Battery having fire-extinguishing function

Abstract

Disclosed in the present invention is a battery having a fire-extinguishing function. The battery comprises: a case; and a battery cell, which is located in an accommodating cavity, wherein a first cavity is provided in the central portion of the battery cell, and a second cavity is provided between a circumferential outer side wall of the battery cell and a circumferential inner side wall of the case, and a fire-extinguishing pouch is provided in each of the first cavity and the second cavity, each fire-extinguishing pouch comprising a pouch body and a fire-extinguishing substrate located in the pouch body. Since the fire-extinguishing pouch is provided at each of a central position and an edge position inside the battery and each fire-extinguishing pouch comprises a pouch body and a fire-extinguishing substrate located in the pouch body, when the battery cell heats up and catches fire, the pouch body of each fire-extinguishing pouch melts and releases the fire-extinguishing substrate, and the fire-extinguishing substrate can extinguish the fire and cool down the battery cell. The fire-extinguishing pouches are provided inside the battery, such that cooling and fire extinguishing can be performed at the early stages of temperature runaway and fire ignition inside the battery, thereby preventing the battery's thermal runaway from spreading further and causing an explosion or deflagration, and thus reducing the risk of fire spreading and ensuring the safety of individuals and property.

Description

A battery with fire extinguishing function Technical Field

[0001] This invention relates to the field of battery safety technology, and specifically to a battery with fire extinguishing function. Background Technology

[0002] Batteries, as a crucial component of current new energy development, are widely used in various electronic products, photovoltaics, energy storage, automobiles, and electrical equipment. With continuous technological advancements, batteries have evolved into a variety of rechargeable types, such as lead-acid batteries, lithium-ion batteries, and sodium-ion batteries. Lithium-ion batteries are currently the mainstream product, further categorized by cathode materials into lithium iron phosphate batteries, ternary lithium batteries, lithium cobalt oxide batteries, and polymer lithium-ion batteries. Although the performance of each type of battery differs, they all share a common drawback: the battery materials themselves are active substances, prone to explosion, combustion, and the production of large amounts of dense smoke during thermal runaway. This drawback is unpredictable and difficult to control during use, easily leading to personal injury and property damage. While battery manufacturers, battery pack manufacturers, and users strive to improve battery safety, a 100% guarantee is difficult to achieve. Therefore, the safety of batteries themselves must be taken seriously.

[0003] Currently, battery and battery pack safety is primarily addressed through battery management and thermal management, supplemented by fire extinguishing devices. Battery management prevents overcharging, over-discharging, overheating, and short circuits during use. Thermal management prevents thermal runaway caused by high or low temperatures, extreme temperature fluctuations, and uneven temperature distribution. Fire extinguishing devices are used to extinguish fires that occur when a battery or battery pack experiences thermal runaway, resulting in explosion or combustion. Even with these multiple layers of protection, battery accidents are difficult to completely prevent. This is because battery explosions and combustions typically occur within a very short time, leaving insufficient post-explosion reaction time, and external fire extinguishing and cooling effects are often ineffective and prone to reignition. Furthermore, the application environment of batteries is difficult to stabilize, and battery explosions and combustions can be caused by external forces such as impacts, compression, or drops. Therefore, this randomness makes it difficult to ensure the inherent safety and reliability of the battery itself, as well as its rapid response. Summary of the Invention

[0004] The purpose of this invention is to provide a battery with fire extinguishing function, which can quickly and effectively extinguish and cool the battery in the early stages of temperature runaway and fire, prevent the battery thermal runaway from further expanding and causing explosion and deflagration, thereby reducing the risk of fire spread and ensuring personal and property safety.

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

[0006] A housing having a receiving cavity;

[0007] The battery cell is located within the accommodating cavity, and the battery cell has a first cavity in its middle portion, and a second cavity is formed between the outer circumferential wall of the battery cell and the inner circumferential wall of the housing.

[0008] The first cavity and the second cavity are equipped with fire extinguishing bags. Each fire extinguishing bag includes a bag body and a fire extinguishing matrix located inside the bag body. The bag body will be melted and release the fire extinguishing matrix under high temperature conditions. The fire extinguishing matrix is ​​used to extinguish fire and reduce the temperature of the battery cell.

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

[0010] In one embodiment, the capsule abuts against the axial inner wall of the first cavity, and the capsule 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 capsule is a thin film structure.

[0014] In one embodiment, the capsule is an insulating and thermally conductive film.

