Connecting piece and connecting structure

Abstract

The utility model provides a connecting piece which is used for being connected with an electrode terminal and a tab. The connecting piece has a thickness direction and comprises a plurality of single pieces, and the single pieces are stacked in the thickness direction. According to the connecting piece provided by the utility model, the structure formed by stacking the plurality of single pieces is adopted, and each single piece is relatively thin and has better ductility, so that the connecting piece is not easy to break when being bent, and the bending operation is facilitated. The utility model further provides a connecting structure.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a connecting sheet and a connecting structure. Background Art

[0002] The battery generally includes a shell, a bare cell and electrolyte disposed in the shell, and a cover plate for sealing the shell. Among them, the bare cell is provided with a tab, and the cover plate is provided with an electrode terminal. The tab of the bare cell needs to be electrically connected to the electrode terminal on the cover plate (its specific structure can be referred to patent CN214013029U, etc.).

[0003] Generally, the tabs of the bare cell are connected to the electrode terminals on the cover plate through connecting pieces. In order to improve the current carrying capacity, the thicker the connecting piece, the better. However, if the connecting piece is too thick, it will affect its bending (the connecting piece generally needs to be bent, and if the connecting piece is too thick, it will easily break during the bending process). Utility Model Content

[0004] The utility model aims to provide a connecting piece, aiming to solve the problem that the connecting piece is too thick and thus affects its bending.

[0005] An embodiment of the utility model provides a connecting piece for connecting with an electrode terminal and a pole ear; the connecting piece has a thickness direction, and the connecting piece includes a plurality of single pieces, and the plurality of single pieces are stacked along the thickness direction.

[0006] In one achievable manner, the connecting sheet includes a first region portion and a second region portion, the first region portion is used to connect to the electrode terminal; along the thickness direction, the thickness of the first region portion is D1, the thickness of the second region portion is D2, and D1<D2.

[0007] In one achievable manner, D1 and D2 satisfy: 1 / 10≤D1 / D2<1.

[0008] In an achievable manner, the connecting sheet further has a first direction and a second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other;

[0009] The first region portion and the second region portion are sequentially arranged along the first direction; or the second region portion includes a portion arranged along the first direction with the first region portion, and the second region portion further includes a portion arranged along the second direction with the first region portion.

[0010] In one achievable manner, the first region portion includes a first welding portion for welding connection to the electrode terminal, and the second region portion includes a second welding portion for welding connection to the electrode tab.

[0011] In one feasible manner, the connecting piece further has a first direction and a second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other; the first welding portion and the second welding portion are arranged along the first direction, and the cross-sectional area of ​​the first welding portion perpendicular to the thickness direction is S1, and the cross-sectional area of ​​the second welding portion perpendicular to the first direction is S2, and S2≤S1.

[0012] In one achievable manner, part of the single sheets is provided with a notch, and the notch and the first region are arranged along the thickness direction.

[0013] In an achievable manner, a notch is provided on one of the single sheets; along the thickness direction, the single sheet provided with the notch is located at the outermost side of all the single sheets;

[0014] Alternatively, a plurality of the single sheets are provided with notches, and the plurality of the single sheets provided with notches are stacked in sequence along the thickness direction; along the thickness direction, one of the single sheets provided with a notch is located at the outermost side of all the single sheets.

[0015] In one achievable manner, the single piece with the notch is located on a side of the single piece without the notch away from the electrode terminal, and the single piece without the notch is used for welding connection with the electrode terminal.

[0016] In one achievable manner, along the thickness direction, the notch penetrates the single piece where it is located; the second area portion includes a pre-welding portion for welding and connecting the single pieces, and the pre-welding portion is arranged close to the first welding portion.

[0017] In an achievable manner, the connecting sheet further has a first direction and a second direction, the first direction, the second direction and the thickness direction are perpendicular to each other, and the first welding portion and the second welding portion are arranged along the first direction;

[0018] The pre-welding portion includes a first pre-welding portion, and the first pre-welding portion is arranged on at least one side of the first welding portion along the second direction, and / or the pre-welding portion includes a second pre-welding portion, and the second pre-welding portion is located between the first welding portion and the second welding portion along the first direction.

[0019] In one feasible manner, the cross-sectional area of ​​the second welding portion perpendicular to the first direction is S2; the number of the first pre-welding portions is one or more, and the sum of the cross-sectional areas of the first pre-welding portions perpendicular to the thickness direction is S3, S2≤S3.

