A battery

Abstract

The present invention provides a battery, comprising a shell, a pole element, an insulating member, and a battery cell located in the shell, wherein the pole element is fixed relative to the shell, the pole element and the shell are insulated by the insulating member, the pole element comprises a conductive sheet and N poles located on the same side of the conductive sheet, N≥2, the N poles have the same polarity and are an integral structure with the conductive sheet, the battery cell comprises a pole ear, the conductive sheet is welded to the pole ear and the weld print area is S1, the shell is provided with a through hole, each pole corresponds to one through hole, at least part of the pole passes through the corresponding through hole, the cross-sectional area of ​​the through hole is S2, 0.04≤(N*S2) / S1≤1.2. The insulating member of the battery will not melt due to welding heat, and the battery as a whole has good current carrying capacity and good electrical connection stability.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery. Background Art

[0002] In a typical battery, multiple poles of the same polarity are welded to the adapter, and the adapter is welded to the pole ear. This battery has the problems of large battery resistance and poor current carrying capacity. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a battery, comprising a shell, a pole element, an insulating member and a battery cell located in the shell, the pole element is fixed relative to the shell, the pole element and the shell are insulated by the insulating member, the pole element comprises a conductive sheet and N poles located on the same side of the conductive sheet, N≥2, the N poles have the same polarity and are an integral structure with the conductive sheet, the battery cell comprises a pole ear, the conductive sheet is welded to the pole ear and the weld print area is S1, the shell is provided with a through hole, each pole corresponds to one through hole, at least part of the pole passes through the corresponding through hole, the cross-sectional area of ​​the through hole is S2, 0.04≤(N*S2) / S1≤1.2.

[0004] The above-mentioned battery provided in the present application has an integrated structure of the pole and the conductive sheet, so the pole and the conductive sheet do not need to be welded. If the pole and the conductive sheet are welded, the welding area of ​​the pole and the conductive sheet will be relatively small due to the size of the pole, resulting in a relatively large welding resistance of the pole and the conductive sheet, and a relatively poor current carrying capacity, which becomes a bottleneck point limiting the overall current carrying capacity of the battery, making the overall current carrying capacity of the battery relatively poor. The present application makes the pole and the conductive sheet an integrated structure, thereby avoiding the limitation of the welding of the pole and the conductive sheet on the overall current carrying capacity of the battery.

[0005] In addition, since the conductive sheet is welded to the pole ear, the pole and the shell are insulated by an insulating member. Therefore, when the conductive sheet and the pole ear are welded, the welding heat will be transferred to the insulating member through the pole. The sum of the cross-sectional areas of the through holes on the shell through which the poles are inserted is N*S2, and the weld print area of ​​the conductive sheet and the pole ear is S1. By controlling the ratio of N*S2 to S1 within the range of 0.04~1.2, it is possible to avoid the through hole for penetrating the pole being too small, resulting in the heat of welding the pole ear and the conductive sheet being unable to be quickly released, causing the insulating member to melt, affecting the insulation performance between the pole and the shell, and ensuring that the battery has better current capacity and better electrical connection stability. At the same time, it is possible to prevent the through hole for penetrating the pole from being too large, avoid interference when adjacent poles are fixed, and avoid deformation of the shell between the two poles. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A three-dimensional diagram of a partial structure of an embodiment of a battery provided in the present application;

[0007] Figure 2 for Figure 1 A cross-sectional view of

[0008] Figure 3 for Figure 1 A three-dimensional view of the middle pole element;

[0009] Figure 4 for Figure 3 Another perspective of the picture;

[0010] Figure 5 This is an exploded view of the pole components, output components, and insulating components.

[0011] The following are the descriptions of the reference numerals:

[0012] 1 pole element, 11 conductive sheet, 11a thick area, 11b thin area, 11c fuse structure, 12 pole, 121 pole body, 122 riveted flange, 121a large diameter section, 121b small diameter section, B first riveted step surface, C second riveted step surface; 2 output member; 3 shell, A through hole; 4 insulating member, 41 first insulating part, 42 second insulating part. DETAILED DESCRIPTION

[0013] The present application provides a battery. In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] like Figure 1 As shown, the battery includes a housing 3 (only the cover portion of the housing 3 is shown in the figure), a battery cell (not shown in the figure), a pole element 1 and an insulating member 4.

[0015] The shell 3 includes a main body part and a cover part. The main body part has an opening. The cover part covers the opening of the main body part and together with the main body part, forms a receiving cavity.

