Battery and shell assembly thereof

Abstract

The invention relates to the technical field of batteries, and discloses a battery and a shell assembly thereof, and the shell assembly comprises a top cover provided with a mounting hole; the electrode piece penetrates through the mounting hole, the electrode piece comprises a pole part, a connecting part and a fixing part, one end of the pole part is connected with one end of the connecting part, a groove is formed in the other end of the connecting part, the fixing part is arranged at an opening of the groove, the fixing part is arranged around the connecting part, the fixing part is located on one side of the plate face of the top cover, and the fixing part is used for being electrically connected with the tab; the connecting plate is arranged on the other side of the plate surface of the top cover, the connecting plate is welded on the pole part to form a welding part, and the connecting plate is used for being electrically connected with the busbar; wherein the thickness of the groove wall of the groove is t mm, the depth of the welding part is h1 mm, and t / h1 is larger than or equal to 0.25 and smaller than or equal to 3. According to the invention, external overcurrent and internal overcurrent can be balanced, so that the phenomenon of local overheating is avoided, and insulation or sealing failure of an insulating part and a sealing part is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, in particular to a battery and a top cover thereof. Background Art

[0002] At present, the battery is equipped with electrode parts, which are connected to the busbar and the battery cell tabs inside the battery to achieve internal and external overcurrent of the battery. However, the battery currently has the problem of uneven internal and external overcurrent, which is easy to cause local overheating. The insulating parts and sealing parts around the electrode parts will soften due to overheating, resulting in insulation or sealing failure. Summary of the invention

[0003] The purpose of the present invention is to provide a battery and a shell assembly thereof, which can balance the internal and external overcurrent of the battery and prevent the insulation or sealing failure of the insulating parts and sealing parts.

[0004] In order to achieve the above object, the present invention provides a battery housing assembly, comprising: A top cover, which is provided with a mounting hole, wherein the mounting hole penetrates the top cover along a thickness direction of the top cover; An electrode member, which is passed through the mounting hole, the electrode member includes a pole portion, a connecting portion and a fixing portion, one end of the pole portion is connected to one end of the connecting portion, and the other end of the connecting portion is provided with a groove, the fixing portion is provided at the opening of the groove, and the fixing portion is provided around the connecting portion, the fixing portion is located on one side of the plate surface of the top cover, the fixing portion is used to be electrically connected to the pole lug, the pole portion, the connecting portion and the fixing portion are integrally connected, and the fixing portion is provided to protrude in the extension direction of the top cover; A connecting plate, which is arranged on the other side of the plate surface of the top cover, the connecting plate is arranged around the outer peripheral side of the pole part, the connecting plate is welded to the outer peripheral side of the pole part to form a welding part, the connecting plate is used to be electrically connected to the busbar, the projection parts of the connecting plate and the fixing part on the top cover overlap, and the top cover is arranged between the connecting plate and the fixing part; The thickness of the groove wall of the groove is t mm, the depth of the welding portion is h1 mm, and the following condition is satisfied: 0.25≤t / h1≤3.

[0005] The present invention also provides a battery, comprising the above-mentioned shell assembly.

[0006] The present invention provides a battery and a housing assembly thereof, which have the following beneficial effects compared with the prior art: The shell assembly of the battery of the present invention includes a top cover, an electrode member and a connecting plate. The electrode member includes a pole portion and a connecting portion connected to each other. The connecting portion is provided with a groove and a fixing portion is provided at the opening of the groove. The connecting plate is welded to the pole portion to form a welding portion. The connecting plate is used to connect the bus, and the connecting portion is used to connect the pole ear. By limiting the depth of the welding portion and the thickness of the connecting portion corresponding to the groove position, the overcurrent at these two places can be balanced, thereby balancing the external overcurrent and the internal overcurrent, avoiding the phenomenon of local overheating, and preventing the insulation or sealing failure of the insulating member and the sealing member.

[0007] The battery of the present invention includes the above-mentioned shell assembly, which can balance the external overcurrent and the internal overcurrent, avoid the phenomenon of local overheating, and prevent the insulation or sealing failure of the insulating parts and sealing parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Schematic diagram of the structure of the housing assembly according to an embodiment of the present invention.

[0009] Figure 2 yes Figure 1 Section view in AA direction.

