Monomer battery and assembly method thereof

Abstract

The present application relates to the technical field of batteries, and discloses an electrode assembly, a single cell, and an assembly method for a single cell. The electrode assembly of the present application includes a pole terminal, a mounting member, and an adapter. The mounting member includes a mounting portion and an insulating portion. The mounting portion is provided with a first through hole, and the pole terminal passes through the through hole and protrudes from the outside of the mounting member through the first through hole. The adapter includes a base body and a plurality of connecting wings. The connecting wings on the adapter are erected at a set angle with respect to the base body toward the outside of the mounting member, which helps the connection of the tab and is convenient for folding. The tab is folded together with the connecting wing, thereby effectively reducing the occupied space of the tab and helping to improve the volumetric energy density of the single cell. In addition, during assembly, the connecting wing can be folded inward or outward according to the structural characteristics of the single cell and the actual assembly requirements, and is applicable to various assembly occasions. The single cell using the above electrode assembly also has the above advantages.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a single battery and an assembly method thereof. Background Art

[0002] As the main power source of electric vehicles, how to efficiently utilize the limited space and improve the energy density is the key to meeting the long-range requirements of new energy electric vehicles. At present, most power batteries use VDA cells or MEB model cells in groups, and this grouping method has a low volume space utilization rate and is difficult to efficiently utilize the internal space of the battery PACK. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides a single battery, which can effectively improve the volume space utilization rate of the single battery. This application also provides an assembly method of the single battery.

[0004] The electrode assembly according to the first aspect embodiment of this application includes:

[0005] A pole terminal;

[0006] A mounting member, including a mounting portion and an insulating portion. The mounting portion is provided with a first through hole, and the pole terminal passes through the through hole and protrudes from the outside of the mounting member through the first through hole;

[0007] An adapter, including a base body and a plurality of connecting wings. The base body is connected to the insulating portion, and the base body extends to the mounting portion and is electrically connected to the pole terminal. The connecting wings are erected at a set angle relative to the base body toward the outside of the mounting member and can be folded relative to the base body. The connecting wings are used for electrically connecting to the tab of the bare cell.

[0008] The electrode assembly according to the first aspect embodiment of this application has at least the following beneficial effects: The connecting wings on the adapter are erected at a set angle relative to the base body toward the outside of the mounting member and can be folded relative to the base body. The connecting wings are electrically connected to the tab of the bare cell. The connecting wings erected at a set angle toward the outside of the mounting member contribute to the connection of the tab, and are convenient for folding. The tab is folded together with the connecting wings, thereby effectively reducing the occupied space of the tab, and thus contributing to improving the volume energy density of the single battery. In addition, during assembly, the connecting wings can be folded inward or outward according to the structural characteristics (such as thickness) of the single battery and the actual assembly requirements, and are applicable to various assembly occasions.

[0009] According to some embodiments of this application, the adapter includes a pair of the connecting wings, the connecting wings are symmetrically arranged on both sides of one end of the base body, and the other end of the base body is electrically connected to the pole terminal.

[0010] According to some embodiments of the present application, the insulating portion covers the outer side of a portion of the base body located between the connecting wings.

[0011] According to some embodiments of the present application, the adapter includes a pair of connecting wings, which are respectively arranged on opposite sides of both ends of the base, and the middle part of the base is electrically connected to the pole terminal.

[0012] According to some embodiments of the present application, the insulating portion covers the outer side of a portion of the base corresponding to the connecting wing.

[0013] According to some embodiments of the present application, a clearance portion for the connecting wing to pass through is provided on the insulating portion.

[0014] According to the second aspect of the present application, a single cell includes:

[0015] The electrode assembly of the first embodiment;

[0016] A bare cell, comprising a positive electrode ear and a negative electrode ear, wherein the positive electrode ear and / or the negative electrode ear is electrically connected to the connecting wing and is folded along with the connecting wing to the outside of the substrate or the outside of the end of the bare cell;

[0017] A shell having an inner cavity and an opening for the bare battery core to enter the inner cavity, wherein the bare battery core is placed in the inner cavity;

[0018] A top cover plate is sealed on the opening of the shell and connected to the shell, and the top cover plate is provided with a second through hole for the pole terminal to pass through.

[0019] According to some embodiments of the present application, the positive electrode ear and the negative electrode ear are arranged at opposite ends of the bare battery cell, the shell has the openings at both ends corresponding to the positive electrode ear and the negative electrode ear, the positive electrode ear and the negative electrode ear are electrically connected to the corresponding connecting wings, and are folded along the connecting wings to the outside of the base or the outside of the end of the bare battery cell.

[0020] According to some embodiments of the present application, the single cell includes two bare cells, the positive pole ears of the two bare cells face the same end, and the negative pole ears face the other end relative to the positive pole ears; the two ends of the bare cells are respectively connected to the electrode assemblies, and the adapter of the electrode assembly includes two connecting wings; the connecting wings located at one end of the positive pole ear are respectively electrically connected to the positive pole ear, and the connecting wings located at one end of the negative pole ear are respectively electrically connected to the negative pole ear.

[0021] According to some embodiments of the present application, the positive electrode tab is folded inwards with the connecting wing to the outside of the substrate, or folded outwards to the outside of the end of the bare battery cell; the negative electrode tab is folded inwards with the connecting wing to the outside of the substrate, or folded outwards to the outside of the end of the bare battery cell.

