A single battery

Abstract

The present invention discloses a single cell battery. The single cell battery comprises a shell and a cover plate, wherein one end of the two ends of the shell along a first direction is open and the other end is closed, and the cover plate is arranged on the open end; the single cell battery further comprises an elastic support, a first current collecting plate, a battery cell and a second current collecting plate arranged in sequence along the first direction in the shell; the elastic support is configured to be in a compressed state so as to press the first current collecting plate, the battery cell and the second current collecting plate between the elastic support and the closed end of the shell; the two ends of the battery cell along the first direction are respectively provided with a first pole ear and a second pole ear, the first pole ear and the second pole ear are respectively led out from the pole sheet foil of the battery cell and flattened into a flat shape; the first current collecting plate abuts against the flat first pole ear, and the second current collecting plate abuts against the flat second pole ear. The single cell battery of the present invention omits the welding process required for connecting the traditional pole ear with the pole column, saves the pole sheet foil material, and simplifies the production process and equipment investment.

Description

Technical Field

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

[0002] Lithium-ion batteries are widely used in various industries due to their advantages such as low cost, long life and easy recycling. Commonly used lithium-ion battery cells are wound cells, and each positive or negative electrode sheet will lead to a pole ear. Therefore, multiple pole ears need to be welded first, and then connected to the pole column, or connected to the pole column through a connecting sheet. The process is cumbersome and the equipment investment is large. In addition, in order to facilitate welding, the pole ears are extended for a long length, resulting in more pole sheet foil materials, which increases the overall production cost of the single battery. Summary of the invention

[0003] The object of the present invention is to provide a single cell battery, which can omit the welding process of the pole ear, save the pole piece foil material, simplify the production process of the single cell battery, and reduce the production cost.

[0004] In order to achieve the above objectives, the following technical solutions are provided:

[0005] A single cell battery comprises a shell and a cover plate, wherein one end of the two ends of the shell along a first direction is open and the other end is closed, and the cover plate is arranged on the open end; the single cell battery further comprises an elastic support member, a first current collecting plate, a battery cell and a second current collecting plate arranged in sequence along the first direction in the shell; the elastic support member is configured to be in a compressed state so as to press the first current collecting plate, the battery cell and the second current collecting plate between the elastic support member and the closed end of the shell;

[0006] The battery cell is provided with a first pole ear and a second pole ear at both ends along the first direction, respectively. The first pole ear and the second pole ear are respectively led out from the pole foil of the battery cell and flattened into a flat shape; the first current collecting plate abuts against the flat first pole ear, and the second current collecting plate abuts against the flat second pole ear.

[0007] Optionally, the lead-out length of the first pole tab or the second pole tab is 2-7 mm.

[0008] Optionally, the elastic support member includes a support body and a pole mounting hole opened in the support body, and the pole is arranged on the cover plate, and the pole passes through the cover plate and the pole mounting hole and is connected to the first current collecting plate.

[0009] Optionally, a mounting boss is protruding from the inner side wall of the cover plate, and the mounting boss is located in the pole mounting hole, so that the support body abuts against the inner side wall of the cover plate.

[0010] Optionally, a first clearance groove is provided on a side of the support body close to the cover plate.

[0011] Optionally, a plurality of liquid inlet holes are provided on the support body, and two adjacent liquid inlet holes are separated by a partition; and the first relief groove is provided on the partition.

[0012] Optionally, the first current collecting plate includes a foldable first plate body and a second plate body, the first plate body abuts against the pole, the second plate body abuts against the battery cell, and the size of the first plate body is smaller than that of the second plate body.

[0013] Optionally, the first plate body includes a welding portion and a connecting portion that are connected to each other, and the connecting portion is connected to the second plate body; a second clearance groove is provided on a side of the support body close to the battery cell, and the second clearance groove is communicated with the pole mounting hole, and the connecting portion of the first plate body is clamped in the second clearance groove; the welding portion of the first plate body is located in the pole mounting hole.

[0014] Optionally, the second current collecting plate has a first current collecting surface close to the battery cell and a second current collecting surface away from the battery cell, and a portion of the second current collecting surface is recessed toward the first current collecting surface to form a current collecting protrusion on the first current collecting surface, and the current collecting protrusion and the second current collecting surface are respectively abutted against the second pole ear of the battery cell and the closed end of the shell.

