A battery module

Abstract

This invention provides a battery module including a cell assembly, an epoxy board layer, and a coating layer. A terminal wire extends from the top center of the cell assembly. The epoxy board layer is fitted onto the outer surface of the cell assembly and has recessed holes that avoid the terminal wire. The coating layer includes a first coating layer and a second coating layer. The first coating layer covers the epoxy board layer and is located on one side of the terminal wire, while the second coating layer covers the epoxy board layer and is located on the other side of the terminal wire. A sealant layer is applied to the gaps between the first and second coating layers and the terminal wire. This battery module can be used to power a cleaning robot. By designing the coating layer as a separate first and second coating layer, and combining the recessed holes on the epoxy board layer and the sealant layer at the terminal wire, the problem of uneven coverage when the terminal wire extends from the top center using traditional single thermoplastic film is solved.

Description

Technical Field

[0001] This invention relates to the technical field of battery modules, and particularly to a battery module. Background Technology

[0002] In battery module manufacturing, traditional coating processes typically use a single thermoplastic film to completely cover the outer surface of the module, with terminal wires usually designed to extend from the top edge of the module. This layout allows the thermoplastic film to completely cover all exposed surfaces of the module, forming a continuous and uninterrupted insulating barrier that effectively isolates moisture penetration, dust accumulation, and mechanical impact from the external environment, thus maintaining the stability and safety of battery operation. However, in specific applications, such as when optimizing spatial layout or meeting special electrical connection requirements, the terminal wires must extend directly from the top center of the battery module. In this case, the existing monolithic thermoplastic film structure reveals significant drawbacks: because the film itself is an indivisible continuous material, opening a hole at the top center to accommodate the terminal wires inevitably disrupts the film's structural integrity, preventing uniform adhesion during coating and leading to issues such as incomplete coverage, decreased insulation performance, and increased risks of moisture intrusion, electrical short circuits, and battery performance degradation. Summary of the Invention

[0003] The purpose of this invention is to provide a battery module that solves at least some of the problems mentioned above.

[0004] This invention provides a battery module, including a cell assembly, an epoxy board layer, and a coating layer. A terminal wire extends from the top center of the cell assembly. The epoxy board layer is sleeved on the outer surface of the cell assembly and has a recessed portion that avoids the terminal wire. The coating layer includes a first coating layer and a second coating layer. The first coating layer covers the epoxy board layer and is located on one side of the terminal wire, and the second coating layer covers the epoxy board layer and is located on the other side of the terminal wire. A sealant layer is coated between the first coating layer, the second coating layer, and the terminal wire.

[0005] Furthermore, the battery cell assembly includes a plurality of wound batteries, an upper bracket, a lower bracket, and a protection plate. The protection plate is positioned on the top surface of the upper bracket. The upper bracket and the lower bracket are detachably connected. The upper bracket is provided with a first positioning groove, and the lower bracket is provided with a second positioning groove. The plurality of wound batteries are positioned between the first positioning groove and the second positioning groove.

[0006] Furthermore, the upper bracket includes an upper mounting plate and an upper connecting column, and the lower bracket includes a lower mounting plate and a lower connecting column. The first positioning groove is provided on the lower surface of the upper mounting plate, and the second positioning groove is provided on the upper surface of the lower mounting plate. The upper connecting column and the lower connecting column are detachably connected by abutment.

[0007] Furthermore, the battery cell assembly also includes a connector, wherein the upper connecting post has a first through hole and the lower connecting post has a second through hole, one end of the connector is positioned in the first through hole and the other end of the connector is detachably connected to the second through hole.

[0008] Furthermore, the periphery of the upper connecting column is provided with a first reinforcing rib extending along the length of the upper connecting column, and the periphery of the lower connecting column is provided with a second reinforcing rib extending along the length of the lower connecting column.

[0009] Furthermore, the upper surface of the upper mounting plate is provided with a third positioning groove for positioning the protective plate, the bottom of the third positioning groove is provided with a positioning seat, the protective plate is provided with a positioning hole, and the protective plate is positioned in the positioning seat after being inserted into the positioning hole by fasteners.

