Battery, battery pack, and electric device

Abstract

The utility model relates to a kind of battery, battery pack and electric equipment.Battery includes shell, battery cell and support component.Shell includes wall portion in the first direction one side, wall portion is equipped with explosion-proof valve, battery cell is located in shell, support component includes first support and first insulating piece, first support is located between wall portion and battery cell in the first direction, first insulating piece is located between first support and battery cell in the first direction.The size of first insulating piece in the first direction is h1, the size of first support in the first direction is h2, the melting temperature of first insulating piece is k1, the melting temperature of first support is k2, k1<k2, and 380≤(k2-k1)×h2 / h1≤15500.Battery defined according to the above numerical range can not only ensure the insulation effect of first support and battery cell, but also limit the position of battery cell, avoid its block explosion-proof valve.

Description

Technical Field

[0001] The present utility model relates to the technical field of batteries, and in particular, relates to a battery, a battery pack and an electric device. Background Art

[0002] In existing battery structures, the explosion-proof valve is a key component for ensuring battery safety, and is used to quickly release pressure when the internal pressure of the battery rises abnormally (such as during thermal runaway) to prevent the casing from bursting. However, when the battery is subjected to vibration or impact during charging and discharging or transportation, the internal cell may be displaced, causing the cell or related components to block or even clog the explosion-proof valve, which affects the pressure relief of the explosion-proof valve. Once the explosion-proof valve cannot be opened normally and the internal pressure cannot be released in time, it may cause battery swelling, liquid leakage or even explosion, posing a major safety hazard. Contents of Utility Model

[0003] In view of this, the present utility model provides a battery, a battery pack and an electric device, which aim to ensure the opening conditions of the explosion-proof valve and improve the safety and stability of the battery.

[0004] The battery provided by the present utility model includes a casing, a cell and a support assembly. The casing includes a wall portion located on one side in a first direction, the wall portion is provided with an explosion-proof valve, the cell is arranged in the casing, the support assembly includes a first support member and a first insulating member, the first support member is located between the wall portion and the cell in the first direction, and the first insulating member is located between the first support member and the cell in the first direction. The dimension of the first insulating member in the first direction is h1, in mm, the dimension of the first support member in the first direction is h2, in mm, the melting temperature of the first insulating member is k1, in °C, the melting temperature of the first support member is k2, in °C, k1<k2, and 380≤(k2-k1)×h2 / h1≤15500.

[0005] The beneficial effects of the battery provided by the present utility model are as follows:

[0006] For the battery defined according to the above numerical range, the heat generated during charging and discharging is not likely to cause the first support member to melt, so the first support member can limit the displacement of the cell, prevent the cell from moving to a position blocking the explosion-proof valve, thereby ensuring the safety performance of the battery. In addition, during the charging and discharging process of the battery, the first insulating member can ensure its stability and avoid short circuit caused by the contact between the first support member and the cell.

[0007] In a second aspect, the battery pack provided by the present utility model includes the battery according to the first aspect.

[0008] In a third aspect, the electric device provided by the present utility model includes the battery pack according to the second aspect. Brief Description of the Drawings

[0009] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0010] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0011] It should also be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0012] It should also be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0013] Figure 1 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0014] Figure 2 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present invention.

[0015] Figure 3 This is a schematic diagram of the structure of a battery according to an embodiment of the present invention.

[0016] Figure 4 yes Figure 3 A schematic diagram of the battery in the image.

[0017] Figure 5 yes Figure 3 A cross-sectional view of a portion of the battery.

[0018] Figure 6 yes Figure 3 A cross-sectional view of a portion of the battery.

[0019] Figure 7 yes Figure 3 A schematic diagram of a portion of the battery.

[0020] Figure 8 This is a schematic diagram of a portion of a battery according to a first variation of the present invention.

[0021] Figure 9 This is a schematic diagram of a portion of a battery according to a second variation of the present invention.

[0022] Explanation of reference numerals in the attached drawings: Battery-100; Casing-10; Wall-11; Explosion-proof valve-12; Cell-20; Cell body-21; Tab-22; First tab-221; Second tab-222; Support assembly-30; First support member-31; Through hole-311; First insulating member-32; First support assembly-33; Second support assembly-34; Third support assembly-35; Fourth support assembly-36; Terminal post-40; Adapter piece-50; Second insulating member-60; First vent-61; Second support member-70; Second vent-71; Battery pack-200; Electrical equipment-300. Detailed Implementation

[0023] The embodiments of the present invention will now be described by way of example with reference to the accompanying drawings. It should be understood that there are many ways to implement the present invention, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of the present invention.