[0022] The assembly method of the single battery according to the third aspect embodiment of the present application includes the following steps:

[0023] Prepare the electrode assembly, bare battery cell, housing and top cover plate in the single battery according to the second aspect embodiment of the present application;

[0024] Electrically connect the positive electrode tab and / or negative electrode tab of the bare battery cell to the connecting wing on the adapter of the electrode assembly, and fold and flatten them outwards or inwards together with the connecting wing to form an electrode assembly and bare battery cell assembly;

[0025] On the electrode assembly and bare battery cell assembly, an insulating member is provided corresponding to the position of the electrode tab and the outer circumference of the bare battery cell, and then it is placed into the inner cavity of the housing. The electrode assembly is located at the opening, and the top cover plate is sealed to the opening and connected to the housing and / or the mounting member.

[0026] According to some embodiments of the present application, for the single battery including two bare battery cells, prepare two electrode assemblies with two connecting wings. When assembling the electrode assembly and bare battery cell assembly: place the positive electrode tabs of the two bare battery cells at the same end, and the negative electrode tabs face the other end relative to the positive electrode tabs, and then make the two bare battery cells abut against each other; connect the two electrode assemblies to both ends of the bare battery cell respectively, wherein each positive electrode tab corresponds to each connecting wing located at the end of the positive electrode tab, and each negative electrode tab corresponds to each connecting wing located at the end of the negative electrode tab; electrically connect each positive electrode tab to the corresponding connecting wing and fold and flatten them outwards or inwards together, and electrically connect each negative electrode tab to the corresponding connecting wing and fold and flatten them outwards or inwards together to form an electrode assembly and bare battery cell assembly.

[0027] The additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. Description of the Drawings

[0028] The following further describes the present application in conjunction with the drawings and embodiments, where:

[0029] Figure 1 It is a schematic perspective view of the three-dimensional structure of the single battery according to an embodiment of the present application;

[0030] Figure 2 isFigure 1 Partial structural decomposition schematic diagram of the single cell of the illustrated embodiment;

[0031] Figure 3 is Figure 1 Cross-sectional view of the single cell of the illustrated embodiment at A-A;

[0032] Figure 4 is Figure 1 Cross-sectional view of the single cell of the illustrated embodiment at B-B;

[0033] Figure 5 is Figure 3 Partial enlarged view of the single cell of the illustrated embodiment at C;

[0034] Figure 6 is Figure 4 Partial enlarged view of the single cell of the illustrated embodiment at D;

[0035] Figure 7 Schematic diagram of the bare cell (tab not folded) and the electrode assembly of the single cell of an embodiment of the present application;

[0036] Figure 8 is Figure 7 Cross-sectional view of the single cell of the illustrated embodiment at E-E;

[0037] Figure 9 is Figure 8 Partial detailed schematic diagram of the single cell of the illustrated embodiment at F;

[0038] Figure 10 is Figure 8 Schematic diagram of the state where the connecting wing of the single cell of the illustrated embodiment is folded outwards;

[0039] Figure 11 is Figure 8 Schematic diagram of the state where the connecting wing of the single cell of the illustrated embodiment is folded inwards;

[0040] Figure 12 Schematic diagram of the structure of the electrode assembly of an embodiment of the present application;

[0041] Figure 13 For the present application Figure 12 Bottom view of the electrode assembly of the illustrated embodiment;

[0042] Figure 14 Schematic diagram of the structure of the adapter in the electrode assembly of an embodiment of the present application;

[0043] Figure 15 Schematic diagram of the structure of the adapter in the electrode assembly of another embodiment of the present application;

[0044] Figure 16Schematic diagram of the adapter in the electrode assembly of another embodiment of the present application;

[0045] Figure 17 Schematic diagram of the connection between the electrode assembly and the bare cell in the single cell of one embodiment of the present application;

[0046] Figure 18 is Figure 17 Schematic diagram of the state where the connection wing is folded inward in the single cell of the illustrated embodiment;

[0047] Figure 19 Schematic diagram of the connection between the electrode assembly and the bare cell in the single cell of another embodiment of the present application;

[0048] Figure 20 is Figure 19 Schematic diagram of the state where the connection wing is folded outward in the single cell of the illustrated embodiment;

[0049] Figure 21 Schematic diagram of the assembly process of the bare cell and the electrode assembly in the assembly method of the single cell of the embodiment of the present application;

[0050] Figure 22 Schematic diagram of the assembly process of the first insulating member in the assembly method of the single cell of the embodiment of the present application;

[0051] Figure 23 Schematic diagram after the assembly of the first insulating member is completed in the assembly method of the single cell of the embodiment of the present application;

[0052] Figure 24 Schematic diagram of the assembly process of the second insulating member in the assembly method of the single cell of the embodiment of the present application;

[0053] Figure 25 Schematic diagram after the assembly of the second insulating member is completed in the assembly method of the single cell of the embodiment of the present application;

[0054] Figure 26 Schematic diagram of the assembly process of the top cover plate in the assembly method of the single cell of the embodiment of the present application.

[0055] Reference numerals:

[0056] Housing 100, top cover plate 200, second through hole 210, first insulating member 300, electrode assembly 400,

[0057] Adapter 410, connection wing 411, base body 412, mounting member 420, mounting portion 421,

[0058] Insulating portion 422, first through hole 423, relief portion 424, pole terminal 430,

[0059] The second insulating member 500, the bare battery cell 600, the positive electrode tab 610, and the negative electrode tab 620. Detailed implementation manners

[0060] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application.

