battery

Abstract

This utility model relates to the field of new energy technology and discloses a battery. The battery includes: a battery casing, the battery casing including a first casing wall, the first casing wall being provided with an explosion-proof valve, the explosion-proof valve being provided with grooves suitable for enclosing and forming an opening area; a cell cavity formed inside the battery casing; a cell disposed within the cell cavity; and a fire extinguishing component disposed between the explosion-proof valve and the cell. In a direction perpendicular to the plane of the first casing wall, the distance between the fire extinguishing component and the opening area of ​​the explosion-proof valve is d1, and the distance between the fire extinguishing component and the cell is d2, satisfying: d1 < d2. The battery provided by this utility model, by further limiting d1 < d2, can ensure that the fire extinguishing component can function normally when the explosion-proof valve explodes, while also meeting the need to extinguish and cool more high-heat gases. It ensures that the fire extinguishing component can respond promptly in the event of battery thermal runaway, avoiding premature consumption of extinguishing materials and effectively covering the fire source, achieving efficient fire extinguishing and improving the overall safety performance of the battery.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, specifically to a battery. Background Technology

[0002] When a battery experiences thermal runaway, the electrolyte is a flammable substance and is prone to ignition. After the explosion-proof valve bursts, the burning electrolyte continues to spray out, which can easily affect adjacent batteries and cause them to be ignited, resulting in a high risk factor. Utility Model Content

[0003] In view of this, the present invention provides a battery to solve the problem that the electrolyte is prone to sparking when it is sprayed out.

[0004] This utility model provides a battery, comprising:

[0005] The battery casing includes a first casing wall, which is provided with an explosion-proof valve. The explosion-proof valve is provided with grooves, which are suitable for enclosing and forming an opening area. A cell cavity is formed inside the battery casing.

[0006] The battery cell is located inside the battery cell cavity;

[0007] Fire extinguishing components are located between the explosion-proof valve and the battery cell;

[0008] In the direction perpendicular to the plane containing the first shell wall, the distance between the fire extinguishing component and the opening area of ​​the explosion-proof valve is d1, and the distance between the fire extinguishing component and the battery cell is d2, satisfying: d1 < d2.

[0009] Beneficial effects: By further limiting d1 to d2, the fire extinguishing component can be guaranteed to function normally when the explosion-proof valve bursts, while also meeting the need to extinguish and cool more high-temperature gases. This ensures that the fire extinguishing component can respond promptly in the event of battery thermal runaway, avoiding premature consumption of extinguishing materials, effectively covering the fire source, achieving efficient fire extinguishing, and improving the overall safety performance of the battery. Attached Figure Description

[0010] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the battery of this utility model;

[0012] Figure 2 This is an exploded view of the battery of this utility model;

[0013] Figure 3 This is a cross-sectional view of the battery of this utility model;

[0014] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0015] Figure 5 for Figure 4 A schematic diagram after the battery cells have been removed;

[0016] Figure 6 This is a schematic diagram of the first shell wall and the fire extinguishing component of this utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Battery casing; 11. Cell cavity; 2. Cell; 3. First casing wall; 31. Explosion-proof valve;

[0019] 4. Fire extinguishing components; 41. Mounting bracket; 411. First through hole; 412. Fixing part; 413. Extension part; 414. Mounting part; 42. Fire extinguishing material component; 421. Second through hole; 423. Fire extinguishing substance. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] When a battery experiences thermal runaway, the electrolyte, being flammable, is prone to ignition. After the explosion-proof valve bursts, the burning electrolyte continues to spray out, sometimes reaching extremely high temperatures, even up to 1500°C, which can dissolve steel plates and easily affect adjacent batteries, posing a risk of ignition and creating significant challenges for integrated components. Furthermore, when the explosion-proof valve sprays towards the cockpit, it can endanger the user's safety, creating a substantial safety hazard. If the fire could be extinguished at its source, preventing the battery from igniting or reducing the fire to a very low level during a runaway, the problem of battery runaway danger would be solved more directly and fundamentally.

[0025] A battery casing includes a housing and a cover. The housing is used to encapsulate components such as the battery cell and electrolyte. The housing can come in various shapes and sizes, such as cuboid, cylindrical, and hexagonal prism. The shape of the housing is determined based on the specific shape and size of the battery cell. The housing can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, and aluminum alloy. The cover is a component that closes onto the opening of the housing to isolate the storage space from the external environment. The shape of the cover can be adapted to fit the shape of the housing. The cover can be made of a material with a certain degree of hardness and strength (such as aluminum alloy).

