Adapter piece for power battery, battery cell assembly and power battery

Abstract

The utility model relates to an adapter plate for a power battery, a battery cell assembly and the power battery. The adapter piece comprises a first connecting part, a second connecting part and a third connecting part, the first connecting part and the second connecting part are connected to the third connecting part, an avoiding groove is formed between the first connecting part and the second connecting part, and at least one of the first connecting part and the second connecting part is provided with a fool-proof structure so that the fool-proof structure can be inserted into the avoiding groove in the thickness direction of the adapter piece. The projection area is increased, and the projection contours of the first connecting part and the second connecting part are different. The fool-proof structure is arranged on at least one of the first connecting part and the second connecting part, so that the projection area is increased, the projection contours of the first connecting part and the second connecting part are different, namely, the outer contour edges are different, and when the adapter piece is installed to the positioning mechanism, the fool-proof structure can be installed on the adapter piece only when the front face and the back face of the adapter piece are installed correctly. Therefore, accurate fool-proofing of the front and back surfaces can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a switching piece, a battery core assembly and a power battery for a power battery. Background Art

[0002] In the battery industry, the carrier for welding the top cover of the power battery cell assembly to its cell is called an adapter. When welding the top cover to the cell, the front and back of the adapter may be installed in reverse. Symmetry, in the prior art, the periphery of the adapter is generally chamfered to prevent the front and back from being misaligned. However, the chamfering of the adapter will reduce the contact area between the adapter and the tab, thereby affecting the overcurrent of the tab and causing damage to the tab. Utility Model Content

[0003] Based on this, it is necessary to chamfer the periphery of the adapter in the prior art to prevent the front and back sides from being misaligned. However, the chamfering at the position of the adapter will reduce the contact area between the adapter and the pole ear, thereby affecting the overcurrent of the pole ear and causing damage to the pole ear. A technical problem is provided, and an adapter for a power battery is provided.

[0004] A converter for a power battery comprises a first connection portion, a second connection portion and a third connection portion, wherein the first connection portion and the second connection portion are respectively connected to two ends of the third connection portion along a first direction, and a avoidance groove for avoiding a liquid injection port is formed between the first connection portion and the second connection portion, and the third connection portion is used to be connected to a pole, and at least one of the first connection portion and the second connection portion is provided with an anti-foolproof structure to increase the projection area in the thickness direction of the converter and make the projection contours of the first connection portion and the second connection portion different for anti-foolproofing, wherein the first direction is perpendicular to the thickness direction of the converter.

[0005] In one embodiment, the fool-proof structure is provided on the first connection part, and the fool-proof structure provided on the first connection part includes a chamfer provided at the connection between the first connection part and the third connection part; or,

[0006] The fool-proof structure is provided on the second connecting portion, and the fool-proof structure provided on the second connecting portion includes a chamfer provided at the connection between the second connecting portion and the third connecting portion.

[0007] In one embodiment, the fool-proof structure is provided on both the first connection part and the second connection part, and the chamfer at the connection between the first connection part and the third connection part is different in size from the chamfer at the connection between the second connection part and the third connection part.

[0008] In one embodiment, the fool-proof structure is provided on the first connection portion, and the fool-proof structure provided on the first connection portion includes an extension portion provided on the first connection portion along the second direction; or,

[0009] The fool-proof structure is provided on the second connecting portion, and the fool-proof structure provided on the second connecting portion includes an extension portion provided on the second connecting portion along the second direction; wherein the second direction is perpendicular to both the first direction and the thickness direction of the adapter sheet.

[0010] In one embodiment, the fool-proof structure is provided on both the first connecting portion and the second connecting portion;

[0011] The first connection portion is not aligned with a side of the first connection portion close to the avoidance groove in the first direction; and / or the first connection portion is not aligned with a side of the first connection portion far from the avoidance groove in the first direction.

[0012] The utility model also provides a battery core assembly, which can solve at least one of the above technical problems.

[0013] A battery cell assembly includes the above-mentioned adapter sheet and a battery cell, wherein the battery cell includes a winding core and a positive electrode ear and a negative electrode ear connected to the winding core, and the number of the adapter sheets is two, namely a positive electrode adapter sheet for connecting to the positive electrode ear and a negative electrode adapter sheet for connecting to the negative electrode ear.