[0015] In one embodiment, the melting point temperature of the capsule 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 fire extinguishing function is provided, comprising:

[0018] A housing having a receiving cavity;

[0019] The battery cell is located within the accommodating cavity, and the battery cell has a first cavity in its middle portion, and a second cavity is formed between the outer circumferential wall of the battery cell and the inner circumferential wall of the housing.

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

[0021] The battery with fire extinguishing function according to the above embodiment has fire extinguishing bladders located in the center and at the edges inside the battery. Each fire extinguishing bladder includes a bladder body and a fire extinguishing matrix located within the bladder body. When the battery cell heats up and catches fire, the bladder body melts and releases the fire extinguishing matrix, which extinguishes the fire and cools the battery cell. The presence of fire extinguishing bladders inside the battery allows for cooling and fire extinguishing in the event of temperature runaway or initial fire, preventing further thermal runaway from causing explosion or deflagration, thereby reducing the risk of fire spread and ensuring personal and property safety.

[0022] Furthermore, the fire extinguishing bag is located in the middle of the battery cell winding and in the gap between the battery cell and the casing. The fire extinguishing bag makes full use of the space gap originally generated during battery production design, which can reduce the cost of developing and designing batteries with fire extinguishing function, as well as reduce production costs. At the same time, after the fire extinguishing bag fills the gap inside the battery, the battery cell inside the battery is installed more stably and can resist greater impact forces, which helps to improve the battery's impact resistance safety. Attached Figure Description

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

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

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

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

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

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

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

[0030] The accompanying diagrams are labeled as follows:

[0031] 1-Shell, 11-Accommodating 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 ear;

[0035] 5- Negative electrode ear. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0037] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0038] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0039] In one embodiment, a battery with fire extinguishing function is provided. The battery's cell material is not limited; it can include, but is not limited to, lead-acid batteries, lithium-ion batteries, and sodium-ion batteries. The battery contains a fire extinguishing bladder located inside. This bladder can detect temperature increases and fires within the battery in the initial stages of these events, cooling and extinguishing the fire to prevent further thermal runaway and potential explosion or deflagration. This reduces the risk of fire spread and ensures personal and property safety.

[0040] The fire extinguishing bag in this embodiment is a flexible bag structure, which is set in the gap space formed by the winding of the battery cell and in the gap space between the battery cell and the shell. 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 fill the two gap spaces in the battery without the need to set other accommodating spaces to prevent fire extinguishing materials, which can reduce the development, design and production costs of the battery.

[0041] The fire extinguishing bag in this embodiment can also act as a buffer, improve the stability of the battery cell installation, and help improve the battery's impact resistance safety.

[0042] Please refer to Figures 1 to 3. The battery with fire extinguishing function in this embodiment mainly includes a casing 1, a battery cell 2, and a fire extinguishing bladder 3. The battery also includes a positive electrode tab 4 and a negative electrode tab 5.

[0043] The housing 1 has a cylindrical structure and can be formed by two end panels and a cylindrical plate. The housing 1 has a cavity 11, which is a hollow cylindrical cavity. The positive electrode 4 is installed on one axial end face of the housing 1, and the negative electrode 5 is installed on the other axial end face of the housing 1. The positive electrode 4 and the negative electrode 5 serve as the positive and negative terminals of the battery and are used for electrical connection to an external circuit.

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

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

[0046] There is a gap space between the outer circumferential wall of the cell 2 and the inner circumferential wall inside the casing 1. This gap space forms a second cavity 22, which is an annular cavity.

[0047] The two ends of the battery cell 2 abut against the inner sidewall of the housing 1, respectively, so that the battery cell 2 can be connected to the positive electrode 4 and the negative electrode 5. The battery cell 2 and the housing 1 have no gap space in the axial direction, which can improve the stability of the axial position of the battery cell 2.

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

[0049] During battery production, due to process and installation requirements, gap spaces are formed in the middle of the battery cell 2 and between the battery cell 2 and the casing 1. Based on this, a first cavity 21 and a second cavity 22 are formed. The fire extinguishing bag 3 is designed as a flexible body, which can effectively adapt to the first cavity 21 and the second cavity 22, allowing the fire extinguishing bag 3 to be installed in a filling manner within the first cavity 21 and the second cavity 22. The fire extinguishing bag 3 is fixed within the first cavity 21 and the second cavity 22 by expansion and compression, eliminating the need for an additional installation structure for the fire extinguishing bag 3. Furthermore, the flexible fire extinguishing bag 3 has a shock-absorbing function. The fire extinguishing bag 3 forms a protective area; when the battery is subjected to external impact, the fire extinguishing bag 3 can absorb vibration and reduce impact force, preventing combustion and explosion caused by external forces such as compression, impact, puncture, and vibration.

