A battery and a housing assembly thereof

Abstract

The application relates to the technical field of batteries, and discloses a battery and a shell assembly thereof, wherein the shell assembly comprises a top cover provided with a mounting hole; an electrode piece penetrating through the mounting hole, the electrode piece comprising a pole portion, a connecting portion and a fixing portion, one end of the pole portion being connected with one end of the connecting portion, the other end of the connecting portion being provided with a groove, the fixing portion being arranged at the opening of the groove and surrounding the connecting portion, the fixing portion being arranged on one side of the plate surface of the top cover and being used for electrically connecting with a tab; and a connecting plate arranged on the other side of the plate surface of the top cover, the connecting plate being welded on the pole portion and forming a welding portion, the connecting plate being used for electrically connecting with a bus bar; wherein 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 met: 0.25 <= t / h1 <= 3. According to the application, external overcurrent and internal overcurrent can be balanced, local overheating can be avoided, and insulation or sealing failure of insulation parts and sealing parts can be prevented.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery and its top cover. Background Technology

[0002] Currently, batteries are equipped with electrode components that connect to the busbar and the cell tabs inside the battery, thereby controlling internal and external overcurrent. However, current batteries suffer from uneven internal and external overcurrent, which can easily lead to localized overheating. The insulation and sealing components around the electrode components may soften due to overheating, resulting in insulation or sealing failure. Summary of the Invention

[0003] The purpose of this invention is to provide a battery and its casing assembly that can balance the internal and external overcurrent of the battery and prevent insulation or sealing failure of insulating and sealing components.

[0004] To achieve the above objectives, the present invention provides a battery housing assembly, comprising:

[0005] A top cover having mounting holes that penetrate the top cover along its thickness direction;

[0006] An electrode component is inserted through the mounting hole. The electrode component 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 disposed at the opening of the groove and surrounds the connecting portion. The fixing portion is located on one side of the top cover plate surface. The fixing portion is used for electrical connection with the electrode tab. The pole portion, the connecting portion, and the fixing portion are integrally connected. The fixing portion protrudes in the extending direction of the top cover.

[0007] A connecting plate is disposed on the other side of the top cover. The connecting plate is disposed around the outer periphery of the pole part. The connecting plate is welded to the outer periphery of the pole part to form a welded part. The connecting plate is used to connect to the busbar. The projection portions of the connecting plate and the fixing part on the top cover are overlapped. The top cover is disposed between the connecting plate and the fixing part.

[0008] The thickness of the groove wall is t mm, and the depth of the welded part is h1 mm, satisfying: 0.25≤t / h1≤3.

[0009] The present invention also provides a battery comprising the aforementioned housing assembly.

[0010] This invention provides a battery and its casing assembly, which, compared with the prior art, have the following advantages:

[0011] The battery casing assembly of the present invention includes a top cover, electrode components, and a connecting plate. The electrode components include a terminal post and a connecting part connected to each other. The connecting part has a groove and a fixing part is provided at the opening of the groove. The connecting plate is welded to the terminal post to form a welded part. The connecting plate is used to connect a busbar, and the connecting part is used to connect a tab. By limiting the depth of the welded part and the thickness of the connecting part corresponding to the groove position, the current flow at these two locations can be balanced, thereby balancing the external and internal current flow, avoiding local overheating, and preventing insulation or sealing failure of the insulating and sealing components.

[0012] The battery of the present invention, including the aforementioned housing assembly, can balance external and internal overcurrent, avoid local overheating, and prevent insulation or sealing failure of insulating and sealing components. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the housing assembly according to an embodiment of the present invention.

[0014] Figure 2 yes Figure 1 Sectional view along direction AA.

[0015] Figure 3 yes Figure 2 Enlarged diagram of point B in the middle.

[0016] Figure 4 yes Figure 1 Disassembly diagram of the middle housing assembly.

[0017] Figure 5 This is a schematic diagram of the structure of the electrode component according to an embodiment of the present invention.

[0018] Figure 6 This is a schematic diagram of the electrode component from another angle according to an embodiment of the present invention.

[0019] Figure 7 yes Figure 3 A structural diagram of another assembly state of the connecting plate.

[0020] Figure 8 This is a schematic diagram of the battery cell and housing assembly according to an embodiment of the present invention.

[0021] Figure 9 yes Figure 8 Enlarged diagram of point C in the middle.

