Battery module and electronic device

Abstract

The utility model discloses a battery assembly and electronic equipment. The battery assembly comprises a bearing part; the at least one battery unit group is fixed on the bearing part and comprises two battery units; the battery unit comprises a battery cell and a plastic package part wrapping the battery cell, and the plastic package part comprises a folded edge opposite to a first side wall of the battery cell in a first direction; the plane of the first side wall and the bearing part meets a vertical condition; wherein in the same battery unit group, the folded edges of the two battery units are constructed to be of a nested structure so as to reduce the size of the battery unit group in the first direction, and the first direction and the plane where the bearing part is located meet the condition that the first direction is parallel to the plane where the bearing part is located.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery assembly and an electronic device. Background Technology

[0002] The trend towards thinner and lighter designs for portable electronic devices is evident. Currently, the thickness of battery components, as key functional parts of electronic devices, is becoming increasingly critical. Therefore, reducing battery component size and increasing energy density are significant for improving the battery life and overall thinner design of electronic devices.

[0003] In existing battery modules, a large lateral distance is required between the cells for fixed packaging, resulting in a large battery module size and affecting the improvement of battery module energy density. Utility Model Content

[0004] In view of this, this application provides a battery assembly and an electronic device, the solution of which is as follows:

[0005] The first aspect of this application provides a battery assembly, comprising:

[0006] Load-bearing components;

[0007] At least one battery cell group is fixed on a carrier, the battery cell group includes two battery cells; the battery cell includes a cell and a plastic encapsulation covering the cell, the plastic encapsulation including a folded edge opposite to a first sidewall of the cell in a first direction; the first sidewall is perpendicular to the plane of the carrier.

[0008] In the same battery cell group, the folded edges of two battery cells are constructed as a nested structure to reduce the size of the battery cell group in the first direction, and the first direction is parallel to the plane where the support member is located.

[0009] Optionally, in the above-mentioned battery assembly, the battery cells in the same battery cell group are laid flat on the same side of the carrier.

[0010] Optionally, in the above-mentioned battery assembly, the battery cell includes a first surface and a second surface opposite to each other in a second direction; the second direction is perpendicular to the plane where the support member is located.

[0011] In the same battery cell, the folded edge includes a first bend and a second bend; the first end of the first bend is connected to the first surface, and the second end of the first bend extends toward the second surface based on the third surface opposite to the first sidewall of the battery cell; the first end of the second bend is connected to the second end of the first bend, and the second end of the second bend extends toward the first surface based on the outer side of the first bend; the second end of the second bend is located above the first surface.

[0012] Optionally, in the above-mentioned battery assembly, each battery cell is fixed relative to the carrier via a first surface; in the same battery cell group, there is a retaining wall between two adjacent battery cells; in the direction perpendicular to the second direction, the second end of the second bend has an overlapping area with the retaining wall to form a nested structure; the two battery cells are mirror symmetrical.

[0013] Optionally, in the above-mentioned battery assembly, in the same battery cell group, the two battery cells are a first battery cell and a second battery cell, the first surface of the first battery cell is fixed relative to the support member, the second surface of the second battery cell is fixed relative to the support member, and the two battery cells are centrally symmetrical.

[0014] In the second direction, the second end of the second bend in the first battery cell is opposite to the second end of the second bend in the second battery cell to form a nested structure.

[0015] Optionally, in the above-mentioned battery assembly, two battery cells in the same battery cell group are stacked on the same side of the carrier.

[0016] Optionally, in the above-mentioned battery assembly, the battery cell includes a first surface and a second surface opposite to each other in the second direction; a third surface and a fourth surface opposite to each other in the first direction; the third surface is parallel to and opposite to the first sidewall; and the second direction is perpendicular to the plane where the support member is located.

[0017] The folded edge in the battery cell that is opposite to the first sidewall is called the first folded edge. The first folded edge is connected to the first surface and is parallel to and opposite to the third surface. The length of the first folded edge is greater than the distance between the first surface and the second surface, so as to form a nested structure when the second surfaces of the two battery cells are arranged opposite each other.

[0018] Optionally, in the above-mentioned battery assembly, in the same battery cell group, the two battery cells are a first battery cell and a second battery cell, respectively; the first surface of the first battery cell is fixed relative to the carrier; the second surface of the second battery cell is fixed to the second surface of the first battery cell; the two battery cells are centrally symmetrical.