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

[0051] For ease 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 disposed in the first cavity 21, and the second fire extinguishing bag 3b is disposed in the second cavity 22. The shape of the first fire extinguishing bag 3a is adapted to the shape of the first cavity 21, and the first fire extinguishing bag 3a has a cylindrical structure; the shape of the second fire extinguishing bag 3b is adapted to the shape of the second cavity 22, and the second fire extinguishing bag 3b has a ring 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 matrix 32 made 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 matrix 32 with different shapes.

[0053] The capsule 31 has a thin-film structure and is made of a material that is resistant to electrolyte corrosion, insulating, does not chemically react with the battery cell 2 material, and has different temperature ratings. For example, the capsule 31 is a plastic film or a polymer film. The extinguishing matrix 32 is an extinguishing agent, which includes, but is not limited to, gases, liquids, and solids and their combinations. The extinguishing matrix 32 includes functional materials that extinguish fires, cool down, and isolate oxygen.

[0054] In this embodiment, the capsule 31 is made of a material with a melting point of 80°C-100°C, preferably 80°C or close to 80°C. The battery cell 2 operates normally below 80°C; if the battery cell 2 exceeds 80°C, it indicates that the battery cell 2 is experiencing heat loss, and further heating will lead to combustion and explosion. Therefore, the capsule 31, with a melting point of 80°C-100°C, can melt and release the fire extinguishing matrix 32 in the initial stage of battery cell 2 heating to cool and extinguish the fire, preventing potential hazards.

[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 larger 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 wall of the first cavity 21, that is, the circumferential outer wall of the first fire extinguishing bag 3a abuts against the circumferential inner wall of the middle part 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 larger 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 wall of the second cavity 22, that is, the circumferential inner wall of the second fire extinguishing bag 3b abuts against the circumferential outer wall of the battery cell 2, and the circumferential outer wall of the second fire extinguishing bag 3b abuts against the circumferential inner wall of the shell 1. With this configuration, 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 body 31 of the first fire extinguishing bag 3a and the second fire extinguishing bag 3b melts can be quickly sprayed out to achieve cooling and fire extinguishing.

[0056] The battery with fire extinguishing function in this embodiment has fire extinguishing bags 3 located in the center and at the edges inside the battery. Each fire extinguishing bag 3 includes a bag body 31 and a fire extinguishing matrix 32 located within the bag body 31. When the battery cell 2 experiences temperature rise and fire, the bag body 31 of the fire extinguishing bag 3 will melt and release the fire extinguishing matrix 32, which can extinguish the fire and cool down the battery cell 2. The presence of fire extinguishing bags 3 inside the battery allows for cooling and fire extinguishing in the event of temperature runaway or initial fire, preventing further thermal runaway from causing explosion or deflagration, thereby reducing the risk of fire spread and ensuring personal and property safety.

[0057] The fire extinguishing bag 3 is located in the middle gap formed by the winding of the battery cell and in the gap between the battery cell 2 and the casing 1. The fire extinguishing bag 3 makes full use of the space gap originally generated during the battery production design, which can reduce the cost of developing and designing batteries with fire extinguishing function and also reduce production costs. At the same time, after the fire extinguishing bag 3 fills the gap inside the battery, the battery cell inside the battery is installed more stably and can withstand greater impact forces, which helps to improve the battery's impact resistance safety.

[0058] The second fire extinguishing bag 3b is disposed in the second cavity 22, forming a protective area on the circumferential outer side of the battery cell 2. When external heat enters the battery, the second fire extinguishing bag 3b can play a role in cooling and heat insulation, preventing external heat from affecting the battery cell 2.

[0059] In one embodiment, the fire extinguishing bag 3 abuts against the circumferential inner wall of the first cavity 21 and the second cavity 22, and the fire extinguishing bag 3 also abuts against the axial inner wall of the first cavity 21 and the second cavity 22, which increases the contact area between the fire extinguishing bag 3 and the inner wall of the first cavity 21 and the second cavity 22, thereby improving the sensitivity of the fire extinguishing bag 3 to induction melting and also improving 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. After the first cavity 21 and the second cavity 22 are filled with the fire extinguishing bag 3, there is no gap space. The fire extinguishing bag 3 abuts against the inner sidewalls of the first cavity 21 and the second cavity 22 in the circumferential and axial directions.

[0061] The first cavity 21 and the second cavity 22 are filled with fire extinguishing bags 3, which can further improve the fire extinguishing and buffering effects of fire extinguishing bags 3.