[0020] In one achievable manner, along the first direction, end portions at opposite ends of the first pre-weld portion respectively exceed end portions at opposite ends of the first weld portion.

[0021] In one achievable manner, the first direction is the length direction of the connecting piece, and the second direction is the width direction of the connecting piece.

[0022] Another embodiment of the utility model further provides a connection structure, comprising a bare battery cell and the above-mentioned connection sheet, wherein the connection sheet is connected to a pole ear of at least one of the bare battery cells.

[0023] The connecting sheet provided by the utility model is arranged as a structure of stacking multiple single sheets. Since each single sheet is relatively thin and has good ductility, it is not easy to break when bending, thereby facilitating the bending operation and avoiding the problem of bending being affected by the thick thickness of the connecting sheet. On the other hand, during welding, the tabs and / or electrode terminals can be selectively welded with part of the single sheets in the connecting sheet, avoiding the problem of welding with the tabs and / or electrode terminals being affected by the thick thickness of the connecting sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a top view of the connecting piece in the embodiment of the utility model.

[0025] Figure 2 for Figure 1 Schematic diagram of the cross section along position AA.

[0026] Figure 3 for Figure 1 Schematic diagram of the cross section along the BB position.

[0027] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure in the bent state.

[0028] Figure 5 It is a top view of a connecting piece in another embodiment of the utility model.

[0029] Figure 6 for Figure 5 Schematic diagram of the cross section along the GG position.

[0030] Figure 7 It is a side view of the unbent adapter connected to the bare battery cell in the embodiment of the utility model.

[0031] Figure 8 It is a side view of another embodiment of the utility model in which an unbent adapter is connected to a bare battery cell.

[0032] Figures 9a to 9f It is a schematic diagram of the assembly process of the adapter and the bare battery cell in the embodiment of the utility model.

[0033] Figures 10a to 10e It is a schematic diagram of the assembly process of the adapter and the bare battery cell in another embodiment of the utility model.

[0034] Fig.11 It is a schematic diagram of the three-dimensional structure of the battery cell in the embodiment of the utility model.

[0035] Fig.12 for Fig.11 Schematic diagram of the explosion structure.

[0036] In the figure: 1-connecting piece, 11-first regional portion, 111-first welding portion, 12-second regional portion, 121-second welding portion, 1211-ear welding portion, 122-pre-welding portion, 1221-first pre-welding portion, 1222-second pre-welding portion, 2-single-chip group, 21-single chip, 211-notch, 3-bare cell, 31-ear, 32-insulating layer, 4-shell, 41-opening, 5-cover plate, 51-electrode terminal, 6-heat conducting member, 61-clamping portion, 62-contact portion, 7-insulating sheet, 8-insulating film. DETAILED DESCRIPTION

[0037] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0039] The directional words such as up, down, left, right, front, back, top, bottom, etc. (if any) involved in the specification and claims of the utility model are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional words should not limit the scope of protection claimed by the utility model.

[0040] like Figure 1 and Figure 2 As shown, the connecting piece 1 provided in the embodiment of the utility model is used to connect with the electrode terminal 51 and the pole ear 31 (the specific structure of the electrode terminal 51 and the pole ear 31 is shown in Figure 7 and Fig.12 ), the connecting sheet 1 has a thickness direction D, and the connecting sheet 1 includes a plurality of single sheets 21, and the plurality of single sheets 21 are stacked along the thickness direction D.

[0041] Specifically, in this embodiment, the connecting sheet 1 is configured as a structure in which a plurality of single sheets 21 are stacked. Since each single sheet 21 is relatively thin, when it is bent (wherein, Figure 1 The connecting piece 1 in the figure is in the state before being bent. Figure 4 The connecting piece 1 in the figure is in a bent state; when the connecting piece 1 is bent, the connecting piece 1 is bent along its thickness direction D), and the connecting piece 1 is not easy to break, so it is convenient for bending operation, and the problem of bending being affected by the thick thickness of the connecting piece 1 can be avoided. On the other hand, during welding, the tab 31 and / or the electrode terminal 51 can be selectively welded with part of the single piece 21 in the connecting piece 1, so as to facilitate the welding operation, which is conducive to solving the problem of welding between the connecting piece 1 and the tab 31 and / or the electrode terminal 51 being affected by the thick thickness of the connecting piece 1.

