Battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery, which comprises a shell, a water blocking shell and a battery cell, a closed first inner cavity is formed in the shell, and the water blocking shell is arranged in the first inner cavity; the water blocking shell is a plastic shell, a second inner cavity is formed in the water blocking shell, and the battery cell is arranged in the second inner cavity; the outer surface of the water blocking shell and the inner surface of the shell are arranged at an interval, so that an annular cavity surrounding the water blocking shell is formed between the outer surface of the water blocking shell and the inner surface of the shell; and a liquid supplementing hole is formed in the shell. According to the utility model, the water-blocking shell is integrated with the battery cell in advance and then is put into the shell, and the water-blocking shell made of a plastic material has certain rigidity, so that the rigidity of the battery cell is compensated, and the battery cell can be conveniently put into an aluminum shell by personnel.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a battery. Background Art

[0002] The power battery of the car is divided into soft pack battery and hard pack battery. Because the soft pack battery uses aluminum plastic film to wrap the battery cell and electrolyte, when grouping, many brackets must be installed outside the soft pack battery cell to enhance its strength. The hard shell battery generally has the battery cell and electrolyte placed in the aluminum shell. Because it has a harder aluminum shell, it does not need to form a module. It can be directly assembled into a battery pack by stacking multiple long aluminum shell batteries.

[0003] Hard shell batteries generally use rectangular aluminum shells, but the battery cells in the rectangular aluminum shells are long and have poor rigidity, and are easily bent during the process of being installed into the rectangular aluminum shells, which makes it difficult to install the battery cells into the rectangular aluminum shells and the manufacturing process is difficult. Utility Model Content

[0004] The embodiment of the utility model provides a battery to solve the problem that it is difficult to install a battery cell in a hard shell battery in the prior art.

[0005] The utility model also provides a battery, including a shell, a water-blocking shell and a battery core;

[0006] A closed first inner cavity is arranged inside the outer shell, and the water-blocking shell is arranged in the first inner cavity;

[0007] The water-blocking shell is a plastic shell, a second inner cavity is arranged inside the water-blocking shell, and the battery core is arranged in the second inner cavity;

[0008] The outer surface of the water blocking shell and the inner surface of the outer shell are spaced apart to form an annular chamber surrounding the water blocking shell therebetween;

[0009] The shell is provided with a fluid replenishment hole and a closing structure, and the closing structure can close or open the fluid replenishment hole. When the fluid replenishment hole is opened, electrolyte can be injected into the annular chamber through the fluid replenishment hole.

[0010] Optionally, the water-blocking shell is a PP shell, a PE shell or a PVC shell; the thickness of the water-blocking shell is 50um-1000um.

[0011] Optionally, the second inner cavity is a closed inner cavity.

[0012] Optionally, the volume of the battery core is smaller than the volume of the second inner cavity; and the water-blocking shell is provided with at least one notch or a plurality of puncture holes, so that the first inner cavity is connected to the second inner cavity through the notch or the puncture holes.

[0013] Optionally, the shell includes a shell, a first cover assembly and a second cover assembly, the shell has a first opening and a second opening arranged opposite to each other, the first cover assembly is connected to one end of the shell and closes the first opening, and the second cover assembly is connected to the other end of the shell and closes the second opening.

[0014] Optionally, the first cover plate assembly includes a first cover plate, a first pole ear, a first pole column assembly and a first insulating assembly; the first cover plate is provided with a first through hole penetrating the thickness thereof, the edge of the first cover plate coincides with the outer edge of the side wall of the shell and the first cover plate is fixedly connected to the shell, and the inner side of the first cover plate is spaced apart from the water blocking shell;

[0015] The first pole assembly includes a first pole, a first busbar, and a first riveting sheet;

[0016] The first busbar is provided with a first connection hole, the riveted sheet is provided with a second connection hole, the first connection hole, the second connection hole and the first through hole are coaxial, the first busbar is provided on the inner side of the first cover plate, the first riveted sheet is provided on the outer side of the first cover plate, and the first pole is sequentially penetrated through the first connection hole, the first through hole and the second connection hole;

[0017] The side wall of the first pole is spaced apart from the hole wall of the first through hole, and two ends of the first pole are respectively connected to the first busbar and the first riveting sheet;

[0018] The first insulating component includes a first insulating layer and a first plastic layer; the first insulating layer is disposed between the first busbar and the first cover plate, and the first plastic layer is disposed between the first riveted sheet and the first cover plate and bonds the first riveted sheet and the first cover plate;

[0019] One end of the first pole lug is connected to the battery cell, and the other end of the first pole lug is connected to the first pole column or the first busbar.