[0016] like Figure 2 As shown, the pole element 1 is fixed to the housing 3. The pole element 1 is insulated from the housing 3 by an insulating member 4. The pole element 1 includes a conductive sheet 11 and N poles 12, wherein N≥2, and in the illustrated embodiment, N=2. The cover plate portion of the housing 3 is provided with through holes A, and each pole 12 corresponds to a through hole A, and at least a portion of the pole 12 passes through the corresponding through hole A and is fixed to the cover plate portion of the housing 3.

[0017] like Figure 3As shown, all poles 12 of the pole element 1 are integrally structured with the conductive sheet 11. All poles 12 of the pole element 1 have the same polarity, and can be positive poles or negative poles. All poles 12 of the pole element 1 are located on the same side of the conductive sheet 11, and one end of these poles 12 is connected to the conductive sheet 11, and the other end is relatively far away from the conductive sheet 11. All poles 12 of the pole element 1 are substantially parallel to each other.

[0018] The battery cell is located in the accommodating cavity of the shell 3. The battery cell includes a battery cell body and a tab. The battery cell body includes a positive electrode sheet, a negative electrode sheet and a diaphragm, and the diaphragm is located between the positive electrode sheet and the negative electrode sheet. The tab is led out from at least one end of the battery cell body and welded to the conductive sheet 11 of the pole element 1. The area of ​​the weld mark (indicated by M in the figure) between the conductive sheet 11 and the tab is S1. The cross-sectional area of ​​a single through hole A is S2, 0.04≤(N*S2) / S1≤1.2. The preferred range of S1 is: 50 mm 2 ≤S1≤300mm 2 , the specific value of S1 can be: 50mm 2 、60mm 2 , 70mm 2 、80mm 2 、90mm 2 , 100mm 2 , 120mm 2 、140mm 2 、160mm 2 、180mm 2 , 200mm 2 、220mm 2 , 240mm 2 , 260mm 2 、280mm 2 、300mm 2 Preferably, the range of S2 is 6 mm 2 ≤S2≤15mm 2 , the specific value of S2 can be: 6mm 2 , 7mm 2 , 8mm 2 , 9mm 2 , 10mm 2 、11mm 2 , 12mm 2 、13mm 2 , 14mm 2 , 15mm 2 .

[0019] Since the pole 12 and the conductive sheet 11 are an integrated structure, the welding area between the pole ear and the conductive sheet 11 is not affected by the welding area between the pole 12 and the conductive sheet 11. Under the premise of satisfying the overcurrent, the welding area between the pole ear and the conductive sheet 11 can be made larger. However, since the pole 12 and the conductive sheet 11 are an integrated structure, the heat transfer efficiency is high. If the welding area between the pole ear and the conductive sheet 11 is too large, the heat generated during welding is large. At this time, if the cross-sectional area of ​​the pole 12 is small, the heat cannot be released quickly, which will affect the insulation between the pole 12 and the shell 3. The edge member 4 is affected, and the cross-sectional area of ​​the pole 12 is determined by the cross-sectional area S2 of the through hole A on the shell 3 for penetrating the pole. By limiting the ratio of the total area (N*S2) of the plurality of through holes A on the shell 3 for penetrating the pole 12 to the welding area (S1) of the pole ear and the conductive sheet 11 within the range of 0.04-1.2, when the pole 12 and the conductive sheet 11 are an integrated structure, the pole ear and the conductive sheet 11 are welded to meet the overcurrent requirement, and the welding heat will not cause the insulating member 4 to overheat, melt, deform or fail.

[0020] Specifically:

[0021] If (N*S2) / S1 is too small, it means that S1 is too large or N*S2 is too small. If S1 is too large, a lot of welding heat will be generated when welding the conductive sheet 11 and the tab. Therefore, a lot of welding heat will be transferred to the insulating member 4, which will cause the insulating member 4 to overheat, melt, or deform and fail. If N*S2 is too small, the cross-sectional area of ​​the portion of the pole 12 passing through the through hole A is too small, resulting in a slow heat dissipation capacity of the welding heat generated when welding the conductive sheet 11 and the tab from the pole 12 to the outside, causing the insulating member 4 to overheat, melt, or deform and fail. 0.4≤(N*S2) / S1 ensures that when the welding area of ​​the tab and the conductive sheet 11 is constant, the product of the number of through holes N and the cross-sectional area S2 of the through hole has a lower limit value. Under the premise of not less than the lower limit value, the pole can quickly dissipate the heat of welding the tab and the conductive sheet 11, thereby avoiding the melting of the insulating member 4 caused by the welding heat generated when welding the conductive sheet 11 and the tab.

