Connecting piece and battery

Abstract

The utility model provides a connecting piece and a battery, the connecting piece comprises a pole connecting plate and a tab connecting plate, and one side plate surface of the pole connecting plate is convexly provided with a connecting bulge used for being connected with a pole; the tab connecting plate forming an included angle with the pole connecting plate is arranged on the other side plate surface of the pole connecting plate; the pole connecting plate protrudes out of two opposite side plate surfaces of the tab connecting plate, and at least one side plate surface of the pole connecting plate is used for being connected with a tab. According to the connecting piece provided by the embodiment of the invention, the tab connecting plate forming the included angle with the pole connecting plate is arranged on the other side of the pole connecting plate, and the pole connecting plate protrudes out of the two opposite side plate surfaces of the tab connecting plate, so that when the tab of the battery cell is connected with at least one side plate surface of the pole connecting plate, the tab does not need to be bent, and the battery cell can be conveniently connected. Therefore, the side surface of the tab can be opposite to the plate surface of the tab connecting plate, so that the tab can be connected with the tab connecting plate, and the technical problem that the tab is easy to break due to the fact that the tab needs to be bent in the connecting process of the tab and the connecting sheet can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a connecting sheet and a battery. BACKGROUND

[0002] In the related art, the battery cell is usually arranged in the shell, and the tab of the battery cell is connected with the pole column arranged on the top cover of the shell through the connecting sheet. In the process of connecting the tab with the connecting sheet, the tab usually needs to be bent. Due to the insufficient toughness of the tab, the tab is prone to breakage in the bending process. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a connecting sheet and a battery, which can improve the technical problem that the tab is prone to breakage in the process of connecting the tab with the connecting sheet.

[0004] In a first aspect, embodiments of the present application provide a connecting sheet, comprising:

[0005] The pole connecting plate has a connecting protrusion protruding from one side of the plate surface, and the connecting protrusion is used to connect with the pole column;

[0006] The tab connecting plate is arranged on the other side of the plate surface of the pole connecting plate, and the tab connecting plate is arranged at an angle with the pole connecting plate;

[0007] The pole connecting plate protrudes from the opposite two sides of the plate surface of the tab connecting plate, and at least one side of the plate surface of the pole connecting plate is used to connect with the tab.

[0008] In an embodiment, the thickness of the pole connecting plate and / or the tab connecting plate is greater than or equal to 0.05 mm.

[0009] In an embodiment, in the thickness direction of the pole connecting plate, the width of the tab connecting sheet is less than or equal to 100 mm.

[0010] In an embodiment, the pole connecting plate and the tab connecting plate are an integral structure; or the pole connecting plate and the tab connecting plate are welded.

[0011] In an embodiment, the pole connecting plate and the tab connecting plate are substantially perpendicular.

[0012] In an embodiment, the tab connecting plate is a rectangular plate, and one side edge of the tab connecting plate is connected with the plate surface of the pole connecting plate away from the side of the connecting protrusion;

[0013] The pole connecting plate is a rectangular plate, and in the thickness direction of the tab connecting plate, the distance from the two side edges of the pole connecting plate to the tab connecting plate is substantially equal.

[0014] In an embodiment, the length of the pole connecting plate is substantially the same as the length of the tab connecting plate in a direction perpendicular to the thickness direction of the pole connecting plate and the thickness direction of the tab connecting plate.

[0015] In an embodiment, the distance from the two side edges of the pole connecting plate to the connecting protrusion is substantially the same in the thickness direction of the tab connecting plate; and / or,

[0016] The distance from the two side edges of the pole connecting plate to the connecting protrusion is substantially the same in a direction perpendicular to the thickness direction of the pole connecting plate and the thickness direction of the tab connecting plate.

[0017] In a second aspect, embodiments of the present application provide a battery, comprising:

[0018] The cell assembly comprises at least one cell, and one side of the cell is provided with a tab.

[0019] The connecting sheet is as described above, and the connecting sheet comprises a pole connecting plate and a tab connecting plate. One side of the pole connecting plate is provided with a connecting protrusion, and the connecting protrusion is used for connecting with a pole. The tab connecting plate is arranged on the other side of the pole connecting plate, and the tab connecting plate is arranged at an angle with the pole connecting plate. The pole connecting plate protrudes from the opposite two side surfaces of the tab connecting plate, and at least one side of the pole connecting plate is used for connecting with a tab.