[0042] like Figure 1 and Figure 2 As shown, as an embodiment, the connecting sheet 1 includes a first region 11 and a second region 12, and the first region 11 is used to connect with the electrode terminal 51 (the specific structure of the electrode terminal 51 is shown in FIG. Fig.12 ), the second region 12 is the portion of the connecting sheet 1 other than the first region 11. Along the thickness direction D of the connecting sheet 1, the thickness of the first region 11 is D1, the thickness of the second region 12 is D2, and D1<D2.

[0043] As an implementation manner, D1 and D2 satisfy: 1 / 10≤D1 / D2<1.

[0044] As an implementation manner, D1 and D2 satisfy: 1 / 5≤D1 / D2≤4 / 5.

[0045] As an implementation manner, D1 and D2 satisfy: 1 / 4≤D1 / D2≤3 / 4.

[0046] As an implementation manner, D1 and D2 satisfy: 1 / 3≤D1 / D2≤2 / 3.

[0047] like Figure 1 and Figure 2 As shown in FIG. 1 , as an embodiment, the cross-sectional area of ​​the first region 11 perpendicular to the thickness direction D (eg Figure 1 As shown, that is, the cross-sectional area of ​​the first region 11 parallel to the paper surface) is S M , the cross-sectional area of ​​the second region 12 perpendicular to the thickness direction D (eg Figure 1 As shown, that is, the cross-sectional area of ​​the second region 12 parallel to the paper surface) is S N , S M ≤S N .

[0048] like Figure 1 and Figure 2 As shown, as an implementation mode, the S M and the SN Satisfaction: S M <S N .

[0049] Specifically, the connection sheet 1 provided in this embodiment is provided with a first region 11 of the connection sheet 1 for welding to the electrode terminal 51, which is thinner, so as to facilitate the welding connection between the connection sheet 1 and the electrode terminal 51, thereby solving the problem that the connection sheet 1 is too thick and affects the welding between the connection sheet 1 and the electrode terminal 51. At the same time, since the cross-sectional area S of the first region 11 is M The cross-sectional area S of the second region 12 is not more than N , thereby avoiding affecting the flow capacity of the connecting sheet 1 (since the thickness D1 of the first region 11 is relatively thin, the flow capacity of the first region 11 is relatively weak; if the cross-sectional area S of the first region 11 is M If the cross-sectional area S of the second region 12 is too large, it will affect the overall current capacity of the connecting piece 1), and at the same time facilitate the welding of the connecting piece 1 and the tab 31 (the second region 12 needs to be welded to the tab 31; if the cross-sectional area S of the second region 12 is N If it is too small, it will be inconvenient to weld the tab 31).

[0050] As an embodiment, the connecting piece 1 is a rectangular sheet structure as a whole, and the connecting piece 1 also has a first direction L and a second direction W. The first direction L, the second direction W and the thickness direction D are perpendicular to each other. The first direction L is the length direction of the connecting piece 1, and the second direction W is the width direction of the connecting piece 1.

[0051] like Figure 5 and Figure 6 As shown, as an embodiment, the first area portion 11 and the second area portion 12 can be arranged in sequence along the first direction L, that is, the first area portion 11 is located at one end of the connecting piece 1 along the first direction L, and along the second direction W, the ends of the second area portion 12 at both ends are respectively flush with the ends of the first area portion 11 at both ends.

[0052] As another embodiment, the second area portion 12 is at least partially arranged around the periphery of the first area portion 11, the second area portion 12 includes a portion arranged along the first direction L with the first area portion 11, and the second area portion 12 also includes a portion arranged along the second direction W with the first area portion 11 (that is, part of the second area portion 12 is located on at least one side of the first area portion 11 along the first direction L, and another part of the second area portion 12 is located on at least one side of the first area portion 11 along the second direction W). Specifically, as Figure 1 , Figure 2 and Figure 4As shown, the second region 12 may be disposed around the periphery of the first region 11 (ie, both sides of the first region 11 along the first direction L and both sides of the first region 11 along the second direction W are connected to the second region 12 ).

[0053] like Figure 1 As shown, as an embodiment, the first region 11 includes a first welding portion 111 for welding to the electrode terminal 51, and the second region 12 includes a second welding portion 121 for welding to the tab 31 (for the specific structure of the electrode terminal 51 and the tab 31, see Figure 7 and Fig.12 ).