[0022] If (N*S2) / S1 is too large, it means that S1 is too small or N*S2 is too large. If S1 is too small, the welding area between the battery tab and the conductive sheet is too small, resulting in insufficient current capacity at the connection between the tab and the conductive sheet, and poor connection reliability between the tab and the conductive sheet 11, and poor electrical connection stability. If N*S2 is too large, the excessive weight of the pole 12 can easily cause the conductive sheet 11 to be uneven, making it difficult to weld the conductive sheet 11 and the tab. Moreover, when N*S2 is too large, it means that N is too large or S2 is too large or both N and S2 are too large, and the area of ​​the conductive sheet 11 is constant. Therefore, when N*S2 is too large, the distance between adjacent poles 12 is too small, resulting in poor strength of the shell 3 between adjacent poles 12, resulting in warping in the area where the through hole A of the shell 3 is set when fixing the shell 3 and the pole element 1, resulting in poor battery assembly quality. (N*S2) / S1≤1.2 ensures that when the welding area between the tab and the conductive sheet 11 is constant, the value of N*S2 has an upper limit, that is, the value of the number N will not be too large or the cross-sectional area S2 of the through hole will not be too large. This ensures that the welding heat between the tab and the conductive sheet 11 can be quickly dissipated to avoid affecting the insulating performance of the insulating member 4, while also ensuring that the battery has better current carrying capacity, better electrical connection stability and better assembly quality.

[0023] In some embodiments, the minimum thickness of the conductive sheet 11 is H, 50 mm 3 ≤H*S1≤300mm 3 The preferred range of H is: 0.8 mm ≤ H ≤ 2.5 mm, and the specific value of H can be: 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.5 mm.

[0024] The product of H and S1 is controlled within the above range, so that when the pole ear and the conductive sheet 11 are welded, the thickness of the conductive sheet 11 can be changed according to the change of the welding area between the pole ear and the conductive sheet 11, so that the conductive sheet 11 can also play an auxiliary heat dissipation role when the pole ear and the conductive sheet 11 are welded, so as to avoid that most of the heat is transferred to the pole 12 during welding, affecting the insulation effect of the insulating member 4 between the pole 12 and the shell 3, that is, when the welding area S1 between the conductive sheet 11 and the pole ear is small, the heat generated by welding is small, and the heat dissipation requirement for the conductive sheet 11 is small. At the same time, in order to improve the stability of the connection between the pole 12 and the shell 3, and to ensure the flatness of the conductive sheet 11, the thickness H of the corresponding conductive sheet 11 can be increased; and when the welding area between the pole ear and the conductive sheet 11 is too large, the heat generated during welding is large, and the heat dissipation requirement for the conductive sheet 11 is high. Therefore, the thickness H of the conductive sheet 11 needs to be smaller to improve the heat dissipation efficiency of the conductive sheet 11 and avoid heat concentration on the pole 12, thereby affecting the life of the insulating member 4. When the product of H and S1 is too small, it means that H is too small or S1 is too small or both H and S1 are too small. If H is too small, although the heat dissipation capacity of the conductive sheet 11 is improved, the current carrying capacity of the conductive sheet 11 is reduced, and the strength is reduced, thereby affecting the installation of the pole and the safety performance of the battery; if S1 is too small, that is, the welding area between the pole ear and the conductive sheet 11 is too small, S1 is too small, which will lead to a decrease in the current carrying capacity between the pole ear and the conductive sheet 11, and a decrease in the welding strength between the pole ear and the conductive sheet 11, which is prone to the pole ear breaking. Crack; when the product of H and S1 is too large, it means that H is too large or S1 is too large or both H and S1 are too large. If H is too large, the current carrying capacity of the conductive sheet 11 is improved, but the heat dissipation performance of the conductive sheet 11 is poor, and most of the heat will be transferred to the pole 12, thereby affecting the insulation performance of the insulating member 4. If S1 is too large, the heat generated during the welding of the pole ear and the conductive sheet 11 is too much, and the heat dissipation capacity of the conductive sheet 11 is limited. Most of the heat will still be transferred to the pole 12, thereby affecting the insulation performance of the insulating member 4.

