WO2024037372A1

WO2024037372A1 - Battery cell, battery module, battery, electronic device, mobile apparatus, and energy storage apparatus

Info

Publication number: WO2024037372A1
Application number: PCT/CN2023/111534
Authority: WO
Inventors: 宋晓娜; 田雷雷; 何军; 李军
Original assignee: 华为技术有限公司
Priority date: 2022-08-18
Filing date: 2023-08-07
Publication date: 2024-02-22
Also published as: CN117638235A

Abstract

Provided in the present application are a battery cell, a battery module, a battery, an electronic device, a mobile apparatus, and an energy storage apparatus. The battery cell comprises a bare battery cell, a battery cell case, a first temperature-sensing magnet and a first reed switch, wherein the first temperature-sensing magnet is used for sensing the temperature inside the battery cell, and if the temperature inside the battery cell is equal to or higher than a 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 a thermal runaway critical temperature of the battery cell; and after the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first reed switch changes, such that a battery management system determines, after detecting the change in the conduction state of the first reed switch, that a thermal anomaly occurs in the battery cell. Accordingly, an accurate and timely early warning can be provided in terms of thermal anomalies of a battery cell.

Description

Cells, battery modules, batteries, electronic equipment, mobile devices and energy storage devices

This application requires priority for Chinese patent applications submitted to the State Intellectual Property Office on August 18, 2022, with the application number 202210995976.1 and the application name "Battery cells, battery modules, batteries, electronic equipment, mobile devices and energy storage devices" rights, the entire contents of which are incorporated herein by reference.

Technical field

The present application relates to the field of battery technology, and in particular to a battery core, a battery module, a battery, an electronic device, a mobile device and an energy storage device.

Background technique

In application fields such as new energy vehicles, electric bicycles, and portable energy storage, the demand for lithium-ion batteries is growing rapidly. At present, the energy density and power density of lithium-ion battery cells are increasing day by day, which requires cells and batteries to meet more stringent safety challenges.

Due to abuse failure, reliability failure, design defects, and manufacturing defect failures, thermal abnormalities of the battery core are often caused, and even overheating failure of the battery core and battery can lead to safety issues such as fire, spontaneous combustion, and explosion.

Therefore, how to accurately detect thermal abnormalities of battery cores is an urgent problem that needs to be solved.

Contents of the invention

This application provides a battery core, a battery module, a battery, an electronic device, a mobile device and an energy storage device, which can provide accurate and timely early warning of thermal anomalies in the battery core.

In a first aspect, this application provides a battery core, including: a bare battery core, an electrolyte, a battery core shell, a first temperature-sensing magnet, and a first dry reed tube;

Among them, the battery core shell is made of non-magnetic shielding material. The battery core shell has an accommodation cavity. Electrolyte is injected into the accommodation cavity. The bare battery core is placed in the accommodation cavity. The first temperature-sensing magnet is placed in the accommodation cavity or the accommodation cavity. Outside, the first dry reed tube is placed outside the accommodation cavity, and the first dry reed tube is used for electrical connection with the battery management system;

The first temperature-sensing magnet is used to sense the temperature inside the battery core; if the temperature inside the battery 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 first temperature-sensing magnet disappears. The Curie temperature of the temperature-sensitive magnet matches the thermal runaway critical temperature of the battery core;

After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed tube changes, so that the battery management system determines the battery core after detecting the change in the conduction state of the first dry reed tube. A thermal abnormality has occurred.

Through the battery provided by the first aspect, with the cooperation of the first temperature-sensing magnet and the first dry reed tube, the temperature of the battery core when thermal abnormality occurs can be accurately detected, and the thermal abnormality of the battery core can be accurately and accurately detected. Timely early warning solves the problem of lagging or inaccurate early warning response to thermal anomalies inside the battery core, improves the response speed to early warning of thermal anomalies in the battery core, and is conducive to improving the safety protection capabilities of the battery. At the same time, using the detection response method of wireless magnetic induction, based on the layout of the temperature-sensing devices such as the first temperature-sensing magnet and the first dry reed tube, there is no need to destroy the complete structure of the battery shell, and will not cause problems such as package leakage. , helps to extend the service life of the battery, ensures the reliability and safety of the battery, and is conducive to large-scale mass production and use.

In addition, the cooperation between the first temperature-sensing magnet and the first dry reed in the battery provided by the first aspect can also record whether the first temperature-sensing magnet has undergone a magnetic transition, and/or, the first Whether the conduction state of the dry reed switch has changed, the above situation can be used as a basis for identifying whether the battery core has overheated abnormality, avoiding the safety risks caused by the overheating abnormality of the battery core, and also avoiding the battery cells that have this safety risk. Continue to flow into the next processing and use link to avoid causing greater system safety problems.

In a possible design, the battery core also includes: a second temperature-sensing magnet and a second dry reed tube; wherein the Curie temperature of the second temperature-sensing magnet is different from the Curie temperature of the first temperature-sensing magnet. , the second temperature sensing magnet is placed inside or outside the accommodation cavity, the second dry reed tube is placed outside the accommodation cavity, the second dry type reed tube and the first dry type reed tube are respectively used for battery management The different sampling channels of the system are electrically connected;

After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed is changed so that the battery management system can After detecting that the conduction state of the first dry-type reed tube has changed, it is determined that the battery core has a thermal abnormality, specifically: after the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry-type reed tube changes. , so that the battery management system determines that the first degree of thermal abnormality has occurred in the battery core after detecting a change in the conduction state of the first dry reed tube;

The second temperature-sensing magnet is used to sense the temperature inside the battery core; if the temperature inside the battery core 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 second temperature-sensing magnet disappears. The Curie temperature of the temperature-sensitive magnet matches the thermal runaway critical temperature of the battery core;

After the magnetism of the second temperature sensing magnet disappears, the conduction state of the second dry reed tube changes, so that the battery management system determines the battery core after detecting the change in the conduction state of the second dry reed tube. A second degree of thermal anomaly occurs, and the second degree is different from the first degree.

With the battery provided in this embodiment, the first temperature-sensing magnet and the second temperature-sensing magnet with different Curie temperatures can be arranged for the same battery core, and the first dry-type reed tube and the second dry-type reed tube are respectively connected with The electrical connection of different sampling channels of the battery management system allows the battery management system to know the degree of thermal anomaly in the same battery cell and the corresponding temperature level reached, which is conducive to the battery management system to perform different tasks according to the degree of thermal anomaly of the battery cell. The security protection strategy of different levels realizes the over-temperature warning function of different levels of the same battery cell.

Among them, the thermal runaway critical temperature of the battery core is greater than the maximum temperature value of the battery core during normal operation.

In a possible design, the Curie temperature of the first temperature-sensitive magnet or the Curie temperature of the second temperature-sensitive magnet is less than the thermal runaway critical temperature of the electric core.

Considering that the Curie temperature of the first temperature-sensing magnet may be set relatively close to the thermal runaway critical temperature of the battery core, it may happen that the battery core has actually experienced thermal anomalies, but the battery management system does not issue an early warning. Based on this, the present application can set the Curie temperature of the second temperature-sensing magnet to be less than the Curie temperature of the first temperature-sensing magnet, and the Curie temperature of the first temperature-sensing magnet to be less than the thermal runaway critical temperature of the battery core, so that the second temperature-sensing magnet can pass the second temperature-sensing magnet. The setting of the thermomagnet can quickly sense thermal abnormalities in the battery core, solving the problem of insufficient timely warning due to the Curie temperature setting of a single temperature-sensing magnet being too high. Or, considering that the Curie temperature of the first temperature-sensing magnet may be set much lower than the thermal runaway critical temperature of the battery core, it may happen that the battery core has not actually experienced thermal abnormality, but the battery management system has issued an early warning. Case. Based on this, the present application can set the Curie temperature of the second temperature-sensing magnet to be greater than the Curie temperature of the first temperature-sensing magnet, and the Curie temperature of the second temperature-sensing magnet to be less than the thermal runaway critical temperature of the battery core, so that the second temperature-sensing magnet can pass the second temperature-sensing magnet. The setting of the thermomagnet can accurately detect thermal abnormalities in the battery core, solving the problem of too frequent early warnings caused by too low a Curie temperature setting of a single temperature-sensing magnet.

To sum up, this application can set up multiple pairs of temperature-sensing magnets and dry reed switches, such as two, three, or four groups, so that the battery management system can take corresponding measures in a timely manner according to different degrees of thermal anomalies in the cells. Battery over-temperature management strategies, such as battery cooling system cooling or main circuit disconnection, avoid the temperature inside the battery core from continuing to rise and prevent thermal runaway of the battery core due to the temperature inside the battery core continuing to rise. The corresponding degree of critical temperature Thermal anomalies can also accurately realize the battery over-temperature warning function of the battery core, saving the overhead caused by too many warnings due to inaccurate warnings, and helping the battery to continue to provide normal power supply.

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

After the magnetism of the temperature-sensitive magnet disappears, the conduction state of the dry reed tube changes from a low-impedance conduction state to a high-impedance non-conduction state.

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

After the magnetism of the temperature-sensitive magnet disappears, the conduction state of the dry reed tube changes from a high-impedance non-conduction state to a low-impedance conduction state.

In one possible design, the dry reed tube is a switching dry reed tube, the first end and the second end of the dry reed tube constitute the first channel, and the first end and the second end of the dry reed tube The third end forms the second channel;

After the magnetism of the temperature-sensitive magnet disappears, the conduction state of the first channel changes from a low-impedance conduction state to a high-impedance non-conduction state, and the conduction state of the second channel changes from a high-impedance non-conduction state to a low-impedance conduction state. communication status.

The battery provided by this embodiment provides a variety of feasible implementation methods for the dry reed switch in the battery.

In one possible design, the dry reed tube is fixed on the outer surface of the battery housing;

Alternatively, the dry reed tube is fixed on the outside of the battery case.

In one possible design, the temperature-sensitive magnet is fixed on the inner surface of the battery core housing;

Alternatively, the temperature-sensitive magnet is fixed on the outer surface of the battery core housing;

Alternatively, the temperature-sensitive magnet is fixed outside the battery core housing.

In a second aspect, this application provides a battery module, including: at least one battery cell in the first aspect and any possible design of the first aspect.

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

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

Wherein, the dry reed in the first cell and the dry reed in the second cell are also used to electrically connect with the same sampling channel of the battery management system, so that the battery management system detects the first battery After the conduction state of the dry reed switch in the core and/or the conduction state of the dry reed switch in the second battery core changes, it is determined that there is electricity in the first battery core and the second battery core. Thermal abnormality occurs in the core.

The battery module provided by this embodiment is designed to electrically connect the dry reeds in multiple cells in series and/or in parallel, and electrically connect them to the same sampling channel of the battery management system, so that the battery management system It can monitor whether the cells in multiple cells have thermal abnormalities, solves the problem of the limited number of sampling channels in the battery management system, and improves the response speed for early warning of thermal abnormalities in the cells in multiple cells. , which is conducive to improving the sensitivity and reliability of detection.

The beneficial effects of the battery module provided in the above-mentioned second aspect can be referred to the beneficial effects brought by the first aspect and any possible design implementation of the first aspect, and will not be described again here.

In a third aspect, this application provides a battery, including: a battery management system, the second aspect, and a battery module in any possible design of the second aspect;

The battery management system is used to detect the conduction state of the first dry reed tube, and determine that a thermal abnormality occurs in the battery core after detecting a change in the conduction state of the first dry reed tube.

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

Among them, the detection module is electrically connected to the dry reed tube in the battery module, and the detection module is also electrically connected to the host unit;

A detection module, used to send a detection result to the host unit after detecting a change in the conduction state of the dry reed tube;

The host unit is used to determine that the battery core corresponding to the dry reed switch in the battery module has a thermal abnormality after receiving the detection result.

Wherein, the detection module is integrated and arranged in the host unit; or, the detection module and the host unit are arranged separately.

The beneficial effects of the battery provided in the above third aspect can be referred to the beneficial effects brought by the second aspect and any possible design implementation of the second aspect, and will not be described again here.

In a fourth aspect, this application provides an electronic device, including: a battery in the third aspect and any possible design of the third aspect.

In a fifth aspect, this application provides a mobile device, including: the battery in the third aspect and any possible design of the third aspect.

In a sixth aspect, this application provides an energy storage device, including: a battery in the third aspect and any possible design of the third aspect.