[0026] A battery cell is the smallest charging and discharging unit. A battery cell consists of a positive electrode, a negative electrode, and a separator between them, formed by winding or stacking. The positive electrode includes a positive current collector and a positive active material. The positive current collector can be made of metals such as aluminum foil, nickel foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The positive active material includes the main positive active material, a conductive agent, and a binder. The main positive active material includes one or more of lithium-containing positive active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate. Similarly, the negative electrode includes a negative current collector and a negative active material. The negative current collector can be made of metals such as copper foil, aluminum foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The negative active material includes the main negative active material, a conductive agent, and a binder. The main negative active material includes one or more of the main negative active materials such as artificial graphite, natural graphite, silicon carbide, silicon oxide, and lithium titanate. The tabs serve as the current output terminals of the battery cell, and are either integrally connected to the positive or negative electrode plates or connected separately. The separator, as an insulating layer, prevents short circuits within the battery cell caused by contact between the positive and negative electrode plates. Furthermore, as a semi-permeable layer, the separator prevents larger molecules from passing through while allowing smaller charged ions to pass.

[0027] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0028] According to an embodiment of the present invention, a battery is provided, comprising:

[0029] Battery housing 1 includes a first housing wall 3, the first housing wall 3 is provided with an explosion-proof valve 31, the explosion-proof valve 31 is provided with grooves, the grooves are suitable for enclosing and forming an opening area; a cell cavity 11 is formed inside the battery housing 1.

[0030] The battery cell 2 is disposed within the battery cell cavity 11. The battery cell 2 includes a battery cell body and a tab extending from the battery cell body.

[0031] Fire extinguishing component 4 is located between explosion-proof valve 31 and battery cell 2;

[0032] In the direction perpendicular to the plane where the first shell wall 3 is located, the distance between the fire extinguishing component 4 and the opening area of ​​the explosion-proof valve 31 is d1, and the distance between the fire extinguishing component 4 and the battery cell body is d2, satisfying: d1 < d2.

[0033] It should be noted that the explosion-proof valve 31 is provided with grooves. These grooves are designed to enclose and form an opening area. The grooves are located at the point where the explosion-proof valve is most likely to burst, usually in the thinnest area. These grooves are typically formed using methods such as laser cutting or stamping. When the internal pressure of the battery exceeds a preset value, the grooves rupture, and the opening area opens.

[0034] The cross-sectional shape of the notch can be V-shaped, U-shaped, or wavy, etc. The notch depth and width are reasonably set according to the material strength and opening pressure to ensure accurate opening under specific pressure.

[0035] In this embodiment, the first shell wall 3 can be one of the walls of the battery shell 1, or it can be a cover plate structure that is relatively independent of the main body of the battery shell 1. When the first shell wall 3 is one of the walls of the battery shell 1, the explosion-proof valve 31 is directly installed on that wall; when the first shell wall 3 is a cover plate structure, the explosion-proof valve 31 is installed on the cover plate. Regardless of the structure, it can ensure that the fire extinguishing component 4 can be activated rapidly under the high temperature and high pressure conditions inside the battery, effectively suppressing the spread of fire.

[0036] The battery casing 1 forms a cell cavity 11 inside, and the cell 2 is disposed inside the cell cavity 11.

[0037] Meanwhile, the fire extinguishing component 4 is located between the explosion-proof valve 31 and the battery cell 2. In the event of thermal runaway, the gas inside the battery will be ejected from the explosion-proof valve 31. That is, all the gas will pass through the location of the explosion-proof valve 31. By further aligning the location of the fire extinguishing component 4 with that of the explosion-proof valve 31, that is, designing the fire extinguishing component 4 in the path that the gas must pass through, it will be automatically activated by sensing temperature changes, releasing fire extinguishing substances to quickly cover the area around the explosion-proof valve 31 in the battery cell cavity 11, effectively covering the fire source, blocking the oxygen supply, intercepting and extinguishing the flames, thereby preventing the fire from spreading to adjacent batteries and ensuring the safety of the user.

[0038] In the direction perpendicular to the plane where the first shell wall 3 is located, the distance between the fire extinguishing component 4 and the opening area of ​​the explosion-proof valve 31 is d1. The smaller d1 is, the more gas can pass through the explosion-proof valve 31 when it is ejected. However, if d1 is too small, the pressure near the explosion-proof valve 31 will not be able to reflect the real pressure inside the battery, thereby affecting the sensing accuracy of the explosion-proof valve 31 and interfering with the normal opening of the explosion-proof valve 31.

