Battery and method for manufacturing the same

Abstract

The present invention relates to the field of battery technology, and discloses a battery and a manufacturing method thereof, including: a minimum repeating unit, including two pole cores arranged side by side and symmetrically, the pole ears of the two pole cores are welded to the same connecting piece, a number of minimum repeating units are provided, a number of pole cores of a number of minimum repeating units are arranged to form a battery cell, a number of connecting pieces of a number of minimum repeating units are arranged, the edges of adjacent connecting pieces abut against each other, and a number of connecting pieces are connected; a cover plate is connected to a number of connecting pieces; a shell, the battery cell is arranged in the shell, the cover plate blocks the opening of the shell and is connected to the shell. The pole cores in a number of minimum repeating units of the present invention are of the same structure, and can be manufactured using the same equipment and processing steps, the processing process is simple, the singleness of the equipment, the consistency of the processing process and the uniformity of the product are achieved, and the manufacturing cost and management cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to batteries and methods for manufacturing the same. Background Art

[0002] As the battery market is booming, battery products are developing towards large capacity. At present, the assembly of battery pole cores usually adopts a parallel assembly process of four (multiple) pole cores, specifically: first connect two pole cores in parallel to form a core, then connect another two pole cores in parallel to form a core, weld the pole ears of the two bipolar cores to the same connecting piece, connect the connecting piece to the current lead-out part of the shell, and use the shell to encapsulate the pole core. However, when welding the pole ears to the connecting piece, since different pole cores are in different positions, the positions of the pole ears are different, so the pole ears of different pole cores are also different, and there will be differences when making different pole cores, that is, it is necessary to design a variety of pole pieces for processing pole cores, which will complicate the processing process and increase manufacturing and management costs. Summary of the invention

[0003] In view of this, the present invention provides a battery and a method for manufacturing the same to solve the problems of complex processing and increased manufacturing and management costs in the existing battery manufacturing process.

[0004] In the first aspect, the present invention provides a battery, comprising: a minimum repeating unit, comprising two pole cores arranged side by side and symmetrically, the pole ears of the two pole cores being welded to the same connecting piece, a plurality of the minimum repeating units being provided, a plurality of the pole cores of a plurality of the minimum repeating units being arranged to form a battery cell, a plurality of the connecting pieces of a plurality of the minimum repeating units being arranged to have edges of adjacent connecting pieces abutting against each other, and a plurality of the connecting pieces being connected and provided; a cover plate being connected and provided to the plurality of connecting pieces; and a shell, the battery cell being provided in the shell, the cover plate sealing an opening of the shell and being connected to the shell.

[0005] Beneficial effects: A minimum repeating unit is formed by welding two symmetrically arranged pole cores and a connecting sheet, and then several minimum repeating units are combined to form a battery cell, which meets the large capacity requirements of the battery; moreover, the pole cores in the several minimum repeating units have the same structure and can be manufactured using the same equipment and processing procedures. The processing process is simple, achieving the uniformity of equipment, consistency of processing and uniformity of products, and reducing manufacturing costs and management costs.

[0006] In an optional embodiment, the connecting piece includes: a pole lug connecting portion, which is welded to the pole lug, and the weight of the pole lug connecting portion is m1; an abutting portion, which is connected to the pole lug connecting portion, and the abutting portion is arranged on two opposite sides of the pole lug connecting portion, and adjacent connecting pieces are abutted by the abutting portion, and the weight of the abutting portion is m2, satisfying m1>m2.

[0007] Beneficial effect: The weight of the connecting piece is concentrated at the connection part of the pole ear, so that the connecting piece can be used as a reference point at the position where it is connected to the pole ear. During the vibration process, the connecting piece can be evenly arranged by taking advantage of the concentrated weight of the connecting piece itself.

[0008] In an optional embodiment, the weight m1 of the tab connecting portion and the weight m2 of the abutting portion satisfy 3≤m1 / m2≤6.

[0009] In an optional embodiment, the tab connection portion includes a base sheet and a thickened sheet, the base sheet and the thickened sheet are stacked, the abutment portion is connected to the base sheet, and the thickened sheet is welded to the tab.