[0022] Figure 10 yes Figure 8 A schematic diagram of the structure from another angle.

[0023] In the diagram, 1 is the top cover; 2 is the electrode component; 3 is the connecting plate; 4 is the insulating component; 5 is the sealing component; 6 is the battery cell; 7 is the busbar; 21 is the electrode post; 22 is the connecting part; 23 is the fixing part; 24 is the groove; 31 is the welding part; 33 is the protrusion; and 41 is the electrode tab. Detailed Implementation

[0024] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0025] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0028] Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Please refer to Figure 1 and Figure 4 A preferred embodiment of the present invention provides a battery top cover 1 assembly, comprising: a top cover 1, an electrode component 2, and a connecting plate 3.

[0030] The top cover 1 is provided with mounting holes that penetrate the top cover 1 along its thickness direction.

[0031] The top cover 1 is the top cover 1 of the battery. The battery also includes a housing, inside which the battery cell 6 is installed. The top cover 1 is placed on the housing.

[0032] Please refer to Figure 5 and Figure 6 The electrode 2 is inserted through the mounting hole. The electrode 2 includes a pole part 21, a connecting part 22 and a fixing part 23. One end of the pole part 21 is connected to one end of the connecting part 22, and the other end of the connecting part 22 is provided with a groove 24. The fixing part 23 is provided at the opening of the groove 24 and surrounds the connecting part 22. The fixing part 23 is located on one side of the plate surface of the top cover 1. The fixing part 23 is used to electrically connect with the electrode tab 41. The pole part 21, the connecting part 22 and the fixing part 23 are integrally connected. The fixing part 23 protrudes in the extending direction of the top cover 1.

[0033] Electrode 2 is used to electrically connect the battery cell 6 to external devices. Electrode 2 is divided into positive electrode 2 and negative electrode 2 with different polarities. Each battery can have multiple positive electrode 2 or negative electrode 2. In this embodiment, one positive electrode 2 and one negative electrode 2 are provided. In specific production implementation, the number and position of electrode 2 can be set as needed.

[0034] The extension direction of the top cover 1 can 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 part 23 extends in this plane, forming a protruding setting of the fixing part 23 on the entire electrode component 2.

[0035] The fixing part 23 is used for electrical connection with the electrode tab 41, and the current flows through the fixing part 23 to the electrode 2 to realize internal current flow. Specifically, the current flows from the fixing part 23 to the connecting part 22, and then to the electrode post 21. The fixing part 23 is also used for indirect connection to the top cover 1.

[0036] The connecting plate 3 is disposed on the other side of the plate surface of the top cover 1. The connecting plate 3 is disposed around the outer periphery of the pole post 21. The connecting plate 3 is welded to the outer periphery of the pole post 21 to form a welded part 31. The connecting plate 3 is used for electrical connection with the busbar 7. The projection portions of the connecting plate 3 and the fixing part 23 on the top cover 1 overlap. The top cover 1 is disposed between the connecting plate 3 and the fixing part 23.

[0037] After the electrode 2 passes through the top cover 1, the connecting plate 3 needs to provide support for the electrode 2.

[0038] The welded part 31 is formed after the molten pool cools following welding of the electrode 2 and the connecting plate 3. Part of the welded part 31 is on the connecting plate 3, and another part is on the electrode 2.

[0039] The connecting plate 3 is electrically connected to the busbar 7 to enable external current flow. Specifically, the current on the electrode 2 flows through the welding part 31 to the connecting plate 3, and then from the connecting plate 3 to the busbar 7.

[0040] The groove 24 provided on the electrode post 21 can reduce the weight of the electrode 2, thereby ensuring the connection strength between the connecting plate 3 and the electrode post 21. This avoids the risk of the connection failure caused by the welding part 31 of the connecting plate 3 and the electrode post 21 being torn due to excessive connection strength between the fixing part 23 and the electrode tab 41.

[0041] The fixing part 23 protrudes from the electrode component 2 as a whole, and the top cover 1 is disposed between the connecting plate 3 and the fixing part 23. With this structure, the top cover 1 is sandwiched between the fixing part 23 and the connecting plate 3, which can limit the relative position between the electrode component 2 as a whole and the top cover 1.