[0014] In one embodiment, the fool-proof structure is provided on the first connection portion, and the fool-proof structure provided on the first connection portion includes a chamfer provided at the connection between the first connection portion and the third connection portion; the chamfer at the connection between the first connection portion and the third connection portion on the positive electrode adapter is different in size from the chamfer at the connection between the first connection portion and the third connection portion on the negative electrode adapter; and / or,

[0015] The fool-proof structure is provided on the second connecting part, and the fool-proof structure provided on the second connecting part includes a chamfer provided at the connection between the second connecting part and the third connecting part; the chamfer at the connection between the second connecting part and the third connecting part on the positive electrode adapter sheet is different in size from the chamfer at the connection between the second connecting part and the third connecting part on the negative electrode adapter sheet.

[0016] In one embodiment, the fool-proof structure is provided on the first connection part, and the fool-proof structure provided on the first connection part includes a chamfer provided at the connection between the first connection part and the third connection part; and / or, the fool-proof structure is provided on the second connection part, and the fool-proof structure provided on the second connection part includes a chamfer provided at the connection between the second connection part and the third connection part;

[0017] The number of chamfers on the positive electrode adapter plate and the number of chamfers on the negative electrode adapter plate are different.

[0018] In one embodiment, the fool-proof structure is provided on the first connection portion, and the fool-proof structure provided on the first connection portion includes an extension portion provided on the first connection portion along the second direction; and / or, the fool-proof structure is provided on the second connection portion, and the fool-proof structure provided on the second connection portion includes an extension portion provided on the second connection portion along the second direction; wherein the second direction is perpendicular to both the first direction and the thickness direction of the adapter sheet;

[0019] The lengths of the two first connection parts or the two second connection parts in the positive electrode adapter plate and the negative electrode adapter plate in the second direction are different.

[0020] The utility model also provides a power battery, which can solve at least one of the above technical problems.

[0021] A power battery comprises the above-mentioned battery cell assembly and a shell arranged on the periphery of the battery cell assembly.

[0022] Beneficial effects:

[0023] The adapter for a power battery provided by the embodiment of the utility model comprises a first connection part, a second connection part and a third connection part, wherein the first connection part and the second connection part are respectively connected to the two ends of the third connection part along the first direction, and a avoidance groove for avoiding the injection port is formed between the first connection part and the second connection part, and the third connection part is used to connect to the pole, and at least one of the first connection part and the second connection part is provided with a foolproof structure to increase the projection area in the thickness direction of the adapter and make the projection contours of the first connection part and the second connection part different to prevent foolishness, wherein the first direction is perpendicular to the thickness direction of the adapter. The present application provides a foolproof structure on at least one of the first connection part and the second connection part, thereby increasing the projection area in the thickness direction of the adapter and making the projection contours of the first connection part and the second connection part different, so that the outer contour edges of the first connection part and the second connection part on the adapter are different, and when the adapter is installed to the positioning mechanism, the adapter can only cooperate with the positioning mechanism when the front and back sides of the adapter are installed correctly, so that accurate front and back foolproofing can be performed. Among them, in the present application, an anti-fool structure is provided on at least one of the first connecting part and the second connecting part to increase the projected area in the thickness direction of the adapter, thereby not reducing the contact area between the adapter and the pole ear, that is, not affecting the current flow of the pole ear, thereby improving the reliability of the adapter.

[0024] The utility model also provides a battery cell assembly, including the above-mentioned adapter sheet, and also including a battery cell, wherein the battery cell includes a winding core and two positive and negative electrode ear adapter sheets connected to the winding core, namely, a positive electrode adapter sheet for connecting to the positive electrode ear, and a negative electrode adapter sheet for connecting to the negative electrode ear. The battery cell assembly can achieve at least one of the above-mentioned technical effects.

[0025] The utility model also provides a power battery, comprising the above-mentioned battery cell assembly and a shell arranged on the periphery of the battery cell assembly. The power battery can achieve at least one of the above-mentioned technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. 1 is a schematic diagram of an adapter sheet for a power battery provided in one embodiment of the utility model.

[0027] FIG. 2 is a schematic diagram of an adapter sheet for a power battery provided in another embodiment of the present invention.

[0028] FIG3 is a schematic diagram of a positive electrode adapter and a negative electrode adapter in a battery cell assembly provided in an embodiment of the present invention.

[0029] FIG. 4 is a schematic diagram of a positive electrode adapter and a negative electrode adapter in a battery cell assembly provided in another embodiment of the present invention.