[0020] One side of the pole connecting plate provided with the tab connecting plate is arranged opposite to one side of the cell provided with the tab, and the tab is connected with the surface of the tab connecting plate.

[0021] In an embodiment, one side of the cell is provided with a plurality of tabs with the same polarity, and the plurality of tabs with the same polarity are distributed on the two sides in the thickness direction of the tab connecting plate.

[0022] In an embodiment, the cell comprises two cell packs distributed in the thickness direction of the tab connecting plate, and each of the cell packs is connected with the tab on one side of the connecting sheet. The tabs connected with the two cell packs are distributed on the two sides in the thickness direction of the tab connecting plate.

[0023] In an embodiment, the length of the tab connecting sheet is greater than or equal to the width of the corresponding tab in a direction perpendicular to the thickness direction of the tab connecting plate and the thickness direction of the pole connecting plate, and the difference between the length of the tab connecting sheet and the width of the corresponding tab is less than or equal to 100 mm; and / or,

[0024] a ratio of a length of the connecting piece to a length of the battery cell in a direction perpendicular to the thickness direction of the tab connecting plate and the pole connecting plate is less than or equal to 0.5; and / or,

[0025] a width of the tab connecting plate is greater than or equal to the length of the battery cell in the thickness direction of the pole connecting plate; and / or,

[0026] a width of the pole connecting plate is less than or equal to the width of the battery cell in the thickness direction of the tab connecting plate.

[0027] Advantages of the embodiments of the present application:

[0028] In the embodiments of the present application, the connecting piece is provided with a connecting protrusion on one side of the pole connecting plate for connecting with the pole, and the tab connecting plate is arranged on the other side of the pole connecting plate, so that the tab connecting plate is arranged at an angle with the pole connecting plate, and the pole connecting plate protrudes from the opposite two side surfaces of the tab connecting plate. When the tab of the battery cell is connected with at least one side surface of the pole connecting plate, the side surface of the tab can be opposite to the side surface of the tab connecting plate without bending the tab, so that the tab can be connected with the tab connecting plate, and the technical problem that the tab is easily broken during the connection of the tab with the connecting piece due to the need of bending the tab can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0030] Figure 1 a side view of one embodiment of the battery provided by the embodiments of the present application;

[0031] Figure 2 a side view of one embodiment of the battery provided by the embodiments of the present application; Figure 1 an enlarged view of A in FIG. 4;

[0032] Figure 3 a front view of one embodiment of the battery provided by the embodiments of the present application;

[0033] Figure 4 a top view of one embodiment of the battery provided by the embodiments of the present application;

[0034] Figure 5 a structural schematic view of one embodiment of the connecting piece provided by the embodiments of the present application.

[0035] Battery 10; cell assembly 11; cell 111; cell package 1111; tab 1112; connecting piece 12; pole connecting plate 121; tab connecting plate 122; connecting protrusion 123. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0037] The present application provides a connecting piece and a battery.

[0038] Figure 1 The structural schematic diagram of one embodiment of the battery provided by the present application is shown in the figure. Figure 1 As shown in the figure, the battery 10 includes a cell assembly 11 and a connecting piece 12, the cell assembly 11 includes at least one cell 111, the cell 111 is provided with a tab 1112 on one side, the tab 1112 is connected with the connecting piece 12, and the connecting piece 12 is used to connect with a pole (not shown in the figure), so that the tab 1112 is electrically connected with the pole.

[0039] In some embodiments, as shown in the figures, Figure 1 , Figure 2 and Figure 5 , the connecting piece 12 can include a pole connecting plate 121 and a tab connecting plate 122, the pole connecting plate 121 is provided with a connecting protrusion 123 on one side of the plate surface, the connecting protrusion 123 is used to connect with the pole, so that the connecting piece 12 is connected with the pole. Wherein, the connecting protrusion 123 can be inserted into the groove of the pole, and the connecting protrusion 123 is welded with the pole, so that the connection between the connecting piece 12 and the pole is more stable.

[0040] The tab connecting plate 122 is arranged on the other side of the plate surface of the pole connecting plate 121, and the tab connecting plate 122 is arranged at an angle with the pole connecting plate 121. Wherein, the pole connecting plate 121 protrudes from the opposite two sides of the plate surface of the tab connecting plate 122, and at least one side of the plate surface of the pole connecting plate 121 is used to connect with the tab 1112.