[0039] In the direction perpendicular to the plane where the first shell wall 3 is located, the distance between the fire extinguishing component 4 and the battery cell body is d2. The smaller d2 is, the closer the fire extinguishing component 4 is to the battery cell 2. As the smallest unit for charging and discharging, the battery cell 2 has the highest internal temperature. Therefore, the smaller d2 is, the easier it is for the fire extinguishing material in the fire extinguishing component 4 to be volatilized by high temperature during normal charging and discharging of the battery. When the battery is in normal use, the volatilization of the fire extinguishing material to a certain extent can play a role in cooling. However, if d2 is too small, the distance between the fire extinguishing component 4 and the battery cell 2 will cause the fire extinguishing material to be consumed too quickly and volatilized. As a result, there will be no volatilized gas available when the explosion-proof valve 31 explodes.

[0040] In this embodiment, d1 < d2. Specifically, the value range of d1 can be 0.8mm-8mm, and the value range of d2 can be 0.9mm-8.5mm.

[0041] For example, in this embodiment, the value of d1 can be 0.8mm or 1mm or 1.5mm or 1.8mm or 2mm or 2.5mm or 3.2mm or 4.1mm or 4.8mm or 5mm or 5.3mm or 6mm or 8mm, or it can be any range formed by any two of the above values.

[0042] For example, in this embodiment, the value of d2 can be 0.9mm or 1mm or 1.5mm or 1.8mm or 2mm or 2.5mm or 3.2mm or 4.1mm or 4.8mm or 5mm or 5.3mm or 6mm or 7mm or 8mm or 8.5mm, or it can be any range formed by any two of the above values.

[0043] The battery provided in this embodiment, by further limiting d1 < d2, ensures that the fire extinguishing component 4 functions normally when the explosion-proof valve 31 explodes, while also meeting the need to extinguish and cool more high-temperature gases. This ensures that the fire extinguishing component 4 can respond promptly in the event of battery thermal runaway, avoiding premature consumption of extinguishing materials and effectively covering the fire source, achieving efficient fire extinguishing and improving the overall safety performance of the battery.

[0044] In some embodiments, the following condition is satisfied: 0.15≤d1 / d2≤0.95.

[0045] The battery provided in this embodiment, by further limiting the value of d1 / d2 to the above range, can ensure that the fire extinguishing component 4 accurately covers the fire source while ensuring the normal opening of the explosion-proof valve 31. This more accurately balances the fire extinguishing effect and the sensing sensitivity of the explosion-proof valve. At the same time, by reasonably selecting the ratio of d1 / d2, the fire extinguishing material can play a full role at critical moments, without waste or shortage, thereby extending the service life of the battery while ensuring its safety.

[0046] For example, in this embodiment, the value of d1 / d2 can be 0.15, 0.25, 0.3, 0.42, 0.51, 0.67, 0.82, or 0.95, or it can be any range formed by any two of the above values.

[0047] In some embodiments, combined with Figure 4 As shown, in the direction perpendicular to the plane where the first shell wall 3 is located, the fire extinguishing component 4 and the explosion-proof valve 31 are arranged opposite each other. The area of ​​the fire extinguishing component 4 is S1, and the area of ​​the opening area of ​​the explosion-proof valve 31 is S2, satisfying: 0.85≤S1 / S2≤4.

[0048] In a direction perpendicular to the plane where the first shell wall 3 is located, the fire extinguishing component 4 is positioned directly opposite the explosion-proof valve 31. This arrangement ensures that when the explosion-proof valve 31 explodes, the gas inside the battery will be ejected from the explosion-proof valve 31, meaning that all the gas will pass through the location of the explosion-proof valve 31, thus facilitating a rapid response from the fire extinguishing component 4, effectively covering the fire source, and preventing the fire from spreading.

[0049] By further limiting the values ​​of S1 / S2 to the above range, it can be ensured that the fire extinguishing component 4 covers the fire source without hindering the normal opening of the explosion-proof valve 31, thus ensuring a better balance between fire extinguishing effect and gas emission and improving overall safety performance.

[0050] For example, in this embodiment, the value of S1 / S2 can be 0.85 or 0.95 or 1 or 1.2 or 1.8 or 2.3 or 2.9 or 3.5 or 4, or it can be any range formed by any two of the above values.

