, three sets, four sets, etc. The Curie temperature of the temperature-sensing magnets in each set is different, and the dry reed switches in each set are electrically connected to the battery management system 20 through different sampling channels, so that the battery management system 20 can detect the internal temperature of the same battery cell 100 when different degrees of thermal anomaly occur, and realize the over-temperature warning function of the battery cell 100 at different levels.

[0250] The following is a detailed description of battery 1 corresponding to the above content. For ease of explanation, this application uses two sets of paired temperature-sensing magnets and a dry reed switch as examples.

[0251] Please see Figure 15 , Figure 15 A partial structural schematic diagram of a battery provided in one embodiment of this application is shown.

[0252] like Figure 15 As shown, for the same cell 100, the cell 100 of this application is in Figure 4 Based on the architecture shown, it may further include: a second temperature-sensing magnet 105 and a second dry reed switch 106.

[0253] Please see Figure 16 , Figure 16 This diagram illustrates a flowchart of a battery thermal anomaly early warning method according to an embodiment of this application. Based on Figure 15 Battery 1 shown, as Figure 16 As shown, the battery thermal anomaly early warning method of this application may include:

[0254] S201, The first temperature-sensing magnet senses the temperature inside the battery cell; wherein, if the temperature inside the battery cell is equal to or higher than the Curie temperature of the first temperature-sensing magnet, the magnetism of the first temperature-sensing magnet disappears, and the Curie temperature of the first temperature-sensing magnet matches the thermal runaway critical temperature of the battery cell.

[0255] S202. After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed switch changes.

[0256] S203. After detecting a change in the conduction state of the first dry reed switch, the battery management system determines that the cell has experienced a first-degree thermal anomaly. For example, the battery management system can execute a first-level safety warning, such as notifying relevant personnel.

[0257] S204. The second temperature-sensing magnet senses the temperature inside the battery cell; wherein, if the temperature inside the battery cell is equal to or higher than the Curie temperature of the second temperature-sensing magnet, the magnetism of the second temperature-sensing magnet disappears, and the Curie temperature of the second temperature-sensing magnet matches the thermal runaway critical temperature of the battery cell.

[0258] S205. After the magnetism of the second temperature-sensing magnet disappears, the conduction state of the second dry reed switch changes.

[0259] S206. After detecting a change in the conduction state of the second dry reed switch, the battery management system determines that the cell has experienced a second-degree thermal anomaly, which differs from the first degree. For example, the battery management system can execute a second-degree safety warning, such as stopping the cell's operation.

[0260] The second temperature-sensing magnet 105 can be placed inside the receiving cavity, or it can be placed outside the receiving cavity. This application does not limit the specific location of the second temperature-sensing magnet 105; its specific implementation can be found in [reference needed]. Figures 7-8 The specific location of the first temperature-sensing magnet 103 shown is not described here.

[0261] This ensures that the magnetic field lines generated by the second temperature-sensing magnet 105 can pass through the battery cell housing 102, so that the space where the second dry reed switch 106 is located can be placed in a magnetic field.

[0262] The Curie temperature of the second temperature-sensing magnet 105 is different from that of the first temperature-sensing magnet 103, so that the first temperature-sensing magnet 103 and the second temperature-sensing magnet 105 can detect the internal temperature of the battery cell 100 when different degrees of thermal anomaly occur. This is beneficial to reflect the degree of thermal anomaly of the battery cell 100 and realize multi-level early warning of different degrees of thermal anomaly of the battery cell 100.

[0263] based on Figure 6 According to the description of the embodiment, the Curie temperature specification of the second temperature-sensing magnet 105 can be selected based on the internal temperature of the cell 100 when a thermal anomaly occurs (i.e., the thermal runaway critical temperature T of the cell 100). NR The selection is made such that the Curie temperature of the second temperature-sensing magnet 105 is close to the thermal runaway critical temperature T of the battery cell 100. NR This can be understood as matching the Curie temperature with the thermal runaway critical temperature T of the battery cell at 100°C. NR The difference between the two values ​​within the second preset range can be considered as the Curie temperature and the critical thermal runaway temperature T of the battery cell at 100°C. NR Matching.

[0264] This application does not limit the specific value of the second preset range. The second preset range is different from the first preset range. The second preset range can be flexibly set according to the size of the first preset range.

[0265] Furthermore, the Curie temperature of the second temperature-sensing magnet 105 is positively correlated with the internal temperature of the battery cell 100. Therefore, temperature changes in the battery cell 100 can trigger a magnetic change in the second temperature-sensing magnet 105, enabling the magnetic change in the second temperature-sensing magnet 105 to accurately reflect the internal temperature of the battery cell 100 when a thermal anomaly occurs.

[0266] Therefore, based on the Curie temperature of the second temperature-sensing magnet 105 and the thermal runaway critical temperature T of the battery cell 100, NR The matching between the two allows temperature changes in the battery cell 100 to trigger a magnetic change in the second temperature-sensing magnet 105. In other words, when the battery cell 100 is not experiencing a thermal anomaly, the second temperature-sensing magnet 105 exhibits strong magnetism. When a thermal anomaly occurs in the battery cell 100, the magnetism of the second temperature-sensing magnet 105 gradually weakens until it disappears.