[0041] The connecting piece 12 provided by the embodiment of the present application is provided with a connecting protrusion 123 protruding from one side of the polar column connecting plate 121 for connecting with the polar column, and the other side of the polar column connecting plate 121 is provided with a tab connecting plate 122, so that the tab connecting plate 122 is arranged at an angle with the polar column connecting plate 121, and the polar column connecting plate 121 protrudes from the opposite two side surfaces of the tab connecting plate 122. When the tab 1112 of the battery cell 111 is connected with at least one side surface of the polar column connecting plate 121, the tab 1112 does not need to be bent, or the angle of the bent tab 1112 is small, so that the side surface of the tab 1112 is opposite to the surface of the tab connecting plate 122, so that the tab 1112 can be connected with the tab connecting plate 122, and the technical problem that the tab 1112 is easily broken during the connection of the tab 1112 and the connecting piece 12 can be improved.

[0042] In this way, the risk that the current output of the battery 10 is limited due to the damage or breakage of the tab 1112, thereby affecting the performance of the battery 10, can be reduced. At the same time, the risk that the electrolyte in the battery 10 leaks due to the damage or breakage of the tab 1112, thereby causing the chemical reaction in the battery 10 to be unstable, or causing the tab 1112 to block the pressure relief hole of the battery 10, thereby affecting the service life and safety performance of the battery 10, can be reduced.

[0043] The angle formed by the tab connecting plate 122 and the polar column connecting plate 121 can be an acute angle, or the polar column connecting plate 121 can be substantially perpendicular to the tab connecting plate 122. Of course, the latter can make the angle formed by the surface of the tab connecting plate 122 and the side surface of the tab 1112 smaller, thereby further reducing the bending angle of the tab 1112 when the tab 1112 is connected with the tab connecting plate 122, and further reducing the risk of breakage of the tab 1112.

[0044] In addition, both side surfaces of the tab connecting plate 122 can be used to connect with the tab 1112, or only one side surface of the tab connecting plate 122 can be used to connect with the tab 1112, which can be determined according to the number and distribution position of the tab 1112. The surface of the tab connecting plate 122 and the tab 1112 can be connected by welding or other means, which is not limited here.

[0045] In some embodiments, the thickness b of the polar column connecting plate 121 can be greater than or equal to 0.05 mm, so that the polar column connecting plate 121 has high structural strength. The thickness b of the polar column connecting plate 121 can be 0.06 mm, 0.07 mm, 0.09 mm, 0.1 mm, etc., which can be determined according to the size of the battery 10.

[0046] In addition, the thickness g of the tab connecting plate 122 can be greater than or equal to 0.05 mm, so that the tab connecting plate 122 has high structural strength. The thickness g of the tab connecting plate 122 can be 0.06 mm, 0.07 mm, 0.09 mm, 0.1 mm, etc., and can be determined according to the size of the battery 10.

[0047] It should be noted that the thickness h of the pole connecting plate 121 and the thickness g of the tab connecting plate 122 can be greater than or equal to 0.05 mm, or only one of the thickness h of the pole connecting plate 121 and the thickness g of the tab connecting plate 122 can be greater than or equal to 0.05 mm. Of course, the former can make the overall structural strength of the connecting sheet 12 higher.

[0048] In some embodiments, in the thickness direction of the pole connecting plate 121, the width e of the tab connecting plate 122 can be less than or equal to 100 mm, that is, the distance between the edge of the tab connecting plate 122 close to the pole connecting plate 121 and the edge of the tab connecting plate 122 away from the pole connecting plate 121 is less than or equal to 100 mm, so as to avoid interference between the tab connecting plate 122 and the battery cell 111 during the connection of the tab 1112 and the tab connecting plate 122. The width of the tab connecting plate 122 can be 80 mm, 60 mm, 50 mm, etc., and can be determined according to the size of the battery 10.

[0049] In some embodiments, the pole connecting plate 121 and the tab connecting plate 122 of the connecting sheet 12 can be an integral structure, so as to improve the connection strength and conductivity between the pole connecting plate 121 and the tab connecting plate 122. Alternatively, the pole connecting plate 121 and the tab connecting plate 122 of the connecting sheet 12 can be welded, so as to have high connection strength and conductivity between the pole connecting plate 121 and the tab connecting plate 122.