[0019] Optionally, in the above-mentioned battery assembly, the molding compound further includes a second folded edge that is parallel to and opposite to the fourth surface; the length of the second folded edge is greater than the distance between the first surface and the second surface, so as to form a nested structure when the second surfaces of the two battery cells are arranged opposite each other.

[0020] A second aspect of this application provides an electronic device including the aforementioned battery assembly. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0023] Figure 1 A schematic diagram of a battery module packaging structure;

[0024] Figure 2 This is a schematic diagram of the structure of a battery assembly provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of another battery assembly provided in an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of another battery cell provided in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of another battery assembly provided in an embodiment of this application;

[0029] Figure 7 This is a schematic diagram of another battery cell provided in an embodiment of this application;

[0030] Figure 8 This is a schematic diagram of another battery assembly provided in an embodiment of this application.

[0031] Figure label:

[0032] 11-Battery unit; 111-Cell; 112-Encapsulated component; 114-First sidewall; 113-Folded edge; 113a-First folded edge; 113b-Second folded edge; 12-Carrier component; 13-Block; 131-First part; 132-Second part; 141-First bend; 142-Second bend; 15-Nested structure; 16-Overlapping area; L-Lateral distance; S-Plane; S1-First surface; S2-Second surface; S3-Third surface; S4-Fourth surface; X-First direction; Y-Second direction. Detailed Implementation

[0033] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] Currently, the main approach in battery modules is to increase battery energy density so that sufficient capacity can be achieved in a smaller space. However, due to the thickness of the auxiliary materials and the design of the cell structure, there is a certain lower limit requirement for the cell thickness. In other words, limited by current materials and process conditions, the size of the encapsulated cell cannot be further compressed.

[0035] refer to Figure 1 , Figure 1 This is a schematic diagram of a battery assembly packaging structure. The battery assembly shown includes: a carrier 12; and a battery cell group fixed on the surface of the carrier 12, the battery cell group including two relatively fixed battery cells 11.

[0036] In the same battery cell group, the surface of the support member 12 between two battery cells 11 has a retaining wall 13, and the retaining wall 13 is fixed to the surface of the support member 12.

[0037] The battery cell 11 includes a battery cell 111, which is covered by a molding compound 112. Optionally, the molding compound 112 is generally a multi-layer aluminum-plastic film. To prevent electrolyte leakage and improve the structural stability of the battery cell 11, the molding compound 112 of the battery cell 11 has a folded edge 113, which fixes the battery cell 11 to the retaining wall 13. Moreover, the folded edge 113 can also reduce the risk of short circuit and prevent the internal metal layer of the molding compound from being exposed.

[0038] exist Figure 1In the illustrated configuration, the folded edge 113 of the battery cell 11 includes two bends on one side of the battery cell 11, and then one folded edge 113 of the battery cell 11 is glued and fixed to each of the two opposite vertical sides of the retaining wall 13. This configuration results in a large lateral distance L between the sides of two adjacent battery cells 11 with the folded edge 113. A large lateral distance L leads to a larger battery module volume and affects the improvement of the battery module's energy density.

[0039] In view of this, embodiments of this application provide a battery assembly, including:

[0040] Load-bearing components;

[0041] At least one battery cell group fixed on a carrier, the battery cell group including two battery cells; the battery cell including a cell and a plastic encapsulation covering the cell, the plastic encapsulation including a folded edge opposite to a first sidewall of the cell in a first direction; the first sidewall and the plane of the carrier satisfy the perpendicular condition, that is, the first sidewall is perpendicular or approximately perpendicular to the plane of the carrier.

[0042] In the same battery cell group, the folded edges of two battery cells are constructed as a nested structure to reduce the size of the battery cell group in the first direction. The first direction satisfies the parallel condition with the plane where the support is located, that is, the first direction is parallel or approximately parallel with the plane where the support is located.

[0043] As can be seen from the above description, in the battery assembly provided in this application embodiment, since the plastic encapsulation of the battery cell includes a folded edge opposite to the first sidewall, by designing the graphic structure of the folded edge, the two battery cells in the battery cell group can form a nested structure based on the folded edge of the plastic encapsulation, thereby reducing the size of the two battery cells in the battery cell group in the first direction. This can reduce the encapsulation fixing space between the battery cells in the battery cell group when the battery assembly is packaged, making it easier to reduce the volume of the battery assembly, so as to make an ultra-thin battery assembly, and also help to improve the battery capacity and energy density of the battery assembly.