[0010] Beneficial effect: By adding a thickening sheet to the base sheet, the weight of the tab connection portion is increased, and the positioning connection between the tab and the thickening sheet is facilitated.

[0011] In an optional embodiment, a slope structure is formed on the side of the abutment portion away from the pole lug connection portion, and the slope structures of the abutment portions located on both sides of the pole lug connection portion have the same inclination direction; the two slope structures corresponding to two adjacent connecting sheets are adapted to be connected.

[0012] Beneficial effect: By forming a slope structure on the side of the abutting portion, it is convenient for adjacent connecting pieces to abut against each other, thereby improving the flatness of the splicing of adjacent connecting pieces.

[0013] In an optional embodiment, the side of the abutment portion away from the pole lug connection portion has an insert block and / or a slot, the insert block of the abutment portion located on one side of the pole lug connection portion is arranged corresponding to the slot of the abutment portion located on the other side of the pole lug connection portion; the insert blocks and slots corresponding to two adjacent connecting sheets are inserted into each other.

[0014] Beneficial effect: Adjacent connecting pieces are correspondingly plugged in through the plug blocks and the slots, further ensuring that several connecting pieces can be aligned.

[0015] In the second aspect, the present invention also provides a battery manufacturing method, comprising the steps of: arranging two pole cores side by side and symmetrically, welding the pole ears of the two pole cores to the same connecting piece to form a minimum repeating unit; arranging the pole cores of several minimum repeating units to form a battery cell, and arranging several connecting pieces so that the edges of adjacent connecting pieces abut against each other; connecting several connecting pieces by welding, and welding the connecting pieces to the cover plate at the same time; loading the battery cell into a shell so that the cover plate encapsulates the shell.

[0016] Beneficial effects: A minimum repeating unit is formed by welding two symmetrically arranged pole cores and a connecting sheet, and then several minimum repeating units are combined to form a battery cell, which meets the large capacity requirements of the battery; moreover, the pole cores in the several minimum repeating units have the same structure and can be manufactured using the same equipment and processing procedures. The processing process is simple, achieving the uniformity of equipment, consistency of processing and uniformity of products, and reducing manufacturing costs and management costs.

[0017] In an optional embodiment, the method of arranging the pole cores of several minimum repeating units to form a battery cell and arranging several connecting sheets so that the edges of adjacent connecting sheets abut against each other includes the steps of: aligning the pole cores of several minimum repeating units by means of a positioning tool; driving the several minimum repeating units to vibrate by means of a vibration device, wherein the amplitude direction of the vibration device is set along the arrangement direction of the several connecting sheets so that the edges of adjacent connecting sheets abut against each other and the several connecting sheets are aligned; and clamping and fixing the several arranged connecting sheets by means of a clamping tool.

[0018] Beneficial effect: By utilizing vibration, several connecting pieces are made to be uniform during the vibration process, thereby achieving a smooth arrangement of several connecting pieces.

[0019] In an optional implementation, when the vibration device drives a plurality of minimum repeating units to vibrate, the plurality of minimum repeating units are arranged in an inverted manner with the pole core on top and the connecting sheet on the bottom.

[0020] Beneficial effect: During the vibration process, several minimum repeating units are in an inverted state, which is more conducive to the unification of several connecting pieces under the combined action of vibration and their own gravity. In addition, the inverted state facilitates the subsequent welding of several connecting pieces and the cover plate.

[0021] In an optional embodiment, the step of connecting the plurality of connecting plates by welding and welding the connecting plates to the cover plate at the same time comprises the steps of: welding the two connecting plates at the connecting position of the two slope structures of two adjacent connecting plates and welding them to the cover plate at the same time; and / or welding the plurality of connecting plates along the arrangement direction of the plurality of connecting plates, the welding position corresponding to the plug-in position of the plug-in block and the slot, and welding them to the cover plate at the same time.

