Battery and electric device

Abstract

Provided are a battery and an electric device. The battery comprises: a case, the case having an accommodating cavity; a top cover, the top cover being connected to the case and covering and sealing the accommodating cavity; an electrode assembly, the electrode assembly being arranged in the accommodating cavity, the electrode assembly having a height direction x, and the electrode assembly comprising a first surface and a second surface; and a supporting member having elasticity, the supporting member being arranged between the electrode assembly and the case in a compressed mode, wherein the orthographic projection of the supporting member in the height direction x on the inner wall of the case has an area S mm2, the supporting member has a maximum size D mm in an uncompressed state, and the mass of the electrode assembly is M kg and satisfies that: 0 kg / mm3 < M / (S×D) ≤ 1 kg / mm3. The electrode assembly is supported using expansion characteristics of the supporting member, and the mass of the electrode assembly is set in association with the size of the supporting member, so that when the electrode assembly is placed on its side, contact between the electrode assembly and the inner wall of the case is avoided, and stress concentration in the cycle process is avoided, prolonging the service life of the battery when the electrode assembly is placed on its side.

Description

Battery and power device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 16, 2023, with application number 202311037269.2 and application name “A Battery and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to, but are not limited to, the field of battery technology, and specifically to a battery and an electrical device. Background Art

[0003] When a lithium-ion battery is placed on its side, the electrode assembly is tilted in the shell due to the gravity of the electrode assembly inside the shell. The bottom corner of the electrode assembly will contact the inner wall of the shell. As the cycle progresses, the shell will clamp the expanded electrode assembly, causing the expansion force at the bottom corner to continue to increase. Lithium is preferentially deposited at the corner, which leads to premature failure of the electrode assembly and shortened battery life. Technical issues

[0004] The present application provides a battery and an electrical device to solve the problem of excessive expansion of the bottom corner of the electrode assembly during side-mounted use, which leads to lithium deposition and failure of the electrode assembly. Technical Solutions

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] In a first aspect, the present application provides a battery, comprising:

[0007] a housing, wherein the housing has a receiving cavity;

[0008] a top cover connected to the shell and covering the accommodating cavity;

[0009] an electrode assembly, the electrode assembly being disposed in the accommodating cavity, the electrode assembly having a height direction x, and the electrode assembly comprising a first surface and a second surface disposed opposite to each other in the height direction x;

[0010] The support member is elastic and is compressed between the first surface and the shell along the height direction; and / or, the support member is compressed between the second surface and the shell along the height direction; the battery meets: 0kg / mm 3 <M / (S×D)≤1kg / mm 3 ;

[0011] The orthographic projection area of ​​the support member on the inner wall of the housing along the height direction is S mm.2 , the maximum dimension of the support member in the uncompressed state along the height direction is D mm, and the mass of the electrode assembly is M kg.

[0012] Optionally, the battery further meets: 0.3kg / mm 3 <M / (S×D)≤0.7kg / mm 3 .

[0013] Optionally, a surface of the electrode assembly facing the top cover is a third surface, and the third surface connects the first surface and the second surface;

[0014] The top cover is provided with a first pole and a second pole spaced apart along the height direction x, and the third surface is provided with a first tab and a second tab spaced apart along the height direction x, the first tab being connected to the first pole, and the second tab being connected to the second pole;

[0015] One side of the support member is connected to the first surface, and a side of the support member away from the electrode assembly is connected to the inner wall of the shell; and / or,

[0016] One side of the support member is connected to the second surface, and a side of the support member away from the electrode assembly is connected to the inner wall of the shell.

[0017] Optionally, two groups of support members are provided, one group of support members is provided between the first surface and the shell, and the other group of support members is provided between the second surface and the shell, and the two groups of support members 40 are symmetrically provided along the central axis of the electrode assembly 30 in the height direction x.

[0018] Optionally, the battery further meets: 5mm 3 ≤S×D≤42000mm 3 .

[0019] Optionally, the battery further meets: 1000mm 3 ≤S×D≤25000mm 3 .

[0020] Optionally, there is a maximum gap L mm between the electrode assembly and the inner wall of the shell in the height direction x, satisfying: D>L.

[0021] Optionally, the resistivity of the support member is from 10 12 Ω·cm to 10 18 Ω·cm.

[0022] Optionally, the support member is selected from at least one of expansion tape, expansion rubber, soft plastic, and foam.

