Battery with fire extinguishing function

Abstract

The utility model discloses a battery with a fire extinguishing function. The battery comprises a shell; the battery cell is located in the containing cavity, a first cavity is formed in the middle of the battery cell, and a second cavity is formed between the circumferential outer side wall of the battery cell and the circumferential inner side wall of the shell; wherein fire extinguishing bags are arranged in the first cavity and the second cavity, and each fire extinguishing bag comprises a bag body and a fire extinguishing matrix located in the bag body. As the fire extinguishing bags are arranged at the middle position and the edge position in the battery, and each fire extinguishing bag comprises the bag body and the fire extinguishing matrix positioned in the bag body, when the battery cell is heated and is on fire, the bag body of each fire extinguishing bag is melted to release the fire extinguishing matrix, and the fire extinguishing matrix can extinguish fire and cool the battery cell. The fire extinguishing bag is arranged in the battery, so that cooling and fire extinguishing can be carried out when temperature runaway occurs in the battery and the initial stage of fire, explosion and deflagration caused by further expansion of thermal runaway of the battery are prevented, the fire spreading risk is further reduced, and the personal and property safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery safety, and particularly relates to a battery with a fire extinguishing function. Background Art

[0002] As an important part of the current new energy development, batteries are widely used in various electronic products, photovoltaics, energy storage, automobiles, electrical equipment, etc. With the continuous progress of technology, batteries have developed into a variety of rechargeable batteries, such as lead-acid batteries, lithium-ion batteries, sodium-ion batteries, etc. Among them, lithium-ion batteries are the current mainstream products, and they are further divided into lithium iron phosphate batteries, ternary lithium batteries, cobalt acid lithium batteries, polymer lithium-ion batteries, etc. from the cathode materials. Although the performance of each battery is different, they all have a common drawback, that is, the battery materials themselves are active substances, and they are prone to explosion, combustion and generate a large amount of thick smoke during thermal runaway. This drawback is random during use, difficult to control, and easily causes losses to personal safety and property. Although battery manufacturers, battery pack manufacturers or end-users all try their best to improve the safety of these batteries, it is very difficult to ensure 100%. Therefore, the safety issue of the battery itself must be taken seriously.

[0003] Currently, the main means for the safety issues of batteries and battery packs are battery management and thermal management, and the configuration of fire extinguishing devices is used as an auxiliary means. Battery management refers to preventing overcharging, over-discharging, over-temperature, short-circuit, etc. during the use of batteries or battery packs. Thermal management refers to preventing problems such as high temperature, low temperature, high and low temperature shock, uneven temperature distribution, etc. of batteries or battery packs from causing thermal runaway. The fire extinguishing device refers to a device that extinguishes fire when the battery or battery pack undergoes thermal runaway and explodes or burns. Even with the above several means of layer-by-layer protection, it is still difficult to avoid the occurrence of battery accidents. Because the explosion and combustion of the battery usually occur within a very short time, the post-treatment reaction time is not fast enough, the external fire extinguishing and cooling effect is not obvious and it is easy to reignite. In addition, the application environment of the battery is also very difficult to fix, and the explosion and combustion of the battery may be caused by external forces such as impact, extrusion, and drop. Therefore, it is very difficult to achieve the safety and reliability of the battery itself and a fast response speed for this kind of randomness. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery with a fire extinguishing function, which can quickly and effectively extinguish the fire and reduce the temperature of the battery at the initial stage of temperature runaway and fire, prevent the further expansion of battery thermal runaway leading to explosion and deflagration, and then reduce the risk of fire spread, and ensure personal and property safety.

[0005] In one embodiment, a battery with a fire extinguishing function is provided, including:

[0006] A housing, the housing having a receiving cavity;

[0007] A battery cell, the battery cell is located in the accommodation cavity, and a first cavity is formed in the middle of the battery cell, and a second cavity is formed between the circumferential outer wall of the battery cell and the circumferential inner wall of the housing;

[0008] Wherein, a fire extinguishing bag is arranged in the first cavity and the second cavity, the fire extinguishing bag includes a bag body and a fire extinguishing matrix located in the bag body, the bag body will be melted in a high-temperature environment to release the fire extinguishing matrix, and the fire extinguishing matrix is used for extinguishing fire and reducing the temperature of the battery cell.

[0009] In one embodiment, both the bag body and the fire extinguishing matrix are flexible bodies, the bag body abuts against the circumferential inner wall of the first cavity, and the bag body abuts against the circumferential inner wall of the second cavity.