[0050] In some embodiments, in the thickness direction of the tab connecting plate 122, the distance from the two side edges of the pole connecting plate 121 to the tab connecting plate 122 can be substantially equal. In this way, the tab connecting plate 122 can be arranged centrally relative to the battery cell 111, which is beneficial to further reduce the bending degree of the plurality of tabs 1112 when the plurality of tabs 1112 are connected to the plate surface of the tab connecting plate 122.

[0051] Specifically, the tab connecting plate 122 is a rectangular plate. One side edge of the tab connecting plate 122 is connected to the plate surface of the pole connecting plate 121 away from the connecting protrusion 123. The pole connecting plate 121 is a rectangular plate. The thickness direction of the tab connecting plate 122 and the thickness direction of the pole connecting plate 121 are perpendicular to the length direction of the side edge of the tab connecting plate 122 used to connect the pole connecting plate 121.

[0052] In some embodiments, in the direction perpendicular to the thickness direction of the pole post connecting plate 121 and the thickness direction of the tab connecting plate 122, the length f2 of the pole post connecting plate 121 can be substantially the same as the length f1 of the tab connecting plate 122. In this way, the area of the plate surface of the tab connecting plate 122 can be increased as much as possible, so that the tab connecting plate 122 can be more conveniently connected with the tab 1112, and the conductivity between the tab connecting plate 122 and the pole post connecting plate 121 is better.

[0053] In the embodiments of the present application, the material of the pole post connecting plate 121 can include at least one of copper, aluminum, iron, nickel, silver, manganese, magnesium, zinc and gold. Similarly, the material of the tab connecting plate 122 can include at least one of copper, aluminum, iron, nickel, silver, manganese, magnesium, zinc and gold. The materials of the pole post connecting plate 121 and the tab connecting plate 122 can be the same or different.

[0054] In some embodiments, in the thickness direction of the tab connecting plate 122, the distance from the two side edges of the pole post connecting plate 121 to the connecting protrusion 123 can be substantially the same, so that the connecting protrusion 123 is closer to the tab connecting plate 122, which is conducive to improving the conductivity between the connecting protrusion 123 and the tab connecting plate 122.

[0055] In addition, in the direction perpendicular to the thickness direction of the pole post connecting plate 121 and the thickness direction of the tab connecting plate 122, the distance from the two side edges of the pole post connecting plate 121 to the connecting protrusion 123 can be substantially the same, so as to position the connecting protrusion 123 and the pole post, and enable the connecting protrusion 123 to be accurately inserted into the groove of the pole post.

[0056] Specifically, as shown in Figure 4 and Figure 5 The connecting protrusion 123 is in a cylindrical structure. The diameter of the connecting protrusion 123 can be less than or equal to 30 mm. The axis of the connecting protrusion 123 extends along the thickness direction of the pole post connecting plate 121. The axis of the connecting protrusion 123 is located at the center of the pole post connecting plate 121. That is, in the thickness direction of the tab connecting plate 122, the axis of the connecting protrusion 123 is located at the middle of the plate. In the direction perpendicular to the thickness direction of the pole post connecting plate 121 and the thickness direction of the tab connecting plate 122, the axis of the connecting protrusion 123 is located at the middle of the plate. The height of the plate surface protrusion of the connecting protrusion 123 relative to the side of the pole post connecting plate 121 away from the tab connecting plate 122 is less than or equal to 10 mm.

[0057] The embodiments of the present application also provide a battery including a connecting sheet, and the specific structure of the connecting sheet is referred to the above-mentioned embodiments. Since the battery adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0058] Among them, such as Figures 1 to 4 As shown, the battery 10 may include a cell assembly 11 and a connecting piece 12. The cell assembly 11 includes at least one cell 111, with a tab 1112 provided on one side of the cell 111. The structure of the connecting piece 12 may refer to the above-mentioned embodiments. The side of the pole connecting plate 121 of the connecting piece 12, where the tab connecting plate 122 is provided, is arranged opposite the side of the cell 111 where the tab 1112 is provided. The tab 1112 is connected to the surface of the tab connecting plate 122.

[0059] In some embodiments, multiple tabs 1112 with the same polarity can be provided on one side of the battery cell 111, and the multiple tabs 1112 with the same polarity can be distributed on both sides of the thickness direction of the tab connecting plate 122. In this way, the bending angle of the multiple tabs 1112 can be relatively small, which can minimize the risk of the tabs 1112 being broken due to bending.