[0024] <Example Electrical Equipment>

[0025] refer to Figure 1 This utility model provides an electrical device 300, which includes a battery pack 200.

[0026] By way of example only, electrical equipment 300 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, engineering vehicles, etc.

[0027] In addition, electrical equipment 300 can also be used for the storage, conversion and release of recyclable electrical energy.

[0028] In a non-limiting example, referring to the figure, electrical device 300 can be an electric vehicle 300, and battery pack 200 can be used as a power source to provide power to the electric vehicle 300.

[0029] <Example Battery Pack>

[0030] refer to Figure 1 and Figure 2 The battery pack 200 provided in this embodiment of the present invention includes a plurality of batteries 100 or a plurality of batteries 100a or a plurality of batteries 100b.

[0031] <Example Battery>

[0032] refer to Figure 3 and Figure 4 The battery 100 provided by this utility model includes a casing 10 and a battery cell 20.

[0033] The housing 10 includes a housing body 13 and a wall portion 11. The housing body 13 includes an opening 131 opening to one side facing a first direction and a receiving cavity 132, the receiving cavity 132 accommodating the battery cell 20. The wall portion 11 closes the opening 131 to isolate the battery cell 20 from the external environment. It should be noted that, in the current embodiment, the wall portion 11 is a cover plate of the battery 100. In some other embodiments, the wall portion 11 may also be other parts of the housing 10.

[0034] For example, the material of the housing 10 may be one or more of copper, iron, aluminum, stainless steel, aluminum alloy, plastic and aluminum-plastic film, and the present invention does not impose any particular limitation on this.

[0035] Cell 20 is the component in battery 100 where electrochemical reactions occur, and it is also the smallest unit in battery 100 capable of electrochemical reactions such as charging or discharging. Cell 20 typically includes a positive electrode, a negative electrode, and a separator. As an example, cell 20 can be a lithium-ion cell 20, which operates by the intercalation and deintercalation of lithium ions between the positive and negative electrodes.

[0036] The battery cell 20 includes a cell body 21 and tabs 22 extending from the cell body 21 along a first direction. The cell body 21 is formed by winding or stacking a positive electrode, a negative electrode, and a separator. The tabs 22 include a positive tab and a negative tab, with the positive tab electrically connected to the positive electrode and the negative tab electrically connected to the negative electrode to conduct current from the cell body 21.

[0037] It is understood that the cell body 21 can be implemented in various ways. For example, the cell body can be formed by winding a positive electrode sheet, a separator, and a negative electrode sheet into a cylindrical cell body. Or, for example, the cell body can be formed by winding or stacking a positive electrode sheet, a separator, and a negative electrode sheet into a cell body with a roughly rectangular shape.

[0038] It is understandable that the tab 22 can be set separately from the corresponding electrode, or it can be formed as an integral part of the corresponding electrode.

[0039] For example, the material of the tab 22 can be one or more of copper, aluminum, copper and nickel. This utility model does not impose any particular restrictions on this, as long as the material has good conductivity.

[0040] Combination Figure 5 The battery 100 also includes terminals 40 and adapter plates 50.

[0041] The terminal 40 is used to electrically connect the battery cell 20 located inside the housing 10 to an external device located outside the housing 10, such as an adjacent battery or other electrical equipment. In this way, the battery 100 can discharge to the external device through the tab 22 and the terminal 40, and an external power source can also charge the battery 100 through the terminal 40 and the tab 22.

[0042] The adapter 50 includes a positive adapter and a negative adapter. The positive adapter electrically connects the positive output terminal of the cell 20 to the positive output terminal of the battery 100. Specifically, one end of the positive adapter is welded to a plurality of stacked positive electrode tabs, and the other end is welded to the positive terminal of the terminal post 40. The negative adapter electrically connects the negative output terminal of the cell 20 to the negative output terminal of the battery 100. Specifically, one end of the negative adapter is welded to a plurality of stacked negative electrode tabs, and the other end is welded to the negative terminal of the terminal post 40.

