Battery cell, battery and battery manufacturing method

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cell, a battery and a battery manufacturing method.The battery cell comprises a diaphragm, a negative plate and a positive plate, and the diaphragm is continuously bent to form a first containing groove and a second containing groove which are arranged in a staggered mode; the negative plates are continuously bent and penetrate through the first accommodating groove in a staggered manner; the positive plate is arranged in the second accommodating groove, and the adjacent positive plate and negative plate are separated by a diaphragm. Therefore, by bending the negative plate and the diaphragm, only the positive plate is cut into a plurality of parts, so that the cutting times of the pole group can be reduced, the section inside the pole group is reduced, the production process is simplified, the defects of burrs, bending, dust and the like are reduced, the positive plate and the negative plate can be separated by the diaphragm, and the safety and the stability of the pole group are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cell, a battery and a battery manufacturing method. Background Art

[0002] A battery is a device that converts chemical energy into electrical energy. As one of the most common batteries, lithium batteries are lightweight and highly efficient, so they are widely used in portable electronic devices, power tools, electric vehicles and other fields.

[0003] The battery includes a shell and a battery cell. The battery cell is arranged inside the shell. The battery cell includes a pole group. There are two ways to assemble the lithium battery pole group, namely winding and stacking. The stacking methods of the stacked batteries are divided into a layered type that requires cutting the diaphragm and a folding type that does not require cutting the diaphragm. In the stacked batteries, the positive and negative pole sheets are alternately arranged, and the diaphragms are respectively arranged between adjacent positive pole sheets and negative pole sheets. Compared with wound batteries, stacked batteries have higher space utilization, more uniform stress distribution, and higher safety and stability.

[0004] See also Figure 1 The existing lamination process requires the positive electrode sheet 3 and the negative electrode sheet 2 to be cut and stacked between the folded separator 1. The electrode sheet needs to be cut several times, so that the electrode group has more cross-sections. The pole ear is usually formed by cutting in the blank area of ​​the pole sheet. The pole ear is prone to defects such as bending, burrs, and dust residue during the assembly of the electrode group, which affects the quality of the electrode group and the safety of the battery. The size of the pole ear is related to the internal resistance. The internal resistance of the pole ear with a smaller area is larger, which limits the battery rate performance. Summary of the invention

[0005] The object of the present invention is to provide a battery cell, a battery and a battery manufacturing method to solve the problems of more cross sections produced by cutting during the assembly of the electrode group of the laminated battery, easy bending burrs on the electrode ears and large internal resistance.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, a battery cell comprises: a diaphragm, the diaphragm is continuously bent to form a first receiving groove and a second receiving groove which are staggered; a negative electrode sheet, the negative electrode sheet is continuously bent and arranged, and the negative electrode sheet is staggered through the first receiving groove; a positive electrode sheet, the positive electrode sheet is arranged in the second receiving groove, and the adjacent positive electrode sheets and negative electrode sheets are separated by the diaphragm.

[0008] Preferably, a plurality of positive electrode sheets are provided, and the positive electrode sheets and the second containing grooves are arranged in a one-to-one correspondence.

[0009] Preferably, the negative electrode sheet is provided with a negative electrode coating area and a negative electrode blank area, the negative electrode coating area is at least partially located in the first receiving groove, and the negative electrode blank area is at least partially located outside the first receiving groove; the positive electrode sheet is provided with a positive electrode coating area and a positive electrode blank area, the positive electrode coating area is at least partially located in the second receiving groove, and the positive electrode blank area is at least partially located outside the second receiving groove.

[0010] Preferably, the bending part of one side of the negative electrode sheet is arranged inside the negative electrode blank area, so that when the negative electrode sheet is bent, the connection between the negative electrode blank area and the negative electrode coating area is located on both sides of the bending part of one side of the negative electrode sheet.

[0011] Preferably, the positive electrode blank area is arranged toward one side of the separator; and / or the negative electrode blank area is arranged toward one side of the separator.

[0012] Preferably, the positive electrode blank area and the negative electrode blank area are respectively orthogonally arranged on two adjacent sides of the separator.

[0013] Preferably, the cross-sectional area of ​​the first containing groove is not less than the cross-sectional area of ​​the negative electrode coating region, and the cross-sectional area of ​​the second containing groove is not less than the cross-sectional area of ​​the positive electrode coating region.