[0015] Optionally, an explosion-proof hole is arranged on the cover plate, and an explosion-proof valve is arranged in the explosion-proof hole; a blocking groove is also opened on the inner side wall of the cover plate, and the blocking groove is arranged along the periphery of the explosion-proof hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The single cell provided by the present invention realizes the compression of the two electrode current collecting plates and the battery cell in the shell through the elastic force of the elastic support member, thereby ensuring that the electrode current collecting plates are fully abutted against the corresponding pole ears in the flattened state, thereby omitting the welding process required for connecting the traditional pole ears and poles, simplifying the production process and the corresponding equipment investment; and since the welding process is omitted, the protruding length of the pole ears can be reduced as much as possible, which is conducive to saving pole sheet foil materials and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded schematic diagram of a single cell in an embodiment of the present invention;

[0019] Figure 2 is a cross-sectional view of a single cell in an embodiment of the present invention;

[0020] Figure 3 for Figure 2 A local enlarged schematic diagram of the middle A;

[0021] Figure 4 for Figure 2 A partial enlarged schematic diagram of point B in the middle;

[0022] Figure 5 is a cross-sectional view of a cover plate according to an embodiment of the present invention;

[0023] Figure 6 is a schematic structural diagram of an elastic support member in an embodiment of the present invention at a first viewing angle;

[0024] Figure 7 is a schematic structural diagram of an elastic support member in an embodiment of the present invention at a second viewing angle;

[0025] Figure 8 Schematic diagram of the assembly of the elastic support member and the negative electrode current collecting plate in an embodiment of the present invention;

[0026] Fig. 9 Schematic diagram of the structure of the positive electrode current collecting plate in an embodiment of the present invention;

[0027] Fig.10 is a cross-sectional view of a positive electrode current collector in an embodiment of the present invention;

[0028] Fig.11 for Fig.10 A partial enlarged schematic diagram of point C in the middle.

[0029] Reference numerals:

[0030] 10. Shell;

[0031] 20. Cover plate; 21. Pole; 22. Insulator; 23. Mounting boss; 24. First pole mounting hole; 25. Explosion-proof hole; 26. Explosion-proof valve; 27. Protective film; 28. Barrier groove; 29. ​​Liquid injection hole;

[0032] 30. elastic support member; 31. support body; 32. second pole mounting hole; 33. liquid inlet through hole; 34. partition; 35. first make way groove; 36. second make way groove;

[0033] 40. negative electrode current collecting plate; 41. first plate body; 42. second plate body; 411. welding part; 412. connecting part

[0034] 50. Battery cell; 51. Negative electrode sheet; 52. Positive electrode sheet; 53. Separator; 54. Protective film; 55. Negative electrode tab; 56. Positive electrode tab;

[0035] 60. Positive electrode current collecting plate; 61. First current collecting surface; 62. Second current collecting surface. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] refer to Figure 1-4, this embodiment provides a single cell battery, specifically, the single cell battery comprises a shell 10, a cover plate 20, and an elastic support member 30, a first current collecting plate, a battery cell 50 and a second current collecting plate arranged in sequence along a first direction in the shell 10; one of the two ends of the shell 10 along the first direction is open, and the other end is closed, and the cover plate 20 is arranged on the open end to close the entire single cell battery; the two ends of the battery cell 50 along the first direction are respectively provided with a first pole ear and a second pole ear, and the first pole ear and the second pole ear are respectively led out from the pole sheet foil of the battery cell 50 and flattened into a flat shape; the elastic support member 30 is configured to be in a compressed state, so as to press the first current collecting plate, the battery cell 50 and the second current collecting plate between the elastic support member 30 and the closed end of the shell 10, so as to achieve a close contact between the first current collecting plate and the first pole ear of the battery cell 50, and between the second current collecting plate and the second pole ear of the battery cell 50, and thus fully contact. A pole 21 is arranged on the cover plate 20, and the pole 21 passes through the entire cover plate 20 and is connected to the first current collecting plate. In this embodiment, the end where the first current collector plate is located is the negative electrode, so the first current collector plate is the negative electrode current collector plate 40, and the first pole ear abutting therewith is the negative pole ear 55; the pole column 21 is the negative pole column; the end where the second current collector plate is located is the positive electrode, so the second current collector plate is the positive electrode current collector plate 60, and the second pole ear abutting therewith is the positive pole ear 56. Of course, in other embodiments, the positions of the positive and negative electrodes can be interchanged, and the corresponding first current collector plate becomes the positive electrode current collector plate 60, the second current collector plate becomes the negative electrode current collector plate 40, and the pole column 21 is the positive pole column. For cylindrical batteries, the first direction here refers to the axial direction of the shell 10; for rectangular batteries, the first direction here refers to the length direction of the shell 10. During the specific implementation, the positive current collecting plate 60 is first installed at the closed end in the shell 10, and then the battery cell 50, the negative current collecting plate 40, and the elastic support member 30 are placed in turn. Finally, the cover plate 20 closes the shell 10 to put the elastic support member 30 in a compressed state, thereby achieving the purpose of squeezing the negative current collecting plate 40, the battery cell 50 and the positive current collecting plate 60.

