Battery pack mounting structure

Abstract

The invention relates to a battery pack mounting structure which comprises a battery pack module and a box body, a battery pack, a circuit board, a battery pack contact piece and the like are integrated in a battery pack shell to form an independent battery pack module, and the battery pack module is detachably mounted in the box body, so that the requirements of the battery pack on detachability and easiness in replacement can be met; meanwhile, a sealing structure is designed between the battery pack module and the bottom of the box body, and a stop structure is matched with a sealing ring, so that the waterproof sealing requirement of a use environment is met.

Description

Technical Field

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

[0002] In the mining industry, battery packs are widely used in various mining equipment due to their portability. The working environment in mines is harsh. According to the requirements of the use environment, battery packs must meet the requirements of waterproofing and sealing while meeting the installation requirements. At present, the installation method of battery packs used in mining is usually: the battery pack is placed in the box, and then the battery pack and the box are integrated into a structure by glue filling. Although the battery pack using this installation method can meet the waterproofing and sealing requirements to a certain extent, the integrated structure after glue filling cannot be disassembled and replaced, and the maintenance cost is high.

[0003] In the prior art, there are solutions in other fields that use a battery pack that can be detachably installed in a box, but these solutions are mostly used in indoor environments or ordinary environments, and do not require or have low requirements for waterproof sealing performance. The installation structure cannot meet the use requirements in harsh environmental conditions such as mining equipment. Summary of the invention

[0004] In view of the defects of the prior art, the present invention provides a battery pack installation structure, in which the battery pack and the box body are detachably connected and can meet the waterproof sealing requirements of the battery pack.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A battery pack installation structure includes a box and a battery pack module, the battery pack module includes a battery pack shell, a battery pack, a circuit board and a battery pack contact, the battery pack and the circuit board are installed in the battery pack shell, the battery pack contact is installed on the bottom surface of the battery pack shell, the top surface of the box is open, and a contact module corresponding to the battery pack contact is installed on the bottom of the box, and the battery pack module is detachably installed in the box and sealed by a sealing structure.

[0006] Furthermore, after the battery pack, the circuit board and the battery pack contact are installed in place in the battery pack shell, glue is poured into the battery pack shell to fix and seal the components to form the battery pack module.

[0007] Furthermore, on the bottom outer surface of the battery pack shell, a circle of flanges protruding from the bottom outer surface is provided around the area where the battery pack contacts are located, and a groove matching the flange is provided on the bottom surface of the box body. The contact module at the bottom of the box body is installed in the area surrounded by the groove. The flange and the groove form a stop structure on the periphery of the contact matching area to play a water-blocking role.

[0008] Further, a radial sealing ring is provided on the stop structure.

[0009] Further, the radial sealing ring is installed on the outer peripheral surface of the flange, and can achieve radial sealing between the flange and the groove.

[0010] Further, an axial sealing ring is provided inside the stop structure.

[0011] Further, the axial sealing ring is arranged on the outer surface of the bottom of the battery pack housing between the inner side of the flange and the outer periphery of the battery pack contact member, and can achieve axial sealing of the contact member mating area.

[0012] Further, the cross-section of the axial sealing ring is in the shape of "H".

[0013] Further, one end of the battery pack contact member is located inside the battery pack housing and is connected to the circuit board, and the other end of the battery pack contact member is located outside the bottom of the battery pack housing.

[0014] Further, the area of the bottom surface of the battery pack housing where the battery pack contact member is installed bulges outward as a whole to form a space for avoiding the battery pack contact member.

[0015] Further, the battery pack contact member is a pin, and the bottom surface of the pin is a flat surface.

[0016] Further, the contact member on the contact member module is a spring pin or a flexible printed circuit, and after the battery pack module is installed in place in the box body, the battery pack contact member is in contact and cooperation with the spring pin or the flexible printed circuit on the box body.

[0017] Further, the flexible printed circuit is a double-layer flexible printed circuit, and the outer layer flexible printed circuit and the inner layer flexible printed circuit are made of different materials.

[0018] Further, a mounting groove is recessed at the position corresponding to the contact member module on the lower side of the bottom surface of the box body for accommodating and installing the box body circuit board, and the contact member module is connected to the box body circuit board.

[0019] Further, the battery pack module is fixed to the box body from the bottom surface or the top surface, and the fixing methods include but are not limited to bolts and nuts, buckles, self-tapping screws.