[0014] In a second aspect, a battery comprises a shell, a cover, and the battery cell as described above, wherein the battery cell is arranged inside the shell, and the cover is connected to the shell.

[0015] Preferably, the positive electrode sheet is provided with a positive electrode blank area, the positive electrode blank area forms a positive electrode ear, the negative electrode sheet is provided with a negative electrode blank area, the negative electrode blank area forms a negative electrode ear, and the cover body is provided with a positive electrode connecting sheet and a negative electrode connecting sheet, the positive electrode ear is electrically connected to the positive electrode connecting sheet, and the negative electrode ear is electrically connected to the negative electrode connecting sheet.

[0016] In a third aspect, a battery manufacturing method is provided for manufacturing the battery as described above, comprising the following steps:

[0017] S100, manufacturing positive electrode sheets and negative electrode sheets, reserving positive electrode blank areas and negative electrode blank areas respectively, and coating the positive electrode coating areas and negative electrode coating areas;

[0018] S200, continuously bending the diaphragm to form a first accommodating groove and a second accommodating groove that are alternately arranged;

[0019] S300, continuously bending the negative electrode sheets, inserting the negative electrode sheets into the first receiving grooves in a staggered manner, and making the negative electrode blank area outside the first receiving grooves to form negative electrode ears;

[0020] S400, inserting the positive electrode sheet into the second receiving groove correspondingly, and making the positive electrode blank area outside the second receiving groove, so as to form a positive electrode ear;

[0021] S500, assemble the battery cell into the housing, and weld the positive electrode ear to the positive electrode connecting piece, and weld the negative electrode ear to the negative electrode connecting piece.

[0022] Beneficial effects of the present invention:

[0023] A battery cell includes a diaphragm, a negative electrode sheet and a positive electrode sheet. The diaphragm is continuously bent to form a first receiving groove and a second receiving groove that are staggered. The negative electrode sheet is continuously bent and staggered through the first receiving groove. The positive electrode sheet is arranged in the second receiving groove, and adjacent positive and negative electrode sheets are separated by a diaphragm.

[0024] In this way, only the positive electrode sheet is cut into multiple pieces, and the negative electrode sheet and the separator are continuously bent and arranged, so that the electrode group can be assembled while reducing the number of cutting times, and the end surface inside the electrode group can be reduced, thereby reducing defects such as burrs, bends, and dust residues caused by cutting, improving the processing quality and assembly efficiency of the electrode group, and ensuring that the positive electrode sheet and the negative electrode sheet are separated by the separator to avoid short circuits and other phenomena, thereby improving the safety and stability of the electrode group and the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram intended to show the assembly method of laminated battery cells in the prior art;

[0026] Figure 2 is a schematic diagram of the structure of a battery cell in one embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the battery cell when assembled in one embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of the structure of the battery after assembly in one embodiment of the present invention;

[0029] Figure 5 is a side view of an assembled battery cell in one embodiment of the present invention;

[0030] Figure 6 FIG. 1 is a manufacturing flow chart of a battery in one embodiment of the present invention.

[0031] In the figure:

[0032] 1. Diaphragm; 11. First containing groove; 12. Second containing groove; 2. Negative electrode sheet; 21. Negative electrode coating area; 22. Negative electrode blank area; 23. Bending point; 3. Positive electrode sheet; 31. Positive electrode coating area; 32. Positive electrode blank area. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] First, see Figure 2 The present invention provides a battery cell, including a diaphragm 1, a negative electrode sheet 2 and a positive electrode sheet 3. The diaphragm 1 is continuously bent to form a first accommodating groove 11 and a second accommodating groove 12 which are arranged alternately; the negative electrode sheet 2 is continuously bent and arranged, and the negative electrode sheet 2 is arranged alternately through the first accommodating groove 11; the positive electrode sheet 3 is arranged in the second accommodating groove 12, and the adjacent positive electrode sheets 3 and negative electrode sheets 2 are separated by the diaphragm 1, that is, the positive electrode sheet 3, the diaphragm 1, and the negative electrode sheet 2 are arranged in sequence.