[0267] Considering that the Curie temperature of the first temperature-sensing magnet 103 may be set relatively close to the thermal runaway critical temperature T of the battery cell 100 NR Therefore, it is possible that cell 100 has actually experienced a thermal anomaly, but the battery management system 20 has not issued a warning.

[0268] Based on the above, this application can set the Curie temperature of the second temperature-sensing magnet 105 to be lower than the Curie temperature of the first temperature-sensing magnet 103, and the Curie temperature of the first temperature-sensing magnet 103 to be lower than the thermal runaway critical temperature T of the battery cell 100. NR The critical temperature for thermal runaway of cell 100 is T. NR It exceeds the maximum temperature of the battery cell during normal operation (100).

[0269] As the temperature inside the battery cell 100 increases, the magnetism of the second temperature-sensing magnet 105 changes first. As the temperature inside the battery cell 100 continues to rise, the magnetism of the first temperature-sensing magnet 103 changes again. It should be noted that the magnetism of the second temperature-sensing magnet 105 will not change at this point.

[0270] Therefore, by setting the second temperature-sensing magnet 105, the thermal abnormality of the battery cell 100 can be quickly detected, avoiding the problem of insufficient early warning due to the Curie temperature setting of a single temperature-sensing magnet being too high.

[0271] It should be noted that, Figure 16 In the process, the execution order of each step is: S204-S205-S206-S201-S202-S203.

[0272] Considering that the Curie temperature of the first temperature-sensing magnet 103 may also be set lower than the thermal runaway critical temperature T of the battery cell 100 NR If the size is much smaller, then it is possible that cell 100 has not actually experienced a thermal anomaly, but the battery management system 20 has already issued a warning.

[0273] Based on the above, this application can set the Curie temperature of the second temperature-sensing magnet 105 to be greater than the Curie temperature of the first temperature-sensing magnet 103, and the Curie temperature of the second temperature-sensing magnet 105 to be less than the thermal runaway critical temperature T of the battery cell 100. NRThe critical temperature for thermal runaway of cell 100 is T. NR It exceeds the maximum temperature of the battery cell during normal operation (100).

[0274] As the temperature inside the battery cell 100 rises, the magnetism of the first temperature-sensing magnet 103 changes first. As the temperature inside the battery cell 100 continues to rise, the magnetism of the second temperature-sensing magnet 105 changes again. It should be noted that the magnetism of the first temperature-sensing magnet 103 will not change again at this point.

[0275] Therefore, by setting the second temperature-sensing magnet 105, the thermal anomaly of the battery cell 100 can be accurately detected, avoiding the problem of too frequent warnings caused by the Curie temperature setting of a single temperature-sensing magnet being too low.

[0276] It should be noted that, Figure 16 In this process, the execution order of each step is: S201-S202-S203-S204-S205-S206. For ease of explanation, this application uses the aforementioned order as an example.

[0277] The second dry reed switch 106 can be placed outside the receiving cavity. This application does not limit the specific location of the second dry reed switch 106; its specific implementation can be found in [reference needed]. Figures 7-8 The specific location of the first dry reed switch 104 shown is not described here.

[0278] In addition, the first dry reed 104 and the second dry reed 106 may be of the same type of dry reed or of different types; this application does not limit this.

[0279] This application does not limit the specific type, quantity, or working principle of the second dry reed switch 106; its specific implementation can be found in [reference needed]. Figures 9-12B The description of the first dry reed switch 104 shown is omitted here.

[0280] It should be noted that the conduction state of the second dry reed switch 106 is unrelated to the magnetic change of the first temperature-sensing magnet 103, and the conduction state of the first dry reed switch 104 is unrelated to the magnetic change of the second temperature-sensing magnet 105.

[0281] In other words, the first temperature-sensing magnet 103 and the first dry reed switch 104 form a magnetic shield with the second temperature-sensing magnet 105 and the second dry reed switch 106. The magnetic change of the second temperature-sensing magnet 105 cannot cause a change in the conduction state of the first dry reed switch 104, and the magnetic change of the first temperature-sensing magnet 103 cannot cause a change in the conduction state of the second dry reed switch 106.

[0282] In this application, the temperature-sensing magnet and the dry reed switch can be paired up by means such as increasing the distance and / or adding magnetic shielding to ensure that the temperature-sensing magnet in any group will not cause magnetic interference to the dry reed switch in other groups.

[0283] In some embodiments, the distance between the first temperature-sensing magnet 103 and the second temperature-sensing magnet 105 is greater than a preset distance 1, and the distance between the first dry reed switch 104 and the second dry reed switch 106 is greater than a preset distance 2. This application does not limit the specific values ​​of the preset distance 1 and the preset distance 2.