[0010] Figure 3 yes Figure 2 A magnified schematic diagram of point B in the middle.

[0011] Figure 4 yes Figure 1 Disassembled view of the middle housing assembly.

[0012] Figure 5 Schematic diagram of the structure of the electrode component according to an embodiment of the present invention.

[0013] Figure 6 2 is a schematic structural diagram of an electrode component according to an embodiment of the present invention from another angle.

[0014] Figure 7 yes Figure 3 A structural schematic diagram of another connecting plate assembly state.

[0015] Figure 8 Schematic diagram of a battery cell and a shell assembly according to an embodiment of the present invention.

[0016] Fig. 9 yes Figure 8 Enlarged schematic diagram of point C in the middle.

[0017] Fig.10 yes Figure 8 Schematic diagram of the structure from another angle.

[0018] In the figure, 1, top cover; 2, electrode part; 3, connecting plate; 4, insulating part; 5, sealing part; 6, battery cell; 7, busbar; 21, pole part; 22, connecting part; 23, fixing part; 24, groove; 31, welding part; 33, protrusion; 41, pole ear. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0023] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Please refer to Figure 1 and Figure 4 A top cover 1 assembly of a battery according to a preferred embodiment of an embodiment of the present invention comprises: a top cover 1, an electrode member 2 and a connecting plate 3.

[0025] The top cover 1 is provided with a mounting hole, and the mounting hole penetrates the top cover 1 along the thickness direction of the top cover 1 .

[0026] The top cover 1 is the top cover 1 of the battery. The battery also includes a shell. The battery cell 6 is arranged in the shell. The top cover 1 is covered on the shell.

[0027] Please refer to Figure 5 and Figure 6 The electrode member 2 is passed through the mounting hole, and the electrode member 2 includes a pole portion 21, a connecting portion 22 and a fixing portion 23. One end of the pole portion 21 is connected to one end of the connecting portion 22, and the other end of the connecting portion 22 is provided with a groove 24. The fixing portion 23 is arranged at the opening of the groove 24, and the fixing portion 23 is arranged around the connecting portion 22. The fixing portion 23 is located on one side of the plate surface of the top cover 1. The fixing portion 23 is used to be electrically connected to the pole ear 41. The pole portion 21, the connecting portion 22, and the fixing portion 23 are integrally connected, and the fixing portion 23 is protrudingly arranged in the extension direction of the top cover 1.

[0028] The electrode member 2 is used to electrically connect the battery cell 6 to external equipment. The electrode member 2 is divided into a positive electrode member 2 and a negative electrode member 2 with different polarities. Each battery can have multiple positive electrode members 2 or negative electrode members 2. In this embodiment, one positive electrode member 2 and one negative electrode member 2 are provided. In the specific production implementation, the number and position of the electrode members 2 can be set as needed.

[0029] The extension direction of the top cover 1 may refer to the length direction of the top cover 1 or the width direction of the top cover 1 . The top cover 1 extends in a plane, and the fixing portion 23 extends in this plane, forming a protruding arrangement of the fixing portion 23 on the entire electrode member 2 .

[0030] The fixing part 23 is used to be electrically connected to the pole lug 41, and the current flows to the electrode member 2 through the fixing part 23 to achieve internal overcurrent. Specifically, the current flows from the fixing part 23 to the connecting part 22, and then to the pole part 21. The fixing part 23 is also used to be indirectly connected to the top cover 1.

[0031] The connecting plate 3 is arranged on the other side of the plate surface of the top cover 1, and is arranged around the outer peripheral side of the pole part 21. The connecting plate 3 is welded to the outer peripheral side of the pole part 21 to form a welding part 31. The connecting plate 3 is used to be electrically connected to the bus 7. The projection parts of the connecting plate 3 and the fixing part 23 on the top cover 1 overlap, and the top cover 1 is arranged between the connecting plate 3 and the fixing part 23.

[0032] After the electrode member 2 passes through the top cover 1 , the connecting plate 3 is required to provide support force for the electrode member 2 .

[0033] The welding part 31 is formed after the electrode member 2 and the connecting plate 3 are welded and the molten pool is cooled. A part of the welding part 31 is on the connecting plate 3, and a part of the welding part 31 is on the electrode member 2.