[0044] The single battery provided in this embodiment realizes the compression of the two electrode current collecting plates and the battery cell 50 in the housing 10 through the elastic force of the elastic support member 30, so as to ensure that the electrode current collecting plates are fully in contact with the corresponding pole ears in the flattened state, thereby omitting the welding process required for connecting the traditional pole ears with the pole column 21, simplifying the production process and the corresponding equipment investment; and because the welding process is omitted, the extension length of the pole ears can be reduced as much as possible, which is conducive to saving pole foil materials and reducing costs. Further, refer to Figure 3 and Figure 4, the lead-out length of the negative electrode tab 55 leading out of the negative electrode sheet 51 and the lead-out length of the positive electrode tab 56 leading out of the positive electrode sheet 52 are both within the range of 2-7mm, which can not only ensure that the flat state is achieved, but also minimize the thickness after flattening; compared with the traditional welding process, the tab needs to lead out of the electrode sheet by 15-40mm, which can significantly reduce the material consumption and greatly reduce the cost of raw materials. In this embodiment, the negative electrode tab 55 is made of copper foil with a lead-out length of 3-7mm; the positive electrode tab 56 is made of aluminum foil, and the lead-out length is 2-5mm. In order to prevent the positive electrode sheet 52 in the battery cell 50 from contacting with the negative electrode sheet 51 and causing a short circuit, a diaphragm 53 is arranged between the positive electrode sheet 52 and the negative electrode sheet 51; a protective film 54 is coated on the outside of the entire battery cell 50 to prevent the battery cell 50 from contacting with the shell 10 and causing a short circuit.

[0045] Specifically, refer to Figure 1 , 2 5. This embodiment also provides a cover plate for the above-mentioned single battery. The cover plate 20 is provided with a first pole mounting hole 24. The pole 21 is arranged in the first pole mounting hole 24. A circle of insulators 22 is arranged between the pole 21 and the cover plate 20. The pole 21 is fixed to the cover plate 20 through the insulator 22. Optionally, the insulator 22 is made of glass material, so that the cover plate 20 and the pole 21 can be integrally formed by a glass sintering process, which ensures sufficient sealing and simplifies the production process of the cover plate 20. In specific implementation, the cover plate 20, the insulator 22 and the pole 21 are assembled on the graphite jig according to the setting position from the outside to the inside, and then placed in a high-temperature oven equipment, and the sintering parameters are determined to melt the insulator 22 to bond the pole 21 and the cover plate 20. After cooling, the cover plate 20 and the pole 21 form an integrated structure; during the sintering process, nitrogen needs to be introduced into the oven for protection, and the cover plate 20 is placed for oxidation.

[0046] Further, refer to Figure 5 , an explosion-proof hole 25 is also provided on the cover plate 20, and an explosion-proof valve 26 is installed in the explosion-proof hole 25. The gas in the working process of the battery can break through the explosion-proof valve 26 and leak out through the explosion-proof hole 25 to prevent the battery from exploding due to excessive internal gas pressure. Further, a blocking groove 28 is also provided on the inner side wall of the cover plate 20, and the blocking groove 28 is arranged along the periphery of the explosion-proof hole 25 to isolate the insulator 22 from the explosion-proof hole 25; since the assembly of the explosion-proof valve 26 involves welding operations, the setting of the blocking groove 28 can block the transfer of heat during welding connection, prevent the sintered insulator 22 from melting again, and ensure the sealing and reliability of the insulator 22. Optionally, the explosion-proof hole 25 is a waist-shaped structure, and the blocking groove 28 is also correspondingly set to a waist-shaped structure to fully block the welding heat. Further optionally, a plurality of blocking grooves 28 are provided, and the plurality of blocking grooves 28 are arranged in sequence along the direction away from the explosion-proof valve 26 to further improve the heat blocking effect.

