Battery cell and battery pack

Abstract

The utility model provides a battery cell and a battery pack, the structure of the battery cell comprises a pole group, and a positive tab and a negative tab are respectively arranged at two ends of the pole group in the length direction; the upper end plate is mounted at the end part of the pole group in the length direction, and the upper end plate is positioned at the upper parts of the positive tab and the negative tab; and a lower end plate installed at an end portion of the pole group in a length direction, the lower end plate being located at a lower portion of the positive tab and the negative tab. The battery cell and the battery pack can solve the problem that the battery cells need to be assembled when the battery pack is produced.

Description

Technical Field

[0001] The present application relates to the technical field of battery packaging, and in particular to a battery cell and a battery pack. Background Art

[0002] Faced with the increasingly severe energy crisis and huge pressure to reduce emissions, it is an inevitable development trend for energy-saving and environmentally friendly new energy vehicles to replace traditional fuel vehicles. Lithium-ion batteries, with their excellent electrical properties and no environmental pollution, have become the most promising power batteries for electric vehicles and have broad market application prospects.

[0003] Generally, the production steps of automotive lithium-ion batteries include the production of battery cells and the welding and assembly of battery modules or whole packs. The battery cells need to be welded and assembled through metal connecting pieces to form battery modules and battery packs. The assembly process between battery cells requires workshop space, equipment, tooling, and manpower, and the process is complex and costly. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a battery cell and a battery pack to solve the problem of assembly between battery cell units required in producing a battery pack.

[0005] According to the utility model, a battery cell is provided, wherein the battery cell comprises: a pole group, wherein a positive pole ear and a negative pole ear are respectively arranged at both ends in the length direction; an upper end plate, installed at the end of the pole group in the length direction, wherein the upper end plate is located above the positive pole ear and the negative pole ear; and a lower end plate, installed at the end of the pole group in the length direction, wherein the lower end plate is located below the positive pole ear and the negative pole ear.

[0006] Preferably, one of the upper end plate and the lower end plate is provided with an assembly pin, and the other is provided with a pin hole capable of cooperating with the assembly pin, and the upper end plate is snap-connected with the lower end plate.

[0007] Preferably, when the upper end plate is clamped with the lower end plate, a gap is formed between the upper end plate and the lower end plate for the positive electrode tab or the negative electrode tab to pass through.

[0008] Preferably, both ends of the upper end plate and the lower end plate in the length direction are provided with openings for allowing electrolyte to flow.

[0009] Preferably, the battery cell further comprises an insulating film, the insulating film is wrapped around the electrode group, and the insulating film is welded to the upper end plate and the lower end plate at two ends of the electrode group in the length direction.

[0010] According to the second aspect of the utility model, a battery pack is provided, wherein the battery pack comprises a shell, a first pole, a second pole and the battery cell as described above, a plurality of cavities are arranged in the shell along the length direction, a plurality of the battery cells are arranged in the plurality of cavities respectively, a first pole is arranged in the cavity at the position corresponding to the positive pole ear and the negative pole ear of the battery cell, the first pole is conductively connected to the positive pole ear or the negative pole ear, a second pole is arranged outside the shell at the position corresponding to the first pole, the first pole is conductively connected to the second pole, at least part of the second pole is conductively connected to two adjacent first poles, thereby conductively connecting the positive and negative poles of two adjacent battery cells.

[0011] Preferably, the shell has step portions formed at both ends in the length direction of the cavity, the first pole is arranged on the side of the step portion facing the inside of the shell, a first plastic for insulation is arranged between the first pole and the step portion, the positive pole ear or the negative pole ear of the battery cell is connected to the first pole, the second pole is arranged on the side of the step portion facing the outside of the shell, a second plastic for insulation is arranged between the second pole and the step portion, and the first pole and the second pole are connected by a rivet column.

[0012] Preferably, the second pole includes: a short pole, which is arranged at the end of the shell in the length direction, and the short pole is installed on a single step portion; and a long pole, the two ends of the long pole are respectively installed on two adjacent step portions, and the long pole is conductively connected to the positive and negative electrodes of two adjacent battery cells.

[0013] Preferably, a fuse device is provided in the middle of the long pole, and the fuse device is wrapped in the second plastic.