[0060] The battery cell 111 may include two core packages 1111 distributed along the thickness direction of the tab connecting plate 122, with each core package 1111 having a tab 1112 connected to one side of the connecting sheet 12. The tabs 1112 correspondingly connected to the two core packages 1111 are distributed on both sides of the thickness direction of the tab connecting plate 122. That is, the tab 1112 connected to one core package 1111 is connected to one side of the tab connecting plate 122, and the tab 1112 connected to the other core package 1111 is connected to the other side of the tab connecting plate 122, thereby minimizing the bending angle of the tab 1112 connected to each core package 1111.

[0061] It should be noted that each core package 1111 can be connected to one pole ear 1112 or multiple pole ears 1112 with the same polarity. When the core package 1111 is connected to multiple pole ears 1112 with the same polarity, the multiple pole ears 1112 with the same polarity of the core package 1111 can be connected to the same side plate surface of the pole ear connecting plate 122.

[0062] Among them, after the two core packages 1111 of the battery cell 111 are brought close to each other, without bending the tabs 1112, the positive tab of one of the core packages 1111 can be welded to one side of the tab connecting plate 122 of a connecting piece 12, and the negative tab of the core package 1111 can be welded to one side of the tab connecting plate 122 of the other connecting piece 12; then, the positive tab of the other core package 1111 is welded to the other side of the tab connecting plate 122 of a connecting piece 12, and the negative tab of the core package 1111 is welded to the other side of the tab connecting plate 122 of the other connecting piece 12.

[0063] Alternatively, the positive electrode tabs of the two core packs 1111 can be aligned, the tab connecting plate 122 of one connecting piece 12 is inserted between the positive electrode tabs of the two core packs 1111, and the positive electrode tabs of the two core packs 1111 are respectively welded with the two side plate surfaces of the tab connecting plate 122 of the connecting piece 12 one by one. The tab connecting plate 122 of the other connecting piece 12 is inserted between the negative electrode tabs of the two core packs 1111, and the negative electrode tabs of the two core packs 1111 are respectively welded with the two side plate surfaces of the tab connecting plate 122 of the other connecting piece 12 one by one.

[0064] In other embodiments, the electric core 111 can also include only one core pack 1111 or more core packs 1111, and the plurality of polar tabs 1112 of the electric core 111 can also be connected with the same side plate surface of the tab connecting plate 122.

[0065] In some embodiments, in the direction perpendicular to the thickness direction of the tab connecting plate 122 and the pole connecting plate 121, the length f1 of the tab connecting plate 122 can be greater than or equal to the width of the corresponding tab 1112, and the difference between the length of the tab connecting plate 122 and the width of the corresponding tab 1112 is less than or equal to 100 mm, so that the plate surface of the tab connecting plate 122 has sufficient area to connect with the tab 1112. At the same time, it avoids that the size of the tab connecting plate 122 is too large to affect the installation of other parts in the battery 10. Wherein, the difference between the length of the tab connecting plate 122 and the width of the corresponding tab 1112 can be 80 mm, 60 mm, 50 mm, etc., which can be determined according to the structure of the connecting piece 12 and the electric core 111.

[0066] In some embodiments, in the direction perpendicular to the thickness direction of the tab connecting plate 122 and the pole connecting plate 121, the ratio of the length m of the connecting piece 12 to the length n of the electric core 111 can be less than or equal to 0.5, so as to avoid that the connecting piece 12 is too long to make the length of the battery 10 more. Wherein, the ratio of the length of the connecting piece 12 to the length of the electric core 111 can be 0.2, 0.3, 0.4, etc., which can be determined according to the structure of the connecting piece 12 and the electric core 111.

[0067] In some embodiments, in the thickness direction of the pole connecting plate 121, the width e of the tab connecting plate 122 can be greater than or equal to the length w of the tab 1112 extending from the electric core 111, so as to make the connection between the plate surface of the tab connecting plate 122 and the tab 1112 more convenient.

[0068] In some embodiments, in the thickness direction of the tab connecting plate 122, the width of the pole connecting plate 121 can be less than or equal to the width of the electric core 111, so as to avoid that the width of the pole connecting plate 121 is too large to increase the width of the battery 10.

