Connecting piece and battery monomer

Abstract

The utility model relates to a connecting piece and a battery monomer. The deformation part is connected between the pole connecting part and the pole lug connecting part; the pole connecting part is provided with a first surface and a second surface which are opposite in orientation, the first surface is used for being in contact with a pole, the tab connecting part is used for extending into a tab through hole formed by a tab, and the third surface of the tab connecting part is in contact with the inner circumferential wall of the tab through hole; the tab connecting part is provided with a first folding position and a second folding position relative to the pole connecting part, and the second folding position is that a first interval space is formed between the third surface and the second surface in a face-to-face manner. The pole connecting part is provided with a central datum line, the deformation part is provided with a turnover datum line, the central datum line is parallel to the turnover datum line, and the tab connecting part is turned over relative to the pole connecting part along the turnover datum line. The connecting piece can be applied to the battery cell with the tab through hole formed in the tab, and the welding difficulty of the tab and the connecting piece is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a connecting piece and a battery cell. Background Art

[0002] With the development of battery technology, in order to solve the problem of temperature rise of battery cells under high-rate working conditions, a battery core with a tab through-hole formed in the tab has emerged. The tab of this battery core has a larger cross-sectional area (i.e., the current-carrying cross-sectional area of the tab), thereby being able to solve the problem of temperature rise of battery cells under high-rate working conditions.

[0003] In related technologies, since the material for making the tab is softer than the material for making the connecting piece, compared with applying a welding gun to the connecting piece (i.e., applying the welding gun to the connecting piece to weld the connecting piece to the tab), if a welding gun is applied to the tab to weld the tab to the connecting piece, the welding quality of the tab and the connecting piece is easier to control.

[0004] However, when the connecting piece is applied to this battery core with a tab through-hole formed in the tab, when the tab is welded to the connecting piece, the welding gun cannot directly act on the tab to weld the tab to the connecting piece. If the tab and the connecting piece are to be welded into one body, it is necessary to apply a welding gun to the connecting piece to weld the connecting piece to the tab. However, applying a welding gun to the connecting piece to achieve the purpose of fixedly connecting the connecting piece and the tab has the problem that the welding quality of the connecting piece and the tab is difficult to control, resulting in a high rejection rate. Summary of the Utility Model

[0005] Based on this, in view of the problem of poor welding quality between the connecting piece and a battery core, it is necessary to provide a connecting piece.

[0006] A connecting piece includes: a pole connection part, a tab connection part, and a deformation part. The deformation part is connected between the pole connection part and the tab connection part, and the tab connection part is used to fold relative to the pole connection part through the deformation part;

[0007] The pole connection part has a first surface and a second surface facing in opposite directions. The first surface is used to contact the pole, the tab connection part is used to extend into the tab through-hole formed by the tab, and the third surface of the tab connection part contacts the inner peripheral wall of the tab through-hole;

[0008] The tab connection part has a first folding position and a second folding position relative to the pole connection part. The second folding position is where the third surface and the second surface face each other, and there is a first spacing space between the third surface and the second surface;

[0009] The pole connection part has a central reference line, and the deformation part has a folding reference line. The central reference line is parallel to the folding reference line. The tab connection part folds relative to the pole connection part along the folding reference line, so that the tab connection part moves from the first folding position to the second folding position.

[0010] In one embodiment, the tab connection part has a connected plugging unit part and a connecting unit part. The connecting unit part is connected to the pole connection part through the deformation part. There is a second spacing space between the plugging unit part and the pole connection part. At least a part of the plugging unit part is used to extend into the tab through hole formed by the tab.

[0011] In one embodiment, the deformation part includes at least one connecting piece, and the connecting piece is connected between the pole connection part and the tab connection part.

[0012] In one embodiment, the deformation part includes a plurality of connecting pieces, and adjacent two connecting pieces are arranged in sequence in the thickness direction of the connecting piece.

[0013] In one embodiment, a welding area is formed on the second surface, and a plurality of groove structures are formed in the welding area.

[0014] In one embodiment, the pole connection part is formed with an avoidance structure, and along the assembly direction of the pole connection part and the cover plate, the avoidance structure is adapted to be correspondingly arranged with the liquid injection hole of the cover plate.

[0015] In one embodiment, the connecting piece further includes: an insulating part, and the insulating part is arranged on the second surface and is used to prevent the pole connection part from contacting the tab.