[0061] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0062] In the description of the present application, the meaning of several is more than one, and understanding of above, below, within, etc. includes the present number. If there is a description of first, second, etc., it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0063] In the description of the present application, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0064] In the description of the present application, the description referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0065] Figure 1 It is a three-dimensional structure schematic diagram of a single battery cell of an embodiment of the present application. Figure 2 is Figure 1 a partial structure decomposition schematic diagram of the single battery cell of the illustrated embodiment. Figure 3 is Figure 1 a cross-sectional view taken along line A-A of the single battery cell of the illustrated embodiment. Figure 4 is Figure 1A cross-sectional view of a single cell of the embodiment shown at BB, Figure 5 for Figure 3 A partial enlarged view of point C in the middle. Figure 6 for Figure 4 A partial enlarged view of point D in the middle.

[0066] The present application embodiment provides a single battery, referring to Figures 1 to 6 The single cell includes an electrode assembly 400, a bare cell 600, a shell 100, a first insulating member 300, a second insulating member 500 and a top cover plate 200. The bare cell 600 has a positive electrode ear 610 and a negative electrode ear 620 facing both ends, respectively. The positive electrode ear 610 and the negative electrode ear 620 are respectively connected to the electrode assembly 400. The first insulating member 300 is connected to the electrode assembly 400, and the second insulating member 500 is coated on the outer periphery of the bare cell 600 and the mounting member 420. The shell 100 has an inner cavity and an opening for the bare cell 600 to enter the inner cavity. The bare cell 600 is placed in the inner cavity. The top cover plate 200 covers the opening of the shell 100 and is connected to the shell 100 and / or the electrode assembly 400.

[0067] In the single cell of this embodiment, the electrode assembly 400 includes a pole terminal 430, a mounting member 420 and an adapter 410, wherein the mounting member 420 includes a mounting portion 421 and an insulating portion 422, the mounting portion 421 is provided with a first through hole 423, the pole terminal 430 is passed through the through hole and protrudes from the first through hole 423 to the outside of the mounting member 420. The adapter 410 includes a base 412 and a plurality of connecting wings 411, the base 412 is connected to the insulating portion 422 and the base 412 is electrically connected to the pole terminal 430, the connecting wings 411 and the base 412 stand upright toward the outside of the mounting member 420 at a set angle, and can be folded relative to the base 412, the connecting wings 411 are electrically connected to the pole ears of the bare battery cell, and can be connected and fixed by ultrasonic welding. The top cover plate 200 is provided with a second through hole 210 for the pole terminal 430 to pass through, thereby enabling the electrical energy inside the shell 100 to be conducted out.

[0068] Among them, the first insulating member 300 is connected to the mounting member 420 or the top cover plate 200 corresponding to the connection wing 411 and the tab position. The first insulating member 300 can be an insulating bracket or an insulating patch, which can be connected to the insulating portion 422 by snap connection or bonding. The second insulating member 500 can be a Mylar film, which is coated on the outer periphery of the bare cell 600 and the mounting member 420, thereby achieving effective insulation of the bare cell 600 and the tab. The angle between the connection wing 411 and the base 412 can be set to an angle that facilitates the tab to be gathered and the connection wing 411 to be folded. In specific implementation, any angle between 30° and 150° can be selected according to the actual assembly requirements, such as 30°, 60°, 90°, 120°, 150°, etc.

[0069] Figure 7Schematic diagram of the bare cell (tab not folded) and the electrode assembly of a single cell according to an embodiment of the present application. Figure 8 is Figure 7 Cross-sectional view of the single cell at C-C of the embodiment shown. Figure 9 is Figure 8 Partial detail diagram of the D part of the single cell of the embodiment shown. Figure 10 is Figure 9 Schematic diagram of the state where the connecting wing of the single cell of the embodiment shown is folded outwards. Figure 11 is Figure 9 Schematic diagram of the state where the connecting wing of the single cell of the embodiment shown is folded inwards.

[0070] Referring to Figures 7 to 11 , in the single cell of the embodiment of the present application, the positive tab 610 and the negative tab 620 of the bare cell 600 are arranged at opposite ends, the housing 100 has openings at both ends corresponding to the positive tab 610 and the negative tab 620, electrode assemblies 400 are connected to both ends of the bare cell 600 corresponding to the positive tab 610 and the negative tab 620, and both the positive tab 610 and the negative tab 620 are electrically connected to the corresponding connecting wings 411. Referring to Figure 10 , the positive tab 610 and the negative tab 620 are folded inwards with the connecting wing 411, so that the tabs are folded outside the base body 412; referring to Figure 11 , the positive tab 610 and the negative tab 620 are folded outwards with the connecting wing 411, so that they are folded outside the end of the bare cell 600. Thus, electrical connection between the tabs and the terminal posts 430 can be achieved, the tabs are easy to be bundled and welded, and a relatively large operating space can be reserved, which is convenient for the welding operation of the tabs and the connecting wings 411. The tabs are in order and there is no excessive redundancy, and the occupied space of the tabs can be saved after folding and flattening, thereby improving the volume energy density of the single cell.

[0071] The folding direction of the above-mentioned connecting wing 411 can be reasonably selected according to the thickness of the bare cell 600. For example, for a relatively thin bare cell 600, the distance between the tabs and the edge of the bare cell 600 is small, and the scheme of folding the connecting wing 411 inwards can be adopted; for a relatively thick bare cell 600, the distance between the tabs and the edge of the bare cell 600 is large, and the scheme of folding the connecting wing 411 outwards can be adopted, so as to be applicable to bare cells 600 with different thicknesses and realize a single cell with high energy density.