[0010] Furthermore, the cell assembly also includes conductive sheets, which are used to connect several of the wound cells in series or in parallel; the upper surface of the upper mounting plate and the lower surface of the lower mounting plate are respectively provided with conductive grooves for attaching conductive sheets, and both the upper mounting plate and the lower mounting plate are provided with through holes for electrically connecting the conductive sheets to the positive and negative terminals of the battery.

[0011] Furthermore, a wiring cavity for accommodating electrical connection wires is provided between the bottom of the third positioning groove and the protective plate.

[0012] Furthermore, the epoxy board layer includes a bottom epoxy board, a side epoxy board, and a top epoxy board covering the battery cell assembly, and the recessed portion is provided on the top epoxy board.

[0013] Furthermore, the cell assembly also includes a heating film, which covers the outer surface of the wound cell and is used to preheat the wound cell in a low-temperature environment.

[0014] The beneficial effects of this plan are:

[0015] By designing the coating layer as a separate first and second coating layer, and combining it with the recessed areas on the epoxy board and the sealant layer at the terminal wires, the problem of uneven coverage when the terminal wires emerge from the top center using a traditional single thermoplastic film is solved. Therefore, this battery module ensures the integrity and sealing of the terminal wire lead-out area, effectively isolating external moisture, dust, and mechanical stress, thereby improving the overall protective performance and operational stability of the battery module. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a coated battery module;

[0017] Figure 2 This is a first exploded structural diagram of the coated battery module;

[0018] Figure 3 This is a second exploded structural diagram of the coated battery module;

[0019] Figure 4 This is a schematic diagram of the structure in which the battery pack is installed between the upper and lower brackets.

[0020] Figure 5 This is a sectional view of the connection between the upper and lower supports.

[0021] Figure 6 for Figure 5 A magnified view of a portion of circle A in the center;

[0022] Figure 7 This is a schematic diagram showing the first angle connection between the upper and lower supports;

[0023] Figure 8 This is a schematic diagram of the second angle connection between the upper and lower supports.

[0024] Figure 9 This is a schematic diagram of the structure of the first coating layer;

[0025] Figure 10 This is a schematic diagram of the structure of the second coating layer;

[0026] Figure 11 This is a schematic diagram of the structure of the third coating layer;

[0027] Figure 12 This is a schematic diagram of the epoxy board structure.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Cell assembly; 101. Terminal wire; 11. Rolled battery; 12. Upper bracket; 121. Upper mounting plate; 1211. First positioning groove; 1212. Third positioning groove; 1213. Upper conductive groove; 122. Upper connecting post; 1221. Groove; 1222. First through hole; 1223. First reinforcing rib; 13. Lower bracket; 131. Lower mounting plate; 1311. Second positioning groove; 1312. Lower conductive groove; 132. Lower connecting post; 1321. Boss; 1322. Second through hole; 1323. Second reinforcing rib; 14. Protective plate; 15. Connector; 161. Upper conductive sheet; 162. Lower conductive sheet; 171. Upper insulating sheet; 172. Lower insulating sheet; 20. First coating layer; 21. First side covering; 30. Second coating layer; 31. Second side covering; 40. Third coating layer; 41. Top covering; 50. Heating film; 60. Epoxy board layer; 61. Recessed hole; 62. Bottom epoxy board; 63. Side epoxy board; 64. Top epoxy board; 70. Sealant layer; 80. Foam layer. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this 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 a limitation of this invention; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal communication of two components. For those skilled in the art, the specific meaning of the terms in this invention can be understood according to the specific circumstances.

[0032] See Figures 1-12The battery module disclosed in this embodiment includes a cell assembly 10, an epoxy board layer 60, and a coating layer. A terminal wire 101 extends from the top center of the cell assembly 10. The epoxy board layer 60 is fitted onto the outer surface of the cell assembly 10 and has a recessed portion 61 that avoids the terminal wire 101. The coating layer includes a first coating layer 20 and a second coating layer 30. The first coating layer 20 covers the epoxy board layer 60 and is located on one side of the terminal wire 101, while the second coating layer 30 covers the epoxy board layer 60 and is located on the other side of the terminal wire 101. A sealant layer 70 is applied to the gaps between the first coating layer 20, the second coating layer 30, and the terminal wire 101. This battery module can be used to power a cleaning robot.