[0051] In this embodiment, the value range of S1 can be 65mm. 2 -2600mm 2 The value of S2 can be in the range of 60mm. 2 -1250mm 2 .

[0052] For example, in this embodiment, the value of S1 can be 65mm. 2 Or 69mm 2 Or 165mm 2 Or 201mm 2 Or 352mm 2 Or 500mm 2 Or 630mm 2 Or 1010mm 2 Or 1591mm 2 Or 2500mm 2 Or 2600mm 2 "etc." can also be the range formed by any two of the above values.

[0053] For example, in this embodiment, the value of S2 can be 60mm. 2 Or 65mm 2 Or 69mm 2 Or 165mm 2 Or 201mm 2 Or 352mm 2 Or 500mm 2 Or 630mm 2 Or 1010mm 2 Or 1120mm 2 Or 1210mm 2 Or 1250mm 2"etc." can also be the range formed by any two of the above values.

[0054] In some embodiments, the fire extinguishing component 4 has a through hole in the area where the projection of the fire extinguishing component 4 toward the explosion-proof valve 31 coincides with the opening area of ​​the explosion-proof valve 31.

[0055] By creating a through hole in the area where the fire extinguishing component 4 is projected toward the explosion-proof valve 31 and overlaps with the explosion-proof valve 31, the fire extinguishing component 4 can be facilitated to smoothly discharge gas, avoid the accumulation of high-pressure gas, avoid interference with the normal operation of the explosion-proof valve 31, and reduce the impact on the fire extinguishing component 4.

[0056] As a further option, the projection of the fire extinguishing assembly 4 toward the explosion-proof valve 31 in a direction perpendicular to the plane of the first housing wall 3 covers the explosion-proof valve 31. This improves fire extinguishing efficiency and prevents the fire from spreading to the outside of the battery.

[0057] In some embodiments, combined with Figure 5 As shown, the fire extinguishing assembly 4 includes a mounting bracket 41 and a fire extinguishing material component 42 mounted on the mounting bracket 41, wherein the fire extinguishing material component 42 is adapted to be filled with fire extinguishing substance 423;

[0058] The vias include a first via 411 formed in the mounting bracket 41 and a second via 421 formed in the fire extinguishing material component 42;

[0059] In a direction perpendicular to the plane of the first shell wall 3, the first through hole 411 and the second through hole 421 are at least partially overlapped.

[0060] The fire extinguishing assembly 4 includes a mounting bracket 41 for securing the fire extinguishing material component 42. The mounting bracket 41 has a first through hole 411 to ensure smooth flow of high-pressure gas when the fire extinguishing material 423 is released, preventing blockage of the explosion-proof valve 31 and avoiding the risk of explosion due to gas accumulation.

[0061] Since the high-pressure gas also needs to pass through the extinguishing material component 42 during ejection, a second through hole 421 is also provided in the area corresponding to the first through hole 411 in the extinguishing material component 42 to ensure smooth gas passage. This reduces gas flow resistance and improves extinguishing efficiency while meeting fire extinguishing requirements.

[0062] By setting the first through hole 411 and the second through hole 421 to at least partially overlap, the gas flow resistance is effectively reduced, ensuring that the extinguishing material 423 quickly covers the fire source, while avoiding interference with the explosion-proof valve 31, thereby further improving the overall safety and reliability of the fire extinguishing system.

[0063] In some embodiments, combined with Figure 5As shown, in the direction perpendicular to the plane where the first shell wall 3 is located, the first through hole 411 and the second through hole 421 coincide.

[0064] By aligning the first through hole 411 with the second through hole 421, the exhaust effect can be better guaranteed, ensuring that high-pressure gas is discharged quickly, effectively reducing gas flow resistance, avoiding safety hazards caused by gas accumulation, and facilitating the uniform distribution of extinguishing materials so as to quickly extinguish the fire.

[0065] In some embodiments, combined with Figure 4 As shown, the fire extinguishing component 4 is installed on the first shell wall 3.

[0066] By installing the fire extinguishing component 4 on the first housing wall 3, which in this embodiment can be a cover plate structure, that is, installing the fire extinguishing component 4 on the inside of the cover plate structure, it is easy to ensure the precise relative position of the fire extinguishing component 4 and the explosion-proof valve 31, so that the high-pressure gas can be smoothly discharged through the first through hole 411 and the second through hole 421, further improving the fire extinguishing efficiency, preventing the spread of fire, and ensuring battery safety.