[0025] In some embodiments, the minimum spacing of the orthographic projections of different poles 12 of the pole element 1 on the conductive sheet 11 is a, 20 mm ≤ a ≤ 100 mm. The specific value of a can be: 20 mm, 30 mm, 32 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm.

[0026] By controlling a within the above range, it is possible to avoid the heat of adjacent poles 12 affecting each other, thereby affecting the insulating part 4, and at the same time avoid the poles 12 being too close to each other, causing wrinkles on the surface of the shell 3 or excessive stress concentration leading to cracking. If a is too small, the heat from different poles 12 on the pole element 1 will be transferred to the insulating part 4 on the adjacent pole, causing the insulating part 4 of one pole 12 to receive too much heat during welding, which will cause the insulating part 4 to partially overheat and melt. If a is too large, in order to meet the welding requirements with the pole, the area of ​​the conductive sheet 11 must also be made relatively large, thereby occupying too much internal space of the shell 3, resulting in low energy density of the battery.

[0027] In some embodiments, the pole 12 includes a pole body 121 and a riveted flange 122, one end of the pole body 121 is connected to the conductive sheet 11, and the other end of the pole body 121 extends out of the housing 3 through the through hole A. The pole element 1 and the housing 3 are riveted together by the riveted flange 122. When welding the conductive sheet 11 and the pole ear, part of the welding heat can be dissipated into the air through the riveted flange 122, and the riveted flange 122 can increase the heat dissipation area, thereby playing a heat dissipation role.

[0028] In some embodiments, the cross-sectional area of ​​the riveted flange 122 is S3, 0.05≤(N*S3) / S1≤1.28. The preferred range of S3 is: 7 mm 2 ≤S3≤16mm 2 , the specific value of S3 can be: 7.0mm 2 , 7.5mm 2 , 8.0 mm 2 、8.6mm 2 、9.0mm 2 、9.5mm 2 , 10.0mm 2 , 10.5mm 2 、11.0mm 2 , 11.5mm 2 , 12.0mm 2 , 12.5mm 2 、13.0mm 2 , 13.5mm 2 、14.0mm 2 、14.5mm 2 、15.0mm 2 , 15.5mm 2 、16.0mm 2 .

[0029] By controlling (N*S3) / S1 within the above range, it can be ensured that the riveted flange 122 can provide heat dissipation capability and prevent the heat from the pole 12 from melting the insulating part 4 and affecting the insulation performance, while preventing the riveted flange 122 from being too large and thus affecting the installation of the adjacent pole 12. In addition, an overly large riveted flange 122 has poor flatness, which will affect the welding of the conductive bar and the pole during the subsequent battery grouping and easily cause cold welding. When (N*S3) / S1 is too small, it means that N*S3 is too large or S1 is too small; if N*S3 is too large, the area of ​​the riveted flange 122 will be too large, affecting the installation of the adjacent pole 12. At the same time, the flatness of the riveted flange 122 is poor, which can easily cause cold welding between the conductive bar and the pole when the battery is grouped; when (N*S3) / S1 is too large, it means that N*S3 is too small or S1 is too large. If N*S3 is too small, the heat of the pole 12 cannot be quickly dissipated through the riveted flange 122, which will affect the insulating component 4 and reduce the insulating effect of the insulating component 4.

[0030] In some embodiments, the battery includes an output member 2, the pole 12 is electrically connected to the output member 2, and the output member 2 is used to electrically connect to the tab of the battery pack, so that the pole 12 is indirectly electrically connected to the tab of the battery pack through the output member 2. Of course, the output member 2 may not be provided, and when the output member 2 is not provided, the pole 12 is directly electrically connected to the tab of the battery pack.

[0031] In the illustrated embodiment, an output member 2 is provided, and a pole body 121 is provided with a large diameter section 121a and a small diameter section 121b. One end of the large diameter section 121a is connected to the conductive sheet 11, and the small diameter section 121b is connected between the other end of the large diameter section 121a and the riveted flange 122. The intersection of the large diameter section 121a and the small diameter section 121b forms a first riveted step surface B, and the intersection of the small diameter section 121b and the riveted flange 122 forms a second riveted step surface C. The output member 2 is at least partially located between the first riveted step surface B and the second riveted step surface C, and is riveted to the pole 12 through the first riveted step surface B and the second riveted step surface C.

