Battery manufacturing method, battery, battery module and battery pack

Abstract

The present invention relates to the field of battery technology and provides a battery manufacturing method, a battery, a battery module, and a battery pack. The battery manufacturing method comprises: providing an insulating film; laminating cells on the insulating film to form a laminated battery cell, wherein the laminated battery cell includes a diaphragm sheet different from the insulating film; and wrapping the laminated battery cell with the insulating film. By laminating cells on the insulating film to form a laminated battery cell, and then wrapping the laminated battery cell with the insulating film, the process of moving the laminated battery cell to the insulating film is eliminated, thereby improving battery manufacturing efficiency and avoiding the risk of foreign matter intrusion during transportation.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery manufacturing method, a battery, a battery module and a battery pack. Background Art

[0002] In conventional battery production processes, a single cell (hereafter referred to as a "bare cell") is typically produced before being coated with an insulating film. The bare cells are then transported to the insulating film site and coated with the film. This transport process carries the risk of foreign matter entering the cell, and the transport process also impacts production efficiency. Summary of the Invention

[0003] The present invention provides a battery manufacturing method, a battery, a battery module and a battery pack to improve battery manufacturing efficiency.

[0004] According to a first aspect of the present invention, there is provided a battery manufacturing method, comprising:

[0005] providing an insulating film;

[0006] Laminating on the insulating film to form a laminated battery core, the laminated battery core includes a diaphragm sheet different from the insulating film;

[0007] Wrap the laminated battery cells with insulating film.

[0008] The battery manufacturing method of an embodiment of the present invention forms a laminated battery cell by stacking batteries on an insulating film, and then wrapping the laminated battery cell with the insulating film, thereby eliminating the process of moving the laminated battery cell to the insulating film. This not only improves the manufacturing efficiency of the battery, but also avoids the risk of foreign matter mixing in during transportation.

[0009] According to a second aspect of the present invention, there is provided a battery comprising a battery obtained by the above-mentioned battery manufacturing method.

[0010] The battery of the embodiment of the present invention forms a laminated battery cell by stacking the batteries on an insulating film, and then wrapping the laminated battery cell with the insulating film, thereby eliminating the process of moving the laminated battery cell to the insulating film. This not only improves the manufacturing efficiency of the battery, but also avoids the risk of foreign matter mixing in during transportation.

[0011] According to a third aspect of the present invention, there is provided a battery comprising:

[0012] Insulating film;

[0013] A laminated battery cell, wherein the insulating film wraps the laminated battery cell, and the laminated battery cell comprises a first pole piece, a second pole piece, and a diaphragm, wherein the diaphragm is disposed between the first pole piece and the second pole piece;

[0014] Among them, the diaphragm includes a first end and a second end, the first end is the starting end when the diaphragm sheets are stacked, and the second end is the ending end when the diaphragm sheets are stacked. The laminated battery cell has a bottom surface, and the bottom surface is formed first when the laminated battery cell is stacked, and the second end does not contact the bottom surface.

[0015] The battery of an embodiment of the present invention includes an insulating film and a laminated battery cell. The insulating film wraps the laminated battery cell. By ensuring that the second end of the diaphragm sheet does not contact the bottom surface, it can be ensured that the positions of the laminated battery cell and the insulating film are not adjusted during the battery formation process, thereby ensuring the battery molding efficiency and the battery molding quality.

[0016] According to a fourth aspect of the present invention, a battery module is provided, comprising the above-mentioned battery.

[0017] The battery insulating film and the laminated battery cell of the battery module of the embodiment of the present invention, the insulating film wraps the laminated battery cell. By ensuring that the second end of the diaphragm sheet does not contact the bottom surface, it can be ensured that the position of the laminated battery cell and the insulating film is not adjusted during the battery formation process, thereby ensuring the battery molding efficiency and the battery molding quality.

[0018] According to a fifth aspect of the present invention, a battery pack is provided, comprising the above-mentioned battery.

[0019] The battery insulating film and the laminated battery cell of the battery pack of the embodiment of the present invention, the insulating film wraps the laminated battery cell. By ensuring that the second end of the diaphragm sheet does not contact the bottom surface, it can be ensured that the position of the laminated battery cell and the insulating film is not adjusted during the battery formation process, thereby ensuring the battery molding efficiency and the battery molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] For a better understanding of the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0021] Figure 1 is a schematic flow chart of a battery manufacturing method according to an exemplary embodiment;

[0022] Figure 2 is a schematic structural diagram of an insulating film of a battery manufacturing method according to an exemplary embodiment;

[0023] Figure 3 is a schematic diagram of an exploded structure showing a partial structure of a battery according to an exemplary embodiment;

[0024] Figure 4 is a schematic diagram of a partial structure of a battery according to an exemplary embodiment;

[0025] Figure 5 is a schematic diagram of an exploded structure of a first shell and a second shell of a battery according to an exemplary embodiment;

[0026] Figure 6 is a schematic structural diagram of a battery cell according to an exemplary embodiment;

[0027] Figure 7 is a structural schematic diagram showing a stacking method of a battery manufacturing method according to an exemplary embodiment;

[0028] Figure 8 is a structural schematic diagram showing another lamination method of a battery manufacturing method according to an exemplary embodiment;

[0029] Figure 9 is a structural schematic diagram showing a stacking method of a battery manufacturing method according to another exemplary embodiment;

[0030] Figure 10 FIG. 1 is a schematic structural diagram of another lamination method of a battery manufacturing method according to another exemplary embodiment.