[0034] The connecting plate 3 is electrically connected to the busbar 7 to realize external overcurrent. Specifically, the current on the electrode member 2 flows to the connecting plate 3 through the welding portion 31 , and then flows from the connecting plate 3 to the busbar 7 .

[0035] Providing the groove 24 on the pole part 21 can reduce the weight of the electrode component 2, thereby ensuring the connection strength between the connecting plate 3 and the pole part 21, and avoiding the risk of excessive connection strength between the fixing part 23 and the pole ear 41, which may cause the welding part 31 between the connecting plate 3 and the pole part 21 to tear and cause connection failure.

[0036] The fixing portion 23 is protruded from the entire electrode member 2, and the top cover 1 is disposed between the connecting plate 3 and the fixing portion 23. With such a structure, the top cover 1 is sandwiched between the fixing portion 23 and the connecting plate 3, and the relative position between the entire electrode member 2 and the top cover 1 can be limited.

[0037] Please refer to Figure 2 and Figure 3 , the thickness of the corresponding position of the connecting portion 22 and the groove 24 is t mm, that is, the thickness of the groove wall of the groove 24 is t mm, and the depth of the welding portion 31 is h1 mm, which satisfies: 0.25≤t / h1≤3. Preferably, t / h1 can be 0.5, 0.8, 1, 1.3, 1.6, 2, 2.1, 2.4, 2.8, etc.

[0038] In this embodiment, the groove wall of the groove 24 is parallel to the thickness direction of the top cover 1 , the opening of the groove 24 faces the direction where the battery core 6 is located, and the opening is opened along the thickness direction of the top cover 1 .

[0039] Usually, multiple batteries are combined into a battery pack, and the batteries are connected together through a busbar to form a battery pack. The busbar gathers the current in each battery and conducts the current output by the battery pack.

[0040] When the external overcurrent and the internal overcurrent are unbalanced, local overheating will occur in the connection area between the connecting plate 3 and the electrode member 2, causing the insulating member 4 to soften due to heat and insulation failure. During the internal overcurrent process, the position of the connecting portion 22 corresponding to the groove 24 is the overcurrent bottleneck, and during the external overcurrent process, the welding portion 31 is the overcurrent bottleneck. Therefore, when the above range is met, the overcurrent balance at the internal and external overcurrent bottlenecks can be achieved. If the value of t / h1 is too small, the internal overcurrent is too small to meet the overall overcurrent requirements of the battery, and if the value of t / h1 is too large, the overcurrent of the welding portion 31 is insufficient, and it is easy to generate heat locally at the weld mark, preventing the insulation or sealing failure of the insulating member 4 and the sealing member 5.

[0041] When measuring h1 and t, a general length measuring tool such as a vernier caliper may be used.

[0042] Specifically, for h1, the weld 31 may be sectioned, and the distance between the surface of the weld 31 on the section and the deepest part of the weld 31 may be measured. The average value may be taken after multiple measurements to obtain the depth h1 mm of the weld 31.

[0043] For t, the connection portion 22 can be cut open to measure the thickness of the corresponding position of the connection portion 22 and the groove 24 on the cross section, that is, the side wall thickness of the groove 24. The measurement is performed multiple times and the average value is taken to obtain the thickness t mm of the corresponding position of the connection portion 22 and the groove 24.

[0044] In some embodiments, the thickness t mm of the groove wall of the groove 24 also satisfies: 0.5≤t≤1.5. Preferably, t can be 0.8, 1, 1.2, etc.

[0045] During the internal overcurrent process, the position of the connecting portion 22 corresponding to the groove 24 is the overcurrent bottleneck. When the above range is met, it can ensure that the internal overcurrent meets the overall overcurrent requirement of the battery and prevent imbalance with the external overcurrent.

[0046] In some embodiments, the depth h1 mm of the welding portion 31 also satisfies: 0.5≤h1≤2. Preferably, h1 can also take values ​​such as 0.7, 1, 1.2, 1.5, 1.8, etc.

[0047] During the external overcurrent process, the welding portion 31 is the overcurrent bottleneck. When the above range is met, the connection can ensure that the internal overcurrent and the external overcurrent are balanced, and can ensure that the external overcurrent meets the overall overcurrent requirements of the battery.