[0023] Optionally, the orthographic projection of the first surface or the second surface on the inner wall of the housing along the height direction x has an area of ​​50 mm. 2 , satisfying: 0.01≤S / S0≤1.

[0024] Optionally, the battery further satisfies at least one of the following characteristics:

[0025] d)50≤S≤14000;

[0026] e) 0.1≤D≤3;

[0027] f)0<M≤5.

[0028] In a second aspect, the present application also provides an electrical device comprising the battery. Beneficial effects

[0029] Compared to the prior art, the present application provides a battery comprising: a housing having a receiving cavity; a top cover connected to the housing and covering the receiving cavity; an electrode assembly disposed in the receiving cavity, the electrode assembly having a height direction x, the electrode assembly comprising a first surface and a second surface disposed opposite to each other in the height direction x; a support member having elasticity, the support member being compressed and disposed between the first surface and the housing and / or between the second surface and the housing; wherein the orthographic projection of the support member on the inner wall of the housing along the height direction x has an area S mm 2 , the support has a maximum dimension D mm in the uncompressed state, the mass of the electrode assembly is M kg, and it satisfies: 0 kg / mm 3 <M / (S×D)≤1kg / mm 3 When the present application meets the above range, the electrode assembly can be propped up by the expansion characteristics of the support member to prevent the electrode assembly from contacting the inner wall of the shell when placed on its side, thereby avoiding stress concentration during the cycle and extending the service life of the battery when the electrode assembly is placed on its side.

[0030] It should be noted that the electrical device provided in this application has all the technical features and beneficial effects of the above-mentioned battery, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a front view schematic diagram of a battery provided in an embodiment of the present application;

[0032] FIG2 is a partial enlarged schematic diagram of point A in FIG1 ;

[0033] FIG3 is a schematic top view of a battery provided in an embodiment of the present application;

[0034] FIG4 is a schematic side view of a battery provided in an embodiment of the present application;

[0035] FIG5 is a schematic diagram of a battery structure without a support member provided in an embodiment of the present application;

[0036] Reference numerals: 10 - shell, 101 - accommodating cavity, 20 - top cover, 201 - first pole, 202 - second pole, 30 - electrode assembly, 301 - first side, 302 - second side, 303 - third side, 304 - first pole tab, 305 - second pole tab, 40 - support member.

[0037] Implementation Methods of the Application

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. The described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0039] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0040] In order to maximize the energy density and service life of lithium-ion batteries, group margin is an important factor that will be given special consideration when designing lithium-ion batteries. On the one hand, if the group margin is too low, it will result in a waste of space. On the other hand, if the group margin is too high, the expansion force of the battery cell will increase rapidly during the cycle, which is detrimental to the use of the battery. In order to more effectively improve production efficiency, lithium-ion batteries are assembled by placing them on their side. During the battery's use, the electrode assembly will be tilted in the shell due to its own gravity during initial use. As shown in Figure 5, the bottom corner of the electrode assembly has already contacted the aluminum shell. As the cycle progresses, when the electrode assembly contacts the shell in the thickness direction, it will clamp the winding core, making it unable to move in the width direction. As a result, the expansion force at the bottom corner continues to increase, causing lithium to be preferentially deposited at the corner, ultimately causing the electrode assembly to fail prematurely and shortening its service life.

[0041] Therefore, it is necessary to provide a battery and an electrical device to solve the problem that the bottom corners of the electrode assembly expand excessively during side-mounted use, resulting in lithium deposition and failure of the battery cell.

[0042] 1 , this embodiment provides a battery, comprising: a shell 10, a top cover 20, an electrode assembly 30, and a support member 40, wherein the shell 10 has a receiving cavity 101; the top cover 20 is connected to the shell 10 and covers the receiving cavity 101; the electrode assembly 30 is disposed in the receiving cavity 101, the electrode assembly 30 has a height direction x, and the electrode assembly 30 includes a first surface 301 and a second surface 302 disposed opposite to each other in the height direction x; along the height direction x, the support member 40 is compressed and disposed between the first surface 301 and the shell 10; and / or, along the height direction x, the support member 40 is compressed and disposed between the second surface 302 and the shell 10 to separate the first surface 301 and the second surface 302 from the inner wall of the shell 10 and support the electrode assembly 30; wherein the orthographic projection of the support member 40 on the inner wall of the shell 10 along the height direction x has an area S mm 2 , the support member 40 has a maximum dimension D mm in the uncompressed state, which satisfies: 5mm 3 ≤S×D≤42000mm 3 .

