Adapter, top cover structure and battery

Abstract

The utility model relates to an adapter, a top cover structure and a battery, and relates to the field of energy storage. The adapter provided by the utility model is provided with a pole connecting area, and the pole connecting area is used for connecting the pole of the battery; the adapter surrounds the pole connecting area to form more than one welding area, and the welding areas are used for welding tabs; wherein the welding area extends along the extension direction of the pole connecting area, and the distances between all positions of the welding area and the pole connecting area are equal in the direction perpendicular to the extension direction of the pole connecting area. The adapter is provided with the pole connecting area, and the welding area is arranged to surround the pole connecting area, so that each position of the welding area is close to the pole connecting area, the area between the welding area and the pole connecting area is the overcurrent area, and current can flow to the pole connecting area through each position of the welding area, so that the overcurrent area is dispersed; and over-high local temperature caused by over-concentrated heating due to current is avoided, so that the safety performance of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an adapter, a top cover structure and a battery. Background Art

[0002] In the battery production process, the battery cell's tabs are generally connected to the adapter, and then the adapter is connected to the pole on the top cover, thereby achieving the connection between the battery cell and the top cover. The adapter is an indispensable and important component in the battery cell structure.

[0003] Since heat is generated when current passes through the adapter, especially under high current density conditions, the adapter may generate a high temperature due to resistance. Considering the impact of current on temperature, the traditional technology adopts the method of increasing the thickness of the adapter to increase the surface area of ​​the adapter, thereby reducing the current density per unit area, reducing the heat generated by the current, and lowering the temperature.

[0004] However, the increase in the thickness of the adapter will inevitably be accompanied by an increase in the mass of the entire battery, indirectly reducing the energy density of the battery. Summary of the invention

[0005] Based on this, it is necessary to provide an adapter, a top cover structure and a battery to address the problem of reducing battery energy density by increasing the thickness of the adapter in traditional technology.

[0006] In a first aspect, the present application provides an adapter, on which a pole connection area is provided; the adapter forms one or more welding areas around the pole connection area, and the welding areas are used to weld pole ears; wherein the welding areas extend along the extension direction of the pole connection area, and along the direction perpendicular to the extension direction of the pole connection area, the closest distance between the welding areas and the pole connection area is equal everywhere.

[0007] In one embodiment, there are multiple welding areas, and along a direction perpendicular to the extension direction of the pole connection area, the distances between all the welding areas and the pole connection area are equal.

[0008] In one embodiment, there are multiple welding areas, and the multiple welding areas are symmetrically arranged on both sides of the pole connection area.

[0009] In one embodiment, the pole connection area is an opening formed in the adapter, so that the pole can be inserted into the opening.

[0010] In one embodiment, the pole connection area is in a racetrack shape, and the welding area is a strip area extending along the length direction of the pole connection area.

[0011] In one embodiment, the pole connection area is in a rectangular shape, and the welding area is a strip area extending in the long side direction of the pole connection area.

[0012] In one embodiment, the shape of the pole connection area is circular or elliptical, and the welding area is an arc-shaped area extending along the circular edge of the pole connection area.

[0013] In one embodiment, the pole connection area is located in the central area of ​​the adapter.

[0014] In a second aspect, the present application further provides a top cover structure, the top cover structure comprising:

[0015] The above-mentioned adapter; and

[0016] A pole is fixedly connected to a pole connection area of ​​the adapter.

[0017] In a third aspect, the present application further provides a battery, comprising:

[0018] The two top cover structures are respectively a first top cover structure and a second top cover structure, the pole of the first top cover structure is a positive pole, and the pole of the second top cover structure is a negative pole;

[0019] More than one battery cell, the positive electrode tab of the battery cell is welded to the welding area of ​​the adapter in the first top cover structure, and the negative electrode tab of the battery cell is welded to the welding area of ​​the adapter in the second top cover structure.

[0020] In a fourth aspect, the present application also provides a battery module, which includes a plurality of the above-mentioned batteries.

[0021] In a fifth aspect, the present application also provides an electric device, which includes the battery or the battery module.