[0047] Optionally, the cover plate 20 is made of aluminum, which is lightweight and can effectively reduce the weight of the entire cover plate 20 to achieve lightweight battery; the pole 21 is made of conductive materials such as copper or aluminum.

[0048] In the traditional production process of the cover plate 20, the pole 21 needs to be assembled by riveting or welding, and a sealing component needs to be used to seal the pole 21 and the cover plate 20. At the same time, in order to avoid a short circuit between the pole 21 and the shell 10, the pole 21 itself needs to undergo various mechanical processing and overmolding. Not only are there many structural components, the manufacturing process is also complicated, the cost is high, and the sealing performance of the final product cannot be effectively guaranteed. The cover plate 20 or pole 21 provided in this embodiment can be directly cut from a cylindrical copper or aluminum material, or punched from a copper-aluminum composite sheet, without the need for other mechanical processing technology, and the process is simple and the material utilization rate is high; since the glass insulator 22 has a better insulating effect, the cover plate 20 and the pole 21 are formed as a whole through the insulator 22 made of glass material by a sintering process, and there is no need for the pole 21 to perform related mechanical processing or overmolding, and the sealing and insulation between the pole 21 and the cover plate 20 can be fully guaranteed, thereby simplifying the production process of the cover plate 20; at the same time, due to the provision of the barrier groove 28, the welding heat when welding the explosion-proof valve 26 will not be excessively transferred to the insulator 22, thereby improving the reliability of the sealed connection between the pole 21 and the cover plate 20.

[0049] Specifically, Figure 2 and Figure 5 As shown, a mounting boss 23 is protruding on the inner wall of the cover plate 20, the first pole mounting hole 24 passes through the cover plate 20 and the mounting boss 23, and the insulator 22 is distributed axially in the first pole mounting hole 24. Without increasing the thickness of the cover plate 20, the bonding area of ​​the insulator 22 is increased, the connection strength between the pole 21 and the cover plate 20 is ensured, and the sealing effect is improved.

[0050] Specifically, still refer to Figure 5 A protective film 27 is provided at one end of the explosion-proof hole 25 away from the battery cell 50; a mounting step is provided at one end of the explosion-proof hole 25 close to the battery cell 50, and the explosion-proof valve 26 is installed on the mounting step; the protective film 27 can prevent external impurities from entering the explosion-proof hole 25 and interfering with the normal operation of the explosion-proof valve 26. Furthermore, an exhaust hole with a diameter of 0.3-1.0 mm is opened on the protective film 27 to ensure the normal outflow of gas inside the battery.

[0051] refer to Figure 2 , Figure 6 and Figure 7The elastic support member 30 includes a support body 31 and a second pole mounting hole 32 provided in the support body 31. The negative pole passes through the second pole mounting hole 32 and is connected to the negative current collector 40, thereby realizing the charging and discharging of the battery. Optionally, the second pole mounting hole 32 is provided at the center of the support body 31. Furthermore, a liquid injection hole 29 is provided on the cover plate 20, which is used to complete the liquid injection operation of the battery cell 50 after the single battery is assembled. A liquid channel is also provided on the support body 31, so that the electrolyte can be poured into the battery cell 50 through the liquid channel. Optionally, a plurality of liquid channels are provided on the support body 31, and are evenly distributed along the circumference of the second pole mounting hole 32 to improve the immersion speed and immersion uniformity of the electrolyte. Specifically, the liquid channel is a liquid inlet through hole 33 provided on the support body 31, and two adjacent liquid inlet through holes 33 are separated by a partition 34, which can ensure the strength of the entire support body 31 and does not affect the injection of the electrolyte. Optionally, the liquid inlet through hole 33 is a fan-shaped hole. Optionally, the elastic support member 30 is made of an elastic material with insulation, heat resistance and corrosion resistance, such as EPDM, fluororubber, silicone rubber, etc.