The beneficial effects of the electronic equipment, mobile devices and energy storage devices provided by the above aspect can be found in the above third aspect and the beneficial effects brought about by each possible implementation of the third aspect, and will not be described again here.

Description of drawings

Figure 1 is a schematic diagram of a battery over-temperature management strategy provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of a battery provided by an embodiment of the present application;

Figure 3 is a partial structural schematic diagram of a battery provided by an embodiment of the present application;

Figure 4 is a schematic flow chart of a battery thermal abnormality early warning method provided by an embodiment of the present application;

Figure 5 is a Semenov heat temperature diagram provided by an embodiment of the present application;

Figure 6 is a schematic diagram of the relationship between magnetism and temperature of a temperature-sensitive magnet provided by an embodiment of the present application;

Figure 7 is a schematic structural diagram of a battery core provided by an embodiment of the present application;

Figure 8 is a schematic structural diagram of a battery core provided by an embodiment of the present application;

Figure 9 is a partial structural schematic diagram of a battery provided by an embodiment of the present application;

Figure 10 is a schematic diagram of the working principle of a normally open dry reed provided by an embodiment of the present application;

Figure 11 is a schematic diagram of the working principle of a normally closed dry reed provided by an embodiment of the present application;

Figure 12A is a partial structural schematic diagram of a battery provided by an embodiment of the present application;

Figure 12B is a schematic diagram of the working principle of a switching dry reed provided by an embodiment of the present application;

Figure 13 is a schematic structural diagram of a detection module provided by an embodiment of the present application;

Figure 14 is a schematic structural diagram of a detection module provided by an embodiment of the present application;

Figure 15 is a partial structural schematic diagram of a battery provided by an embodiment of the present application;

Figure 16 is a schematic flow chart of a battery thermal abnormality early warning method provided by an embodiment of the present application;

Figure 17 is a partial structural schematic diagram of a battery provided by an embodiment of the present application;

Figure 18 is a partial structural diagram of a battery provided by an embodiment of the present application;

Figure 19 is a partial structural schematic diagram of a battery provided by an embodiment of the present application;

Figure 20 is a partial structural schematic diagram of a battery provided by an embodiment of the present application;

Figure 21 is a partial structural diagram of a battery provided by an embodiment of the present application.

Explanation of reference symbols:

1—battery;

10—Battery module; 20—Battery management system;

100—battery cell; 100a—the first battery cell; 100b—the second battery cell;

101—bare battery core; 102—battery core shell; 103—first temperature-sensing magnet; 104—first dry reed tube;

105—the second temperature-sensitive magnet; 106—the second dry reed; 107—electrolyte;

201—Detection module; 202—Host unit.

Detailed ways

In this application, "at least one" refers to one or more, and "plurality" refers to two or more. "And/or" describes the association of associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the related objects are in an "or" relationship. "At least one of the following" or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items). For example, at least one of a alone, b alone, 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 combination of a, b and c, where a, b, c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. The terms "center", "longitudinal", "horizontal", "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or positional relationship based on that shown in the drawings. The orientation or positional relationship is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

In a traditional battery thermal anomaly detection solution, a thermistor with a negative temperature coefficient (NTC) is usually used to measure the temperature inside the battery cell. Therefore, the thermistor can transfer the measured temperature data to the battery management system (BMS), allowing the BMS to regulate the temperature of the battery or battery pack based on the temperature data, and realize the monitoring and protection functions of battery thermal anomalies.

Another traditional solution for battery thermal anomaly detection is to connect a fuse protection component (fuse) in series between the poles and tabs of the battery cell. In a scenario where large current causes thermal anomalies in the battery core, the fuse protection component can be thermally fused to cut off the current loop and ensure the thermal safety of the battery. However, this fuse protection component cannot be applied to scenarios where the battery core is thermally abnormal, such as a short circuit inside the battery core or a fire outside the battery core.

The above two solutions have the following problems in the detection process of battery thermal anomalies:

1. The early warning error of battery core thermal anomalies is large.

Because the winding core pole group inside the battery core is usually a laminated or wound structure. Therefore, the thermal conductivity of the rolled core pole group inside the battery core is quite different in the stacking direction and the vertical direction, causing the temperature inside the battery core to have an obvious three-dimensional size effect. When a thermal abnormality occurs inside the battery core, the initial heat source is usually a point-shaped heat source. The heat generated by the initial heat source needs to pass through multiple components (such as the pole group/lugs/pole posts of the battery core) to be transferred to the shell surface of the battery core. As well as different contact surfaces, there is a significant temperature difference between the inside of the battery core and the surface of the battery shell.

Therefore, the temperature probe provided on the surface of the casing of the battery core will not be able to accurately detect the temperature inside the battery core, resulting in the inability to accurately warn of thermal abnormalities of the battery core.

2. The early warning time for battery core thermal anomalies lags behind

When a thermal abnormality occurs in the battery core, the heat generated by the heat source is transferred to the shell surface of the battery core through multiple components and different contact surfaces. There is an obvious time lag in the temperature rise of the resistor shell surface.

3. The number of detection positions in the battery pack is small

Due to the limitation of the number of sampling channels of the BMS, in the battery pack, detection positions cannot be arranged for each battery cell, nor can there be too many detection positions for the same battery cell, resulting in the inability to monitor each battery cell in real time and comprehensively. The temperature state of the battery cannot be quickly responded to the local thermal anomaly of the battery core.

4. Unable to identify whether the battery core is overheating abnormally

If an overheated battery core occurs, its internal structure, diaphragm, material system and electrochemical interface will be irreversibly damaged. However, in the relevant inspection process, the early warning function is set at the level of the battery module or battery, which is separated from the battery itself. As a result, it is impossible to record the battery cells that have overheated abnormally, which is not conducive to the production, transportation, and storage of battery cells. and monitoring and screening in all aspects of use.

In order to solve the above problems, this application provides a battery cell, battery module, battery, electronic equipment, mobile device and energy storage device, which can be used in various power backup scenarios.

Among them, electronic devices can be mobile phones (such as folding screen mobile phones, large screen mobile phones, etc.), tablets, laptops, wearable devices, augmented reality (AR)/virtual reality (VR) devices, super mobile Personal computers (ultra-mobile personal computers, UMPCs), netbooks, personal digital assistants (personal digital assistants, PDAs), smart TVs, smart screens, high-definition TVs, 4K TVs, smart speakers, smart projectors and other equipment, this application applies to electronic There are no restrictions on the specific type of equipment.

The mobile device may be a vehicle-mounted device, such as an electric car, an electric bicycle, etc.

Among them, the energy storage device can be a communication site, a data center, an energy storage power station, etc.

For any battery core, the corresponding battery management system uses temperature-sensing devices such as temperature-sensing magnets and dry reed switches, as well as wireless magnetic induction detection response methods to determine whether thermal abnormalities occur in the battery core.

Therefore, the battery management system can adopt corresponding battery over-temperature management strategies. Among them, the battery management system can implement various input signal processing, management decisions and control strategies and other battery over-temperature management strategies, such as thermal safety warning, battery cooling system cooling, battery module main circuit disconnection, etc.

Next, combined with Figure 1, the working principle of the battery management system to implement the battery over-temperature management strategy is introduced in detail.

Please refer to FIG. 1 , which shows a schematic diagram of a battery over-temperature management strategy provided by an embodiment of the present application.

As shown in Figure 1, a temperature-sensitive magnet is used to detect the temperature inside the battery core, that is, the ambient temperature T1 where the temperature-sensitive magnet is located is the temperature TCell inside the battery core. When a thermal abnormality occurs in the battery core, the temperature change of the battery core can trigger the magnetic transition of the temperature-sensitive magnet, and the magnetic transition of the temperature-sensitive magnet can change the conduction state of the dry reed tube. Therefore, after the battery management system detects a change in the conduction state of the dry reed switch, it can determine that a thermal abnormality occurs in the battery core.

Therefore, with the help of temperature-sensing magnets and dry reed tubes, the internal temperature of the battery core when thermal anomalies occur can be accurately detected, and an accurate and timely early warning of thermal anomalies in the battery core can be provided, solving the problem of thermal anomalies in the battery core. The problem of insufficient accuracy of abnormality or lag in warning time improves the response speed of warning for thermal abnormality in the battery cell, which is beneficial to improving the safety protection capability of the battery.

At the same time, based on the layout of the temperature-sensing magnet and the dry reed tube, it is convenient for the temperature-sensing magnet to detect the temperature inside the battery core, and it is convenient for the battery management system to detect whether the conduction state of the dry-type reed tube has changed, and the temperature-sensing magnet The response associated with the dry reed switch does not require a physical wire harness to penetrate the battery case.

Therefore, there is no need to destroy the complete structure of the battery shell, and it will not cause problems such as packaging leakage, which helps to extend the service life of the battery, ensure the reliability and safety of the battery, and is conducive to large-scale mass production and use.

In addition, since the ambient temperature of the temperature-sensitive magnet is higher than the Curie temperature of the temperature-sensitive magnet, the magnetic transition of the temperature-sensitive magnet is irreversible. Therefore, whether the temperature-sensitive magnet has undergone magnetic transformation can be used as a characteristic record of whether the battery core has overheated abnormality. And/or, whether the conduction state of the dry reed switch is changed can be detected. Therefore, whether the conduction state of the dry reed switch changes can also be used as a basis for identifying whether the battery core has overheated abnormality. Therefore, safety risks caused by abnormal overheating of the battery core are avoided.

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

Among them, each dry-type reed switch in the battery cell can use the same type or multiple types of dry-type reed switches, which can be set according to factors such as the number of battery cells in the battery and the requirements of the testing conditions.

For the same battery core, multiple sets of paired temperature-sensing magnets and dry-type reed tubes can also be arranged. The temperature-sensing magnets in each group have different Curie temperatures, and the dry-type reed tubes in each group pass different sampling methods. The channel is electrically connected to the battery management system, so that the battery management system can detect the degree of thermal anomaly and the corresponding temperature of the same battery cell through different sampling channels, which is beneficial to the battery management system to accurately and timely perform different levels of the battery. The safety protection realizes the over-temperature warning function of different levels of the same battery core.

Among them, the same type or multiple types of dry reed switches can be used for each dry reed tube with different Curie temperatures. The specific settings can be set according to factors such as the number of cells in the battery and the requirements of the detection working conditions.

For the battery module, you can choose to use one or more cells as a group. Each group of cells is used as a whole to set up paired temperature sensing magnets and dry reed tubes. The dry reed tube in each group of cells is Electrically connected in series and/or in parallel, and the dry reeds in each group of cells are electrically connected to the battery management system through the same sampling channel, so that the battery management system can measure the group of cells through the same sampling channel. The temperature status of the battery management system is jointly monitored, which eliminates the impact of the battery management system having a small number of detection positions or the temperature-sensing magnets being set in a biased position without detecting whether thermal abnormalities occur in multiple cells, and solving the problem of the limited number of sampling channels in the battery management system. It realizes the over-temperature early warning function for thermal anomalies in multiple cells, improves the early warning response speed, and helps improve the sensitivity and reliability of early warning.

Based on the above description, combined with specific embodiments, the specific implementation methods of the battery cells, battery modules, and batteries of the present application will be described in detail.

Please refer to FIG. 2 , which shows a schematic structural diagram of a battery provided by an embodiment of the present application.

As shown in FIG. 2 , the battery 1 of the present application may include: a battery management system 20 and a battery module 10 .

In FIG. 2 , the battery 1 may include: a battery management system 20 and one or more battery modules 10 . Among them, one battery management system 20 corresponds to each battery module 10 . For ease of explanation, in FIG. 2 , one battery module 10 is taken as an example.

In addition, the battery 1 may also include one or more paired battery management systems 20 and battery modules 10 . The paired battery management system 20 in each group corresponds to the battery module 10 one-to-one.

Among them, this application does not limit the specific implementation of the battery management system 20 and the battery cell 100 .

Any battery module 10 of the present application may include one or more battery cells 100 . For ease of explanation, in FIG. 2 , two battery cells 100 are taken as an example. When the battery module 10 includes multiple battery cells 100, the multiple battery cells 100 may be electrically connected in series and/or in parallel. It should be understood that multiple battery cells 100 electrically connected in series can increase the capacity of the battery 1 . Multiple battery cells 100 electrically connected in parallel can increase the voltage of the battery 1 . Multiple battery cells 100 electrically connected in series and parallel can increase the capacity and voltage of the battery 1 .