[0054] like Figure 1 and Figure 3 As shown, as an embodiment, the first welding portion 111 and the second welding portion 121 are arranged along the first direction L, and the cross-sectional area of ​​the first welding portion 111 perpendicular to the thickness direction D (such as Figure 1 As shown, that is, the cross-sectional area of ​​the first welding portion 111 parallel to the paper surface) is S1, and the cross-sectional area of ​​the second welding portion 121 perpendicular to the first direction L (as shown Figure 3 ) is S2, S2≤S1. Thus, it is avoided that the cross-sectional area S1 of the first welding portion 111 perpendicular to the thickness direction D is too small to affect the flow performance of the connecting sheet 1 between the first welding portion 111 and the second welding portion 121.

[0055] like Figure 1 and Figure 4 As shown, as an embodiment, the second welding portion 121 includes at least one pole ear welding portion 1211, and the second welding portion 121 is welded to the pole ear 31 through the pole ear welding portion 1211 (the specific structure of the pole ear 31 is shown in Figure 7 ).

[0056] like Figure 1 and Figure 4 As shown, as an embodiment, the second welding portion 121 includes two tab welding portions 1211 , and the two tab welding portions 1211 are arranged along the second direction W.

[0057] As an embodiment, the first area portion 11 can be formed by mechanical cutting (for example, milling the connecting piece 1 with a milling machine), mechanical thinning (for example, extruding and thinning the connecting piece 1 mechanically), chemical etching (for example, locally etching the connecting piece 1 with chemical solutions), etc.

[0058] like Figure 2 and Figure 4As shown, as an embodiment, a notch 211 is provided at a position corresponding to the first regional portion 11 on some single pieces 21 (not all single pieces 21 are provided with the notch 211); the notch 211 and the first regional portion 11 are arranged along the thickness direction D, thereby, a first regional portion 11 with a relatively thin thickness can be formed on the connecting piece 1.

[0059] like Figure 2 and Figure 4 As shown, as an embodiment, along the thickness direction D, the notch 211 penetrates the single piece 21 where it is located, and multiple single pieces 21 are provided with notches 211. Multiple single pieces 21 provided with notches 211 are stacked in sequence along the thickness direction D, so that the notches 211 on multiple single pieces 21 are arranged side by side and interconnected in the thickness direction D. Along the thickness direction D, one of the single pieces 21 provided with a notch 211 is located at the outermost side of all the single pieces 21, so that a slot structure is formed on the surface of one side of the connecting piece 1. As another embodiment, a single piece 21 is provided with a notch 211; along the thickness direction D, the notch 211 is located at the outermost side of the connecting piece 1. This arrangement can also form a slot structure on the surface of one side of the connecting piece 1.

[0060] like Figure 2 , Figure 4 and Fig.12 As shown, as an embodiment, the single piece 21 with the notch 211 is located on the side of the single piece 21 without the notch 211 away from the electrode terminal 51. During welding, the electrode terminal 51 is welded after contacting the surface of the first area portion 11 away from the notch 211, thereby facilitating the contact welding between the connecting piece 1 and the electrode terminal 51.

[0061] like Figure 1 and Figure 4 As shown, as an embodiment, in the single piece 21 with the notch 211 in the thickness direction D, the notch 211 penetrates the single piece 21 where it is located; the single pieces 21 in the connecting piece 1 are connected by welding, and the second area portion 12 includes a pre-welding portion 122 for welding and connecting the single pieces 21, and the pre-welding portion 122 is arranged close to the first welding portion 111. In this embodiment, due to the setting of the notch 211, the current at the first welding portion 111 of the single piece 21 with fewer layers flows to the single piece 21 with more layers in the second area portion 12 through the pre-welding portion 122, and the pre-welding portion 122 is arranged close to the first welding portion 111, thereby making the current transmission path in the single piece 21 with more layers account for a higher proportion in the total overcurrent path (that is, the current can be transmitted on multiple single pieces 21 at the same time), thereby improving the overcurrent performance of the connecting piece 1.

[0062] like Figure 1As shown, as an embodiment, the first welding portion 111 and the second welding portion 121 are arranged along the first direction L, and the pre-welding portion 122 includes a first pre-welding portion 1221; along the second direction W, the first pre-welding portion 1221 is provided on at least one side of the first welding portion 111. The first direction L is the length direction of the connecting piece 1, and the second direction W is the width direction of the connecting piece 1; since the second welding portion 121 and the first welding portion 111 are arranged along the first direction L, the width of the connecting piece 1 is usually smaller than the length and is easily limited. In this embodiment, the first pre-welding portion 1221 and the first welding portion 111 can be extended along the first direction L, so that the length of the first welding portion 111 and the first pre-welding portion 1221 in the first direction L is longer, and then the relative cross-sectional area of ​​the first welding portion 111 and the first pre-welding portion 1221 is larger, thereby improving the flow capacity between the first welding portion 111 and the first pre-welding portion 1221.