[0022] Beneficial effects: welding is performed at the position where the two slope structures cooperate, preventing the assembly gap between adjacent connecting pieces from causing leakage of laser beams and insufficient filling of molten welding materials, thereby ensuring welding strength and guide area; directly welding several connecting pieces along the arrangement direction of several connecting pieces, and correspondingly welding adjacent connecting pieces at the plug-in position, and the welding method is simple and easy to operate; when connecting several connecting pieces by welding, the welding process can also simultaneously connect several connecting pieces to the cover plate, simplifying the welding process, which is conducive to welding operations under narrow welding space conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a front view of a connecting piece according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A top view of the connecting piece shown;

[0026] Figure 3 For several Figure 1 A schematic diagram of the connection structure of the connecting piece shown;

[0027] Figure 4 For several Figure 2 A schematic diagram of the connection structure of the connecting piece shown;

[0028] Figure 5 for Figure 4 A schematic diagram of weld marks after welding of several connecting pieces shown;

[0029] Figure 6 A schematic diagram of the structure of a minimum repeating unit according to an embodiment of the present invention;

[0030] Figure 7 For several Figure 6 Schematic diagram of the structure when the minimum repeating unit is arranged and in an inverted state.

[0031] Description of reference numerals:

[0032] 1. Pole core; 11. Pole ear; 2. Connecting piece; 21. Pole ear connecting part; 211. Base piece; 212. Thickening piece; 22. Abutting part; 221. Slope structure; 222. Insert block; 223. Slot; 3. Welding mark; 10. Minimum repeating unit. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] Combine the following Figures 1 to 7 , describing an embodiment of the present invention.

[0035] According to an embodiment of the present invention, on the one hand, a battery is provided, comprising: a minimum repeating unit 10, a cover plate and a shell. The minimum repeating unit 10 comprises two pole cores 1 arranged side by side and symmetrically, and the pole ears 11 of the two pole cores 1 are welded to the same connecting piece 2. There are several minimum repeating units 10, and several pole cores 1 of several minimum repeating units 10 are arranged to form a battery cell, and several connecting pieces 2 of several minimum repeating units 10 are arranged, and the edges of adjacent connecting pieces 2 abut against each other, and several connecting pieces 2 are connected. The cover plate is connected to the several connecting pieces 2, and the battery cell is arranged in the shell, and the cover plate blocks the opening of the shell and is connected to the shell.

[0036] Two symmetrically arranged pole cores 1 and a connecting sheet 2 are welded to form a minimum repeating unit 10, and then several minimum repeating units 10 are combined to form a battery cell to meet the large capacity requirements of the battery; moreover, the pole cores 1 in the several minimum repeating units 10 have the same structure and can be manufactured using the same equipment and processing procedures. The processing process is simple, achieving the unity of equipment, consistency of processing and uniformity of products, thereby reducing manufacturing costs and management costs.

[0037] It is worth noting that the symmetrically arranged pole ears 11 of the two pole cores 1 are connected to a connecting piece 2 at the same time, which can not only unify the size of the pole ears 11, but also fully reduce the length of the pole ears 11, reduce the distance between the connecting piece 2 and the end face of the pole core 1 (the lead-out face of the pole ears 11), and improve the battery space utilization rate; and, please refer to Figure 6The pole ear 11 is connected to the connecting sheet 2 in a natural arc, and there is no need to perform additional bending processing on the pole ear 11, which simplifies the processing steps. Furthermore, the shape of the pole ear 11 that has not been bent is easy to control, which prevents the pole ear 11 from being inserted back into the sheet part of the pole core 1, avoiding the risk of short circuit caused by the overlap of the positive and negative electrodes.

[0038] It should be noted that the pole core 1 of the current battery has two forms: winding and lamination. The pole core 1 of this embodiment can be winding or lamination. The two sides of the winding battery are semicircular, and the space utilization rate is low. The laminated battery can overcome the shortcomings of the winding type. Its shape is a rectangular pole piece that does not need to be bent, and the space utilization rate is high. With the growing prosperity of the energy storage market, energy storage battery products are developing towards large capacity. Large-capacity batteries will make the pole core 1 develop in the direction of large thickness. For the laminated pole core 1, the number of lamination layers gradually increases, resulting in higher requirements for lamination equipment and lamination process, which in turn leads to increased production costs, and the production quality is not easy to guarantee. In this embodiment, each pole core 1 can maintain a smaller thickness, that is, a smaller number of lamination layers. Therefore, the requirements for lamination equipment (such as the size requirements of some workstations) are reduced, and the lamination equipment can be controlled within a smaller range of variation. The alignment of the lamination is easy to ensure, thereby ensuring the quality of the lamination.