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

Please refer to FIG. 3 , which shows a partial structural diagram of a battery provided by an embodiment of the present application.

As shown in FIG. 3 , the battery core 100 of the present application may include: a bare battery core 101 , an electrolyte 107 , a battery core housing 102 , a first temperature-sensitive magnet 103 , and a first dry reed tube 104 . The battery management system 20 of the present application may include: a detection module 201 and a host unit 202.

Please refer to FIG. 4 , which shows a schematic flowchart of a battery thermal abnormality early warning method provided by an embodiment of the present application. Based on the battery 1 shown in Figures 2 and 3, as shown in Figure 4, the battery thermal abnormality early warning method of the present application may include:

S101. The first temperature-sensing magnet senses the temperature inside the battery core; if the temperature inside the battery 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 first temperature-sensing magnet disappears. The Curie temperature of the thermomagnet matches the thermal runaway critical temperature of the battery core.

S102. After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed tube changes.

S103. After detecting a change in the conduction state of the first dry reed switch, the battery management system determines that a thermal abnormality occurs in the battery core.

Based on the above description, the specific implementation methods of each module in the battery 1 are introduced in turn.

1. Bare battery core 101

The thermal abnormality of the battery core 100 mentioned in this application can be understood as: when the temperature inside the battery core 100 may be too high, the battery core 100 is about to undergo thermal runaway or the battery core 100 has already experienced thermal runaway.

Among them, the bare battery core 101 serves as a component of the battery core 100 . In some embodiments, the bare cell 101 may include: a positive electrode, Negative electrode and separator. The battery cell 100 may be a secondary battery such as a lithium ion battery cell.

Next, with reference to Figure 5, the working principle of the thermal abnormality of the battery core 100 will be introduced in detail.

Please refer to Figure 5. Figure 5 shows a Semenov heat temperature diagram provided by an embodiment of the present application.

For ease of explanation, in Figure 5, the abscissa represents temperature (temperature) T, and the ordinate represents rate (rate) q, without units.

As shown in Figure 5, the solid line 1 can represent the relationship between the heat generation rate qG of the battery core 100 and the temperature TCell inside the battery core 100. The dotted line 2 can represent the relationship between the heat dissipation rate qL of the battery core 100 and the temperature inside the battery core 100. The relationship between the temperature TCell.

Among them, the heat generation rate qG of the battery core 100 is an exponential function of temperature and follows the Arrhenius equation. Therefore, the relationship between the heat generation rate qG of the battery core 100 and the temperature TCell inside the battery core 100 can be expressed by Formula 1:

Among them, the heat dissipation rate qL of the battery core 100 is a linear function of temperature and follows Newton's cooling law. Therefore, the relationship between the heat dissipation rate qL of the battery core 100 and the temperature TCell inside the battery core 100 can be expressed by Formula 2:
q _L =US(TT ₀ ) Formula 2.

Based on Formula 1 and Formula 2, the temperature TCell inside the battery core 100 depends on: the balance between the heat generation rate qG of the battery core 100 and the heat dissipation rate qL of the battery core 100 . It can be seen that when the heat generation rate qG of the battery core 100 is greater than the heat dissipation rate qL of the battery core 100, the temperature TCell inside the battery core 100 is greater than the thermal runaway critical temperature (or non-return temperature) TNR of the battery core 100. Heat buildup in the core 100 can cause spontaneous combustion or explosion. Among them, the thermal runaway critical temperature TNR of the battery core 100 is greater than the maximum temperature value of the battery core 100 during normal operation.

In summary, before the internal temperature TCell of the battery core 100 is greater than the thermal runaway critical temperature TNR of the battery core 100, it is necessary to provide an early warning for thermal anomalies in the battery core 100 and start a cooling plan for the battery core 100, which will help protect the battery core 100. Safe to use. After the internal temperature TCell of the battery core 100 is greater than the thermal runaway critical temperature TNR of the battery core 100, a safety response plan needs to be initiated promptly to help reduce personal injuries and equipment damage caused by spontaneous combustion or explosion of the battery core 100.

2. Battery core housing 102 and electrolyte 107

The battery case 102 is made of non-magnetic shielding material. It can be seen that the battery core housing 102 does not generate magnetic shielding, that is, the battery core housing 102 does not shield the electromagnetic induction effect. Therefore, the magnetic flux lines generated by the first temperature-sensitive magnet 103 can pass through the battery case 102, so that the space where the first dry reed tube 104 is located can be placed in the magnetic field.

Among them, this application does not limit the specific implementation of the battery case 102. For example, the battery case 102 may be made of aluminum, aluminum-plastic, glass, ceramics, plastic, non-magnetic steel, or other materials.

The cell housing 102 has a receiving cavity. Electrolyte 107 is injected into the accommodation cavity. Therefore, the bare battery core 101 can be placed in the accommodation cavity, so that the electrolyte 107 can fully wet the bare battery core 101 . And the first temperature-sensing magnet 103 can be placed inside or outside the accommodation cavity, and the first dry reed tube 104 can be placed outside the accommodation cavity.

Among them, this application does not limit parameters such as size, quantity, and shape of the accommodation cavity.

Therefore, the arrangement of the battery core casing 102 can protect the battery core 100 and can also separate the first dry reed tube 104 to facilitate the first dry reed tube 104 to detect the temperature of the first temperature sensing magnet 103 The change of the magnetic field also facilitates the electrical connection between the first dry reed tube 104 and the battery management system 20, thereby eliminating the need to penetrate the battery core housing 102 and destroying the structure of the battery core housing 102, thus ensuring the long-term use of the battery core 100. It is beneficial to improve the reliability and safety of the battery cell 100 .

3. The first temperature sensing magnet 103

Temperature-sensitive magnets can also be called temperature-sensitive permanent magnets. Among them, the Curie temperature of the temperature-sensitive magnet refers to the temperature at which the spontaneous magnetization intensity of the magnetic material of the temperature-sensitive magnet drops to zero. It is also the temperature at which the magnetic material undergoes a magnetic transition (ie, from ferromagnetic or ferrimagnetic to paramagnetic). critical point.

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

Next, with reference to Figure 6, the relationship between the magnetic transition of the temperature-sensitive magnet and the Curie temperature of the temperature-sensitive magnet will be introduced in detail.

Please refer to FIG. 6 , which is a schematic diagram showing the relationship between magnetism and temperature of a temperature-sensitive magnet provided by an embodiment of the present application. In Figure 6, each irregular figure represents a magnetic domain in the temperature-sensitive magnet, and the direction of the arrow in each irregular figure represents the magnetic field of the magnetic domain. Moment orientation.

As shown in Figure 6, near the Curie temperature Tc, the magnetism of the temperature-sensitive magnet changes as the temperature rises. Among them, the material of the temperature-sensitive magnet mentioned in this application is not limited. Generally, temperature-sensing magnets can be selected with characteristic chemical composition, crystal structure, doping element type and doping concentration, so as to have different Curie temperatures and realize the over-temperature warning function of the battery core 100 .

For example, the temperature-sensitive magnet can be a neodymium magnet (NdFeB) system or a samarium cobalt (SmCo) system. In addition, the temperature-sensitive magnet can also use a ferrite permanent magnet probe (Curie temperature Tc = 65°C).

When the ambient temperature T1 where the temperature-sensitive magnet is located is lower than the Curie temperature Tc of the temperature-sensitive magnet, the magnetic moments of the magnetic domains in the temperature-sensitive magnet are arranged in an orderly manner, and the orientation of the magnetic moments of the magnetic domains is parallel, that is, as shown in Figure 6 The directions of the arrows in all the irregular patterns shown are parallel, which can produce spontaneous magnetization. Therefore, temperature-sensitive magnets have strong permanent magnetism (such as ferromagnetism or ferrimagnetism).

As the ambient temperature of the temperature-sensitive magnet continues to rise, when the ambient temperature T1 of the temperature-sensitive magnet is greater than the Curie temperature Tc of the temperature-sensitive magnet, the magnetic domains in the temperature-sensitive magnet undergo dramatic thermal changes, resulting in the arrangement of the magnetic moments. It is chaotic and disordered, and the orientation of the magnetic moments of the magnetic domains is disordered, that is, the directions of the arrows in all the irregular patterns shown in Figure 6 are disordered, and the magnetism can cancel each other out. Therefore, the temperature-sensitive magnet becomes paramagnetic, and the magnetism of the temperature-sensitive magnet rapidly weakens until it disappears, that is, the magnetism changes from strong to weak) or from existence to non-existence.

It can be seen that the selection specification of the Curie temperature of the first temperature-sensing magnet 103 can be selected based on the internal temperature of the battery core 100 when a thermal abnormality occurs (that is, the thermal runaway critical temperature TNR of the battery core 100), so that the first temperature-sensing magnet The Curie temperature of 103 matches the thermal runaway critical temperature TNR of the battery core 100. It can be understood that the difference between the Curie temperature of the first temperature sensing magnet 103 and the thermal runaway critical temperature TNR of the battery core 100 is at the first preset value. Within the range, it can be considered that the Curie temperature matches the thermal runaway critical temperature TNR of the battery core 100.

Among them, this application does not limit the specific numerical value of the first preset range.

For example, if the thermal runaway critical temperature TNR of the battery core 100 is 100°C, the first temperature-sensing magnet 103 can be selected from magnets with a Curie temperature within a range. For example, it can be selected when the Curie temperature is greater than 80°C and less than 80°C. Choose from magnets within the 120°C range.

Furthermore, the Curie temperature of the first temperature-sensitive magnet 103 is positively correlated with the temperature inside the battery core 100 . Therefore, the temperature change of the battery core 100 can trigger the magnetic transition of the first temperature-sensitive magnet 103, so that the magnetic transition of the first temperature-sensitive magnet 103 can accurately reflect the internal temperature of the battery core 100 when thermal abnormality occurs.

In addition, this application does not limit the specific value of the Curie temperature of the first temperature-sensitive magnet 103. For example, the Curie temperature of the first temperature-sensitive magnet 103 ranges from 60°C to 300°C.

Among them, this application does not limit the specific position of the first temperature-sensitive magnet 103.

Please refer to Figures 7-8. Figures 7-8 show a schematic structural diagram of a battery core provided by an embodiment of the present application.

As shown in Figure 7, the first temperature-sensitive magnet 103 is placed in the accommodation cavity. Among them, the first temperature-sensitive magnet 103 can be fixed on the inner surface of the battery core case 102 (this method is used for illustration in FIG. 7 ).

Therefore, the first temperature-sensing magnet 103 is closer to the battery core 100, so that the first temperature-sensing magnet 103 can more accurately detect the temperature inside the battery core 100, and also allows the battery core shell 102 to connect the first temperature-sensing magnet 103 and the first dryer. The reed tube 104 is separated, making full use of the internal space of the battery core 100 without destroying the complete structure of the battery core shell 102.

As shown in Figure 8, the first temperature-sensitive magnet 103 is placed outside the accommodation cavity. Among them, the first temperature-sensitive magnet 103 can be fixed on the outer surface of the battery core case 102 (this method is used for illustration in FIG. 8 ). Alternatively, the first temperature-sensitive magnet 103 can be fixed outside the battery core case 102, that is, the first temperature-sensitive magnet 103 can not be in contact with the surface of the battery core shell 102, so as to facilitate the separation of the first temperature-sensitive magnet 103 and the battery core shell. Body 102.

When the first temperature-sensing magnet 103 is fixed outside the battery core casing 102, the first temperature-sensing magnet 103 is relatively close to the battery core casing 102, which ensures that the first temperature-sensing magnet 103 can pass through the battery core 100 and sense The heat generated by the battery core 100 is detected, so that the magnetism of the first temperature-sensing magnet 103 can reflect the temperature change of the battery core 100 . The distance between the first temperature-sensitive magnet 103 and the battery core housing 102 is set to a smaller range, and this application does not limit its specific value.

When the first temperature-sensitive magnet 103 is fixed outside the battery core housing 102, the battery core 100 may further include: a thermal conductive member. Among them, the thermally conductive parts can be made of thermally conductive glue or thermally conductive silicone grease, which is not limited in this application. Furthermore, the thermal conductive member can help the first temperature-sensitive magnet 103 accurately reflect the temperature change of the battery core 100 .

