Lithium ion battery

Abstract

The utility model relates to the field of lithium ion battery preparation, and discloses an ion battery which comprises a shell, a battery pack body, a battery management system module and a plug assembly, the battery pack body and the battery management system module are packaged in the shell, a cavity position with an outward opening is arranged on the shell, and the plug assembly is arranged in the cavity position. A positive copper sheet and a negative copper sheet of the battery management system module are located on the side of the cavity position, the plug assembly is used for being connected with an external plug in an inserted mode so as to discharge outwards or charge the battery pack body, and the plug assembly is detachably installed in the cavity position. The front surfaces of a positive copper plate and a negative copper plate of the plug assembly are respectively fastened and attached to the back surfaces of a positive copper sheet and a negative copper sheet of the battery management system module, and an external plugging part of a plug of the plug assembly is positioned at the opening of the cavity position for external plugging. By applying the technical scheme, the universality of a battery product is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing, and in particular to a lithium-ion battery. Background Technology

[0002] With the development of new energy sources, lithium-ion batteries are increasingly widely used in various electronic products. For example, the power plugs of mechanical equipment and drones are mostly custom-made, and electronic product providers often include chargers in their products, eliminating the need for battery suppliers. Therefore, in the current battery manufacturing process, battery manufacturers customize batteries based on the electronic products compatible with each batch. Every time the compatible electronic product changes, the battery needs to be redesigned, resulting in high design costs and hindering mass production. Summary of the Invention

[0003] One of the objectives of this utility model embodiment is to provide a lithium-ion battery, and the application of this technical solution is beneficial to improving the versatility of battery products.

[0004] In a first aspect, this embodiment provides a lithium-ion battery, comprising: a casing, a battery pack body, a battery management system module, and a plug assembly.

[0005] The battery pack body and the battery management system module are encapsulated within the housing.

[0006] The housing has a cavity with an external opening, and the positive and negative copper plates of the battery management system module are located on the side of the cavity.

[0007] The plug assembly is used to connect to an external plug for discharging to the outside or charging the battery pack body. The plug assembly is detachably installed in the cavity. The front sides of the positive and negative copper plates of the plug assembly are firmly attached to the back sides of the positive and negative copper plates of the battery management system module, respectively. The external insertion part of the plug of the plug assembly is located at the opening of the cavity for external connection.

[0008] Optionally, the plug assembly includes: a plug for external connection, a communication circuit module, a positive copper plate, a negative copper plate, and a communication cable harness electrically connected to the communication circuit module.

[0009] The positive and negative copper plates are fixed to the left and right ends of the communication circuit module, respectively, forming a flat plate structure.

[0010] The communication harness is electrically connected to the battery management system module.

[0011] Each conductor plug at the first end of the plug is opposite to the back of the flat plate structure, and each conductor plug is tightly inserted into the conductor socket on the positive copper plate, the communication circuit module, and the negative copper plate.

[0012] The external connector is electrically connected to each of the conductor plugs and is located at the second end of the plug.

[0013] Optionally, the plug assembly further includes a plug housing, including a raised layer. The top plate of the raised layer has two clearance slots. The flat plate structure formed by the positive copper plate, communication circuit module, and negative copper plate is confined within the raised layer. The front surfaces of the positive and negative copper plates, exposed from the two clearance slots, are in contact with the back surfaces of the positive and negative copper plates of the battery management system module.

[0014] The plug housing is also provided with a wiring hole, located between the two clearance slots, through which the communication cable extends.

[0015] On the back of the base plate of the overhead layer, a protective wall with an shape matching the outer wall of the plug is also formed. The plug is located in the space enclosed by the protective wall. The space enclosed by the protective wall is connected to the overhead layer. Each of the conductor plugs at the first end of the plug is respectively connected to each of the conductor sockets of the flat plate structure located in the overhead layer.

[0016] Optionally, the housing includes a lower housing and a top housing cover, the battery pack body is encapsulated within the lower housing, the top housing cover covers the top of the lower housing, and the battery management system module is fixed to the bottom of the top housing cover.

[0017] The top cover of the housing has a protrusion that extends beyond the side wall of the lower housing.

[0018] The housing has a cavity with an external opening; specifically, the protrusion has a cavity.

[0019] The positive and negative copper plates of the battery management system module are located on the cavity side and are in contact with the positive and negative copper plates of the plug assembly.