[0016] In one embodiment, the tab connection part is located on one side of the central reference line; or,

[0017] The number of tab connection parts is configured to be multiple, and each tab connection part is connected to the pole connection part through at least one deformation part. The multiple tab connection parts are respectively located on both sides of the central reference line.

[0018] In one embodiment, the number of tab connection parts is configured to be two. The two tab connection parts include a first tab connection part and a second tab connection part. When the first tab connection part and the second tab connection part are both in the second folding position, there is a third spacing space between the first tab connection part and the second tab connection part.

[0019] The connecting piece according to the present application can be applied to an electric core in which a tab forms a tab through hole. And during the process of welding the tab to the connecting piece, the welding equipment can act on the tab so that the tab is welded to the tab connection part of the connecting piece, thereby reducing the welding difficulty and also ensuring the welding quality to reduce the rejection rate.

[0020] The present application further provides a battery cell, which includes:

[0021] A housing, within which an assembly space is formed;

[0022] A battery core, which is assembled within the assembly space;

[0023] A cover plate, which is used to seal the opening of the assembly space;

[0024] And the connecting member in some of the above embodiments; wherein the pole connection part contacts the pole of the cover plate, and the tab connection part extends into the tab through-hole of the battery core and contacts the inner peripheral wall of the tab through-hole. Description of the Drawings

[0025] Figure 1 A perspective view of the connecting member according to an embodiment of the present application, in which the tab connection part is located at the first folding position.

[0026] Figure 2 A perspective view of the connecting member according to an embodiment of the present application, in which the tab connection part is located at the second folding position.

[0027] Figure 3 A side view of the connecting member according to an embodiment of the present application, in which the tab connection part is located at the second folding position.

[0028] Figure 4 A top view of the connecting member according to another embodiment of the present application, in which the tab connection part is located at the first folding position.

[0029] Figure 5 A top view of the connecting member according to another embodiment of the present application, in which the tab connection part is located at the second folding position.

[0030] Figure 6 A schematic diagram of the cooperation between the connecting member, the cover plate and the battery core according to some embodiments of the present application, in which the tab connection part is located at the first folding position.

[0031] Figure 7 A schematic diagram of the cooperation between the connecting member, the cover plate and the battery core according to some embodiments of the present application, in which the tab connection part is located at the second folding position.

[0032] Figure 8 For Figure 7 The enlarged view at A in

[0033] Reference Numerals in the Drawings:

[0034] 1. Pole connection part; 11. First surface; 12. Second surface; 1200. Welding area; 120a. Groove structure; 13. Avoidance structure;

[0035] 2. Tab connection part; 20. Third surface; 21. First tab connection part; 22. Second tab connection part;

[0036] 3. Deformation part; 31. First deformation part; 32. Second deformation part;

[0037] 100. Battery cell; 110. Tab; 120. Tab through hole;

[0038] 200. Cover plate; 210. Terminal; 220. Liquid injection hole;

[0039] L1. Central reference line; L2. Folding reference line. Detailed implementation mode

[0040] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation mode of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0041] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0042] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In this application, unless otherwise clearly specified or limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In this application, unless otherwise clearly specified or limited, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be 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, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0046] Refer to Figure 1 and Figure 2 and Figure 7 As shown in

[0047] Refer to Figure 1 and Figure 2 As shown, the connector includes a pole connection part 1, an ear connection part 2 and a deformation part 3. The deformation part 3 is connected between the pole connection part 1 and the ear connection part 2, and the ear connection part 2 is used to fold relative to the pole connection part 1 through the deformation part 3.

[0048] Refer to Figure 3As shown, the terminal connection part 1 has a first surface 11 and a second surface 12 facing in opposite directions. The first surface 11 is used to contact the terminal 210 to achieve the effect of the connection member being in contact connection with the terminal 210. The tab connection part 2 is used to extend into the tab through-hole 120 formed by the tab 110. The third surface 20 of the tab connection part 2 contacts the inner peripheral wall of the tab through-hole 120 to achieve the effect of the connection member being in contact connection with the tab 110, thereby achieving the effect of the connection member being connected between the terminal 210 and the tab 110.

[0049] Combined with Figure 1 and Figure 2 as shown, and combined with Figure 4 and Figure 5 as shown, the tab connection part 2 has a first folding position and a second folding position relative to the terminal connection part 1. When the tab connection part 2 is in the first folding position, it is convenient for the operator to extend the tab connection part 2 into the tab through-hole 120.