[0044] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] refer to Figure 2 , Figure 2 This application provides a schematic diagram of the structure of a battery assembly, which includes:

[0046] Support component 12;

[0047] At least one battery cell group is fixed on the carrier 12. The battery cell group includes two battery cells 11. The battery cell 11 includes a cell 111 and a plastic sealant 112 covering the cell 111. The plastic sealant 112 includes a folded edge 113 opposite to the first sidewall 114 of the cell 111 in the first direction X. The first sidewall 114 and the plane of the carrier 12 satisfy the perpendicular condition, that is, the first sidewall 114 is perpendicular or approximately perpendicular to the plane S of the carrier 12.

[0048] In the same battery cell group, the folded edges 113 of two battery cells 11 are constructed as a nested structure 15 to reduce the size of the battery cell group in the first direction X, which is parallel to the direction in which the folded edge 113 of the battery cell 11 is opposite to the first sidewall 114. The first direction X and the plane S on which the support member 12 is located satisfy the parallel condition, that is, the first direction X and the plane S on which the support member 12 is located are parallel or approximately parallel.

[0049] In the battery assembly provided in this application embodiment, the battery unit 11 includes a folded edge 113 opposite to the first sidewall 114 of the cell 111. By designing the graphic structure of the folded edge 113, two battery units 11 in the battery unit group can form a nested structure 15 based on the folded edge 113 of the molding compound 112, so as to reduce the size of the two battery units 11 in the first direction X, which can reduce the packaging and fixing space between the battery units 11 in the battery unit group when the battery assembly is packaged, making it easier to reduce the volume of the battery assembly, so as to make an ultra-thin battery assembly, and also helps to improve the battery capacity and energy density of the battery assembly.

[0050] In one embodiment of this application, in the same battery cell group, battery cells 11 are laid flat on the same side surface of the support member 12, and the first sidewalls 114 of two cells 11 in the battery cell group are arranged opposite each other. In this method, all battery cells 11 can be laid flat on the same side surface of the support member 12, making all battery cells 11 coplanar, which facilitates the installation and fixing of the battery cells 11 on the surface of the support member 12. Furthermore, when the height of the battery cells 11 is constant, the lateral distance between two battery cells 11 in the first direction X can be reduced. Figure 2 The diagram shown is a schematic of a scheme in which the battery cell 11 is laid flat on the same side surface of the support member 12.

[0051] refer to Figure 3 , Figure 3This is a schematic diagram of a battery cell provided in an embodiment of this application. The battery cell 11 shown includes a first surface S1 and a second surface S2 that are opposite each other in a second direction Y. The second direction Y is perpendicular to the plane S on which the support member 12 is located, that is, the second direction Y is perpendicular or approximately perpendicular to the plane S on which the support member 12 is located. When the battery cell 11 is placed horizontally, the first surface S1 is the bottom surface of the battery cell 11, and the second surface S2 is the top surface of the battery cell 11.

[0052] In the same battery cell 11, the folded edge 113 includes a first bent portion 141 and a second bent portion 142; the first end 141a of the first bent portion 141 is connected to the first surface S1, and the second end 141b of the first bent portion 141 extends toward the second surface S2 based on the third surface S3 of the battery cell 11 opposite to the first sidewall 114; the first end 142a of the second bent portion 142 is connected to the second end 141b of the first bent portion 141, and the second end 142b of the second bent portion 142 extends toward the first surface S1 based on the outer side of the first bent portion 141. The second end 142b of the second bent portion 142 is located above the first surface S1.

[0053] Since the second end 142b of the second bend 142 is located above the first surface S1, the length of the second bend 142 is less than the length of the first bend 141. The second end 142b of the second bend 142 and the first bend 141 below it can form a groove. This groove is located on the outside of the folded edge 113, that is, on the side of the folded edge 113 away from the cell 111. The space of the groove located on the outside of the folded edge 113 can be used to form a nested structure. In this way, the space formed by the bending of the folded edge 113 can be used to form a nested structure, which improves the space utilization rate in the battery cell group and can reduce the size of the battery cell group in the first direction X, thereby reducing the size of the battery assembly in the first direction X.