[0284] In other embodiments, considering the limited space of the battery cell 100, the first temperature-sensing magnet 103 can be placed inside a first magnetic shield with an opening to adjust the direction of the magnetic field applied by the first temperature-sensing magnet 103 to the corresponding first dry reed switch 104, ensuring that the first temperature-sensing magnet 103 becomes an oriented magnet with the same direction of magnetic field generation. The second temperature-sensing magnet 105 can be placed inside a second magnetic shield with an opening to adjust the direction of the magnetic field applied by the second temperature-sensing magnet 105 to the corresponding second dry reed switch 106, ensuring that the second temperature-sensing magnet 105 becomes an oriented magnet with the same direction of magnetic field generation. This application does not limit the parameters such as the number, layout, and size of the first and second magnetic shields.

[0285] The second dry reed switch 106 and the first dry reed switch 104 are electrically connected to different sampling channels of the battery management system 20, respectively. That is, Figure 15 In this configuration, the first dry reed switch 104 is electrically connected to the sampling channel x of the detection module 201, and the second dry reed switch 106 is electrically connected to the sampling channel y of the detection module 201. The sampling channels x and y of the detection module 201 are different. The sampling channel y of the detection module 201 may include one or more terminals.

[0286] Based on the above electrical connection relationship, the detection module 201 can detect in real time whether the conduction state of the first dry reed switch 104 and the conduction state of the second dry reed switch 106 have changed.

[0287] Therefore, after detecting a change in the conduction state of the first dry reed switch 104, the detection module 201 can send a first detection result to the host unit 202. Upon receiving the first detection result, the host unit 202 can determine that the battery cell 100 has experienced a first-degree thermal anomaly. After detecting a change in the conduction state of the second dry reed switch 106, the detection module 201 can send a second detection result to the host unit 202. Upon receiving the second detection result, the host unit 202 can determine that the battery cell 100 has experienced a second-degree thermal anomaly.

[0288] The specific implementation methods of the first and second detection results can be found in the aforementioned detection results.

[0289] The first and second detection results have different meanings. The first detection result indicates that the battery cell 100 has experienced a first-degree thermal anomaly, where the first degree refers to the internal temperature of the battery cell 100 being equal to or higher than the Curie temperature of the first temperature-sensing magnet 103. The second detection result indicates that the battery cell 100 has experienced a second-degree thermal anomaly, where the second degree refers to the internal temperature of the battery cell 100 being equal to or higher than the Curie temperature of the second temperature-sensing magnet 105.

[0290] The specific implementation method for changing the conduction state of the second dry reed switch 106 can be found in [reference needed]. Figures 9-12B The description of the change in the conduction state of the first dry reed switch 104 is not repeated here.

[0291] It should be noted that, for the same battery cell 100, two sets of paired temperature-sensing magnets and dry reed switches can be installed, but are not limited to, as long as the Curie temperature of the temperature-sensing magnets in each set is different, and the dry reed switches in each set are electrically connected to the battery management system 20 through different sampling channels. For example, three, four, or more sets of paired temperature-sensing magnets and dry reed switches can also be installed in the battery cell 100.

[0292] The following section details the working principle behind the over-temperature warning function for different levels of battery cells.

[0293] Assuming the first dry reed switch 104 and the second dry reed switch 106 adopt... Figure 10 The normally open dry reed pipe shown.

[0294] When a magnetic field exists in the space containing both the first dry reed switch 104 and the second dry reed switch 106, the reed inside the first dry reed switch 104 closes, and the first end P1a and the second end P2a of the first dry reed switch 104 are conductive. At this time, the conductive state of the first dry reed switch 104 is a low-impedance conductive state. The reed inside the second dry reed switch 106 closes, and the first end and the second end of the second dry reed switch 106 are conductive. At this time, the conductive state of the second dry reed switch 106 is a low-impedance conductive state.

[0295] When the magnetic field in the space where the first dry reed switch 104 is located disappears (i.e., there is no magnetic field), the reed inside the first dry reed switch 104 disconnects, and the first end P1a and the second end P2a of the first dry reed switch 104 are disconnected. At this time, the conducting state of the first dry reed switch 104 is a high-impedance non-conducting state.

[0296] When the magnetic field in the space where the second dry reed switch 106 is located disappears (i.e., there is no magnetic field), the reed inside the second dry reed switch 106 disconnects, and the first and second ends of the second dry reed switch 106 are disconnected. At this time, the conduction state of the second dry reed switch 106 is a high-impedance non-conducting state.

[0297] In summary, as the magnetism of the first temperature-sensing magnet 103 disappears, the conduction state of the first dry reed switch 104 can change from a low-resistance conduction state to a high-resistance non-conducting state.

[0298] Therefore, after the battery management system 20 detects that the conduction state of the first dry reed switch 104 changes from a low impedance conduction state to a high impedance non-conduction state, it can determine that the cell 100 has experienced a first degree of thermal anomaly.

[0299] As the magnetism of the second temperature-sensing magnet 105 disappears, the conduction state of the second dry reed switch 106 can change from a low-impedance conduction state to a high-impedance non-conducting state.

[0300] Therefore, after the battery management system 20 detects that the conduction state of the second dry reed switch 106 changes from a low impedance conduction state to a high impedance non-conduction state, it can determine that the cell 100 has experienced a second degree of thermal anomaly.