[0020] Optionally, it also includes a plug cover, comprising a fixing plate and a through hole located on the fixing plate.

[0021] The fixing plate is fastened to the housing top cover located outside the cavity, the plug assembly is locked between the fixing plate and the housing top cover, and the plug surrounding the protective wall extends out from the through hole.

[0022] Optionally, the plug housing has a plurality of positioning holes extending vertically, and the top cover of the housing has a plurality of positioning posts. The plug housing is fixed to the positioning posts by a plurality of screws, and the screws pass through each of the positioning holes and are screwed to the positioning posts.

[0023] Optionally, the top plate of the elevated layer covers the connection structure between the flat plate structure and the plug.

[0024] Optionally, the external connector extends outside the port of the space enclosed by the protective wall.

[0025] Optionally, the flat plate structure is injection molded together with the plug housing.

[0026] Optionally, the plug is injection molded together with the plug housing.

[0027] Optionally, the positive copper plate of the plug-in assembly and the positive copper sheet of the battery management system module, as well as the negative copper plate of the plug-in assembly and the negative copper sheet of the battery management system module, are respectively provided with vertically aligned conductor fixing holes.

[0028] A plurality of conductor screws are respectively tightened into the corresponding conductor fixing holes, thereby tightening the positive electrode copper plate and positive electrode copper sheet that are in contact with each other, and tightening the negative electrode copper plate and negative electrode copper sheet that are in contact with each other.

[0029] As can be seen from the above, the plug assembly of this embodiment is installed in a cavity on the housing with an external opening and internal communication through a detachable connector. During the battery manufacturing process, the battery manufacturer can mass-produce lithium-ion batteries without the plug assembly. Before shipment, according to the power plug and charger plug of the currently compatible electronic product (such as mechanical equipment or drones), the currently compatible plug assembly is selected. After installing the detachable connector from the external opening of the cavity into the cavity of the housing, the finished lithium-ion battery is obtained and can be shipped.

[0030] Furthermore, by adopting the technical solution of this embodiment, multiple plug assemblies can be configured for lithium-ion batteries according to user needs, so that users can replace the plug assemblies at any time as needed, adapting to various application scenarios, improving the versatility of lithium-ion battery products, and enhancing the market competitiveness of lithium-ion battery products. Attached Figure Description

[0031] The accompanying drawings, which are provided to further illustrate the present invention and form part of this application, do not constitute an undue limitation of the present invention.

[0032] Figure 1 An exploded view of the plug assembly provided in an embodiment of this utility model;

[0033] Figure 2 , 3 These are three-dimensional structural schematic diagrams of the plug assembly provided in the embodiments of this utility model;

[0034] Figure 4 A schematic diagram of the assembly structure of the plug assembly provided in this embodiment of the utility model, which is installed to the bottom of the housing top cover;

[0035] Figure 5 , 6 These are exploded structural diagrams of the plug assembly, housing top cover, and plug cover plate provided in the embodiments of this utility model;

[0036] Figure 7 These are schematic diagrams showing the connection structure of the plug assembly, housing top cover, and plug cover plate provided in the embodiments of this utility model.

[0037] Figure 8 These are schematic diagrams of lithium-ion battery structures provided in embodiments of this utility model.

[0038] 1: Cavity; 2: BMS module; 21: Positive copper plate; 22: Negative copper plate;

[0039] 31: Positive copper plate; 32: Negative copper plate; 37: Conductor socket; 34: Communication circuit module;

[0040] 33: Plug; 30: Conductor insert; 35: Communication harness; 36: Terminal block;

[0041] 38: First positioning hole; 39: Positioning pin;

[0042] 4: Plug housing; 41: Top plate; 42: Bottom plate; 43: Elevated floor; 44: Support column; 45: Clearance gap; 46: Wall guard;

[0043] 5: Plug cover; 51: Fixing plate; 52: Through hole;

[0044] 6: Lower housing; 7: Top cover of housing; 71: Protrusion

[0045] 8: Screw; 9: Conductor fixing hole. Detailed Implementation

[0046] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0047] Examples of embodiments of the present invention described in detail below are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0048] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, but should not be construed as limiting the invention. In the description of the invention, it should be understood that terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0049] Furthermore, the terms "" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example

[0051] See Figure 1-8 .