[0048] In some embodiments, the dimension of the connecting plate 3 in the thickness direction of the top cover 1 is H mm, that is, the thickness of the connecting plate 3 is H mm, which satisfies: 0.16≤h1 / H≤1.33. Preferably, h1 / H can be 0.18, 0.2, 0.5, 0.7, 1, 1.1, 1.3, etc.

[0049] When this range is met, the depth of the welding portion 31 can be sufficient to ensure external flow, and excessive heat can be prevented from being transferred to the insulating member 4 and the sealing member 5 to prevent insulation failure or sealing failure.

[0050] In addition, H also satisfies: 1.5≤H≤3. Preferably, H can take values ​​such as 1.8, 1, 1.3, 1.6, 1.9, 2.2, 2.4, 2.8, etc.

[0051] When measuring H, a general length measuring tool such as a vernier caliper may be used.

[0052] Specifically, the connection plate 3 is taken, the distance between the two plate surfaces of the connection plate 3 is measured, and the average value is taken after multiple measurements to obtain the dimension H mm of the connection plate 3 in the thickness direction of the top cover 1 . In this embodiment, H is also the thickness of the connection plate 3 .

[0053] In some embodiments, the distance between the edge of the welding portion 31 on the connecting plate 3 and the other edge on the electrode member 2 is w mm, that is, the width of the welding portion 31 is w mm, satisfying: 0.5≤w≤2. Preferably, w can be 0.8, 0.9, 1.2, 1.5, 1.7, 1.9, etc.

[0054] When this range is met, the connection strength between the connection plate 3 and the pole part 21 can be ensured, and the depth of the welding part 31 can be prevented from being too deep.

[0055] When measuring w, a general length measuring tool such as a vernier caliper can be used.

[0056] Specifically, for w, the distance between the edge on the connecting plate 3 and the other edge on the pole part 21 is measured, and the measurement is repeated multiple times and the average value is taken to obtain the distance w mm between the edge of the welding portion 31 on the connecting plate 3 and the other edge on the pole part 21. In this embodiment, since the welding portion 31 is arranged around the pole part 21, w is also the width of the welding portion 31 as a weld.

[0057] In some embodiments, the connecting plate 3 is annular, and the distance between the outer circumference of the connecting plate 3 and the inner circumference of the connecting plate 3 is L mm, that is, the ring width of the connecting plate 3 is L mm, which satisfies: 0.125≤w / L≤1. Preferably, w / L can be 0.2, 0.4, 0.6, 0.9, etc.

[0058] When the above range is met, while ensuring the connection strength between the connecting plate 3 and the electrode member 2, it is also possible to ensure that the distance between the welding portion 31 and the insulating member 4 is far enough to prevent the insulating member 4 from softening due to heat and causing insulation failure.

[0059] In addition, L also satisfies: 2≤L≤4. Preferably, L can take values ​​such as 2.3, 2.5, 2.7, 3, 3.2, 3.5, 3.9, etc.

[0060] When measuring L, a general length measuring tool such as a vernier caliper may be used.

[0061] Specifically, for L, the distance between the outer circumference and the inner circumference of the connecting plate 3 is measured, and the measurement is repeated multiple times and the average value is taken to obtain the distance L mm between the outer circumference of the connecting plate 3 and the inner circumference of the connecting plate 3. In this embodiment, the connecting plate 3 is annular, and L is also the width of the connecting plate 3.

[0062] In some embodiments, a protrusion 33 is provided on the connecting plate 3 , and a surface of the protrusion 33 facing away from the top cover 1 is located on a side of the electrode member 2 facing away from the connecting plate 1 .

[0063] In other words, Figure 3In terms of the viewing direction in FIG. 1 , the upper surface of the protrusion 33 is higher than the electrode member 2 to facilitate welding with the busbar.

[0064] It is worth mentioning here that please refer to Figure 7 , H refers to the thickness of the connecting plate excluding the protrusion 33.

[0065] In some embodiments, the pole portion 21 is made of aluminum, and the connection portion 22 is made of copper.

[0066] In this embodiment, the pole part 21 is an aluminum pole, and the connecting part 22 and the fixing part 23 are integrally provided, that is, a copper pole with a flange shape. In other words, the electrode member 2 is a copper-aluminum composite electrode member 2 .