[0072] At present, most power batteries use VDA or MEB model cells for grouping. This grouping method has a low utilization rate of volume space and is difficult to efficiently utilize the limited internal space of the battery PACK. In related technologies, in order to adapt to the space of the passenger car battery PACK, a structure form of double-pass cells is adopted, and the two pole column terminals are arranged at both ends of the cell head and tail. By increasing the length of the cell and reducing the width, it can better adapt to the space of the passenger car battery PACK. However, this assembly method of double-pass cells is to first bundle the bare cells, wrap them with an insulating film, then install them in the housing, and then connect the bare cell tabs to the top cover at both ends of the head and tail respectively, and then fit the top cover with the head and tail of the aluminum shell and weld it for sealing. This assembly method has great disadvantages: 1. It is difficult to operate when the bare cell is inserted into the housing and then connected to the top cover. There is insufficient space, making it difficult to weld, remove dust, and effectively insulate the bare cell, tab, and conductive components; 2. The utilization rate of the height space is extremely low, and it is difficult to improve the volume energy density; 3. The cost is high; 4. The utilization rate of the aluminum shell material is low.

[0073] Compared with the above solution, the embodiment of the present application uses an electrode assembly to connect with the bare cell tab to form an independent pole column structure. During assembly, the electrode assembly can be assembled first, and then the bare cell is assembled with the two electrode assemblies into one body, a first insulating member 300 is added, a second insulating member 500 is wrapped, and then the top cover plate 200, the electrode assembly 400, the assembly of the bare cell 600, and the housing 100 are assembled and sealed together. With the structure of the single battery in the embodiment of the present application, the assembly is simple and convenient, which is conducive to automation. Effective insulation protection is achieved through the assembled parts; the tab welding has great flexibility, a large operating space can be reserved, which is convenient for operation, and there are various derivative methods. For bare cells with different thicknesses and widths, they can be well compatible after fine-tuning, thereby effectively improving the space utilization rate and increasing the volume energy density. The specific assembly method will be described in detail later.

[0074] Refer to Figures 7 to 11In the illustrated embodiment, the single cell of the embodiment of the present application includes two bare battery cells 600. The positive electrode tabs 610 of the two bare battery cells 600 face the same end, and the negative electrode tabs 620 face the other end relative to the positive electrode tabs 610. Electrode assemblies 400 are respectively connected to both ends of the bare battery cell 600. The adapter 410 of the electrode assembly 400 includes two connecting wings 411 (the specific structure will be described in detail in subsequent embodiments). The connecting wings 411 located at one end of the positive electrode tab 610 are respectively electrically connected to the positive electrode tab 610, and the connecting wings 411 located at one end of the negative electrode tab 620 are respectively electrically connected to the negative electrode tab 620. The positive electrode tab 610 and the negative electrode tab 620 are folded and flattened along with the connecting wings 411. The first insulating member 300 is connected to the mounting member 420 and / or the housing 100, and the second insulating member 500 covers the outer peripheries of the bare battery cell 600 and the mounting member 420 to achieve insulated installation. The housing 100 has an inner cavity and an opening for the bare battery cell 600 to enter the inner cavity. The bare battery cell 600 is placed in the inner cavity, and the top cover plate 200 seals the opening of the housing 100 and is connected to the housing 100 and / or the electrode assembly 400, thereby forming a dual-pass single cell with high energy density. When assembling the dual-pass single cell based on the structure of the above embodiment, the electrode assemblies 400 of the two bare battery cells 600 can be assembled outside the housing 100, and the electrode tabs of the bare battery cell 600 can be welded through the connecting wings 411 of the adapter 410, and then the whole is passed through the top cover plate 200 of the housing 100. Since the welding of the electrode tabs is not restricted by the housing 100, there is a large operating space, solving the problems of insufficient operating space for welding the electrode tabs of the conventional dual-pass single cell and difficult welding. Moreover, different folding schemes of the connecting wings 411 can be adopted to be applicable to bare battery cells 600 with different thicknesses, especially applicable to thick batteries. When the bare battery cell 600 is relatively thick, a scheme of folding the connecting wings 411 outward after welding the electrode tabs can be adopted, thereby realizing a single cell with high energy density. On the premise of the same battery energy requirement, the number of single cells can be reduced, and correspondingly, the number of the housings 100 will also be reduced, thereby reducing the material utilization rate of the housing 100 and the occupation of the internal space of the battery by the housing.

[0075] In the above embodiment, according to the structure and assembly requirements of the single cell, the folding directions of the positive electrode tab 610 and the negative electrode tab 620 along with the connecting wings 411 can be the same or different. For example: the positive electrode tab 610 is folded inward along with the connecting wings 411 outside the base body 412, and the negative electrode tab 620 is folded inward along with the connecting wings 411 outside the base body 412; or, the positive electrode tab 610 is folded outward along with the connecting wings 411 outside the end of the bare battery cell 600, and the negative electrode tab 620 is folded inward along with the connecting wings 411 outside the base body 412; or, the positive electrode tab 610 is folded inward along with the connecting wings 411 outside the base body 412, and the negative electrode tab 620 is folded outward along with the connecting wings 411 outside the end of the bare battery cell 600.