[0063] like Figure 1 As shown, as an embodiment, the first welding portion 111 and the second welding portion 121 are arranged along the first direction L, and the pre-welding portion 122 includes a second pre-welding portion 1222, and along the first direction L, the second pre-welding portion 1222 is located between the first welding portion 111 and the second welding portion 121. As an embodiment, the second pre-welding portion 1222 is extended along the second direction W.

[0064] like Figure 1 and Figure 3 As shown, as an embodiment, the cross-sectional area of ​​the second welding portion 121 perpendicular to the first direction L is S2; the number of the first pre-welding portions 1221 is one or more, and the cross-sectional area of ​​each first pre-welding portion 1221 perpendicular to the thickness direction D (such as Figure 1 As shown, that is, the sum of the cross-sectional areas of the second welding portion 121 parallel to the paper surface is S3, S2≤S3.

[0065] As an implementation manner, the cross-sectional area of ​​the second welding portion 121 perpendicular to the first direction L is smaller than the cross-sectional area of ​​each first pre-welding portion 1221 perpendicular to the thickness direction D.

[0066] like Figure 1 As shown in the figure, as an embodiment, along the first direction L, the ends of the first pre-welding portion 1221 at the opposite ends respectively exceed the ends of the first welding portion 111 at the opposite ends (from Figure 1 From the perspective of FIG. 1 , that is, the left and right ends of the first pre-weld portion 1221 respectively exceed the left and right ends of the first weld portion 111 ), thereby further improving the current flow capacity between the first weld portion 111 and the first pre-weld portion 1221 .

[0067] like Figure 1As shown, as an embodiment, along the second direction W, the ends of the second pre-weld portion 1222 at both ends exceed the ends of the first weld portion 111 at both ends, thereby further improving the flow capacity between the first weld portion 111 and the second pre-weld portion 1222.

[0068] like Figure 1 As shown, as an implementation mode, along the second direction W, first pre-welding portions 1221 are provided on opposite sides of the first welding portion 111 .

[0069] As an implementation mode, the above-mentioned electrode tab 31 is a positive electrode tab or a negative electrode tab, and the above-mentioned electrode terminal 51 is a corresponding positive electrode terminal or a negative electrode terminal.

[0070] like Figure 7 As shown, an embodiment of the utility model further provides a connection structure, including at least one bare battery cell 3 and the above-mentioned connecting sheet 1, the connecting sheet 1 is connected to the pole ear 31 of at least one bare battery cell 3, and the pole ear 31 is a positive pole ear or a negative pole ear.

[0071] like Figure 7 As shown, as an embodiment, the connecting sheet 1 is connected to the tabs 31 of at least two bare cells 3 , and the tabs 31 of at least two bare cells 3 are connected to the surfaces of different sheets 21 in the connecting sheet 1 .

[0072] like Figure 8 As shown, as another embodiment, the connecting sheet 1 is connected to the tabs 31 of at least two bare cells 3, and the tabs 31 of each bare cell 3 are connected to the surface of the same single sheet 21 in the connecting sheet 1. This embodiment can facilitate welding operations and improve production efficiency.

[0073] like Figure 2 , Figure 7 and Figures 9a to 9f As shown, as an embodiment, the multiple single pieces 21 in the connecting sheet 1 are divided into multiple single piece groups 2 along the thickness direction D, and each single piece group 2 includes at least one single piece 21; the multiple single piece groups 2 are respectively welded to the tabs 31 of different bare cells 3. As a result, the tabs 31 can be welded to fewer single pieces 21, avoiding the influence of the welding of the tabs 31 on the thickness of the connecting sheet 1.

[0074] like Figure 2 As shown, as an embodiment, each single-piece group 2 includes a plurality of single pieces 21 , and the plurality of single pieces 21 in each single-piece group 2 are stacked in sequence along the thickness direction D. As another embodiment, each single-piece group 2 includes one single piece 21 .

[0075] like Figure 2 As shown, as an implementation manner, the number of single chips 21 in each single chip group 2 is the same.