[0301] Assuming the first dry reed switch 104 and the second dry reed switch 106 adopt... Figure 11 The normally closed dry reed pipe shown.

[0302] When a magnetic field exists in the space containing both the first dry reed switch 104 and the second dry reed switch 106, the reed inside the first dry reed switch 104 disconnects, and the first end P1b and the second end P2b of the first dry reed switch 104 are disconnected. At this time, the conducting state of the first dry reed switch 104 is a high-impedance non-conducting state. Similarly, the reed inside the second dry reed switch 106 disconnects, and the first end and the second end of the second dry reed switch 106 are disconnected. At this time, the conducting state of the second dry reed switch 106 is a high-impedance non-conducting state.

[0303] When the magnetic field in the space where the first dry reed switch 104 is located disappears (i.e., there is no magnetic field), the reed inside the first dry reed switch 104 closes, and the first end P1b and the second end P2b of the first dry reed switch 104 are connected. At this time, the conducting state of the first dry reed switch 104 is a low-impedance conducting state.

[0304] When the magnetic field in the space where the second dry reed switch 106 is located disappears (i.e., there is no magnetic field), the reed inside the second dry reed switch 106 closes, and the first and second ends of the second dry reed switch 106 are connected. At this time, the conducting state of the second dry reed switch 106 is a low-impedance conducting state.

[0305] In summary, as the magnetism of the first temperature-sensing magnet 103 disappears, the conduction state of the first dry reed switch 104 can change from a high-impedance non-conducting state to a low-impedance conducting state.

[0306] Therefore, after the battery management system 20 detects that the conduction state of the first dry reed switch 104 changes from a high-impedance non-conducting state to a low-impedance conducting state, it can determine that the cell 100 has experienced a first degree of thermal anomaly.

[0307] As the magnetism of the second temperature-sensing magnet 105 disappears, the conduction state of the second dry reed switch 106 can change from a high-impedance non-conducting state to a low-impedance conducting state.

[0308] Therefore, after the battery management system 20 detects that the conduction state of the second dry reed switch 106 changes from a high-impedance non-conducting state to a low-impedance conducting state, it can determine that the cell 100 has experienced a second degree of thermal anomaly.

[0309] Assuming the first dry reed switch 104 and the second dry reed switch 106 adopt... Figures 12A-12B The switchable dry reed switch shown is shown.

[0310] When a magnetic field exists in the space containing both the first dry reed switch 104 and the second dry reed switch 106, the reed inside the first dry reed switch 104 switches the corresponding connection terminals. That is, the first end Q2 and the second end Q1 of the first dry reed switch 104 are connected, and the first end Q2 and the third end Q3 of the first dry reed switch 104 are disconnected. At this time, the first channel of the first dry reed switch 104 is in a low-impedance conducting state, and the second channel of the first dry reed switch 104 is in a high-impedance non-conducting state.

[0311] The reed switch inside the second dry reed switch 106 switches the corresponding connection terminals, that is, the first and second ends of the second dry reed switch 106 are connected, and the first and third ends of the second dry reed switch 106 are disconnected. At this time, the first channel of the second dry reed switch 106 is in a low-impedance conducting state, and the second channel of the second dry reed switch 106 is in a high-impedance non-conducting state.

[0312] When the magnetic field in the space where the first dry reed switch 104 is located disappears (i.e., there is no magnetic field), the reed inside the first dry reed switch 104 switches the corresponding connection terminals. That is, the first end Q2 and the second end Q1 of the first dry reed switch 104 are disconnected, and the first end Q2 and the third end Q3 of the first dry reed switch 104 are connected. At this time, the first channel of the first dry reed switch 104 is in a high-impedance non-conducting state, and the second channel of the first dry reed switch 104 is in a low-impedance conducting state.

[0313] When the magnetic field in the space where the second dry reed switch 106 is located disappears (i.e., there is no magnetic field), the reed inside the second dry reed switch 106 switches the corresponding connection terminals. That is, the first and second ends of the second dry reed switch 106 are disconnected, and the first and third ends of the second dry reed switch 106 are connected. At this time, the first channel of the second dry reed switch 106 is in a high-impedance non-conducting state, and the second channel of the second dry reed switch 106 is in a low-impedance conducting state.

[0314] In summary, as the magnetism of the first temperature-sensing magnet 103 disappears, the conduction state of the first channel of the first dry reed switch 104 can change from a low-impedance conduction state to a high-impedance non-conducting state, and the conduction state of the second channel of the first dry reed switch 104 can change from a high-impedance non-conducting state to a low-impedance conduction state.

[0315] Therefore, after the battery management system 20 detects that the conduction state of the first channel of the first dry reed switch 104 changes from a low impedance conduction state to a high impedance non-conducting state, and the conduction state of the second channel of the first dry reed switch 104 changes from a high impedance non-conducting state to a low impedance conduction state, it can determine that the cell 100 has experienced a first degree of thermal anomaly.