[0052] Further, refer to Figure 2 , the aperture of the second pole mounting hole 32 is larger than the outer diameter of the mounting boss 23 of the cover plate 20, so that the mounting boss 23 of the cover plate 20 can extend into the second pole mounting hole 32 of the support body 31, so that the support body 31 can abut against the inner wall of the cover plate 20, increase the abutment area with the cover plate 20 as much as possible, and better play the supporting role; at the same time, arranging the mounting boss 23 in the second pole mounting hole 32 also facilitates the positioning between the cover plate 20 and the elastic support member 30 during the assembly process. Specifically, a first clearance groove 35 is provided on the side of the support body 31 close to the cover plate 20 to avoid the injection hole 29, explosion-proof hole 25, etc. on the cover plate 20, avoid interference with the injection, and also avoid the elastic support member 30 from squeezing the explosion-proof valve 26 during the extrusion process and causing damage to it. Optionally, in this embodiment, the first clearance groove 35 is provided on the partition 34.

[0053] refer to Figure 1 , Figure 2 and Figure 8The negative electrode current collector 40 includes a foldable first plate body 41 and a second plate body 42, the first plate body 41 abuts against the negative electrode column, and the second plate body 42 abuts against the battery cell 50, and the size of the first plate body 41 is smaller than that of the second plate body 42; the negative electrode current collector 40 is set to two foldable plates, and the sizes of the two plates are set differently, in order to match the negative electrode column and the tabs of the battery cell 50 respectively; generally, the tabs of the battery cell 50 will cover the entire end surface of the battery cell 50 after being flattened, so in order to ensure a stable connection between the battery cell 50 and the negative electrode column, the area where the negative electrode current collector 40 abuts against the battery cell 50 is as large as possible, but since the size of the negative electrode column is small, in order to facilitate its connection with the current collector, the corresponding connection area needs to be as small as possible, so the entire negative electrode current collector 40 is set to two foldable parts, which does not affect the conduction between the negative electrode column and the battery cell 50 and is convenient for installation. Specifically, the first plate body 41 includes a welding portion 411 and a connecting portion 412 connected to each other, and the connecting portion 412 is connected to the second plate body 42; the size of the welding portion 411 is less than or equal to the size of the second pole mounting hole 32, so that the welding portion 411 can enter the second pole mounting hole 32 and be smoothly welded and connected with the negative pole. The support body 31 of the elastic support member 30 is provided with a second clearance groove 36 on the side close to the battery cell 50, and the second clearance groove 36 is connected to the second pole mounting hole 32, and the connecting portion 412 of the first plate body 41 can be clamped in the second clearance groove 36. Specifically, after the connecting portion 412 is placed in the second clearance groove 36, the welding portion 411 can accurately enter the second pole mounting hole 32, ensuring the assembly and positioning of the negative pole and the welding portion 411, and also realizing the assembly and positioning of the negative current collector 40. After the welding of the negative pole is completed, the second plate body 42 is bent so that it is arranged parallel to the first plate body 41. Furthermore, the size of the second plate body 42 is smaller than the size of the supporting body 31 to prevent the second plate body 42 from completely blocking the liquid inlet holes 33 on the supporting body 31 and preventing the electrolyte from entering.

[0054] refer to Figure 9-11 The positive current collector plate 60 has a first current collector surface 61 close to the battery cell 50 and a second current collector surface 62 away from the battery cell 50, which are respectively used to abut against the positive pole ear 56 of the battery cell 50 and the closed end of the shell 10; further, part of the second current collector surface 62 of the positive current collector plate 60 is recessed toward the first current collector surface 61 to form a current collector protrusion on the first current collector surface 61, and the current collector protrusion directly abuts against the positive pole ear 56 of the battery cell 50. The contact area between the current collector protrusion and the battery cell 50 is equal to the contact area between the first current collector surface 61 and the shell 10, so as to ensure that the positive current collector plate 60 is fully fitted with the battery cell 50 and the shell 10, and reduce the contact impedance. At the same time, the current collector protrusion formed by the recessed second current collector surface 62 can also serve as a reinforcing rib, which serves to strengthen the strength of the positive current collector plate 60 and prevent the positive current collector plate 60 from being deformed. Optionally, the positive current collector plate 60 is stamped and formed by aluminum or copper.