Therefore, the first temperature-sensing magnet 103 can be flexibly arranged, fully taking into account the limited internal space of the battery core 100, and also realizing the separate arrangement of the first temperature-sensing magnet 103 and the first dry reed tube 104 without damaging it. The complete structure of the cell housing 102.

Among them, the first temperature-sensing magnet 103 can be fixedly arranged in the battery core 100 by welding, inlaying or gluing to ensure that the first temperature-sensing magnet 103 will not move as the battery core 100 shakes. In addition, the first temperature sensing magnet 103 can be fixed by means of the battery core 100/battery management system 20.

In summary, based on the match between the Curie temperature of the first temperature-sensitive magnet 103 and the thermal runaway critical temperature TNR of the battery core 100 , the temperature change of the battery core 100 can trigger a magnetic transition of the first temperature-sensitive magnet 103 . That is to say, when the temperature inside the battery core 100 does not exceed the thermal runaway critical temperature TNR of the battery core 100 , no thermal abnormality occurs in the battery core 100 , and the first temperature-sensitive magnet 103 has strong magnetism. When the temperature inside the battery core 100 does not exceed the thermal runaway critical temperature TNR of the battery core 100 , thermal abnormality occurs in the battery core 100 , and the magnetism of the first temperature-sensitive magnet 103 may gradually weaken until it disappears.

In addition, the present application can set a first preset temperature. The first preset temperature 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 the electric current. A thermal abnormality occurs in core 100.

Among them, 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-sensitive magnet 103, which is helpful for accurately detecting the internal temperature of the battery core 100 when thermal anomalies occur. Alternatively, the first preset temperature may be higher than the Curie temperature of the first temperature-sensitive magnet 103, taking into full consideration the certain endurance of the battery core 100 and the temperature deviation of related components due to the manufacturing process.

4. The first dry reed pipe 104

Dry reed tube, also known as reed tube or reed tube or magnetron. The dry reed switch is a passive line switching device that can utilize magnetic fields. It has the advantages of simple structure, small size, and easy control.

In this application, the first dry reed tube 104 may be disposed outside the accommodation cavity. Therefore, the first dry reed tube 104 and the first temperature-sensing magnet 103 are separated and arranged without destroying the complete structure of the cell housing 102 .

In some embodiments, as shown in FIG. 7 , the first dry reed 104 may be fixed on the outer surface of the cell housing 102 . Alternatively, as shown in FIG. 8 , the first dry reed 104 may be fixed outside the battery case 102 , that is, the first dry reed 104 may not be in contact with the surface of the battery case 102 .

It should be noted that when the first dry reed tube 104 and the first temperature-sensing magnet 103 are both fixed outside the battery core case 102, the first dry-type reed tube 104 and the first temperature-sensing magnet 103 are also fixed. It can be integrated and does not need to destroy the complete structure of the cell housing 102 .

Among them, the first dry reed 104 can be fixed in the battery core 100 by methods such as bracketing, welding, inlaying or gluing to ensure that the first dry reed 104 will not shake with the battery core 100 And movement occurs. In addition, the first dry reed switch 104 can be fixed by the battery case 102/battery management system 20.

The first dry reed tube 104 can cooperate with the first temperature sensing magnet 103 . The space where the first dry reed 104 is located can be placed in the magnetic field generated by the first temperature-sensitive magnet 103, so that the first dry reed 104 can detect the magnetism of the first temperature-sensitive magnet 103. After the magnetism of the first temperature-sensitive magnet 103 gradually weakens until it disappears, the magnetic induction intensity of the first temperature-sensitive magnet 103 will irreversibly decrease until it disappears, and the magnetic field in the space where the first dry reed tube 104 is located decreases until it disappears. Therefore, after the magnetism of the first temperature-sensitive magnet 103 disappears, the conductive state of the first dry reed 104 will change.

The first dry reed 104 is also electrically connected to a sampling channel (sampling channel 1 is used for illustration in FIG. 3 ) of the detection module 201 . Among them, the sampling channel 1 of the detection module 201 may include one or more terminals. Based on the foregoing electrical connection relationship, the detection module 201 can detect in real time whether the conduction state of the first dry reed 104 changes.

Therefore, after detecting that the conduction state of the first dry reed 104 changes, the detection module 201 can send the detection result to the host unit 202 . After receiving the detection result, the host unit 202 may determine that the battery core 100 generates abnormal heat.

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

Below, the working principles of the three types of dry reed tubes are introduced in detail with reference to Figures 9, 10, 11, and 12A-12B.

For convenience of explanation, in each figure, the first temperature-sensitive magnet 103 is fixed on the inner surface of the battery core 100, the first dry reed tube 104 is fixed on the outer surface of the battery core 100, and the first temperature-sensitive magnet 103 includes a south pole. There are two magnetic poles (S) and North Pole (N). The dotted lines represent the magnetic field lines generated by the corresponding temperature-sensitive magnets as an example.

Please refer to Figures 9-10. Figure 9 shows a partial structural diagram of a battery provided by an embodiment of the present application. Figure 10 shows a normally open dry reed switch provided by an embodiment of the present application. Schematic diagram of the working principle.

As shown in Figures 9 and 10, the first dry reed tube 104 is a normally open dry reed tube, that is, an A-type dry reed tube.

Among them, the normally open dry reed tube includes two terminals, namely a first end P1 and a second end P2.

When there is a magnetic field in the space where the normally open dry reed tube is located, the reed inside the normally open dry reed tube is closed, and the first end P1 and the second end P2 of the normally open dry reed tube are connected. At this time, the conduction state of the normally open dry reed tube is a low impedance conduction state.

When the magnetic field in the space where the normally-open dry-type reed tube is located disappears (that is, there is no magnetic field), the reed inside the normally-open dry-type reed tube is disconnected, and the first end P1 and the second end of the normally-open dry-type reed tube The two terminals P2 are disconnected. At this time, the conduction state of the normally open dry reed tube is a high impedance non-conduction state.

The number of the first dry reed tubes 104 may be one or more normally open dry reed tubes.

When the number of the first dry reed tube 104 is one normally open dry reed tube, the two ends (the first end P1 and the second end P2) of the normally open dry reed tube are in contact with the detection module 201 The sampling channels 1 are electrically connected in series. When the number of the first dry reeds 104 is a plurality of normally open dry reeds, the plurality of normally open dry reeds are electrically connected in series, and the plurality of normally open dry reeds connected in series The two ends (first end P1 and second end P2) of the tube are electrically connected in series with the sampling channel 1 of the detection module 201.

The sampling channel 1 of the detection module 201 may include: the first end 1 and the second end 2 of the detection module 201 . The first terminal P1 is electrically connected to the first terminal 1 of the detection module 201 , and the second terminal P2 is electrically connected to the second terminal 2 of the detection module 201 .

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

Therefore, after detecting that the conduction state of the first dry reed 104 changes from a low-impedance conduction state to a high-impedance non-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 a thermal abnormality occurs in the battery core 100 .

It should be noted that when the battery cell 100 is under normal operating conditions, the normally open dry reed switch and the battery management system 20 are connected, that is, the loop formed by the two is connected. Therefore, the normally open dry reed can have a self-checking function, which can rule out the failure of the normally open dry reed to have a conductive state due to poor connection or disconnection of the normally open dry reed itself. The phenomenon of change. When the battery core 100 is in a thermal abnormal condition, the conduction state of the normally open dry reed switch may change, so that the battery management system 20 can determine that the battery core 100 has a thermal abnormality.

Please refer to FIG. 11 , which is a schematic diagram of the working principle of a normally closed dry reed provided by an embodiment of the present application.

As shown in Figures 9 and 11, the first dry reed 104 is a normally closed dry reed, that is, a B-type dry reed.

Among them, the normally closed dry reed tube includes two terminals, namely a first end P1 and a second end P2.

When there is a magnetic field in the space where the normally closed dry reed tube is located, the reed inside the normally closed dry reed tube is disconnected, and the first end P1 and the second end P2 of the normally closed dry reed tube are disconnected. At this time, the conduction state of the normally closed dry reed tube is a high impedance non-conduction state.

When the magnetic field in the space where the normally closed dry-type reed tube is located disappears (that is, there is no magnetic field), the reed inside the normally-closed dry-type reed tube closes, and the first end P1 and the second end of the normally-closed dry-type reed tube The two terminals P2 are conductive. At this time, the conduction state of the normally closed dry-type reed tube is a low-impedance conduction state.

The number of the first dry reed tubes 104 may be one or more normally closed dry reed tubes.

When the number of the first dry-type reed tube 104 is one normally-closed dry-type reed tube, the two ends (the first end P1 and the second end P2) of a normally-open type dry-type reed tube are in contact with the detection module 201 The sampling channel 1 is electrically connected in parallel. When the number of the first dry-type reed tubes 104 is a plurality of normally-closed dry-type reed tubes, each normally-closed dry-type reed tube is electrically connected in parallel, and the two normally-closed dry-type reed tubes are electrically connected in parallel. The terminals (the first terminal P1 and the second terminal P2) are both electrically connected in parallel with the sampling channel 1 of the detection module 201 .

The sampling channel 1 of the detection module 201 may include: the first end 1 and the second end 2 of the detection module 201 . The first terminal P1 and the second terminal P2 are electrically connected in parallel with the first terminal 1 and the second terminal 2 of the detection module 201 respectively.

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

Therefore, after detecting that the conduction state of the first dry reed 104 changes from a high-impedance non-conduction 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 a thermal abnormality occurs in the battery core 100 .

It should be noted that when the battery cell 100 is under normal operating conditions, the normally closed dry reed switch and the battery management system 20 are disconnected, that is, the circuit formed by the two is not conductive. Therefore, the normally closed dry reed switch does not cause standby consumption of the power supply of the battery management system 20, is easy to network and wire, and is more sensitive and reliable. When the battery core 100 is in a thermal abnormal condition, the conduction state of the normally closed dry reed switch may change, so that the battery management system 20 can determine that the battery core 100 has a thermal abnormality.

Please refer to Figures 12A and 12B. Figure 12A shows a partial structural diagram of a battery provided by an embodiment of the present application. Figure 12B shows a switching type dry reed provided by an embodiment of the present application. Schematic diagram of working principle.

As shown in FIGS. 12A and 12B , the first dry reed 104 adopts a switching dry reed, that is, a C-type dry reed.

Among them, the switching dry reed tube includes three terminals, namely a first end P2, a second end P1 and a third end P3. A first channel may be formed between the first end P2 and the second end P1, and a second channel may be formed between the first end P2 and the third end P3.

When there is a magnetic field in the space where the switching dry-type reed tube is located, the first end P2 and the second end P1 of the switching dry-type reed tube are connected, and the first end P2 and the third end of the switching dry-type reed tube are connected. Terminal P3 is 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-conduction state.

When the magnetic field in the space where the switching dry-type reed tube is located disappears (that is, there is no magnetic field), the reed inside the switching-type dry-type reed tube switches to the corresponding connection terminal, that is, the first end P2 of the switching-type dry-type reed tube. It is disconnected from the second terminal P1, and the first terminal P2 and the third terminal P3 of the switching dry reed tube are connected. At this time, the conduction state of the first channel is a high-impedance non-conduction state, and the conduction state of the second channel is a low-impedance conduction state.

The number of the first dry reeds 104 may be one or more switching dry reeds.

When the number of the first dry reed 104 is one switching dry reed, the first channel (the first end P2 and the second end P1) of the switching dry reed and the detection module 201 Sampling channel 1 is electrically connected in series. The second channel (the first end P2 and the third end P3) of a switching dry reed switch is electrically connected in parallel with the sampling channel 1 of the detection module 201 .

When the number of the first dry reeds 104 is a plurality of switching dry reeds, the first channels of the plurality of switching dry reeds are electrically connected in series, and the plurality of switching dry reeds connected in series are The two ends (first end P2 and second end P1) of the reed switch are electrically connected in series with the sampling channel 1 of the detection module 201.

Moreover, the second channel of each switching type dry reed tube is electrically connected in parallel, and both ends (the first end P2 and the third end P3) of the second channel of each switching type dry type reed tube are connected to the detection module The sampling channel 1 of the 201 is electrically connected in parallel.