[0043] In the current embodiment, the pole post 40 is disposed on the wall portion 11, and the adapter piece 50 is located between the wall portion 11 and the battery cell body 21 and electrically connects the tab 22 and the pole post 40.

[0044] For example, the material of the electrode post 40 can be one or more of copper, aluminum, aluminum alloy, and copper-aluminum alloy. This utility model does not impose any special restrictions on this, as long as the material has excellent conductivity.

[0045] For example, the adapter piece 50 can be made of one or more of aluminum, copper, and steel. This invention does not impose any particular limitation on this, as long as the material has excellent conductivity. In some embodiments, the adapter piece 50 can be made of the same material as the pole post 40 and the tab 22 to ensure welding quality.

[0046] refer to Figure 4 and Figure 5 The battery 100 also includes an insulating member 60 (hereinafter referred to as the second insulating member 60 to distinguish it from another insulating member), which is located in a first direction between the adapter piece 50 and the wall portion 11 to insulate the adapter piece 50 from the wall portion 11.

[0047] For example, the insulating element 60 can be plastic, and the plastic material can be one or more of polyethylene glycol terephthalate (PET), polypropylene (PP), polycarbonate (PC), and polyvinyl chloride (PVC). As another example, the insulating element can be rubber, and the rubber can be one or more of fluororubber, nitrile rubber, or isobutyl rubber. Of course, in other embodiments, the insulating element can also be other insulating materials, and this utility model does not place particular limitations on this.

[0048] It should be further noted that, in the accompanying drawings of the present utility model, arrow Z+ and arrow Z- may be used to indicate two opposite sides of a first direction, arrow Y+ and arrow Y- may be used to indicate two opposite sides of a second direction mentioned below, and the first direction is perpendicular to the second direction.

[0049] With reference to Figure 4 and Figure 5 , the battery 100 further includes a pressure relief valve 12. The pressure relief valve 12 is disposed on the wall portion 11, and is configured to release the internal pressure of the housing 10. When the pressure inside the housing 10 increases, the pressure relief valve 12 is broken or opened to release the pressure inside the housing 10, so as to prevent the housing 10 from bursting due to excessively high pressure.

[0050] It can be understood that there are many implementations of the pressure relief valve 12, and the present utility model does not impose special limitations in this regard. As an example, the pressure relief valve 12 may be a scored weak region formed on the wall portion 11 through a laser processing or stamping process, and the scored weak region has a smaller material thickness than the wall portion 11. When the internal pressure of the battery 100 exceeds a preset safety threshold, the scored weak region ruptures preferentially, thereby releasing the internal pressure of the housing 10.

[0051] With reference to Figure 4 and Figure 6 , the battery 100 further includes a support assembly 30. The support assembly 30 includes a first support member 31 and a first insulating member 32. The first support member 31 is located between the wall portion 11 and the cell 20 in the first direction, and the first insulating member 32 is located between the first support member 31 and the cell 20 in the first direction. The dimension of the first insulating member 32 in the first direction is h1, in mm, the dimension of the first support member 31 in the first direction is h2, in mm, the melting temperature of the first insulating member 32 is k1, in °C, the melting temperature of the first support member 31 is k2, in °C, k1<k2, and 380≤(k2-k1)×h2 / h1≤15500. Alternatively, (k2-k1)×h2 / h1 may be 380, 500, 1200, 2200, 3500, 5000, 7000, 9500, 12500 or 15500. Preferably, (k2-k1)×h2 / h1 may satisfy: 500≤(k2-k1)×h2 / h1≤12500.

[0052] If (k2-k1)×h2 / h1 is too large, i.e., greater than 15500, the heat generated during the charging and discharging of the battery 100 can easily melt the first insulating component 32, causing the first supporting component 31 to come into contact with the first insulating component 32 and form a short circuit. If (k2-k1)×h2 / h1 is too small, i.e., less than 380, the heat generated during the charging and discharging of the battery 100 can easily melt the first supporting component 31, causing the limiting effect on the cell 20 to fail. When the battery 100 is subjected to vibration, the cell 20 is prone to shaking, which can block the explosion-proof valve 12 and affect the pressure relief of the explosion-proof valve 12. According to the battery 100 provided by this utility model, limiting (k2-k1)×h2 / h1 within the above-mentioned value range can both ensure the insulation effect between the first supporting component 31 and the cell 20 and limit the position of the cell 20 to prevent it from blocking the explosion-proof valve 12.

