Battery

Abstract

The present application relates to a battery, the battery comprising: a battery cell group, the battery cell group comprising at least two battery cells arranged side by side, the battery cells being provided with a positive electrode ear and a negative electrode ear; a battery cover plate, the battery cover plate being provided at the end of the battery cell group, the battery cover plate being provided with a positive electrode column and a negative electrode column; at least two first connecting pieces and at least two second connecting pieces, the first connecting piece and the positive electrode ear corresponding one-to-one, the positive electrode ear, the first connecting piece and the positive electrode column being connected in sequence, the second connecting piece and the negative electrode ear corresponding one-to-one, the negative electrode ear, the second connecting piece and the negative electrode column being connected in sequence. According to the battery of the present application, connecting at least two battery cells in parallel can reduce the internal resistance of the battery, thereby improving the current discharge capacity, reducing the voltage drop, improving the load capacity and reducing the heat generated by the internal resistance, thereby improving the performance of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery. Background Art

[0002] In lithium-ion batteries, the heat distribution and heat dissipation rate of soft-pack, cylindrical and square-shell batteries are uneven (the surface thermal conductivity of the material, current density, resistance, battery structure, etc. will affect the heat dissipation inside the battery), and the electrochemical performance of lithium ions is greatly affected by temperature.

[0003] Many aging mechanisms in lithium-ion batteries are related to temperature. At high temperatures, the solid electrolyte interface film grows faster at the negative electrode, becoming more sparse and unstable. Almost all aging reactions are accelerated under high temperatures. The temperature at the tab is significantly higher than other locations; the temperature rises better on one side of the tab on the same side. The uneven heating at each point of the battery cell leads to poor consistency of lithium-ion batteries. Utility Model Content

[0004] The present application provides a battery to solve the problem of poor performance caused by large differences in battery temperature rise.

[0005] The battery according to the present application comprises:

[0006] A battery cell group, the battery cell group comprising at least two battery cells arranged side by side, the battery cells being provided with a positive electrode tab and a negative electrode tab;

[0007] A battery cover plate, the battery cover plate is arranged at the end of the battery cell group, and the battery cover plate is provided with a positive electrode column and a negative electrode column;

[0008] At least two first connecting pieces and at least two second connecting pieces, the first connecting pieces and the positive electrode ears correspond one to one, the positive electrode ears, the first connecting pieces and the positive electrode columns are connected in sequence, the second connecting pieces and the negative electrode ears correspond one to one, the negative electrode ears, the second connecting pieces and the negative electrode columns are connected in sequence.

[0009] According to the battery of the present application, the battery cell group includes a first end and a second end opposite to each other along a first direction, and the first end and the second end both extend along the second direction. The battery cell group also includes a third end, and the third end is located between the first end and the second end, and the third end extends along the first direction. The third end is opposite to the battery cover plate, and the first end is provided with the positive pole ear, and the length of the positive pole ear in the second direction is greater than twice the width of the positive pole ear in the first direction. The second end is provided with the negative pole ear, and the length of the negative pole ear in the second direction is greater than twice the width of the negative pole ear in the first direction, wherein the first direction is perpendicular to the second direction.

[0010] Optionally, a first groove is provided on a side of the first connecting sheet facing away from the battery cell, and the positive electrode tab is bent and embedded in the first groove; a second groove is provided on a side of the second connecting sheet facing away from the battery cell, and the negative electrode tab is bent and embedded in the second groove.

[0011] Optionally, the width of the first connecting sheet and the second connecting sheet are both smaller than the thickness of the battery cell.

[0012] Optionally, the positive electrode ear includes a plurality of first metal sheets, which are divided into two groups and are bent from both sides of the first connecting sheet and embedded in the first groove, and the negative electrode ear includes a plurality of second metal sheets, which are divided into two groups and are bent from both sides of the second connecting sheet and embedded in the second groove.

[0013] Optionally, the first connecting piece and the second connecting piece each include a main body portion and a clamping portion connected in sequence, the main body portion is provided with the first groove or the second groove, the battery cover is provided with a plurality of clamping slots, the clamping slot corresponds to at least one of the clamping portions, the clamping portion is clamped in the clamping slot and connected to the positive electrode column or the negative electrode column in the clamping slot.

[0014] Optionally, the clamping portion is provided with a first guide surface on at least one side in the width direction, the first guide surface is inclined in a direction gradually away from the main body portion toward the other side in the width direction gradually approaching the clamping portion, and the clamping slot is provided with a second guide surface, the second guide surface is in contact with the first guide surface.