[0033] An epoxy board layer 60 is fitted onto the outer surface of the cell assembly 10, providing basic mechanical support and insulation protection. A film layer is used to further cover the epoxy board layer 60, providing additional insulation and moisture protection. By designing the film layer as a separate first film layer 20 and second film layer 30, and combining it with the recessed portion 61 on the epoxy board layer 60 and the sealant layer 70 at the terminal wire 101, the problem of uneven coverage when the terminal wire 101 is led out from the top center using a traditional single thermoplastic film is solved. Therefore, this battery module can ensure the integrity and sealing of the terminal wire 101 lead-out area, effectively isolating external moisture, dust, and mechanical stress, thereby improving the overall protective performance and operational stability of the battery module.

[0034] The first positioning groove 1211 is a recessed structure located on the side of the upper mounting plate 121 facing the battery pack. Its shape and size match one end of the battery pack, providing partial coverage and support for that end. The first positioning groove 1211 can be directly formed on the upper mounting plate 121 by injection molding, stamping, or machining to ensure its integration with the upper mounting plate 121. The second positioning groove 1311 is correspondingly located on the side of the lower mounting plate 131 facing the battery pack. Its structure and function are similar to the first positioning groove 1211, serving to accommodate the other end of the battery pack. By precisely embedding both ends of the battery pack into the first positioning groove 1211 and the second positioning groove 1311 respectively, precise alignment and fixation of the battery pack within the battery module can be achieved. This accommodating method effectively constrains the battery pack in both the vertical and horizontal directions, greatly limiting its movement under external vibration or impact.

[0035] In one embodiment, the battery cell assembly 10 includes a plurality of wound battery cells 11, an upper bracket 12, a lower bracket 13, and a protective plate 14. The protective plate 14 is positioned on the top surface of the upper bracket 12. The upper bracket 12 and the lower bracket 13 are detachably connected. The upper bracket 12 is provided with a first positioning groove 1211, and the lower bracket 13 is provided with a second positioning groove 1311. The plurality of wound battery cells 11 are positioned between the first positioning groove 1211 and the second positioning groove 1311. The upper bracket 12 and the lower bracket 13 are detachably connected to form a stable frame, and the first positioning groove 1211 and the second positioning groove 1311 provided thereon are used to accurately and stably position the plurality of wound battery cells 11. This design effectively avoids the shaking or displacement of the wound battery cells 11 inside the module due to vibration or impact, thereby significantly improving the vibration and impact resistance of the battery module. Meanwhile, the protection board 14 is reliably positioned on the top surface of the upper bracket 12, which not only facilitates electrical connection with external circuits and achieves effective heat dissipation, but also makes the assembly, testing, and maintenance of the entire cell assembly 10 more convenient and efficient. Overall, this structural design significantly improves the overall structural stability, operational reliability, and production efficiency of the battery module, ensuring the safe and stable operation of the battery under various complex operating conditions.

[0036] In one embodiment, the upper bracket 12 includes an upper mounting plate 121 and an upper connecting post 122, and the lower bracket 13 includes a lower mounting plate 131 and a lower connecting post 132. A first positioning groove 1211 is provided on the lower surface of the upper mounting plate 121, and a second positioning groove 1311 is provided on the upper surface of the lower mounting plate 131. The upper connecting post 122 and the lower connecting post 132 are detachably connected by mating. The upper mounting plate 121 and the upper connecting post 122 are integrally formed, and the lower mounting plate 131 and the lower connecting post 132 are integrally formed.

[0037] The upper bracket 12 and lower bracket 13 are symmetrically designed. The upper mounting plate 121 and lower mounting plate 131 have the same structure, and the upper connecting column 122 and lower connecting column 132 have the same length. The upper bracket 12 and lower bracket 13 have basically the same structure, which facilitates uniform processing and shaping during manufacturing. Then, the grooves 1221 or bosses 1321 can be processed separately, improving production efficiency. At the same time, the purpose of the upper connecting column 122 and lower connecting column 132 is to support and connect the upper mounting plate 121 and lower mounting plate 131. The positioning of the winding battery 11 only requires positioning at the upper and lower ends of the winding battery 11, reducing the components and materials for side positioning and simplifying the positioning structure of the winding battery 11.