[0020] Optionally, the second cover plate assembly includes a second cover plate, a second pole ear, a second pole column assembly and a second insulating assembly; the second cover plate is provided with a second through hole penetrating the thickness thereof, the outer edge of the second cover plate coincides with the outer edge of the side wall of the second opening, the second cover plate is fixedly connected to the shell, and the inner side of the second cover plate is spaced apart from the water blocking shell;

[0021] The second pole assembly includes a second pole, a second busbar, and a second riveting sheet;

[0022] The second busbar is provided with a third connection hole, the riveted sheet is provided with a fourth connection hole, the third connection hole, the fourth connection hole and the second through hole are coaxial, the second busbar is provided on the inner side of the second cover plate, the second riveted sheet is provided on the outer side of the second cover plate, and the second pole is sequentially penetrated through the third connection hole, the second through hole and the fourth connection hole;

[0023] The side wall of the second pole and the hole wall of the second through hole are arranged at intervals, and the two ends of the second pole are respectively connected to the second busbar and the second riveting sheet;

[0024] The second insulating component includes a second insulating layer and a second plastic layer; the second insulating layer is disposed between the second busbar and the second cover plate, and the second plastic layer is disposed between the second riveted sheet and the second cover plate and bonds the second riveted sheet and the second cover plate;

[0025] One end of the second pole lug is connected to the battery cell, and the other end of the second pole lug is connected to the second pole column or the second busbar.

[0026] Optionally, the plastic layer is one of a PP adhesive layer, a PE adhesive layer, a polyimide adhesive layer or an epoxy resin adhesive layer.

[0027] Optionally, it further comprises a first stop frame and a second stop frame, wherein the first stop frame is disposed in the interval between the water blocking shell and the first cover plate, and the first stop frame abuts against the water blocking shell and the first cover plate respectively;

[0028] The second stop frame is disposed in a gap between the water blocking shell and the second cover plate, and the second stop frame abuts against the water blocking shell and the second cover plate respectively.

[0029] Optionally, the first stop frame and the second stop frame are hollow structures.

[0030] The utility model provides a battery, which uses a water-blocking shell to be pre-assembled with a battery cell as a whole, and then placed in an outer shell. Since the water-blocking shell made of plastic material has a certain rigidity, it can compensate for the rigidity of the battery cell, making it convenient for personnel to assemble the battery cell into the aluminum shell.

[0031] In addition, compared with the prior art battery with aluminum shell and Mylar film in the battery core, the utility model uses the pole ear to replace the soft connection, saving raw materials; secondly, the water-blocking shell is used to replace the Mylar film. Finally, the soft-pack battery of the utility model has the advantages of high shell efficiency and high yield.

[0032] Compared with the traditional soft-pack battery with aluminum-plastic film outer cover, the utility model has the following advantages: 1. The water-blocking shell is lower in cost than the aluminum-plastic film and has strong plasticity; 2. The depth of the accommodating cavity of the water-blocking shell for placing the battery cell is much deeper than the depth of the punching hole of the aluminum-plastic film, and batteries of various thicknesses can be produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is an overall schematic diagram of the first embodiment of the utility model;

[0035] Figure 2 It is an exploded schematic diagram of the overall structure of the first embodiment of the utility model;

[0036] Figure 3 It is an exploded schematic diagram of the first cover plate assembly in the first embodiment of the utility model;

[0037] Figure 4 It is a cross-sectional view of the first cover plate assembly in the first embodiment of the utility model.