The sampling channel 1 of the detection module 201 may include: the first end 1 , the second end 2 and the third end 3 of the detection module 201 . In the first channel, the first end P2 is electrically connected to the first end 1 of the detection module 201 , and the second end P1 is electrically connected to the second end 2 of the detection module 201 . In the second channel, the first terminal P2 is electrically connected to the first terminal 1 of the detection module 201 , and the third terminal P3 is electrically connected to the third terminal 3 of the detection module 201 .

To sum up, when the first dry reed tube 104 is a switching dry type reed tube, as the magnetism of the first temperature sensing magnet 103 disappears, the conduction state of the first channel can change from the low impedance conduction state to A high-impedance non-conducting state, and the conductive state of the second channel can change from a high-impedance non-conducting state to a low-impedance conducting state.

Therefore, the detection module 201 detects that the conduction state of the first channel changes from a low-impedance conduction state to a high-impedance non-conduction state, and the conduction state of the second channel changes from a high-impedance non-conduction state to a low-impedance conduction state. After entering the communication state, the detection result can be sent to the host unit 202. After receiving the detection result, the host unit 202 can determine that a thermal abnormality occurs in the battery core 100 .

It should be noted that when the battery cell 100 is in normal working condition, the first channel of the switching dry reed switch is connected to the battery management system 20 . Therefore, the switching dry reed can have a self-checking function, which eliminates the phenomenon that the conduction state of the switching dry reed cannot be changed due to poor connection or disconnection of the switching dry reed itself. . When the battery core 100 is in a thermal abnormal condition, the conduction state of the switching dry reed switch can be changed, so that the battery management system 20 can determine that the battery core 100 has a thermal abnormality.

5. Detection module 201 and host unit 202

The detection module 201 is electrically connected to the first dry reed 104. The electrical connection relationship can be referred to the above description. Based on the foregoing electrical connection relationship, the detection module 201 can detect whether the conduction state of the first dry reed 104 changes in real time. The specific implementation method of the foregoing process can be found in the previous description, and will not be described again here.

The detection module 201 is also electrically connected to the host unit 202. Among them, the detection module 201 and the host unit 202 can realize digital signal communication based on, for example, a controller area network bus (controller area network, CAN) protocol. Alternatively, the detection module 201 and the host unit 202 can also communicate with analog signals, such as detecting current, resistance or voltage, etc., by using an ohmmeter, a bridge voltage divider, or a pull-up resistor voltage divider.

Among them, 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 in the host unit 202 . Alternatively, the detection module 201 and the host unit 202 can be provided separately.

In addition, the detection module 201 can reuse the insulation detection module that already exists in the battery 1, or can also be a new insulation detection module in the battery 1. test module. Among them, the insulation detection module can not only detect whether the conduction state of the first dry reed switch 104 changes, but also detect whether there is a ground fault in the battery 1 when the battery 1 is turned on to ensure that the battery 1 can operate safely.

Alternatively, the detection module 201 can also reuse an existing temperature sampling module (such as NTC) in the battery 1, or it can be a newly added temperature sampling module in the battery 1. Among them, in addition to detecting whether the conduction state of the first dry reed switch 104 changes, 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.

Alternatively, the detection module 201 may use the above-mentioned insulation detection module and temperature sampling module.

Based on the above electrical connection relationship, the detection module 201 can send a detection result to the host unit 202 after detecting a change in the conduction state of the first dry reed 104 . When the detection module 201 does not detect a change in the conduction state of the first dry reed tube 104, it can continue to detect whether the conduction state of the first dry reed tube 104 changes.

Among them, this application does not limit the specific implementation method of the detection results.

When the detection result is a digital signal "0/1", the detection module 201 and the host unit 202 can negotiate in advance whether the level of the detection result jumps to indicate whether a thermal abnormality occurs in the battery core 100 . Specifically, if the level of the detection result jumps, it means that the battery core 100 has thermal abnormality; if the level of the detection result does not jump, it means that the battery core 100 does not have thermal abnormality.

Therefore, after detecting that the conduction state of the first dry reed switch 104 changes, the detection module 201 can send the detection result of the level jump to the host unit 202 . After detecting a level jump in the detection result, the host unit 202 may determine that a thermal abnormality occurs in the battery core 100 .

Alternatively, when the detection result is a digital signal “0/1”, the detection module 201 and the host unit 202 may negotiate in advance whether the detection result is sent to indicate whether a thermal abnormality occurs in the battery core 100 . Specifically, if the detection result is sent, it means that thermal abnormality occurs in the battery core 100; if the detection result is not sent, it means that no thermal abnormality occurs in the battery core 100.

Therefore, after detecting that the conduction state of the first dry reed 104 changes, the detection module 201 can send the detection result to the host unit 202 . After receiving the detection result, the host unit 202 may determine that a thermal abnormality occurs in the battery core 100 .

Among them, the level jump of the detection result can be understood as: a jump from high level "1" to low level "0", or from a low level "0" to a high level "1". jump.

When the detection result is an analog signal, the detection module 201 and the host unit 202 can negotiate in advance: if the amplitude change of the voltage of the detection result is less than or equal to the amplitude of the threshold voltage (threshold voltage) Vg, it means that the battery core 100 is overheated. abnormal. If the voltage amplitude change of the detection result is greater than the amplitude of the threshold voltage Vg, it means that no thermal abnormality occurs in the battery core 100 .

The threshold voltage Vg refers to the voltage corresponding to when the battery core 100 has no thermal abnormality and changes to the occurrence of thermal abnormality, and is used to determine whether the magnetism of the first temperature-sensitive magnet 103 disappears. Correspondingly, the threshold voltage Vg is determined based on the Curie temperature of the first temperature-sensitive magnet 103 , the sensing sensitivity of the first dry reed 104 , and the response sensitivities of the detection module 201 and the host unit 202 .

Therefore, after detecting that the conduction state of the first dry reed 104 changes, the detection module 201 can send a detection result that the voltage amplitude is less than or equal to the threshold voltage Vg to the host unit 202 . When the host unit 202 detects that the amplitude of the voltage of the detection result decreases to less than or equal to the amplitude of the threshold voltage Vg, it may determine that a thermal abnormality occurs in the battery core 100 .

Next, with reference to Figures 13 and 14, the specific architecture of the detection module 201 is introduced in detail.

Please refer to Figure 13, which shows a schematic architectural diagram of a detection module provided by an embodiment of the present application. For ease of explanation, in FIG. 13 , the first dry reed 104 adopts the normally open dry reed shown in FIG. 10 as an example.

As shown in Figure 13, the detection module 201 may include an ohmmeter. The first end and the second end of the ohmmeter can be regarded as the sampling channel 1 of the detection module 201, that is, the first end of the ohmmeter is the first end 1 of the detection module 201, and the second end of the ohmmeter is the third end of the detection module 201. Two ends 2.

The first end of the ohmmeter is electrically connected to the first end P1 of the first dry reed tube 104, the second end of the ohmmeter is electrically connected to the second end P2 of the first dry reed tube 104, and the detection module The fourth terminal 4 of 201 is electrically connected to the host unit 202 .

After a thermal abnormality occurs in the battery core 100, the magnetism of the first temperature sensing magnet 103 disappears, the reed inside the first dry reed tube 104 is disconnected, and the first end P1 and the second end of the first dry reed tube 104 P2 is disconnected. At this time, the ohmmeter will detect a high impedance exceeding the preset resistance value, and the detection module 201 can send the detection result to the host unit 202. After receiving the detection result, the host unit 202 may determine that a thermal abnormality occurs in the battery core 100 . Therefore, the host unit 202 can adopt corresponding battery over-temperature management strategies.

Please refer to Figure 14, which shows a schematic architectural diagram of a detection module provided by an embodiment of the present application. For ease of explanation, in FIG. 14 , the first dry reed 104 is exemplified by using the normally closed dry reed shown in FIG. 11 .

As shown in Figure 14, the detection module 201 may include: a low-voltage power supply V1, a resistor R1, a resistor R2, a resistor R3, and a resistor. Block R4. The first end of the resistor R1 and the first end of the low-voltage power supply V1 can be regarded as the sampling channel 1 of the detection module 201, that is, the first end of the resistor R1 is the first end 1 of the detection module 201, and the first end of the low-voltage power supply V1 is The second terminal 2 of the detection module 201. In addition, the second terminal of the resistor R3 is the fifth terminal 5 of the detection module 201 , and the second terminal of the resistor R4 is the sixth terminal 6 of the detection module 201 .

Among them, the first terminal P1 and the second terminal P2 of the first dry reed switch 104 are electrically connected in parallel with the first terminal of the resistor R1 and the first terminal of the low-voltage power supply V1 respectively, and the second terminal of the resistor R1 is connected with the resistor R2 respectively. The first end of the resistor R3 is electrically connected to the first end of the low-voltage power supply V1. The second end of the low-voltage power supply V1 is electrically connected to the second end of the resistor R2 and the first end of the resistor R4 respectively. The second end of the resistor R3 is electrically connected to the host unit 202. The first terminal is electrically connected, and the second terminal of the resistor R4 is electrically connected to the second terminal of the host unit 202 .

The resistance ratio between the resistor R1 and the resistor 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 at both ends of the resistor R2 can meet the access requirements of the host unit 202. The resistance values of resistor R3 and resistor R4 are equal.

After a thermal abnormality occurs in the battery core 100, the magnetism of the first temperature sensing magnet 103 disappears, the reed inside the first dry reed tube 104 is closed, and the first end P1 and the second end of the first dry reed tube 104 P2 is turned on. At this time, a voltage difference may be generated between the fifth terminal 5 and the sixth terminal 6 of the detection module 201, that is, the detection result. After detecting the aforementioned detection result, the host unit 202 may determine that a thermal abnormality occurs in the battery core 100 . Therefore, the host unit 202 can adopt corresponding battery over-temperature management strategies for the battery core 100 .

It should be noted that the detection module 201 of this application includes but is not limited to the implementation shown in Figures 13 and 14.

In summary, when a thermal abnormality occurs in the battery core 100 , the magnetism of the first temperature-sensitive magnet 103 disappears, causing the conduction state of the first dry reed switch 104 to change. Therefore, after detecting that the conduction state of the first dry reed switch 104 changes, the battery management system 20 can determine that a thermal abnormality occurs in the battery core 100 .

The battery core, the battery module including the battery core, the battery including the battery module, and the settings and devices including the battery provided by this application are based on the first temperature sensing magnet and the third temperature sensing magnet through the detection response method of wireless magnetic induction. The combination of a dry reed tube can accurately detect the internal temperature of the battery core when thermal abnormality occurs, and can provide accurate and timely early warning of thermal abnormality of the battery core, solving the problem of early warning response for thermal abnormality of the battery core. The problem of lag or inaccuracy improves the response speed for early warning of thermal anomalies in the battery cells, which is beneficial to improving the safety protection capabilities of the battery. At the same time, based on the layout of the first temperature-sensing magnet and the first dry reed tube, there is no need to destroy the complete structure of the battery shell, and will not cause problems such as packaging leakage, which helps to extend the service life of the battery and ensure the battery life. The reliability and safety are conducive to large-scale mass production and use.

In addition, this application can also record: whether the first temperature-sensitive magnet has undergone a magnetic transition, and/or whether the conduction state of the first dry reed tube has changed. The above situation can be used to identify whether the battery core has overheated abnormality. Based on this, the safety risks caused by abnormal overheating of the battery core are avoided.

Based on the description of the above embodiments, for the same battery core 100, multiple pairs of temperature-sensing magnets and dry reed tubes, such as two groups, three groups, or four groups, can also be arranged. The temperatures inside are different, and the dry reeds in each group 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 there are different degrees of thermal abnormalities. Realize the over-temperature warning function of 100 different levels of battery cells.

Below, the battery 1 corresponding to the above content is introduced in detail. For the convenience of explanation, this application uses two paired sets of temperature-sensing magnets and dry reed tubes for illustration.

Please refer to FIG. 15 , which shows a partial structural diagram of a battery provided by an embodiment of the present application.

As shown in Figure 15, for the same battery core 100, based on the structure shown in Figure 4, the battery core 100 of the present application can further include: a second temperature-sensing magnet 105 and a second dry tongue reed. tube 106.