[0076] like Figure 7 and Figures 9a to 9f As shown, as an embodiment, the number of bare cells 3 is two, and the tabs 31 on each bare cell 3 include a positive tab and a negative tab. The positive tabs of the two bare cells 3 are welded to the same connecting piece 1, and the multiple single pieces 21 in the connecting piece 1 are divided into two single piece groups 2, and the positive tabs of the two bare cells 3 are respectively welded to the two single piece groups 2; at this time, the positive tabs of the two bare cells 3 are connected to the surfaces of different single pieces 21 in the connecting piece 1. The negative tabs of the two bare cells 3 are both welded to another connecting piece 1, and the multiple single pieces 21 in the other connecting piece 1 are divided into two single piece groups 2, and the negative tabs of the two bare cells 3 are respectively welded to the two single piece groups 2 in the other connecting piece 1; at this time, the negative tabs of the two bare cells 3 are connected to the surfaces of different single pieces 21 in the other connecting piece 1.

[0077] like Figures 9a to 9f As shown, as an embodiment, taking any one of the positive and negative ears of the bare battery cell 3 as an example (in this embodiment, the ear 31 described later refers to the positive ear or the negative ear), the connection method between the ear 31 on the bare battery cell 3 and the corresponding connecting sheet 1 is (it should be noted that, Fig.9c for Figure 9b Side view of Fig.9e for Figure 9d Side view of the

[0078] (1) Figures 9a to 9c As shown, the connecting sheet 1 is divided into two single-piece groups 2, and the two single-piece groups 2 are respectively welded to the pole ears 31 of the two bare cells 3, and then the two bare cells 3 are combined and brought together along the thickness direction. At this time, the two single-piece groups 2 and the pole ears 31 of the two bare cells 3 are parallel to the bare cells 3 (i.e. Figure 9b and Fig.9c In the figure, the two bare cells 3, the two monolithic groups 2 and the tabs 31 of the two bare cells 3 are all in a standing state);

[0079] (2) Figure 9c to Figure 9f As shown, the tabs 31 of the two monolithic groups 2 and the two bare cells 3 are bent inward (i.e., bent in a direction close to each other); after bending, the two monolithic groups 2 are stacked up and down, and then the two monolithic groups 2 stacked up and down are welded to form a connecting sheet 1, that is, as shown in FIG. Figure 9d to Figure 9f At this time, the tabs 31 of the two bare cells 3 are connected to the surfaces of different sheets 21 in the connecting sheet 1 .

[0080] like Figure 8 and Figures 10a to 10eAs shown, as another embodiment, the number of bare cells 3 is two, and the tabs 31 on each bare cell 3 include a positive tab and a negative tab, and the positive tabs of the two bare cells 3 are welded to a connecting sheet 1, and the positive tabs of the two bare cells 3 are connected to the surface of the same single sheet 21 in the connecting sheet 1. The negative tabs of the two bare cells 3 are welded to another connecting sheet 1, and the negative tabs of the two bare cells 3 are connected to the surface of the same single sheet 21 in the other connecting sheet 1.

[0081] like Figures 10a to 10e As shown, as an embodiment, taking any one of the positive and negative ears of the bare battery cell 3 as an example (in this embodiment, the ear 31 described later refers to the positive ear or the negative ear), the connection method between the ear 31 on the bare battery cell 3 and the connecting sheet 1 is (it should be noted that, Fig.10b for Fig.10a Side view of Fig.10e for Fig.10d Side view of the

[0082] (1) Fig.10a and Fig.10b As shown, the two bare cells 3 are placed in a flat state, and the tabs 31 of the two bare cells 3 are arranged close to each other; the tabs 31 of the two bare cells 3 are welded to the surface of the same side of the connecting sheet 1;

[0083] (2) Fig.10b and Fig.10c As shown, the two bare cells 3 are bent upward at the same time, so that the tabs 31 on the two bare cells 3 are bent upward; after bending, the two bare cells 3 are combined and brought together to obtain the following Fig.10d and Fig.10e At this time, the tabs 31 of the two bare cells 3 are connected to the surface of the same single piece 21 in the connecting piece 1.

[0084] like Fig.11 and Fig.12 As shown, this embodiment also provides a square shell battery cell, including the above-mentioned connection structure.

[0085] like Fig.11 and Fig.12 As shown, as an embodiment, the square shell battery cell further includes a square shell 4 and a cover plate 5, and the bare battery cell 3 and the connecting sheet 1 are arranged in the shell 4. Along the length direction of the shell 4, at least one end of the shell 4 is provided with an opening 41, and the cover plate 5 is arranged at the opening 41 and seals the opening 41.