[0038] In this embodiment, the diaphragm 1 and the negative electrode sheet 2 are respectively provided with one, and the diaphragm 1 after continuous bending includes a plurality of first receiving grooves 11 and second receiving grooves 12, and the first receiving grooves 11 and the second receiving grooves 12 are respectively arranged on both sides of the diaphragm 1, and the negative electrode sheet 2 is continuously bent and passes through the plurality of first receiving grooves 11 in sequence, so that the portion of the negative electrode sheet 2 located in the first receiving groove 11 abuts against the diaphragm 1.

[0039] It should be noted that since the first receiving groove 11 and the second receiving groove 12 are staggered, the positive electrode sheet 3 and the negative electrode sheet 2 are also staggered, and the negative electrode sheet 2 located in the first receiving groove 11 and the positive electrode sheet 3 located in the second receiving groove 12 are both single-layer electrode sheets.

[0040] In this way, by continuously bending the separator 1 and the negative electrode sheet 2, the number of cutting times of the separator 1 and the negative electrode sheet 2 can be reduced, the cross-section inside the electrode group can be reduced, and defects such as burrs, bends, and dust residue can be reduced. At the same time, the production process is simplified, which is convenient for workers to assemble, improves the quality of the electrode group and the efficiency of electrode group assembly, and improves the space utilization and the safety and stability of the electrode group.

[0041] See also Figure 2 In some embodiments, a plurality of positive electrode sheets 3 are provided, and the positive electrode sheets 3 are provided in one-to-one correspondence with the second containing grooves 12. Among them, there are four first containing grooves 11 and four second containing grooves 12, and four positive electrode sheets 3 are provided. The negative electrode sheets 2 pass through the four first containing grooves 11 in sequence and abut against the diaphragm 1.

[0042] In this way, only the positive electrode sheet 3 is cut into multiple pieces, which can reduce the number of times the electrode group is cut, improve production efficiency, simplify the production process, reduce the cross-section inside the electrode group, and reduce defects such as burrs, bends, and dust residues. At the same time, it can ensure that the positive electrode sheet 3 and the negative electrode sheet 2 are separated by the separator 1 and stably connected to the external circuit, thereby improving the safety and stability of the electrode group.

[0043] It can be understood that the number of the first receiving grooves 11 and the second receiving grooves 12 can be flexibly adjusted according to actual needs and is not limited to four, and this embodiment does not limit this.

[0044] See also Figure 2 and Figure 3 In some embodiments, the negative electrode sheet 2 is provided with a negative electrode coating area 21 and a negative electrode blank area 22, the negative electrode coating area 21 is at least partially located in the first receiving groove 11, and the negative electrode blank area 22 is at least partially located outside the first receiving groove 11, and the positive electrode sheet 3 is provided with a positive electrode coating area 31 and a positive electrode blank area 32, the positive electrode coating area 31 is at least partially located in the second receiving groove 12, and the positive electrode blank area 32 is at least partially located outside the second receiving groove 12.

[0045] In this embodiment, when the negative electrode sheet 2 is continuously bent, the bending point 23 of the negative electrode sheet 2 coincides with the axis of the negative electrode blank area 22, that is, the bending point 23 of the negative electrode sheet 2 is located in the middle of the negative electrode blank area 22, so that the areas of the negative electrode blank areas 22 on both sides of the bending point 23 are the same; the positive electrode blank area 32 is arranged on one side of the positive electrode sheet 3 and is arranged toward the outside of the second accommodating groove 12.

[0046] It should be noted that the two sides with the largest area of ​​the positive electrode sheet 3 are both provided with corresponding positive electrode coating areas 31 and positive electrode blank areas 32, and the two sides with the largest area of ​​the negative electrode sheet 2 are both provided with corresponding negative electrode coating areas 21 and negative electrode blank areas 22. The positive electrode coating areas 31 and the negative electrode coating areas 21 are both coated with electrode slurry. The positive electrode blank areas 32 of multiple positive electrode sheets 3 can be fixedly connected to form a full-ear structure, thereby shortening the electron flow path to achieve electrical connection between the positive electrode blank area 32 and the external circuit. Similarly, the negative electrode blank areas 22 of multiple negative electrode sheets 2 can also be fixedly connected to form a full-ear structure to achieve electrical connection between the negative electrode blank area 22 and the external circuit.