[0053] As one possible implementation, refer to Figure 6 The first support member 31 is fixed to the adapter piece 50. Since it is necessary to electrically connect the tab 22 and the post 40, the adapter piece 50 is typically made of a metal conductor. For example, the metal conductor can be copper, iron, aluminum, steel, aluminum alloy, etc. These metal conductors have good mechanical strength, so after the first support member 31 is fixed to the adapter piece 50, the adapter piece 50 can restrain the displacement of the first support member 31 in the first direction, thereby maintaining the stability of the first support member 31 under vibration conditions.

[0054] As one possible implementation, the first support member 31 and the adapter piece 50 are integrally formed. This integral forming process reduces the assembly steps between the first support member 31 and the adapter piece 50, thus improving assembly efficiency and reducing assembly costs.

[0055] As one possible implementation, refer to Figure 5 and Figure 6 The support assembly 30 is located between the adapter piece 50 and the battery cell 20 in the first direction. In this way, when the battery cell 20 is vibrated and displaces towards the adapter piece 50, it first contacts the first support member 31, converting the impact energy into the axial pressure of the first support member 31. At this time, the adapter piece 50 can prevent the first support member 31 from displacing towards the adapter piece 50 through the reaction force.

[0056] refer to Figure 7 The second insulating member 60 is provided with a first vent 61 that allows gas to reach the explosion-proof valve. The orthographic projection of the first vent 61 on the wall 11 at least partially overlaps with the explosion-proof valve 12. Because the orthographic projection of the first vent 61 on the wall 11 at least partially overlaps with the explosion-proof valve 12, the gas generated by the battery cell 20 can be discharged to the outside of the housing 10 through the first vent 61 and the explosion-proof valve 12, thus preventing excessive pressure inside the housing 10.

[0057] refer to Figure 4 and Figure 7 The first support member 31 is provided with a through hole 311, which extends through the first support member 31 in the second direction. The gas generated by the battery cell 20 can be discharged to the explosion-proof valve 12 through the through hole 311, and then discharged outside the housing 10 through the explosion-proof valve 12, so as to prevent the housing 10 from bursting due to excessive pressure, thereby ensuring the safety performance of the battery 100.

[0058] It is understood that there are many ways to implement the through hole 311 in the first support member 31. In the current embodiment, the first support member 31 has a through hole 311. In other embodiments, the first support member 31 can also be implemented as a porous structure, and multiple holes on the first support member 31 penetrate the first support member 31 along the second direction.

[0059] refer to Figure 4 and Figure 5 The battery 100 includes multiple support components 30, including a first support component 33 and a second support component 34. The first support component 33 and the second support component 34 are respectively located on opposite sides of the explosion-proof valve 12 in a second direction. The space between the battery cell 20 and the wall portion 11 is larger in the second direction than in the first direction. Therefore, relative to the first support component 33 and the second support component 34 being located on opposite sides of the explosion-proof valve 12 in the first direction, a larger arrangement space can be obtained by placing the first support component 33 and the second support component 34 on opposite sides of the explosion-proof valve 12 in the second direction.

[0060] Continue to refer to Figure 4 and Figure 5 The multiple support components 30 also include a third support component 35 and a fourth support component 36. The third support component 35 is located on the side of the first support component 33 facing away from the second support component 34 in the second direction and is spaced apart from the first support component 33. The fourth support component 36 is located on the side of the second support component 34 facing away from the first support component 33 in the second direction and is spaced apart from the second support component 34. The first support component 33, the second support component 34, the third support component 35, and the fourth support component 36 are arranged at intervals along the second direction, which can limit the cell 20 at multiple positions in the second direction.

[0061] Continue to refer to Figure 4 and Figure 5The tab 22 includes a first tab 221 and a second tab 222 extending from the cell body 21 along a first direction. The first tab 221 is located between and spaced apart from the first support assembly 33 and the third support assembly 35, and the second tab 222 is located between and spaced apart from the second support assembly 34 and the fourth support assembly 36. Each tab 22 has a support assembly 30 on both sides in the second direction. This arrangement optimizes the spatial layout of the multiple support assemblies 30, enhances the restriction on the displacement of the cell 20, improves the uniformity of the overall load distribution, and improves the reliability and safety of the battery 100.