[0042] Please refer to Figure 2 and Figure 3 The thickness of the connecting part 22 at the corresponding position of the groove 24 is t mm, which means the thickness of the groove wall of the groove 24 is t mm. The depth of the welding part 31 is h1 mm, satisfying: 0.25≤t / h1≤3. Preferably, t / h1 can take values ​​such as 0.5, 0.8, 1, 1.3, 1.6, 2, 2.1, 2.4, 2.8, etc.

[0043] 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 cell 6 is located, and the opening is opened along the thickness direction of the top cover 1.

[0044] Typically, multiple batteries are combined into a battery pack, with each battery connected together via a busbar to form a battery array. The busbar collects the current from each battery and directs the current output from the battery array.

[0045] When the external and internal overcurrents are unbalanced, localized overheating occurs at the connection area between the connecting plate 3 and the electrode 2, causing the insulation component 4 to soften due to heat and leading to insulation failure. During internal overcurrent, the position of the connecting part 22 corresponding to the groove 24 becomes the overcurrent bottleneck. During external overcurrent, the welding part 31 becomes the overcurrent bottleneck. Therefore, when the above ranges are met, overcurrent balance can be achieved at the internal and external overcurrent bottlenecks. If the value of t / h1 is too small, the internal overcurrent is too small to meet the overall overcurrent requirements of the battery. If the value of t / h1 is too large, the overcurrent at the welding part 31 is insufficient, which can easily lead to localized heat generation at the solder joint, preventing insulation or sealing failure of the insulation component 4 and the sealing component 5.

[0046] When measuring h1 and t, a general length measuring tool, such as a vernier caliper, can be used.

[0047] Specifically, for h1, the welded part 31 can be cut open, and the distance between the surface of the welded part 31 and the deepest point of the welded part 31 on the cross-section can be measured. The average value of the measurements can be taken to obtain the depth h1mm of the welded part 31.

[0048] For t, the connecting part 22 can be cut open, and the thickness of the connecting part 22 and the groove 24 at the corresponding positions on the cross section can be measured, which is the side wall thickness of the groove 24. The average value is taken after multiple measurements to obtain the thickness t mm of the connecting part 22 and the groove 24 at the corresponding positions.

[0049] 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 take values ​​such as 0.8, 1, 1.2, etc.

[0050] During the internal overcurrent process, the position of the connecting part 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 requirements of the battery and prevent imbalance with the external overcurrent.

[0051] In some embodiments, the depth h1mm of the welded 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.

[0052] During the external current flow process, the welded part 31 is the current flow bottleneck. When the above range is met, the welded part can ensure the balance between internal and external current flow, and also ensure that the external current flow meets the overall current flow requirements of the battery.

[0053] 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, satisfying: 0.16≤h1 / H≤1.33. Preferably, h1 / H can take values ​​such as 0.18, 0.2, 0.5, 0.7, 1, 1.1, 1.3, etc.

[0054] When this range is met, the depth of the welded part 31 is sufficient to ensure external flow, while preventing excessive heat from being transferred to the insulating part 4 and the sealing part 5, thus preventing insulation or sealing failure.

[0055] Furthermore, 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.

[0056] When measuring H, a general length measuring tool, such as a vernier caliper, can be used.

[0057] Specifically, take the connecting plate 3, measure the distance between the two surfaces of the connecting plate 3, take multiple measurements and take the average value to obtain the dimension H mm of the connecting plate 3 in the thickness direction of the top cover 1. In this embodiment, H is also the thickness of the connecting plate 3.

[0058] In some embodiments, the distance between the edge of the welding part 31 on the connecting plate 3 and the other edge on the electrode 2 is w mm, that is, the width of the welding part 31 is w mm, satisfying: 0.5≤w≤2. Preferably, w can take values ​​such as 0.8, 0.9, 1.2, 1.5, 1.7, 1.9, etc.

[0059] When this range is met, the connection strength between the connecting plate 3 and the pole post 21 can be ensured, while preventing the welding part 31 from being too deep.

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

[0061] Specifically, for w, the distance between the edge of the connecting plate 3 and the other edge of the pole post 21 is measured. Multiple measurements are taken and the average value is calculated to obtain the distance w mm between the edge of the welding part 31 on the connecting plate 3 and the other edge of the pole post 21. In this embodiment, since the welding part 31 is arranged around the pole post 21, w is also the width of the welding part 31 as a weld.