[0020] Further, fixing columns extending downward are respectively arranged on both sides of the bottom of the battery pack housing, mounting holes are provided at the positions corresponding to the fixing columns on the bottom surface of the box body, and bolts pass through the mounting holes and cooperate with the fixing columns to realize the fixing of the battery pack housing and the box body.

[0021] Further, a threaded hole is provided inside the fixing column, and the threaded hole cooperates with the bolt, and the bolt hole is not communicated with the inside of the battery pack housing.

[0022] Further, a nut is provided inside the fixing column, and the bolt passes through the mounting hole and mates with the nut inside the fixing column.

[0023] Further, the top surface of the battery pack housing extends around to form a convex edge, and the convex edge is used to limit the installation direction of the battery pack module. When the lower surface of the convex edge fits with the top surface of the box body, the battery pack module is installed in place in the box body.

[0024] Further, screws are provided on the convex edge to connect with the top surface of the box body, so as to fix the battery pack module to the box body.

[0025] Further, an anti-misassembly structure is provided between the battery pack housing and the box body, and the anti-misassembly structure is realized by asymmetric structures provided on the battery pack housing and the box body.

[0026] Further, the asymmetric structure includes: a convex strip extending along the installation direction on one side of the battery pack housing, and a guide groove corresponding to the convex strip provided on the box body.

[0027] Further, convex ribs are provided on the inner wall of the box body along the installation direction of the battery pack module.

[0028] Further, all or part of the side wall of the box body wraps the battery pack module.

[0029] Beneficial effects: 1. Through structural improvement, the present invention designs a battery pack housing outside the battery pack, integrates the battery pack, circuit board, etc. into the battery pack housing to form an independent module, modularizes the battery pack and installs it in the external box body in a detachable manner, which can meet the installation and detachable replacement requirements. At the same time, a sealing structure is designed to meet the waterproof sealing requirements of the battery pack module.

[0030] 2. Inside the battery pack housing, the present invention effectively seals the battery pack and the circuit board through potting treatment. A special stop structure design is adopted between the battery pack module and the box body, using the cooperation of a flange and a groove to effectively stop the contact part fitting area, and cooperating with a radial sealing structure or an axial sealing structure to ensure a reliable sealing effect and meet the waterproof sealing use requirements under harsh environments.

[0031] 3. The present invention sets a convex edge at the top of the battery pack housing, a fixing structure at the bottom or top, an anti-misassembly design between the box body and the battery pack module, and a series of structural improvements such as convex ribs provided inside the box body, making the battery pack installation structure simple, compact, easy to install, stable and reliable, capable of realizing modular assembly of the battery pack, and having the characteristics of being detachable, easy to replace, and low maintenance cost. Description of the Drawings

[0032] Figure 1Schematic diagram of the battery pack installation structure according to an embodiment of the present invention (separated state); Figure 2 Schematic diagram of the battery pack installation structure according to an embodiment of the present invention (assembled state); Figure 3 Schematic diagram of the structure of the battery pack module according to an embodiment of the present invention; Figure 4 Schematic diagram of the structure of the battery pack housing according to an embodiment of the present invention; Figure 5 Schematic cross-sectional view of the battery pack module according to an embodiment of the present invention; Figure 6 Schematic diagram of the structure of the battery pack module from the bottom perspective according to an embodiment of the present invention; Figure 7 Schematic diagram of the structure of the box according to an embodiment of the present invention; Figure 8 Schematic cross-sectional view of the box according to an embodiment of the present invention; Figure 9 Schematic cross-sectional view of the battery pack installation structure according to an embodiment of the present invention; Figure 10 Schematic diagram of the first solution of the box contact part module according to an embodiment of the present invention; Figure 11 Schematic diagram of the second solution of the box contact part module according to an embodiment of the present invention; Figure 12 Schematic diagram of the anti-misassembly structure of the battery pack installation structure according to an embodiment of the present invention; Figure 13 Schematic cross-sectional view of the battery pack installation structure according to an embodiment of the present invention; Figure 14 Schematic diagram of the semi-wrapping method of the box according to an embodiment of the present invention.

[0033] Reference numerals: 100 Battery pack module, 101 Battery pack housing, 102 Battery pack, 103 Circuit board, 104 Battery pack contact part, 105 Flange, 106 Radial sealing ring, 107 Axial sealing ring, 108 Flange edge, 109 Fixed column, 110 Nut, 111 Rib; 200 Box, 201 Contact part module, 202 Spring pin, 203 Elastic piece, 204 Groove, 205 Boss, 206 Mounting hole, 207 Mounting groove, 208 Rib, 209 Guide groove, 210 Notch, 211 Protrusion, 212 Bolt. Detailed implementation manners

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present invention. The components shown in the drawings only relate to those of the present invention, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the layout type of its components may also be more complex.