[0022] The adapter, top cover structure and battery are provided with a pole connection area on the adapter, and the welding area is provided to surround the pole connection area. Along the extension direction of the pole connection area, the closest distances of each position of the welding area to the pole connection area are equal everywhere, which makes the path of the current the same, disperses the current in the overcurrent area between the welding area and the pole connection area, and avoids the abnormal temperature rise caused by the current concentration on the side of the welding area close to the pole connection area in the traditional technology. The current can flow to the pole connection area through each position of the welding area, disperse the overcurrent area, avoid the local temperature being too high due to the excessive concentration of heat caused by the current, and thus improve the safety performance of the battery cell. Compared with the traditional technology of using thickened adapters to disperse the current, resulting in a decrease in the energy density of the battery, the adapter provided in the present application disperses the current by optimizing the position of the pole and the welding area, improves the safety performance of the battery cell while ensuring the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. 4 is a schematic diagram of the structure of a transition piece in an embodiment.

[0024] Figure 2 FIG. 4 is a top view of an adapter in one embodiment.

[0025] Figure 3 FIG. 4 is a schematic diagram of the structure of a transition piece in another embodiment.

[0026] Figure 4 FIG. 4 is a top view of a transition piece in another embodiment.

[0027] Figure 5 Schematic diagram of the structure of the top cover in one embodiment.

[0028] Figure 6 Schematic diagram of the top cover structure in another embodiment.

[0029] Description of reference numerals:

[0030] 10. Adapter; 11. Pole connection area; 12. Pole; 12-1. Positive pole; 12-2. Negative pole; 13. Welding area; 20-1. First top cover structure; 20-2. Second top cover structure; 30. Battery; 31. Battery cell; 32. Positive pole ear; 33. Negative pole ear; D. Current overflow area. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] In the current battery production process, the battery cell's tabs are generally connected to the adapter, and then the adapter is connected to the pole on the top cover, thereby achieving the connection between the battery cell and the top cover. The adapter is an indispensable and important component in the battery cell structure.

[0038] Since heat is generated when current passes through the adapter, especially under high current density conditions, the adapter may generate a high temperature due to resistance. In order to ensure the overcurrent temperature rise of the adapter, it is usually necessary to increase the thickness of the adapter, but the increase in the thickness of the adapter will inevitably be accompanied by an increase in the mass of the entire battery cell, which indirectly reduces the energy density of the battery cell (the ratio of the electrical energy stored in the battery to the mass of the battery, in units of Wh / kg);

[0039] The present application found that the solution adopted by the conventional technology is to set the welding position of the pole piece and the adapter on one side of the adapter, and the pole on the other side of the adapter, so that the formed overcurrent zone is located between the pole and the welding zone. In this case, since the distance between the welding part of the pole ear of the adapter and the pole connection area of ​​the adapter is different, and the current always tends to the area with the shortest path when moving in the conductor, the current of the pole ear passes through the overcurrent zone on the side of the welding area close to the pole, which leads to excessive concentration of the overcurrent zone, thereby increasing the temperature of the overcurrent zone and causing waste in the non-overcurrent (or less overcurrent) area.

[0040] See also Figure 1 , Figure 1 The schematic diagram of the structure of the adapter 10 in one embodiment of the present application is shown. The adapter 10 provided in one embodiment of the present application is provided with a pole connection area 11, and the pole connection area 11 is used to connect the pole 12; the adapter 10 surrounds the pole connection area 11 to form more than one welding area 13, and the welding area 13 is used to weld the pole lug. The welding area 13 extends along the extension direction of the pole connection area 11, and along the direction perpendicular to the extension direction of the pole connection area 11, the distance between each position of the welding area 13 and the pole connection area 11 is equal everywhere.

[0041] Among them, the tab refers to the cell tab, which is a metal sheet or sheet-like conductive structure connected to the positive or negative electrode of the cell, and the tab can be connected to the upper surface or lower surface of the adapter 10. The tab is used to connect the cell to an external circuit, transfer electrical energy and provide a safe electrical connection. The cell assembly inside the battery may include a plurality of cells, each cell including a positive tab and a negative tab. The pole refers to a structure for electrical connection to external components so that the battery can be powered by external components or charged. Optionally, the pole can be a columnar component made of metal or conductive material.

[0042] The extension direction of the pole connection area 11 refers to the extension direction based on the edge of its structure. If the pole connection area 11 is circular or elliptical, its extension direction is as follows: Figure 4 In the direction indicated by the arrow A; if the pole connection area 11 is a racetrack shape, its extension direction is as follows Figure 2 The direction indicated by the arrow A. The welding area 13 extends along the extension direction of the pole connection area 11, that is, the opposite sides of the welding area 13 and the pole connection area 11 are parallel to each other.