[0038] Figure numerals: 1. outer shell; 11. first opening; 12. second opening; 2. water-blocking shell; 3. battery cell; 4. first pole ear; 5. first cover plate assembly; 51. first cover plate; 511. first through hole; 52. first pole; 53. first riveted sheet; 531. second connecting hole; 54. first bus bar; 541. first connecting hole; 61. first insulating layer; 62. first plastic layer; 71. first stop frame; 72. second stop frame; 8. second cover plate assembly; 91. liquid replenishing hole; 92. explosion-proof valve. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0040] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Reference Figure 1 and Figure 2 The utility model discloses a battery, comprising an outer shell 1, a water-blocking shell 2 and a battery cell 3; the outer shell 1 has a closed first inner cavity, the water-blocking shell 2 and the battery cell 3 are both arranged in the first inner cavity; the water-blocking shell 2 is a plastic shell, the interior of the water-blocking shell 2 has a second inner cavity, the battery cell 3 is arranged in the second inner cavity; the outer surface of the water-blocking shell 2 and the inner surface of the outer shell 1 are arranged at intervals to form an annular chamber surrounding the water-blocking shell between the two. A fluid replenishment hole is arranged on the outer shell, and the fluid replenishment hole of this embodiment is closed by foreign objects after fluid replenishment.

[0043] In the prior art, the aluminum-plastic film can form a receiving cavity for placing the battery cell through a punching process, and the punching depth of the aluminum-plastic film determines both the size of the battery cell inside it and the overall thickness of the battery outside. However, the punching depth of the aluminum-plastic film has an upper limit, and approaching or exceeding the punching limit can make the aluminum-plastic film easily rupture, thereby reducing the yield rate of the battery. Different from the prior art, the water-blocking shell 2 in this embodiment is a plastic shell, which can be manufactured by blow molding. The depth of the receiving cavity for placing the battery cell formed by the water-blocking shell 2 in this embodiment can be any depth in theory. Even in actual production, the depth of the receiving cavity formed by the water-blocking shell in this embodiment is far greater than the punching depth of the aluminum-plastic film. Since the aluminum shell in this embodiment can also be machined to form a thickness that matches the water-blocking shell 2, batteries of various thicknesses can be produced in the end, which is impossible for conventional aluminum-plastic films.

[0044] In this embodiment, a closing structure is required to be provided on the liquid infusion hole after liquid injection and formation. The closing structure is a plug that can be plugged into the liquid infusion hole or a hole cover that can close the liquid infusion hole. The plug or the hole cover can be fixed to the shell by welding, so that before welding, the plug or the hole cover does not close the liquid infusion hole, that is, the liquid infusion hole is in an open state. At this time, electrolyte can be injected into the shell, and the liquid infusion hole can be stably closed after the plug or the hole cover is welded to the shell.

[0045] The shell 1 in this embodiment is made of metal aluminum, and the water-blocking shell in this embodiment is one of a PP shell, a PE shell, and a PVC shell. The battery cell 3 in this embodiment is provided with a water-blocking shell 2, and the water-blocking shell 2 is a plastic shell, and the thickness of the water-blocking shell is 50um-1000um. The water-blocking shell in this embodiment can also be pre-formed as a whole with the battery cell 3 and placed in the aluminum shell, and because the water-blocking shell 2 itself has a certain rigidity and hardness, it is convenient for the battery cell 3 to be assembled into the shell 1.

[0046] In this embodiment, the second inner cavity is a closed inner cavity, thereby isolating the first inner cavity and the second inner cavity. While the aluminum shell protects the battery cell 3, the water-blocking shell 2 can also protect the battery cell 3, and the battery cell 3 has double-layer protection. The second inner cavity in this embodiment is closed, that is, the water-blocking shell completely wraps the battery cell, so that the water-blocking shell isolates the battery cell from the outside world, so that the battery cell is prevented from being exposed to the air during the processes of baking, liquid injection, and precipitation. Otherwise, water molecules in the air enter the water-blocking shell, and the electrolyte in the water-blocking shell reacts with water to produce a large amount of hydrofluoric acid and gas, which eventually leads to a chain reaction such as corrosion of the battery cell, temperature increase, and pressure increase, affecting the battery yield.

[0047] Reference Figure 3 and Figure 4 In this embodiment, the housing 1 includes a shell, a first cover assembly 5 and a second cover assembly 8. In this embodiment, the shell has a first opening 11 and a second opening 12, and the first cover assembly and the second cover assembly have two. The first cover assembly 5 corresponds to the first opening 11, and the first cover assembly 5 can be connected to the shell and close the first opening 11. The second cover assembly 8 corresponds to the second opening 12, and the second cover assembly 8 can be connected to the shell and close the second opening 12.