[0054] If battery cell 11 has Figure 3 As shown by the folded edge 113, one embodiment of the battery assembly can be as follows: Figure 2 As shown. Combined with Figure 2 and Figure 3 As shown, two battery cells 11 in the same battery cell group are arranged in a mirror-symmetrical manner. Figure 2 In the XY plane shown, the two battery cells 11 are mirror-symmetric based on the vertical line between them.

[0055] like Figure 2 and Figure 3As shown, each battery cell 11 is fixed relative to the support member 12 via the first surface S1; in the same battery cell group, there is a retaining wall 13 between two adjacent battery cells 11; in the second direction Y, the second end 142b of the second bend 142 overlaps with the retaining wall 13 to form a nested structure 15.

[0056] The portion of the barrier 13 corresponding to the overlapping area 16 can be accommodated in the groove formed on the outer side of the folded edge 113, thereby accommodating the portions of the barrier 13 on opposite sides in the first direction X in the grooves formed on the folded edge 13 relative to the battery cell 11, thereby reducing the size of the battery cell assembly in the first direction X, and further reducing the size of the battery assembly in the first direction X.

[0057] When a nested structure 15 is formed based on the overlapping area 16 of the second end 142b of the second bend 142 and the retaining wall 13 in the second direction Y, the retaining wall 13 can be provided as follows: a first part 131 fixed to the surface of the support member 12; and a second part 132 located on the first part 131. In the first direction X, the width of the first part 131 is greater than the width of the second part 132, and the second part 132 is fixed to the middle area of ​​the top surface of the first part 131. Thus, in the first direction X, the opposite sides of the second part 132 can respectively form a stepped structure with the second part 132, and the two stepped structures can respectively fix the second bend 142 of an opposite battery cell 11. The second end 142b of the second bend 142 is fixed to the top surface of the first part 131 exposed in the platform structure, and the outer side of the second bend 142 is fixed to the opposite sidewall of the second part 132.

[0058] Optionally, the retaining wall 13 can be integrally formed with the carrier 12, or the two can be manufactured separately and then the retaining wall 13 can be fixed to the surface of the carrier 12. Both the retaining wall 13 and the carrier 12 can be frame adhesive.

[0059] Compared to Figure 1 The inwardly bent edge 113 is shown. Figure 2 In the manner shown, the folded edge 113 bends outwards. In this way, when the width of the battery cell 11 is the same in the first direction X, the lateral distance L can be reduced based on the overlapping area 16. If the second end 142b of the second bent portion 142 is completely located within the surface of the second portion 132, the lateral distance L can be reduced by 2A, where A is the thickness of the second bent portion in the first direction X.

[0060] The folded edge 113 is formed by two layers of 88μm aluminum-plastic film, and the thickness A of both the first bending portion 141 and the second bending portion 142 is 2*88μm. If... Figure 1 and Figure 2The middle battery cell 11 has the same size in the first direction X, relative to Figure 1 As shown, Figure 2 It can save the thickness of 4 layers of aluminum-plastic film in the first direction X, which can reduce the size of L to 4*88μm=0.35mm, increase the battery energy density by about 1%, and reduce the weight of the battery assembly.

[0061] In other methods, the height of the retaining wall 13 can also be equal to the distance between the second end 142b of the second bend 142 and the bearing member 12. In this case, the second ends 142b of the two second bends 142 can be directly opposite each other in the first direction X and respectively fixed to the top surface of the retaining wall 13. This method is relatively... Figure 2 In the configuration shown, the retaining wall 13 only has the lower first part 131.

[0062] In this embodiment, the second bent portion 142 of the folded edge 113 can be bonded and fixed to the corresponding stepped structure surface by an adhesive.

[0063] refer to Figure 4 , Figure 4 This is a schematic diagram of another battery assembly provided in an embodiment of this application. When using... Figure 3 When the battery cell 11 with the structure shown is used, the battery assembly can also be as follows: Figure 4 As shown.

[0064] Combination Figure 3 and Figure 4 As shown, in the same battery cell group, the two battery cells 11 are the first battery cell and the second battery cell, respectively. It can be set... Figure 4 The battery cell 11 on the left is the first battery cell, and the battery cell 11 on the right is the second battery cell. The first surface S1 of the first battery cell is fixed relative to the support member 12, and the second surface S2 of the second battery cell is fixed relative to the support member 12. In the second direction Y, the second end 142b of the second bend 142 in the first battery cell is opposite to the second end 142b of the second bend 142 in the second battery cell to form a nested structure 15.