[0043] Along the direction perpendicular to the extension direction of the pole connection area 11, for the arc direction, it is the perpendicular direction corresponding to the tangent of each point in the arc direction; the distance between each position of the welding area 13 and the pole connection area 11 refers to the distance from the side of the welding area 13 facing the pole connection area 11 to the edge of the pole connection area 11. By setting the distance between each position of the welding area 13 and the pole connection area 11 to be equal everywhere, when the tab is connected to the welding area 13, no matter the current flows from the tab to the pole 12 or from the pole 12 to the tab, the distance between the welding area 13 of the tab and the adapter and the pole 12 at each location is equal, which makes the current pass through the same path, disperses the overcurrent area D, and thus achieves current dispersion, avoiding excessive local temperature caused by excessive current concentration.

[0044] The adapter 10 is a conductive member, and the pole 12 is arranged in the pole connection area 11 and can be electrically connected to the adapter 10. After the pole tab is welded to the welding area 13, the pole tab is electrically connected to the adapter, so that the pole tab is electrically connected to the pole 12, thereby realizing the electrical connection between the battery cell and the outside. Optionally, the pole tab can be welded by ultrasonic welding.

[0045] See also Figure 2 , Figure 2 A top view of the adapter 10 in one embodiment is shown. Since the welding area 13 is a structure surrounding the pole connection area 11, the area between the pole 12 and the entire welding area 13 forms a flow area D. Compared with the solution of the conventional technology where the flow area D is concentrated and the flow cross-sectional area is small, the flow cross-sectional area of ​​the flow area D of the present application is larger.

[0046] In the above adapter 10, a pole connection area 11 is provided on the adapter 10, and a welding area 13 is provided to surround the pole connection area 11. In a direction perpendicular to the extension direction of the pole connection area 11, the distance between each position of the welding area 13 and the pole connection area 11 is equal everywhere, so that the distance of the current is the same, so that the current in the overcurrent area D between the welding area 13 and the pole connection area 11 is dispersed, and the current in the conventional technology is avoided to be concentrated on the side of the welding area 13 close to the pole connection area 11, resulting in abnormal temperature rise. The current can flow to the pole connection area 11 through each position of the welding area 13, so that the overcurrent area D is dispersed, and the local temperature is avoided to be too high due to excessive concentration of heat caused by the current, thereby improving the safety performance of the battery cell.

[0047] In some feasible implementations, the adapter 10 is an integrally formed structure, and the pole connection area 11 can be an area located on the adapter 10. The pole connection area 11 does not penetrate the adapter 10, thereby ensuring the mechanical strength of the adapter 10. At this time, the pole ear extends upward from the side of the adapter 10 to the welding area.

[0048] In some other feasible implementations, the pole connection area 11 is an opening formed in the adapter 10, so that the pole 12 can be inserted into the opening. The adapter 10 is opened to form the pole connection area 11. At this time, the pole connection area 11 passes through the adapter 10. The opening can not only position the pole, but also connect the adapter 10 and the pole 12 by seam welding, thereby improving the welding effect.

[0049] In some feasible implementations, there may be more than two welding areas 13, and the distances between all welding areas 13 and the pole connection area 11 are equal, so that the current distribution of each overcurrent area can be uniform and the temperature rise of each overcurrent area can be consistent.

[0050] In a feasible implementation, a plurality of welding areas 13 surround the pole connection area 11 and are arranged at equal intervals. In this way, it is convenient to weld the pole lugs and the welding areas 13, and the equal interval arrangement can avoid the overlap of the flow areas, thereby achieving the dispersion of the flow areas.

[0051] In another feasible implementation, the multiple welding areas 13 are axially symmetrical or centrosymmetric. For example, when they are axially symmetrical, the axis where the center of the pole connection area 11 is located is the symmetry axis. For example, when they are centrosymmetric, the center of the pole connection area 11 is the symmetry center.

[0052] In some embodiments, multiple welding areas 13 are symmetrically arranged on both sides of the pole connection area 11. In this way, the welding areas 13 on both sides of the pole connection area 11 will not contact each other, and the tabs of multiple cells of the battery can be connected to the multiple welding areas 13 respectively, and the overcurrent area D formed between the welding area 13 and the pole connection area does not overlap each other, so as to avoid abnormal temperature increase caused by current concentration. Optionally, the number of welding areas 13 can be two, and the two welding areas 13 are relatively arranged on both sides of the pole connection area 11.

[0053] In a feasible implementation, the number of cells in the cell assembly is an even number, such as 2, 4 or 6, etc., wherein the tabs of half of the cells are connected to one welding area 13, and the tabs of the other half of the cells are connected to another welding area 13. In this way, the current of multiple cells is dispersed to avoid concentrated overheating.