[0014] Preferably, the shell comprises: a shell portion, formed with an opening side for placing the battery cell, the cavity is formed in the shell portion, the shell portion is provided with a liquid injection hole and an explosion-proof valve at a position corresponding to the opening; and a cover plate welded to the opening side of the shell portion.

[0015] The utility model discloses a battery cell and a battery pack, wherein the electrode group of the battery cell is respectively provided with a positive electrode ear and a negative electrode ear at both ends in the length direction, and the upper end plate and the lower end plate are installed at the ends in the length direction of the electrode group, the upper end plate is located at the upper part of the positive electrode ear and the negative electrode ear, and the lower end plate is located at the lower part of the positive electrode ear and the negative electrode ear, so as to shape and fix the electrode ears, and the battery pack is provided with a plurality of cavities along the length direction in a shell, a plurality of battery cells are respectively installed in the plurality of cavities, and the upper end plate and the lower end plate play a role in positioning the electrode group in the cavity, a first pole is provided in the cavity at a position corresponding to the positive electrode ear and the negative electrode ear of the battery cell, and a second pole is provided outside the shell at a position corresponding to the first pole, the first pole is conductively connected to the second pole, and the second pole is conductively connected to the positive and negative electrodes of two adjacent battery cells, so as to save the assembly process between battery cell monomers, and the battery pack can be directly produced by producing battery cell monomers, thereby reducing the manufacturing cost, so as to effectively solve the problem of assembly between battery cell monomers required for producing battery packs.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a battery pack according to the utility model.

[0019] Figure 2 It is a structural schematic diagram of the battery pack according to the utility model from another angle.

[0020] Figure 3 It is a schematic diagram of a battery pack according to the utility model.

[0021] Figure 4 It is a schematic diagram of the outer shell of the battery pack according to the utility model.

[0022] Figure 5 It is a schematic diagram of the outer shell of the battery pack according to the present invention from another angle.

[0023] Figure 6 It is a structural schematic diagram of the outer shell of the battery pack according to the utility model.

[0024] Figure 7It is a schematic diagram of the outer shell of the battery pack according to another angle.

[0025] Figure 8 yes Figure 7 Cross-sectional view of part A.

[0026] Fig. 9 It is a schematic diagram of a battery cell according to the utility model.

[0027] Fig.10 It is a schematic diagram of a partial structure of a battery cell according to the utility model.

[0028] Fig.11 It is a schematic structural diagram of an end plate of a battery cell according to the utility model.

[0029] Figure numerals: 1-pole group; 11-positive electrode ear; 12-negative electrode ear; 21-upper end plate; 210-assembly pin; 22-lower end plate; 220-pin hole; 23-gap; 24-opening; 3-insulating film; 30-thermal melting point; 4-battery pack; 5-shell; 50-cavity; 500-step portion; 51-outer shell; 511-liquid injection hole; 512-explosion-proof valve; 52-cover plate; 53-first pole; 530-first plastic; 54-second pole; 540-second plastic; 541-short pole; 542-long pole; 5420-fuse device; 55-sealing ring; 56-rivet column. DETAILED DESCRIPTION

[0030] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0031] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0032] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0033] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0034] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0035] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0036] The terms used herein are only used to describe various examples and are not used to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprising" and "having" list the existence of the stated features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0037] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0038] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0039] like Figures 1 to 11 As shown, according to a first aspect of the present invention, a battery cell is provided, which includes a pole group 1, an upper end plate 21 and a lower end plate 22.

[0040] In the following description, reference will be made to Figures 1 to 11 The specific structure of the above components of the battery cell and the connection relationship of the above components are specifically described.

[0041] like Figures 8 to 11 As shown, in the embodiment, the positive electrode ear 11 and the negative electrode ear 12 may be respectively provided at both ends of the electrode group 1 in the length direction. The upper end plate 21 may be installed at the end of the electrode group 1 in the length direction. Specifically, the two upper end plates 21 may be respectively provided at the upper part of the positive electrode ear 11 and the negative electrode ear 12. The lower end plate 22 may also be installed at the end of the electrode group 1 in the length direction. The two lower end plates 22 may be respectively provided at the lower part of the positive electrode ear 11 and the negative electrode ear 12. The upper end plate 21 and the lower end plate 22 can cooperate to clamp the positive electrode ear 11 and the negative electrode ear 12 therein, thereby realizing the shaping and fixing of the positive electrode ear 11 and the negative electrode ear 12.