[0048] The first cover plate assembly 5 includes a first pole lug 4, a first cover plate 51, a first pole column assembly and an insulating assembly; the first cover plate 51 is provided with a first through hole 511 penetrating the thickness thereof, the edge of the first cover plate 51 coincides with the outer edge of the side wall of the shell, and the first cover plate and the shell are fixedly connected. In this embodiment, the cover plate 51 is also made of metal, and the cover plate 51 and the shell are connected by welding. The inner side of the cover plate 51 is spaced apart from the water blocking shell 2.

[0049] More specifically, the first pole assembly includes a first pole 52, a first busbar 54, and a first riveted sheet 53. A first connection hole 541 is provided on the first busbar 54, and a second connection hole 531 is provided on the first riveted sheet 53. The first connection hole 541, the second connection hole 531 and the first through hole 511 are coaxial. The first busbar 54 is provided on the inner side of the first cover plate 51, and the first riveted sheet 53 is provided on the outer side of the first cover plate 51. The first pole 52 is sequentially penetrated through the first connection hole 541, the through hole 511 and the second connection hole 531. The side wall of the first pole 52 and the hole wall of the first through hole 511 are arranged at intervals, and the two ends of the first pole 52 are respectively connected to the first busbar 54 and the riveted sheet 53.

[0050] The first insulating component includes a first insulating layer 61 and a first plastic layer 62; the first insulating layer 61 is disposed between the first busbar 54 and the first cover plate 51, and the first plastic layer 62 is disposed between the first riveted sheet 53 and the first cover plate 51 and adheres the first riveted sheet 53 and the first cover plate 51. Generally, the first plastic layer 62 is one of a PP adhesive layer, a PE adhesive layer, a polyimide adhesive layer or an epoxy resin adhesive layer. The first insulating layer 61 can be made of plastic material, or the same material as the first plastic layer 62.

[0051] One end of the first pole lug 4 can be connected to the first pole column or the first busbar. In this embodiment, one end of the first pole lug 4 is connected to the first busbar, and the other end of the pole lug 4 is connected to the positive electrode of the battery cell 3. The pole lug 4 passes through the water-blocking shell 2. Although the pole lug 4 passes through the water-blocking shell 2, the pole lug 4 and the water-blocking shell 2 are sealed and connected, and the second inner cavity can still be kept as a closed inner cavity. The first pole column assembly is used to electrically connect the pole lug 4 to the electrical equipment.

[0052] The second cover plate assembly 8 includes a second cover plate, a second pole ear, a second pole column assembly and a second insulating assembly; a second through hole is provided on the second cover plate that penetrates its thickness, the outer edge of the second cover plate coincides with the outer edge of the side wall of the second opening 12, and the second cover plate is fixedly connected to the shell, and the inner side of the second cover plate is spaced apart from the water blocking shell 2.

[0053] The second pole assembly includes a second pole, a second busbar, and a second riveted sheet. A third connection hole is provided on the second busbar, and a fourth connection hole is provided on the riveted sheet. The third connection hole, the fourth connection hole and the second through hole are coaxial. The second busbar is provided on the inner side of the second cover plate, and the second riveted sheet is provided on the outer side of the second cover plate. The second pole is sequentially penetrated through the third connection hole, the second through hole and the fourth connection hole. The side wall of the second pole and the hole wall of the second through hole are arranged at intervals, and both ends of the second pole are respectively connected to the second busbar and the second riveted sheet;

[0054] The second insulating component includes a second insulating layer and a second plastic layer; the second insulating layer is disposed between the second busbar and the second cover plate, and the second plastic layer is disposed between the second riveted sheet and the second cover plate and bonds the second riveted sheet and the second cover plate. Generally, the second plastic layer is one of a PP adhesive layer, a PE adhesive layer, a polyimide adhesive layer or an epoxy resin adhesive layer. The second insulating layer can be made of plastic material, or the same material as the second plastic layer.

[0055] In this embodiment, one end of the second pole tab is connected to the negative electrode of the battery cell 3 , and the other end of the second pole tab is connected to the second pole column or the second busbar.