[0047] In this way, the negative electrode blank area 22 and the positive electrode blank area 32 can be respectively used as negative electrode ears and positive electrode ears for connection with the outside. Compared with the cut-out ears with smaller areas, the negative electrode blank area 22 and the positive electrode blank area 32 are directly used as ears, which increases the conductive area, can reduce the internal resistance, avoid the heating of the battery cell due to excessive internal resistance, improve the battery rate performance, and meet the high-power operation requirements; by bending at the negative electrode blank area 22, the number of cutting times of the negative electrode sheet 2 can be reduced, the defects of burrs, dust residue, and bending can be reduced, the safety and stability of the battery cell can be improved, and the production efficiency can be improved, and the production steps can be simplified.

[0048] See also Figure 4 and Figure 5 In some embodiments, the bending portion 23 on one side of the negative electrode sheet 2 is arranged inside the negative electrode blank area 22, so that when the negative electrode sheet 2 is bent, the connection between the negative electrode blank area 22 and the negative electrode coating area 21 is located on both sides of the bending portion 23 on one side of the negative electrode sheet 2.

[0049] In this embodiment, when the negative electrode sheet 2 is bent and connected to the diaphragm 1, the negative electrode blank area 22 is located outside the first accommodating groove 11, so that the negative electrode blank area 22 can be connected to the external circuit as a negative electrode ear to stably transmit current. At the same time, since the negative electrode blank areas 22 of multiple negative electrode sheets 2 can be connected to form a full-ear structure, the electron flow path can be shortened, the internal resistance of the battery cell can be reduced, and the battery cell can be prevented from heating due to high internal resistance, thereby improving the battery rate performance and meeting high-power operation requirements.

[0050] It can be understood that the bending point 23 of the negative electrode sheet 2 may not be located in the middle of the negative electrode blank area 22, that is, the widths of the negative electrode blank areas 22 on both sides of the bending point 23 of the negative electrode sheet 2 may not be equal. In this embodiment, the bending point 23 of the negative electrode sheet 2 is located in the middle of the negative electrode blank area 22, which can facilitate the fixed connection of multiple negative electrode blank areas 22 to form a full-ear structure.

[0051] See also Figure 4 In some embodiments, the positive electrode blank areas 32 are all arranged toward one side of the diaphragm 1, and the negative electrode blank areas 22 are all arranged toward the other side of the diaphragm 1, that is, multiple positive electrode blank areas 32 are all arranged on the same side of the diaphragm 1, and multiple negative electrode blank areas 22 are all arranged on the same side of the diaphragm 1.

[0052] In the present embodiment, the widths of the positive electrode blank areas 32 of the plurality of positive electrode sheets 3 are the same, and the widths of the positive electrode blank areas 32 are smaller than the widths of the positive electrode coating areas 31. When the positive electrode sheet 3 is located in the second accommodating groove 12, the positive electrode blank areas 32 are all located outside the second accommodating groove 12. The bending part 23 on one side of the negative electrode sheet 2 abuts against the diaphragm 1, and the bending part 23 on the other side extends toward the outside of the first accommodating groove 11 and is located in the negative electrode blank area 22 to form a negative electrode ear. That is, the width of the positive electrode blank area 32 is the width of the positive electrode ear, and the distance between the bending part 23 of the negative electrode sheet 2 and the edge of the negative electrode blank area 22 is the width of the negative electrode ear.

[0053] In this way, multiple positive electrode blank areas 32 can be fixedly connected to form a full pole ear structure, so that the positive electrode blank area 32 can be connected to the external circuit as a positive pole ear. Negative electrode blank areas 22 are arranged on both sides of the bend 23 on one side of the negative electrode sheet 2, which can save the process of cutting and processing the pole ears, improve the efficiency and quality of pole group assembly, shorten the electron flow path, reduce the internal resistance of the battery cell and avoid the heating of the battery cell due to high internal resistance, thereby improving the battery rate performance.

[0054] It is understandable that the widths of the positive electrode blank area 32 and the negative electrode blank area 22 can be adjusted according to actual needs, and this embodiment does not limit this.