[0043] In some specific embodiments, in order to provide good support for the electrode assembly 30, the support member 40 is elastic, so that it has good cushioning performance. When the support member 40 is placed between the electrode assembly 30 and the housing 10, it is in a compressed state, providing elastic support for the electrode assembly 30.

[0044] It should be noted that when the 5mm 3 ≤S×D≤42000mm 3 When the electrode assembly 30 is within the range of the support member 40, the support member 40 can prop up the electrode assembly 30 to prevent the electrode assembly 30 from contacting the inner wall of the shell 10 when it is placed on its side, thereby preventing the bottom of the electrode assembly 30 from contacting the shell 10 to generate stress concentration, further preventing the problem of preferential lithium deposition at the corners of the electrode assembly 30, and extending the service life of the battery when the electrode assembly 30 is placed on its side.

[0045] Furthermore, by defining the area S mm of the orthographic projection of the support member 40 on the first surface 301 or the second surface 302 along the height direction x 2 The maximum dimension D mm of the support member 40 in the uncompressed state further reflects the spatial range occupied by the support member 40 in the height direction x. When the above range is met, the support member 40 can be guaranteed to have better structural stability and can withstand loads in the height direction x, thereby improving its load-bearing capacity.

[0046] In some embodiments, the height direction x is the direction indicated by the arrow in Figure 1. In addition, the area S mm of the orthographic projection of the support member 40 on the inner wall of the housing 10 along the height direction x is defined above. 2It can be obtained directly by calculating the area of ​​the figure corresponding to the orthographic projection. The shape of the orthographic projection can be a rectangle, circle, ellipse, parallelogram, trapezoid, etc., but is not limited to any of the above shapes. In addition, if it is an irregular shape, the area of ​​the circumscribed rectangle can be used as the area S.

[0047] The maximum dimension D of the support member 40 in its uncompressed state along the height direction x is measured by disassembling the battery, removing the electrode assembly 30 and support member 40, and then leaving the support member 40 in its natural, uncompressed state for approximately 0.5-1.0 hours. The thickness of the support member 40 is then measured using a caliper or other similar device. It should be noted that since the support member 40 may have an irregular shape after recovering from compression, the maximum dimension D refers to the maximum dimension of the support member 40 in the thickness direction. In the illustrated embodiment, the height direction x coincides with the thickness direction of the support member 40.

[0048] In some embodiments, further referring to Figures 1 and 2, the surface of the electrode assembly 30 facing the top cover 20 is the third surface 303, and the third surface 303 connects the first surface 301 and the second surface 302; the top cover 20 is provided with a first pole 201 and a second pole 202 spaced apart along the height direction x, and the third surface 303 is provided with a first pole ear 304 and a second pole ear 305 spaced apart along the height direction x, the first pole ear 304 is connected to the first pole 201, and the second pole ear 305 is connected to the second pole 202; one side of the support member 40 is connected to the first surface 301 and the second surface 302, and the side of the support member 40 away from the electrode assembly 30 is connected to the inner wall of the shell 10.

[0049] It should be noted that Figure 1 shows the state of the battery of this embodiment when it is placed on its side, wherein the presence of the support member 40 can effectively disperse and bear the weight and force of the electrode assembly 30, preventing the electrode assembly 30 from deforming or moving during use; the support member 40 can also provide additional protection and support, reducing the impact of external shock or vibration on the electrode assembly 30, which helps to extend the service life of the electrode assembly 30 and improve its stability and reliability. At the same time, the above connection method can also minimize the internal space occupied by the electrode assembly 30 and the support member 40, providing more space for other components.

[0050] Furthermore, the first electrode 201 and the second electrode 202 can be the positive electrode and the negative electrode of the battery respectively. The first electrode ear 304 connected to the first electrode 201 is the positive electrode ear, and the first electrode ear 304 connected to the second electrode 202 is the negative electrode ear. Through the connection of the positive electrode, the negative electrode and the corresponding positive and negative electrode ears, the battery can realize current transmission between the positive and negative electrodes, thereby realizing normal operation of the battery.

[0051] In some embodiments, referring to FIG3 , two groups of support members 40 are provided: one group of support members 40 is provided between the first surface 301 and the housing 10, and the other group of support members 40 is provided between the second surface 302 and the housing 10. The two groups of support members 40 are symmetrically arranged along the central axis of the electrode assembly 30 in the height direction x. It should be noted that the symmetrical arrangement of the support members 40 can also balance the supporting force, reduce uneven stress distribution within the housing, and improve the overall stability of the battery. The symmetrical structure also helps to reduce the impact of external forces and vibrations on the battery, thereby improving the battery's anti-interference ability.