[0052] This embodiment provides a lithium-ion battery, which mainly includes a casing, a battery pack body, a BMS module 2, and a plug assembly.

[0053] The battery pack body is composed of multiple battery cells connected in series, parallel, or a combination of both. The electrical connection structure of the battery pack is described in existing technology.

[0054] The battery pack body and the battery management system module (BMS module 2) are encapsulated within a housing, and the BMS module 2 is electrically connected to the battery pack body. The BMS module 2 can be installed, but is not limited to, at the top of the battery pack body where the electrodes are located.

[0055] A cavity 1 with an external opening is provided on the side of the housing near the positive electrode copper plate 21 and negative electrode copper plate 22 of the BMS module 2. This cavity 1 communicates with the space where the positive electrode copper plate 21 and negative electrode copper plate 22 of the BMS module 2 are located. The back sides of the positive electrode copper plate 21 and negative electrode copper plate 22 extend into the cavity 1. When the plug assembly is installed in the cavity 1, the front sides of the positive electrode copper plate 31 and negative electrode copper plate 32 of the plug assembly are respectively attached to the back sides of the positive electrode copper plate 21 and negative electrode copper plate 22 of the BMS module 2. The attached positive electrode copper plate 31 and positive electrode copper plate 21 are fastened together by removable screws 8, and the attached negative electrode copper plate 32 and negative electrode copper plate 22 are fastened together by removable screws 8. The positive and negative terminals and communication control signals of the battery pack body are electrically connected to the plug 33 through the BMS module 2, realizing the charging and discharging control of the lithium-ion battery. The plug assembly's external connection portion is located at the opening of cavity 1 for external connection, to provide current to the outside, or to charge the individual battery cells inside the battery pack body.

[0056] As can be seen from the above, the plug assembly of this embodiment is installed in a cavity 1 on the housing with an external opening and internal communication through a detachable connector. During the battery manufacturing process, the battery manufacturer can mass-produce lithium-ion batteries without the plug assembly. Before shipment, according to the power plug 33 and charger plug 33 of the currently compatible electronic products (such as mechanical equipment or drones), the currently compatible plug assembly is selected. After installing the detachable connector from the external opening of the cavity 1 into the cavity 1 of the housing, the finished lithium-ion battery is obtained and can be shipped.

[0057] Furthermore, by adopting the technical solution of this embodiment, multiple plug assemblies can be configured for lithium-ion batteries according to user needs, so that users can replace the plug assemblies at any time as needed, adapting to various application scenarios, improving the versatility of lithium-ion battery products, and enhancing the market competitiveness of lithium-ion battery products.

[0058] As an illustration of this embodiment, this embodiment also provides a lithium-ion battery packaging structure, in which the battery pack body is packaged in the lower housing 6, the electrodes of the battery pack body are located at the top of the lower housing, a housing top cover 7 is provided at the top of the lower housing 6, and the BMS module 2 is installed on the bottom surface of the housing top cover 7.

[0059] The top cover 7 of the housing also has a protrusion 71 extending beyond the side wall of the lower housing 6. A cavity 1 is provided on the protrusion 71, which is vertically penetrating. The rear end of the cavity 1 is connected to the space where the BMS module 2 is located, and the positive copper plate 21 and negative copper plate 22 of the BMS module 2 extend out of the cavity 1. When the top cover 7 of the housing is fastened and fixed to the lower housing 6, the protrusion 71 is suspended outside the side wall of the lower housing 6. The plug assembly is installed on the protrusion 71 suspended at the top of the side wall, which facilitates the installation and removal of the plug assembly and also facilitates the connection with the plug 33 of electronic products or chargers.

[0060] As an illustration of this embodiment, this embodiment also provides a specific implementation structure of a plug assembly, including a plug 33 with insertion parts at both ends, a communication circuit module 34, a positive copper plate 31, a negative copper plate 32, and a communication wire harness 35.

[0061] The communication harness 35 extends from the rear end of the communication circuit module 34 near the BMS module 2. A terminal block 36 is provided at the end of the communication harness 35. The terminal block 36 is connected to the communication interface on the BMS module 2 to realize the transmission of communication control signals and / or communication control parameters with the BMS module 2.

[0062] The first end of the plug 33 is electrically connected to the BMS module 2, and the second end is an external connector that is plugged into the external plug 33.