[0062] In some embodiments, the connecting plate 3 is annular, and the distance between the outer circumferential surface and the inner circumferential surface of the connecting plate 3 is L mm, that is, the ring width of the connecting plate 3 is L mm, satisfying: 0.125≤w / L≤1. Preferably, w / L can take values ​​such as 0.2, 0.4, 0.6, 0.9, etc.

[0063] When the above range is met, the connection strength between the connecting plate 3 and the electrode 2 can be ensured, and the distance between the welding part 31 and the insulating part 4 can be ensured to be far enough to prevent the insulating part 4 from softening due to heat and causing insulation failure.

[0064] Furthermore, L also satisfies: 2≤L≤4. Preferably, L can take values ​​such as 2.3, 2.5, 2.7, 3, 3.2, 3.5, and 3.9.

[0065] When measuring L, a general length measuring tool, such as a vernier caliper, can be used.

[0066] Specifically, for L, the distance between the outer and inner circumferential surfaces of the connecting plate 3 is measured multiple times and the average value is taken to obtain the distance L mm between the outer and inner circumferential surfaces 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.

[0067] In some embodiments, the connecting plate 3 is provided with a protrusion 33, and the surface of the protrusion 33 facing away from the top cover 1 is located on the side of the electrode 2 facing away from the connecting plate 1.

[0068] In other words, with Figure 3In terms of the view orientation, the upper surface of the protrusion 33 is higher than the electrode 2 to facilitate welding with the busbar.

[0069] It is worth mentioning here that you should refer to Figure 7 H refers to the thickness of the connecting plate excluding the protrusion 33.

[0070] In some embodiments, the pole portion 21 is made of aluminum, and the connecting portion 22 is made of copper.

[0071] In this embodiment, the electrode post 21 is an aluminum post, and the connecting part 22 and the fixing part 23 are integrally formed, that is, a copper post with a flanged shape. In other words, the electrode 2 is a copper-aluminum composite electrode 2.

[0072] The thickness t mm of the groove wall of the groove 24 and the depth h1 mm of the welded part 31 also satisfy: 0.28≤t / h1≤2.8. Preferably, t / h1 can take values ​​such as 0.3, 0.5, 0.8, 1, 1.3, 1.5, 1.8, 2, 2.3, 2.5, etc.

[0073] When this range is met, because copper has a high conductivity coefficient and good conductivity, the thickness t at the corresponding position of the connecting part 22 and the groove 24 can be appropriately reduced.

[0074] The dimension of the pole post 21 in the thickness direction of the top cover 1 is d mm, and the dimension of the position of the connecting 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 take values ​​such as 1.3, 1.6, 1.9, 2, 2.3, 2.5, 2.7, 3, 3.2, 3.5, 3.9, etc.

[0075] Since the welded part 31 is located on the pole part 21, that is, on the aluminum pole, in order to meet the overcurrent requirements, the size range of the aluminum pole and the copper pole needs to be limited to 1≤d / D≤4.

[0076] Furthermore, 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, and 3.8.

[0077] D also satisfies: 1≤d≤2. Preferably, D can take values ​​such as 1.2, 1.5, 1.6, 1.9, etc.

[0078] When measuring d and D, general length measuring tools such as rulers, tape measures, and vernier calipers can be used.

[0079] Specifically, the electrode 2 can be cut open, and the distance between the two edges of the pole post 21 on the cross-section in the thickness direction of the top cover 1 can be measured. The average value of the measurements is taken multiple times to obtain the dimension d mm of the pole post 21 in the thickness direction of the top cover 1. The dimension D mm of the connecting part 22 at the bottom of the groove 24 on the cross-section in the thickness direction of the top cover 1 can be measured. The average value of the measurements is taken multiple times to obtain the dimension D mm of the position of the connecting part 22 corresponding to the bottom of the groove 24 in the thickness direction of the top cover 1.

[0080] This embodiment also provides a battery; please refer to [reference needed]. Figures 8-10 It includes the housing and the aforementioned top cover 1 assembly.

[0081] The shell has an opening that connects to its interior.

[0082] The top cover 1 of the housing assembly is located at the opening, the fixing part 23 of the housing assembly is located inside the housing, the connecting plate 3 of the housing assembly is located outside the housing, and the opening of the groove 24 of the housing assembly faces the inside of the housing.

[0083] This battery design allows for a balance between external and internal overcurrent, preventing localized overheating and ensuring the insulation or sealing of insulating component 4 and sealing component 5 does not fail.