[0031] The following are the descriptions of the reference numerals:

[0032] 10. Insulating film; 11. First region; 12. Second region; 13. Fixed insulating film; 20. Laminated battery cell; 21. First pole piece; 22. Second pole piece; 23. Diaphragm; 231. First end; 232. Second end; 233. Sub-diaphragm; 24. Bottom surface; 25. Battery cell body; 26. Tab; 30. Protective bracket; 40. First shell; 41. Accommodating cavity; 42. First flange edge; 50. Second shell; 51. Second flange edge; 60. Pole assembly. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0034] In the description of this disclosure, unless otherwise expressly provided or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more; and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" or "an" object is also intended to mean one of a possible plurality of such objects.

[0035] Unless otherwise specified or explained, the terms "connect," "fixed," etc. should be understood broadly. For example, "connected" may refer to a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; and "connected" may refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0036] Furthermore, in the description of the present disclosure, it should be understood that the directional words such as “upper”, “lower”, “inner” and “outer” described in the example embodiments of the present disclosure are described based on the angles shown in the accompanying drawings and should not be understood as limiting the example embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) “upper”, “lower”, or “inner” or “outer”, it can not only be directly connected to the other (one or more) elements “upper”, “lower” or “inner” or “outer”, but can also be indirectly connected to the other (one or more) elements “upper”, “lower” or “inner” or “outer” through an intermediate element.

[0037] One embodiment of the present invention provides a battery manufacturing method, please refer to Figure 1 , the battery manufacturing method includes:

[0038] S101, providing an insulating film 10;

[0039] S103 , laminating on the insulating film 10 to form a laminated battery core 20 , wherein the laminated battery core 20 includes a diaphragm sheet 23 different from the insulating film 10 ;

[0040] S105 , wrapping the laminated battery core 20 with the insulating film 10 .

[0041] A battery manufacturing method according to an embodiment of the present invention forms a laminated battery cell 20 by stacking batteries on an insulating film 10, and then wrapping the laminated battery cell 20 with the insulating film 10, thereby eliminating the process of moving the laminated battery cell 20 to the insulating film 10. This not only improves the manufacturing efficiency of the battery, but also avoids the risk of foreign matter mixing in during transportation.

[0042] It should be noted that the laminated battery cell 20 includes a diaphragm sheet 23 that is different from the insulating film 10. That is, the diaphragm sheet 23 and the insulating film 10 are independent structures. The materials of the diaphragm sheet 23 and the insulating film 10 can be the same or different. Furthermore, this actually emphasizes that the insulating film 10 is independent of the laminated battery cell 20. The insulating film 10 and the laminated battery cell 20 are two different parts, and the laminated battery cell 20 does not include the insulating film 10.

[0043] In one embodiment, the battery manufacturing method further includes: before forming the laminated battery core 20 on the insulating film 10 , positioning the insulating film 10 to prevent the insulating film 10 from shifting and ensure the quality of the laminate.

[0044] It should be noted that, during the process of forming the laminated battery cell 20 on the insulating film 10, the insulating film 10 can be positioned on a certain component, for example, on the first shell 40, the second shell 50, or on some supporting structure, so as to ensure that the position of the insulating film 10 is fixed, thereby facilitating the subsequent formation of the laminated battery cell 20. The forming method of the laminated battery cell 20 can be a forming method in the related art, which is not limited here. For example, a Z-shaped continuous lamination method or a method of stacking the electrode sheets and the diaphragm sheets in sequence can be adopted.

[0045] The position of the laminated battery cell 20 on the insulating film 10 is relatively fixed, so it can be ensured that the laminated battery cell 20 is formed on the insulating film 10, and when the laminated battery cell 20 is wrapped with the insulating film 10, there is no need to adjust the relative position of the laminated battery cell 20 and the insulating film 10, thereby improving the production efficiency and preventing the laminated battery cell 20 from scattering.

[0046] It should be noted that by performing Z-shaped continuous lamination directly on the insulating film 10, after the lamination is completed, the laminated battery cell 20 does not need to be wrapped with the diaphragm sheet 23, and can be directly wrapped with the insulating film 10. In this way, fluctuations in the tension of the diaphragm sheet can be avoided, and the equipment and process can be simplified. At the same time, after the insulating film 10 is bonded and fixed to the surface of the laminated battery cell 20, it can also take into account the protection of the exposed negative electrode sheet.

[0047] When using Z-shaped continuous lamination, the positive electrode sheet and the negative electrode sheet are placed on the upper and lower sides of the diaphragm sheet 23 respectively, and the positive electrode sheet and the negative electrode sheet are fixed on the upper and lower surfaces of the diaphragm sheet 23 respectively, so that a group of composite units are formed on the diaphragm sheet 23; according to the specifications of the required laminated battery cell 20, multiple groups of composite units are formed on the diaphragm sheet 23 along the length direction of the diaphragm sheet 23, and the last group of composite units can only retain the negative electrode sheet on the diaphragm sheet 23; lamination is started on the insulating film 10, and on the basis of positioning the first group of composite units on the insulating film 10, the remaining groups of composite units are stacked on the first group of composite units in sequence with the positive electrode sheet always facing upwards. After the last group of composite units is stacked to form a stacked unit, the diaphragm sheet is cut, and the laminated battery cell 20 is formed after hot pressing, and then the laminated battery cell 20 is wrapped with the insulating film 10. Combined Figure 8 As shown, the first electrode 21 may be a negative electrode, and the second electrode 22 may be a positive electrode. Figure 8 The first pole piece 21 and the second pole piece 22 shown in the figure are separated from the diaphragm piece 23. In actual operation, the first pole piece 21 and the second pole piece 22 are respectively attached to the upper and lower surfaces of the diaphragm piece 23.

[0048] It should be noted that the battery case includes a first case 40 and a second case 50. The battery case is used to seal the laminated battery cell 20. The sealed laminated battery cell 20 includes a stacked first electrode sheet 21, a diaphragm sheet 23, and a second electrode sheet 22. The laminated battery cell 20 is stacked in the first direction. At this time, the two opposing surfaces of the laminated battery cell 20 along the first direction correspond to the upper cover and bottom plate of the battery case, respectively. The inner surfaces of the upper cover and bottom plate facing the laminated battery cell 20 can be understood as the upper surfaces of the first case 40 and the second case 50.