[0062] Continue to refer to Figure 4 The battery 100 also includes a second support member 70, which is disposed between the second insulator 60 and the battery cell 20. The orthogonal projection of the second support member 70 on the wall 11 at least partially overlaps with the explosion-proof valve 12. The second support member 70 can restrict the displacement of the battery cell 20 towards the explosion-proof valve 12, preventing the battery cell 20 from blocking the explosion-proof valve 12 and affecting the pressure relief of the explosion-proof valve 12.

[0063] refer to Figure 5 The second support member 70 is provided with a second vent 71, which is connected to the first vent 61. In this way, the gas generated by the battery cell 20 can be discharged to the outside of the housing 10 through the second vent 71, the first vent 61 and the explosion-proof valve 12, so as to avoid excessive pressure inside the housing 10.

[0064] It is understood that there are multiple ways to connect the second exhaust port 71 with the first exhaust port 61, and this utility model does not impose any particular limitation on this. For example, the second exhaust port 71 can penetrate the second support member 70 along the first direction. As another example, the second exhaust port 71 can be implemented such that a part of the second exhaust port 71 penetrates the second support member 70 along the first direction, and another part penetrates the second support member 70 along the second direction.

[0065] As one possible implementation, 180≤k2-k1≤1000. Optionally, k2-k1 can be 180, 250, 300, 400, 500, 600, 700, 800, 900 or 1000. Preferably, k2-k1 can satisfy: 300≤k2-k1≤900.

[0066] If k2-k1 is too small, i.e., less than 180, the melting temperature of the first support member 31 is low. The heat generated during the charging and discharging of the battery 100 can easily cause the first support member 31 to melt, resulting in the failure of the limiting function on the cell 20. When the battery 100 is subjected to vibration, the cell 20 is prone to shaking, which can block the explosion-proof valve 12 and affect the pressure relief of the explosion-proof valve 12. If k2-k1 is too large, i.e., greater than 1000, the melting temperature of the first insulating member 32 is low. The heat generated during the charging and discharging of the battery 100 can easily cause the first insulating member 32 to melt, which can cause the first support member 31 to come into contact with the first insulating member 32 and form a short circuit. According to the battery 100 provided by this utility model, limiting k2-k1 within the above-mentioned value range can both ensure the insulation effect between the first support member 31 and the cell 20 and limit the position of the cell 20 to prevent it from blocking the explosion-proof valve 12.

[0067] As one possible implementation, 2 ≤ h2 / h1 ≤ 16. Optionally, h2 / h1 can be 2, 4, 6, 8, 10, 12, 14 or 16. Preferably, h2 / h1 can satisfy: 6 ≤ k2 - k1 ≤ 12.

[0068] If h2 / h1 is too small, i.e., less than 2, the first support member 31 is small in the first direction. When the battery 100 is charging and discharging, the heat generated causes the first insulating member 32 to melt, and the first support member 31 fails to limit the cell 20. When the battery 100 is vibrated, the cell 20 is prone to shaking, thus blocking the explosion-proof valve 12 and affecting the pressure relief of the explosion-proof valve 12. If h2 / h1 is too large, i.e., greater than 16, the first insulating member 32 is small in the first direction. When the battery 100 is vibrated, the first insulating member 32 is easily damaged, thus causing the insulation between the first support member 31 and the first insulating member 32 to fail. According to the battery 100 provided by this utility model, limiting h2 / h1 to the above-mentioned value range can both ensure the insulation effect between the first support member 31 and the cell 20 and limit the position of the cell 20 to prevent it from blocking the explosion-proof valve 12.

[0069] As one possible implementation, 100≤k1≤350. Optionally, k1 can be 100, 160, 200, 260, 320 or 350. Preferably, k1 can satisfy: 150≤k1≤300.

[0070] For example, the material of the first insulating element 32 can be polypropylene (PP) or polyimide (PI). This invention does not impose any particular restrictions on this, as long as its melting temperature meets the above conditions.