[0063] Positive copper plate 31 and negative copper plate 32 serve as the positive and negative terminals of the plug assembly, respectively, and are fixed to the left and right ends of the plate-shaped communication circuit module 34 (PCBA). The three are combined together to form a flat plate structure.

[0064] A plurality of conductor sockets 37 are provided on the positive copper plate 31, the communication circuit module 34, and the negative copper plate 32. The first end of the plug 33 faces the back of the flat structure and is provided with a plurality of conductor plugs 30, wherein the number of conductor plugs 30 is equal to or less than the number of conductor sockets 37 on the flat structure. The position of each conductor plug 30 matches a conductor socket 37 on the conductor plug 30. Each conductor plug 30 at the first end of the plug 33 is tightly inserted into the conductor socket 37 on the flat structure, so that the plug 33 is fastened to the back of the flat structure. The external connection part of the second end of the plug 33 is located at the opening end of the cavity 1, for example, but not limited to, extending out of the opening, for external connection, realizing the external electrical connection of the battery's communication control signal, positive and negative power terminals.

[0065] As can be seen from the above, the technical solution of this embodiment can connect the communication control signals and / or communication control parameters of the battery pack, the positive and negative terminals of the battery pack to the plug 33 without welding, and the plug-in connection method makes installation convenient.

[0066] In addition, the plug assembly in this embodiment has a compact structure, and the plug assembly is easy to install and disassemble, making it convenient for assembly and maintenance.

[0067] Furthermore, in this embodiment, screws 8 are used to fasten the positive copper plate 31, the negative copper plate 32 and the positive and negative copper sheets 22 of the BMS module 2, replacing the welding of the power wires in the prior art. This also helps to reduce the internal resistance of the lithium-ion battery, improve the overload capacity of the plug assembly, and reduce the heat generation of the plug assembly.

[0068] As an illustration of this embodiment, the plug assembly of this embodiment also includes a plug housing 4 made of colloid and injection molded.

[0069] The plug housing 4 includes an overhead layer 43 sandwiched between a top plate 41 and a bottom plate 42. A flat plate structure formed by the positive copper plate 31, the communication circuit module 34, and the negative copper plate 32 is located within the overhead layer 43. A support column 44 is connected between the top plate 41 and the bottom plate 42. The position of the support column 44 matches the corner position of the flat plate structure located in the overhead layer 43 to position the flat plate structure within the overhead layer 43 and prevent displacement. Two separate clearance slots 45 are provided at the rear end of the top plate 41 located above the space of the overhead layer 43. The rear ends of the positive copper plate 31 and negative copper plate 32 located at both ends of the flat plate structure are exposed from the two clearance slots 45, so that during installation, the front of the positive copper plate 31 and negative copper plate 32 located in the two clearance slots 45 are directly facing and tightly attached to the back of the positive copper plate 21 and negative copper plate 22 (extending out of the cavity 1 of the housing) of the BMS module 2 installed in the battery housing, and the screws 8 lock and fasten the connection.

[0070] A wiring hole is provided at the rear end of the plug housing 4, located between two clearance slots 45. The communication wire harness 35 led out from the communication circuit module 34 extends from the wiring hole. The wires are routed in a regular and orderly manner, and are staggered from the spaces for connecting to the positive and negative terminals of the battery, which facilitates the installation and electrical connection of the plug assembly to the battery pack.

[0071] A protective wall 46, perpendicular to the base plate 42, is provided on the back side of the base plate 42 below the space of the overhead layer 43 of the plug housing 4. The protective wall 46 forms a closed ring around the space on the back side of the base plate 42, and the space enclosed by the protective wall 46 is connected to the overhead layer 43. The plug 33 is confined within the space enclosed by the protective wall 46. Each conductor plug 30 at the first end of the plug 33 is respectively connected to each conductor socket 37 on the flat plate structure composed of the positive copper plate 31, the communication circuit module 34, and the negative copper plate 32 located in the overhead layer 43. The external connection portion of the plug 33 extends out from the port side of the space enclosed by the protective wall 46. The external connection portion of the plug 33 can be set slightly higher than the port end face of the protective wall 46 to facilitate user connection.