Please refer to FIG. 16 , which is a schematic flowchart of a battery thermal abnormality early warning method provided by an embodiment of the present application. Based on the battery 1 shown in Figure 15, as shown in Figure 16, the battery thermal abnormality early warning method of this application may include:

S201. The first temperature-sensing magnet senses the temperature inside the battery core; if the temperature inside the battery 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 first temperature-sensing magnet disappears. The Curie temperature of the thermomagnet matches the thermal runaway critical temperature of the battery core.

S202. After the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed tube changes.

S203. After detecting that the conduction state of the first dry reed switch has changed, the battery management system determines that the first degree of thermal abnormality occurs in the battery core. For example, the battery management system can perform first-level safety warnings, such as informing relevant personnel.

S204. The second temperature-sensing magnet senses the temperature inside the battery core; if the temperature inside the battery core 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 second temperature-sensing magnet disappears. Curie temperature of thermomagnet and thermal runaway critical temperature of battery core match.

S205. After the magnetism of the second temperature-sensitive magnet disappears, the conduction state of the second dry reed tube changes.

S206. After detecting a change in the conduction state of the second dry reed, the battery management system determines that the battery core has a second degree of thermal abnormality, and the second degree is different from the first degree. For example, the battery management system can perform secondary safety warnings, such as stopping the operation of the battery cells.

The second temperature-sensing magnet 105 may be placed inside the accommodation cavity, or the second temperature-sensing magnet 105 may be located outside the accommodation cavity. The specific position of the second temperature-sensing magnet 105 is not limited in this application. For its specific implementation, please refer to the description of the specific position of the first temperature-sensing magnet 103 shown in Figures 7-8, which will not be described again here.

Therefore, it is ensured that the magnetic flux lines generated by the second temperature-sensitive magnet 105 can pass through the battery housing 102, so that the space where the second dry reed tube 106 is located can be placed in the magnetic field.

The Curie temperature of the second temperature-sensing magnet 105 is different from the Curie temperature of the first temperature-sensing magnet 103 , so that the first temperature-sensing magnet 103 and the second temperature-sensing magnet 105 can detect different degrees of heat generated in the battery core 100 respectively. The internal temperature during abnormality is helpful to reflect the degree of thermal abnormality of the battery core 100 and realize multi-level early warning of different degrees of thermal abnormality of the battery core 100 .

Based on the description of the embodiment of FIG. 6 , the selection specification of the Curie temperature of the second temperature-sensitive magnet 105 can be selected based on the internal temperature of the battery core 100 when a thermal abnormality occurs (that is, the thermal runaway critical temperature TNR of the battery core 100 ). The Curie temperature of the second temperature-sensing magnet 105 is matched with the thermal runaway critical temperature TNR of the battery core 100. It can be understood that the difference between the Curie temperature and the thermal runaway critical temperature TNR of the battery core 100 is within the second preset range. It can be considered that the Curie temperature matches the thermal runaway critical temperature TNR of the battery core 100.

Among them, this application does not limit the specific numerical 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.

Furthermore, the Curie temperature of the second temperature-sensitive magnet 105 is positively correlated with the temperature inside the battery core 100 . Therefore, the temperature change of the battery core 100 can trigger the magnetic transition of the second temperature-sensitive magnet 105, so that the magnetic transition of the second temperature-sensitive magnet 105 can accurately reflect the internal temperature of the battery core 100 when thermal abnormality occurs.

Therefore, based on the match between the Curie temperature of the second temperature-sensitive magnet 105 and the thermal runaway critical temperature TNR of the battery core 100 , the temperature change of the battery core 100 can trigger a magnetic transition of the second temperature-sensitive magnet 105 . That is to say, when no thermal abnormality occurs in the battery core 100, the second temperature-sensitive magnet 105 has strong magnetism. When a thermal abnormality occurs in the battery core 100, the magnetism of the second temperature-sensitive magnet 105 may gradually weaken until it disappears.

Considering that the Curie temperature of the first temperature-sensing magnet 103 may be set relatively close to the thermal runaway critical temperature TNR of the battery core 100 , it may appear that the battery core 100 has actually experienced thermal abnormality, but the battery management system 20 has not performed any Early warning situation.

Based on the above content, the present application can set the Curie temperature of the second temperature-sensing magnet 105 to be less than the Curie temperature of the first temperature-sensing magnet 103 , and the Curie temperature of the first temperature-sensing magnet 103 to be less than the thermal runaway critical temperature TNR of the battery core 100 , the thermal runaway critical temperature TNR of the battery core 100 is greater than the maximum temperature value of the battery core 100 during normal operation.

As the temperature inside the battery core 100 increases, the magnetism of the second temperature-sensitive magnet 105 first changes. As the temperature inside the battery core 100 continues to rise, the magnetism of the first temperature-sensitive magnet 103 changes again. It should be noted that at this time, the magnetism of the second temperature-sensitive magnet 105 will not change again.

Therefore, thermal anomalies in the battery core 100 can be quickly sensed through the arrangement of the second temperature-sensing magnet 105, thus avoiding the problem of insufficient timely warning due to an excessively high Curie temperature setting of a single temperature-sensing magnet.

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

Considering that the Curie temperature of the first temperature-sensing magnet 103 may also be set much smaller than the thermal runaway critical temperature TNR of the battery core 100 , it may occur that the battery core 100 has not actually experienced thermal abnormality, and the battery management system 20 A warning has been issued.

Based on the above content, 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 TNR of the battery core 100. , the thermal runaway critical temperature TNR of the battery core 100 is greater than the maximum temperature value of the battery core 100 during normal operation.

As the temperature inside the battery core 100 increases, the magnetism of the first temperature-sensitive magnet 103 first changes. As the temperature inside the battery core 100 continues to rise, the magnetism of the second temperature-sensitive magnet 105 changes again. It should be noted that at this time, the magnetism of the first temperature-sensitive magnet 103 will not change again.

Therefore, thermal anomalies in the battery core 100 can be accurately detected through the arrangement of the second temperature-sensitive magnet 105, and the problem of too frequent warnings caused by the Curie temperature of a single temperature-sensitive magnet being set too low is avoided.

It should be noted that in Figure 16, the execution order of each step is: S201-S202-S203-S204-S205-S206. For convenience of explanation, this application adopts the foregoing order for illustration.

The second dry reed tube 106 can be placed outside the receiving chamber. Among them, this application does not limit the specific position of the second dry reed 106. For its specific implementation, please refer to the description of the specific position of the first dry reed 104 shown in Figures 7-8. Here No further details will be given.

In addition, the first dry reed 104 and the second dry reed 106 may use the same type of dry reed, or may use different types of dry reed, which is not limited in this application.

Among them, this application does not limit the specific type, quantity and working principle of the second dry reed tube 106. For its specific implementation, please refer to the description of the first dry reed tube 104 shown in Figures 9 to 12B. No further details will be given here.

It should be noted that the conductive state of the second dry reed tube 106 has nothing to do with the magnetic transition of the first temperature-sensitive magnet 103, and the conductive state of the first dry-type reed tube 104 has nothing to do with the magnetic transition of the second temperature-sensitive magnet 105. Magnetic transitions are irrelevant.

That is to say, a magnetic shield is formed between the first temperature-sensing magnet 103 and the first dry-type reed tube 104, and the second temperature-sensing magnet 105 and the second dry-type reed tube 106. The second temperature-sensing magnet 105 The magnetic transition cannot cause the conduction state of the first dry reed tube 104 to change, and the magnetic transition of the first temperature-sensitive magnet 103 cannot cause the conduction state of the second dry reed tube 106 to change.

Among them, for the paired temperature-sensitive magnets and dry-type reed tubes, this application can adopt methods such as increasing the distance and/or adding magnetic shields to ensure that the temperature-sensitive magnets in any group will not affect the dry-type reed tubes in other groups. Reed tubes cause magnetic interference.

In some embodiments, the distance between the first temperature-sensing magnet 103 and the second temperature-sensing magnet 105 is greater than the preset distance 1, and the distance between the first dry-type reed tube 104 and the second dry-type reed tube 106 The distance is greater than the preset distance 2. Among them, this application does not limit the specific values of the preset distance 1 and the preset distance 2.

In other embodiments, considering that the space size of the battery core 100 is limited, the first temperature-sensing magnet 103 can be placed in the magnetic shield 1 with an opening to adjust the position of the first temperature-sensing magnet 103 in the corresponding first dry type. The direction of the magnetic field applied to the reed tube 104 can ensure that the first temperature-sensitive magnet 103 becomes an oriented magnet that generates a magnetic field in the same direction. The second temperature-sensing magnet 105 can be placed in the magnetic shield 2 with an opening to adjust the direction of the magnetic field exerted by the second temperature-sensing magnet 105 on the corresponding second dry reed tube 106 to ensure the second temperature-sensing The magnet 105 becomes an oriented magnet that generates a magnetic field in the same direction. Among them, this application does not limit parameters such as quantity, layout, size, etc. of the magnetic shielding members 1 and 2.

The second dry reed 106 and the first dry reed 104 are respectively electrically connected to different sampling channels of the battery management system 20 . That is to say, in Figure 15, the first dry reed 104 is electrically connected to the sampling channel 1 of the detection module 201, the second dry reed 106 is electrically connected to the sampling channel 2 of the detection module 201, and the detection module 201 Sampling channel 1 and sampling channel 2 of the detection module 201 are different. Among them, the sampling channel 2 of the detection module 201 may include one or more terminals.

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 tube 104 and the conduction state of the second dry reed tube 106 change.

Therefore, after detecting that the conduction state of the first dry reed 104 changes, the detection module 201 can send the first detection result to the host unit 202 . After receiving the first detection result, the host unit 202 can determine that the battery core 100 has a first degree of thermal abnormality. After detecting that the conduction state of the second dry reed 106 changes, the detection module 201 may send a second detection result to the host unit 202 . After receiving the second detection result, the host unit 202 can determine that a second degree of thermal abnormality occurs in the battery core 100 .

For specific implementation methods of the first detection result and the second detection result, please refer to the aforementioned detection results.

The first detection result and the second detection result have different meanings. The first detection result is used to indicate that the battery core 100 has a first degree of thermal abnormality. The first degree refers to the temperature inside the battery core 100 being equal to or higher than the Curie temperature of the first temperature-sensitive magnet 103 . The second detection result is used to indicate that the battery core 100 has a second degree of thermal abnormality. The second degree refers to that the temperature inside the battery core 100 is equal to or higher than the Curie temperature of the second temperature-sensitive magnet 105 .

The specific implementation method of changing the conduction state of the second dry reed switch 106 can be found in the description of the change of the conduction state of the first dry reed switch 104 in FIGS. 9-12B, and will not be described in detail here. .

It should be noted that for the same battery core 100, two sets of paired temperature-sensing magnets and dry reed tubes can be arranged but are not limited to them. It only needs to be ensured that the Curie temperatures of the temperature-sensing magnets in each group are different. And the dry reed tubes in each group are electrically connected to the battery management system 20 through different sampling channels. For example, the battery core 100 may also be equipped with three or four pairs of paired temperature-sensing magnets and dry reed tubes.

Below, the working principle of realizing the over-temperature warning function of different levels of battery core 100 is introduced in detail.

It is assumed that the first dry reed 104 and the second dry reed 106 adopt the normally open dry reed shown in FIG. 10 .

When there is a magnetic field in the space where the first dry reed 104 and the second dry reed 106 are located, the reed inside the first dry reed 104 is closed, and the first reed of the first dry reed 104 The terminal P1 and the second terminal P2 are connected. At this time, the conduction state of the first dry reed switch 104 is a low-impedance conduction state. The reed inside the second dry reed tube 106 is closed, and the first end P3 and the second end P4 of the second dry reed tube 106 are connected. At this time, the conduction state of the second dry reed switch 106 is a low-impedance conduction state.

When the magnetic field in the space where the first dry reed 104 is located disappears (that is, there is no magnetic field), the reed inside the first dry reed 104 is disconnected, and the first end P1 of the first dry reed 104 and the The two terminals P2 are disconnected. At this time, the conduction state of the first dry reed switch 104 is a high-impedance non-conduction state.

When the magnetic field in the space where the second dry reed 106 is located disappears (that is, there is no magnetic field), the reed inside the second dry reed 106 is disconnected, and the first end P3 of the second dry reed 106 and the second end P3 of the second dry reed 106 are disconnected. The two terminals P4 are disconnected. At this time, the conduction state of the second dry reed switch 106 is a high-impedance non-conduction state.