[0076] In some embodiments of the present application, only one of the positive electrode ear 610 and the negative electrode ear 620 at both ends of the bare battery cell 600 can be selected to be connected to the electrode assembly 400. For example, the electrode assembly 400 is set at one end of the bare battery cell 600, which can be one end of the positive electrode ear 610 (or the negative electrode ear 620). The positive electrode ear 610 (or the negative electrode ear 620) is electrically connected to the connecting wing 411 and is folded along the connecting wing 411 to the outside of the substrate 412 or the outside of the end of the bare battery cell 600; the other end can adopt a conventional electrode ear connection scheme.

[0077] Figure 12 is a schematic structural diagram of an electrode assembly according to an embodiment of the present application, Figure 13 For this application Figure 12 Bottom view of the electrode assembly of the illustrated embodiment, with reference to Figure 12 and Figure 13 The embodiment of the present application provides an electrode assembly 400, including a pole terminal 430, a mounting member 420 and an adapter 410, wherein the mounting member 420 includes a mounting portion 421 and an insulating portion 422, the mounting portion 421 is provided with a first through hole 423, the pole terminal 430 is passed through the through hole and protrudes from the outside of the mounting member 420 from the first through hole 423. The adapter 410 includes a base 412 and a plurality of connecting wings 411, the base 412 is connected to the insulating portion 422, and the base 412 is electrically connected to the pole terminal 430. The base 412 and the insulating portion 422 can be connected by screws. The adapter 410 is used to electrically connect to the pole ear of the bare battery cell 600, thereby enabling the electric energy to be drawn out through the pole terminal 430.

[0078] The connecting wing 411 on the adapter 410 stands at a set angle with the base 412 toward the outside of the mounting member 420, and can be folded relative to the base 412. The connecting wing 411 is electrically connected to the pole ear of the bare battery cell 600. The connecting wing 411 standing at a set angle toward the outside of the mounting member 420 helps connect the pole ear, and is easy to fold. The pole ear folds together with the connecting wing 411, thereby effectively reducing the space occupied by the pole ear, thereby helping to improve the volume energy density of the single cell. In addition, during assembly, the connecting wing 411 can be folded inward or outward according to the structural characteristics (such as thickness) of the single cell and the actual assembly requirements, which is suitable for a variety of assembly occasions.

[0079] In the above embodiment, a clearance portion 424 is provided on the insulating portion 422 of the mounting member 420 for the connecting wing 411 and the pole ear to pass through. The clearance portion 424 can be a through hole provided on the insulating portion 422 of the mounting member 420, or the insulating portion 422 of the mounting member 420 can be directly cut off from the side edge to form a clearance gap, so as to facilitate the bare battery cell 600 together with the pole ear to be loaded from the side of the mounting member 420.

[0080] Figure 14The structural schematic diagram of the adapter in the electrode assembly according to an embodiment of the present application. Refer to Figure 14 , in the electrode assembly of this embodiment, the adapter 410 includes two connecting wings 411, which are symmetrically arranged on both sides of one end of the base body 412. The other end of the base body 412 is electrically connected to the pole terminal 430. It can be seen from the above embodiment that the adapter 410 of this embodiment is applicable to the case where two bare battery cells 600 are assembled in a single battery cell. The positive tabs 610 of the two bare battery cells 600 face the same end and are opposite in position, corresponding to being on the same side of the pole terminal 430. The negative tabs 620 face the other end relative to the positive tabs 610 and are opposite in position, corresponding to being on the same side of the pole terminal 430. During assembly, electrode assemblies 400 are respectively arranged at both ends of the bare battery cell 600. The two connecting wings 411 of the adapter 410 at the end where the positive tabs 610 are located are respectively electrically connected to the two positive tabs 610, and the two connecting wings 411 of the adapter 410 at the end where the negative tabs 620 are located are respectively electrically connected to the two negative tabs 620. The positive tabs 610 and the negative tabs 620 are folded and flattened along the corresponding connecting wings 411, so as to realize the connection between the tabs and the electrode assembly 400. In this embodiment, the insulating part 422 covers the outside of the part of the base body 412 between the connecting wings 411.

[0081] Figure 15 The structural schematic diagram of the adapter in the electrode assembly according to another embodiment of the present application. Refer to Figure 15 , different from the adapter 410 in the above embodiment, in the electrode assembly of this embodiment, the two connecting wings 411 of the adapter 410 are respectively arranged on the opposite sides of both ends of the base body 412, and the middle part of the base body 412 is electrically connected to the pole terminal 430. This embodiment is also applicable to a single battery cell with two bare battery cells 600 and the tabs are staggered from each other. The positive tabs 610 of the two bare battery cells 600 face the same end and are staggered from each other on both sides of the pole terminal 430. The negative tabs 620 face the other end relative to the positive tabs 610 and are staggered from each other on both sides of the pole terminal 430. During assembly, electrode assemblies 400 are respectively arranged at both ends of the bare battery cell 600. The two connecting wings 411 of the adapter 410 at the end where the positive tabs 610 are located are respectively electrically connected to the two positive tabs 610, and the two connecting wings 411 of the adapter 410 at the end where the negative tabs 620 are located are respectively electrically connected to the two negative tabs 620. The positive tabs 610 and the negative tabs 620 are folded and flattened along the corresponding connecting wings 411, so as to save the space occupied by the tabs.