[0055] See also Figure 4 In some embodiments, the positive electrode blank area 32 and the negative electrode blank area 22 are orthogonally arranged on two adjacent sides of the separator 1. In this embodiment, the opening direction of the first accommodating groove 11 is opposite to the opening direction of the second accommodating groove 12, and the length direction of the positive electrode blank area 32 is perpendicular to the length direction of the negative electrode blank area 22.

[0056] In this way, the positive electrode blank area 32 and the negative electrode blank area 22 are arranged on two adjacent sides of the separator 1, which can make the battery cell structure more compact, and connect the positive electrode blank area 32 and the negative electrode blank area 22 to the external circuit respectively, ensuring stable transmission of current and improving assembly efficiency.

[0057] It can be understood that the positive electrode blank area 32 and the negative electrode blank area 22 can also be arranged on opposite sides of the diaphragm 1, that is, the length direction of the positive electrode blank area 32 is parallel to the length direction of the negative electrode blank area 22, and the arrangement of the positive electrode blank area 32 and the negative electrode blank area 22 can be flexibly adjusted according to actual needs, and is not limited to an orthogonal setting, and will not be listed in detail here.

[0058] See also Figure 3 In some embodiments, the cross-sectional area of ​​the first receiving groove 11 is not less than the cross-sectional area of ​​the negative electrode coating area 21, and the cross-sectional area of ​​the second receiving groove 12 is not less than the cross-sectional area of ​​the positive electrode coating area 31. In this embodiment, the cross-sectional area of ​​the first receiving groove 11 is larger than the cross-sectional area of ​​the negative electrode coating area 21, and the connection between the negative electrode coating area 21 and the negative electrode blank area 22 is flush with the side of the first receiving groove 11, and the cross-sectional area of ​​the second receiving groove 12 is larger than the cross-sectional area of ​​the positive electrode coating area 31, and the connection between the positive electrode coating area 31 and the positive electrode blank area 32 is flush with the side of the second receiving groove 12.

[0059] In this way, the diaphragm 1 can protect the positive electrode coating area 31 and the negative electrode coating area 21, and expose the positive electrode blank area 32 and the negative electrode blank area 22 to the diaphragm 1, so as to facilitate connection with the external circuit, and the negative electrode coating area 21 and the positive electrode coating area 31 are separated by the diaphragm 1, thereby improving the safety and stability of the battery cell, and at the same time facilitating the assembly of the negative electrode sheet 2 and the positive electrode sheet 3 into the first accommodating groove 11 and the second accommodating groove 12.

[0060] It can be understood that the cross-sectional area of ​​the first accommodating groove 11 may also be equal to the cross-sectional area of ​​the negative electrode coating area 21, and the cross-sectional area of ​​the second accommodating groove 12 may also be equal to the cross-sectional area of ​​the positive electrode coating area 31. Part of the negative electrode coating area 21 may also be located outside the first accommodating groove 11, and part of the positive electrode coating area 31 may also be located outside the second accommodating groove 12. It is sufficient to prevent contact between the negative electrode coating area 21 and the positive electrode coating area 31, which will not be elaborated here.

[0061] In a second aspect, the present invention further provides a battery, comprising a housing (not shown in the figure), a cover (not shown in the figure) and a battery cell, wherein the battery cell is arranged inside the housing, and the cover is connected to the housing. The cover is fixedly connected to the housing, and the battery cell is arranged in a space enclosed by the housing and the cover and is fixedly connected to the housing.

[0062] In this way, by bending the negative electrode sheet 2 and the diaphragm 1 and inserting multiple positive electrode sheets 3 into the second accommodating groove 12, the number of cutting times during the electrode group processing can be reduced, the electrode group assembly efficiency can be improved, and defects such as burrs, bends, and dust residue can be reduced, thereby avoiding the defects of the electrode group affecting the normal operation of the battery cell, and improving the processing quality of the electrode group and the stability and safety of the battery cell; the positive electrode blank area 32 and the negative electrode blank area 22 respectively form a full-ear structure, which can reduce the internal resistance of the battery cell, improve the battery rate performance, and meet the high-power operation requirements.