[0065] Figure 4 In the arrangement shown, the two battery cells 11 are centrally symmetrical. In the XY plane, the two battery cells 11 are centrally symmetrical based on their contact positions at the second ends 142b of the two second bends 142.

[0066] Optionally, the second end 142b of the second bend 142 in the first battery cell and the second end 142b of the second bend 142 in the second battery cell can be fixed by adhesive bonding.

[0067] exist Figure 4In the battery assembly shown, the first battery cell and the second battery cell are centrally symmetrical and parallel to each other. In this method, there is no need to set a retaining wall 13 on the support member 12. A nested structure 15 can be formed based on the groove formed by the outward fold of the outer side of the folded edge 113. The two grooves formed on opposite sides of the outer side of the folded edge 113 in the first direction X can be directly nested in each other based on the centrally symmetrical structure, thereby significantly reducing the size of the battery cell assembly in the first direction X.

[0068] If the folded edge 113 is formed by two layers of 88μm aluminum-plastic film, Figure 4 The method shown can be used Figure 2 Based on the method shown, at least two layers of aluminum-plastic film thickness (the thickness of one second bend 142) can be saved, relative to Figure 1 As shown, Figure 4 By saving the thickness of 6 layers of aluminum-plastic film in the first direction X, the size of L can be reduced to 6*88μm = 0.528mm, the battery energy density can be increased by about 1.5%, and the weight of the battery assembly can also be reduced.

[0069] In another embodiment of this application, two battery cells 11 may be stacked on the same side of the support member 12 within the same battery cell group. In this method, based on the stacked arrangement of the two battery cells 11 in the battery cell group and the nested structure 15 formed by the folded edges 113 of the two battery cells 11, compared with the planar layout method, there is no need to set up a retaining wall 13, which can reduce the size of the battery cell group in the first direction X to a greater extent.

[0070] If two battery cells 11 are stacked on the same side of the support member 12 in the same battery cell group, in order to allow the folded edges 113 of the two stacked battery cells 11 to form a nested structure, the structure of the battery cell 11 can be as follows: Figure 5 As shown.

[0071] refer to Figure 5 , Figure 5 This is a schematic diagram of another battery cell structure provided in an embodiment of this application. The battery cell 11 shown includes a first surface S1 and a second surface S2 opposite to each other in the second direction Y; and a third surface S3 and a fourth surface S4 opposite to each other in the first direction X. As mentioned above, the second direction Y is perpendicular to the plane S where the support member 12 is located. The folded edge 113 opposite to the first sidewall 114 in the battery cell 11 is the first folded edge 113a. The first folded edge 113a is connected to the first surface S1 and is parallel to and opposite to the third surface S3. The length of the first folded edge 113a is greater than the distance between the first surface S1 and the second surface S2, so as to form a nested structure 15 when the second surfaces S2 of the two battery cells 11 are arranged opposite each other.

[0072] and Figure 3 The battery cell shown has a different structure with two bends at the fold edge 113. Figure 5 In the battery cell 11 shown, the folded edge 113 is bent only once. The folded edge is a straight line structure parallel to the third surface S3, and its length is greater than the distance between the first surface S1 and the second surface S2, so as to form a nested structure 15 when the second surfaces S2 of the two battery cells 11 are arranged opposite each other.

[0073] exist Figure 5 In the illustrated configuration, the thickness of the folded edge 113 in the first direction X can be 3 mm. Considering the tolerances during assembly when the two battery cells 11 are stacked, a set distance is provided between the folded edge 113 and the opposing surface of the battery cell 11. If the folded edge 113 is two layers of aluminum-plastic film, this set distance can also be the thickness of the two layers of aluminum-plastic film.

[0074] refer to Figure 6 , Figure 6 This is a schematic diagram of another battery assembly provided in an embodiment of the present application. In the same battery cell group of the battery assembly shown, the two battery cells 11 are the first battery cell and the second battery cell, respectively. Figure 6 The lower battery unit 11 can be the first battery unit, and the upper battery unit 11 can be the second battery unit.

[0075] Combination Figure 5 and Figure 6 As shown, the first surface S1 of the first battery cell is fixed relative to the support member 12; the second surface S2 of the second battery cell is fixed on the second surface S2 of the first battery cell; the two battery cells 11 are centrally symmetrical. Figure 6 As shown, in the XY plane, the two battery cells 11 are centrally symmetrical based on their relative center positions on the second surface S2.