[0082] Figure 16 The structural schematic diagram of the adapter in the electrode assembly according to another embodiment of the present application. Refer to Figure 16, different from the adapter 410 in the above embodiments, in the electrode assembly of this embodiment, one end of the base body 412 of the adapter 410 is electrically connected to the pole terminal 430, and the other end is provided with a connecting wing 411 and is connected to the insulating portion 422 of the mounting member 420. The electrode assembly 400 of this embodiment is applicable to the single-cell battery having the single-piece bare electric core 600 in the above embodiment. The connecting wing 411 can be folded inwards or outwards according to the structural characteristics and assembly requirements of the single-cell battery, and has flexible adaptability.

[0083] Figure 17 Schematic diagram of the connection between the electrode assembly and the bare electric core in a single-cell battery according to an embodiment of the present application, Figure 18 is Figure 17 Schematic diagram of the state where the connecting wing is folded inwards in the single-cell battery of the illustrated embodiment, Figure 19 Schematic diagram of the connection between the electrode assembly and the bare electric core in a single-cell battery according to another embodiment of the present application, Figure 20 is Figure 19 Schematic diagram of the state where the connecting wing is folded outwards in the single-cell battery of the illustrated embodiment.

[0084] Refer to Figures 17 to 20 , in the single-cell battery of some embodiments of the present application, the single-cell battery can have a structure with a single-piece bare electric core 600. At this time, only one connecting wing 411 can be provided on the adapter 410 of the electrode assembly 400 (such as Figure 16 the illustrated embodiment). Similar to the single-cell battery with the double bare electric core 600 structure above, the positive electrode tab 610 and the negative electrode tab 620 of the bare electric core 600 in this embodiment are arranged at opposite ends, and the housing 100 has openings at both ends corresponding to the positive electrode tab 610 and the negative electrode tab 620. Both ends of the bare electric core 600 corresponding to the positive electrode tab 610 and the negative electrode tab 620 are connected with the electrode assembly 400, and the positive electrode tab 610 and the negative electrode tab 620 are both electrically connected to the corresponding connecting wing 411. Refer to Figure 17 and Figure 18 , the positive electrode tab 610 and the negative electrode tab 620 are folded inwards with the connecting wing 411, so that the electrode tabs are flattened on the outside of the base body 412; refer to Figure 19 and Figure 20 , the positive electrode tab 610 and the negative electrode tab 620 are folded outwards with the connecting wing 411, so that they are flattened on the outside of the end of the bare electric core 600.

[0085] The folding direction of the above connecting wing 411 can be reasonably selected according to the thickness of the bare electric core 600. For example, for the relatively thin bare electric core 600, the distance between the electrode tab and the edge of the bare electric core 600 is small, and the scheme of folding the connecting wing 411 inwards can be adopted; for the relatively thick bare electric core 600, the distance between the electrode tab and the edge of the bare electric core 600 is large, and the scheme of folding the connecting wing 411 outwards can be adopted, so as to be applicable to bare electric cores 600 of different thicknesses and realize a single-cell battery with high energy density.

[0086] The embodiment of the present application further provides an assembly method for a single cell. Refer to Figures 21 to 26 , Figure 21 which is a schematic diagram of the assembly process of the bare cell 600 and the electrode assembly 400 in the assembly method of the single cell according to the embodiment of the present application, Figure 22 which is a schematic diagram of the assembly process of the first insulating member in the assembly method of the single cell according to the embodiment of the present application, Figure 23 which is a schematic diagram after the first insulating member is assembled in the assembly method of the single cell according to the embodiment of the present application, Figure 24 which is a schematic diagram of the assembly process of the second insulating member in the assembly method of the single cell according to the embodiment of the present application, Figure 25 which is a schematic diagram after the second insulating member is assembled in the assembly method of the single cell according to the embodiment of the present application, Figure 26 which is a schematic diagram of the assembly process of the top cover plate in the assembly method of the single cell according to the embodiment of the present application.

[0087] The assembly method of the single cell according to the embodiment of the present application includes the following steps:

[0088] Prepare the electrode assembly 400, the bare cell 600, the housing 100, the first insulating member 300, the second insulating member 500, and the top cover plate 200 in the single cell of the above embodiment. Among them, each component of the electrode assembly 400 is pre-assembled into an assembly: the mounting member 420 is sleeved on the pole terminal 430 through the first through hole 423, so that the pole terminal 430 extends out of the outside of the mounting member 420, and the connecting wing 411 of the adapter 410 extends out towards the outside of the mounting member 420 and the adapter 410 is connected to the insulating portion 422 of the mounting member 420, and a screw connection or a glue nail connection method can be adopted.

[0089] Electrically connect the positive electrode tab 610 and / or the negative electrode tab 620 of the bare cell 600 to the connecting wing 411 on the adapter of the electrode assembly 400, and turn them outwards or inwards and flatten them together with the connecting wing 411 to form an assembly of the electrode assembly and the bare cell. Through the connection of the adapter and the electrode tab, the electrode tab is easy to be bundled and welded, and a relatively large operation space can be reserved, which is convenient for the welding operation of the electrode tab and the connecting wing 411, and the electrode tabs are orderly and there is no excessive redundancy.

[0090] Among them, only one of the positive electrode tab 610 and the negative electrode tab 620 at both ends of the bare battery cell 600 can be selected to be connected to the electrode assembly 400. For example, the electrode assembly 400 can be provided at one end of the bare battery cell 600, which can be one end of the positive electrode tab 610 (or the negative electrode tab 620). The positive electrode tab 610 (or the negative electrode tab 620) is electrically connected to the connection wing 411 and is folded over the outside of the base body 412 or the outside of the end of the bare battery cell 600 along with the connection wing 411. The other end can adopt a conventional tab connection scheme. The folding direction of the connection wing 411 can be reasonably selected according to the thickness of the bare battery cell 600. For example, for a relatively thin bare battery cell 600, the distance between the tab and the edge of the bare battery cell 600 is small, and the connection wing 411 can be folded inward; for a relatively thick bare battery cell 600, the distance between the tab and the edge of the bare battery cell 600 is large, and the connection wing 411 can be folded outward, so as to be applicable to bare battery cells 600 of different thicknesses and realize a single battery with high energy density.