[0063] See also Figure 4 In some embodiments, the positive electrode blank area 32 forms a positive electrode ear (not shown in the figure), the negative electrode blank area 22 forms a negative electrode ear (not shown in the figure), and the cover body is provided with a positive electrode connecting piece (not shown in the figure) and a negative electrode connecting piece (not shown in the figure), and the positive electrode ear is electrically connected to the positive electrode connecting piece, and the negative electrode ear is electrically connected to the negative electrode connecting piece. In this embodiment, the positive electrode ear and the positive electrode connecting piece, and the negative electrode ear and the negative electrode connecting piece are fixedly connected by welding, and the positive electrode connecting piece and the negative electrode connecting piece are fixedly connected to the cover body.

[0064] In this way, multiple positive electrode blank areas 32 are electrically connected, and multiple negative electrode blank areas 22 are electrically connected to form full-ear structures respectively, which can shorten the electron flow path, reduce the internal resistance of the battery, reduce the heat generation of the battery, and improve the battery performance under high power. By electrically connecting the positive electrode connecting piece with the positive ear and the negative electrode connecting piece with the negative ear, stable current transmission can be achieved; and because the negative electrode sheet 2 and the diaphragm 1 are both bent, the number of cutting times of the electrode group can be reduced, and the cutting process of the positive ear and the negative ear as well as the welding process with the positive electrode sheet 3 and the negative electrode sheet 2 can be saved, thereby simplifying the production process, improving production efficiency, reducing defects such as burrs and dust formed due to a large number of cutting sections, and defects such as bending formed when the ear is assembled to the electrode sheet, thereby improving the safety and stability of the battery.

[0065] It can be understood that the setting positions of the positive electrode connecting sheet and the negative electrode connecting sheet on the cover body can be adjusted according to the positions of the positive electrode blank area 32 and the negative electrode blank area 22, so that the positive electrode blank area 32 can be electrically connected to the positive electrode connecting sheet, and the negative electrode blank area 22 can be electrically connected to the negative electrode connecting sheet, so that the current generated inside the battery can be stably transmitted to the outside through the positive electrode connecting sheet and the negative electrode connecting sheet. No more examples are listed here.

[0066] Thirdly, see Figure 6 The present invention also provides a battery manufacturing method for manufacturing a battery, comprising the following steps:

[0067] S100, manufacturing the positive electrode sheet 3 and the negative electrode sheet 2, reserving the positive electrode blank area 32 and the negative electrode blank area 22 respectively, and coating the positive electrode coating area 31 and the negative electrode coating area 21;

[0068] S200, continuously bending the diaphragm 1, so that the bent diaphragm 1 forms a first receiving groove 11 and a second receiving groove 12 which are alternately arranged;

[0069] S300, continuously bending the negative electrode sheets 2, inserting the negative electrode sheets 2 into the first receiving grooves 11 in a staggered manner, and making the negative electrode blank area 22 outside the first receiving grooves 11, so as to form negative electrode ears;

[0070] S400, inserting the positive electrode sheet 3 into the second receiving groove 12 accordingly, and making the positive electrode blank area 32 located outside the second receiving groove 12, so as to form a positive electrode ear;

[0071] S500, assemble the battery cell into the housing, and weld the positive electrode ear to the positive electrode connecting piece, and weld the negative electrode ear to the negative electrode connecting piece.

[0072] In step S200 , the diaphragm 1 is bent at equal intervals, so that the bent diaphragm 1 is in a rectangular parallelepiped shape, and the width of the first receiving groove 11 is equal to the width of the second receiving groove 12 .

[0073] In step S300, the negative electrode sheet 2 is bent at equal intervals, the bending part 23 on one side of the negative electrode sheet 2 is arranged close to the diaphragm 1, and the bending part 23 on the other side is located in the negative electrode blank area 22 and extends in a direction away from the first accommodating groove 11. Multiple negative electrode blank areas 22 are fixedly connected to form a negative electrode ear.

[0074] In step S400 , the positive electrode sheets 3 are inserted into the second accommodating grooves 12 one by one, and a plurality of positive electrode blank areas 32 are fixedly connected to form positive electrode ears.