[0086] like Fig.11 and Fig.12As shown, as an embodiment, the cover plate 5 is provided with an electrode terminal 51, and the tab 31 of the bare cell 3 is electrically connected to the electrode terminal 51 through the connecting piece 1. Specifically, one end of the connecting piece 1 is welded to the tab 31, and the other end of the connecting piece 1 is bent and welded to the electrode terminal 51 (the connecting piece 1 is bent into an L-shaped structure, for example).

[0087] Specifically, in the present embodiment, openings 41 are provided at opposite ends of the shell 4 along the length direction, and cover plates 5 are provided at the openings 41 at opposite ends, and electrode terminals 51 are provided on the cover plates 5 at opposite ends, wherein the electrode terminal 51 on one cover plate 5 is a positive electrode terminal, and the electrode terminal 51 on the other cover plate 5 is a negative electrode terminal. The tabs 31 on the bare cell 3 include positive tabs and negative tabs, and the positive tabs of the bare cell 3 are electrically connected to the positive electrode terminal through a connecting piece 1, and the negative tabs of the bare cell 3 are electrically connected to the negative electrode terminal through another connecting piece 1. Of course, in other embodiments, the positive electrode terminal and the negative electrode terminal may be provided on one cover plate 5 at the same time, and the positive tabs of the bare cell 3 are electrically connected to the positive electrode terminal through a connecting piece 1, and the negative tabs of the bare cell 3 are electrically connected to the negative electrode terminal through another connecting piece 1.

[0088] As another embodiment, when the shell 4 serves as the positive electrode or negative electrode of the square shell battery cell, the shell 4 is electrically connected to the corresponding positive electrode ear or negative electrode ear of the bare battery cell 3 (the shell 4 and the corresponding positive electrode ear or negative electrode ear can be directly contacted and electrically connected, or can be electrically connected through the connecting piece 1), and the positive electrode ear and negative electrode ear of the bare battery cell 3 that are not electrically connected to the shell 4 are electrically connected to the electrode terminal 51 through the connecting piece 1.

[0089] like Fig.12 As shown, as an embodiment, a plurality of bare cells 3 are provided in the shell 4, and the plurality of bare cells 3 are arranged along the thickness direction thereof. Among the plurality of bare cells 3, at least some of the positive pole ears of the bare cells 3 are connected to the same connecting piece 1, and / or, at least some of the negative pole ears of the bare cells 3 are connected to another same connecting piece 1 (in this embodiment, the positive pole ears of all the bare cells 3 are connected to the same connecting piece 1, and the negative pole ears of all the bare cells 3 are connected to another same connecting piece 1. In this embodiment, two bare cells 3 are shown, but there may be more in reality). As another embodiment, among the plurality of bare cells 3, the positive pole ears of each bare cell 3 are connected to the plurality of connecting pieces 1 one by one, and / or, the negative pole ears of each bare cell 3 are connected to another plurality of connecting pieces 1 one by one.

[0090] like Fig.12 As shown, as an implementation mode, the outer surface of the bare battery cell 3 is wrapped with an insulating layer 32, and the insulating layer 32 can be a PET blue film or a Mylar film.

[0091] like Fig.12 As shown, as an embodiment, the square shell battery cell further includes a heat conductive member 6, which is located in the shell 4. The heat conductive member 6 includes a clamping portion 61 and a contact portion 62 connected to each other, the clamping portion 61 is clamped between adjacent bare battery cells 3, and the contact portion 62 is in contact with the inner wall of the shell 4. Thus, the heat conductive member 6 can transfer the heat between adjacent bare battery cells 3 to the shell 4 for heat dissipation.

[0092] As an implementation manner, the heat conducting member 6 is made of a material with good thermal conductivity (such as metal).

[0093] like Fig.12 As shown, as an embodiment, an insulating sheet 7 is provided between the inner wall of the shell 4 and the bare battery cell 3 , the insulating sheet 7 is located on the output ear side of the bare battery cell 3 , and the insulating sheet 7 is located between the connecting sheet 1 and the inner wall of the shell 4 .

[0094] like Fig.12 As shown, as an implementation mode, the outer wall of the shell 4 is also wrapped with an insulating film 8, and the insulating film 8 is, for example, a PET film.