[0030] Figure numbers: 110 - first connection part; 120 - second connection part; 130 - third connection part; 140 - avoidance groove; 150 - chamfer; 151 - first chamfer; 152 - second chamfer; 200 - positive electrode adapter; 300 - negative electrode adapter. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model 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 utility model. However, the utility model 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 utility model, so the utility model 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 a limitation on 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 utility model, 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 utility model, 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] Refer to FIG1 , which is a schematic diagram of an adapter for a power battery provided by an embodiment of the present invention. An adapter for a power battery provided by an embodiment of the present invention comprises a first connection portion 110, a second connection portion 120 and a third connection portion 130, wherein the first connection portion 110 and the second connection portion 120 are respectively connected to the two ends of the third connection portion 130 along the first direction, and an avoidance groove 140 for avoiding the injection port is formed between the first connection portion 110 and the second connection portion 120, and the third connection portion 130 is used to connect to the pole, and at least one of the first connection portion 110 and the second connection portion 120 is provided with a foolproof structure to increase the projection area in the thickness direction of the adapter, and make the projection contours of the first connection portion 110 and the second connection portion 120 different for foolproofing, wherein the first direction is perpendicular to the thickness direction of the adapter.

[0038] Specifically, the adapter in the present application is applied to the cell assembly of the power battery. In the process of assembling the cell assembly, the adapter is generally welded to the pole ear first, and then the welded adapter is welded to the pole of the top cover. The present application provides an anti-fool-proof structure on at least one of the first connection part 110 and the second connection part 120, thereby increasing the projected area in the thickness direction of the adapter, and making the projection contours of the first connection part 110 and the second connection part 120 different, so that the outer contour edges of the first connection part 110 and the second connection part 120 of the adapter are different. When the adapter is installed to the positioning mechanism, the adapter can cooperate with the positioning mechanism only when the front and back sides of the adapter are installed correctly, so that accurate front and back anti-fool-proofing can be performed.

[0039] Among them, in the present application, an anti-fool structure is provided on at least one of the first connecting part 110 and the second connecting part 120 to increase the projected area in the thickness direction of the adapter, thereby not reducing the contact area between the adapter and the tab, that is, not affecting the current flow of the tab, thereby improving the reliability of the adapter.

[0040] It should be noted that the first direction is the length direction of the adapter, that is, the up and down direction in Figure 1 of the present application specification, and the second direction is the width direction of the adapter, that is, the left and right direction in Figure 1 of the present application specification. For the convenience of description, the following description will be made in terms of the first direction and the second direction.

[0041] Referring to Figure 1, in one embodiment, a fool-proof structure is provided on the first connection part 110, and the fool-proof structure provided on the first connection part 110 includes a chamfer 150 provided at the connection between the first connection part 110 and the third connection part 130; or, a fool-proof structure is provided on the second connection part 120, and the fool-proof structure provided on the second connection part 120 includes a chamfer 150 provided at the connection between the second connection part 120 and the third connection part 130.

[0042] Specifically, a chamfer 150 is provided at the connection between the first connection part 110 and the third connection part 130, or a chamfer 150 is provided at the connection between the second connection part 120 and the third connection part 130, so that the projection contours of the first connection part 110 and the second connection part 120 in the thickness direction of the adapter sheet are different, thereby making the outer contours of the first connection part 110 and the second connection part 120 different, so as to prevent the front and back sides of the adapter sheet from being fooled.

[0043] Among them, the setting of the chamfer 150 at the connection between the first connection part 110 and the third connection part 130 or the setting of the chamfer 150 at the connection between the second connection part 120 and the third connection part 130 enables the adapter to intuitively determine the first connection part 110 and the second connection part 120 before the adapter is engaged with the positioning mechanism, thereby improving the efficiency of connecting the adapter with the pole ear and the pole, and improving the installation efficiency of the adapter.

[0044] In addition, the chamfer 150 is disposed in the avoidance groove 140, so that during the connection between the adapter and the tab, compared with the method of disposing the chamfer 150 on the periphery of the adapter, the tab will not be scratched, thereby improving the reliability of the adapter. Preferably, the chamfer 150 disposed at the connection between the first connecting portion 110 and the third connecting portion 130 is a rounded corner.

[0045] Referring to FIG. 1 , in one embodiment, fool-proof structures are provided on the first connection portion 110 and the second connection portion 120 , and the chamfer 150 at the connection between the first connection portion 110 and the third connection portion 130 is different in size from the chamfer 150 at the connection between the second connection portion 120 and the third connection portion 130 .