In summary, as the magnetism of the first temperature-sensitive magnet 103 disappears, the conductive state of the first dry reed switch 104 can change from a low-impedance conductive state to a high-impedance non-conductive state.

Therefore, after detecting 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, the battery management system 20 can determine that the first degree of thermal abnormality occurs in the battery core 100 .

As the magnetism of the second temperature-sensitive magnet 105 continues to disappear, the conduction state of the second dry reed tube 106 can change from a low-impedance conduction state to a high-impedance non-conduction state.

Therefore, after detecting 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, the battery management system 20 can determine that a second degree of thermal abnormality occurs in the battery core 100 .

It is assumed that the first dry reed 104 and the second dry reed 106 are normally closed open dry reeds as shown in FIG. 11 .

When there is a magnetic field in the space where the first dry reed tube 104 and the second dry reed tube 106 are located, the reed inside the first dry reed tube 104 is disconnected, and the first dry reed tube 104 The terminal P1 and the second terminal P2 are disconnected. At this time, the conduction state of the first dry reed switch 104 is a high-impedance non-conduction state. The reed inside the second dry reed 106 is disconnected, and the first end P3 and the second end P4 of the second dry reed 106 are disconnected. At this time, the conduction state of the second dry reed switch 106 is a high-impedance non-conduction state.

When the magnetic field in the space where the first dry reed 104 is located disappears (ie, there is no magnetic field), the reed inside the first dry reed 104 is closed, and the first end P1 and the first dry reed 104 The two terminals P2 are conductive. At this time, the conduction state of the first dry reed switch 104 is a low-impedance conduction state.

When the magnetic field in the space where the second dry reed 106 is located disappears (that is, there is no magnetic field), the reed inside the second dry reed 106 is closed, and the first end P3 and the second end P3 of the second dry reed 106 The two terminals P4 are conductive. At this time, the conduction state of the second dry reed switch 106 is a low-impedance conduction state.

In summary, as the magnetism of the first temperature-sensitive magnet 103 disappears, the conductive state of the first dry reed switch 104 can change from a high-impedance non-conductive state to a low-impedance conductive state.

Therefore, after detecting that the conductive state of the first dry reed switch 104 changes from a high-impedance non-conductive state to a low-impedance conductive state, the battery management system 20 can determine that the first degree of thermal abnormality occurs in the battery core 100 .

As the magnetism of the second temperature-sensitive magnet 105 continues to disappear, the conductive state of the second dry reed tube 106 can change from a high-impedance non-conductive state to a low-impedance conductive state.

Therefore, after detecting that the conduction state of the second dry reed switch 106 changes from a high-impedance non-conduction state to a low-impedance conduction state, the battery management system 20 can determine that a second degree of thermal abnormality occurs in the battery core 100 .

It is assumed that the first dry reed 104 and the second dry reed 106 adopt the switching open type dry reed shown in FIGS. 12A and 12B .

When there is a magnetic field in the space where the first dry reed 104 and the second dry reed 106 are located, the reed inside the first dry reed 104 switches to the corresponding connection terminal, that is, the first dry reed The first end P2 and the second end P1 of the tube 104 are connected, and the first end P2 and the third end P3 of the first dry reed tube 104 are disconnected. At this time, the conduction state of the first channel of the first dry reed switch 104 is a low-impedance conduction state, and the conduction state of the second channel of the first dry-type reed switch 104 is a high-impedance non-conduction state.

The reed inside the second dry-type reed tube 106 switches the corresponding connection terminal, that is, the first end P4 and the second end P3 of the second dry-type reed tube 106 are connected, and the third end of the second dry-type reed tube 106 is connected. One end P4 and the third end P5 are disconnected. At this time, the second dry tongue The conductive state of the first channel of the reed switch 106 is a low-impedance conductive state, and the conductive state of the second channel of the second dry reed switch 106 is a high-impedance non-conductive state.

When the magnetic field in the space where the first dry reed 104 is located disappears (that is, there is no magnetic field), the reed inside the first dry reed 104 switches to the corresponding connection terminal, that is, the third terminal of the first dry reed 104 The first end P2 and the second end P1 are disconnected, and the first end P2 and the third end P3 of the first dry reed switch 104 are connected. At this time, the conduction state of the first channel of the first dry reed switch 104 is a high-impedance non-conduction state, and the conduction state of the second channel of the first dry-type reed switch 104 is a low-impedance conduction state.

When the magnetic field in the space where the second dry-type reed tube 106 is located disappears (ie, there is no magnetic field), the reed inside the second dry-type reed tube 106 switches to the corresponding connection terminal, that is, the third terminal of the second dry-type reed tube 106 The first end P4 and the second end P3 are disconnected, and the first end P4 and the third end P5 of the second dry reed switch 106 are connected. At this time, the conduction state of the first channel of the second dry reed switch 106 is a high-impedance non-conduction state, and the conduction state of the second channel of the second dry-type reed switch 106 is a low-impedance conduction state.

In summary, as the magnetism of the first temperature-sensitive magnet 103 disappears, the conduction state of the first channel of the first dry reed tube 104 can change from a low-impedance conduction state to a high-impedance non-conduction state. The conductive state of the second channel of the reed switch 104 can change from a high-impedance non-conductive state to a low-impedance conductive state.

Therefore, when the battery management system 20 detects that the conduction state of the first channel of the first dry-type reed switch 104 changes from a low-impedance conduction state to a high-impedance non-conduction state, and the first dry-type reed switch 104 After the conduction state of the second channel changes from the high-impedance non-conduction state to the low-impedance conduction state, it can be determined that the first degree of thermal abnormality occurs in the battery core 100 .

As the magnetism of the second temperature sensing magnet 105 continues to disappear, the conduction state of the first channel of the second dry reed tube 106 can change from a low impedance conduction state to a high impedance non-conduction state. The conductive state of the second channel of the reed switch 106 can change from a high-impedance non-conductive state to a low-impedance conductive state.

Therefore, when the battery management system 20 detects that the conduction state of the first channel of the second dry-type reed switch 106 changes from a low-impedance conduction state to a high-impedance non-conduction state, and the second dry-type reed switch 106 After the conductive state of the second channel changes from the high-impedance non-conductive state to the low-impedance conductive state, it can be determined that the second degree of thermal abnormality occurs in the battery core 100 .

In this application, the first temperature-sensing magnet 103 and the second temperature-sensing magnet 105 with different Curie temperatures can be arranged on the battery core 100, with the help of the first dry-type reed tube 104 and the second dry-type reed tube 106 respectively. Different sampling channels are electrically connected to the battery management system 20, so that the battery management system 20 can clearly understand the degree of thermal anomalies and corresponding temperatures of the battery cells 100, which is conducive to the battery management system 20 being able to implement different levels of safety for the battery cells 100. The protection also ensures the timeliness and accuracy of thermal anomalies in the battery core 100, avoids the impact of insufficient timely warnings or too frequent warnings, and realizes different levels of over-temperature warning functions for the battery core 100.

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

Considering that the sampling channels of the battery management system 20 are limited, the present application can divide multiple battery cells 100 such as two, three, or four among these battery cells 100 into a group, and all the battery cells 100 in the group can The dry reeds are electrically connected in series and/or in parallel, and all dry reeds can also be electrically connected to the battery management system 20 through the same sampling channel.

Therefore, the battery management system 20 can detect whether there are thermal abnormalities in multiple battery cells 100 through a small number of sampling channels, thereby facilitating common safety protection for multiple battery cells 100 and saving the time of the battery management system 20 . The sampling channels and connection terminals quickly realize the over-temperature warning function of the battery core 100 and solve the problem of a small number of detection positions of the battery core 100 caused by the limited sampling channels of the battery management system 20 .

Among them, all the dry reed tubes mentioned above can be the normally open dry reed tubes shown in Figure 10, and all the dry type reed tubes are electrically connected in series. Alternatively, all dry reeds may be normally closed dry reeds as shown in Figure 11, and all dry reeds are electrically connected in parallel. Alternatively, all dry-type reed tubes may be switched-type dry-type reed tubes as shown in Figures 12A and 12B, and all dry-type reed tubes are electrically connected in series and parallel.

In addition, all dry reed switches in the battery core 100 are electrically connected in parallel, and all dry reed switches can also be electrically connected to the battery management system 20 through different sampling channels. Therefore, the battery management system 20 can accurately detect which battery cell 100 among the plurality of battery cells 100 has a thermal abnormality, and facilitate the location of the thermal abnormality of the battery cell among the plurality of battery cells 100 .

Below, the battery 1 corresponding to the above content is introduced in detail. For the convenience of explanation, this application uses two battery cells as a group for illustration.

Please refer to FIGS. 17 and 18 , which are partial structural schematic diagrams of a battery provided by an embodiment of the present application.

In some embodiments, as shown in FIGS. 17 and 18 , in the battery 1 of the present application, the battery module 10 may include: a first battery cell 100a and a second battery cell 100b.

It should be noted that for multiple battery cells 100, the battery module 10 can be arranged, but is not limited to the arrangement of two battery cells 100, the first battery cell 100a and the second battery cell 100b, as a group. It only needs to be ensured that The dry reeds in each group of battery cells 100 are electrically connected to the battery management system 20 through the same sampling channel.

In Figure 17, the first battery core 100a and the second battery core 100b may respectively include the bare battery core 101, the electrolyte 107, the battery core shell 102, the first temperature sensing magnet 103, and the first dry cell as shown in Figure 4. Type reed 104.

Wherein, the first dry-type reed switch 104 in the first battery core 100a and the first dry-type reed switch 104 in the second battery core 100b are electrically connected in series and/or in parallel. The first dry reed 104 is also electrically connected to the sampling channel 1 of the detection module 201 .

Based on the above electrical connection relationship, the detection module 201 detects the conduction state of the first dry reed 104 in the first battery core 100a and/or the conduction state of the first dry reed 104 in the second battery core 100b. After the conduction state changes, the detection result can be sent to the host unit. After receiving the detection result, the host unit 202 may determine that a first degree of thermal abnormality occurs in the first battery core 100a and/or the second battery core 100b.

In Figure 18, based on the structure shown in Figure 17, the first battery core 100a and the second battery core 100b can also include a second temperature-sensitive magnet 105 and a second dry reed switch as shown in Figure 15. 106.

Wherein, the second dry-type reed switch 106 in the first battery core 100a and the second dry-type reed switch 106 in the second battery core 100b are electrically connected in series and/or in parallel. The second dry reed 106 is also electrically connected to the sampling channel 2 of the detection module 201 .

Based on the above electrical connection relationship, the detection module 201 detects the conduction state of the second dry reed 106 in the first battery cell 100a and/or the conduction state of the second dry reed 106 in the second battery core 100b. After the conduction state changes, it is determined that the first battery core 100a and/or the second battery core 100b has a second degree of thermal abnormality.

It should be noted that the electrical connection method between the first dry reed switch 104 in the first battery core 100a and the first dry type reed switch 104 in the second battery core 100b is different from that in the first battery core 100a. The electrical connection methods of the second dry reed switch 106 and the second dry reed switch 106 in the second battery core 100b may be the same or different, and each electrical connection method and corresponding working principle are similar. Therefore, for the convenience of explanation, this application uses the same electrical connection method of the second dry-type reed switch 106 in the first battery cell 100a and the second dry-type reed switch 106 in the second battery cell 100b as an example for detailed description. .

Next, with reference to Figures 19-21, the working principle of implementing the over-temperature warning function for multiple battery cells 100 will be introduced in detail.

Please refer to FIG. 19 , which shows a partial structural diagram of a battery provided by an embodiment of the present application.

As shown in Figure 19, the first dry reed tube 104 in the first battery cell 100a and the first dry type reed tube 104 in the second battery cell 100b adopt the normally open dry reed tube shown in Figure 10. The first dry reed tube 104 in the first cell 100a and the first dry reed tube 104 in the second cell 100b are electrically connected in series.

Among them, the first end P1 of the first dry reed 104 in the first battery cell 100a is electrically connected to the first end 1 of the detection module 201. The second end P2 of the first dry reed 104 in the first cell 100a is electrically connected to the first end P1 of the first dry reed 104 in the second cell 100b. The second end P2 of the first dry reed 104 in the second battery cell 100b is electrically connected to the second end 2 of the detection module 201.