[0316] As the magnetism of the second temperature-sensing magnet 105 disappears, the conduction state of the first channel of the second dry reed switch 106 can change from a low-impedance conduction state to a high-impedance non-conducting state, and the conduction state of the second channel of the second dry reed switch 106 can change from a high-impedance non-conducting state to a low-impedance conduction state.

[0317] Therefore, after the battery management system 20 detects that the conduction state of the first channel of the second dry reed switch 106 changes from a low impedance conduction state to a high impedance non-conducting state, and the conduction state of the second channel of the second dry reed switch 106 changes from a high impedance non-conducting state to a low impedance conduction state, it can determine that the cell 100 has experienced a second degree of thermal anomaly.

[0318] In this application, the battery cell 100 is equipped with a first temperature-sensing magnet 103 and a second temperature-sensing magnet 105 with different Curie temperatures. The first dry reed switch 104 and the second dry reed switch 106 are electrically connected to the battery management system 20 through different sampling channels, so that the battery management system 20 can clearly understand the degree of thermal anomaly and the corresponding temperature of the battery cell 100. This is beneficial for the battery management system 20 to perform different levels of safety protection on the battery cell 100, and also ensures the timeliness and accuracy of thermal anomalies in the battery cell 100. It avoids the impact of insufficient or excessive warnings, and realizes different levels of over-temperature warning functions for the battery cell 100.

[0319] For the multiple cells 100 in the battery module 10, some or all of the cells 100 can realize an over-temperature warning function based on the description of the above embodiments, or different levels of over-temperature warning functions can be realized for the cells 100. Therefore, each of these cells 100 can be electrically connected to the battery management system 20 through one or more sampling channels.

[0320] Considering the limited sampling channels of the battery management system 20, this application can divide multiple battery cells 100, such as two, three, or four, into a group. All dry reed switches in the group of battery cells 100 are connected in series and / or in parallel, and all dry reed switches can also be electrically connected to the battery management system 20 through the same sampling channel.

[0321] Thus, the battery management system 20 can detect whether there is thermal abnormality in multiple cells 100 through a small number of sampling channels, which facilitates the joint safety protection of multiple cells 100, saves the sampling channels and connection terminals of the battery management system 20, and quickly realizes the over-temperature warning function of the cells 100. It solves the problem that the limited number of sampling channels of the battery management system 20 results in a small number of detection positions for cells 100.

[0322] All of the aforementioned dry reeds can be used Figure 10 The normally open dry reed switch shown is connected in series. Alternatively, all dry reed switches can be... Figure 11 The normally closed dry reed switch shown is connected in parallel with all dry reed switches. Alternatively, all dry reed switches can be... Figures 12A-12B The switchable dry reed switch shown has all dry reed switches connected in series and parallel.

[0323] Furthermore, all the dry reed switches in this group of cells 100 are connected in parallel, and all the dry reed switches can also be electrically connected to the battery management system 20 through different sampling channels. This allows the battery management system 20 to accurately detect which of the multiple cells 100 has a thermal anomaly, facilitating the location of the thermal anomaly among the multiple cells 100.

[0324] The following section details battery 1, which corresponds to the above description. For ease of explanation, this application uses two cells grouped together as an example.

[0325] Please see Figures 17-18 , Figures 17-18 A partial structural schematic diagram of a battery provided in one embodiment of this application is shown.

[0326] In some embodiments, such as Figures 17-18As shown, in the battery 1 of this application, the battery module 10 may include: a first cell 100a and a second cell 100b.

[0327] It should be noted that, for multiple cells 100, the battery module 10 may, but is not limited to, arrange the first cell 100a and the second cell 100b as a group, as long as the dry reed switch in each group of cells 100 is electrically connected to the battery management system 20 through the same sampling channel.

[0328] Figure 17 In the process, the first battery cell 100a and the second battery cell 100b may respectively include, as follows: Figure 4 The bare battery cell 101, electrolyte 107, battery cell housing 102, first temperature-sensing magnet 103, and first dry reed switch 104 are shown.

[0329] The first dry reed switch 104 in the first battery cell 100a is connected in series and / or in parallel with the first dry reed switch 104 in the second battery cell 100b. The first dry reed switch 104 in the first battery cell 100a is also connected to the sampling channel x of the detection module 201.

[0330] Based on the aforementioned electrical connections, after detecting a change in the conduction state of the first dry reed switch 104 in the first battery cell 100a and / or the first dry reed switch 104 in the second battery cell 100b, the detection module 201 can send the detection result to the host unit. Upon receiving the detection result, the host unit 202 can determine that the first battery cell 100a and / or the second battery cell 100b have experienced a first-degree thermal anomaly.

[0331] Figure 18 In the middle, the first cell 100a and the second cell 100b are in Figure 17 Based on the architecture shown, it may also include, as follows: Figure 15 The second temperature-sensing magnet 105 and the second dry reed switch 106 are shown.

[0332] The second dry reed switch 106 in the first battery cell 100a is connected in series and / or in parallel with the second dry reed switch 106 in the second battery cell 100b. The second dry reed switch 106 in the first battery cell 100a is also connected to the sampling channel y of the detection module 201.