[0084] The battery also includes a cell 6, which is disposed inside the casing. The cell 6 has a tab 41 with a width of a mm and a thickness of b mm.

[0085] The battery cell 6 is formed by winding or stacking positive electrode sheets, negative electrode sheets and separators. Both the positive electrode sheet and the negative electrode sheet have areas coated with active materials and areas not coated with active materials. The areas not coated with active materials form tabs 41. The positive electrode sheet forms a positive tab 41, and the negative electrode sheet forms a negative tab 41.

[0086] The connecting plate 3 is annular, with a ring width L mm and a thickness H mm, satisfying: 0.01 ≤ (a*b) / (L*H) ≤ 0.4. Preferably, (a*b) / (L*H) can take values ​​such as 0.1, 0.13, 0.15, 0.18, 0.2, 0.22, 0.24, 0.27, 0.3, 0.33, 0.36, and 0.39.

[0087] When the above range is met, the internal and external overcurrents can be further balanced, while avoiding uneven connection strength at the connection points of the tab 41 and the connecting plate 3 with the electrode 2, which could lead to connection failure.

[0088] Wherein, 'a' also satisfies: 30≤a≤60. Preferably, 'a' can take values ​​of 34, 38, 42, 46, 49, 51, 56, 58, etc.

[0089] b also satisfies: 0.004≤b≤0.02. Preferably, b can take values ​​such as 0.007, 0.01, 0.013, 0.016, 0.019, etc.

[0090] When measuring a and b, a general length measuring tool, such as a vernier caliper, can be used.

[0091] Specifically, for a, the distance between the two edges of the tab 41 along the length 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.

[0092] 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.

[0093] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A battery casing assembly, characterized in that, include: A top cover having mounting holes that penetrate the top cover along its thickness direction; An electrode component is inserted through the mounting hole. The electrode component 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 disposed at the opening of the groove and surrounds the connecting portion. The fixing portion is located on one side of the top cover plate surface. The fixing portion is used for electrical connection with the electrode tab. The pole portion, the connecting portion, and the fixing portion are integrally connected. The fixing portion protrudes in the extending direction of the top cover. A connecting plate is disposed on the other side of the top cover. The connecting plate is disposed around the outer periphery of the pole part. The connecting plate is welded to the outer periphery of the pole part to form a welded part. The connecting plate is used to connect to the busbar. The projection portions of the connecting plate and the fixing part on the top cover are overlapped. The top cover is disposed between the connecting plate and the fixing part. Wherein, the thickness of the groove wall is t mm, and the depth of the welded part is h1 mm, satisfying: 0.25 ≤ t / h1≤3; The width of the welded part is w mm, satisfying: 0.5 ≤ w ≤ 2, wherein the width of the welded part is the distance between the edge of the welded part located on the connecting plate and the other edge located on the electrode; The connecting plate is annular, and the ring width of the connecting plate is L mm, satisfying: 0.125 ≤ w / L ≤ 1; The thickness t mm of the groove wall also satisfies: 0.5 ≤ t ≤ 1.5; The depth h1mm of the welded part also satisfies: 0.5 ≤ h1 ≤ 2; At least a portion of the surface of the connecting plate opposite to the top cover is higher than the surface of the electrode opposite to the top cover.

2. The battery casing assembly according to claim 1, characterized in that... The thickness of the connecting plate is H mm, which satisfies: 0.16 ≤ h1 / H ≤ 1.

33.

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

4. The battery casing assembly according to claim 1, characterized in that, The pole portion is made of aluminum, and the connector portion is made of copper.

5. The battery casing assembly according to claim 4, characterized in that, The thickness t mm of the groove wall and the depth h1 mm of the welded part also satisfy: 0.28 ≤ t / h1 ≤ 2.

8.

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

7. A battery, characterized in that, include: The shell has an opening that connects to its interior; The housing assembly as claimed in any one of claims 1-6, wherein the top cover of the top cover assembly covers the opening, the fixing part of the housing assembly is located inside the housing, the connecting plate of the housing assembly is located outside the housing, and the opening of the groove of the housing assembly faces the inside of the housing.

8. The battery according to claim 7, characterized in that, include: A battery cell, disposed inside the housing, the battery cell having tabs, the tabs having a width of a mm and a thickness of b mm; The connecting plate is annular, with a ring width of L mm and a thickness of H mm, satisfying: 0.01 ≤ (a b) / (L) H) ≤ 0.4.

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