[0052] In some embodiments, the mass of the electrode assembly 30 is M kg, and the battery further satisfies: 0 kg / mm 3 <M / (S×D)≤1kg / mm 3 It should be noted that in order to ensure the supporting effect of the support member 40 on the electrode assembly 30, it is necessary to further examine the impact of the mass of the electrode assembly 30. When the above range is met, it can be further ensured that the support member 40 has sufficient strength and stability to withstand the mass of the electrode assembly 30. The support member 40 can also be reasonably structurally designed to ensure that the support member 40 can evenly distribute and transfer the mass of the electrode assembly 30; it can avoid contact between the electrode assembly 30 and the shell 10, further improving the service life of the battery.

[0053] In some embodiments, the battery further meets: 0.3 kg / mm 3 <M / (S×D)≤0.7kg / mm 3 , further meeting this range can further ensure that the support member 40 has sufficient strength and stability to withstand the mass of the electrode assembly 30, so that the cycle life of the battery is further optimized.

[0054] In some embodiments, there is a maximum gap L mm between the electrode assembly 30 and the inner wall of the housing 10 in the height direction x, satisfying: D>L. It should be noted that when D>L is satisfied, the gap between the electrode assembly 30 and the inner wall of the housing 10 can be ensured while further ensuring the support effect of the support member 40 on the electrode assembly 30. This is because under the above dimensional requirements, the support member 40 is in a compressed state within the housing 10. In order to overcome the compression state, the support member 40 exerts a certain reverse force on the electrode assembly 30 to ensure the support effect.

[0055] In some embodiments, the support member 40 further satisfies the following requirements: within a pressure range of 0.5 kPa to 200 kPa, the compression amount of the support member 40 ranges from 0.02 mm to 2 mm. This indicates that the support member 40 has a certain elasticity and compressibility. Within a given pressure range, the compression amount of the support member 40 ranges from 0.02 mm to 2 mm, which means that the support member 40 can undergo a certain degree of compression deformation under different pressures. This elasticity and compressibility can enable the support member 40 to adapt to different pressure environments and provide a certain buffering and absorption capacity. When the external pressure increases, the support member 40 can also be compressed to reduce the transmission and impact of the pressure, thereby protecting the electrode assembly 30. In addition, the compression range of the support member 40 can also be used to adjust and balance the pressure distribution within the battery to achieve battery balance and stability.

[0056] In some embodiments, the resistivity of the support member 40 ranges from 10 12 Ω·cm to 10 18 Ω·cm, for example, the resistivity of the support member 40 may be 10 12 Ω·cm, 10 13 Ω·cm, 10 13 Ω·cm, 10 14 Ω·cm, 10 15 Ω·cm, 10 16 Ω·cm, 10 17 Ω·cm and 10 18 The above range indicates that the support member 40 has high electrical insulation, which allows the support member 40 to also be used as an electrical isolation component between the electrode assembly 30 and the housing 10 to prevent unexpected current flow and interference, as well as internal short circuit problems of the battery.

[0057] In some embodiments, the support member 40 is selected from at least one of expandable tape, expandable rubber, soft plastic, and foam. It should be noted that the selection of materials such as expandable tape, expandable rubber, soft plastic, and foam as the material for the support member 40 can provide appropriate softness and expandability to meet the requirements of the support member 40 in a specific environment. This configuration allows the support member 40 to adapt to components of different shapes and sizes and provide uniform support force, thereby enhancing the stability and reliability of the battery.

[0058] In some embodiments, referring to FIG. 4 , the orthographic projection of the first surface 301 or the second surface 302 along the height direction x on the inner wall of the housing 10 has an area of ​​50 mm. 2, satisfying: 0.01≤S / S0≤1. For example, S / S0 can be any value among 0.01, 0.02, 0.05, 0.08, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1, or a range between any two values. It should be noted that by limiting the range of 0.01≤S / S0≤1, the position of the support member 40 can be reasonably arranged so that the support member 40 can be reasonably distributed on the first surface 301 and the second surface 302, which helps to balance the supporting force, reduce stress concentration, and improve the supporting effect.