[0042] Preferably, Fig. 9 and Fig.10As shown, in the embodiment, the shape of the electrode group 1 can be approximately a rectangular parallelepiped, and the positive electrode ear 11 and the negative electrode ear 12 can be respectively arranged at the center of both ends in the length direction of the electrode group 1. The positive electrode ear 11 and the negative electrode ear 12 protrude from the end surface of the electrode group 1. The upper end plate 21 and the lower end plate 22 can be formed in a strip shape. The length of the upper end plate 21 and the lower end plate 22 can be equal to the width of the electrode group 1, so that the upper end plate 21 and the lower end plate 22 can be just installed at the end of the electrode group 1.

[0043] Preferably, Fig.11 As shown, in the embodiment, one of the upper end plate 21 and the lower end plate 22 may be provided with an assembly pin 210, and the other may be provided with a pin hole 220 capable of cooperating with the assembly pin 210. Specifically, the lower end surface of the upper end plate 21 may be formed with an assembly pin 210 protruding downward. The upper end surface of the lower end plate 22 may be formed with a pin hole 220 capable of cooperating with the assembly pin 210 at a corresponding position. The assembly pin 210 can be inserted into the pin hole 220, thereby enabling the upper end plate 21 to be clamped with the lower end plate 22. Preferably, the number of the assembly pins 210 may be two, and the two assembly pins 210 may be arranged at intervals in the length direction of the upper end plate 21, and the number of the pin holes 220 corresponds to the number of the assembly pins 210, so that the upper end plate 21 and the lower end plate 22 can be firmly clamped.

[0044] More preferably, Fig. 9 As shown, in the embodiment, when the upper end plate 21 and the lower end plate 22 are clamped, a gap 23 is formed between the upper end plate 21 and the lower end plate 22. That is, after the upper end plate 21 and the lower end plate 22 are assembled together, a strip-shaped gap 23 is still left between the upper end plate 21 and the lower end plate 22, so that the sheet-shaped positive electrode ear 11 and the negative electrode ear 12 can pass through it. Then, the positive electrode ear 11 and the negative electrode ear 12 are shaped and fixed.

[0045] In addition, preferably, Fig. 9 and Fig.11 As shown, in the embodiment, the upper end plate 21 and the lower end plate 22 may also be provided with openings 24, and the openings 24 are used to allow electrolyte to flow and to allow gas to be discharged in the event of thermal runaway. Specifically, the number of openings 24 may be multiple, and the multiple openings 24 may be respectively provided at both ends of the upper end plate 21 and the lower end plate 22 in the length direction. More preferably, the upper end plate 21 and the lower end plate 22 may be provided with rectangular grooves at both ends in the length direction, and the multiple openings 24 may be provided in the rectangular grooves.

[0046] Preferably, Fig. 9As shown, in an embodiment, the battery cell may further include an insulating film 3, and the insulating film 3 may be made of polypropylene. The insulating film 3 may be wrapped around the outside of the pole group 1. Specifically, the insulating film 3 is wrapped around the end surface of the pole group 1 except for the two ends in the length direction. The size of the insulating film 3 in the length direction of the pole group 1 may be larger than the pole group 1, so that the two ends of the insulating film 3 protrude from the two ends of the pole group 1. Preferably, the insulating film 3 may be hot-melt welded at both ends in the length direction of the pole group 1 to the periphery of the upper end plate 21 and the periphery of the lower end plate 22, thereby fixing the upper end plate 21 and the lower end plate 22 to the pole group 1. A plurality of hot melting points 30 may be arranged around the ends of the pole group 1 in the length direction.

[0047] In addition, if Figures 1 to 11 As shown, according to the second aspect of the utility model, a battery pack 4 is provided, and the battery pack 4 may include a shell 5, a first pole 53, a second pole 54, and a battery cell as described above. Among them, a plurality of cavities 50 may be arranged in the shell 5 along the length direction, and a plurality of the battery cells may be arranged in the plurality of cavities 50 respectively. A first pole 53 may be arranged in the cavity 50 at a position corresponding to the positive pole ear 11 and the negative pole ear 12 of the battery cell, and the first pole 53 is conductively connected to the positive pole ear 11 or the negative pole ear 12. A second pole 54 may be arranged outside the shell 5 at a position corresponding to the first pole 53. The first pole 53 is conductively connected to the second pole 54, and at least part of the second pole 54 can be conductively connected to the two adjacent first poles 53, thereby conductively connecting the positive poles or negative poles of the two adjacent battery cells, so that the plurality of battery cells can be connected in series or in parallel, thereby eliminating the process of assembling the battery cell monomers and reducing the manufacturing cost.