When the first dry reed tube 104 in the first battery core 100a and the first dry reed tube 104 in the second battery core 100b both have magnetic fields in the space, the first dry type reed tube 104 in the first battery core 100a The reed inside the reed 104 is closed, and the first end P1 and the second end P2 of the first dry reed 104 in the first battery core 100a are connected. The reed inside the first dry reed 104 in the second battery core 100b is closed, and the first end P1 and the second end P2 of the first dry reed 104 in the second battery core 100b are connected.

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

The magnetic field in the space where at least one of the first dry reed switches 104 in the first cell 100a and the first dry reed switch 104 in the second cell 100b is located disappears (ie, there is no magnetic field). ), taking the first dry-type reed switch 104 in the second battery cell 100b as an example, the reed inside the first dry-type reed switch 104 in the second battery core 100b is disconnected, and the reed in the second battery core 100b The first end P1 and the second end P2 of the first dry reed 104 are disconnected.

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

Therefore, after detecting that the first dry reed switch 104 in the second battery cell 100b changes from a low-impedance conductive state to a high-impedance non-conductive state, the battery management system 20 can determine that the first battery cell 100a and/or Thermal abnormality occurs in the second battery cell 100b.

Please refer to FIG. 20 , which shows a partial structural diagram of a battery provided by an embodiment of the present application.

As shown in Figure 20, the first dry reed tube 104 in the first battery cell 100a and the first dry type reed tube 104 in the second battery cell 100b adopt the normally open dry reed tube shown in Figure 10. The first dry reed tube 104 in the first cell 100a and the first dry reed tube 104 in the second cell 100b are electrically connected in parallel.

Among them, the first end P1 of the first dry reed 104 in the first battery cell 100a, and the first end P1 of the first dry reed 104 in the second battery core 100b are both connected to the detection module 201. The first end 1 is electrically connected. The second end P2 of the first dry reed 104 in the first cell 100a and the second end P2 of the first dry reed 104 in the second cell 100b are both connected to the second end of the detection module 201 2 electrical connections.

When the first dry reed tube 104 in the first battery core 100a and the first dry reed tube 104 in the second battery core 100b both have magnetic fields in the space, the first dry type reed tube 104 in the first battery core 100a The reed inside the reed 104 is disconnected, and the first end P1 and the second end P2 of the first dry reed 104 in the first battery core 100a are disconnected. The reed inside the first dry reed 104 in the second cell 100b is disconnected, and the first end P1 and the second end P2 of the first dry reed 104 in the second cell 100b are disconnected.

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

The magnetic field in the space where at least one of the first dry reed switches 104 in the first cell 100a and the first dry reed switch 104 in the second cell 100b is located disappears (ie, there is no magnetic field). ), taking the first dry-type reed 104 in the second battery cell 100b as an example, the reed inside the first dry-type reed 104 in the second battery core 100b is closed, and the reed in the second battery core 100b The first terminal P1 and the second terminal P2 of the first dry reed switch 104 are electrically connected.

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

Therefore, after detecting that the conduction state of the first dry reed switch 104 in the second battery cell 100b changes from a high-impedance non-conduction state to a low-impedance conduction state, the battery management system 20 can determine that the first battery cell 100b has a conductive state. Thermal abnormality occurs in 100a and/or the second battery cell 100b.

Please refer to FIG. 21 , which shows a partial structural diagram of a battery provided by an embodiment of the present application.

As shown in Figure 21, the first dry reed tube 104 in the first battery cell 100a and the second dry type reed tube 104 in the second battery cell 100b adopt the switching type dry type reed tube shown in Figures 12A-12B. Reed switch, the first dry-type reed switch 104 in the first battery core 100a and the first channel of the first dry-type reed switch 104 in the second battery core 100b are electrically connected in series, and the first dry-type reed switch 104 in the first battery core 100b is electrically connected in series. The first dry reed 104 and the second channel of the first dry reed 104 and the second channel of the third dry reed 110 in the second battery core 100b are electrically connected in parallel.

In the first channel, the first end P2 of the first dry reed 104 in the first cell 100a is electrically connected to the second end P1 of the first dry reed 104 in the second cell 100b. The second end P1 of the first dry reed 104 in the first battery cell 100a is electrically connected to the second end 2 of the detection module 201. The first end P2 of the first dry reed 104 in the second battery cell 100b is electrically connected to the first end 1 of the detection module 201.

In the second channel, the first end P2 of the first dry reed 104 in the second cell 100b is electrically connected to the first end 1 of the detection module 201. The third end P3 of the first dry reed 104 in the first cell 100a and the third end P3 of the first dry reed 104 in the second cell 100b are both connected to the third end of the detection module 201. Terminal 3 is electrically connected.

When the first dry reed tube 104 in the first battery core 100a and the first dry reed tube 104 in the second battery core 100b both have magnetic fields in the space, the first dry type reed tube 104 in the first battery core 100a The first end P2 and the second end P1 of the reed 104 are electrically connected, and the first end P2 and the second end P1 of the first dry reed 104 in the second battery core 100b are electrically connected. At this time, the conduction state of the first channel can be regarded as a low-impedance conduction state.

The first end P2 and the third end P3 of the first dry reed 104 in the first cell 100a are disconnected, and the first end P2 and the third end P3 of the first dry reed 104 in the second cell 100b are disconnected. The third terminal P3 is disconnected. At this time, the conduction state of the second channel can be regarded as a high-impedance non-conduction state.

The magnetic field in the space where at least one of the first dry reed switches 104 in the first cell 100a and the first dry reed switch 104 in the second cell 100b is located disappears (ie, there is no magnetic field). ), taking the first dry-type reed switch 104 in the second battery cell 100b as an example, the reed inside the first dry-type reed switch 104 in the second battery core 100b switches the corresponding connection terminal.

The first terminal P2 and the second terminal P1 of the first dry reed 104 in the second battery cell 100b are disconnected. At this time, the conduction state of the first channel can be regarded as a high-impedance non-conduction state.

The first terminal P2 and the third terminal P3 of the first dry reed 104 in the second battery cell 100b are electrically connected. At this time, the conduction state of the second channel can be regarded as a low-impedance conduction state.

Therefore, the battery management system 20 detects that the conduction state of the first channel changes from the low impedance conduction state to the high impedance non-conduction state, and the conduction state of the second channel changes from the high impedance non-conduction state to low impedance. After the conduction state, it can be determined that thermal abnormality occurs in the first battery core 100a and/or the second battery core 100b.

In this application, for the first battery core 100a and the second battery core 100b, paired first temperature sensing magnets 103 and first dry reed tubes 104 can be arranged respectively. With the help of the first battery core 100a and the second battery core 100b The respective first dry reeds 104 are electrically connected to the battery management system 20 through the same sampling channel, so that the battery management system 20 can measure the first battery cell 100a and the battery management system 20 through a smaller number of connection terminals in the same sampling channel. The temperature status of the second battery core 100b is jointly monitored to provide a quick warning when thermal abnormalities occur in the first battery core 100a and/or the second battery core 100b.

Finally, it should be noted that the above embodiments are only specific implementation modes of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be covered by this application. within the scope of protection applied for. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

An electric core, characterized in that it includes: a bare electric core, an electrolyte, an electric core shell, a first temperature-sensing magnet, and a first dry reed tube;

Wherein, the battery core shell is made of non-magnetic shielding material, the battery core shell has an accommodation cavity, the electrolyte is injected into the accommodation cavity, and the bare battery core is placed in the accommodation cavity, so The first temperature-sensing magnet is placed in the accommodation cavity or outside the accommodation cavity, the first dry reed tube is placed outside the accommodation cavity, and the first dry reed tube is used to communicate with the battery management System electrical connections;

The first temperature-sensing magnet is used to sense the temperature inside the battery core; wherein, if the temperature inside the battery core is equal to or higher than the Curie temperature of the first temperature-sensing magnet, the third temperature-sensing magnet The magnetism of a temperature-sensitive magnet disappears, and the Curie temperature of the first temperature-sensitive magnet matches the thermal runaway critical temperature of the battery 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 detects the conduction of the first dry reed. After the conduction state changes, it is determined that the battery core has a thermal abnormality.
The battery core according to claim 1, characterized in that the battery core further includes: a second temperature-sensitive magnet and a second dry reed tube; wherein the Curie temperature of the second temperature-sensitive magnet is equal to The first temperature-sensing magnet has different Curie temperatures, the second temperature-sensing magnet is placed inside or outside the accommodation cavity, and the second dry reed tube is placed outside the accommodation cavity. , the second dry reed and the first dry reed are respectively used to electrically connect with the battery management system;

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 detects the first dry reed. After the conduction state of the battery core changes, it is determined that the battery core has a thermal abnormality, specifically: after the magnetism of the first temperature-sensing magnet disappears, the conduction state of the first dry reed tube changes, so that the conduction state of the first dry reed tube changes. The battery management system determines that a first degree of thermal abnormality occurs in the battery core after detecting a change in the conduction state of the first dry reed;

The second temperature-sensitive magnet is used to sense the temperature inside the battery core; wherein, if the temperature inside the battery core is equal to or higher than the Curie temperature of the second temperature-sensitive magnet, the third temperature-sensitive 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 core;

After the magnetism of the second temperature sensing magnet disappears, the conduction state of the second dry reed changes, so that the battery management system detects the conduction of the second dry reed. After the conduction state changes, it is determined that the battery core has a second degree of thermal abnormality, and the second degree is different from the first degree.
The battery core according to claim 2, wherein the Curie temperature of the first temperature-sensitive magnet or the Curie temperature of the second temperature-sensitive magnet is less than a thermal runaway critical temperature of the battery core.
The battery core according to any one of claims 1 to 3, characterized in that the first dry reed is a normally open dry reed;

After the magnetism of the temperature-sensitive magnet disappears, the conductive state of the first dry reed tube changes from a low-impedance conductive state to a high-impedance non-conductive state.
The battery core according to any one of claims 1 to 3, characterized in that the first dry reed is a normally closed dry reed;

After the magnetism of the temperature-sensitive magnet disappears, the conductive state of the first dry reed tube changes from a high-impedance non-conductive state to a low-impedance conductive state.
The battery core according to any one of claims 1 to 3, characterized in that the first dry reed is a switching dry reed, and the first end of the first dry reed is and the second end form a first channel, and the first end and the third end of the first dry reed tube form a second channel;

After the magnetism of the temperature-sensitive magnet disappears, the conduction state of the first channel changes from a low-impedance conduction state to a high-impedance non-conduction state, and the conduction state of the second channel changes from a high-impedance non-conduction state. The state changes to a low impedance conduction state.
The battery core according to any one of claims 1-6, characterized in that:

The first dry reed tube is fixed on the outer surface of the battery housing;

Alternatively, the first dry reed tube is fixed outside the battery core housing.
The battery core according to any one of claims 1-7, characterized in that:

The temperature-sensitive magnet is fixed on the inner surface of the battery core housing;

Alternatively, the temperature-sensitive magnet is fixed on the outer surface of the battery core housing;

Alternatively, the temperature-sensitive magnet is fixed outside the battery core housing.
A battery module, characterized by comprising: at least one battery cell according to any one of claims 1-8.
The battery module according to claim 9, wherein when the battery module includes a first battery cell and a second battery cell, the dry reed switch in the first battery cell and the third battery module are The dry reed tubes in the two cells are electrically connected in series.
The battery module according to claim 9, wherein when the battery module includes a first battery cell and a second battery cell, the dry reed switch in the first battery cell and the third battery module are The dry reed switches in the two cells are electrically connected in parallel.
A battery, characterized by comprising: a battery management system and the battery module according to any one of claims 9-11;

The battery management system is used to detect the conduction state of the first dry reed tube, and determine that a thermal abnormality occurs in the battery core after detecting a change in the conduction state of the first dry reed tube. .
The battery according to claim 12, wherein the battery management system includes: a detection module and a host unit;

Wherein, the detection module is electrically connected to the dry reed in the battery module, and the detection module is also electrically connected to the host unit;

The detection module is configured to send a detection result to the host unit after detecting a change in the conduction state of the dry reed tube;

The host unit is configured to determine that the battery core corresponding to the dry reed switch in the battery module has a thermal abnormality after receiving the detection result.
An electronic device, characterized by comprising: the battery according to claim 12 or 13.
A mobile device, characterized by comprising: the battery according to claim 12 or 13.
An energy storage device, characterized by comprising: the battery according to claim 12 or 13.