[0049] In one embodiment, the battery manufacturing method further includes: prior to laminating the insulating film 10, placing the insulating film 10 on a first housing 40, the first housing 40 comprising one of an upper cover and a bottom plate of the battery housing. This means that the laminated battery cells 20 are formed on the first housing 40 having the insulating film 10, and the subsequent positioning of the laminated battery cells 20 and the first housing 40 can be omitted, thereby improving battery production efficiency.

[0050] Alternatively, the insulating film 10 may be directly laid on the first housing 40. Before lamination, when the first housing 40 has the accommodating cavity 41, the lower surface of the insulating film 10 may not be in contact with the upper surface of the first housing 40. After lamination begins, the insulating film 10 is pressed against the upper surface of the first housing 40. Of course, when the first housing 40 is a flat plate, the lower surface of the insulating film 10 may be in contact with the upper surface of the first housing 40.

[0051] Optionally, the insulating film 10 is arranged on the first shell 40 in such a way that the lower surface of the insulating film 10 overlaps with the upper surface of the first shell 40, that is, before lamination begins, the lower surface of the insulating film 10 is in contact with the upper surface of the first shell 40, which can ensure a good positioning effect.

[0052] It should be noted that the lower surface of the insulating film 10 overlaps with the upper surface of the first shell 40 . In this case, the insulating film 10 and the first shell 40 may be non-fixed.

[0053] Optionally, the battery manufacturing method further includes: bonding the lower surface of the insulating film 10 and the upper surface of the first shell 40 , that is, the insulating film 10 and the first shell 40 are fixedly arranged.

[0054] In one embodiment, the battery manufacturing method further includes: after wrapping the laminated battery cell 20 with the insulating film 10, connecting the second shell 50 to the first shell 40 to seal the laminated battery cell 20. The second shell 50 includes the other of the upper cover and the bottom plate of the battery shell. That is, the first shell 40 and the second shell 50 constitute the battery shell, thereby sealing the laminated battery cell 20. The second shell 50 and the first shell 40 can be welded or bonded.

[0055] In one embodiment, Figure 5 As shown, a first flange edge 42 is provided on the circumferential outer edge of the first shell 40, and a second flange edge 51 is provided on the circumferential outer edge of the second shell 50. Connecting the first shell 40 with the second shell 50 includes: welding the first flange edge 42 and the second flange edge 51, thereby achieving a stable connection between the first shell 40 and the second shell 50, ensuring that the first shell 40 and the second shell 50 can form a sufficiently large weld, and the welding difficulty is relatively low.

[0056] It should be noted that the first flange edge 42 is provided on the circumferential outer edge of the first shell 40, and the second flange edge 51 is provided on the circumferential outer edge of the second shell 50. It can be understood as: a flange edge formed by extending outward from the circumferential outer edge of a flat plate, or a flange edge formed by extending outward from the side wall of a structure with a accommodating cavity, and the flange edge is roughly perpendicular to the side wall.

[0057] In one embodiment, the battery manufacturing method further includes cutting portions of the first flange edge 42 and the second flange edge 51 after welding the first flange edge 42 and the second flange edge 51, thereby reducing the length of the first flange edge 42 and the second flange edge 51 and ensuring that the first flange edge 42 and the second flange edge 51 occupy a smaller space.

[0058] Optionally, the portions of the first flange side 42 and the second flange side 51 extending along the length direction of the battery are cut, and the portions of the first flange side 42 and the second flange side 51 extending along the width direction of the battery are cut.

[0059] Alternatively, only the first flange side 42 and the second flange side 51 extending along the length direction of the battery are cut. Alternatively, only the first flange side 42 and the second flange side 51 extending along the width direction of the battery are cut.

[0060] Specifically, the battery manufacturing method also includes: before forming the laminated battery cell 20 on the insulating film 10, positioning the insulating film 10 on the first shell 40 of the battery, that is, forming the laminated battery cell 20 on the first shell 40 having the insulating film 10, and the subsequent process of positioning the laminated battery cell 20 and the first shell 40 can also be omitted, thereby improving the production efficiency of the battery.

[0061] Optionally, the battery manufacturing method further includes: before forming the laminated battery core 20 on the insulating film 10, positioning the insulating film 10 on the second battery shell 50. The first battery shell 40 and the second battery shell 50 are used to seal the laminated battery core 20 of the battery.

[0062] Specifically, the insulating film 10 is bonded to the first shell 40 , thereby fixing the insulating film 10 to the first shell 40 .

[0063] Optionally, the insulating film 10 is bonded to the second shell 50 , thereby fixing the insulating film 10 to the second shell 50 .

[0064] It should be noted that when the insulating film 10 is positioned on the first shell 40 or the second shell 50, the stacked battery cell 20 is formed in the area where the insulating film 10 covers the first shell 40 or the second shell 50. Therefore, after the insulating film 10 wraps the stacked battery cell 20, the position of the stacked battery cell 20 does not need to be adjusted, and the subsequent docking of the first shell 40 and the second shell 50 can be carried out, thereby reducing the process.

[0065] In one embodiment, a pole assembly 60 is provided on the first shell 40, and the battery manufacturing method further includes: before wrapping the laminated battery cell 20 with the insulating film 10, the laminated battery cell 20 is connected to the pole assembly 60, thereby facilitating the connection between the laminated battery cell 20 and the pole assembly 60, the operation is simple, and there is sufficient installation and fixing space. For example, when welding the tab 26 of the laminated battery cell 20 and the pole assembly 60, sufficient welding space can be guaranteed.