[0010] In one embodiment, the bag body abuts against the axial inner wall of the first cavity, and the bag body abuts against the axial inner wall of the second cavity.

[0011] In one embodiment, the fire extinguishing bag fills the first cavity and the second cavity.

[0012] In one embodiment, the fire extinguishing bags in the first cavity and the second cavity are in a compressed state.

[0013] In one embodiment, the bag body is a film structure.

[0014] In one embodiment, the bag body is an insulating and heat-conducting film.

[0015] In one embodiment, the melting point temperature of the bag body is 80°C - 100°C.

[0016] In one embodiment, the first cavity is a hollow structure formed by winding the battery cell, and the fire extinguishing bag located in the first cavity is a columnar structure; and / or, the second cavity is an annular cavity surrounding the battery cell, and the fire extinguishing bag located in the second cavity is an annular structure.

[0017] In one embodiment, a battery with a fire extinguishing function is provided, including:

[0018] A housing, the housing has an accommodation cavity;

[0019] A battery cell, the battery cell is located in the accommodation cavity, and a first cavity is formed in the middle of the battery cell, and a second cavity is formed between the circumferential outer wall of the battery cell and the circumferential inner wall of the housing;

[0020] Wherein, a fire extinguishing bag is provided in the first cavity or the second cavity. The fire extinguishing bag includes a bag body and a fire extinguishing matrix located inside the bag body. The bag body will be melted in a high-temperature environment to release the fire extinguishing matrix, and the fire extinguishing matrix is used for fire extinguishing and reducing the temperature of the battery cell.

[0021] For the battery with a fire extinguishing function according to the above embodiment, since fire extinguishing bags are provided at the middle position and the edge position inside the battery, the fire extinguishing bag includes a bag body and a fire extinguishing matrix located inside the bag body. When the temperature of the battery cell rises and catches fire, the bag body of the fire extinguishing bag will be melted to release the fire extinguishing matrix, and the fire extinguishing matrix can extinguish the fire and lower the temperature of the battery cell. The fire extinguishing bag is provided inside the battery, so that when the temperature gets out of control and the fire breaks out initially inside the battery, it can lower the temperature and extinguish the fire, prevent the further expansion of battery thermal runaway leading to explosion and deflagration, and further reduce the risk of fire spread, ensuring personal and property safety.

[0022] Furthermore, the fire extinguishing bags are arranged at the middle position formed by winding the battery cell and at the gap position between the battery cell and the housing. The fire extinguishing bags make full use of the space gaps originally generated during the battery production design, which can reduce the development and design costs of the battery with a fire extinguishing function and also reduce the production costs. At the same time, after the fire extinguishing bags fill the gaps inside the battery, the battery cells inside the battery are installed more firmly, can resist greater impact forces, and are beneficial to improving the impact resistance safety of the battery. Description of the Drawings

[0023] Figure 1 It is a radial cross-sectional view of a battery with a fire extinguishing function in an embodiment;

[0024] Figure 2 It is an axial cross-sectional view of a battery with a fire extinguishing function in an embodiment;

[0025] Figure 3 It is an axial cross-sectional view of a first fire extinguishing bag in an embodiment;

[0026] Figure 4 It is an axial cross-sectional view of a battery with a fire extinguishing function in an embodiment;

[0027] Figure 5 It is an axial cross-sectional view of a battery with a fire extinguishing function in an embodiment;

[0028] Figure 6 It is a radial cross-sectional view of a battery with a fire extinguishing function in an embodiment;

[0029] Figure 7 It is a radial cross-sectional view of a battery with a fire extinguishing function in an embodiment;

[0030] The reference numerals are as follows:

[0031] 1 - housing, 11 - accommodation cavity;

[0032] 2 - battery cell, 21 - first cavity, 22 - second cavity;

[0033] 3 - fire extinguishing bag, 3a - first fire extinguishing bag, 3b - second fire extinguishing bag, 31 - bag body, 32 - fire extinguishing matrix;

[0034] 4 - positive electrode tab;

[0035] 5 - negative electrode tab. Specific embodiments

[0036] The present utility model will be further described in detail below in conjunction with the accompanying drawings through specific embodiments. Similar elements in different embodiments are labeled with related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and the general technical knowledge in the art.

[0037] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment and do not mean that they are the necessary sequences unless it is stated that a certain sequence must be followed.

[0038] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connections (couplings).