[0015] Optionally, the clamping slots correspond to the clamping portions one-to-one, and the clamping portions are provided with the first guide surfaces on both sides in the width direction.

[0016] Optionally, the main body forms a boss in the circumferential direction of the clamping portion, and the boss abuts against the circumferential edge of the clamping groove.

[0017] According to the battery of the present application, the first connecting piece is connected to the positive electrode lug and the positive electrode column by welding, and the second connecting piece is connected to the negative electrode lug and the negative electrode column by welding.

[0018] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0019] The battery provided in the embodiment of the present application connects at least two battery cells in parallel, which can reduce the internal resistance of the battery and thus improve the current discharge capacity, reduce the voltage drop, increase the load capacity and reduce the heat generated by the internal resistance, thereby improving the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0023] Figure 1 An exploded diagram of a battery provided in an embodiment of the present application;

[0024] Figure 2 An exploded view of a battery provided in an embodiment of the present application from another angle;

[0025] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0026] Figure 4 An exploded view of a battery provided in an embodiment of the present application from another angle;

[0027] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0028] Figure 6 An exploded view of a battery provided in an embodiment of the present application from another angle.

[0029] Description of reference numerals:

[0030] Battery cell group 10, battery cell 11, positive ear 12, first metal sheet 121, negative ear 13, second metal sheet 131, battery cover 20, positive electrode column 21, negative electrode column 22, slot 23, first connecting piece 30, first groove 31, main body 32, boss 321, clamping portion 33, first guide surface 331, second connecting piece 40, second groove 41. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0033] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0034] like Figure 1 and Figure 2 As shown, the battery according to the present application includes a battery cell group 10 , a battery cover 20 , at least two first connecting plates 30 and at least two second connecting plates 40 .

[0035] Specifically, the battery cell group 10 includes at least two battery cells 11 arranged side by side, and the battery cell 11 is provided with a positive electrode ear 12 and a negative electrode ear 13; the battery cover 20 is arranged at the end of the battery cell group 10, and the battery cover 20 is provided with a positive electrode column 21 and a negative electrode column 22; the first connecting piece 30 and the positive electrode ear 12 correspond one-to-one, and the positive electrode ear 12, the first connecting piece 30 and the positive electrode column 21 are connected in sequence, and the second connecting piece 40 and the negative electrode ear 13 correspond one-to-one, and the negative electrode ear 13, the second connecting piece 40 and the negative electrode column 22 are connected in sequence.

[0036] In detail, the battery cell group 10 includes at least two battery cells 11 arranged side by side, the positive electrode ear 12 of each battery cell 11 is electrically connected to the positive electrode column 21 by using the first connecting piece 30, and the negative electrode ear 13 of each battery cell 11 is electrically connected to the negative electrode column 22 by using the second connecting piece 40. The first connecting pieces 30 corresponding to two adjacent battery cells 11 are independent of each other and are not shared, so as to realize connecting at least two battery cells 11 in parallel. The first connecting piece 30 and the second connecting piece 40 can increase the surface area of ​​heat conduction, and the positive electrode column 21 and the negative electrode column 22 are exposed to the air, which can accelerate the heat transfer and improve the heat dissipation speed of the battery cell 11, thereby ensuring the temperature consistency of the battery cell 11, and then ensuring the uniformity of the battery cell 11 and extending the service life of the battery cell 11.

[0037] It should be noted that the number of parallel-connected battery cells 11 can be set as needed to form batteries of different specifications, and this application does not impose any limitation.

[0038] In addition, the battery cell group 10 includes at least two battery cells 11 , that is, the battery cell group 10 may include two battery cells 11 , three battery cells 11 , four battery cells 11 , five battery cells 11 , six battery cells 11 , etc., and the required number can be set as needed.

[0039] According to the battery of the embodiment of the present application, at least two battery cells 11 are connected in parallel, which can reduce the internal resistance of the battery, thereby improving the current discharge capacity, reducing the voltage drop, increasing the load capacity and reducing the heat generated by the internal resistance, thereby improving the performance of the battery.

[0040] like Figure 1 and Figure 2 As shown, according to the battery of the embodiment of the present application, the battery cell group 10 includes a first end and a second end opposite to each other along a first direction, and the first end and the second end both extend along the second direction. The battery cell group 10 also includes a third end, and the third end is located between the first end and the second end. The third end extends along the first direction, and the third end is opposite to the battery cover 20. The first end is provided with a positive pole ear 12, and the length of the positive pole ear 12 in the second direction is greater than twice the width of the positive pole ear 12 in the first direction. The second end is provided with a negative pole ear 13, and the length of the negative pole ear 13 in the second direction is greater than twice the width of the negative pole ear 13 in the first direction, wherein the first direction is perpendicular to the second direction.