[0048] Preferably, Figures 1 to 8 As shown, in an embodiment, the shell 5 may include a shell portion 51 and a cover plate 52. The shape of the shell portion 51 may be approximately a cuboid, and a plurality of cavities 50 may be arranged in a row in the shell portion 51. A partition may be provided between adjacent cavities 50, so that the battery cells in the cavities 50 can be independently sealed. Preferably, 2 to 20 cavities 50 may be provided in the shell portion 51 (four cavities 50 are provided in the embodiment of the present application), and the length direction of the cavity 50 may be perpendicular to the length direction of the shell portion 51. The shell portion 51 may be formed with an opening side for placing the battery cell, and the operator may load the battery cell into the shell portion 5 through the opening side, and the cover plate 52 may be welded to the opening side of the shell portion 51, so as to seal the battery cell in the shell 5.

[0049] In addition, preferably, Figures 1 to 6As shown, in the embodiment, the size between the upper end plates 21 at both ends of the battery cell and the size between the lower end plates 22 can be less than or equal to the size of the cavity 50. When the battery cell is installed in the cavity 50, the upper end plate 21 and the lower end plate 22 can position the battery cell in the length direction of the battery cell to prevent the battery cell from moving. Preferably, the shell 51 can be selectively provided with a liquid injection hole 511 and an explosion-proof valve 512 at the position corresponding to the opening 24 of the upper end plate 21 and the lower end plate 22, so as to circulate the electrolyte and discharge the gas in the event of thermal runaway.

[0050] Preferably, Figures 1 to 8 As shown, in the embodiment, the shell part 51 may be formed with a step portion 500 at both ends in the length direction of the cavity 50. The length of the step portion 500 may be less than the width of the cavity 50, and the step portion 500 may be located at the center of the end of the cavity 50. The first pole 53 may be arranged on the side of the step portion 500 facing the inside of the shell 5. Specifically, the first pole 53 may be a sheet-like structure, and a first plastic 530 for insulation may be arranged between the first pole 53 and the step portion 500, and the first pole 53 and the first plastic 530 may be stacked on the table of the step portion 500 facing the inside of the shell 5. The positive pole ear 11 and the negative pole ear 12 of the battery cell may be welded to the first pole 53 at both ends of the cavity 50 respectively to achieve conductivity, and the welding position may be provided with glue protection or glue point protection. The second pole 54 may be arranged on the side of the step portion 500 facing the outside of the shell 5, and a second plastic 540 for insulation may be arranged between the second pole 54 and the step portion 500. Specifically, the second pole 54 can also be formed into a sheet structure, and the second pole 54 and the second plastic 540 can be stacked on the table surface of the step portion 500 facing the outside of the shell 5, that is, the first pole 53 and the second pole 54 are respectively arranged on both sides of the step portion 500.

[0051] Further, preferably, Figures 2 to 8 As shown, in an embodiment, the first pole 53 can be riveted to the second pole 54. Figure 7 As shown in , the riveted column 56 can be sequentially arranged from left to right to fix the first pole 53, the first plastic 530, the step portion 500, the second plastic 540 and the second pole 54, thereby conductively connecting the first pole 53 with the second pole 54. The riveted column 56 can be integrally formed with the first pole 53, and the end of the riveted column 56 can be welded to the second pole 54. More preferably, a sealing ring 55 for sealing can be provided between the first plastic 530 and the step portion 500, and a sealing ring 55 for sealing can be provided between the second plastic 540 and the step portion 500.