[0032] In some embodiments, in the thickness direction of the conductive sheet 11, the minimum spacing between the insulating part 4 and the weld mark is b, and the range of b is 5mm≤b≤50mm. The specific value of b can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, or 50mm. When b is controlled within the above range, the insulating member 4 is at a certain distance from the welding mark of the pole ear and the conductive sheet 11, and the heat during welding of the pole ear and the conductive sheet 11 will be lost during the transmission process, which means that: the minimum spacing between the insulating member 4 and the welding mark of the pole ear and the conductive sheet 11 is b within this range, and the range of (N*S2) / S1 can be further narrowed to 0.1≤(N*S2) / S1≤1.2, that is, for S1 of the same size, when b is within the above range, the through-hole area S2 corresponding to a single pole 12 can be reduced while the number of poles 12 remains unchanged, so as to ensure the fixing strength between the pole and the shell, and the shell will not crack due to stress concentration; when b is too small, the insulating member 4 is too close to the welding mark, and the heat is not easy to be lost. The larger b is, the smaller the adverse effect of welding heat on the insulating member, but b is too large, which will cause the current path to be too long, the resistance to be too large, and the current capacity to be insufficient. At the same time, too large b will affect the installation space of the battery cell inside the battery and reduce the energy density of the battery.

[0033] In some embodiments, the orthographic projection of the pole 12 on the conductive sheet 11 at least partially overlaps with the weld marks of the conductive sheet 11 and the pole ear. With this design, the current transmission path is shorter and the resistance is smaller, which is beneficial to improving the current capacity of the battery. In the case of overlap, the heat transmission path is shorter, and the welding heat has a greater impact on the insulating member 4. Therefore, the value of (N*S2) / S1 cannot be too small, so the lower limit of (N*S2) / S1 needs to be increased, that is, under the premise that the number of through holes N is constant, the through hole area S2 needs to be increased, or under the premise that the through hole area S2 is constant, the number of through holes N needs to be increased. For example, the range of (N*S2) / S1 can be further narrowed to 0.15≤(N*S2) / S1≤1.2.

[0034] In some embodiments, the orthographic projection of the pole 12 on the conductive sheet 11 does not overlap with the welding mark of the conductive sheet 11 and the pole ear, for example Figure 3In the embodiment, the welding mark of the conductive sheet 11 and the tab is located between the orthographic projections of the two poles 12 on the conductive sheet 11. With this design, the path for the welding heat of the tab and the conductive sheet 11 to be transferred to the insulating member 4 through the pole 12 is longer, so it is more conducive to reducing the adverse effects of the welding heat on the insulating member 4. In the case of no overlap, the effect of the welding heat on the insulating member 4 is smaller, so the value of (N*S2) / S1 can be smaller, so the upper limit of (N*S2) / S1 can be smaller, that is, when the welding area S1 of the tab and the conductive sheet 11 is constant, the value of N*S2 can be smaller, that is, the value of the number N can be smaller or the value of the cross-sectional area S2 of a single pole 12 to the shell through hole can be smaller, for example, the range of (N*S2) / S1 can be further narrowed to 0.04≤(N*S2) / S1≤1.0.

[0035] In some embodiments, the housing 3 is roughly rectangular, the long side of the rectangle is the length direction of the battery, and the short side of the rectangle is the width direction of the battery. All poles 12 of the pole element 1 are arranged in sequence in the width direction of the battery, so that the length of the pole element 1 in the length direction of the battery is small, so that the size of the battery body in the length direction of the battery can be set larger, which is more conducive to improving the energy density of the battery.

[0036] In some embodiments, the conductive sheet 11 is provided with a corresponding fuse structure 11c near at least one pole 12. Specifically, the fuse structure 11c may be provided near each pole 12, or may be provided near one or several poles 12. When the orthographic projections of different poles 12 of the pole element 1 on the conductive sheet 11 are at different distances from the weld marks of the conductive sheet 11 and the pole lug, the fuse structure 11c is provided at least near the pole 12 closest to the weld mark, because the welding heat is most concentrated near the pole 12 closest to the weld mark, and overcurrent is most likely to occur. Once overcurrent occurs, the conductive sheet 11 is disconnected at the fuse structure 11c to prevent the overcurrent from spreading to the battery cell, thereby reducing the risk of thermal runaway of the battery.

[0037] In the illustrated embodiment, the fuse structure 11c is a through hole, which passes from the side of the conductive sheet 11 where the pole 12 is provided to the side where the conductive sheet 11 is connected to the pole lug. In other embodiments, the fuse structure 11c may also be a thinning area, the thickness of which is less than the thickness of other areas of the conductive sheet 11, and the thinning area may be formed by stamping, notching, or cutting.