[0041] In detail, the first end and the second end of the battery cell group 10 are respectively provided with a positive electrode ear 12 and a negative electrode ear 13, that is, the positive electrode ear 12 of each battery cell 11 of the battery cell group 10 is located on the same side of the battery cell group 10 and is spaced from each other, and the negative electrode ear 13 of each battery cell 11 of the battery cell group 10 is located on the same side of the battery cell group 10 and is spaced from each other. In this way, the arrangement of the two end output ears (positive electrode ear 12 or negative electrode ear 13) of the battery cell 11 can effectively reduce the temperature unevenness of the battery cell 11 and improve the consistency of the battery cell 11, and each electrode ear (positive electrode ear 12 or negative electrode ear 13) corresponds to a connecting piece (first connecting piece 30 or the second connecting piece 40), which will speed up the heat conduction speed, thereby improving the heat dissipation speed of the battery cell 11, and the uniformity of the temperature of the battery cell 11 can effectively ensure the uniformity of the battery cell 11, and the length of the positive electrode ear 12 in the second direction is greater than twice the width of the positive electrode ear 12 in the first direction, and the length of the negative electrode ear 13 in the second direction is greater than twice the width of the negative electrode ear 13 in the first direction, which is also to increase the size of the electrode ear, thereby speeding up the heat transmission speed, improving the heat dissipation speed of the battery cell 11, and the uniformity of the temperature of the battery cell 11 can effectively ensure the uniformity of the battery cell 11. For example, the length of the positive electrode ear 12 is 2.5 times, 3 times, 3.5 times, and 4 times the width of the positive electrode ear 12.

[0042] According to the battery of the embodiment of the present application, the surface area of ​​the connecting pieces (the first connecting piece 30 and the second connecting piece 40) arranged at both ends is larger than the surface area of ​​the connecting piece at one side. The larger surface area allows faster heat conduction, which can accelerate the transfer of heat.

[0043] like Figure 2 and Figure 3 As shown, in some embodiments, a first groove 31 is provided on the side of the first connecting sheet 30 facing away from the battery cell 11, and the positive electrode ear 12 is bent and embedded in the first groove 31; a second groove 41 is provided on the side of the second connecting sheet 40 facing away from the battery cell 11, and the negative electrode ear 13 is bent and embedded in the second groove 41.

[0044] In detail, the positive electrode ear 12 is bent and embedded in the first groove 31 and the negative electrode ear 13 is bent and embedded in the second groove 41, which can facilitate the positioning of the connecting piece and the electrode ear during assembly and the convenience during welding or riveting, and is easy to align and easy to position after alignment without misalignment.

[0045] like Figure 4 and Figure 5 As shown, in some embodiments, the width of the first connecting sheet 30 and the second connecting sheet 40 are both smaller than the thickness of the battery cell 11 .

[0046] It can be understood that such a configuration can facilitate the positive electrode ear 12 to be inserted into the first groove 31 of the first connecting plate 30, and facilitate the negative electrode ear 13 to be inserted into the second groove 41 of the second connecting plate 40, thereby ensuring the contact area between the electrode ear (positive electrode ear 12 or negative electrode ear 13) and the connecting plate (first connecting plate 30 or second connecting plate 40) and avoiding poor contact.

[0047] like Figure 3-Figure 6 As shown, in some embodiments, the positive electrode ear 12 includes a plurality of first metal sheets 121, which are divided into two groups and are bent from both sides of the first connecting sheet 30 and embedded in the first groove 31, respectively. The negative electrode ear 13 includes a plurality of second metal sheets 131, which are divided into two groups and are bent from both sides of the second connecting sheet 40 and embedded in the second groove 41, respectively.

[0048] In detail, the positive electrode ear 12 includes a plurality of first metal sheets 121, which are divided into two groups and are bent from both sides of the first connecting sheet 30 and embedded in the first groove 31, respectively. This makes it easier to position the first connecting sheet 30 and increases the contact area between the positive electrode ear 12 and the first connecting sheet 30, while making the connection between the positive electrode ear 12 and the first connecting sheet 30 more stable (regardless of whether welding or riveting is added later).