[0333] Based on the above electrical connection relationship, after the detection module 201 detects that the conduction state of the second dry reed switch 106 in the first battery cell 100a and / or the conduction state of the second dry reed switch 106 in the second battery cell 100b has changed, it determines that the first battery cell 100a and / or the second battery cell 100b have experienced a second degree of thermal anomaly.

[0334] It should be noted that the electrical connection method between the first dry reed switch 104 in the first battery cell 100a and the first dry reed switch 104 in the second battery cell 100b may be the same as or different from the electrical connection method between the second dry reed switch 106 in the first battery cell 100a and the second dry reed switch 106 in the second battery cell 100b, and each electrical connection method and its corresponding working principle are similar. Therefore, for ease of explanation, this application will take the example of the second dry reed switch 106 in the first battery cell 100a and the second dry reed switch 106 in the second battery cell 100b having the same electrical connection method for detailed explanation.

[0335] Below, in conjunction with Figures 19-21 This section details the working principle of the over-temperature warning function for multiple battery cells (100).

[0336] Please see Figure 19 , Figure 19 A partial structural schematic diagram of a battery provided in one embodiment of this application is shown.

[0337] like Figure 19 As shown, the first dry reed switch 104 in the first cell 100a and the first dry reed switch 104 in the second cell 100b adopt... Figure 10 The normally open dry reed switch shown is connected in series with the first dry reed switch 104 in the first battery cell 100a and the first dry reed switch 104 in the second battery cell 100b.

[0338] Specifically, the first end P1a of the first dry reed switch 104 in the first battery cell 100a is electrically connected to the first end a1 of the detection module 201. The second end P2a of the first dry reed switch 104 in the first battery cell 100a is electrically connected to the first end P1a of the first dry reed switch 104 in the second battery cell 100b. The second end P2a of the first dry reed switch 104 in the second battery cell 100b is electrically connected to the second end a2 of the detection module 201.

[0339] When there is a magnetic field in the space where the first dry reed switch 104 in the first cell 100a and the first dry reed switch 104 in the second cell 100b are located, the reed inside the first dry reed switch 104 in the first cell 100a closes, and the first end P1a and the second end P2a of the first dry reed switch 104 in the first cell 100a are connected. The reed inside the first dry reed switch 104 in the second cell 100b closes, and the first end P1a and the second end P2a of the first dry reed switch 104 in the second cell 100b are connected.

[0340] At this time, the conduction state of the first dry reed switch 104 in the first cell 100a and the conduction state of the first dry reed switch 104 in the second cell 100b can be regarded as a low-impedance conduction state.

[0341] When the magnetic field in the space where at least one of the first dry reeds 104 in the first cell 100a and the first dry reed 104 in the second cell 100b is located disappears (i.e. there is no magnetic field), taking the first dry reed 104 in the second cell 100b as an example, the reed inside the first dry reed 104 in the second cell 100b is disconnected, and the first end P1a and the second end P2a of the first dry reed 104 in the second cell 100b are disconnected.

[0342] At this time, the first dry reed switch 104 in the second cell 100b can be regarded as a high-impedance non-conducting state.

[0343] Therefore, after the battery management system 20 detects that the first dry reed switch 104 in the second cell 100b changes from a low-impedance conducting state to a high-impedance non-conducting state, it can determine that the first cell 100a and / or the second cell 100b has a thermal abnormality.

[0344] Please see Figure 20 , Figure 20 A partial structural schematic diagram of a battery provided in one embodiment of this application is shown.

[0345] like Figure 20 As shown, the first dry reed switch 104 in the first cell 100a and the first dry reed switch 104 in the second cell 100b adopt... Figure 11 The normally closed dry reed switch shown is connected in parallel with the first dry reed switch 104 in the first battery cell 100a and the first dry reed switch 104 in the second battery cell 100b.

[0346] Specifically, the first end P1b of the first dry reed switch 104 in the first battery cell 100a and the first end P1b of the first dry reed switch 104 in the second battery cell 100b are both electrically connected to the first end a1 of the detection module 201. The second ends P2b of the first dry reed switch 104 in the first battery cell 100a and the second end P2b of the first dry reed switch 104 in the second battery cell 100b are both electrically connected to the second end a2 of the detection module 201.

[0347] When a magnetic field exists in the space containing the first dry reed switch 104 in the first cell 100a and the first dry reed switch 104 in the second cell 100b, the reed inside the first dry reed switch 104 in the first cell 100a breaks, and the first end P1b and the second end P2b of the first dry reed switch 104 in the first cell 100a are disconnected. Similarly, the reed inside the first dry reed switch 104 in the second cell 100b breaks, and the first end P1b and the second end P2b of the first dry reed switch 104 in the second cell 100b are disconnected.

[0348] At this time, the conducting state of the first dry reed switch 104 in the first cell 100a and the conducting state of the first dry reed switch 104 in the second cell 100b can be regarded as a high-impedance non-conducting state.