[0072] As can be seen from the above, by adopting this technical solution, the plug 33, communication circuit module 34, positive copper plate 31, negative copper plate 32, and communication wire harness 35 can be integrated into the plug housing 4. The plug assembly has an integrated modular structure. When installing the plug assembly into the battery pack, the user simply connects the connector at the end of the communication wire harness 35 to the connector on the BMS module 2, and then fixes the plug housing 4 into the cavity 1 of the housing. Disassembly is the reverse. The installation, disassembly, and replacement of the plug assembly are all very convenient.

[0073] In situations where a single battery product needs to be used in multiple applications, multiple plug assemblies can be configured for the battery product. Users can simply replace the plug assembly with the one that is currently compatible with their application scenario. This high degree of battery versatility can meet the wide range of user needs and enhance the market competitiveness of the battery product.

[0074] In addition, the plug housing 4 of this embodiment is provided with a top plate 41 above the space of the overhead layer 43. The top plate 41 covers the communication circuit module 34, the positive copper plate 31, and the negative copper plate 32, and covers the circuit structure of the communication circuit module 34, the positive copper plate 31, the negative copper plate 32 and the plug 33 under it, which improves the dustproof and moisture-proof properties of the plug assembly and improves the charging and discharging safety of the lithium-ion battery.

[0075] As an illustration of this embodiment, during the injection molding process of the plug housing 4, the communication circuit module 34 with the communication harness 35, the positive copper plate 31, and the negative copper plate 32 can be pre-placed in the injection mold so that they are integrated into the plug housing 4 during the injection molding process. In use, the plug 33 is pushed into the space enclosed by the protective wall 46 on the back of the base plate 42, allowing the conductor plug 30 at its first end to connect with the respective conductor sockets 37. This structure allows for easy installation, removal, and replacement of the accessory plug 33, providing convenience for the user.

[0076] As an illustration of this embodiment, a flat structure consisting of a communication circuit module 34 (with communication harness 35), a positive copper plate 31, and a negative copper plate 32 can be pre-placed in the injection mold before injection molding. During the injection molding process, the flat structure is integrated into the plug housing 4, forming an integrated injection molding structure. The plug 33 can be inserted from the back of the bottom plate 42 of the plug housing 4 to connect with the flat structure. The plug assembly has a compact structure, good protection, and good insulation, waterproofing, and dustproofing capabilities.

[0077] As an illustration of this embodiment, the first end of the plug 33 can also be pre-connected to the flat structure that is assembled with the communication circuit module 34, the positive copper plate 31, and the negative copper plate 32. When the plug housing 4 is injection molded, the pre-connected components are pre-placed in the injection mold so that they are integrated into the plug housing.

[0078] As an illustration of this embodiment, first positioning holes 38 for screws 8 to pass through are provided at the corners along the outer edge of the plug housing 4. Correspondingly, positioning posts 39 are provided on the bottom surface of the housing top cover 7. Second positioning holes are provided in the positioning posts 39. When the plug assembly is installed on the housing, the first positioning holes 38 of the plug housing 4 are aligned with the second positioning holes on the positioning posts 39 of the housing top cover 7. Screws 8 are installed into the positioning holes of the plug housing 4. The screws 8 are screwed into the positioning posts 39 of the housing top cover 7 to fix the plug assembly in the cavity 1 of the housing.

[0079] As an illustration of this embodiment, through conductor fixing holes 9 are provided on the positive and negative copper plates 32 of the plug assembly and the positive copper sheet 21 and negative copper sheet 22 of the BMS module 2. When the positive and negative copper plates 32 are in contact with the positive copper sheet 21 and negative copper sheet 22, the conductor fixing holes 9 of the two are aligned vertically. The close-fitting positive and negative copper plates 32 and the positive copper sheet 21 and negative copper sheet 22 are fastened together by conductor screws 8.

[0080] As an illustration of this embodiment, the lithium-ion battery of this embodiment is further provided with a plug cover 5. The plug cover 5 includes a fixing plate 51 and a through hole 52 located in the fixing plate 51. After the plug assembly is installed into the cavity 1 of the protrusion 71 of the housing top cover 7, the fixing plate 51 of the plug cover 5 is fixed on the bottom plate 42 of the protrusion 71. The plug assembly is limited and locked between the fixing plate 51 and the housing structure. The plug cover 5 encapsulates the installation structure of the housing top cover 7 and the plug assembly, thereby improving the moisture-proof and dust-proof performance of the lithium-ion battery.