[0049] The negative electrode ear 13 includes a plurality of second metal sheets 131, which are divided into two groups and are bent from both sides of the second connecting sheet 40 and embedded in the second groove 41, respectively. This makes it easier to position the second connecting sheet 40 and increases the contact area between the negative electrode ear 13 and the second connecting sheet 40, while making the connection between the negative electrode ear 13 and the second connecting sheet 40 more stable (regardless of whether welding or riveting is added later).

[0050] In some embodiments, the first connecting piece 30 and the second connecting piece 40 both include a main body portion 32 and a clamping portion 33 connected in sequence, the main body portion 32 is provided with a first groove 31 or a second groove 41, and the battery cover 20 is provided with multiple clamping slots 33, the clamping slot 33 corresponds to at least one clamping portion 33, and the clamping portion 33 is clamped in the clamping slot 33 and connected to the positive electrode column 21 or the negative electrode column 22 in the clamping slot 33.

[0051] In detail, the first connecting piece 30 and the second connecting piece 40 each include a main body 32 and a clamping part 33 connected in sequence, and the main body 32 is provided with a first groove 31 or a second groove 41, which means that the main body 32 of the first connecting piece 30 is provided with a first groove 31, and the main body 32 of the second connecting piece 40 is provided with a second groove 41. A clamping groove 33 is provided on the battery cover 20, and a part of the positive electrode column 21 or the negative electrode column 22 is exposed in the corresponding clamping groove 33, so that the clamping part 33 clamped in the clamping groove 33 can contact and electrically conduct with the corresponding positive electrode column 21 or the negative electrode column 22, and the clamping part 33 is clamped in the clamping groove 33, and the clamping groove 33 can correspond to at least one clamping part 33 of the first connecting piece 30, so as to play a role of positioning and limiting in the process of riveting or welding the first connecting piece 30 and the positive electrode column 21, and reduce the possibility of poor connection of the contact surface.

[0052] It should be noted that the card slot 33 may correspond to at least one card connection portion 33 of the first connecting piece 30 . For example, two card connection portions 33 of the first connecting piece 30 may be carded in the card slot 33 , or one card connection portion 33 of the first connecting piece 30 may be carded in the card slot 33 .

[0053] like Figure 3 As shown, in some embodiments, a first guide surface 331 is provided on at least one side of the clamping portion 33 in the width direction, and the first guide surface 331 is inclined in a direction gradually away from the main body portion 32 toward the other side of the width direction gradually approaching the clamping portion 33, and a second guide surface is provided on the clamping slot 33, and the second guide surface is in contact with the first guide surface 331.

[0054] In detail, a first guide surface 331 is provided on at least one side of the clamping portion 33 in the width direction, and the first guide surface 331 is inclined in a direction gradually away from the main body portion 32 toward the other side of the width direction gradually approaching the clamping portion 33, and a second guide surface is provided on the slot 33, and the second guide surface is in contact with the first guide surface 331. In this way, when the clamping portion 33 is inserted into the slot 33, the cooperation between the first guide surface 331 and the second guide surface can be utilized to guide the clamping portion 33, thereby reducing the difficulty of inserting the clamping portion 33 into the slot 33. At the same time, the second guide surface is in contact with the first guide surface 331, which can increase the contact area between the clamping portion 33 and the slot 33, and the first guide surface 331 is inclined in a direction gradually away from the main body portion 32 toward the other side of the width direction gradually approaching the clamping portion 33, so that the first guide surface 331 can further reduce the difficulty of inserting the clamping portion 33 into the slot 33.

[0055] like Figure 2 As shown, in some embodiments, the card slots 33 correspond to the card connection portions 33 one by one, and the card connection portions 33 are provided with first guide surfaces 331 on both sides in the width direction.

[0056] In detail, the card slot 33 corresponds to the card connection portion 33 one by one, and the card connection portion 33 is provided with a first guide surface 331 on both sides in the width direction, and a second guide surface is provided on both sides of the card slot 33. The two second guide surfaces are respectively fitted with the corresponding first guide surfaces 331, thereby further reducing the difficulty of inserting the card connection portion 33 into the card slot 33 and increasing the contact area between the card connection portion 33 and the card slot 33.

[0057] like Figure 3 As shown, in some embodiments, the main body 32 forms a boss 321 in the circumferential direction of the clamping portion 33 , and the boss 321 abuts against the circumferential edge of the clamping groove 33 .