[0038] In one embodiment, the protruding end of the upper connecting post 122 is provided with a groove 1221, and the protruding end of the lower connecting post 132 is provided with a boss 1321, which is inserted into the groove 1221. The cross-sectional shape of the boss 1321 can correspond to the groove 1221; for example, a circular boss 1321 fits into a circular groove 1221, and a square boss 1321 fits into a square groove 1221. The outer wall of the boss 1321 can be designed with appropriate chamfers or tapers to facilitate its smooth insertion into the groove 1221 and reduce resistance during assembly. The fit tolerance between the boss 1321 and the groove 1221 is optimized to provide sufficient tightness while ensuring easy insertion and preventing loosening of the connection. Finally, the boss 1321 is inserted into the groove 1221, which means that the boss 1321 of the lower connecting post 132 enters the groove 1221 of the upper connecting post 122 through axial movement, forming a male-female mating connection. This plug-in connection not only provides structural support, but also achieves precise alignment between the connectors 15 through the contact between the boss 1321 and the inner wall of the groove 1221.

[0039] The groove 1221 of the upper connecting post 122 and the boss 1321 of the lower connecting post 132 form a precise plug-in mating structure. During assembly, the boss 1321 is effectively guided by the groove 1221, greatly simplifying alignment and improving the installation efficiency and convenience of the battery module. Once plugged in, the tight fit between the boss 1321 and the groove 1221 effectively limits the relative displacement between the upper connecting post 122 and the lower connecting post 132, significantly enhancing the stability and reliability of the connection and effectively preventing loosening or detachment due to external factors such as vibration and impact during transportation or use. Furthermore, this plug-in structure can withstand certain axial and radial loads, further improving the overall structural strength and durability of the battery module and ensuring its safe and stable operation.

[0040] In one embodiment, the battery cell assembly 10 further includes a connector 15, with a first through hole 1222 in the upper connecting post 122 and a second through hole 1322 in the lower connecting post 132. One end of the connector 15 is positioned in the first through hole 1222, and the other end of the connector 15 is detachably connected to the second through hole 1322.

[0041] When the groove 1221 of the upper connecting post 122 is inserted into the boss 1321 of the lower connecting post 132, the connector 15 can pass through the first through hole 1222 in the upper connecting post 122 and the second through hole 1322 in the lower connecting post 132, thereby firmly locking the upper connecting post 122 and the lower connecting post 132 together. This design effectively solves the problem of unstable connection that may be caused by relying solely on the insertion fit, significantly enhances the structural stability and reliability of the battery module under vibration or shock environments, and avoids the risk of accidental detachment of the battery module. At the same time, due to the detachability of the connector 15, this solution can still maintain the easy installation and maintenance characteristics of the battery module, providing a high-strength connection without affecting subsequent disassembly and maintenance operations.

[0042] Specifically, the connector 15 in this solution is a fastening screw, and both the first through hole 1222 and the second through hole 1322 are provided with internal thread structures adapted to the fastening screw. During battery pack installation, the battery pack is first positioned between the upper bracket 12 and the lower bracket 13. Then, a fastening tool carrying the fastening screw is inserted into the first through hole 1222 and connected to the second through hole 1322 to achieve stable positioning of the upper bracket 12 and the lower bracket 13, greatly simplifying the battery pack installation process.

[0043] In one embodiment, the periphery of the upper connecting column 122 is provided with a first reinforcing rib 1223 that is opened along the length direction of the upper connecting column 122, and the periphery of the lower connecting column 132 is provided with a second reinforcing rib 1323 that is opened along the length direction of the lower connecting column 132.

[0044] By providing a first reinforcing rib 1223 and a second reinforcing rib 1323 along their length directions on the periphery of the upper connecting column 122 and the lower connecting column 132 respectively, the overall structural strength and rigidity of the connecting columns are significantly enhanced. This effectively solves the problem of deformation or unstable connection that may occur when the connecting columns are subjected to external stress, making the detachable connection between the upper connecting column 122 and the lower connecting column 132 more robust and reliable.

[0045] In one embodiment, the upper surface of the upper mounting plate 121 is provided with a third positioning groove 1212 for the positioning protection plate 14, the bottom of the third positioning groove 1212 is provided with a positioning seat, the protection plate is provided with a positioning hole, and the protection plate is positioned in the positioning seat after being inserted into the positioning hole by fasteners.