[0069] In the embodiments of the present application, the tabs and the separator of the battery cell 111 can be stacked and wound to form the core package 1111 of the battery cell 111, and then the positive and negative tabs of the battery cell 111 are stacked in order, and the positive and negative tabs are respectively ultrasonically pre-welded, so that the stacking direction of the positive or negative tab is always along the thickness direction of each layer of the tab, thereby when the positive or negative tab stacked and welded is connected with the tab connecting plate 122 of the connecting piece 12, the positive or negative tab does not need to be bent, or the angle of the bent tab is very small.

[0070] The above describes the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manner and application range can be changed according to the idea of the present application, and the above description of the present application should not be understood as a limitation of the present application.

Claims

1. A connecting piece, characterized in that: include: A pole connecting plate, one side of which is provided with a connecting protrusion, the connecting protrusion being used to connect to the pole; The tab connection plate is provided on the other side of the pole connection plate, and the tab connection plate and the pole connection plate are arranged at an angle; The pole connecting plate protrudes from two opposite side surfaces of the tab connecting plate, and at least one side surface of the pole connecting plate is used for connecting with the tab.

2. The connecting piece according to claim 1, wherein: The thickness of the pole connecting plate and / or the tab connecting plate is greater than or equal to 0.05 mm.

3. The connecting piece according to claim 1, wherein: In the thickness direction of the pole connecting plate, the width of the tab connecting piece is less than or equal to 100 mm.

4. The connecting piece according to claim 1, wherein: The pole connecting plate and the tab connecting plate are an integral structure; or the pole connecting plate and the tab connecting plate are welded together.

5. The connecting piece according to claim 1, wherein: The pole connecting plate is substantially perpendicular to the tab connecting plate.

6. The connecting piece according to any one of claims 1 to 5, characterized in that: The tab connecting plate is a rectangular plate, and one side edge of the tab connecting plate is connected to the plate surface of the pole connecting plate facing away from the connecting protrusion; The pole connecting plate is a rectangular plate. In the thickness direction of the tab connecting plate, the distances from both side edges of the pole connecting plate to the tab connecting plate are substantially equal.

7. The connecting piece according to any one of claims 1 to 5, characterized in that: In a direction perpendicular to both the thickness direction of the pole connecting plate and the thickness direction of the tab connecting plate, the length of the pole connecting plate is substantially the same as the length of the tab connecting plate.

8. The connecting piece according to any one of claims 1 to 5, characterized in that: In the thickness direction of the tab connection plate, the distances from the two side edges of the pole connection plate to the connection protrusion are substantially the same; and / or, In a direction perpendicular to both the thickness direction of the pole connecting plate and the thickness direction of the tab connecting plate, distances from both side edges of the pole connecting plate to the connecting protrusion are substantially the same.

9. A battery, characterized in that: include: A battery cell assembly, comprising at least one battery cell, wherein a tab is provided on one side of the battery cell; The connecting piece is a connecting piece according to any one of claims 1 to 8, wherein the pole connecting plate of the connecting piece is provided with a pole tab connecting plate on one side thereof and is arranged opposite to the side of the battery cell on which the pole tab is provided, and the pole tab is connected to the plate surface of the pole tab connecting plate.

10. The battery according to claim 9, wherein A plurality of tabs with the same polarity are provided on one side of the battery core, and the plurality of tabs with the same polarity are distributed on both sides of the tab connecting plate in the thickness direction.

11. The battery according to claim 10, wherein The battery cell includes two core packages distributed along the thickness direction of the tab connecting plate, each core package is connected to the tab on one side facing the connecting sheet, and the tabs corresponding to the two core packages are distributed on both sides of the tab connecting plate in the thickness direction.

12. The battery according to any one of claims 9 to 11, characterized in that In a direction perpendicular to the thickness directions of the tab connecting plate and the pole connecting plate, the length of the tab connecting piece is greater than or equal to the corresponding tab width, and the difference between the length of the tab connecting piece and the corresponding tab width is less than or equal to 100 mm; and / or, In a direction perpendicular to the thickness directions of the tab connecting plate and the pole connecting plate, the ratio of the length of the connecting piece to the length of the battery cell is less than or equal to 0.5; and / or, In the thickness direction of the pole connecting plate, the width of the tab connecting plate is greater than or equal to the length of the tab extending from the battery cell; and / or, In the thickness direction of the tab connecting plate, the width of the pole connecting plate is less than or equal to the width of the battery cell.

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