[0052] In addition, preferably, Figures 3 to 6As shown, in the embodiment, the second pole 54 includes a short pole 541 and a long pole 542. The short pole 541 can be arranged at the end of the housing 5 in the length direction. The short pole 541 can be installed on a single step portion 500 located at the end of the housing 5. Specifically, as Figure 6 As shown, in the embodiment, when the number of cavities 50 is an even number, two short poles 541 can be arranged at both ends in the length direction of the same side of the shell 5 (when the number of cavities 50 is an odd number, the two short poles 541 can be arranged at the ends in the length direction of the opposite side of the shell 5). The two ends of the long pole 542 can be respectively installed on two adjacent step portions 500, that is, the two ends of the long pole 542 are riveted to the two adjacent first poles 53 respectively, so that the long pole 542 can be conductively connected to the positive or negative poles of the two adjacent battery cells to achieve series or parallel connection between the battery cells. More preferably, a fuse device 5420 can also be provided in the middle of the long pole 542. The fuse device 5420 can be wrapped in the second plastic 540. Specifically, the second plastic 540 can be formed into a strip shape, and a channel for the long pole 542 to pass through can be opened inside the second plastic 540. The middle part of the long pole 542 passes through the second plastic 540, so that the fuse device 5420 is wrapped in the second plastic 540 to prevent large current or short circuit of the battery pack 4.

[0053] During use, the battery pack 4 can be directly formed after being produced by the battery cell production line. Each battery cell is relatively independent and does not require secondary welding. It is only necessary to install the electrode group 1 in the cavity 50 of the battery pack 4. Each battery cell is conductively connected through the first electrode 53 and the second electrode 54, so that the assembly process of the battery pack 4 can omit the assembly process between the battery cells, thereby reducing the manufacturing cost.

[0054] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: The electrode group is provided with a positive electrode ear and a negative electrode ear at both ends in the length direction; An upper end plate, mounted at an end of the electrode group in the length direction, the upper end plate being located above the positive electrode tab and the negative electrode tab; and A lower end plate is installed at the end of the electrode group in the length direction, and the lower end plate is located below the positive electrode ear and the negative electrode ear.

2. The battery cell according to claim 1, characterized in that: One of the upper end plate and the lower end plate is provided with an assembly pin, and the other is provided with a pin hole capable of cooperating with the assembly pin, and the upper end plate is clamped with the lower end plate.

3. The battery cell according to claim 2, characterized in that: When the upper end plate is clamped with the lower end plate, a gap is formed between the upper end plate and the lower end plate for the positive electrode tab or the negative electrode tab to pass through.

4. The battery cell according to claim 3, characterized in that: The upper end plate and the lower end plate are provided with openings at both ends in the length direction for electrolyte to flow.

5. The battery cell according to claim 4, characterized in that: The battery cell further includes an insulating film, which is wrapped around the electrode group, and the insulating film is welded to the upper end plate and the lower end plate at two ends of the electrode group in the length direction.

6. A battery pack, characterized in that: The battery pack includes a shell, a first pole, a second pole and multiple battery cells as described in claim 5, a plurality of cavities are arranged in the shell along the length direction, and the multiple battery cells are arranged in the plurality of cavities respectively, and the first poles are arranged in the cavities at the positions corresponding to the positive pole ears and negative pole ears of the battery cells, and the first poles are conductively connected to the positive pole ears or the negative pole ears, and a second pole is arranged outside the shell at the position corresponding to the first pole, and the first pole is conductively connected to the second pole, and at least part of the second pole is conductively connected to two adjacent first poles, thereby conductively connecting the positive and negative poles of two adjacent battery cells.

7. The battery pack according to claim 6, characterized in that: The shell has step portions formed at both ends in the length direction of the cavity, the first pole is arranged on the side of the step portion facing the inside of the shell, a first plastic for insulation is arranged between the first pole and the step portion, the positive pole ear or the negative pole ear of the battery cell is connected to the first pole, the second pole is arranged on the side of the step portion facing the outside of the shell, a second plastic for insulation is arranged between the second pole and the step portion, and the first pole and the second pole are connected by a rivet column.

8. The battery pack according to claim 7, characterized in that: The second pole comprises: a short pole, arranged at an end portion of the housing in the length direction, the short pole being mounted on a single step portion; and A long pole, both ends of which are respectively mounted on two adjacent step portions, and the long pole is conductively connected to the positive and negative electrodes of two adjacent battery cells.

9. The battery pack according to claim 8, characterized in that: A fuse device is arranged in the middle of the long pole, and the fuse device is wrapped in the second plastic.

10. The battery pack according to any one of claims 6 to 9, characterized in that: The housing comprises: A shell portion, formed with an opening side for placing the battery core, the cavity is formed in the shell portion, and the shell portion is provided with a liquid injection hole and an explosion-proof valve at a position corresponding to the opening; and A cover plate is welded to the opening side of the shell portion.

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