[0066] The pole assembly 60 is integrated into the first shell 40. When stacking, after isolation with the insulating film 10, the stacking is performed directly on the first shell 40 carrying the insulating film 10. In this way, during the stacking process, the alignment of the laminated battery cell 20 and the pole assembly 60 is directly achieved. After the stacking is completed, the laminated battery cell 20 can be directly electrically connected to the pole assembly 60, which simplifies the battery assembly process and reduces the risk of poor alignment of the pole tabs of different pole pieces in the laminated battery cell 20 during transportation.

[0067] Optionally, a pole assembly 60 is provided on the second shell 50, and the battery manufacturing method also includes: before welding the second shell 50 to the first shell 40, connecting the laminated battery cell 20 to the pole assembly 60, that is, ensuring that the laminated battery cell 20 and the pole assembly 60 can be connected before being sealed in the second shell 50 and the first shell 40.

[0068] It should be noted that there are two pole assemblies 60, and both pole assemblies 60 can be located on the first shell 40 or the second shell 50, or the two pole assemblies 60 can be located on the first shell 40 and the second shell 50 respectively. Figure 4 As shown, it can be seen that the pole assembly 60 is disposed on the first housing 40 .

[0069] In one embodiment, at least one of the first shell 40 and the second shell 50 is formed with a receiving cavity 41 for receiving the laminated battery core 20 .

[0070] In some embodiments, the first shell 40 can be a flat plate, and the second shell 50 is formed with a receiving cavity 41. The laminated battery cell 20 is located in the receiving cavity 41. The flat plate arrangement can facilitate subsequent connection and has low processing difficulty. Alternatively, the first shell 40 is formed with a receiving cavity 41, and the second shell 50 can be a flat plate. Alternatively, both the first shell 40 and the second shell 50 are formed with a receiving cavity 41, and the depths of the receiving cavities 41 of the first shell 40 and the second shell 50 can be the same or different. Figure 5 As shown, the second housing 50 is formed with a receiving cavity 41 for receiving Figure 6 The laminated battery cell 20 shown in FIG.

[0071] It should be noted that when the first shell 40 is formed with a accommodating cavity 41, when the insulating film 10 is positioned on the first shell 40 and the laminated battery cell 20 is formed, since the first shell 40 is formed with a accommodating cavity 41, during the stacking process, the limiting alignment function of the laminated battery cell 20 can be directly realized, reducing the requirements for equipment and processes during the assembly process and improving the product yield.

[0072] Optionally, in some embodiments, after the laminated battery cell 20 is wrapped with the insulating film 10, the laminated battery cell 20 wrapped with the insulating film 10 is placed in the second shell 50 and the first shell 40, and the welding of the second shell 50 and the first shell 40 is completed, that is, the insulating film 10 is not positioned on the second shell 50 or the first shell 40.

[0073] In one embodiment, Figure 2 As shown, the insulating film 10 includes a first region 11 and a second region 12, and the laminated battery 20 is movably arranged relative to the first region 11; at least a portion of the second region 12 can be adhered to the laminated battery 20. At least a portion of the first region 11 is non-adhesive, so that during the molding process of the laminated battery 20, the portion that first contacts the first region 11 can be movable relative to the first region 11, thereby moving to a relatively fixed position to ensure subsequent reliable molding. The second region 12 is adhesive, which not only allows the second region 12 to be reliably bonded to the laminated battery 20 when the laminated battery 20 is subsequently wrapped with the insulating film 10, but also allows the portion that first contacts the first region 11 to be positioned during the molding process of the laminated battery 20, thereby preventing a large amount of the laminated battery 20 from entering the second region 12.

[0074] Optionally, the boundary between the first region 11 and the second region 12 may be adhesive, and the edge of the laminated battery core 20 may be located at the boundary between the first region 11 and the second region 12 to achieve adhesion.

[0075] Optionally, both the first region 11 and the second region 12 of the insulating film 10 may not have adhesive properties.

[0076] Part of the insulating film 10 may be an adhesive insulating film, or an adhesive may be provided on a non-adhesive insulating film to ensure adhesive properties, ie, to form the second region 12 having adhesive properties.

[0077] In one embodiment, the first region 11 is rectangular, and the area of ​​the first region 11 is s. Before the laminated battery cell 20 is wrapped with the insulating film 10, the area of ​​the laminated battery cell 20 in contact with the insulating film 10 is t, and 0.5t≤s≤1.2t. During the molding process of the laminated battery cell 20, the first piece cannot be placed in the corresponding position of the insulating film 10 at one time, and it is necessary to allow movement on the surface of the insulating film 10 to achieve positioning, so a non-adhesive first region 11 is provided. After the first piece is stacked, the subsequent stacking will cause the first piece of the pole piece to shift, resulting in poor alignment, while the second region 12 with adhesiveness can ensure that the first piece of the laminate does not shift. After the stacking is completed, the laminated battery cell 20 can be directly wrapped by relying on the adhesive layer of the second region 12 to avoid problems such as poor alignment of the pole tabs during transportation of the laminated battery cell 20.

[0078] It should be noted that the area of ​​the first region 11 is s, and the area of ​​contact between the laminated battery cell 20 and the insulating film 10 before the laminated battery cell 20 is wrapped with the insulating film 10 is t. It can be further understood that the length of the first region 11 can be equal to the length of the laminated battery cell 20, and the width of the first region 11 can be greater than the width of the laminated battery cell 20, or the width of the first region 11 can be equal to the width of the laminated battery cell 20, or the width of the first region 11 can be less than the width of the laminated battery cell 20, thereby ensuring that the laminated battery cell 20 is movable within the first region 11 and will not deviate from the first region 11 excessively. The length and width of the laminated battery cell 20 can be considered as the length and width of the surface of the laminated battery cell 20 in contact with the insulating film 10 before the laminated battery cell 20 is wrapped with the insulating film 10, and the length is not less than the width.