[0039] In one embodiment, a battery with a fire extinguishing function is provided. The battery is not limited to the material of its battery cell and can include, but is not limited to, lead - acid batteries, lithium - ion batteries, sodium - ion batteries, etc. A fire extinguishing bag is provided inside the battery. The fire extinguishing bag is located inside the battery and can sense the temperature rise and fire inside the battery in the first instance. The fire extinguishing bag can cool down and extinguish the fire in the initial stage of the temperature rise and fire inside the battery, prevent the further expansion of battery thermal runaway leading to explosion and deflagration, and thus reduce the risk of fire spread, ensuring personal and property safety.

[0040] The fire extinguishing bag of this embodiment is a flexible bag structure, which is arranged in the gap space formed by winding the battery core and in the gap space between the battery core and the housing. The size and shape of the fire extinguishing bag can be set according to the two gap spaces in the battery, so that the fire extinguishing bag can be filled in the two gap spaces in the battery, without the need to additionally set other accommodation spaces to prevent the fire extinguishing material, which can reduce the development, design and production costs of the battery.

[0041] The fire extinguishing bag of this embodiment can also play a buffering role, improve the stability of the installation of the battery core in the battery, and is beneficial to improving the safety of the battery against impact.

[0042] Please refer to Figures 1 to 3 , the battery with fire extinguishing function of this embodiment mainly includes a housing 1, a battery core 2 and a fire extinguishing bag 3. The battery also includes a positive electrode tab 4 and a negative electrode tab 5.

[0043] The housing 1 is a cylindrical structure, and the housing 1 can be enclosed by two end plates and a cylindrical plate. The housing 1 has a receiving cavity 11, and the receiving cavity 11 is a hollow cylindrical cavity. The positive electrode tab 4 is installed on one axial end face of the housing 1, and the negative electrode tab 5 is installed on the other axial end face of the housing 1. The positive electrode tab 4 and the negative electrode tab 5 are used as the positive and negative electrodes of the battery and are used to electrically connect to an external circuit.

[0044] The battery core 2 can be wound by positive and negative electrodes, a separator and an electrolyte. The battery core 2 is installed in the receiving cavity 11 of the housing 1. The positive electrode of the battery core 2 is connected to the positive electrode tab 4, and the negative electrode of the battery core 2 is connected to the negative electrode tab 5.

[0045] The middle part of the battery core 2 has a first cavity 21. The first cavity 21 of the battery core 2 is a hollow structure formed by winding the battery core 2. The winding shape of the battery core 2 is the same as that of the housing 1. The battery core 2 is wound into a cylinder, and a hollow columnar cavity is formed in the middle of the battery core 2, that is, the first cavity 21 is a hollow columnar cavity.

[0046] There is a gap space between the circumferential outer wall of the battery core 2 and the circumferential inner wall in the housing 1, and this gap space forms a second cavity 22. The second cavity 22 is an annular cavity.

[0047] Among them, the two axial ends of the battery core 2 are respectively abutted against the axial inner wall in the housing 1, so that the battery core 2 can be connected to the positive electrode tab 4 and the negative electrode tab 5, and there is no gap space between the battery core 2 and the housing 1 in the axial direction, which can improve the stability of the axial position of the battery core 2.

[0048] In this embodiment, there are two fire extinguishing bags 3. One fire extinguishing bag 3 is arranged in the first cavity 21, and the other fire extinguishing bag 3 is arranged in the second cavity 22.

[0049] During the production process of the battery, due to process and installation requirements, a gap space is formed in the middle of the battery cell 2, and a gap space also appears between the battery cell 2 and the housing 1. On this basis, a first cavity 21 and a second cavity 22 are formed. The fire extinguishing bag 3 is set as a flexible body, which can effectively adapt to the first cavity 21 and the second cavity 22, so that the fire extinguishing bag 3 can be installed in the first cavity 21 and the second cavity 22 in a filling manner. The fire extinguishing bag 3 is fixed in the first cavity 21 and the second cavity 22 by expansion extrusion, and there is no need to additionally set up an installation structure for the fire extinguishing bag 3. Moreover, the flexible fire extinguishing bag 3 has a shock-absorbing effect. The fire extinguishing bag 3 forms a protection area. When the battery is subjected to an external impact force, the fire extinguishing bag 3 can absorb vibrations and reduce the impact force, and can prevent the battery from burning and exploding due to external forces such as extrusion, impact, puncture, and vibration.