[0039] It is worth noting that the present embodiment adopts a repeated arrangement of the minimum repeating units 10, and the number of the minimum repeating units 10 can be flexibly adjusted according to the required thickness / capacity of the battery to achieve serialized design and assembly.

[0040] In one embodiment, Figure 1 and Figure 2 As shown, the connecting piece 2 includes a tab connecting portion 21 and an abutting portion 22. The tab connecting portion 21 is welded to the tab 11, and the weight of the tab connecting portion 21 is m1; the abutting portion 22 is connected to the tab connecting portion 21, and the abutting portion 22 is arranged on two opposite sides of the tab connecting portion 21, and adjacent connecting pieces 2 are abutted by the abutting portion 22, and the weight of the abutting portion 22 is m2, satisfying m1>m2.

[0041] The weight of the connecting sheet 2 is concentrated at the pole lug connection portion 21, so that the connecting sheet 2 can be connected to the pole lug 11 as a reference point. During the vibration process, the connecting sheet 2 can be evenly arranged by taking advantage of the concentrated weight of the connecting sheet 2.

[0042] Specifically, in one embodiment, the weight m1 of the tab connection portion 21 and the weight m2 of the abutment portion 22 satisfy 3≤m1 / m2≤6. Preferably, 4≤m1 / m2≤5, which can achieve the best welding effect.

[0043] In one embodiment, Figure 1As shown, the tab connection portion 21 includes a base sheet 211 and a thickened sheet 212, the base sheet 211 and the thickened sheet 212 are stacked, the abutment portion 22 is connected to the base sheet 211, and the thickened sheet 212 is welded to the tab 11. By adding the thickened sheet 212 to the base sheet 211, the weight of the tab connection portion 21 is increased, the weight ratio of the tab connection portion 21 and the abutment portion 22 is controlled, and the positioning connection of the tab 11 and the thickened sheet 212 is facilitated.

[0044] It is worth mentioning that please refer to Figure 1 The base sheet 211 and the abutting portion 22 are arranged with equal thickness and are located in the same horizontal plane, and the thickening sheet 212 is arranged on a side of the base sheet 211 facing the pole core 1 .

[0045] In one embodiment, Figure 1 and Figure 2 As shown, a slope structure 221 is formed on the side of the abutting portion 22 away from the tab connection portion 21, and the slope structures 221 of the abutting portion 22 located on both sides of the tab connection portion 21 have the same inclination direction; the two slope structures 221 corresponding to two adjacent connecting pieces 2 are adapted to be connected. By forming the slope structure 221 on the side of the abutting portion 22, it is convenient for adjacent connecting pieces 2 to cooperate and abut, and the flatness of the splicing of adjacent connecting pieces 2 is improved.

[0046] It is worth mentioning that please refer to Figure 1 and Figure 2 The left side surface of the abutting portion 22 located on the left side of the tab connecting portion 21 forms a slope structure 221, and the right side surface of the abutting portion 22 located on the right side of the tab connecting portion 21 forms a slope structure 221. Therefore, for one connecting piece 2, there are two slope structures 221 on the left and right sides.

[0047] For further explanation, please refer to Figure 3 and Figure 4 For two adjacent connecting pieces 2 , the slope structure 221 on the right side of the connecting piece 2 on the left side is adapted to be connected with the slope structure 221 on the left side of the connecting piece 2 on the right side.

[0048] In one embodiment, see Figure 1 and Figure 2 The side of the abutment portion 22 away from the tab connection portion 21 has an insert block 222 and / or a slot 223, and the insert block 222 of the abutment portion 22 located on one side of the tab connection portion 21 is correspondingly arranged with the slot 223 of the abutment portion 22 located on the other side of the tab connection portion 21; the insert blocks 222 and slots 223 corresponding to two adjacent connection pieces 2 are plugged in with each other. Adjacent connection pieces 2 are plugged in with the insert blocks 222 and slots 223, further ensuring that a plurality of connection pieces 2 can be aligned.