[0067] The thickness t mm of the groove wall of the groove 24 and the depth h1 mm of the welding portion 31 also satisfy: 0.28≤t / h1≤2.8. Preferably, t / h1 can be 0.3, 0.5, 0.8, 1, 1.3, 1.5, 1.8, 2, 2.3, 2.5, etc.

[0068] When this range is met, since copper has a high conductivity and good electrical conductivity, the thickness t of the corresponding position of the connecting portion 22 and the groove 24 can be appropriately reduced.

[0069] The dimension of the pole part 21 in the thickness direction of the top cover 1 is d mm, and the dimension of the position of the connection part 22 corresponding to the bottom of the groove 24 in the thickness direction of the top cover 1 is D mm, satisfying: 1≤d / D≤4. Preferably, d / D can be 1.3, 1.6, 1.9, 2, 2.3, 2.5, 2.7, 3, 3.2, 3.5, 3.9, etc.

[0070] Since the welding portion 31 is located on the pole portion 21 , that is, on the aluminum column, in order to meet the overcurrent requirement, it is necessary to limit the size range of the aluminum column and the copper column to meet 1≤d / D≤4.

[0071] In addition, d also satisfies: 2≤d≤4. Preferably, d can take values ​​such as 2.3, 2.6, 2.9, 3.1, 3.3, 3.5, 3.8, etc.

[0072] D also satisfies: 1≤d≤2. Preferably, D can take values ​​such as 1.2, 1.5, 1.6, 1.9, etc.

[0073] When measuring d and D, you can use common length measuring tools, such as ruler, tape measure, vernier caliper and other measuring tools.

[0074] Specifically, the electrode member 2 can be cut open, and the distance between the two edges of the pole portion 21 in the thickness direction of the top cover 1 on the cross section can be measured. The measurement is performed multiple times and the average value is taken to obtain the dimension d mm of the pole portion 21 in the thickness direction of the top cover 1. The dimension of the connecting portion 22 at the bottom of the groove 24 in the thickness direction of the top cover 1 on the cross section can be measured. The measurement is performed multiple times and the average value is taken to obtain the dimension D mm of the position of the connecting portion 22 corresponding to the bottom of the groove 24 in the thickness direction of the top cover 1.

[0075] This embodiment also provides a battery, please refer to Figure 8-Figure 10 , including a shell and the above-mentioned top cover 1 assembly.

[0076] The housing has an opening communicating with the interior thereof.

[0077] The top cover 1 of the shell assembly is arranged at the opening, the fixing portion 23 of the shell assembly is located inside the shell, the connecting plate 3 of the shell assembly is located outside the shell, and the opening of the groove 24 of the shell assembly faces the inside of the shell.

[0078] The battery configured in this way can balance the external overcurrent and the internal overcurrent, avoid the phenomenon of local overheating, and prevent the insulation or sealing failure of the insulating member 4 and the sealing member 5.

[0079] The battery further includes a battery cell 6 , which is disposed inside the shell. The battery cell 6 has a pole tab 41 , the width of the pole tab 41 is a mm, and the thickness of the pole tab 41 is b mm.

[0080] The battery cell 6 is formed by winding or stacking a positive electrode sheet, a negative electrode sheet and a separator. Both the positive electrode sheet and the negative electrode sheet have an area coated with active material and an area not coated with active material. The area not coated with active material forms a pole ear 41. The positive electrode sheet forms a positive pole ear 41, and the negative electrode sheet forms a negative pole ear 41.

[0081] The connecting plate 3 is annular, and the ring width L mm and the thickness H mm of the connecting plate 3 satisfy: 0.01≤(a*b) / (L*H)≤0.4. Preferably, (a*b) / (L*H) can be 0.1, 0.13, 0.15, 0.18, 0.2, 0.22, 0.24, 0.27, 0.3, 0.33, 0.36, 0.39, etc.

[0082] When the above range is met, the internal overcurrent and the external overcurrent can be further balanced, while avoiding the uneven connection strength between the electrode tab 41 and the connecting plate 3 and the electrode member 2, which may lead to connection failure.

[0083] Wherein, a also satisfies: 30≤a≤60. Preferably, a can take values ​​such as 34, 38, 42, 46, 49, 51, 56, 58, etc.

[0084] b also satisfies: 0.004≤b≤0.02. Preferably, b can be 0.007, 0.01, 0.013, 0.016, 0.019, etc.