[0076] exist Figure 6 In the manner shown, the second surfaces S2 of the two battery cells 11 can be bonded together with an adhesive layer.

[0077] refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of another battery cell provided in an embodiment of this application. Figure 8 This is a schematic diagram of another battery assembly provided in an embodiment of this application. Figure 5 and Figure 6 Based on the method shown, Figure 7 and Figure 8In the illustrated configuration, the molding compound 112 also includes a second folded edge 113b that is parallel to and opposite to the fourth surface S4; the length of the second folded edge 113b is greater than the distance between the first surface S1 and the second surface S2, so as to form a nested structure when the second surfaces S2 of the two battery cells 11 are arranged opposite each other.

[0078] In a conventional stacked battery cell assembly, battery cell 11 is typically disposed on the third surface S3 and the fourth surface S4 as follows: Figure 1 The middle battery cell 11 has a double-inwardly bent edge 113. Compared to a conventional stacked battery cell assembly, if the edge 113 is formed by two layers of 88μm aluminum-plastic film, Figure 8 The method shown is based on staggered folded edges 113, which can save the thickness of 4 layers of aluminum-plastic film in the first direction X. The size of the battery cell group in the first direction X is reduced by 4*88μm=0.35mm, the battery energy density can be increased by about 1%, and the weight of the battery assembly can also be reduced.

[0079] Compared to Figure 6 As shown, Figure 8 In the battery assembly shown, the two folded edges 113 in one battery cell 11 can be staggered with the two folded edges 113 in another battery cell 11 in the first direction X, thereby forming a more stable nested structure.

[0080] In the same battery cell 11, the distance H1 between the first folded edge 113a and the third surface S3 is not equal to the distance H2 between the second folded edge 113b and the fourth surface S4. For example... Figure 7 As shown, H1 is set to be greater than H2. In other methods, H1 can also be set to be less than H2. This allows for... Figure 8 As shown, in the same battery cell group, the two folded edges 113 of one battery cell 11 are staggered with the two folded edges 113 of another battery cell 11 in the first direction X.

[0081] As can be seen from the above description, in the battery assembly provided in this application embodiment, by optimizing the graphic structure of the folded edge 113 in the battery cell 11, a nested structure 15 can be formed based on the folded edge 113, which can produce a smaller battery assembly and also provide battery energy density.

[0082] Under the condition of fixed volume parameters, the battery module provided in this application embodiment can not only reduce the proportion of non-electrochemical active materials in the battery module, but also effectively utilize the internal space of the battery module, which can allow the production of larger-sized cells 111, thus improving the battery capacity and energy density.

[0083] In addition, the battery module provided in this application embodiment is highly compatible with existing battery module manufacturing processes. Only the bending pattern structure of the folded edge 113 needs to be adjusted, without changing other process steps of the battery module. The manufacturing process is simple, and the production and assembly of the battery module can be realized without introducing additional equipment, which is conducive to industrial production.

[0084] The manufacturing process of battery modules includes:

[0085] First, prepare the electrode paste.

[0086] Then, the electrode paste is coated onto the current collector.

[0087] Furthermore, the dried slurry is compacted through a roller pressing process.

[0088] Furthermore, the current collector with a slurry coating on its surface is divided into strip structures to prepare positive and negative electrode sheets.

[0089] Furthermore, the positive and negative electrode sheets are wound to form cell 111.

[0090] Furthermore, the hot-pressing process compresses and compacts the 111 battery cell.

[0091] Furthermore, the battery cell 111 is protected by encapsulation with a plastic encapsulator 112.

[0092] Furthermore, an electrolyte is injected into the encapsulated structure.

[0093] Furthermore, an impregnation treatment is performed to ensure that the electrolyte fully wets the electrode sheet.

[0094] Further, a chemical formation process is carried out.

[0095] Further, the exhaust process is carried out.

[0096] Furthermore, the encapsulated structure after venting is shaped and folded into an edge 113 to complete the fabrication of the battery cell 11.

[0097] Furthermore, the battery cell 11 is subjected to capacity determination and capacity division.

[0098] Finally, the performance and appearance of battery cell 11 are tested.