[0046] Specifically, for the sake of easy distinction, the chamfer 150 provided at the connection between the first connection part 110 and the third connection part 130 is defined as the first chamfer 151, and the chamfer 150 provided at the connection between the second connection part 120 and the third connection part 130 is defined as the second chamfer 152. The first chamfer 151 and the second chamfer 152 have different sizes, so that the outer contours of the first connection part 110 and the second connection part 120 are different, so that the front and back sides of the adapter can be fool-proofed.

[0047] Refer to Figure 2, which is a schematic diagram of an adapter for a power battery provided by another embodiment of the utility model. In one embodiment, a foolproof structure is provided on the first connection portion 110, and the foolproof structure provided on the first connection portion 110 includes an extension portion provided on the first connection portion 110 along the second direction; or, a foolproof structure is provided on the second connection portion 120, and the foolproof structure provided on the second connection portion 120 includes an extension portion provided on the second connection portion 120 along the second direction, wherein the second direction is perpendicular to both the first direction and the thickness direction of the adapter.

[0048] Specifically, the first connection part 110 is provided with an extension part on one side along the second direction, or the second connection part 120 is provided with an extension part on one side along the second direction, so that the projection contours of the first connection part 110 or the second connection part 120 in the thickness direction of the adapter plate are different, thereby making the outer contours of the first connection part 110 and the second connection part 120 different, so as to prevent the front and back sides of the adapter plate from being fooled.

[0049] Furthermore, the extension portion provided on the first connection portion 110 is integrally formed with the first connection portion 110 and has the same size in the first direction, thereby avoiding the formation of a bulge between the first connection portion 110 and the extension portion 120, thereby reducing interference with other components. The extension portion provided on the second connection portion 120 is integrally formed with the second connection portion 120 and has the same size in the first direction, thereby avoiding the formation of a bulge between the second connection portion 120 and the extension portion 120, thereby reducing interference with other components.

[0050] In the description, FIG2 is taken as an example, an extension portion is provided on a side of the second connection portion 120 away from the avoidance groove 140, so that in the first direction, the second connection portion 120 is protruded L relative to the first connection portion 110 near the avoidance groove 140. This embodiment is described only by taking FIG2 as an example, but is not limited thereto.

[0051] Referring to FIG. 2 , in one embodiment, foolproof structures are provided on both the first connection portion 110 and the second connection portion 120. The first connection portion 110 and the side of the first connection portion 110 close to the avoidance groove 140 in the first direction are not aligned; and / or the first connection portion 110 and the side of the first connection portion 110 far from the avoidance groove 140 in the first direction are not aligned, so that the outer contours of the first connection portion 110 and the second connection portion 120 are different, so as to prevent the front and back sides of the adapter from being fooled.

[0052] Refer to Figure 3, which is a schematic diagram of the positive electrode adapter and the negative electrode adapter in the battery cell assembly provided by an embodiment of the utility model. The utility model embodiment also provides a battery cell assembly, including the above-mentioned adapter, and also includes a battery cell, the battery cell includes a winding core and a positive electrode ear and a negative electrode ear connected to the winding core, and the number of adapters is two, namely a positive electrode adapter 200 for connecting to the positive electrode ear, and a negative electrode adapter 300 for connecting to the negative electrode ear.

[0053] Specifically, the present application provides an anti-mistake structure on at least one of the first connecting part 110 and the second connecting part 120 in the positive electrode adapter 200 and the negative electrode adapter 300, thereby increasing the projected area in the thickness direction of the adapter and making the projection contours of the first connecting part 110 and the second connecting part 120 different, so that the outer contour edges of the first connecting part 110 and the second connecting part 120 on the adapter are different. When the positive electrode adapter 200 and the negative electrode adapter 300 are installed to the positioning mechanism component, the positive electrode adapter 200 and the negative electrode adapter 300 can cooperate with the corresponding positioning mechanism only when the front and back sides of the positive electrode adapter 200 and the negative electrode adapter 300 are installed correctly, so that accurate front and back side anti-mistake can be performed.

[0054] Referring to FIG. 3 , in one embodiment, the fool-proof structure is provided on the first connection portion 110 , and the fool-proof structure provided on the first connection portion 110 includes a chamfer 150 provided at the connection between the first connection portion 110 and the third connection portion 130 ; the chamfer 150 at the connection between the first connection portion 110 and the third connection portion 130 on the positive electrode adapter 200 is different in size from the chamfer 150 at the connection between the first connection portion 110 and the third connection portion 130 on the negative electrode adapter 300 .