[0056] It can be seen that the structures of the first cover plate 51 assembly 5 and the second cover plate assembly 8 in this embodiment are the same in principle, but the first cover plate 51 assembly 5 is connected to the positive electrode of the battery cell 3, and the second cover plate assembly 8 is connected to the negative electrode of the battery cell 3. Therefore, the liquid replenishing hole 91 is set on the first cover plate 51 or the second cover plate, and the liquid replenishing hole 91 can connect the first inner cavity with the outside. In this embodiment, the liquid replenishing hole is set on the first cover plate 51.

[0057] In this embodiment, the battery further includes a first stop frame 71 and a second stop frame 72. The first stop frame 71 is disposed in the interval between the water blocking shell 2 and the first cover plate 51, and the first stop frame 71 respectively abuts against the water blocking shell 2 and the first cover plate 51. The second stop frame 72 is disposed in the interval between the water blocking shell 2 and the second cover plate, and the second stop frame 72 respectively abuts against the water blocking shell 2 and the second cover plate. In this embodiment, the first stop frame 71 and the second stop frame sandwich the water blocking shell 2, restrict the water blocking shell 2, and prevent the water blocking shell 2 from shaking arbitrarily in the outer shell 1.

[0058] In order to ensure the volume of the first inner cavity as much as possible, the first stop frame 71 and the second stop frame 72 are both hollow structures, so that the stop frame 7 occupies a smaller volume of the first inner cavity, so that the capacity of the injected electrolyte is increased, the battery capacity is improved, and the energy density is increased.

[0059] In this embodiment, an explosion-proof valve 92 is further provided on the first cover plate 51. The explosion-proof valve 92 is a common technical means in the battery field and there are many types. This embodiment can adopt a suitable explosion-proof valve according to actual needs, so it is not described in detail.

[0060] Second embodiment

[0061] The present embodiment is different from the first embodiment in that: the volume of the battery cell is smaller than the volume of the second inner cavity; at least one notch or multiple puncture holes are provided on the water blocking shell, so that the first inner cavity is connected to the second inner cavity through the notch or puncture holes.

[0062] In this embodiment, a gap is set between the outer wall of the battery cell and the inner wall of the water-blocking shell, and the gap is used to facilitate the placement of the battery cell. After the water-blocking shell is placed in the battery cell, the water-blocking shell and the battery cell are placed in the aluminum shell together, and then the water-blocking shell is scratched or punctured. The puncturing method is used to form multiple puncture holes on the water-blocking shell, and the scratching method is used to form at least one cut on the water-blocking shell.

[0063] The injected electrolyte can enter the second inner cavity through the puncture or cut, especially into the gap between the battery core and the water-blocking shell, thereby increasing the injection amount of the electrolyte.

[0064] It is worth mentioning that the cuts or punctures in this embodiment are formed after the battery cell is placed in the aluminum shell. When the water-blocking shell and the battery cell inside are not placed in the aluminum shell, the water-blocking shell completely wraps the battery cell. At this time, liquid injection, chemical formation and other processes can be carried out.

[0065] The notches and punctures in this embodiment are provided when the electrolyte is insufficient. In this embodiment, when liquid replenishment is required, electrolyte is input into the liquid replenishment hole to fill the annular cavity and enter the water-blocking shell to react with the battery cell.

[0066] If the electrolyte is sufficient, there is no need for cutting or puncturing, that is, when the electrolyte is sufficient, which is the situation described in the first embodiment of the present application.

[0067] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A battery, characterized in that: Including a housing, a water-blocking shell and a battery cell; A closed first inner cavity is arranged inside the outer shell, and the water-blocking shell is arranged in the first inner cavity; The water-blocking shell is a plastic shell, a second inner cavity is arranged inside the water-blocking shell, and the battery core is arranged in the second inner cavity; The outer surface of the water blocking shell and the inner surface of the outer shell are spaced apart to form an annular chamber surrounding the water blocking shell therebetween; The shell is provided with a fluid replenishing hole.

2. The battery according to claim 1, characterized in that The water-blocking shell is a PP shell, a PE shell or a PVC shell; the thickness of the water-blocking shell is 50um-1000um.