[0055] In this embodiment, the single cell adopts a cylindrical cell, so the housing 10 is a hollow cylindrical structure, and the cover plate 20, the elastic support member 30, the battery cell 50, the positive electrode current collector 60, the negative electrode current collector 40, etc. all adopt a circular structure to match the cylindrical housing 10, ensuring that the internal structure of the housing 10 is placed firmly. Of course, in the specific implementation, there is no specific restriction on the external structure of the single cell, and the shape structure of each component inside the housing 10 is not limited to the above-mentioned circle; for example, the elastic support member 30 can be set to a circle, square, fan-shaped or polygonal shape, etc. according to needs.

[0056] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A single cell battery, comprising a shell (10) and a cover plate (20), wherein one end of the shell (10) along a first direction is open and the other end is closed, and the cover plate (20) is arranged to cover the open end; characterized in that: The single battery further comprises an elastic support member (30), a first current collecting plate, a battery cell (50) and a second current collecting plate which are sequentially arranged in the shell (10) along the first direction; the elastic support member (30) is configured to be in a compressed state so as to press the first current collecting plate, the battery cell (50) and the second current collecting plate between the elastic support member (30) and the closed end of the shell (10); The battery cell (50) is provided with a first pole ear and a second pole ear at both ends along the first direction, the first pole ear and the second pole ear are respectively led out from the pole sheet foil of the battery cell (50) and flattened into a flat shape; the first current collecting plate abuts against the flat first pole ear, and the second current collecting plate abuts against the flat second pole ear; The elastic support member (30) comprises a support body (31) and a second pole mounting hole (32) provided in the support body (31); a pole (21) is arranged on the cover plate (20); the pole (21) passes through the cover plate (20) and the second pole mounting hole (32) and is connected to the first current collecting plate; The first current collecting plate comprises a foldable first plate body (41) and a second plate body (42), the first plate body (41) abuts against the pole (21), the second plate body (42) abuts against the battery cell (50), and the size of the first plate body (41) is smaller than the size of the second plate body (42); A first pole mounting hole (24) is provided on the cover plate (20); the pole (21) is arranged in the first pole mounting hole (24); a circle of insulators (22) is arranged between the pole (21) and the cover plate (20); the pole (21) is fixed to the cover plate (20) via the insulators (22); the insulators (22) are made of glass material, so that the cover plate (20) and the pole (21) can be integrally formed by a glass sintering process.

2. The single cell according to claim 1, characterized in that: The lead-out length of the first pole tab or the second pole tab is 2-7 mm.

3. The single cell according to claim 1, characterized in that: A mounting boss (23) is protruding on the inner side wall of the cover plate (20), and the mounting boss (23) is located in the second pole mounting hole (32) so that the support body (31) abuts against the inner side wall of the cover plate (20).

4. The single cell according to claim 1, characterized in that: A first clearance groove (35) is provided on a side of the support body (31) close to the cover plate (20).

5. The single cell according to claim 4, characterized in that: The support body (31) is provided with a plurality of liquid inlet through holes (33), and two adjacent liquid inlet through holes (33) are separated by a partition plate (34); the first clearance groove (35) is provided on the partition plate (34).

6. The single cell according to claim 1, characterized in that: The first plate body (41) comprises a welding portion (411) and a connecting portion (412) which are connected to each other, and the connecting portion (412) is connected to the second plate body (42); a second clearance groove (36) is provided on a side of the support body (31) close to the battery cell (50), and the second clearance groove (36) is connected to the second pole mounting hole (32), and the connecting portion (412) of the first plate body (41) is clamped in the second clearance groove (36); and the welding portion (411) of the first plate body (41) is located in the pole mounting hole.

7. The single cell according to claim 1, characterized in that: The second current collecting plate comprises a first current collecting surface (61) close to the battery cell (50) and a second current collecting surface (62) away from the battery cell (50); a portion of the second current collecting surface (62) is recessed toward the first current collecting surface (61) to form a current collecting protrusion on the first current collecting surface (61); the current collecting protrusion and the second current collecting surface (62) are respectively in contact with the second pole ear of the battery cell (50) and the closed end of the shell (10).

8. The single cell according to claim 1, characterized in that: An explosion-proof hole (25) is arranged on the cover plate (20), and an explosion-proof valve (26) is arranged inside the explosion-proof hole (25); a blocking groove (28) is also opened on the inner side wall of the cover plate (20), and the blocking groove (28) is arranged along the periphery of the explosion-proof hole (25).

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