[0038] In the illustrated embodiment, Figure 5As shown, the conductive sheet 11 has a thick area 11a and a thin area 11b. The orthographic projections of all the poles 12 of the pole element 1 on the conductive sheet 11 fall within the thick area 11a, so that the strength of the connection between the pole 12 and the conductive sheet 11 is higher. The fuse structure 11c is arranged in the thin area 11b, so that when an overcurrent occurs in the battery, the fuse is blown more quickly, which is more conducive to reducing the risk of thermal runaway of the battery.

[0039] In the illustrated embodiment, the insulating member 4 includes a first insulating portion 41 and a second insulating portion 42, and the first insulating portion 41 and the second insulating portion 42 are independent of each other. In other embodiments, the first insulating portion 41 and the second insulating portion 42 may also be integrated together. The number of the first insulating portions 41 is consistent with the number of the poles 12 of the pole element 1. The first insulating portion 41 has a sleeve portion and an annular protrusion located on the outer periphery of the sleeve portion. The sleeve portion of each first insulating portion 41 is respectively sleeved outside a pole 12 and is located in a through hole A of the housing 3, and the annular protrusion of each first insulating member 4 is located between the conductive sheet 11 and the inner side of the housing 3, so that the pole element 1 and the housing 3 are insulated from each other. The second insulating portion 42 is at least partially located between the output member 2 and the outer side of the housing 3, so that the output member 2 and the housing 3 are insulated from each other.

[0040] The above specific examples are used 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 ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the present application.

Claims

1. A battery, characterized in that The invention comprises a shell (3), a pole element (1), an insulating member (4), and a battery cell located in the shell (3), wherein the pole element (1) is fixed to the shell (3), the pole element (1) and the shell (3) are insulated by the insulating member (4), the pole element (1) comprises a conductive sheet (11) and N poles (12) located on the same side of the conductive sheet (11), N≥2, the N poles (12) have the same polarity and are an integral structure with the conductive sheet (11), the battery cell comprises a pole ear, the conductive sheet (11) is welded to the pole ear and the weld print area is S1, the shell (3) is provided with a through hole (A), each pole (12) corresponds to a through hole (A), the pole (12) at least partially passes through the corresponding through hole (A), the cross-sectional area of ​​the through hole (A) is S2, 0.04≤(N*S2) / S1≤1.2; 50 mm 2 ≤S1≤300mm 2 ; 6 mm 2 ≤S2≤15mm 2 .

2. The battery according to claim 1, characterized in that The minimum thickness of the conductive sheet (11) is H, 50 mm 3 ≤H*S1≤300mm 3 .

3. The battery according to claim 1, characterized in that The minimum spacing a between the orthographic projections of different poles (12) of the pole element (1) on the conductive sheet (11) is 20 mm ≤ a ≤ 100 mm.

4. The battery according to claim 1, characterized in that The pole (12) comprises a pole body (121) and a riveted flange (122); one end of the pole body (121) is connected to the conductive sheet (11); the other end of the pole body (121) passes through the through hole (A) and extends outside the shell (3); the riveted flange (122) is arranged at one end of the pole body (121) located outside the shell (3); and the pole element (1) is riveted to the shell (3) via the riveted flange (122).

5. The battery according to claim 4, characterized in that The cross-sectional area of ​​the riveted flange (122) is S3, 0.05≤(N*S3) / S1≤1.

28.

6. The battery according to claim 1, characterized in that In the thickness direction of the conductive sheet (11), the minimum spacing between the insulating member (4) and the weld mark is b, 5 mm ≤ b ≤ 50 mm, 0.1 ≤ (N*S2) / S1 ≤ 1.

2.

7. The battery according to claim 1, characterized in that The orthographic projection of the pole (12) on the conductive sheet (11) does not overlap with the weld mark, and 0.04≤(N*S2) / S1≤1.

0.

8. The battery according to claim 1, characterized in that The orthographic projection of the pole (12) on the conductive sheet (11) at least partially overlaps with the weld mark, and 0.15≤(N*S2) / S1≤1.

2.

9. The battery according to any one of claims 1 to 8, characterized in that: The conductive sheet (11) is provided with a fuse structure (11c).

10. The battery according to claim 9, characterized in that The conductive sheet (11) has a thick region (11a) and a thin region (11b); the orthographic projections of all the poles (12) of the pole element (1) on the conductive sheet (11) all fall within the thick region (11a); and the fuse structure (11c) is arranged in the thin region (11b).

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