[0059] In some embodiments, the battery further satisfies: 50≤S≤14000. For example, S can be any value of 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 1000, 1100, 1200, 1500, 1800, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 6000, 7000, 8000, 9000, 10000, 11000, 12000, 13000, and 14000, or a range between any two values. It should be noted that when the above range is met, the supporting effect of the support member 40 can be improved.

[0060] In some embodiments, the battery further satisfies: 0.1 ≤ D ≤ 3. For example, D can be any value of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.2, 1.5, 1.8, 2.0, 2.2, 2.5, 2.8, and 3, or a range between any two values. It should be noted that when the above range is met, the load-bearing capacity of the support member 40 can be improved.

[0061] In some embodiments, the battery further meets: 1000mm 3 ≤S×D≤25000mm 3 .

[0062] In some embodiments, the value of S×D may be 5 mm. 3 , 6mm 3 , 7mm 3 , 8mm 3 , 9mm 3 , 10mm 3 , 15mm 3 , 20mm 3 , 50mm 3 , 100mm 3 , 200mm 3, 500mm 3 , 1000mm 3 , 2000mm 3 , 5000mm 3 , 8000mm 3 , 10000mm 3 、15000mm 3 , 20000mm 3 , 25000mm 3 、30000mm 3 、35000mm 3 40000mm 3 、41000mm 3 and 42000mm 3 Any value or a range between any two values ​​in .

[0063] In some embodiments, the battery further satisfies: 0<M≤5.

[0064] In some embodiments, this embodiment further provides an electrical device, which includes the battery of this embodiment. The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes airplanes, rockets, space shuttles, and spacecraft, and the like; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of this application do not impose any special restrictions on the above-mentioned electrical devices.

[0065] Example 1

[0066] This embodiment provides a battery, the structure of which is shown in FIG1 , wherein a support member 40 is provided on the first surface 301 and the second surface 302 of the electrode assembly 30 , and the support member 40 is a polyethylene terephthalate (PET) expansion tape.

[0067] The structure of Example 2-25 is the same as that of Example 1

[0068] Example 26

[0069] This embodiment provides a battery, the structure of which is shown in FIG1 , wherein a support member 40 is provided on the first surface 301 and the second surface 302 of the electrode assembly 30 , and the support member 40 is polystyrene foam (EPS).

[0070] Example 27

[0071] This embodiment provides a battery, the structure of which is shown in FIG1 , wherein a support member 40 is provided on the first surface 301 and the second surface 302 of the electrode assembly 30 , and the support member 40 is made of polystyrene (PS).

[0072] Example 28

[0073] This embodiment provides a battery, the structure of which is shown in FIG1 , wherein a support member 40 is provided on the first surface 301 and the second surface 302 of the electrode assembly 30 , and the support member 40 is made of soft rubber.

[0074] The structure of Comparative Example 1-2 is the same as that of Example 1.

[0075] Performance tests were performed on the batteries of Examples 1-28 and Comparative Examples 1-2. The test conditions were: at 60°C, 2C / 2C accelerated cycling for 1000 cls, the capacity retention rate of the electrode assembly was tested; the calculation formula was: capacity retention rate = (capacity at the end of each cycle / initial capacity) × 100%. The results are shown in Table 1.

[0076] Table 1

[0077] As can be seen from Table 1, in Examples 1-28, the electrode assembly 30 can be propped up to a certain extent by providing a support member 40, thereby avoiding contact between the electrode assembly 30 and the interior of the shell 10, and the batteries all exhibit excellent performance; in Comparative Example 1, since the thickness D and area S of the support member 40 are relatively small, the support force for the heavier electrode assembly 30 is relatively weak, and the risk of lithium deposition caused by contact between the electrode assembly and the interior of the shell 10 cannot be well resolved. Therefore, the battery capacity retention rate of Comparative Example 1 is relatively low; and in Comparative Example 2, the thickness D and area S of the support member 40 are further reduced, but the support force for the lighter electrode assembly is still insufficient, and the battery capacity retention rate of Comparative Example 2 is still relatively low. In summary, compared with Comparative Examples 1-2, the battery of Example 1-28 meets 0kg / mm 3 <M / (S×D)≤1kg / mm 3 The capacity retention rate of the battery is higher than that of comparative examples 1-2, which shows that the electrode assembly 30 can be propped up by the expansion characteristics of the support member 40, so as to avoid the electrode assembly 30 from contacting the inner wall of the shell 10 when it is placed on its side, thereby avoiding stress concentration during the cycle and lithium plating of the electrode assembly, and extending the service life of the battery when the electrode assembly 30 is placed on its side.