[0050] Among them, the spaces of the first cavity 21 and the second cavity 22 can be appropriately set to be larger, etc., to accommodate more fire extinguishing materials.

[0051] For the convenience of description, one fire extinguishing bag 3 is the first fire extinguishing bag 3a, and the other fire extinguishing bag 3 is the second fire extinguishing bag 3b. The first fire extinguishing bag 3a is arranged in the first cavity 21, and the second fire extinguishing bag 3b is arranged in the second cavity 22. The first fire extinguishing bag 3a is adapted to the shape of the first cavity 21, and the first fire extinguishing bag 3a is a cylindrical structure; the second fire extinguishing bag 3b is adapted to the shape of the second cavity 22, and the second fire extinguishing bag 3b is an annular structure.

[0052] The fire extinguishing bag 3 includes a bag body 31 and a fire extinguishing matrix 32 located inside the bag body 31, that is, both the first fire extinguishing bag 3a and the second fire extinguishing bag 3b include a bag body 31 and a fire extinguishing matrix 32. The first fire extinguishing bag 3a and the second fire extinguishing bag 3b have bag bodies 31 and fire extinguishing matrices 32 of the same material, and the first fire extinguishing bag 3a and the second fire extinguishing bag 3b have bag bodies 31 and fire extinguishing matrices 32 of different shapes.

[0053] The bag body 31 is a film structure. The bag body 31 is a material that is resistant to electrolyte corrosion, insulating, does not chemically react with the material of the battery cell 2, and has different temperature grades. For example, the bag body 31 is a plastic film or a polymer material film. The fire extinguishing matrix 32 is a fire extinguishing agent. The fire extinguishing matrix 32 includes, but is not limited to, gases, liquids, and solids and their combinations. The fire extinguishing matrix 32 includes functional materials for extinguishing fires, cooling, and isolating oxygen.

[0054] In this embodiment, the bag body 31 is selected from materials with a melting point of 80°C - 100°C, preferably the melting point of the bag body 31 is 80° or close to 80°. The battery cell 2 is within the normal operating temperature below 80°C. When the battery cell 2 exceeds 80°C, it means that the battery cell 2 has a temperature loss, and further temperature increase will result in combustion and explosion. Therefore, the melting point of the bag body 31 is 80°C - 100°C, which can melt and release the fire extinguishing matrix 32 for cooling and fire extinguishing in the initial stage of the temperature rise of the battery cell 2, preventing problems before they occur.

[0055] In this embodiment, the first fire extinguishing bag 3a and the second fire extinguishing bag 3b can be in a compressed state. That is, when the first fire extinguishing bag 3a is not installed in the first cavity 21, the volume of the first fire extinguishing bag 3a is greater than that of the first cavity 21; when the first fire extinguishing bag 3a is installed in the first cavity 21, the first fire extinguishing bag 3a abuts against the circumferential inner side wall of the first cavity 21, that is, the circumferential outer side wall of the first fire extinguishing bag 3a abuts against the circumferential inner side wall in the middle of the battery cell 2; when the second fire extinguishing bag 3b is not installed in the second cavity 22, the volume of the second fire extinguishing bag 3b is greater than that of the second cavity 22; when the second fire extinguishing bag 3b is installed in the second cavity 22, the second fire extinguishing bag 3b abuts against the circumferential inner side wall of the second cavity 22, that is, the circumferential inner side wall of the second fire extinguishing bag 3b abuts against the circumferential outer side wall of the battery cell 2, and the circumferential outer side wall of the second fire extinguishing bag 3b abuts against the circumferential inner side wall of the housing 1. With such a setting, the first fire extinguishing bag 3a and the second fire extinguishing bag 3b are in a compressed state in the radial direction, so that the fire extinguishing matrix 32 that can be compressed after the bag bodies 31 of the first fire extinguishing bag 3a and the second fire extinguishing bag 3b are melted can be quickly ejected to achieve temperature reduction and fire extinguishing.

[0056] For the battery with a fire extinguishing function in this embodiment, since fire extinguishing bags 3 are provided at the middle position and the edge position inside the battery, and the fire extinguishing bags 3 include bag bodies 31 and fire extinguishing matrices 32 located inside the bag bodies 31, when the battery cell 2 gets heated up and catches fire, the bag bodies 31 of the fire extinguishing bags 3 will be melted to release the fire extinguishing matrices 32, and the fire extinguishing matrices 32 can extinguish the fire and reduce the temperature of the battery cell 2. By providing the fire extinguishing bags 3 inside the battery, when the temperature gets out of control and a fire breaks out in the initial stage inside the battery, temperature reduction and fire extinguishing can be carried out, preventing the further expansion of battery thermal runaway and resulting in explosion and deflagration, thereby reducing the risk of fire spread and ensuring personal and property safety.