[0058] In detail, the main body 32 forms a boss 321 in the circumferential direction of the clamping portion 33, and the boss 321 abuts against the circumferential edge of the slot, which can improve the positioning accuracy between the clamping portion 33 and the slot 33, make the fit between the clamping portion 33 and the slot 33 more stable, and at the same time increase the contact area between the clamping portion 33 and the pole (positive pole 21 or negative pole 22).

[0059] According to the battery of the embodiment of the present application, the first connecting piece 30 is welded to the positive electrode lug 12 and the positive electrode column 21 , and the second connecting piece 40 is welded to the negative electrode lug 13 and the negative electrode column 22 .

[0060] In detail, the first connecting piece 30 and the positive electrode ear 12 and the positive electrode column 21 are all welded, so that the connection between the first connecting piece 30 and the positive electrode ear 12 and the positive electrode column 21 is reliable, and the reliability can still be guaranteed when the battery is subjected to vibration and works for a long time in an adverse environment. The second connecting piece 40 and the negative electrode ear 13 and the negative electrode column 22 are all welded, so that the connection between the second connecting piece 40 and the negative electrode ear 13 and the negative electrode column 22 is reliable, and the reliability can still be guaranteed when the battery is subjected to vibration and works for a long time in an adverse environment.

[0061] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0062] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0063] The above are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A battery, characterized in that: include: A battery cell group, the battery cell group comprising at least two battery cells arranged side by side, the battery cells being provided with a positive electrode tab and a negative electrode tab; A battery cover plate, the battery cover plate is arranged at the end of the battery cell group, and the battery cover plate is provided with a positive electrode column and a negative electrode column; At least two first connecting pieces and at least two second connecting pieces, the first connecting pieces and the positive electrode ears correspond one to one, the positive electrode ears, the first connecting pieces and the positive electrode columns are connected in sequence, the second connecting pieces and the negative electrode ears correspond one to one, the negative electrode ears, the second connecting pieces and the negative electrode columns are connected in sequence.

2. The battery according to claim 1, characterized in that The battery cell group includes a first end and a second end opposite to each other along a first direction, and the first end and the second end both extend along the second direction. The battery cell group also includes a third end, and the third end is located between the first end and the second end, and the third end extends along the first direction. The third end is opposite to the battery cover plate. The first end is provided with the positive electrode ear, and the length of the positive electrode ear in the second direction is greater than twice the width of the positive electrode ear in the first direction. The second end is provided with the negative electrode ear, and the length of the negative electrode ear in the second direction is greater than twice the width of the negative electrode ear in the first direction, wherein the first direction is perpendicular to the second direction.

3. The battery according to claim 2, characterized in that A first groove is provided on the side of the first connecting sheet away from the battery cell, and the positive electrode tab is bent and embedded in the first groove. A second groove is provided on the side of the second connecting sheet away from the battery cell, and the negative electrode tab is bent and embedded in the second groove.

4. The battery according to claim 3, characterized in that The widths of the first connecting sheet and the second connecting sheet are both smaller than the thickness of the battery core.

5. The battery according to claim 3, characterized in that The positive electrode ear includes a plurality of first metal sheets, which are divided into two groups and are bent from both sides of the first connecting sheet and embedded in the first groove, respectively. The negative electrode ear includes a plurality of second metal sheets, which are divided into two groups and are bent from both sides of the second connecting sheet and embedded in the second groove, respectively.

6. The battery according to claim 3, characterized in that The first connecting piece and the second connecting piece each include a main body portion and a clamping portion connected in sequence, the main body portion is provided with the first groove or the second groove, the battery cover is provided with a plurality of clamping slots, the clamping slot corresponds to at least one of the clamping portions, the clamping portion is clamped in the clamping slot and connected to the positive electrode column or the negative electrode column in the clamping slot.

7. The battery according to claim 6, characterized in that The clamping portion is provided with a first guide surface on at least one side in the width direction, and the first guide surface is inclined in a direction gradually away from the main body toward the other side in the width direction gradually approaching the clamping portion. The clamping slot is provided with a second guide surface, and the second guide surface is in contact with the first guide surface.

8. The battery according to claim 7, characterized in that The clamping grooves correspond to the clamping portions one by one, and the clamping portions are provided with the first guide surfaces on both sides in the width direction.

9. The battery according to claim 7, characterized in that The main body forms a boss in the circumferential direction of the clamping portion, and the boss abuts against the circumferential edge of the clamping groove.

10. The battery according to any one of claims 1 to 9, characterized in that: The first connecting piece is connected to the positive electrode lug and the positive electrode column by welding, and the second connecting piece is connected to the negative electrode lug and the negative electrode column by welding.

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