[0049] It is worth mentioning that please refer to Figure 2In this embodiment, the left side of the abutting portion 22 located on the left side of the tab connecting portion 21 has an insert block 222 and a slot 223, and correspondingly, the right side wall of the abutting portion 22 located on the right side of the tab connecting portion 21 also has an insert block 222 and a slot 223, and the insert block 222 located on the left side corresponds to the slot 223 located on the right side, and the slot 223 located on the left side corresponds to the insert block 222 located on the right side. For further information, please refer to Figure 4 For two adjacent connecting pieces 2, the plug block 222 on the right side of the connecting piece 2 on the left side is plugged into the slot 223 on the left side of the connecting piece 2 on the right side, and the slot 223 on the right side of the connecting piece 2 on the left side is plugged into the plug block 222 on the left side of the connecting piece 2 on the right side.

[0050] Of course, in other alternative embodiments, the side of the abutting portion 22 away from the tab connection portion 21 may only have an insert block 222 or a slot 223. Specifically, the side of the abutting portion 22 located on one side of the tab connection portion 21 forms the insert block 222, and correspondingly, the side of the abutting portion 22 located on the other side of the tab connection portion 21 forms the slot 223.

[0051] It should be noted that, through the weight distribution design of the connecting piece 2, the design of the slope structure 221, and the structural design of the plug block 222 and the slot 223, the autonomous leveling, alignment and splicing of several connecting pieces 2 during the vibration process can be achieved.

[0052] It is worth noting that the cover plate includes a lead-out component, such as a pole, and the connecting piece 2 is welded to the lead-out component.

[0053] According to an embodiment of the present invention, on the other hand, a battery manufacturing method is also provided, comprising the steps of:

[0054] The two pole cores 1 are arranged side by side and symmetrically, and the pole ears 11 of the two pole cores 1 are welded to the same connecting sheet 2 to form a minimum repeating unit 10;

[0055] Arrange and dispose a plurality of pole cores 1 of the minimum repeating units 10 to form a battery core, and arrange and dispose a plurality of connecting sheets 2 so that the edges of adjacent connecting sheets 2 abut against each other;

[0056] Connecting a plurality of connecting pieces 2 by welding, and welding the connecting pieces 2 to the cover plate;

[0057] Install the battery cell into the shell so that the cover plate seals the shell.

[0058] Two symmetrically arranged pole cores 1 and a connecting sheet 2 are welded to form a minimum repeating unit 10, and then several minimum repeating units 10 are combined to form a battery cell to meet the large capacity requirements of the battery; moreover, the pole cores 1 in the several minimum repeating units 10 have the same structure and can be manufactured using the same equipment and processing procedures. The processing process is simple, achieving the unity of equipment, consistency of processing and uniformity of products, thereby reducing manufacturing costs and management costs.

[0059] In one embodiment, the tab 11 and the connecting sheet 2 are welded by ultrasonic welding or laser welding.

[0060] In one embodiment, a plurality of pole cores 1 of the minimum repeating units 10 are arranged to form a battery cell, and a plurality of connecting sheets 2 are arranged so that the edges of adjacent connecting sheets 2 abut against each other, including the steps of:

[0061] Aligning the pole cores 1 of a plurality of minimum repeating units 10 by means of a positioning tool;

[0062] A plurality of minimum repeating units 10 are driven to vibrate by a vibration device, and the amplitude direction of the vibration device is set along the arrangement direction of the plurality of connecting plates 2, so that the edges of adjacent connecting plates 2 abut against each other and the plurality of connecting plates 2 are aligned; a clamping tool is used to clamp and fix the arranged plurality of connecting plates 2.

[0063] Therefore, by means of vibration, the plurality of connecting sheets 2 are made to be uniform during the vibration process, so that the plurality of connecting sheets 2 are evenly arranged.

[0064] It is worth noting that when several minimum repeating units 10 are arranged, the pole core 1 can be placed flat, upright or inverted. The pole cores 1 of several minimum repeating units 10 may be misaligned to a certain extent. Therefore, a positioning tool is used to align the pole cores 1 of several repeating units. However, after the pole cores 1 of several minimum repeating units 10 are aligned, the connecting pieces 2 of several minimum repeating units 10 may not be aligned. Therefore, in this embodiment, a vibration device is used to drive several connecting pieces 2 to vibrate uniformly so that several connecting pieces 2 tend to be aligned.