3. The battery according to claim 1, characterized in that The second inner cavity is a closed inner cavity.

4. The battery according to claim 1, characterized in that The volume of the battery core is smaller than the volume of the second inner cavity; the water-blocking shell is provided with at least one notch or a plurality of puncture holes, so that the first inner cavity is connected to the second inner cavity through the notch or the puncture holes.

5. The battery according to claim 3 or 4, characterized in that: The housing includes a shell, a first cover assembly and a second cover assembly, the shell has a first opening and a second opening arranged opposite to each other, the first cover assembly is connected to one end of the shell and closes the first opening, and the second cover assembly is connected to the other end of the shell and closes the second opening.

6. The battery according to claim 5, characterized in that The first cover plate assembly comprises a first cover plate, a first pole ear, a first pole column assembly and a first insulating assembly; a first through hole penetrating the thickness of the first cover plate is provided, the edge of the first cover plate coincides with the outer edge of the side wall of the shell, and the first cover plate and the shell are fixedly connected, and the inner side of the first cover plate is spaced apart from the water blocking shell; The first pole assembly includes a first pole, a first busbar, and a first riveting sheet; The first busbar is provided with a first connection hole, the riveted sheet is provided with a second connection hole, the first connection hole, the second connection hole and the first through hole are coaxial, the first busbar is provided on the inner side of the first cover plate, the first riveted sheet is provided on the outer side of the first cover plate, and the first pole is sequentially penetrated through the first connection hole, the first through hole and the second connection hole; The side wall of the first pole is spaced apart from the hole wall of the first through hole, and two ends of the first pole are respectively connected to the first busbar and the first riveting sheet; The first insulating component includes a first insulating layer and a first plastic layer; the first insulating layer is disposed between the first busbar and the first cover plate, and the first plastic layer is disposed between the first riveted sheet and the first cover plate and bonds the first riveted sheet and the first cover plate; One end of the first pole lug is connected to the battery cell, and the other end of the first pole lug is connected to the first pole column or the first busbar.

7. The battery according to claim 6, characterized in that The second cover plate assembly comprises a second cover plate, a second pole ear, a second pole column assembly and a second insulating assembly; a second through hole is provided on the second cover plate and penetrates the thickness thereof, the outer edge of the second cover plate coincides with the outer edge of the side wall of the second opening, the second cover plate is fixedly connected to the shell, and the inner side of the second cover plate is spaced apart from the water blocking shell; The second pole assembly includes a second pole, a second busbar, and a second riveting sheet; The second busbar is provided with a third connection hole, the riveted sheet is provided with a fourth connection hole, the third connection hole, the fourth connection hole and the second through hole are coaxial, the second busbar is provided on the inner side of the second cover plate, the second riveted sheet is provided on the outer side of the second cover plate, and the second pole is sequentially penetrated through the third connection hole, the second through hole and the fourth connection hole; The side wall of the second pole and the hole wall of the second through hole are arranged at intervals, and the two ends of the second pole are respectively connected to the second busbar and the second riveting sheet; The second insulating component includes a second insulating layer and a second plastic layer; the second insulating layer is disposed between the second busbar and the second cover plate, and the second plastic layer is disposed between the second riveted sheet and the second cover plate and bonds the second riveted sheet and the second cover plate; One end of the second pole lug is connected to the battery cell, and the other end of the second pole lug is connected to the second pole column or the second busbar.

8. The battery according to claim 7, characterized in that The first plastic layer is one of a PP adhesive layer, a PE adhesive layer, a polyimide adhesive layer or an epoxy resin adhesive layer; the second plastic layer is one of a PP adhesive layer, a PE adhesive layer, a polyimide adhesive layer or an epoxy resin adhesive layer.

9. The battery according to claim 5, characterized in that It also includes a first stop frame and a second stop frame, wherein the first stop frame is arranged in the interval between the water blocking shell and the first cover plate, and the first stop frame abuts against the water blocking shell and the first cover plate respectively; The second stop frame is disposed in a gap between the water blocking shell and the second cover plate, and the second stop frame abuts against the water blocking shell and the second cover plate respectively.

10. The battery according to claim 9, characterized in that The first stop frame and the second stop frame are both hollow structures.

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