[0057] The fire extinguishing bags 3 are arranged at the middle gap position formed by winding the battery cell and at the gap position between the battery cell 2 and the housing 1. The fire extinguishing bags 3 make full use of the space gaps originally generated during the battery production design, which can reduce the development and design cost of the battery with a fire extinguishing function and also reduce the production cost; at the same time, after the fire extinguishing bags 3 fill the gaps inside the battery, the battery cells inside the battery are more firmly installed, can resist greater impact forces, and are beneficial to improving the impact resistance safety of the battery.

[0058] The second fire extinguishing bag 3b is arranged in the second cavity 22 to form a protection area on the circumferential outer side of the battery cell 2. When external heat of the battery invades, the second fire extinguishing bag 3b can play a role in temperature reduction and heat insulation, avoiding the influence of external heat invasion on the battery cell 2.

[0059] In one embodiment, the fire extinguishing bag 3 abuts against the circumferential inner sidewalls of the first cavity 21 and the second cavity 22, and the fire extinguishing bag 3 also abuts against the axial inner sidewalls of the first cavity 21 and the second cavity 22, increasing the contact area between the fire extinguishing bag 3 and the inner sidewalls of the first cavity 21 and the second cavity 22, which can improve the sensitivity of the fire extinguishing bag 3 to induction melting and also improve the buffering effect of the fire extinguishing bag 3.

[0060] In one embodiment, the fire extinguishing bag 3 can fill the first cavity 21 and the second cavity 22, and there is no gap space after the first cavity 21 and the second cavity 22 are filled with the fire extinguishing bag 3, and the fire extinguishing bag 3 abuts against the circumferential and axial inner sidewalls of the first cavity 21 and the second cavity 22.

[0061] Filling the first cavity 21 and the second cavity 22 with the fire extinguishing bag 3 can further improve the fire extinguishing and buffering effects of the fire extinguishing bag 3.

[0062] In one embodiment, the bag body 31 of the fire extinguishing bag 3 is a heat-conducting film, and the heat-conducting film has good heat-conducting effect, which can transfer the heat generated by the battery cell 2 to the fire extinguishing matrix 32 in the bag body 31 to achieve the cooling of the battery cell 2.

[0063] The bag body 31 has heat-conducting effect. When the bag body 31 of the fire extinguishing bag 3 is not melted, it can play a good role in cooling the battery cell 2, so that when the temperature rise of the battery cell 2 is small and it returns to the normal working temperature range, the battery cell 2 can still continue to work normally, thereby improving the service life of the battery.

[0064] In one embodiment, the battery can also be in other forms. For example, the battery can include but is not limited to oval, square batteries and soft-pack batteries. Different forms of batteries can also have a first cavity 21 provided in the middle of the battery to install the first fire extinguishing bag 3a, and a second cavity 22 provided at the circumferential edge in the battery to install the second fire extinguishing bag 3b. In other words, setting the fire extinguishing bag 3 at the middle position and the edge position in the battery is not limited to the form of the battery, and the fire extinguishing bag 3 can be set in various forms of batteries to achieve heating and cooling and extinguishing in the initial stage of ignition.

[0065] As Figure 4 shown, the battery can be an oval battery or a square battery. The axial cross-section of the oval battery or the square battery is oval or racetrack-shaped, and the battery cell 2 is wound into the corresponding oval or racetrack shape. The axial cross-section of the first cavity 21 formed by winding the battery cell 2 in the middle is a long strip with semicircles at both ends, and the axial cross-section of the second cavity 22 between the battery cell 2 and the housing 1 is racetrack-shaped.

[0066] The first fire extinguishing bag 3a is set to the shape corresponding to the first cavity 21, and the axial cross-section of the first fire extinguishing bag 3a is a long strip with semicircles at both ends. The second fire extinguishing bag 3b is set to the shape corresponding to the second cavity 22, and the axial cross-section of the second fire extinguishing bag 3b is racetrack-shaped.