[0065] It should be noted that after the vibration is completed, several connecting sheets 2 are arranged flat, and at this time, adjacent connecting sheets 2 are in contact with each other and are not fixed. Therefore, a clamping tool is used to clamp and fix a row of connecting sheets 2 to ensure that several connecting sheets 2 are in an aligned state, and then several connecting sheets 2 can be welded and welded to the cover plate.

[0066] In one embodiment, when the vibration device drives the plurality of minimum repeating units 10 to vibrate, the plurality of minimum repeating units 10 are inverted with the pole core 1 on top and the connecting piece 2 on the bottom. In the vibration process, the plurality of minimum repeating units 10 are inverted, which is more conducive to the plurality of connecting pieces 2 being uniform under the combined action of vibration and self-gravity, and the inverted state facilitates the subsequent welding of the plurality of connecting pieces 2 and the cover plate.

[0067] It is worth noting that the parameters of the vibration applied to the plurality of minimum repeating units 10 are set to a vibration section running length of 10 cm to 50 cm, a vibration frequency of 1 Hz to 10 Hz, and an amplitude of 0.5 mm to 2.0 mm.

[0068] In one embodiment, Figure 1 and Figure 2 As shown, the connecting piece 2 includes a tab connecting portion 21 and an abutting portion 22. The tab connecting portion 21 is welded to the tab 11, and the weight of the tab connecting portion 21 is m1; the abutting portion 22 is connected to the tab connecting portion 21, and the abutting portion 22 is arranged on two opposite sides of the tab connecting portion 21, and adjacent connecting pieces 2 are abutted by the abutting portion 22, and the weight of the abutting portion 22 is m2, satisfying m1>m2.

[0069] The weight of the connecting sheet 2 is concentrated at the pole lug connection portion 21, so that the connecting sheet 2 can be connected to the pole lug 11 as a reference point. During the vibration process, the connecting sheet 2 can be evenly arranged by taking advantage of the concentrated weight of the connecting sheet 2.

[0070] Specifically, in one embodiment, the weight m1 of the tab connection portion 21 and the weight m2 of the abutting portion 22 satisfy 3≤m1 / m2≤6. Preferably, 4≤m1 / m2≤5.

[0071] In one embodiment, Figure 1 As shown, the tab connection portion 21 includes a base sheet 211 and a thickened sheet 212, the base sheet 211 and the thickened sheet 212 are stacked, the abutment portion 22 is connected to the base sheet 211, and the thickened sheet 212 is welded to the tab 11. By adding the thickened sheet 212 to the base sheet 211, the weight of the tab connection portion 21 is increased, the weight ratio of the tab connection portion 21 and the abutment portion 22 is controlled, and the positioning connection of the tab 11 and the thickened sheet 212 is facilitated.

[0072] It is worth mentioning that please refer to Figure 1 The base sheet 211 and the abutting portion 22 are arranged with equal thickness and are located in the same horizontal plane, and the thickening sheet 212 is arranged on a side of the base sheet 211 facing the pole core 1 .

[0073] In one embodiment, Figure 1 and Figure 2As shown, a slope structure 221 is formed on the side of the abutting portion 22 away from the tab connection portion 21, and the slope structures 221 of the abutting portion 22 located on both sides of the tab connection portion 21 have the same inclination direction; the two slope structures 221 corresponding to two adjacent connecting pieces 2 are adapted to be connected. By forming the slope structure 221 on the side of the abutting portion 22, it is convenient for adjacent connecting pieces 2 to cooperate and abut, and the flatness of the splicing of adjacent connecting pieces 2 is improved.

[0074] In one embodiment, see Figure 1 and Figure 2 The side of the abutment portion 22 away from the tab connection portion 21 has an insert block 222 and / or a slot 223, and the insert block 222 of the abutment portion 22 located on one side of the tab connection portion 21 is correspondingly arranged with the slot 223 of the abutment portion 22 located on the other side of the tab connection portion 21; the insert blocks 222 and slots 223 corresponding to two adjacent connection pieces 2 are plugged in with each other. Adjacent connection pieces 2 are plugged in with the insert blocks 222 and slots 223, further ensuring that a plurality of connection pieces 2 can be aligned.