[0046] The protection board 14 is securely housed within the third positioning groove 1212 of the upper mounting plate 121 and positioned by fasteners, which significantly improves the installation stability and protection level of the protection board 14. Simultaneously, both the battery pack and the protection board 14 are positioned via the upper mounting plate 121, forming a unified installation unit and reducing the risk of poor contact between them.

[0047] In one embodiment, the battery module further includes an upper conductive sheet 161 and a lower conductive sheet 162. The upper conductive sheet 161 is positioned on the upper mounting plate 121 for electrically connecting one end of the battery pack, and the lower conductive sheet 162 is positioned on the lower mounting plate 131 for electrically connecting the other end of the battery pack. Both the upper conductive sheet 161 and the lower conductive sheet 162 are nickel sheets. This design makes the electrical connection process of the battery pack more standardized and convenient, avoiding complex wiring or direct soldering, thereby significantly improving the installation efficiency and maintainability of the battery module.

[0048] In one embodiment, the upper surface of the upper mounting plate is provided with an upper conductive groove 1213 for positioning the upper conductive piece 161, and the lower surface of the lower mounting plate is provided with a lower conductive groove 1312 for positioning the lower conductive piece 162. The upper mounting plate is provided with an upper through hole for electrically connecting the upper conductive piece 161 to one end of the battery pack, and the lower mounting plate is provided with a lower through hole for electrically connecting the lower conductive piece 162 to the other end of the battery pack.

[0049] In this design, there are multiple upper conductive sheets 161 and lower conductive sheets 162, and the number and size of upper conductive grooves 1213 and lower conductive grooves 1312 correspond one-to-one with the conductive sheets. Each conductive sheet is used to connect adjacent individual batteries. As an independent conductive component, the conductive sheet optimizes contact pressure and contact area, effectively reducing contact resistance and ensuring the stability and reliability of current transmission. It also reduces the risk of connection failure due to assembly stress or vibration, thereby improving the electrical performance and long-term operational stability of the entire battery module.

[0050] In one embodiment, the battery module further includes an upper insulating sheet 171 and a lower insulating sheet 172. The upper insulating sheet 171 is disposed between the upper conductive sheet 161 and the protection plate 14, and the lower insulating sheet 172 is disposed between the lower conductive sheet 162 and the epoxy board layer 60. The upper insulating sheet 171 isolates the upper conductive sheet 161 from the protection plate 14, avoiding the risk of short circuits that may result from direct contact. The lower insulating sheet 172 isolates the lower conductive sheet 162 from the external environment, effectively preventing the influence of the external environment on the internal live components of the battery module. This significantly improves the electrical safety and reliability of the battery module, reduces the probability of leakage and short circuit faults, and thus extends the service life of the battery module.

[0051] In one embodiment, a wiring cavity for accommodating electrical connection wires is provided between the bottom of the third positioning groove 1212 and the protective plate 14. The wiring cavity is a channel or space specifically reserved for electrical connection wires. Its main function is to provide a safe and orderly wiring environment for the electrical connection wires, avoiding unnecessary mechanical stress such as compression, friction, or pulling on the wires inside the battery module. The wiring cavity cleverly utilizes the space below the protective plate 14 and above the upper mounting plate 121, without occupying additional external space, and effectively protecting the internal electrical connection wires, neatly storing these different types of electrical connection wires and preventing them from being scattered randomly, thereby avoiding potential problems such as wire tangling and short circuits.

[0052] In one embodiment, the epoxy board layer 60 includes a bottom epoxy board 62, side epoxy boards 63, and a top epoxy board 64 covering the battery cell assembly 10, with recessed portions 61 provided on the top epoxy board 64. The bottom epoxy board 62, side epoxy boards 63, and top epoxy board 64 are pre-designed in size and then fixed with fiberglass tape to form a rectangular outer cover. Decomposing the epoxy board layer 60 into the bottom epoxy board 62, side epoxy boards 63, and top epoxy board 64 significantly reduces the manufacturing complexity and production cost of the epoxy board layer 60, and improves the processing accuracy and production efficiency of each component. To ensure the safety and stability of installation and use, a foam layer 80 is provided between the top epoxy board 64 and the protective plate, and between the bottom epoxy board 62 and the lower insulating film.