[0091] For a single battery in which both the positive electrode tab 610 and the negative electrode tab 620 are connected to the above-mentioned electrode assembly 400, according to the structure of the single battery and the requirements of assembly, the folding directions of the positive electrode tab 610 and the negative electrode tab 620 along with the connection wing 411 can be the same or different. For example: the positive electrode tab 610 is folded inward along with the connection wing 411 to the outside of the base body 412, and the negative electrode tab 620 is folded inward along with the connection wing 411 to the outside of the base body 412; or, the positive electrode tab 610 is folded outward along with the connection wing 411 to the outside of the end of the bare battery cell 600, and the negative electrode tab 620 is folded inward along with the connection wing 411 to the outside of the base body 412; or, the positive electrode tab 610 is folded inward along with the connection wing 411 to the outside of the base body 412, and the negative electrode tab 620 is folded outward along with the connection wing 411 to the outside of the end of the bare battery cell 600.

[0092] On the electrode assembly and the bare battery cell assembly, insulating parts are provided at positions corresponding to the positive electrode tab 610 and the negative electrode tab 620 and on the outer periphery of the bare battery cell 600, and then they are placed into the inner cavity of the housing 100. The electrode assembly 400 is located at the opening. The top cover plate 200 is sealed to the opening and connected to the housing 100 and / or the mounting part 420. When setting the insulating parts, the first insulating part 300 and the second insulating part 500 can be configured. During assembly, the first insulating part 300 is connected to the mounting part 420 of the electrode assembly 400 corresponding to the position of the tab, and the second insulating part 500 is wrapped around the outer peripheries of the bare battery cell 600 and the mounting part 420. Among them, the first insulating part 300 can be an insulating bracket or an insulating patch, and can be connected to the insulating part 422 by snap connection, bonding or ultrasonic welding. The second insulating part 500 can adopt a Mylar film and is wrapped around the outer peripheries of the bare battery cell 600 and the mounting part 420, so as to effectively insulate the bare battery cell 600 and the tab.

[0093] The electrode assembly equipped with the first insulating member 300 and the second insulating member 500 and the bare battery cell assembly are placed into the inner cavity of the housing 100. The electrode assembly 400 is located at the opening. The top cover plate 200 is sealed to the opening and connected to the housing 100 and / or the mounting member 420. Among them, after the electrode assembly 400 and the bare battery cell 600 are effectively insulated and assembled into an integral body, then they are put into the housing and the top cover plate 200 is sealed. The assembly is simple and convenient, which is conducive to automation implementation.

[0094] In the above method, when assembling the first insulating member 300, the first insulating member 300 can also be connected to the top cover plate 200 at the position corresponding to the tab. Thus, after the top cover plate 200 is sealed to the opening and connected to the housing 100 and / or the mounting member 420, insulation protection can also be formed for the tab area.

[0095] In the above method, one of the two top cover plates 200 can be integrally formed with the housing 100, or first assembled with the housing 100 into an integral body; the other top cover plate 200 can be first assembled and sealed with one side electrode assembly 400 and then put into the housing for assembly, or after the electrode assembly 400 and the bare battery cell 600 are assembled into an integral body and put into the housing, it is then assembled and welded with one side electrode assembly 400 and / or the housing 100.

[0096] The assembly method of the single battery in the above embodiment is simple and convenient, which is conducive to automation implementation. The assembly structure form has a large flexibility and has a variety of derivative methods. For bare battery cells with different thicknesses and widths, they can be well compatible after fine-tuning. Therefore, it can be used for the assembly of the double-pass structure of thick single batteries, especially the assembly of ultra-thick single batteries, which helps to solve the problem that it is difficult to assemble thick single batteries in the current double-pass structure.

[0097] The following is an application of assembling a single battery with two bare battery cells 600 by using the assembly method of the single battery in the above embodiment. The assembly method includes:

[0098] Prepare the electrode assembly 400, the bare battery cell 600, the housing 100, the first insulating member 300, the second insulating member 500 and the top cover plate 200 in the single battery of the above embodiment, where the electrode assembly 400 is a structure in which the adapter 410 has two connecting wings 411;

[0099] When assembling the assembly of the electrode assembly and the bare single battery, refer to Figure 21, place the positive tabs 610 of two bare battery cells 600 at the same end, with the negative tabs 620 facing the other end relative to the positive tabs 610, and then make the two bare battery cells 600 abut against each other; connect the two electrode assemblies 400 to both ends of the bare battery cells 600 respectively. Among them, each positive tab 610 corresponds to each connecting wing 411 located at one end of the positive tab 610, and each negative tab 620 corresponds to each connecting wing 411 located at one end of the negative tab 620; electrically connect each positive tab 610 to the corresponding connecting wing 411 and fold them outwards or inwards together and flatten them, and electrically connect each negative tab 620 to the corresponding connecting wing 411 and fold them outwards or inwards together and flatten them to form an electrode assembly and a bare battery cell assembly;

[0100] Reference Figure 22 and Figure 23 , connect the first insulating member 300 to the mounting member 420 of the electrode assembly 400; Reference Figure 24 and Figure 25 , wrap the second insulating member 500 around the outer peripheries of the bare battery cell 600 and the mounting member 420; Reference Figure 26 , cover the top cover plate 200 on the opening of the housing 100 and connect it to the mounting member 420 or the housing 100, thereby completing the assembly of the single battery.