[0067] In some embodiments, the mounting bracket 41 is insulated from the first shell wall 3; the fire extinguishing material component 42 is disposed on the side of the mounting bracket 41 opposite to the first shell wall 3.

[0068] The mounting bracket 41 is insulated from the first shell wall 3 to avoid secondary disasters caused by current conduction and to ensure the safety and reliability of the fire extinguishing process.

[0069] In some optional embodiments, the mounting bracket 41 is made of a material with surface insulation properties, such as high-strength, heat-resistant plastic; the mounting bracket 41 may also undergo surface insulation treatment, such as cationic oxidation or spraying; thereby improving the insulation effect of the mounting bracket 41, preventing it from acting as a conductive medium and causing short circuits, and ensuring the safe operation of the fire extinguishing system in complex environments. Simultaneously, the insulation treatment also prevents the extinguishing agent 423 from chemically reacting with the mounting bracket 41, extending its service life.

[0070] Since the temperature inside the battery is higher than that outside the battery, the fire extinguishing component 4 is located on the side of the first shell wall 3 facing the cell cavity 11, so that it can play a timely fire extinguishing role.

[0071] Furthermore, the fire extinguishing material component 42 is positioned on the side of the installation part 414 away from the first shell wall 3, ensuring that the fire extinguishing material component 42 contacts the fire source before the installation bracket 41, and initiates fire extinguishing first. This ensures that the fire extinguishing substance 423 is rapidly released near the fire source, effectively covering the burning area, blocking the spread of fire, and improving the overall structure's fire extinguishing response speed and reliability.

[0072] The fixing part 412 is welded or glued to the side surface of the first shell wall 3 facing the cell cavity 11.

[0073] In some embodiments, the fire extinguishing material component 42 includes a wrapping layer and a fire extinguishing substance 423, the wrapping layer being adapted to wrap around the exterior of the fire extinguishing substance 423.

[0074] In this embodiment, the extinguishing agent 423 can be perfluorohexanone, which is liquid at room temperature. After the extinguishing agent 423 is wrapped by the coating layer, it can maintain a stable form, is not easy to volatilize, and is easy to fix.

[0075] Perfluorohexanone has a melting point of 30°C to 90°C, ensuring it remains liquid at room temperature for easy storage and use. When the temperature rises to its melting point range, perfluorohexanone rapidly vaporizes, effectively covering the fire source, quickly suppressing the spread of flames, cooling the flames, and improving fire extinguishing efficiency.

[0076] Meanwhile, the low toxicity and environmentally friendly properties of perfluorohexanone mean that it has a relatively small impact on human health and the environment during fire extinguishing, meeting modern safety and environmental protection requirements.

[0077] The encapsulation layer is suitable for encapsulating the extinguishing substance 423. That is, the extinguishing material component 42 can be constructed as a capsule-shaped structure, presenting a capsule state in which the encapsulation layer 422 encapsulates the extinguishing substance 423. When the encapsulation layer 422 material is heated, it begins to soften in order to release the substance inside the capsule. The perfluorohexanone extinguishing gas that is heated and vaporized can isolate the air, thereby quickly extinguishing the fire source.

[0078] The method for manufacturing the fire extinguishing material component 42 in this embodiment is as follows: gelatin and montmorillonite are dissolved in pure water to obtain a dispersion, sodium polyphosphate is dissolved in pure water to obtain a coagulation liquid, liquid perfluorohexanone is first added to the dispersion and dispersed evenly, and then the coagulation liquid is added and stirred to form an inner shell layer. Polyisocyanate is first added to the liquid perfluorohexanone that forms the inner shell layer for curing, and phenolic prepolymer is added for curing to form an outer shell layer. After washing, filtering and drying, perfluorohexanone fire extinguishing microcapsules are made.

[0079] In some embodiments, combined with Figure 5 As shown, the mounting bracket 41 includes:

[0080] The fixing part 412 is adapted to be fixed to the first shell wall 3;

[0081] Mounting part 414, fire extinguishing material component 42 is adapted to be installed in mounting part 414;

[0082] An extension portion 413 is provided between the fixing portion 412 and the mounting portion 414 so that the fire extinguishing material component 42 and the explosion-proof valve 31 are spaced apart.