[0055] Specifically, the positive electrode adapter sheet 200 and the negative electrode adapter sheet 300 are both provided with a first chamfer 151, and the sizes of the two first chamfers 151 on the positive electrode adapter sheet 200 and the negative electrode adapter sheet 300 are different, so that the projection contours of the positive electrode adapter sheet 200 and the negative electrode adapter sheet 300 in the thickness direction of the adapter sheet are different, so that the outer contours of the positive electrode adapter sheet 200 and the negative electrode adapter sheet 300 are different, so as to prevent the positive electrode adapter sheet 200 and the negative electrode adapter sheet 300 from being misaligned and installed.

[0056] Referring to FIG. 3 , in one embodiment, a fool-proof structure is provided on the second connection portion 120 , and the fool-proof structure provided on the second connection portion 120 includes a chamfer 150 provided at the connection between the second connection portion 120 and the third connection portion 130 ; the chamfer 150 at the connection between the second connection portion 120 and the third connection portion 130 on the positive electrode adapter 200 is different in size from the chamfer 150 at the connection between the second connection portion 120 and the third connection portion 130 on the negative electrode adapter 300 .

[0057] Specifically, the positive electrode adapter sheet 200 and the negative electrode adapter sheet 300 are both provided with a second chamfer 152, and the sizes of the two second chamfers 152 on the positive electrode adapter sheet 200 and the negative electrode adapter sheet 300 are different, so that the projection contours of the positive electrode adapter sheet 200 and the negative electrode adapter sheet 300 in the thickness direction of the adapter sheet are different, so that the outer contours of the positive electrode adapter sheet 200 and the negative electrode adapter sheet 300 are different, so as to prevent the positive electrode adapter sheet 200 and the negative electrode adapter sheet 300 from being misaligned and installed.

[0058] Referring to FIG. 3 , in one embodiment, the number of chamfers 150 on the positive electrode adapter 200 and the number of chamfers 150 on the negative electrode adapter 300 are different. For example, the positive electrode adapter 200 is provided with a first chamfer 151 and a second chamfer 152, and the negative electrode adapter 300 is only provided with the first chamfer 151, so that the projection contours of the positive electrode adapter 200 and the negative electrode adapter 300 in the thickness direction of the adapter are different, so that the outer contours of the positive electrode adapter 200 and the negative electrode adapter 300 are different, so as to prevent the positive electrode adapter 200 and the negative electrode adapter 300 from being misaligned and installed.

[0059] Refer to FIG. 4, which is a schematic diagram of a positive electrode adapter and a negative electrode adapter in a battery cell assembly provided by another embodiment of the utility model. In one embodiment, a foolproof structure is provided on the first connection portion 110, and the foolproof structure provided on the first connection portion 110 includes an extension portion provided on the first connection portion 110 along the second direction; and / or, a foolproof structure is provided on the second connection portion 120, and the foolproof structure provided on the second connection portion 120 includes an extension portion provided on the second connection portion 120 along the second direction. The lengths of the two first connection portions 110 or the two second connection portions 120 in the positive electrode adapter 200 and the negative electrode adapter 300 in the second direction are different, so that the outer contours of the positive electrode adapter 200 and the negative electrode adapter 300 are different, so as to foolproof the positive electrode adapter 200 and the negative electrode adapter 300 and prevent the positive electrode adapter 200 and the negative electrode adapter 300 from being misplaced during installation.

[0060] 1 , 2 , 3 and 4 , an embodiment of the utility model further provides a power battery, comprising the above-mentioned battery cell assembly and a shell arranged on the periphery of the battery cell assembly.

[0061] Specifically, by providing an anti-mistake structure on at least one of the first connecting portion 110 and the second connecting portion 120, the projected area is increased in the thickness direction of the adapter, and the outer contours of the first connecting portion 110 and the second connecting portion 120 are different, and the outer contours of the positive electrode adapter 200 and the negative electrode adapter 300 are different, so that the positive electrode adapter 200 and the negative electrode adapter 300 can be accurately anti-mistaken on the front and back sides, and the positive electrode adapter 200 and the negative electrode adapter 300 can be anti-mistaken when they are installed in a misaligned manner, thereby improving the reliability of the power battery.