[0101] The single battery of the embodiment of the present application is accommodated in a box and used for assembling a battery pack, and can be used as a power battery and applied to various electrical devices. For example, as the main power source of an electric vehicle, as a key component of a power battery, the structure of the power battery electrode assembly has a significant impact on the energy density, economy, and safety of the power battery. As described above, the connection and insulation structure of the single battery tabs are optimized. The single battery uses an electrode assembly with a transfer member to connect the bare battery cell tabs, and the tabs are folded along with the connecting wings of the transfer member, thereby reducing the internal space occupation, helping to improve the energy density of the battery, and the single battery can be made into a double-pass structure with pole columns separated at both ends. The welding operation of the connecting wing and the tab is simpler, and it can be applied to the assembly of a relatively thick bare battery cell to form a double-pass battery with a high capacity density; through the insulating part of the connecting member, the first insulating member, and the second insulating member, the insulating installation of the bare battery cell, the tab, and the housing is realized. The insulation protection is relatively easy to achieve and very reliable, and it is easy to assemble. Therefore, the battery pack composed of the single battery can effectively improve the energy density of the battery and reduce the cost while meeting the functional and safety requirements.

[0102] The above has described the embodiments of the present application in detail with reference to the drawings, but the present application is not limited to the above embodiments. Various changes can be made without departing from the gist of the present application within the knowledge scope of those of ordinary skill in the art. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A single cell, characterized in that, include: A bare cell, a shell, two first insulating members, two electrode assemblies and two top cover plates, wherein the electrode assembly includes a pole terminal, a mounting member and a transition member that can be assembled into an assembly, wherein: The mounting member comprises a mounting portion and an insulating portion connected to the mounting portion, the mounting portion is provided with a first through hole, the pole terminal is passed through the through hole and protrudes from the first through hole to the outside of the mounting member; The adapter includes a base and a plurality of connecting wings, wherein the base is connected to the insulating portion and extends to the mounting portion to be electrically connected to the pole terminal, the connecting wings stand upright toward the outside of the mounting portion at a set angle with the base and can be folded relative to the base, and the connecting wings are used to be electrically connected to the tabs of the bare battery cell; The bare cell has a positive electrode ear and a negative electrode ear, the positive electrode ear and the negative electrode ear are arranged at opposite ends of the bare cell, the two electrode assemblies are respectively connected to the two ends of the bare cell, the positive electrode ear and the negative electrode ear are respectively electrically connected to the connecting wings in the corresponding electrode assemblies, and are folded along the connecting wings to the outside of the substrate or the outside of the end of the bare cell; The shell has an inner cavity and an opening for the bare battery core to enter the inner cavity, the bare battery core is placed in the inner cavity, and the shell has the openings at both ends corresponding to the positive electrode ear and the negative electrode ear; The two top cover plates respectively cover the openings at both ends of the shell and are respectively connected to the shell, and the top cover plates are provided with second through holes for the pole terminals to pass through; Each of the first insulating members corresponds to the position of the connecting wings and the pole ears, and is connected to the mounting member and / or the top cover plate.

2. The single cell according to claim 1, characterized in that, The adapter comprises a pair of connecting wings, which are symmetrically arranged on both sides of one end of the base, and the other end of the base is electrically connected to the pole terminal.

3. The single cell according to claim 2, characterized in that, The insulating portion covers the outer side of the portion of the base body located between the connecting wings.

4. The single cell according to claim 1, characterized in that, The adapter comprises a pair of connecting wings, which are respectively arranged on opposite sides of two ends of the base, and the middle part of the base is electrically connected to the pole terminal.

5. The single cell according to claim 4, characterized in that, The insulating portion covers an outer side of a portion of the base body corresponding to the connecting wing.

6. The single cell according to any one of claims 1 to 5, characterized in that, The insulating portion is provided with a making way portion for the connecting wing to pass through.

7. The single cell according to claim 1, characterized in that, The single cell battery comprises two bare cells, the positive pole ears of the two bare cells face the same end, and the negative pole ears face the other end relative to the positive pole ears; the two ends of the bare cells are respectively connected to the electrode assemblies, and the adapter of the electrode assembly comprises two connecting wings; the connecting wings located at one end of the positive pole ears are respectively electrically connected to the positive pole ears, and the connecting wings located at one end of the negative pole ears are respectively electrically connected to the negative pole ears.

8. An assembly method of a single cell, characterized in that, The steps include: Prepare an electrode assembly, a bare cell, a shell and a top cover plate in a single cell as described in any one of claims 1 to 7; The positive electrode tab and the negative electrode tab of the bare cell are electrically connected to the connecting wing on the adapter of the electrode assembly, and are folded outward or inward and flattened together with the connecting wing to form an electrode assembly and a bare cell assembly; On the electrode assembly and the bare battery cell assembly, an insulating member is provided at a position corresponding to the tab and on the outer periphery of the bare battery cell, and then it is inserted into the inner cavity of the housing. The electrode assembly is located at the opening, and the top cover plate is sealed to the opening and connected to the housing and / or the mounting member.

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