[0085] When measuring a and b, a general length measuring tool such as a vernier caliper can be used.

[0086] Specifically, for a, the distance between the two edges of the tab 41 in the length direction of the top cover 1 is measured, and the average value is taken after multiple measurements to obtain the width a mm of the tab 41 .

[0087] Specifically, for b, the distance between the two surfaces of the tab 41 in the thickness direction of the top cover 1 is measured, and the average value is taken after multiple measurements to obtain the thickness b mm of the tab 41 .

[0088] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A battery housing assembly, characterized in that: include: A top cover, which is provided with a mounting hole, wherein the mounting hole penetrates the top cover along a thickness direction of the top cover; An electrode member, which is passed through the mounting hole, the electrode member includes a pole portion, a connecting portion and a fixing portion, one end of the pole portion is connected to one end of the connecting portion, and the other end of the connecting portion is provided with a groove, the fixing portion is provided at the opening of the groove, and the fixing portion is provided around the connecting portion, the fixing portion is located on one side of the plate surface of the top cover, the fixing portion is used to be electrically connected to the pole lug, the pole portion, the connecting portion and the fixing portion are integrally connected, and the fixing portion is provided to protrude in the extension direction of the top cover; A connecting plate, which is arranged on the other side of the plate surface of the top cover, the connecting plate is arranged around the outer peripheral side of the pole part, the connecting plate is welded to the outer peripheral side of the pole part to form a welding part, the connecting plate is used to be electrically connected to the busbar, the projection parts of the connecting plate and the fixing part on the top cover overlap, and the top cover is arranged between the connecting plate and the fixing part; The thickness of the groove wall of the groove is t mm, the depth of the welding portion is h1 mm, and the following condition is satisfied: 0.25≤t / h1≤3.

2. The battery housing assembly according to claim 1, characterized in that: The thickness t mm of the groove wall of the groove also satisfies: 0.5≤t≤1.

5.

3. The battery housing assembly according to claim 1, characterized in that: The depth h1mm of the welding portion also satisfies: 0.5≤h1≤2.

4. The battery housing assembly according to claim 1, characterized in that The thickness of the connecting plate is H mm, satisfying: 0.16≤h1 / H≤1.

33.

5. The battery housing assembly according to claim 1, characterized in that: The width of the welding portion is w mm, satisfying: 0.5≤w≤2, wherein the width of the welding portion is the distance between an edge of the welding portion located on the connecting plate and another edge located on the electrode member.

6. The battery housing assembly according to claim 5, characterized in that: The connecting plate is ring-shaped, and the ring width of the connecting plate is L mm, satisfying: 0.125≤w / L≤1.

7. The battery housing assembly according to claim 1, characterized in that: The connecting plate is provided with a protrusion, and a surface of the protrusion facing away from the top cover is located on a side of the electrode member facing away from the connecting plate.

8. The battery housing assembly according to claim 1, characterized in that: The pole portion is made of aluminum, and the connection portion is made of copper.

9. The battery housing assembly according to claim 8, characterized in that: The thickness t mm of the groove wall of the groove and the depth h1 mm of the welding portion also satisfy: 0.28≤t / h1≤2.

8.

10. The battery housing assembly according to claim 8, characterized in that: The dimension of the pole part in the thickness direction of the top cover is d mm, and the dimension of the connection part corresponding to the bottom of the groove in the thickness direction of the top cover is D mm, satisfying: 1≤d / D≤4.

11. A battery, characterized in that: include: The shell has an opening communicating with the interior of the shell; According to the shell assembly as described in any one of claims 1 to 10, the top cover of the top cover assembly is arranged at the opening, the fixing portion of the shell assembly is located inside the shell, the connecting plate of the shell assembly is located outside the shell, and the opening of the groove of the shell assembly faces the inside of the shell.

12. The battery according to claim 11, characterized in that include: A battery cell, which is arranged inside the shell, and the battery cell has a pole ear, the width of the pole ear is a mm, and the thickness of the pole ear is b mm; The connecting plate is ring-shaped, the ring width of the connecting plate is L mm, the thickness of the connecting plate is H mm, and the following condition is satisfied: 0.01≤(a*b) / (L*H)≤0.4.

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