[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0063] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An adapter for a power battery, characterized in that: The adapter sheet for a power battery includes a first connection portion, a second connection portion and a third connection portion, wherein the first connection portion and the second connection portion are respectively connected to two ends of the third connection portion along a first direction, and a avoidance groove for avoiding a liquid injection port is formed between the first connection portion and the second connection portion, and the third connection portion is used to be connected to a pole, and an anti-foolproof structure is provided on at least one of the first connection portion and the second connection portion to increase a projection area in a thickness direction of the adapter sheet and to make the projection contours of the first connection portion and the second connection portion different for anti-foolproofing, wherein the first direction is perpendicular to the thickness direction of the adapter sheet.

2. The adapter for a power battery according to claim 1, characterized in that: The fool-proof structure is provided on the first connecting part, and the fool-proof structure provided on the first connecting part includes a chamfer provided at the connection between the first connecting part and the third connecting part; or, The fool-proof structure is provided on the second connecting portion, and the fool-proof structure provided on the second connecting portion includes a chamfer provided at the connection between the second connecting portion and the third connecting portion.

3. The adapter for a power battery according to claim 2, characterized in that: The fool-proof structure is provided on both the first connection part and the second connection part, and the chamfer at the connection between the first connection part and the third connection part is different in size from the chamfer at the connection between the second connection part and the third connection part.

4. The adapter for a power battery according to any one of claims 1 to 3, characterized in that: The fool-proof structure is provided on the first connecting portion, and the fool-proof structure provided on the first connecting portion includes an extension portion provided on the first connecting portion along the second direction; or, The fool-proof structure is provided on the second connecting portion, and the fool-proof structure provided on the second connecting portion includes an extension portion provided on the second connecting portion along the second direction; wherein the second direction is perpendicular to both the first direction and the thickness direction of the adapter sheet.

5. The adapter for a power battery according to claim 4, characterized in that: The fool-proof structure is provided on both the first connecting portion and the second connecting portion; The first connection portion is not aligned with a side of the first connection portion close to the avoidance groove in the first direction; and / or the first connection portion is not aligned with a side of the first connection portion far from the avoidance groove in the first direction.

6. A battery cell assembly, characterized in that: It includes the adapter sheet as described in any one of claims 1 to 5, and also includes a battery cell, the battery cell includes a winding core and a positive electrode ear and a negative electrode ear connected to the winding core, the number of the adapter sheets is two, namely a positive electrode adapter sheet for connecting to the positive electrode ear, and a negative electrode adapter sheet for connecting to the negative electrode ear.

7. The battery cell assembly according to claim 6, characterized in that: The fool-proof structure is provided on the first connection part, and the fool-proof structure provided on the first connection part includes a chamfer provided at the connection between the first connection part and the third connection part; the chamfer at the connection between the first connection part and the third connection part on the positive electrode adapter is different in size from the chamfer at the connection between the first connection part and the third connection part on the negative electrode adapter; and / or, The fool-proof structure is provided on the second connecting part, and the fool-proof structure provided on the second connecting part includes a chamfer provided at the connection between the second connecting part and the third connecting part; the chamfer at the connection between the second connecting part and the third connecting part on the positive electrode adapter sheet is different in size from the chamfer at the connection between the second connecting part and the third connecting part on the negative electrode adapter sheet.

8. The battery cell assembly according to claim 6, characterized in that: The fool-proof structure is provided on the first connection part, and the fool-proof structure provided on the first connection part includes a chamfer provided at the connection between the first connection part and the third connection part; and / or, the fool-proof structure is provided on the second connection part, and the fool-proof structure provided on the second connection part includes a chamfer provided at the connection between the second connection part and the third connection part; The number of chamfers on the positive electrode adapter plate and the number of chamfers on the negative electrode adapter plate are different.

9. The battery core assembly according to any one of claims 6 to 8, characterized in that: The fool-proof structure is provided on the first connection part, and the fool-proof structure provided on the first connection part includes an extension part provided on the first connection part along the second direction; and / or, the fool-proof structure is provided on the second connection part, and the fool-proof structure provided on the second connection part includes an extension part provided on the second connection part along the second direction; wherein the second direction is perpendicular to both the first direction and the thickness direction of the adapter sheet; The lengths of the two first connection parts or the two second connection parts in the positive electrode adapter plate and the negative electrode adapter plate in the second direction are different.

10. A power battery, characterized in that: It comprises the battery cell assembly according to any one of claims 6 to 9 and a shell arranged on the periphery of the battery cell assembly.

Images