[0050] During the process of the tab connection part 2 moving from the first folding position to the second folding position, the deformation part 3 deforms. Also referring to Figure 2 and Figure 3 as shown, when the tab connection part 2 is in the second folding position, the third surface 20 and the second surface 12 face each other in the thickness direction of the terminal connection part 1, and there is a first spaced-apart space between the third surface 20 and the second surface 12.

[0051] The terminal connection part 1 has a central reference line L1, and the deformation part 3 has a folding reference line L2. The central reference line L1 is parallel to the folding reference line L2. The tab connection part 2 folds relative to the terminal connection part 1 along the folding reference line L2, so that the tab connection part 2 moves from the first folding position to the second folding position.

[0052] Exemplarily, combined with Figures 1 to 8 as shown, during the process of the operator connecting the connection member between the terminal 210 and the tab 110. The operator places the connection member with the tab connection part 2 in the first folding position inside the cover plate 200, and makes the first surface 11 contact the terminal 210. Then the operator uses a welding device to act on the second surface 12 to weld and fix the terminal connection part 1 to the terminal 210. Specifically, in the assembly direction of the terminal connection part 1 and the cover plate 200 (i.e., the Z direction shown in the figure), the orthographic projection of the area where the welding device acts on the second surface 12 coincides with the orthographic projection of the area where the first surface 11 and the terminal 210 contact, so as to achieve the effect of the fixed connection between the first surface 11 and the terminal 210 when the welding device acts on the second surface 12.

[0053] After the pole connection part 1 is welded and fixed to the pole 210, the operator connects the battery cell 100 and the ear connection part 2. Specifically, the operator inserts the ear connection part 2 into the ear through-hole 120 of the ear 110, so that the third surface 20 of the ear connection part 2 contacts the inner peripheral wall of the ear through-hole 120.

[0054] Then, the operator uses welding equipment to act on the ear 110, so that the ear 110 is welded to the ear connection part 2. Specifically, in the direction perpendicular to the third surface 20, the orthographic projection of the area where the welding equipment acts on the ear 110 coincides with the orthographic projection of the area where the third surface 20 and the ear 110 contact, so as to achieve the effect of fixedly connecting the ear 110 and the third surface 20 when the welding equipment acts on the ear 110.

[0055] It should be added that during the process of welding the ear 110 to the ear connection part 2 by the welding equipment, in the welding direction (i.e., the direction perpendicular to the third surface 20), the ear 110 is located between the welding equipment and the ear connection part 2. When the force generated by the welding equipment acts on the ear 110, the ear connection part 2 can generate a reaction force for supporting the ear 110, so that the welding quality of the ear 110 and the ear connection part 2 can be further improved.

[0056] After the ear 110 is welded to the ear connection part 2, the operator folds the ear connection part 2 relative to the pole connection part 1 along the folding reference line L2, so that the ear connection part 2 moves from the first folding position to the second folding position, so that the third surface 20 and the second surface 12 face each other, and there is a first spacer space between the third surface 20 and the second surface 12, and the first spacer space can be used to accommodate part of the structure of the ear 110.

[0057] Combined with Figure 7 As shown, when the ear connection part 2 moves to the second folding position, the thickness direction of the cover plate 200 is parallel to the length direction of the battery cell 100, so that the operator can assemble the battery cell 100 into the housing of the battery monomer, and the cover plate 200 can be covered on the housing.

[0058] It should be added that in some embodiments, the pole connection part 1 is a plate-like structure. Referring to Figures 1 to 3 As shown, the central reference line L1 can be the center line perpendicular to the width direction of the pole connection part 1. In the width direction of the pole connection part 1, the ear connection part 2 is located on one side of the pole connection part 1. Or, referring to Figure 4 As shown, the central reference line L1 can be the center line perpendicular to the length direction of the pole connection part 1. In the length direction of the pole connection part 1, the ear connection part 2 is located on one side of the pole connection part 1.

[0059] In summary, the connector according to the present application can be applied to a battery cell 100 in which a tab 110 is formed with a tab through-hole 120. During the process of welding the tab 110 to the connector, the welding equipment can act on the tab 110 to weld the tab 110 to the tab connection portion 2 of the connector, thereby reducing the welding difficulty and ensuring the welding quality to reduce the rejection rate.

[0060] In addition, referring to Figure 7 and Figure 8 As shown, compared with the existing combination of the connector, the cover plate, and the battery cell, for the connector according to the present application, since the tab connection portion 2 extends into the tab through-hole 120 formed by the tab 110, when the tab connection portion 2 is in the second folding position, the distance H between the inner surface of the cover plate 200 and the main body of the battery cell 100 is effectively reduced.