[0081] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A lithium-ion battery, characterized in that it comprises: Casing, battery pack body, battery management system module, connector assembly, The battery pack body and the battery management system module are encapsulated within the housing. The housing has a cavity with an external opening, and the positive and negative copper plates of the battery management system module are located on the side of the cavity. The plug assembly is used to connect to an external plug for discharging to the outside or charging the battery pack body. The plug assembly is detachably installed in the cavity. The front sides of the positive and negative copper plates of the plug assembly are firmly attached to the back sides of the positive and negative copper plates of the battery management system module, respectively. The external insertion part of the plug of the plug assembly is located at the opening of the cavity for external connection.

2. The lithium-ion battery according to claim 1, characterized in that, The plug assembly includes: a plug for external connection, a communication circuit module, a positive copper plate, a negative copper plate, and a communication cable harness electrically connected to the communication circuit module. The positive and negative copper plates are fixed to the left and right ends of the communication circuit module, respectively, forming a flat plate structure. The communication harness is electrically connected to the battery management system module. Each conductor plug at the first end of the plug is opposite to the back of the flat plate structure, and each conductor plug is tightly inserted into the conductor socket on the positive copper plate, the communication circuit module, and the negative copper plate. The external connector is electrically connected to each of the conductor plugs and is located at the second end of the plug.

3. The lithium-ion battery according to claim 2, characterized in that, The plug assembly also includes a plug housing, comprising a raised layer. Two clearance slots are provided on the top plate of the raised layer. The flat plate structure formed by the positive copper plate, communication circuit module, and negative copper plate is confined within the raised layer. The front surfaces of the positive and negative copper plates, exposed from the two clearance slots, are in contact with the back surfaces of the positive and negative copper plates of the battery management system module. The plug housing is also provided with a wiring hole, located between the two clearance slots, through which the communication cable extends. On the back of the base plate of the overhead layer, a protective wall with an shape matching the outer wall of the plug is also formed. The plug is located in the space enclosed by the protective wall. The space enclosed by the protective wall is connected to the overhead layer. Each of the conductor plugs at the first end of the plug is respectively connected to each of the conductor sockets of the flat plate structure located in the overhead layer.

4. The lithium-ion battery according to claim 3, characterized in that, The housing includes a lower housing and a top housing cover. The battery pack body is encapsulated within the lower housing, the top housing cover covers the top of the lower housing, and the battery management system module is fixed to the bottom of the top housing cover. The top cover of the housing has a protrusion that extends beyond the side wall of the lower housing. The housing has a cavity with an external opening; specifically, the protrusion has a cavity. The positive and negative copper plates of the battery management system module are located on the cavity side and are in contact with the positive and negative copper plates of the plug assembly.

5. The lithium-ion battery according to claim 4, characterized in that, It also includes, The plug cover includes a fixing plate and a through hole located on the fixing plate. The fixing plate is fastened to the housing top cover located outside the cavity, the plug assembly is locked between the fixing plate and the housing top cover, and the plug surrounding the protective wall extends out from the through hole.

6. The lithium-ion battery according to claim 4, characterized in that, The plug housing has a plurality of vertically penetrating positioning holes, and the top cover of the housing has a plurality of positioning posts. The plug housing is fixed to the positioning posts by a plurality of screws, and the screws pass through each of the positioning holes and are screwed to the positioning posts.

7. The lithium-ion battery according to claim 3, characterized in that, The top plate of the elevated layer covers the connection structure between the flat plate structure and the plug.

8. The lithium-ion battery according to claim 3, characterized in that, The external connector extends out of the port in the space enclosed by the protective wall.

9. The lithium-ion battery according to claim 3, characterized in that, The flat plate structure is injection molded together with the plug housing.

10. The lithium-ion battery according to claim 9, characterized in that, The plug is injection molded together with the plug housing.

11. The lithium-ion battery according to claim 3, characterized in that, The positive copper plate of the plug-in assembly and the positive copper sheet of the battery management system module, as well as the negative copper plate of the plug-in assembly and the negative copper sheet of the battery management system module, are respectively provided with vertically aligned conductor fixing holes. A plurality of conductor screws are respectively tightened into the corresponding conductor fixing holes, thereby tightening the positive electrode copper plate and positive electrode copper sheet that are in contact with each other, and tightening the negative electrode copper plate and negative electrode copper sheet that are in contact with each other.

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