[0054] In this embodiment, the welding areas 13 are symmetrically arranged so that the distances between the multiple welding areas 13 and the pole connection area 11 are equal. When the pole connection area 11 is provided with a pole 12 and the pole lugs are welded to the welding areas 13, the distances between each pole lug and the pole 12 are equal, so that the current is evenly distributed and abnormal temperature increase caused by excessive current concentration is avoided.

[0055] Continue to see Figure 1In some embodiments, the pole connection area 11 is in the shape of a racetrack, and the welding area is a strip area extending along the length direction of the pole connection area. The racetrack shape means that it has two parallel line segments, and both ends of the two line segments are connected by arcs. In other words, the racetrack shape means that the two sides are parallel line segments, and the two sides are symmetrical arc line segments.

[0056] When the shape of the pole connection area 11 is a runway shape, the welding area 13 is a strip area extending along the length direction of the pole connection area 11. That is, the welding area 13 extends in a direction parallel to the line segment of the pole connection area 11. Further, the shape of the pole connection area 11 can be a rectangle, and the welding area 13 is a strip area extending along the extension direction of the pole connection area 11, wherein the rectangle includes a square or a rectangle. When the adapter 10 is a square, the welding area 13 can be set on any side of the square; when the adapter 10 is a rectangle, the welding area 13 can be set in the long side direction of the rectangle and extend along the long side direction.

[0057] In some feasible implementations, when the shape of the pole connection area 11 is a square or a rectangle, the corners of the adapter 10 and / or the pole connection area 11 are rounded. Optionally, the adapter 10 is rounded; optionally, the corners of the pole connection area 11 are also rounded. On the one hand, setting the corners as rounded can reduce sharp edges and avoid the risk of damage and scratches that may be caused when installing or handling the battery 30; on the other hand, the rounded corners can avoid current concentration and avoid temperature rise.

[0058] See also Figure 3 , Figure 3 FIG. 1 is a schematic diagram of the structure of the adapter 10 in another embodiment. In some embodiments, the shape of the pole connection area 11 is circular or elliptical, and the welding area 13 is an arc-shaped area extending along the circular edge of the pole connection area 11. Figure 4 , Figure 4 A top view of a transition piece 10 in another embodiment is shown, wherein the fan-shaped area between the arc-shaped welding area 13 and the circular pole connection area 11 is the flow area D.

[0059] Furthermore, the adapter 10 may be a structure obtained after processing based on the circular structure, such as Figure 3 As shown, a portion of the structure on both sides of the circular structure is removed to form a recess, and the welding area 13 is arranged on both sides of the non-recess, so that the adapter 10 is easy to assemble to the top cover.

[0060] In some embodiments, the pole connection area 11 is located at the top center area of ​​the adapter 10. Optionally, when the adapter 10 and the pole connection area 11 are both rectangular structures, the center of the pole connection area 11 coincides with the center of the adapter 10, and the extension direction of the pole connection area 11 is consistent with the extension direction of the adapter 10. At this time, the shape of the pole connection area 11 can be regarded as a proportional reduction of the adapter 10. Optionally, the adapter 10 is a circular structure or a structure processed from a circular structure. When the pole connection area 11 is a circular structure, the center of the pole connection area 11 and the adapter 10 coincide.

[0061] In this arrangement, the pole connection area 11 is located at the center of the adapter 10, which facilitates the arrangement of a surrounding welding area 13 around the pole connection area 11. The welding areas 13 are compactly distributed, which reduces the area of ​​the adapter and facilitates assembly.

[0062] See also Figure 5 , Figure 5 The top cover structure in one embodiment is shown. The top cover structure includes an adapter 10 and a pole 12. The pole 12 is arranged in the pole connection area 11 of the adapter 10 and is fixedly connected to the pole connection area 11. Figure 6 , Figure 6 A schematic diagram of the top cover structure in another embodiment is shown. Optionally, the pole 12 can be arranged in the pole connection area 11 by welding.

[0063] Optionally, the pole 12 may have the same size and shape as the pole connection area 11. For example, when the pole connection area 11 is in a racetrack shape, the pole 12 is also in a racetrack shape; when the pole connection area 11 is in a rectangular shape, the pole 12 is also in a rectangular shape; when the pole connection area 11 is in a circular shape, the pole 12 is also in a circular shape, and it is ensured that the pole 12 can be connected to the pole connection area 11.

[0064] Furthermore, when the pole connection area 11 is an opening, the size of the pole 12 may be slightly smaller than the pole connection area 11 , so that the pole 12 can be embedded in the pole connection area 11 to achieve connection between the pole 12 and the adapter 10 .