[0078] The above is a detailed introduction to a battery and an electrical device provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A battery, wherein: include: A housing (10), wherein the housing (10) has a receiving chamber (101); A top cover (20), the top cover (20) being connected to the housing (10) and covering the accommodating cavity (101); An electrode assembly (30), the electrode assembly (30) being arranged in the accommodating cavity (101), the electrode assembly (30) having a height direction (x), and the electrode assembly (30) comprising a first surface (301) and a second surface (302) arranged in opposite directions in the height direction (x); a support member (40), the support member (40) being elastic, and being compressed and arranged between the first surface (301) and the shell (10) along the height direction (x); and / or being compressed and arranged between the second surface (302) and the shell (10) along the height direction (x); The battery meets the following requirements: 0kg / mm 3 <M / (S×D)≤1kg / mm 3 ; The orthographic projection area of ​​the support member (40) on the inner wall of the housing (10) along the height direction (x) is S mm 2 The maximum dimension of the support member (40) in the uncompressed state along the height direction (x) is D mm, and the mass of the electrode assembly (30) is M kg.

2. The battery according to claim 1, wherein The battery meets the following requirements: 0.3kg / mm 3 <M / (S×D)≤0.7kg / mm 3 .

3. The battery according to claim 1, wherein The surface of the electrode assembly (30) facing the top cover (20) is a third surface (303), and the third surface (303) connects the first surface (301) and the second surface (302); The top cover (20) is provided with a first pole (201) and a second pole (202) arranged at intervals along the height direction (x); the third surface (303) is provided with a first pole lug (304) and a second pole lug (305) arranged at intervals along the height direction (x); the first pole lug (304) is connected to the first pole (201), and the second pole lug (305) is connected to the second pole (202); One side of the support member (40) is connected to the first surface (301), and the side of the support member (40) away from the electrode assembly (30) is connected to the inner wall of the shell (10).

4. The battery according to claim 1, wherein The surface of the electrode assembly (30) facing the top cover (20) is a third surface (303), and the third surface (303) connects the first surface (301) and the second surface (302); The top cover (20) is provided with a first pole (201) and a second pole (202) arranged at intervals along the height direction (x), and the third surface (303) is provided with a first pole lug (304) and a second pole lug (302) arranged at intervals along the height direction (x). A second pole lug (305), wherein the first pole lug (304) is connected to the first pole column (201), and the second pole lug (305) is connected to the second pole column (202); One side of the support member (40) is connected to the second surface (302), and the side of the support member (40) away from the electrode assembly (30) is connected to the inner wall of the shell (10).

5. The battery according to claim 1, wherein The support members (40) are provided in two groups, one group of the support members (40) is provided between the first surface (301) and the shell (10), and the other group of the support members (40) is provided between the second surface (302) and the shell (10), and the two groups of the support members (40) are symmetrically arranged along the central axis of the electrode assembly (30) in the height direction (x).

6. The battery according to claim 1, wherein The battery meets the following requirements: 5mm 3 ≤S×D≤42000mm 3 .

7. The battery according to claim 1, wherein The battery meets: 1000mm 3 ≤S×D≤25000mm 3 .

8. The battery according to claim 1, wherein There is a maximum gap of L mm between the electrode assembly (30) and the inner wall of the housing (10) in the height direction (x), satisfying: D>L.

9. The battery according to claim 1, wherein The resistivity of the support member (40) is from 10 12 Ω·cm to 10 18 Ω·cm.

10. The battery according to claim 1, wherein The support member (40) is selected from at least one of expansion tape, expansion rubber, soft plastic, and foam.

11. The battery according to claim 1, wherein The orthographic projection of the first surface (301) along the height direction (x) on the inner wall of the housing (10) has an area of ​​S0 mm. 2 , satisfying: 0.01≤S / S0≤1.

12. The battery according to claim 1, wherein The orthographic projection of the second surface (302) along the height direction (x) on the inner wall of the housing (10) has an area of ​​S0 mm. 2 , satisfying: 0.01≤S / S0≤1.

13. The battery according to claim 1, wherein The battery meets at least one of the following characteristics: d)50≤S≤14000; e) 0.1≤D≤3; f)0<M≤5.

14. The battery according to claim 1, wherein Under the pressure range of 0.5 kPa to 200 kPa, the compression amount of the support member 40 is from 0.02 mm to 2 mm.

15. An electrical device, wherein: A battery comprising the battery according to any one of claims 1 to 14.

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