[0053] In one embodiment, the cell assembly 10 further includes a heating film 50, which covers the outer surface of the wound cell 11 and is used to preheat the battery pack in a low-temperature environment.

[0054] By employing the aforementioned technical solution, a heating film 50 is incorporated into the cell assembly 10 and covers the outer surface of the wound battery 11, enabling preheating of the wound battery 11 in low-temperature environments. When the ambient temperature is low, the heating film 50 activates, directly and efficiently transferring heat to the wound battery 11, rapidly raising the battery's internal temperature to its optimal operating range. This effectively solves the problem of significant performance degradation in low-temperature environments, ensuring normal startup and efficient charging and discharging of the battery module under cold conditions, thereby significantly improving the reliability, stability, and overall lifespan of the battery module. Furthermore, precise control of the heating process can prevent irreversible damage to the battery caused by overcooling, further ensuring the safe operation of the battery module.

[0055] In one embodiment, the battery module further includes a third coating layer 40, which is located outside the first coating layer 20 and the second coating layer 30, and is used to cover the other surfaces of the cell assembly 10 except for the top surface.

[0056] The encapsulated battery module with a centrally exiting terminal in this embodiment divides the top surface of the cell assembly 10 into multiple regions and uses a first encapsulation layer 20, a second encapsulation layer 30, and a third encapsulation layer 40 to collaboratively encapsulate these regions. This effectively solves the problem of traditional integral encapsulation methods failing to achieve complete encapsulation when the terminal line 101 extends from the center of the top of the battery module. This design ensures comprehensive protection for the cell assembly 10 with the terminal line 101 exiting from the center, improves the module's encapsulation integrity, moisture resistance, and structural stability, thereby extending the battery module's lifespan and enhancing its reliability in complex environments.

[0057] In this scheme, the first coating layer 20, the second coating layer 30, and the third coating layer 40 are all heat-shrinkable films.

[0058] In one embodiment, the cell assembly 10 is a square cell assembly 10, and the third coating layer 40 covers the bottom surface, two surfaces and two sides of the square cell.

[0059] "Square cell" refers to a cell assembly 10 with a prismatic appearance, typically exhibiting a rectangular or square cross-section. This cell shape is a common packaging form in the lithium-ion battery field, characterized by high energy density, excellent space utilization, and a regular planar surface, facilitating assembly and packaging. Using it as the specific form of the cell assembly 10 provides a clear physical basis for the overall design and manufacturing of the module, contributing to standardized production.

[0060] The third coating layer 40 precisely covers the main exposed surfaces of the square battery cells, ensuring comprehensive and reliable physical protection and electrical insulation for the cell body. This effectively resists the erosion of the external environment (such as moisture and dust) and mechanical impact, significantly improving the long-term stability and safety of the battery module. Furthermore, this clear coating method provides a clear boundary for the precise positioning and effective sealing of the first coating layer 20 and the second coating layer 30 in the top area, ensuring the integrity and synergistic effect of the entire coating structure.

[0061] In one embodiment, the third coating layer 40 further includes a top covering portion 41 covering the periphery of the top surface. By providing the top covering portion 41 in the third coating layer 40, the third coating layer 40 not only covers the bottom surface, two surfaces, and two sides of the cell assembly 10, but also effectively covers the periphery of the top surface of the cell assembly 10. This significantly enhances the sealing performance of the top edge area of ​​the cell assembly 10, effectively preventing the intrusion of external moisture, dust, and other harmful substances, thereby reducing the risk of internal short circuits or corrosion within the battery module. Simultaneously, the top covering portion 41 also provides additional mechanical protection for the top edge, reducing edge wear or impact damage that may occur during handling, installation, or use.

[0062] In one embodiment, the first coating layer 20 is a loop-shaped film layer, which covers the first region, both surfaces, and the bottom surface. The second coating layer 30 is a loop-shaped film layer, which covers the second region, both surfaces, and the bottom surface.