[0061] For a cover plate 200 with a fixed size and a battery cell 100 with a fixed size, using the connecting piece proposed in the present application to connect between the cover plate 200 and the battery cell 100 can reduce the overall size of the assembly composed of the cover plate 200, the connecting piece, and the battery cell 100, and further reduce the overall size of the battery module. For a housing with a fixed size, a battery cell 100 with a larger size can also be arranged in the housing. Thus, the battery module using the connecting piece proposed in the present application can achieve the effect of improving the energy density of the battery module.

[0062] It should be added that, referring to Figure 1 As shown, in some embodiments, when the tab connection portion 2 is in the first folding position, taking the included angle between the tab connection portion 2 and the pole connection portion 1 in the YZ plane being 90° as an example for illustration. However, the present application is not limited thereto. When the tab connection portion 2 is in the first folding position, the included angle between the tab connection portion 2 and the pole connection portion 1 in the YZ plane is not limited, as long as it is convenient for the operator to match the tab connection portion 2 with the tab 110 when the tab connection portion 2 is in the first folding position.

[0063] In addition, referring to Figure 4 As shown, in some embodiments, when the tab connection portion 2 is in the first folding position, taking the included angle between the tab connection portion 2 and the pole connection portion 1 in the XZ plane being 180° as an example for illustration. However, the present application is not limited thereto. When the tab connection portion 2 is in the first folding position, the included angle between the tab connection portion 2 and the pole connection portion 1 in the XZ plane is not limited, as long as it is convenient for the operator to match the tab connection portion 2 with the tab 110 when the tab connection portion 2 is in the first folding position.

[0064] In some embodiments, the tab connecting portion 2 may have a connected plugging unit portion and a connecting unit portion. The connecting unit portion is connected to the pole connecting portion 1 through a deformation portion 3. There is a second spaced-apart space between the plugging unit portion and the pole connecting portion 1, so as to prevent the plugging unit portion from contacting the pole connecting portion 1, such that at least a part of the plugging unit portion is used to extend into the tab through-hole 120 formed by the tab 110.

[0065] Exemplarily, referring to Figure 1 as shown, when the tab connecting portion 2 is in the first folding position, in the Y direction, there is a second spaced-apart space between the plugging unit portion and the pole connecting portion 1. When the plugging unit portion extends into the tab through-hole 120, a part of the structure of the tab 110 can be located in the second spaced-apart space, so as to ensure that at least a part of the plugging unit portion can extend into the tab through-hole 120. Additionally, referring to Figure 2 and 3 as shown, when the tab connecting portion 2 is in the first folding position, the second spaced-apart space can be a part of the first spaced-apart space.

[0066] Referring to Figures 1 to 3 as shown, in some embodiments, the deformation portion 3 includes at least one connecting piece. It can also be understood that the deformation portion 3 is composed of one connecting piece or multiple connecting pieces. The connecting piece is connected between the pole connecting portion 1 and the tab connecting portion 2, thereby achieving the effect that the deformation portion 3 is connected between the pole connecting portion 1 and the tab connecting portion 2.

[0067] In some embodiments, the deformation portion 3 includes multiple connecting pieces. The multiple connecting pieces are all connected between the tab connecting portion 2 and the pole connecting portion 1 to achieve the effect that the deformation portion 3 is connected between the pole connecting portion 1 and the tab connecting portion 2. And in the thickness direction of the connecting piece, the multiple connecting pieces are arranged in sequence along the thickness direction of the connecting piece.

[0068] The number of connecting pieces in the deformation portion 3 is configured to be multiple. In the thickness direction of one of the connecting pieces, adjacent two connecting pieces are arranged in sequence, so that the deformation portion 3 has a larger cross-sectional area, ensuring the electrical conductivity of the deformation portion 3.

[0069] In the thickness direction of one of the multiple connecting pieces, there may be a gap between adjacent two connecting pieces, or adjacent two connecting pieces are stacked. In some embodiments of the present application, taking the example that there is a gap between adjacent two connecting pieces, since there is a gap between adjacent two connecting pieces, during the deformation process of the deformation portion 3, interference between adjacent two connecting pieces can be avoided, such that the tab connecting portion 2 can move from the first folding position to the second folding position, and at the same time, the cross-sectional area of the deformation portion 3 can be ensured, ensuring the electrical conductivity of the deformation portion 3.