[0075] In step S500, the assembled battery cell is placed inside the shell, and after the positive electrode ear is connected to the positive electrode connecting piece and the negative electrode ear is connected to the negative electrode connecting piece, the cover plate and the shell are welded so that the cover plate and the shell can protect the battery cell and the current generated by the battery cell can be connected to the external circuit through the positive electrode connecting piece and the negative electrode connecting piece.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery cell, characterized in that: include: A diaphragm (1), wherein the diaphragm (1) is continuously bent to form a first containing groove (11) and a second containing groove (12) which are arranged alternately; A negative electrode sheet (2), wherein the negative electrode sheet (2) is continuously bent and arranged, and the negative electrode sheet (2) is arranged to pass through the first containing groove (11) in an alternating manner; A positive electrode sheet (3), wherein the positive electrode sheet (3) is arranged in the second containing groove (12), and adjacent positive electrode sheets (3) and negative electrode sheets (2) are separated by the diaphragm (1).

2. The battery cell according to claim 1, characterized in that: A plurality of positive electrode sheets (3) are provided, and the positive electrode sheets (3) and the second containing grooves (12) are provided in a one-to-one correspondence.

3. The battery cell according to claim 1, characterized in that: The negative electrode sheet (2) is provided with a negative electrode coating area (21) and a negative electrode blank area (22), wherein the negative electrode coating area (21) is at least partially located in the first receiving groove (11), and the negative electrode blank area (22) is at least partially located outside the first receiving groove (11); the positive electrode sheet (3) is provided with a positive electrode coating area (31) and a positive electrode blank area (32), wherein the positive electrode coating area (31) is at least partially located in the second receiving groove (12), and the positive electrode blank area (32) is at least partially located outside the second receiving groove (12).

4. The battery cell according to claim 3, characterized in that: The bending part (23) on one side of the negative electrode sheet (2) is arranged inside the negative electrode blank area (22), so that when the negative electrode sheet (2) is bent, the connection between the negative electrode blank area (22) and the negative electrode coating area (21) is located on both sides of the bending part (23) on one side of the negative electrode sheet (2).

5. The battery cell according to claim 3, characterized in that: The positive electrode blank area (32) is arranged toward one side of the separator (1); and / or the negative electrode blank area (22) is arranged toward one side of the separator (1).

6. The battery cell according to claim 5, characterized in that: The positive electrode blank area (32) and the negative electrode blank area (22) are respectively arranged orthogonally on two adjacent sides of the separator (1).

7. The battery cell according to any one of claims 3 to 6, characterized in that: The cross-sectional area of ​​the first containing groove (11) is not less than the cross-sectional area of ​​the negative electrode coating area (21), and the cross-sectional area of ​​the second containing groove (12) is not less than the cross-sectional area of ​​the positive electrode coating area (31).

8. A battery, characterized in that: The invention comprises a shell, a cover and a battery cell as claimed in any one of claims 1 to 7, wherein the battery cell is arranged inside the shell, and the cover is connected to the shell.

9. The battery according to claim 8, characterized in that The positive electrode sheet (3) is provided with a positive electrode blank area (32), and the positive electrode blank area (32) forms a positive electrode ear. The negative electrode sheet (2) is provided with a negative electrode blank area (22), and the negative electrode blank area (22) forms a negative electrode ear. The cover body is provided with a positive electrode connecting sheet and a negative electrode connecting sheet. The positive electrode ear is electrically connected to the positive electrode connecting sheet, and the negative electrode ear is electrically connected to the negative electrode connecting sheet.

10. A battery manufacturing method, characterized in that: For manufacturing the battery as claimed in any one of claims 8 to 9, comprising the following steps: S100, manufacturing a positive electrode sheet (3) and a negative electrode sheet (2), reserving a positive electrode blank area (32) and a negative electrode blank area (22) respectively, and coating the positive electrode coating area (31) and the negative electrode coating area (21); S200, continuously bending the diaphragm (1) so that the bent diaphragm (1) forms a first receiving groove (11) and a second receiving groove (12) that are alternately arranged; S300, continuously bending the negative electrode sheets (2), inserting the negative electrode sheets (2) into the first receiving grooves (11) in a staggered manner, and making the negative electrode blank area (22) located outside the first receiving grooves (11), so as to form negative electrode ears; S400, inserting the positive electrode sheet (3) into the second receiving groove (12) accordingly, and making the positive electrode blank area (32) located outside the second receiving groove (12), so as to form a positive electrode ear; S500, assemble the battery cell into the housing, and weld the positive electrode ear to the positive electrode connecting piece, and weld the negative electrode ear to the negative electrode connecting piece.

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