[0065] Continue to see Figure 5 and Figure 6The present application also provides a battery 30, including two top cover structures and one or more battery cells 31. The two top cover structures are respectively a first top cover structure 20-1 and a second top cover structure 20-2. The first top cover structure 20-1 is provided with a positive electrode column 12-1, and the second top cover structure 20-2 is provided with a negative electrode column 12-2. The positive electrode tab 32 of the battery cell 31 is welded to the welding area 13 of the adapter 10 in the first top cover structure 20-1, and the negative electrode tab 33 of the battery cell 31 is welded to the welding area 13 of the adapter in the second top cover structure 20-2. It should be noted that the top cover structure in the present application is a structure including an adapter and a pole. The two top cover structures can be arranged on the same top cover sheet or on different top cover sheets. Both are conventional designs and will not be described in detail here.

[0066] When there are multiple battery cells 31, the positive electrode tabs 32 of the multiple battery cells 31 are all welded to the welding area 13 of the first top cover structure 20-1, and are electrically connected to the outside through the positive electrode column 12 located on the first top cover structure 20-1, and the negative electrode tabs 33 of the multiple battery cells 32 are all welded to the welding area 13 of the second top cover structure-2, and are electrically connected to the outside through the negative electrode column located on the second top cover structure 20-2.

[0067] In a feasible implementation, the number of cells in the cell assembly is an even number, such as 2, 4 or 6, etc. On the first top cover structure 20-1, the positive electrode tabs of half of the cells 31 are connected to one welding area 13, and the positive electrode tabs of the other half of the cells 31 are connected to another welding area 13. On the second top cover structure 20-2, the negative electrode tabs of half of the cells 31 are connected to one welding area 13, and the negative electrode tabs of the other half of the cells 31 are connected to another welding area 13.

[0068] In addition, the present application also provides a battery module, which includes a plurality of batteries 30. The number of batteries 30 can be adaptively selected by those skilled in the art according to the application and capacity of the battery module.

[0069] In addition, the present application also provides an electric device, which includes a battery 30 provided in the present application. The battery can be used as a power source for the electric device, and can also be used as an energy storage unit for the electric device. The electric device may include mobile devices, electric vehicles, electric trains, ships and satellites, energy storage systems, etc., but are not limited to these. Among them, the mobile device may be, for example, a mobile phone, a laptop computer, etc.; the electric vehicle may be, for example, a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc., but are not limited to these.

[0070] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A transfer component, characterized in that: The adapter is provided with a pole connection area, which is used to connect the pole; the adapter forms more than one welding area around the pole connection area, and the welding area is used to weld the pole ear; wherein the welding area extends along the extension direction of the pole connection area, and along the direction perpendicular to the extension direction of the pole connection area, the distance between each position of the welding area and the pole connection area is equal everywhere.

2. The adapter according to claim 1, characterized in that: There are a plurality of welding areas, and along a direction perpendicular to the extending direction of the pole connecting area, the distances between all the welding areas and the pole connecting area are equal.

3. The adapter according to claim 1, characterized in that: There are multiple welding areas, and the multiple welding areas are symmetrically arranged on both sides of the pole connection area.

4. The adapter according to claim 1, characterized in that: The pole connection area is an opening formed in the adapter, so that the pole can be inserted into the opening.

5. The adapter according to claim 1, characterized in that: The pole connection area is in a racetrack shape, and the welding area is a strip area extending along the length direction of the pole connection area.

6. The adapter according to claim 1, characterized in that: The shape of the pole connection area is rectangular, and the welding area is a strip area extending along the extension direction of the pole connection area.

7. The adapter according to claim 1, characterized in that: The shape of the pole connection area is circular or elliptical, and the welding area is an arc-shaped area extending along the extension direction of the pole connection area.

8. The adapter according to claim 1, characterized in that: The pole connection area is located in the central area of ​​the adapter.

9. A top cover structure, characterized in that: The top cover structure comprises: The adapter according to any one of claims 1 to 8; A pole is fixedly connected to a pole connection area of ​​the adapter.

10. A battery, characterized in that: The battery comprises: The two top cover structures described in claim 9 are respectively a first top cover structure and a second top cover structure, the pole of the first top cover structure is a positive pole, and the pole of the second top cover structure is a negative pole; More than one battery cell, the positive electrode tab of the battery cell is welded to the welding area of ​​the adapter in the first top cover structure, and the negative electrode tab of the battery cell is welded to the welding area of ​​the adapter in the second top cover structure.

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