[0071] As one possible implementation, 500≤k2≤1200. Optionally, k2 can be 500, 660, 700, 750, 800, 900, 1000, 1085 or 1200. Preferably, k2 can satisfy: 600≤k2≤1000.

[0072] For example, the material of the first support member 31 can be copper or aluminum. This utility model does not impose any special restrictions on this, as long as its melting temperature meets the above conditions.

[0073] As one possible implementation, 0.1 ≤ h1 ≤ 2. Optionally, h1 can be 0.1, 0.3, 0.5, 0.7, 1, 1.2, 1.4, 1.6, 1.8 or 2. Preferably, h1 can satisfy: 0.3 ≤ h2 ≤ 1.4.

[0074] As one possible implementation, 1 ≤ h2 ≤ 7. Optionally, h2 can be 1, 2, 3, 4, 5, 6 or 7. Preferably, h2 can satisfy: 2 ≤ h2 ≤ 5.

[0075] It should be understood that there are various ways to implement the battery in this disclosure, and it should not be construed as being limited to the embodiments described above. The following, in conjunction with... Figure 8 and Figure 9 The following are illustrative examples of variations of this disclosure. It should be noted that the foregoing embodiments and the following variations share some common elements. In the following variations, these elements will use the same reference numerals as in the foregoing embodiments to omit repeated descriptions.

[0076] refer to Figure 8 In the first modified example, the first support member 31a of the battery 100a is fixed to the adapter piece 50a, and the side of the first support member 31a facing the adapter piece 50a is a flat surface. Designing the side of the first support member 31a facing the adapter piece 50a as a flat surface facilitates the assembly of the first support member 31a and the adapter piece 50a.

[0077] It is understood that there are many ways to fix the first support member 31a to the adapter piece 50a, and this utility model does not impose any particular limitation on this. For example, the first support member 31a can be fixed to the adapter piece 50a by adhesive bonding or by welding.

[0078] Continue to refer to Figure 8The first support member 31a and the first insulating member 32a have curved contact interfaces. This results in a larger contact area between the first support member 31a and the first insulating member 32a, thereby improving assembly reliability. Furthermore, the side of the first insulating member 32a facing the battery cell 20 is a curved surface. Because the contact area between the battery cell 20 and the first insulating member 32a is large, when the battery cell 20 moves towards the first insulating member 32a, the curved surface between them can disperse stress, reducing local pressure concentration at the contact interface, thereby ensuring the structural stability of the first insulating member 32a.

[0079] refer to Figure 9 In the second variation, the first support member 31b of the battery 100b is fixed to the second insulating member 60b. Since the second insulating member 60b can insulate the first support member 31b from other components, no additional insulating member is required.

[0080] As one possible implementation, the first support member 31b is made of metal and is partially molded into the second insulating member 60b. The first support member 31b provides high-strength support, restricts the position of the battery cell 20, and prevents it from blocking the explosion-proof valve 12.

[0081] It should be understood that the term "comprising" and its variations used in this utility model are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0082] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements (such as the first insulating element and the second insulating element), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0083] The scope of protection of this utility model is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A battery (100), characterized in that, comprising: a housing (10), comprising a wall portion (11) located on one side in a first direction, wherein the wall portion (11) is provided with a explosion-proof valve (12); a cell (20), arranged in the housing (10); and a support assembly (30), comprising a first support member (31) and a first insulating member (32), wherein the first support member (31) is located between the wall portion (11) and the cell (20) in the first direction, and the first insulating member (32) is located between the first support member (31) and the cell (20) in the first direction, wherein the dimension of the first insulating member (32) in the first direction is h1 in mm, the dimension of the first support member (31) in the first direction is h2 in mm, the melting temperature of the first insulating member (32) is k1 in °C, the melting temperature of the first support member (31) is k2 in °C, k1<k2, and 380≤(k2-k1)×h2 / h1≤15500.

2. The battery (100) according to claim 1, characterized in that, further comprising a pole post (40) and an adapter piece (50), wherein the cell (20) comprises a cell body (21) and a tab (22) extending from the cell body (21) along the first direction, the pole post (40) is arranged on the wall portion (11), the adapter piece (50) is located between the wall portion (11) and the cell body (21) and electrically connects the tab (22) and the pole post (40), and the first support member (31) is fixed to the adapter piece (50).

3. The battery (100) according to claim 2, characterized in that, The first support member (31) and the adapter piece (50) are integrally formed.