[0079] In one embodiment, the battery manufacturing method further includes: before wrapping the laminated battery cell 20 with the insulating film 10, providing a protective bracket 30 at at least one end of the laminated battery cell 20; wherein, when the laminated battery cell 20 is wrapped with the insulating film 10, the insulating film 10 covers the protective bracket 30, that is, the protective bracket 30 is also fixed in the process of wrapping the laminated battery cell 20 with the insulating film 10, thereby eliminating the need for subsequent fixing of the protective bracket 30. Figure 3 It can be seen that the end portion of the insulating film 10 covers the protection bracket 30 .

[0080] It should be noted that the protective bracket 30 is arranged between the battery case and the laminated battery cell 20 to play an insulating and fixing role, wherein the battery case includes a first shell 40 and a second shell 50. There are two protective brackets 30, and the two protective brackets 30 are respectively located at both ends of the laminated battery cell 20. After the laminated battery cell 20 is completed, the two protective brackets 30 are respectively set at both ends of the laminated battery cell 20, and can be located on the insulating film 10, or not on the insulating film 10, but it is necessary to ensure that the insulating film 10 can cover part of the protective bracket 30 during the subsequent wrapping process of the insulating film 10.

[0081] Optionally, both ends of the insulating film 10 extend beyond both ends of the laminated battery core 20 and are fixedly connected to the protective brackets 30 at both ends. The connection method can be to rely on the adhesive bonding of the insulating film 10 or to further perform hot-melt fixed connection.

[0082] In one embodiment, after wrapping the laminated battery cell 20 with the insulating film 10, part of the laminated battery cell 20 is not wrapped by the insulating film 10, and the battery manufacturing method further includes: partially pasting the fixed insulating film 13 on the insulating film 10, and partially pasting it on the laminated battery cell 20 not wrapped by the insulating film 10, so that the fixed insulating film 13 can reliably fix the insulating film 10 on the laminated battery cell 20, thereby avoiding the falling off of the insulating film 10.

[0083] Optionally, the two ends of the insulating film 10 are spaced apart on the laminated battery cell 20, thereby exposing part of the laminated battery cell 20, and the fixed insulating film 13 overlaps with the two ends of the insulating film 10 while covering the exposed part of the laminated battery cell 20, thereby ensuring that the insulating film 10 is reliably wrapped on the laminated battery cell 20 to ensure reliable electrical isolation.

[0084] It should be noted that, in some embodiments, it is not excluded that the fixed insulating film 13 may be bonded to the protective bracket 30 .

[0085] In one embodiment, Figure 7 As shown, the laminated battery cell 20 includes a first electrode sheet 21, a second electrode sheet 22, and a diaphragm sheet 23. The diaphragm sheet 23 is disposed between the first electrode sheet 21 and the second electrode sheet 22. Multiple pairs of first electrode sheets 21 and second electrode sheets 22 are stacked to form the laminated battery cell 20. The diaphragm sheet 23 is a discontinuous diaphragm sheet, that is, during lamination, independent first electrode sheets 21, second electrode sheets 22, and diaphragm sheets 23 are cyclically placed on the insulating film 10 to form the laminated battery cell 20. After the first electrode sheet 21, the second electrode sheet 22, and the diaphragm sheet 23 are laminated, a hot pressing process can be performed.

[0086] Furthermore, the diaphragm 23 includes a plurality of sub-diaphragms 233, and the laminated battery cell 20 includes a plurality of electrode units, the electrode unit including a first electrode 21, a second electrode 22, and a sub-diaphragm 233 arranged between the first electrode 21 and the second electrode 22. There is a sub-diaphragm 233 between adjacent electrode units, and the sub-diaphragm 233 of adjacent electrode units is a discontinuous diaphragm, thereby ensuring that each electrode unit can be stacked independently. Optionally, the sub-diaphragms 233 of adjacent electrode units can be independently set. For example, if there are three electrode units, there are two sub-diaphragms 233 of adjacent electrode units, and in this case, the two sub-diaphragms 233 are independently set. Alternatively, the sub-diaphragms 233 of adjacent electrode units can be connected. For example, if there are three electrode units, the sub-diaphragms 233 of adjacent electrode units are a whole. Therefore, the plurality of sub-diaphragm sheets 233 included in the diaphragm sheet 23 may all be consistent with each other, or at least one of the plurality of sub-diaphragm sheets 233 included in the diaphragm sheet 23 may be inconsistent with the others.

[0087] In one embodiment, the first electrode piece 21 or the second electrode piece 22 first contacts the insulating film 10; or, the diaphragm piece 23 first contacts the insulating film 10. During the lamination process, the first electrode piece 21, the second electrode piece 22, and the diaphragm piece 23 can all first contact the insulating film 10, as long as the diaphragm piece 23 is provided between the first electrode piece 21 and the second electrode piece 22. The first electrode piece 21 and the second electrode piece 22 can be of the same size or different sizes. One of the first electrode piece 21 and the second electrode piece 22 is a positive electrode piece, and the other is a negative electrode piece. The positive electrode piece cannot first contact the insulating film 10.

[0088] In one embodiment, Figure 8 As shown, the laminated battery cell 20 includes a first electrode piece 21, a second electrode piece 22 and a diaphragm piece 23. The diaphragm piece 23 is arranged between the first electrode piece 21 and the second electrode piece 22. Multiple pairs of first electrode pieces 21 and second electrode pieces 22 are stacked to form the laminated battery cell 20; wherein, the diaphragm piece 23 is a continuous diaphragm piece, that is, in the specific lamination process, the diaphragm piece 23 is an uninterrupted diaphragm piece, so that the first electrode piece 21 and the second electrode piece 22 are arranged in sequence on both sides of the diaphragm piece 23.