[0099] The battery assembly provided in this application embodiment only requires adjusting the graphic structure of the folded edge 113 in the process step of forming the folded edge 113, without adding any process steps or changing other process steps.

[0100] Based on the battery assembly provided in the above embodiments, another embodiment of this application also provides an electronic device, which includes the battery assembly provided in the above embodiments. The electronic device includes, but is not limited to, a laptop computer.

[0101] The various embodiments in this application are described in a progressive, parallel, or combined manner. Each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. The implementation methods provided in this application can be combined with each other without contradiction.

[0102] It should be noted that, in the description of this application, the accompanying drawings and embodiments are illustrative rather than restrictive. The same reference numerals throughout the embodiments identify the same structures. Additionally, for ease of understanding and description, the thicknesses of some layers, films, panels, regions, etc., may be exaggerated in the drawings. It is also understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, the element may be directly on the other element or there may be intermediate elements. Furthermore, "on" means positioning an element on or below another element, but does not inherently mean positioning it above another element according to the direction of gravity.

[0103] The terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the middle.

[0104] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0105] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery assembly, characterized in that, include: Load-bearing components; At least one battery cell group is fixed on the carrier, the battery cell group including two battery cells; the battery cell includes a cell and a plastic encapsulation covering the cell, the plastic encapsulation including a folded edge opposite to a first sidewall of the cell in a first direction; the first sidewall is perpendicular to the plane of the carrier. In the same battery cell group, the folded edges of two battery cells are constructed as a nested structure to reduce the size of the battery cell group in a first direction, which is parallel to the plane of the carrier.

2. The battery assembly according to claim 1, characterized in that, In the same battery cell group, the battery cells are laid flat on the same side of the carrier.

3. The battery assembly according to claim 2, characterized in that, The battery cell includes a first surface and a second surface that are opposite each other in a second direction; the second direction is perpendicular to the plane where the support member is located. In the same battery cell, the folded edge includes a first bend and a second bend; a first end of the first bend is connected to the first surface, and a second end of the first bend extends toward the second surface based on a third surface opposite to the first sidewall of the battery cell; a first end of the second bend is connected to the second end of the first bend, and a second end of the second bend extends toward the first surface based on the outer side of the first bend; the second end of the second bend is located above the first surface.

4. The battery assembly according to claim 3, characterized in that, The battery cells are all fixed relative to the support member via the first surface; in the same battery cell group, there is a retaining wall between two adjacent battery cells; in the direction perpendicular to the second direction, the second end of the second bend has an overlapping area with the retaining wall to form the nested structure; the two battery cells are mirror symmetrical.

5. The battery assembly according to claim 3, characterized in that, In the same battery cell group, the two battery cells are a first battery cell and a second battery cell, the first surface of the first battery cell is fixed relative to the support member, the second surface of the second battery cell is fixed relative to the support member, and the two battery cells are centrally symmetrical; In the second direction, the second end of the second bend in the first battery cell is opposite to the second end of the second bend in the second battery cell to form the nested structure.

6. The battery assembly according to claim 1, characterized in that, In the same battery cell group, two battery cells are stacked on the same side of the carrier.

7. The battery assembly according to claim 6, characterized in that, The battery cell includes a first surface and a second surface opposite each other in a second direction; a third surface and a fourth surface opposite each other in the first direction; the third surface is parallel to and opposite the first sidewall; the second direction is perpendicular to the plane where the support member is located. The folded edge in the battery cell that is opposite to the first sidewall is the first folded edge. The first folded edge is connected to the first surface and is parallel to and opposite to the third surface. The length of the first folded edge is greater than the distance between the first surface and the second surface, so as to form the nested structure when the second surfaces of the two battery cells are arranged opposite each other.

8. The battery assembly according to claim 7, characterized in that, In the same battery cell group, the two battery cells are a first battery cell and a second battery cell; the first surface of the first battery cell is fixed relative to the carrier; the second surface of the second battery cell is fixed on the second surface of the first battery cell; the two battery cells are centrally symmetrical.

9. The battery assembly according to claim 8, characterized in that, The molding compound also includes a second folded edge parallel to and opposite to the fourth surface; the length of the second folded edge is greater than the distance between the first surface and the second surface, so as to form the nested structure when the second surfaces of the two battery cells are arranged opposite each other.

10. An electronic device comprising a battery assembly as claimed in any one of claims 1-9.

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