[0095] The connecting sheet 1 provided by the embodiment of the utility model is configured as a structure in which a plurality of single sheets 21 are stacked. Since each single sheet 21 is relatively thin, the connecting sheet 1 is not easily broken when being bent, thereby facilitating the bending operation and avoiding the problem of bending being affected by the thick thickness of the connecting sheet 1. On the other hand, during welding, the tab 31 and / or the electrode terminal 51 can be selectively welded with a portion of the single sheets 21 in the connecting sheet 1, thereby facilitating the welding operation and helping to solve the problem of welding the connecting sheet 1 with the tab 31 and / or the electrode terminal 51 being affected by the thick thickness of the connecting sheet 1.

[0096] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A connecting piece, used to connect with an electrode terminal (51) and a tab (31), characterized in that: The connecting sheet (1) has a thickness direction (D), and the connecting sheet (1) comprises a plurality of single sheets (21), wherein the plurality of single sheets (21) are stacked along the thickness direction (D).

2. The connecting piece according to claim 1, characterized in that: The connecting piece (1) comprises a first area portion (11) and a second area portion (12), wherein the first area portion (11) is used to connect to the electrode terminal (51); along the thickness direction (D), the thickness of the first area portion (11) is D1, and the thickness of the second area portion (12) is D2, wherein D1<D2.

3. The connecting piece according to claim 2, characterized in that: The D1 and the D2 satisfy: 1 / 10≤D1 / D2<1.

4. The connecting sheet according to claim 2, characterized in that: The connecting sheet (1) further has a first direction (L) and a second direction (W), and the first direction (L), the second direction (W) and the thickness direction (D) are perpendicular to each other; Along the first direction (L), the first regional portion (11) and the second regional portion (12) are arranged in sequence; or, the second regional portion (12) includes a portion arranged along the first direction (L) with the first regional portion (11), and also includes a portion arranged along the second direction (W) with the first regional portion (11).

5. The connecting piece according to claim 2, characterized in that: The first region portion (11) includes a first welding portion (111) for welding connection with the electrode terminal (51), and the second region portion (12) includes a second welding portion (121) for welding connection with the electrode tab (31).

6. The connecting piece according to claim 5, characterized in that: The connecting piece (1) further has a first direction (L) and a second direction (W), the first direction (L), the second direction (W) and the thickness direction (D) being perpendicular to each other; the first welding portion (111) and the second welding portion (121) are arranged along the first direction (L), the cross-sectional area of ​​the first welding portion (111) perpendicular to the thickness direction (D) is S1, and the cross-sectional area of ​​the second welding portion (121) perpendicular to the first direction (L) is S2, and S2≤S1.

7. The connecting sheet according to claim 5, characterized in that: Part of the single piece (21) is provided with a notch (211), and the notch (211) and the first region (11) are arranged along the thickness direction (D).

8. The connecting piece according to claim 7, characterized in that: Along the thickness direction (D), the notch (211) penetrates the single piece (21) where it is located; the second area portion (12) includes a pre-welding portion (122) for welding and connecting the single pieces (21), and the pre-welding portion (122) is arranged close to the first welding portion (111).

9. The connecting sheet according to claim 8, characterized in that: The connecting sheet (1) further has a first direction (L) and a second direction (W), the first direction (L), the second direction (W) and the thickness direction (D) are perpendicular to each other, and the first welding portion (111) and the second welding portion (121) are arranged along the first direction (L); The pre-welding portion (122) includes a first pre-welding portion (1221), and along the second direction (W), the first pre-welding portion (1221) is provided on at least one side of the first welding portion (111), and / or the pre-welding portion (122) includes a second pre-welding portion (1222), and along the first direction (L), the second pre-welding portion (1222) is located between the first welding portion (111) and the second welding portion (121).

10. The connecting sheet according to claim 9, characterized in that: The cross-sectional area of ​​the second welding portion (121) perpendicular to the first direction (L) is S2; the number of the first pre-welding portions (1221) is one or more, and the sum of the cross-sectional areas of the first pre-welding portions (1221) perpendicular to the thickness direction (D) is S3, S2≤S3.

11. The connecting sheet according to claim 9, characterized in that: Along the first direction (L), the ends of the first pre-welding portion (1221) at two opposite ends respectively exceed the ends of the first welding portion (111) at two opposite ends.

12. A connection structure, characterized in that: It comprises a bare battery cell (3) and a connecting piece as claimed in any one of claims 1 to 11, wherein the connecting piece (1) is connected to a pole ear (31) of at least one of the bare battery cells (3).

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