[0070] Referring to Figure 1 、 Figure 2 、Figure 4 and Figure 5 As shown in Figure 5 , in some embodiments, the second surface 12 is formed with a welding area 1200. In the assembly direction of the pole connection part 1 and the cover plate 200 (i.e., the Z direction shown in the figure), the orthographic projection of the welding area 1200 coincides with the orthographic projection of the area where the first surface 11 contacts the pole 210.

[0071] During the process that an operator uses a welding device to weld the pole connection part 1 to the pole 210, the operator applies the welding device to the welding area 1200, so that the area of the first surface 11 opposite to the welding area 1200 is fixedly connected to the pole 210.

[0072] Refer to Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown in Figure 4 , in some embodiments, a plurality of groove structures 120a are further formed in the welding area 1200, so as to increase the roughness of the welding area 1200, thereby reducing the reflectivity, avoiding the situation of false soldering or poor soldering caused by reflection, and improving the soldering yield.

[0073] Refer to Figure 1 and Figure 2 As shown in Figure 1 , in some embodiments, the number of the tab connection parts 2 in the connector can be configured as one or more. When the number of the tab connection parts 2 is configured as one, the tab connection part 2 is located on one side of the central reference line L1. When the number of the tab connection parts 2 is configured as multiple, each tab connection part 2 is connected through at least one deformation part 3, and the multiple tab connection parts 2 are respectively located on both sides of the central reference line L1.

[0074] Refer to Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown in Figure 4 , in some embodiments, the number of the tab connection parts 2 is configured as two, the two tab connection parts 2 include a first tab connection part 21 and a second tab connection part 22, and the number of the deformation parts 3 is configured as two, the two deformation parts 3 include a first deformation part 31 and a second deformation part 32. So that the connector can be applied to connect two battery cells 100 to one cover plate 200.

[0075] Refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 8 As shown in Figure 5 , when the first tab connection part 21 and the second tab connection part 22 are both in the second folding position, there is a third spacing space between the first tab connection part 21 and the second tab connection part 22.

[0076] When the first tab connecting portion 21 and the second tab connecting portion 22 are respectively connected to the two battery cells 100, and both the first tab connecting portion 21 and the second tab connecting portion 22 are located at the second folding position, the third spacing space can accommodate a partial structure of the tabs 110 of the two battery cells 100, thereby avoiding interference between the two tabs 110.

[0077] Refer to Figures 1 to 6 As shown, in some embodiments, the pole connection portion 1 is formed with an avoidance structure 13. When the connecting member is fixedly connected to the pole 210, in the assembling direction of the pole connection portion 1 and the cover plate 200 (i.e., the Z direction shown in the figure), the avoidance structure 13 is correspondingly arranged with the liquid injection hole 220 of the cover plate 200. When the liquid injection gun extends into the housing through the liquid injection hole 220, interference between the pole connection portion 1 and the liquid injection gun is avoided, so that the depth of the liquid injection gun extending into the housing can be ensured, and electrolyte overflow can be avoided during the liquid injection process.

[0078] In some embodiments, the avoidance structure 13 can be a hole-like structure or a notch structure. Refer to Figures 1 to 6 As shown, in the present application, the avoidance structure 13 is taken as an example of a notch structure. In addition, it should be noted that providing the avoidance structure 13 can also reduce the mass of the pole connection portion 1, thereby achieving the purpose of lightweight design of the connecting member.

[0079] In some embodiments, the connecting member may further include an insulating member. The insulating member can be an insulating film or an insulating coating. The insulating member is arranged on the second surface 12 to play an insulating role between the pole connection portion 1 and the tab 110 of the battery cell 100 when the tab connecting portion 2 is located at the second folding position, thereby avoiding direct electrical connection between the tab 110 and the pole connection portion 1.

[0080] Refer to Figure 6 and Figure 7 As shown, the present application also provides a battery single body, which includes a housing (not shown in the figure), a battery cell 100, a cover plate 200, and a connecting member. Among them, the connecting member is the connecting member mentioned in the above-mentioned some embodiments. The pole connection portion 1 of the connecting member is connected and contacted with the pole 210 of the cover plate 200, and the tab connecting portion 2 extends into the tab through hole 120 of the battery cell 100 and is connected and contacted with the inner peripheral wall of the tab through hole 120, so that the cover plate 200, the connecting member, and the battery cell 100 are combined to form an assembly. An assembly space is formed in the housing. When the assembly formed by the cover plate 200, the connecting member, and the battery cell 100 is assembled with the housing, the connecting member and the battery cell 100 are located in the assembly space, and the cover plate 200 is used to seal the opening of the assembly space.