[0349] When the magnetic field in the space where at least one of the first dry reeds 104 in the first cell 100a and the first dry reed 104 in the second cell 100b is located disappears (i.e. there is no magnetic field), taking the first dry reed 104 in the second cell 100b as an example, the reed inside the first dry reed 104 in the second cell 100b is closed, and the first end P1b and the second end P2b of the first dry reed 104 in the second cell 100b are connected.

[0350] At this time, the conduction state of the first dry reed switch 104 in the second cell 100b can be regarded as a low-impedance conduction state.

[0351] Therefore, after the battery management system 20 detects that the conduction state of the first dry reed switch 104 in the second cell 100b changes from a high-impedance non-conducting state to a low-impedance conducting state, it can determine that the first cell 100a and / or the second cell 100b has a thermal abnormality.

[0352] Please see Figure 21 , Figure 21 A partial structural schematic diagram of a battery provided in one embodiment of this application is shown.

[0353] like Figure 21 As shown, the first dry reed switch 104 in the first cell 100a and the first dry reed switch 104 in the second cell 100b adopt... Figures 12A-12B The switching dry reed switch shown has its first channel in series connected to the first dry reed switch 104 in the first cell 100a and the first dry reed switch 104 in the second cell 100b, and its second channel in parallel connected to the second channel of the third dry reed switch 110.

[0354] In the first channel, the first end Q2 of the first dry reed switch 104 in the first battery cell 100a is electrically connected to the first end Q2 of the first dry reed switch 104 in the second battery cell 100b. The second end Q1 of the first dry reed switch 104 in the first battery cell 100a is electrically connected to the second end a2 of the detection module 201. The first end Q2 of the first dry reed switch 104 in the second battery cell 100b is electrically connected to the first end a1 of the detection module 201.

[0355] In the second channel, the first end Q2 of the first dry reed switch 104 in the second battery cell 100b is electrically connected to the first end a1 of the detection module 201. The third end Q3 of the first dry reed switch 104 in the first battery cell 100a and the third end Q3 of the first dry reed switch 104 in the second battery cell 100b are both electrically connected to the third end a3 of the detection module 201.

[0356] When there is a magnetic field in the space where the first dry reed switch 104 in the first cell 100a and the first dry reed switch 104 in the second cell 100b are located, the first terminal Q2 and the second terminal Q1 of the first dry reed switch 104 in the first cell 100a are conducting, and the first terminal Q2 and the second terminal Q1 of the first dry reed switch 104 in the second cell 100b are also conducting. At this time, the conduction state of the first channel can be regarded as a low-impedance conduction state.

[0357] In the first cell 100a, the first terminal Q2 and the third terminal Q3 of the first dry reed switch 104 are disconnected, and in the second cell 100b, the first terminal Q2 and the third terminal Q3 of the first dry reed switch 104 are also disconnected. At this time, the conduction state of the second channel can be considered as a high-impedance non-conducting state.

[0358] When the magnetic field in the space where at least one of the first dry reeds 104 in the first cell 100a and the first dry reed 104 in the second cell 100b is located disappears (i.e. there is no magnetic field), taking the first dry reed 104 in the second cell 100b as an example, the reed inside the first dry reed 104 in the second cell 100b switches to the corresponding connection terminal.

[0359] In the second cell 100b, the first terminal Q2 and the second terminal Q1 of the first dry reed switch 104 are disconnected. At this time, the conduction state of the first channel can be regarded as a high-impedance non-conducting state.

[0360] In the second cell 100b, the first terminal Q2 and the third terminal Q3 of the first dry reed switch 104 are turned on. At this time, the conduction state of the second channel can be regarded as a low-impedance conduction state.

[0361] Therefore, after the battery management system 20 detects that the conduction state of the first channel changes from a low impedance conduction state to a high impedance non-conducting state, and the conduction state of the second channel changes from a high impedance non-conducting state to a low impedance conduction state, it can determine that the first cell 100a and / or the second cell 100b have experienced a thermal abnormality.

[0362] In this application, for the first battery cell 100a and the second battery cell 100b, a paired first temperature-sensing magnet 103 and a first dry reed switch 104 can be respectively arranged. With the help of the first dry reed switch 104 in the first battery cell 100a and the second battery cell 100b, they are electrically connected to the battery management system 20 through the same sampling channel. This allows the battery management system 20 to jointly monitor the temperature status of the first battery cell 100a and the second battery cell 100b through a smaller number of connection terminals in the same sampling channel, which facilitates rapid early warning when thermal anomalies occur in the first battery cell 100a and / or the second battery cell 100b.