[0089] In one embodiment, the diaphragm 23 first contacts the insulating film 10 , thereby preventing the first pole piece 21 or the second pole piece 22 from being separated from the diaphragm 23 and ensuring the stability of the laminate.

[0090] Furthermore, the diaphragm 23 includes a first end 231 and a second end 232; wherein the first end 231 is stacked before the second end 232. After the laminated battery cell 20 is wrapped with the insulating film 10, at least one of the first end 231 and the second end 232 directly contacts the insulating film 10. The first end 231 and the second end 232 of the diaphragm 23 are the starting point and the ending point of the diaphragm 23, respectively, at the beginning of the stacking. That is, at the beginning of the stacking, the first end 231 first passes through the insulating film 10. After the stacking is completed, the diaphragm 23 is cut to form the second end 232, and then the insulating film 10 is wrapped.

[0091] It should be noted that, during lamination, the first end 231 of the diaphragm sheet 23 can be directly pressed below the first electrode sheet 21 or the second electrode sheet 22 located at the bottom. Therefore, after lamination is subsequently completed, there is no need to wrap the first end 231 along with the insulating film 10 around the laminated battery core 20. Alternatively, the first end 231 of the diaphragm sheet 23 may not be directly pressed below the first electrode sheet 21 or the second electrode sheet 22, that is, the first end 231 is located outside the first electrode sheet 21 or the second electrode sheet 22. Therefore, after lamination is subsequently completed, the first end 231 will be wrapped around the laminated battery core 20 along with the insulating film 10.

[0092] The second end 232 of the diaphragm 23 can just cover the uppermost first electrode 21 or the second electrode 22, that is, the second end 232 of the diaphragm 23 does not cover the side of the laminated battery core 20. Alternatively, the second end 232 of the diaphragm 23 can cover the side of the laminated battery core 20.

[0093] In some embodiments, by adjusting the positions of the first end 231 and the second end 232 of the diaphragm 23, the outer portion of the laminated battery core 20 can be wrapped with the diaphragm 23. Alternatively, the outer portion of the laminated battery core 20 can be not wrapped with the diaphragm 23, which is not limited here.

[0094] In some embodiments, after the laminated battery core 20 is formed, it is possible to partially raise the laminated battery core 20 so that the second end 232 enters between the bottom surface 24 of the laminated battery core 20 and the insulating film 10, but this process requires an additional manufacturing process.

[0095] In this embodiment, after the laminated battery core 20 is formed, it is not necessary to move the laminated battery core 20 relative to the insulating film 10 , thereby ensuring that the second end 232 does not contact the bottom surface 24 .

[0096] like Figure 6 As shown, the laminated cell 20 includes a cell body 25 and a tab 26, wherein the tab 26 extends from the length direction of the cell body 25; wherein the tab 26 is connected to the pole assembly 60. The tab 26 and the pole assembly 60 can be directly connected, that is, the tab 26 and the pole assembly 60 can be directly welded, or the tab 26 and the pole assembly 60 can be connected via a metal adapter. The specific connection method can be welding, and riveting is not excluded, which is not limited here.

[0097] It should be noted that the battery cell body 25 includes more than two pole pieces (including a first pole piece 21 and a second pole piece 22), and the pole piece 26 includes more than two single-piece pole pieces, which extend from the corresponding pole pieces respectively. The width of the single-piece pole piece is less than the width of the pole piece. Multiple single-piece pole pieces are stacked to form the pole piece 26, which is connected to the pole piece assembly 60, wherein the pole piece 26 can be welded to the pole piece assembly 60. The single-piece pole piece is made of a metal foil with good electrical and thermal conductivity, such as aluminum, copper or nickel. Optionally, the width of the single-piece pole piece can also be equal to the width of the pole piece.

[0098] In some embodiments, there are two pole assemblies 60, which are respectively a positive pole assembly and a negative pole assembly. There are also two pole ears 26, which are respectively a positive pole ear and a negative pole ear. The positive pole assembly is connected to the positive pole ear, and the negative pole assembly is connected to the negative pole ear.

[0099] It should be noted that after stacking two or more single-piece tabs, they can be pre-welded. The pre-welding can be done by ultrasonic welding, and then welded to the pole assembly 60 to ensure the welding reliability of the tab 26 and the pole assembly 60. The welding of the tab 26 and the pole assembly 60 can be done by laser welding or resistance welding. After welding, the tab 26 can be bent to prevent electrical connection between the tab 26 and other components.

[0100] It should be noted that the welding in the above embodiments may be performed by laser welding, ultrasonic welding, resistance welding, etc.

[0101] One embodiment of the present invention further provides a battery, including a battery obtained by the above-mentioned battery manufacturing method.

[0102] A battery according to an embodiment of the present invention forms a laminated battery cell 20 on an insulating film 10 and then wraps the laminated battery cell 20 with the insulating film 10, thereby eliminating the process of moving the laminated battery cell 20 to the insulating film 10. This not only improves the manufacturing efficiency of the battery, but also avoids positioning problems caused by moving the laminated battery cell 20.

[0103] An embodiment of the present invention also provides a battery, including: an insulating film 10; a laminated battery cell 20, the insulating film 10 wraps the laminated battery cell 20, the laminated battery cell 20 includes a first electrode sheet 21, a second electrode sheet 22 and a diaphragm sheet 23, the diaphragm sheet 23 is arranged between the first electrode sheet 21 and the second electrode sheet 22; wherein, the diaphragm sheet 23 includes a first end 231 and a second end 232, the first end 231 is the starting end when the diaphragm sheets 23 are stacked, and the second end 232 is the ending end when the diaphragm sheets 23 are stacked, the laminated battery cell 20 has a bottom surface 24, and the bottom surface 24 is formed first when the laminated battery cell 20 is stacked, and the second end 232 does not contact the bottom surface 24.