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

[0063] The bladder 31 has a thermal conductivity. When the bladder 31 of the fire extinguishing bladder 3 is not melted, it can effectively cool the battery cell 2, so that when the temperature rise of the battery cell 2 is small, it returns to the normal operating temperature range, and the battery cell 2 can continue to work normally, thereby improving the battery's service life.

[0064] In one embodiment, the battery can also be of other shapes, such as oval, square, and pouch batteries, among others. Different battery shapes may also have a first cavity 21 in the center to house the first fire extinguishing bag 3a, and a second cavity 22 at the circumferential edge to house the second fire extinguishing bag 3b. In other words, the placement of fire extinguishing bags 3 at the center and edge of the battery is not limited to the battery's shape; fire extinguishing bags 3 can be placed in batteries of various shapes to achieve both heating and initial cooling / extinguishing of a fire.

[0065] As shown in Figure 4, the battery can be an elliptical battery or a square battery. The axial cross-section of the elliptical or square battery is elliptical or racetrack-shaped, and the battery cell 2 is wound into the corresponding elliptical 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 semicircular ends, and the axial cross-section of the second cavity 22 between the battery cell 2 and the casing 1 is racetrack-shaped.

[0066] The first fire extinguishing bag 3a is configured with a shape corresponding to the first cavity 21, and its axial cross-section is a long strip with semi-circular ends. The second fire extinguishing bag 3b is configured with a shape corresponding to the second cavity 22, and its axial cross-section is racetrack-shaped.

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

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

[0069] In one embodiment, a battery with fire extinguishing function is provided. The difference between the battery in this embodiment and any of the above embodiments is 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 bag 3 is provided inside the battery 2. The fire extinguishing bag 3 is the first fire extinguishing bag 3a in the above embodiment. The battery is provided with a first cavity 21, and the first fire extinguishing bag 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, the first fire extinguishing bag 3a is provided only in the middle of the battery cell 2. It can also conduct heat and extinguish fire for the battery cell 2, which can effectively prevent the battery from burning and exploding and improve the safety of the battery.

[0072] Referring to Figure 7, in other embodiments, the fire extinguishing bag 3 is the second fire extinguishing bag 3b in the above embodiments. The battery has a second cavity 22, and the second fire extinguishing bag 3b is disposed in the second cavity 22 in the middle of the battery cell 2. The second fire extinguishing bag 3b is only provided on the circumferential edge inside the battery cell 2, which can also play a role in heat insulation, buffering and fire extinguishing of the battery cell 2, effectively preventing the battery from burning and exploding, and improving the battery safety.

[0073] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A battery with fire extinguishing function, characterized in that, include: A housing having a receiving cavity; The battery cell is located within the accommodating cavity, and the battery cell has a first cavity in its middle portion, and a second cavity is formed between the outer circumferential wall of the battery cell and the inner circumferential wall of the housing. The first cavity and the second cavity are equipped with fire extinguishing bags. Each fire extinguishing bag includes a bag body and a fire extinguishing matrix located inside the bag body. The bag body will be melted and release the fire extinguishing matrix under high temperature conditions. The fire extinguishing matrix is ​​used to extinguish fire and reduce the temperature of the battery cell.

2. The battery with fire extinguishing function as described in claim 1, characterized in that, Both the bladder and the extinguishing matrix are flexible bodies. The bladder abuts against the inner circumferential wall of the first cavity and the inner circumferential wall of the second cavity.

3. The battery with fire extinguishing function as described in claim 2, characterized in that, The capsule abuts against the axial inner wall of the first cavity, and the capsule abuts against the axial inner wall of the second cavity.

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

5. The battery with fire extinguishing function as described in claim 4, characterized in that, The fire extinguishing bags in the first cavity and the second cavity are in a compressed state.

6. The battery with fire extinguishing function as described in claim 1, characterized in that, The capsule has a thin film structure.

7. The battery with fire extinguishing function as described in claim 6, characterized in that, The capsule is an insulating and thermally conductive film.

8. The battery with fire extinguishing function as described in claim 1, characterized in that, The melting point of the capsule is 80℃-100℃.

9. The battery with fire extinguishing function as described in 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 fire extinguishing function, characterized in that, include: A housing having a receiving cavity; The battery cell is located within the accommodating cavity, and the battery cell has a first cavity in its middle portion, and a second cavity is formed between the outer circumferential wall of the battery cell and the inner circumferential wall of the housing. The first cavity or the second cavity is provided with a fire extinguishing bag. The fire extinguishing bag includes a bag body and a fire extinguishing matrix located inside the bag body. The bag body will be melted and release the fire extinguishing matrix in a high-temperature environment. The fire extinguishing matrix is ​​used to extinguish fire and reduce the temperature of the battery cell.

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