[0363] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cell, characterized in that, include: Bare battery cell, electrolyte, battery cell casing, first temperature-sensing magnet, first dry reed switch, second temperature-sensing magnet, and second dry reed switch; The battery cell housing is made of a non-magnetic shielding material and has a receiving cavity. The receiving cavity is filled with electrolyte. The bare battery cell is placed inside the receiving cavity. The first and second temperature-sensing magnets are placed inside or outside the receiving cavity. The first and second dry reed switches are placed outside the receiving cavity. The first and second dry reed switches are respectively used for electrical connection with different sampling channels of the battery management system. The Curie temperature of the second temperature-sensing magnet is different from that of the first temperature-sensing magnet. The first temperature-sensing magnet is used to sense the temperature inside the battery cell; wherein, if the temperature inside the battery cell is equal to or higher than the Curie temperature of the first temperature-sensing magnet, the magnetism of the first temperature-sensing magnet disappears, and the Curie temperature of the first temperature-sensing magnet matches the thermal runaway critical temperature of the battery cell. After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed switch changes, so that the battery management system determines that the cell has experienced a first degree of thermal anomaly after detecting the change in the conduction state of the first dry reed switch. The second temperature-sensing magnet is used to sense the temperature inside the battery cell; wherein, if the temperature inside the battery cell is equal to or higher than the Curie temperature of the second temperature-sensing magnet, the magnetism of the second temperature-sensing magnet disappears, and the Curie temperature of the second temperature-sensing magnet matches the thermal runaway critical temperature of the battery cell. After the magnetism of the second temperature-sensing magnet disappears, the conduction state of the second dry reed switch changes, so that the battery management system determines that the cell has experienced a second degree of thermal anomaly after detecting the change in the conduction state of the second dry reed switch. The second degree is different from the first degree. The magnetic transformation of the first temperature-sensing magnet cannot cause a change in the conduction state of the second dry reed switch, and the magnetic transformation of the second temperature-sensing magnet cannot cause a change in the conduction state of the first dry reed switch.

2. The battery cell according to claim 1, characterized in that, The Curie temperature of the first or second temperature-sensing magnet is lower than the thermal runaway critical temperature of the battery cell.

3. The battery cell according to claim 1 or 2, characterized in that, The first dry reed is a normally open dry reed; After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed switch changes from a low-impedance conducting state to a high-impedance non-conducting state.

4. The battery cell according to claim 1 or 2, characterized in that, The first dry reed is a normally closed dry reed; After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed switch changes from a high-impedance non-conducting state to a low-impedance conducting state.

5. The battery cell according to claim 1 or 2, characterized in that, The first dry reed is a switching type dry reed, and the first end and the second end of the first dry reed form a first channel, and the first end and the third end of the first dry reed form a second channel. After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first channel changes from a low-impedance conduction state to a high-impedance non-conducting state, and the conduction state of the second channel changes from a high-impedance non-conducting state to a low-impedance conduction state.

6. The battery cell according to claim 1 or 2, characterized in that, The first dry reed switch is fixed to the outside of the cell housing.

7. The battery cell according to claim 6, characterized in that, The first dry reed switch is fixed to the outside of the cell housing, comprising: the first dry reed switch is fixed to the outer surface of the cell housing.

8. The battery cell according to claim 1 or 2, characterized in that, The first temperature-sensing magnet is fixed to the inner surface of the battery cell housing; Alternatively, the first temperature-sensing magnet may be fixed to the outside of the cell housing.

9. The battery cell according to claim 8, characterized in that, The first temperature-sensing magnet is fixed to the outside of the cell housing, meaning that the first temperature-sensing magnet is fixed to the outer surface of the cell housing.

10. A battery module, characterized in that, include: At least two battery cells as described in any one of claims 1-9; The first dry reed switches of the at least two battery cells are connected in series or in parallel, and the second dry reed switches of the at least two battery cells are connected in series or in parallel.

11. The battery module according to claim 10, characterized in that, When the battery module includes a first cell and a second cell, the first dry reed switch in the first cell is connected in series with the first dry reed switch in the second cell, and the second dry reed switch in the first cell is connected in series with the second dry reed switch in the second cell.

12. The battery module according to claim 10, characterized in that, When the battery module includes a first cell and a second cell, the first dry reed switch in the first cell is connected in parallel with the first dry reed switch in the second cell, and the second dry reed switch in the first cell is connected in parallel with the second dry reed switch in the second cell.

13. A battery, characterized in that, include: A battery management system and a battery module as described in any one of claims 10-12; The battery management system is used to detect the conduction state of the first dry reed switch and the second dry reed switch. After detecting a change in the conduction state of the first dry reed switch, it determines that the battery cell has experienced a first degree of thermal anomaly. After detecting a change in the conduction state of the second dry reed switch, it determines that the battery cell has experienced a second degree of thermal anomaly.

14. The battery according to claim 13, characterized in that, The battery management system includes: a detection module and a host unit; The detection module is electrically connected to the first dry reed switch and the second dry reed switch in the battery module, and the detection module is also electrically connected to the host unit. The detection module is used to send a detection result to the host unit after detecting a change in the conduction state of the first dry reed switch and / or the second dry reed switch. The host unit is configured to determine, upon receiving the detection result, that a thermal abnormality has occurred in the battery cell in the battery module corresponding to the first dry reed switch and / or the second dry reed switch.

15. An electronic device, characterized in that, include: The battery as described in claim 13 or 14.

16. A mobile device, characterized in that, include: The battery as described in claim 13 or 14.

17. An energy storage device, characterized in that, include: The battery as described in claim 13 or 14.

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