[0075] It should be noted that, through the weight distribution design of the connecting piece 2, the design of the slope structure 221, and the structural design of the plug block 222 and the slot 223, the autonomous leveling, alignment and splicing of several connecting pieces 2 during the vibration process can be achieved.

[0076] In one embodiment, a plurality of connecting sheets 2 are connected by welding, and the connecting sheets 2 are welded to the cover plate at the same time, including the steps of:

[0077] At the connecting position of the two slope structures 221 of two adjacent connecting sheets 2, the two connecting sheets 2 are welded and simultaneously welded to the cover plate;

[0078] The plurality of connection sheets 2 are welded along their arrangement direction, the welding positions correspond to the plugging positions of the plug block 222 and the slot 223 , and are welded to the cover plate at the same time.

[0079] Welding is performed at the position where the two slope structures 221 cooperate to prevent assembly gaps between adjacent connecting pieces 2 from causing leakage of laser beams and insufficient filling of molten welding materials, thereby ensuring welding strength and guide area; directly weld several connecting pieces 2 along the arrangement direction of the several connecting pieces 2, and make adjacent connecting pieces 2 correspondingly welded at the plug-in position, and the welding method is simple and easy to operate; when connecting several connecting pieces 2 by welding, the welding process can also simultaneously connect several connecting pieces 2 to the cover plate, thereby simplifying the welding process and facilitating welding operations in narrow welding space conditions.

[0080] It is worth mentioning that please refer to Figure 5The welding mark 3 for welding the joint positions of the two slope structures 221 of two adjacent connecting plates 2, and the welding mark 3 for welding along the arrangement direction of several connecting plates 2, are both linear, that is, the welding equipment welds along a simple straight line trajectory, which is easy to operate and reduces the welding operation space.

[0081] It should be further explained that in the related art, laser penetration welding is used to connect the connecting piece 2 and the cover plate. In this embodiment, when welding the joints of the two slope structures 221 of two adjacent connecting pieces 2, a combination of lap welding and penetration welding is used, which avoids the risks of false welding, desoldering and small lap guide area, reduces the energy required for welding, and saves resources.

[0082] It should be noted that, through the design of the slope structure 221 of the connecting piece 2 and the structural design of the insert block 222 and the slot 223, the positioning, plugging and welding effects of adjacent connecting pieces 2 are fully guaranteed.

[0083] It is understandable that the battery manufacturing process also includes insulation testing, airtightness testing and other steps to test whether the battery meets the usage requirements.

[0084] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: A minimum repeating unit (10) comprises two pole cores (1) arranged side by side and symmetrically, the pole ears (11) of the two pole cores (1) being welded to the same connecting piece (2), the minimum repeating unit (10) being provided with a plurality of pole cores (1) of the plurality of minimum repeating units (10) being arranged to form a battery cell, the connecting pieces (2) of the plurality of minimum repeating units (10) being arranged in an arranged manner, the edges of adjacent connecting pieces (2) being in contact with each other, and the plurality of connecting pieces (2) being connected and arranged; A cover plate connected to a plurality of the connecting pieces (2); A shell, the battery cell is arranged in the shell, and the cover plate blocks the opening of the shell and is connected to the shell; The connecting piece (2) comprises: A pole lug connection portion (21) is welded to the pole lug (11), and the weight of the pole lug connection portion (21) is m1; an abutment portion (22) connected to the pole lug connection portion (21), the abutment portion (22) being arranged on two opposite sides of the pole lug connection portion (21), adjacent connecting sheets (2) being abutted against each other via the abutment portion (22), the weight of the abutment portion (22) being m2, satisfying m1>m2; The pole lug connecting portion (21) comprises a base sheet (211) and a thickened sheet (212); the base sheet (211) and the thickened sheet (212) are stacked; the abutting portion (22) is connected to the base sheet (211); the thickened sheet (212) is welded to the pole lug (11); the base sheet and the abutting portion are arranged with equal thickness and are located in the same horizontal plane; and the thickened sheet is arranged on a side of the base sheet facing the pole core.