4. The battery (100) according to claim 2, characterized in that, The support assembly (30) is located between the adapter piece (50) and the cell (20) in the first direction.

5. The battery (100) according to claim 4, characterized in that, The side surface of the first support member (31) facing the adapter piece (50) is a flat surface.

6. The battery (100) according to claim 1, characterized in that, further comprising a pole post (40), an adapter piece (50) and a second insulating member (60), wherein the cell (20) comprises a cell body (21) and a tab (22) extending from the cell body (21) along the first direction, the pole post (40) is arranged on the wall portion (11), the adapter piece (50) is located between the wall portion (11) and the cell body (21) and electrically connects the tab (22) and the pole post (40), the second insulating member (60) is located between the adapter piece (50) and the wall portion (11) in the first direction, the second insulating member (60) is provided with a first vent hole (61) that allows gas to pass therethrough to reach the explosion-proof valve (12), the orthographic projection plane of the first vent hole (61) on the wall portion (11) at least partially overlaps with the explosion-proof valve (12), and the first support member (31) is fixed to the second insulating member (60).

7. The battery (100) according to claim 6, characterized in that, The first support member (31) is made of metal, and the first support member (31) is partially embedded in the second insulating member (60) in a molding manner.

8. The battery (100) according to claim 1, characterized in that, The first support member (31) and the first insulating member (32) have a curved contact interface.

9. The battery (100) according to claim 1, characterized in that, The side of the first insulating member (32) facing the battery cell (20) is a curved surface.

10. The battery (100) according to claim 1, characterized in that, The first support member (31) is provided with a through hole (311), which penetrates the first support member (31) along a second direction perpendicular to the first direction.

11. The battery (100) according to claim 1, characterized in that, The device includes a plurality of support components (30), the plurality of support components (30) including a first support component (33) and a second support component (34), the first support component (33) and the second support component (34) being located on opposite sides of the explosion-proof valve (12) in a second direction, the second direction being perpendicular to the first direction.

12. The battery (100) according to claim 11, characterized in that, The plurality of support components (30) further include a third support component (35) and a fourth support component (36), wherein the third support component (35) is located on the side of the first support component (33) facing away from the second support component (34) in the second direction and is spaced apart from the first support component (33), and the fourth support component (36) is located on the side of the second support component (34) facing away from the first support component (33) in the second direction and is spaced apart from the second support component (34).

13. The battery (100) according to claim 12, characterized in that, The battery cell (20) includes a battery cell body (21) and a first tab (221) and a second tab (222) extending from the battery cell body (21) along the first direction. The first tab (221) is located between and spaced apart from the first support assembly (33) and the third support assembly (35), and the second tab (222) is located between and spaced apart from the second support assembly (34) and the fourth support assembly (36).

14. The battery (100) according to claim 1, characterized in that, It also includes a pole post (40), an adapter plate (50), a second insulating member (60), and a second support member (70). The battery cell (20) includes a battery cell body (21) and a tab (22) extending from the battery cell body (21) along the first direction. The pole post (40) is disposed on the wall portion (11). The adapter plate (50) is located between the wall portion (11) and the battery cell body (21) and electrically connects the tab (22) and the pole post (40). The second insulating member (60) is located between the adapter plate (50) and the wall portion (11) in the first direction. The second insulating member (60) is provided with a first vent (61) that allows gas to reach the explosion-proof valve (12) through it. The second support member (70) is disposed between the second insulating member (60) and the battery cell (20). The orthographic projection of the second support member (70) on the wall portion (11) at least partially overlaps with the explosion-proof valve (12).

15. The battery (100) according to claim 14, characterized in that, The second support member (70) is provided with a second vent (71), which is connected to the first vent (61).

16. The battery (100) according to claim 1, characterized in that, 180≤k2-k1≤1000; and / or 2≤h2 / h1≤16.

17. The battery (100) according to claim 1, characterized in that, 100≤k1≤350; and / or, 500≤k2≤1200; and / or, 0.1≤h1≤2; and / or, 1≤h2≤7.

18. A battery pack (200), characterized in that, The battery (100) includes any one of claims 1 to 17.

19. An electrical appliance (300), characterized in that, Includes the battery pack (200) as described in claim 18.

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