[0063] Both the first and second coating layers 20 and 30 are U-shaped layers, facilitating the insertion of the square battery cells from the left and right sides respectively. The third coating layer 40 is then inserted into the square battery cells from the bottom. The coating process is simple, and the overall structure has good sealing performance. The U-shaped coating structure significantly enhances the overall mechanical strength and impact resistance of the battery cell assembly 10, providing more comprehensive insulation protection for the battery cell assembly 10 and effectively blocking the intrusion of external environmental factors such as moisture and dust, thereby improving the long-term reliability and safety of the battery module.

[0064] Furthermore, the first coating layer 20 also includes a first side coating portion 21 covering the periphery of one side. The second coating layer 30 also includes a second side coating portion 31 covering the periphery of the other side.

[0065] Based on the first and second sheathing layers 20 and 30 being U-shaped films, a first side covering portion 21 and a second side covering portion are added, covering one side of the battery cell assembly 10. This provides a more comprehensive and tighter seal on the side, while preventing the first and second sheathing layers 20 from detaching. This effectively compensates for any blind spots in side protection that might exist with only the U-shaped film, significantly improving the overall sealing and insulation performance of the battery module. The first side covering portion 21 effectively prevents external moisture, dust, or other contaminants from entering the battery cell assembly 10, while also enhancing the mechanical strength and impact resistance of this area, thereby extending the battery module's lifespan and improving its operational reliability and safety in complex environments.

[0066] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A battery module, characterized in that, include: A battery cell assembly, wherein a terminal wire extends from the top center of the battery cell assembly; An epoxy board layer is sleeved on the outer surface of the battery cell assembly, and the epoxy board layer has a recessed hole that avoids the terminal wire; The coating layer includes a first coating layer and a second coating layer. The first coating layer covers the epoxy board layer and is located on one side of the terminal wire. The second coating layer covers the epoxy board layer and is located on the other side of the terminal wire. A sealant layer is applied to the gap between the first coating layer, the second coating layer and the terminal wire. The battery cell assembly includes a plurality of wound batteries, an upper bracket, a lower bracket, and a protection plate. The protection plate is positioned on the top surface of the upper bracket. The upper bracket and the lower bracket are detachably connected. The upper bracket is provided with a first positioning groove, and the lower bracket is provided with a second positioning groove. The plurality of wound batteries are positioned between the first positioning groove and the second positioning groove. The upper bracket includes an upper mounting plate and an upper connecting column, and the lower bracket includes a lower mounting plate and a lower connecting column. The first positioning groove is provided on the lower surface of the upper mounting plate, and the second positioning groove is provided on the upper surface of the lower mounting plate. The upper connecting column and the lower connecting column are detachably connected by abutment. The upper connecting column is provided with a first reinforcing rib along the length of the upper connecting column, and the lower connecting column is provided with a second reinforcing rib along the length of the lower connecting column. The cell assembly also includes a heating film, which covers the outer surface of the wound battery and is used to preheat the battery pack in a low-temperature environment.

2. The battery module according to claim 1, characterized in that, The battery cell assembly also includes a connector. The upper connector has a first through hole, and the lower connector has a second through hole. One end of the connector is positioned in the first through hole, and the other end of the connector is detachably connected to the second through hole.

3. The battery module according to claim 1, characterized in that, The upper surface of the upper mounting plate is provided with a third positioning groove for positioning the protective plate. The bottom of the third positioning groove is provided with a positioning seat. The protective plate is provided with a positioning hole. The protective plate is positioned in the positioning seat after being inserted into the positioning hole by fasteners.

4. The battery module according to claim 3, characterized in that, The cell assembly also includes conductive sheets, which are used to connect several of the wound cells in series or in parallel; the upper surface of the upper mounting plate and the lower surface of the lower mounting plate are respectively provided with conductive grooves for attaching conductive sheets, and both the upper mounting plate and the lower mounting plate are provided with through holes for electrically connecting the conductive sheets to the positive and negative terminals of the battery.

5. The battery module according to claim 3, characterized in that, The bottom of the third positioning groove and the protective plate are provided with a wiring cavity for accommodating electrical connection wires.

6. The battery module according to claim 1, characterized in that, The epoxy board layer includes a bottom epoxy board, a side epoxy board, and a top epoxy board covering the battery cell assembly, and the recessed portion is provided on the top epoxy board.

Images