[0081] Refer to Figure 7 and Figure 8As shown, since the tab connection part 2 extends into the tab through-hole 120 formed by the tab 110, when the tab connection part 2 is in the second folding position, the distance H between the inner surface of the cover plate 200 and the main body of the battery cell 100 can be effectively reduced.

[0082] For the cover plate 200 with a fixed size and the battery cell 100 with a fixed size, by using the connecting piece proposed in the present application to connect between the cover plate 200 and the battery cell 100, the overall size of the assembly composed of the cover plate 200, the connecting piece and the battery cell 100 can be reduced, and further the overall size of the battery module can be reduced. For a housing with a fixed size, a battery cell 100 with a larger size can also be arranged in the housing. Thus, the battery module adopting the connecting piece proposed in the present application can achieve the effect of improving the energy density of the battery module.

[0083] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0084] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A connecting piece, characterized in that, Comprising: A terminal connection part (1), an ear connection part (2), and a deformation part (3). The deformation part (3) is connected between the terminal connection part (1) and the ear connection part (2). The ear connection part (2) is configured to flip relative to the terminal connection part (1) through the deformation part (3). The terminal connection part (1) has a first surface (11) and a second surface (12) facing opposite directions. The first surface (11) is used to contact a terminal (210). The ear connection part (2) is configured to extend into an ear through-hole (120) formed by an ear (110). A third surface (20) of the ear connection part (2) contacts the inner peripheral wall of the ear through-hole (120). The ear connection part (2) has a first flipping position and a second flipping position relative to the terminal connection part (1). In the second flipping position, the third surface (20) and the second surface (12) face each other, and there is a first spacing space between the third surface (20) and the second surface (12). The terminal connection part (1) has a central reference line (L1), and the deformation part (3) has a flipping reference line (L2). The central reference line (L1) is parallel to the flipping reference line (L2). The ear connection part (2) flips relative to the terminal connection part (1) along the flipping reference line (L2) such that the ear connection part (2) moves from the first flipping position to the second flipping position.

2. The connecting member according to claim 1, characterized in that, The ear connection part (2) has a connected plugging unit part and a connection unit part. The connection unit part is connected to the terminal connection part (1) through the deformation part (3). There is a second spacing space between the plugging unit part and the terminal connection part (1). At least a part of the plugging unit part is configured to extend into the ear through-hole (120) formed by the ear (110).

3. The connecting member according to claim 1, wherein The deformation part (3) includes at least one connecting piece, and the connecting piece is connected between the terminal connection part (1) and the ear connection part (2).

4. The connecting member according to claim 3, wherein The deformation part (3) includes a plurality of the connecting pieces, and the adjacent two connecting pieces are arranged in sequence in the thickness direction of the connecting piece.

5. The connecting member according to claim 1, wherein The second surface (12) is formed with a welding area (1200), and a plurality of groove structures (120a) are formed in the welding area (1200).

6. The connecting member according to claim 1, wherein, The terminal connection part (1) is formed with an avoidance structure (13). Along the assembly direction of the terminal connection part (1) and a cover plate (200), the avoidance structure (13) is adapted to be correspondingly arranged with a liquid injection hole (220) of the cover plate (200).

7. The connecting member according to claim 1, wherein, Also comprising: An insulating member. The insulating member is arranged on the second surface (12), and the insulating member is used to prevent the terminal connection part (1) from contacting the ear (110).

8. The connecting member according to any one of claims 1 to 6, characterized in that, The ear connection part (2) is located on one side of the central reference line (L1); or, The number of the tab connection parts (2) is configured to be multiple, and each of the tab connection parts (2) is connected to the terminal connection part (1) through at least one of the deformation parts (3). The multiple tab connection parts (2) are respectively located on both sides of the central reference line (L1).

9. The connecting member according to claim 8, characterized in that, The number of the tab connection parts (2) is configured to be two. The two tab connection parts (2) include a first tab connection part (21) and a second tab connection part (22). When the first tab connection part (21) and the second tab connection part (22) are both located at the second folding position, there is a third spaced space between the first tab connection part (21) and the second tab connection part (22).

10. A battery cell, characterized in that, Comprising: A housing in which an assembly space is formed; A battery cell (100) assembled in the assembly space; A cover plate (200) for covering the opening of the assembly space; And a connecting member according to any one of claims 1 to 9; Wherein the terminal connection part (1) contacts the terminal (210) of the cover plate (200), and the tab connection part (2) extends into the tab through hole (120) of the battery cell (100) and contacts the inner peripheral wall of the tab through hole (120).

Images