[0083] By providing an extension 413 between the fixing part 412 and the mounting part 414, the fire extinguishing material component 42 and the explosion-proof valve 31 can be spaced apart, thereby ensuring the distance d1 between the fire extinguishing assembly 4 and the explosion-proof valve 31. This prevents interference with the normal opening of the explosion-proof valve 31, ensuring that it can quickly release pressure in an emergency and avoiding malfunctions caused by physical contact. Simultaneously, the mounting bracket 41 has a first through hole 411, and the fire extinguishing material component 42 has a second through hole 421 corresponding to the area of ​​the first through hole 411. This ensures smooth gas flow during high-pressure gas ejection, allowing the gas to quickly reach the explosion-proof valve 31 and effectively reducing the risk of gas accumulation.

[0084] In some embodiments, combined with Figure 6 As shown, in a direction parallel to the plane of the first shell wall 3, at least a portion of the fire extinguishing component 4 is perforated to create an exhaust channel between the first shell wall 3 and the fire extinguishing component 4. By creating a perforated area in a direction parallel to the plane of the first shell wall 3 to form an exhaust channel, airflow is increased, ensuring unobstructed airflow for smooth exhaust. This reduces internal pressure buildup and improves fire extinguishing efficiency.

[0085] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A battery, characterized in that, include: The battery casing (1) includes a first casing wall (3), the first casing wall (3) is provided with an explosion-proof valve (31), the explosion-proof valve (31) is provided with grooves, the grooves are adapted to enclose and form an opening area; the battery casing (1) forms a cell cavity (11) inside; A battery cell (2) is disposed in the battery cell cavity (11), and the battery cell (2) includes a battery cell body and a tab extending from the battery cell body; Fire extinguishing assembly (4) is disposed between the explosion-proof valve (31) and the battery cell (2); In the direction perpendicular to the plane where the first shell wall (3) is located, the distance between the fire extinguishing component (4) and the opening area of ​​the explosion-proof valve (31) is d1, and the distance between the fire extinguishing component (4) and the battery cell body is d2, satisfying: d1 < d2.

2. The battery according to claim 1, characterized in that, It satisfies: 0.15≤d1 / d2≤0.

95.

3. The battery according to claim 1, characterized in that, In a direction perpendicular to the plane of the first shell wall (3), the fire extinguishing component (4) and the explosion-proof valve (31) are arranged opposite each other. The area of ​​the fire extinguishing component (4) is S1, and the area of ​​the opening area of ​​the explosion-proof valve (31) is S2, satisfying: 0.85≤S1 / S2≤4.

4. The battery according to claim 1, characterized in that, In the area where the fire extinguishing component (4) is projected toward the explosion-proof valve (31) and coincides with the opening area of ​​the explosion-proof valve (31), the fire extinguishing component (4) has a through hole.

5. The battery according to claim 4, characterized in that, The fire extinguishing assembly (4) includes a mounting bracket (41) and a fire extinguishing material component (42) mounted on the mounting bracket (41), wherein the fire extinguishing material component (42) is adapted to be filled with fire extinguishing substance (423); The through hole includes a first through hole (411) formed in the mounting bracket (41) and a second through hole (421) formed in the fire extinguishing material component (42); In a direction perpendicular to the plane of the first shell wall (3), the first through hole (411) and the second through hole (421) are at least partially overlapped.

6. The battery according to claim 5, characterized in that, In a direction perpendicular to the plane of the first shell wall (3), the first through hole (411) coincides with the second through hole (421).

7. The battery according to claim 5, characterized in that, The fire extinguishing component (4) is installed on the first shell wall (3).

8. The battery according to claim 7, characterized in that, The mounting bracket (41) is insulated from the first shell wall (3); the fire extinguishing material component (42) is disposed on the side of the mounting bracket (41) away from the first shell wall (3).

9. The battery according to claim 5, characterized in that, The fire extinguishing material component (42) includes a wrapping layer (422) and a fire extinguishing substance (423), wherein the wrapping layer (422) is adapted to wrap around the outside of the fire extinguishing substance (423).

10. The battery according to claim 5, characterized in that, The mounting bracket (41) includes: The fixing part (412) is adapted to be fixed to the first shell wall (3); Mounting part (414), wherein the fire extinguishing material component (42) is adapted to be mounted on the mounting part (414); An extension (413) is provided between the fixing part (412) and the mounting part (414) so ​​that the fire extinguishing material component (42) and the explosion-proof valve (31) are spaced apart.

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