2. The battery according to claim 1, characterized in that The weight m1 of the tab connection portion (21) and the weight m2 of the contact portion (22) satisfy 3≤m1 / m2≤6.

3. The battery according to claim 1 or 2, characterized in that: A slope structure (221) is formed on the side of the abutting portion (22) away from the pole lug connecting portion (21); the slope structures (221) of the abutting portion (22) located on both sides of the pole lug connecting portion (21) have the same inclination direction; and the two slope structures (221) corresponding to two adjacent connecting sheets (2) are adapted to be connected.

4. The battery according to claim 3, characterized in that The side of the abutment portion (22) away from the pole lug connection portion (21) has an insert block (222) and / or a slot (223); the insert block (222) of the abutment portion (22) located on one side of the pole lug connection portion (21) and the slot (223) of the abutment portion (22) located on the other side of the pole lug connection portion (21) are arranged correspondingly; the insert blocks (222) and slots (223) corresponding to two adjacent connection sheets (2) are arranged to be plugged into each other.

5. A battery manufacturing method, characterized in that: Includes steps: The two pole cores (1) are arranged side by side and symmetrically, and the pole ears (11) of the two pole cores (1) are welded to the same connecting sheet (2) to form a minimum repeating unit (10); Arrange and arrange a plurality of pole cores (1) of the minimum repeating units (10) to form a battery core, and arrange and arrange a plurality of connecting sheets (2), with the edges of adjacent connecting sheets (2) abutting against each other; Connecting a plurality of connecting pieces (2) by welding, and welding the connecting piece (2) to the cover plate; Install the battery cell into the shell so that the cover plate seals the shell; Wherein, the connecting piece (2) comprises: A pole lug connection portion (21) is welded to the pole lug (11), and the weight of the pole lug connection portion (21) is m1; an abutment portion (22) connected to the pole lug connection portion (21), the abutment portion (22) being arranged on two opposite sides of the pole lug connection portion (21), adjacent connecting sheets (2) being abutted against each other via the abutment portion (22), the weight of the abutment portion (22) being m2, satisfying m1>m2; The pole lug connecting portion (21) comprises a base sheet (211) and a thickened sheet (212); the base sheet (211) and the thickened sheet (212) are stacked; the abutting portion (22) is connected to the base sheet (211); the thickened sheet (212) is welded to the pole lug (11); the base sheet and the abutting portion are arranged with equal thickness and are located in the same horizontal plane; and the thickened sheet is arranged on a side of the base sheet facing the pole core.

6. The battery manufacturing method according to claim 5, characterized in that: The method of arranging a plurality of pole cores (1) of the minimum repeating units (10) to form a battery core, and arranging a plurality of connecting sheets (2) so that the edges of adjacent connecting sheets (2) abut against each other, comprises the steps of: Aligning the pole cores (1) of a plurality of minimum repeating units (10) by means of a positioning tool; A plurality of minimum repeating units (10) are driven to vibrate by a vibration device, wherein the amplitude direction of the vibration device is arranged along the arrangement direction of the plurality of connecting sheets (2), so that the edges of adjacent connecting sheets (2) abut against each other and the plurality of connecting sheets (2) are arranged in an aligned manner; A clamping tool is used to clamp and fix the arranged connecting pieces (2).

7. The battery manufacturing method according to claim 6, characterized in that: When the vibration device drives the plurality of minimum repeating units (10) to vibrate, the plurality of minimum repeating units (10) are arranged in an inverted manner with the pole core (1) on top and the connecting sheet (2) on the bottom.

8. The battery manufacturing method according to claim 5, characterized in that: The method of connecting a plurality of connecting pieces (2) by welding and welding the connecting piece (2) to the cover plate comprises the following steps: At the connecting position of the two slope structures (221) of two adjacent connecting sheets (2), the two connecting sheets (2) are welded and simultaneously welded to the cover plate; and / or, The plurality of connection sheets (2) are welded along the arrangement direction of the plurality of connection sheets (2), the welding positions corresponding to the plugging positions of the plug block (222) and the slot (223), and are welded to the cover plate at the same time.

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