[0104] A battery according to an embodiment of the present invention includes an insulating film 10 and a laminated battery cell 20. The insulating film 10 wraps the laminated battery cell 20. By ensuring that the second end 232 of the diaphragm sheet 23 does not contact the bottom surface 24, it is possible to ensure that the positions of the laminated battery cell 20 and the insulating film 10 are not adjusted during the battery formation process, thereby ensuring the battery forming efficiency and the battery forming quality.

[0105] It should be noted that, during the process of laminating the laminated battery cell 20, the first electrode piece 21, the second electrode piece 22, or the diaphragm piece 23 first contacts the insulating film 10. At this point, it can be understood that the laminated battery cell 20 forms the bottom surface 24. The second end 232 does not contact the bottom surface 24. That is, after the laminated battery cell 20 is formed on the insulating film 10, the laminated battery cell 20 will not move relative to the insulating film 10.

[0106] In one embodiment, Figure 9 As shown, the diaphragm sheet 23 is a discontinuous diaphragm sheet, comprising multiple sub-diaphragm sheets 233. The first end 231 is the end of the first stacked sub-diaphragm sheet 233, and the second end 232 is the end of the last stacked sub-diaphragm sheet 233. In other words, the individual sub-diaphragm sheets 233 are stacked sequentially, with the end or leading end of the first stacked sub-diaphragm sheet 233 being considered the first end 231 of the diaphragm sheet 23, and the end or leading end of the last stacked sub-diaphragm sheet 233 being considered the second end 232 of the diaphragm sheet 23. Further definitions of discontinuous diaphragms can be found in the aforementioned battery manufacturing method and are not further elaborated here.

[0107] In one embodiment, the diaphragm 23 is a continuous diaphragm, that is, one end of the diaphragm 23 is the starting end of the laminate, and the other end formed after cutting is the ending end of the laminate, that is, the diaphragm 23 includes a first end 231 and a second end 232. Figure 10 As shown, the first pole piece 21 and the second pole piece 22 are respectively located on both sides of the diaphragm 23 .

[0108] In one embodiment, the length of the battery is a, 400 mm ≤ a ≤ 2500 mm, the width of the battery is b, the height of the battery is c, 2b ≤ a ≤ 50b, and / or 0.5c ≤ b ≤ 20c.

[0109] Furthermore, 50mm≤b≤200mm, 10mm≤c≤100mm.

[0110] Preferably, 4b≤a≤25b, and / or, 2c≤b≤10c.

[0111] In the battery of the above embodiment, while ensuring sufficient energy density, the ratio of the battery length to the width is large, and further, the ratio of the battery width to the height is large.

[0112] In one embodiment, the length of the battery is a, the width of the battery is b, and 4b≤a≤7b, that is, the ratio of the length to the width of the battery in this embodiment is large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery module.

[0113] In one embodiment, the height of the battery is c, 3c≤b≤7c, and the ratio of the battery width to the height is large, which is convenient for formation while ensuring sufficient energy density.

[0114] Optionally, the length of the battery may be 500 mm to 1500 mm, the width of the battery may be 80 mm to 150 mm, and the height of the battery may be 15 mm to 25 mm.

[0115] It should be noted that the length of the battery is the dimension of the battery in the length direction, the width of the battery is the dimension of the battery in the width direction, and the height of the battery is the dimension of the battery in the height direction, that is, the thickness of the battery.

[0116] An embodiment of the present invention further provides a battery module including the above-mentioned battery.

[0117] The battery of the battery module of one embodiment of the present invention forms a stacked battery cell 20 on an insulating film 10, and then wraps the stacked battery cell 20 with the insulating film 10, thereby eliminating the process of moving the stacked battery cell 20 to the insulating film 10. This not only improves the manufacturing efficiency of the battery, but also avoids positioning problems caused by moving the stacked battery cell 20.

[0118] In some embodiments, the battery module includes at least two batteries, and the at least two batteries are arranged in parallel.

[0119] An embodiment of the present invention further provides a battery pack including the above-mentioned battery module.

[0120] A battery pack according to an embodiment of the present invention includes a battery module. The batteries of the battery module are formed by forming a laminated battery cell 20 on an insulating film 10 and then wrapping the laminated battery cell 20 with the insulating film 10. This eliminates the need to move the laminated battery cell 20 to the insulating film 10. This not only improves the manufacturing efficiency of the battery, but also avoids positioning problems caused by moving the laminated battery cell 20.

[0121] Optionally, the battery pack includes at least two battery modules, and the battery pack may further include a box, in which the at least two battery modules are arranged.

[0122] An embodiment of the present invention further provides a battery pack including the above-mentioned battery.

[0123] The battery of the battery pack of one embodiment of the present invention forms a laminated battery cell 20 on an insulating film 10, and then wraps the laminated battery cell 20 with the insulating film 10, thereby eliminating the process of moving the laminated battery cell 20 to the insulating film 10. This not only improves the manufacturing efficiency of the battery, but also avoids positioning problems caused by moving the laminated battery cell 20.

[0124] Optionally, the battery pack includes at least two batteries, and the battery pack may further include a box, in which the at least two batteries are arranged.

[0125] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the inventions disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and illustrative embodiments are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

[0126] It should be understood that the present disclosure is not limited to the precise structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A battery manufacturing method, characterized in that: include: providing an insulating film (10); Laminating on the insulating film (10) to form a laminated battery core (20), wherein the laminated battery core (20) includes a diaphragm sheet (23) different from the insulating film (10); A protective bracket (30) is provided at at least one end of the laminated battery core (20); wrapping the laminated battery core (20) with the insulating film (10), with a portion of the laminated battery core (20) not being wrapped by the insulating film (10); The fixed insulating film (13) is partially pasted on the insulating film (10) and partially pasted on the laminated battery core (20) not wrapped by the insulating film (10), and the fixed insulating film (13) is bonded to the protective bracket (30).