[0067] As Figure 5 shown, the battery can be a pouch battery. The axial cross-section of the pouch battery is a square with rounded chamfers, and the battery cell 2 is wound into a corresponding square. The axial cross-section of the second cavity 22 between the battery cell 2 and the housing 1 is a square with rounded chamfers.

[0068] The second fire extinguishing bladder 3b is set to the shape corresponding to the second cavity 22, and the axial cross-section of the second fire extinguishing bladder 3b is a square with rounded chamfers.

[0069] In one embodiment, a battery with a fire extinguishing function is provided. The difference between the battery in this embodiment and any of the above embodiments lies in that the fire extinguishing bladder 3 is disposed in the first cavity 21 or the second cavity 22.

[0070] In this embodiment, a fire extinguishing bladder 3 is provided inside the battery 2. The fire extinguishing bladder 3 is the first fire extinguishing bladder 3a in the above embodiment. A first cavity 21 is provided inside the battery, and the first fire extinguishing bladder 3a is disposed in the first cavity 21 in the middle of the battery cell 2.

[0071] Please refer to Figure 6 , in this embodiment, only the first fire extinguishing bladder 3a is provided in the middle of the battery cell 2, which can also play the roles of heat conduction and fire extinguishing for the battery cell 2, effectively preventing the combustion and explosion of the battery, and improving the safety of the battery.

[0072] Please refer to Figure 7 , in other embodiments, the fire extinguishing bladder 3 is the second fire extinguishing bladder 3b in the above embodiment. A second cavity 22 is provided inside the battery, and the second fire extinguishing bladder 3b is disposed in the second cavity 22 in the middle of the battery cell 2. Only the second fire extinguishing bladder 3b is provided at the circumferential edge inside the battery cell 2, which can also play the roles of heat insulation, buffering and fire extinguishing for the battery cell 2, effectively preventing the combustion and explosion of the battery, and improving the safety of the battery.

[0073] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art of the present invention, according to the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A battery with a fire extinguishing function, characterized in that, Comprising: A housing having an accommodation cavity; A battery cell located in the accommodation cavity, with a first cavity in the middle of the battery cell and a second cavity between the circumferential outer wall of the battery cell and the circumferential inner wall of the housing; Wherein, a fire extinguishing bag is provided in the first cavity and the second cavity, the fire extinguishing bag includes a bag body and a fire extinguishing matrix located in the bag body, the bag body will be melted in a high-temperature environment to release the fire extinguishing matrix, and the fire extinguishing matrix is used for fire extinguishing and reducing the temperature of the battery cell.

2. The battery with a fire extinguishing function according to claim 1, characterized in that, Both the bag body and the fire extinguishing matrix are flexible bodies, the bag body abuts against the circumferential inner wall of the first cavity, and the bag body abuts against the circumferential inner wall of the second cavity.

3. The battery with a fire extinguishing function according to claim 2, characterized in that, The bag body abuts against the axial inner wall of the first cavity, and the bag body abuts against the axial inner wall of the second cavity.

4. The battery with a fire extinguishing function according to claim 3, characterized in that, The fire extinguishing bag fills the first cavity and the second cavity.

5. The battery with a fire extinguishing function according to claim 4, wherein, The fire extinguishing bags in the first cavity and the second cavity are in a compressed state.

6. The battery with a fire extinguishing function according to claim 1, characterized in that, The bag body is a thin film structure.

7. The battery with a fire extinguishing function according to claim 6, characterized in that, The bag body is an insulating and heat-conducting film.

8. The battery with a fire extinguishing function according to claim 1, wherein The melting point temperature of the bag body is 80°C - 100°C.

9. The battery with a fire extinguishing function according to claim 1, characterized in that, The first cavity is a hollow structure formed by winding the battery cell, and the fire extinguishing bag located in the first cavity is a columnar structure; and / or, the second cavity is an annular cavity surrounding the battery cell, and the fire extinguishing bag located in the second cavity is an annular structure.

10. A battery with a fire extinguishing function, characterized in that, Comprising: A housing having an accommodation cavity; A battery cell located in the accommodation cavity, with a first cavity in the middle of the battery cell and a second cavity between the circumferential outer wall of the battery cell and the circumferential inner wall of the housing; Wherein, a fire extinguishing bag is provided in the first cavity or the second cavity, the fire extinguishing bag includes a bag body and a fire extinguishing matrix located in the bag body, the bag body will be melted in a high-temperature environment to release the fire extinguishing matrix, and the fire extinguishing matrix is used for fire extinguishing and reducing the temperature of the battery cell.

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