2. The battery manufacturing method according to claim 1, characterized in that: Also includes: Before lamination is performed on the insulating film (10), the insulating film (10) is arranged on a first housing (40), wherein the first housing (40) includes one of an upper cover and a bottom plate of a battery housing.

3. The battery manufacturing method according to claim 2, characterized in that: The insulating film (10) is disposed on the first shell (40) in such a manner that the lower surface of the insulating film (10) overlaps with the upper surface of the first shell (40).

4. The battery manufacturing method according to claim 3, characterized in that: Also includes: The lower surface of the insulating film (10) and the upper surface of the first shell (40) are bonded together.

5. The battery manufacturing method according to any one of claims 2 to 4, characterized in that: Also includes: After wrapping the laminated battery core (20) with the insulating film (10), a second shell (50) and the first shell (40) are connected to seal the laminated battery core (20), wherein the second shell (50) includes the other of the upper cover and the bottom plate of the battery shell.

6. The battery manufacturing method according to claim 5, characterized in that: A first flange (42) is provided on the circumferential outer edge of the first shell (40), and a second flange (51) is provided on the circumferential outer edge of the second shell (50). Connecting the second shell (50) to the first shell (40) includes: The first flange edge (42) and the second flange edge (51) are welded.

7. The battery manufacturing method according to any one of claims 2 to 4, characterized in that: A pole assembly (60) is provided on the first housing (40), and the battery manufacturing method further comprises: Before wrapping the laminated battery core (20) with the insulating film (10), The laminated battery core (20) is connected to the pole assembly (60).

8. The battery manufacturing method according to any one of claims 1 to 4, characterized in that: The insulating film (10) comprises a first region (11) and a second region (12), and the laminated battery core (20) is movably arranged relative to the first region (11); At least a portion of the second region (12) is adhered to the laminated battery core (20).

9. The battery manufacturing method according to claim 8, characterized in that: The first region (11) is rectangular, the area of ​​the first region (11) is s, and before the laminated battery core (20) is wrapped with the insulating film (10), the area of ​​contact between the laminated battery core (20) and the insulating film (10) is t, and 0.5t≤s≤1.2t.

10. The battery manufacturing method according to any one of claims 1 to 4, characterized in that: When the laminated battery core (20) is wrapped with the insulating film (10), the insulating film (10) covers the protective bracket (30).

11. The battery manufacturing method according to any one of claims 1 to 4, characterized in that: The laminated battery core (20) further comprises a first pole piece (21) and a second pole piece (22), and the diaphragm (23) is arranged between the first pole piece (21) and the second pole piece (22); Wherein, the diaphragm (23) is a continuous diaphragm, or The diaphragm (23) includes a plurality of sub-diaphragm sheets (233); the laminated battery core (20) includes a plurality of pole piece units; the pole piece unit includes the first pole piece (21), the second pole piece (22), and the sub-diaphragm sheet (233) arranged between the first pole piece (21) and the second pole piece (22); the sub-diaphragm sheet (233) is provided between adjacent pole piece units, and the sub-diaphragm sheets (233) of adjacent pole piece units are discontinuous diaphragm sheets.

12. The battery manufacturing method according to claim 11, characterized in that: The diaphragm (23) first contacts the insulating film (10), and the diaphragm (23) includes a first end (231) and a second end (232); The first end (231) is stacked before the second end (232), and after the laminated battery core (20) is wrapped with the insulating film (10), at least one of the first end (231) and the second end (232) is in direct contact with the insulating film (10).

13. A battery, characterized in that: A battery obtained by the battery manufacturing method according to any one of claims 1 to 12.

14. A battery, characterized in that: include: Insulating film (10); A laminated battery cell (20), wherein the insulating film (10) wraps the laminated battery cell (20), the laminated battery cell (20) comprises a first pole piece (21), a second pole piece (22) and a diaphragm (23), the diaphragm (23) being arranged between the first pole piece (21) and the second pole piece (22), a protective bracket (30) being arranged at at least one end of the laminated battery cell (20), a portion of the laminated battery cell (20) not being wrapped by the insulating film (10), a fixed insulating film (13) being partially adhered to the insulating film (10), and a portion of the fixed insulating film (13) being adhered to the portion of the laminated battery cell (20) not being wrapped by the insulating film (10), and the fixed insulating film (13) being bonded to the protective bracket (30); The diaphragm (23) includes a first end (231) and a second end (232), the first end (231) being the starting end when the diaphragm (23) is stacked, and the second end (232) being the ending end when the diaphragm (23) is stacked, the laminated battery cell (20) has a bottom surface (24), and the bottom surface (24) is formed first when the laminated battery cell (20) is stacked, and the second end (232) does not contact the bottom surface (24).

15. The battery according to claim 14, characterized in that The diaphragm (23) is a continuous diaphragm; Alternatively, the diaphragm (23) includes a plurality of sub-diaphragm sheets (233), the laminated battery cell (20) includes a plurality of electrode units, the electrode unit includes the first electrode (21), the second electrode (22), and the sub-diaphragm sheet (233) arranged between the first electrode (21) and the second electrode (22), the sub-diaphragm sheet (233) is provided between adjacent electrode units, and the sub-diaphragm sheets (233) of adjacent electrode units are discontinuous diaphragm sheets, the first end (231) is one end of the first stacked sub-diaphragm sheet (233), and the second end (232) is one end of the last stacked sub-diaphragm sheet (233).

16. The battery according to any one of claims 13 to 15, characterized in that The length of the battery is a, the width of the battery is b, the height of the battery is c, 2b≤a≤50b, and / or, 0.5c≤b≤20c; 400mm≤a≤2500mm.

17. A battery module, characterized in that: A battery comprising the battery according to any one of claims 13 to 16.

18. A battery pack, characterized in that: A battery comprising the battery according to any one of claims 13 to 16.

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