[0035] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed by the present invention can cover.

[0036] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential", "top", "bottom", etc. cited in this specification is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplified description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as an absolute limitation to the present invention.

[0037] As Figure 1-2 shown, the battery pack mounting structure in this embodiment includes a battery pack module 100 and a box body 200. The box body 200 has an opening at the top. The battery pack module 100 is used as an independent module and is detachably inserted into the box body 200 through the opening at the top of the box body 200 and fixed by a fixing structure. The state after the battery pack module 100 is inserted into the box body 200 is as Figure 2 shown, where Figure 2 (a) and Figure 2 (b) are respectively schematic structural diagrams shown from different angles.

[0038] As Figures 3-6As shown, the battery pack module 100 includes a battery pack housing 101, a battery pack 102, a circuit board 103, and a battery pack contact 104. The battery pack housing 101 is a housing structure that matches the shape of the box body 200. There is an opening on the side of the housing, and the internal space is used to place the battery pack 102 and the circuit board 103. The internal space of the battery pack housing 101 is usually adapted to the size of the battery pack 102 to be placed, so that the structure is compact and reasonable. The battery pack contact 104 is installed on the bottom surface of the battery pack housing 101. In order to prevent interference between the battery pack contact 104 and the battery pack 102 inside the housing after installation, the part of the bottom surface of the battery pack housing 101 where the battery pack contact 104 is installed protrudes downward as a whole, so as to form a space for avoiding the battery pack contact 104 between the battery pack 102 and the bottom surface of the battery pack housing 101.

[0039] The battery pack 102 and the circuit board 103 are respectively inserted into the battery pack housing 101 from the side opening. The circuit board 103 is placed on the side of the battery pack 102 and is connected to the battery pack 102. The battery pack contact 104 is installed on the bottom surface of the battery pack housing 101. The upper end of the battery pack contact 104 extends into the battery pack housing 101 and is connected to the circuit board 103 through a circuit. The lower end of the battery pack contact 104 is located outside the bottom surface of the battery pack housing 101. When all components such as the battery pack 102, the circuit board 103, and the battery pack contact 104 are installed in place on the battery pack housing 101, glue is poured into the battery pack housing 101 from the side opening, and a flat glue pouring surface is formed at the side opening to fix and seal all components, forming the battery pack module 100.

[0040] Corresponding to the battery pack contact 104 at the bottom of the battery pack module 100, as Figures 7-8 shown, a contact module 201 is installed on the bottom surface of the box body 200 for cooperation and conduction with the contact at the bottom of the battery pack module 100; since the battery pack contact 104 of the battery pack module 100 cooperates with the contact module 201 of the box body 200 externally, in order to meet the waterproof and sealing requirements of the battery pack module 100 during use, a sealing structure is designed between the battery pack module 100 and the bottom of the box body 200 to achieve waterproof and sealing of the contact cooperation area.

[0041] As Figures 3-9As shown, on the outer surface of the bottom of the battery pack housing 101, around the area where the battery pack contact 104 is located, there is a flange 105 protruding from the outer surface of the bottom; correspondingly, on the bottom surface of the box body 200, there is a groove 204 adapted to the flange 105. The arrangement of the groove 204 causes a boss 205 to be formed at the bottom of the box body 200 inside the groove 204. The contact module 201 is installed on the boss 205. When the battery pack module 100 is installed in the box body 200, the flange 105 and the groove 204 form a stop structure on the outer periphery of the contact fitting area, which plays a role in blocking water.

[0042] To improve the sealing performance, a radial sealing ring 106 is provided on the stop structure; specifically, the radial sealing ring 106 is installed on the outer peripheral surface of the flange 105, and can achieve the sealing fit between the outer peripheral surface of the flange 105 and the side wall of the groove 204, thereby ensuring the radial seal of the contact fitting area.

[0043] Alternatively, an axial sealing ring 107 is provided inside the stop structure; the axial sealing ring 107 is arranged on the outer surface of the bottom of the battery pack housing 101 between the outer periphery of the battery pack contact 104 and the inner side of the flange 105. When the battery pack module 100 is installed into the box body 200, the inner surface of the bottom of the box body 200 presses the axial sealing ring 107, and can achieve the seal of the contact surface between the bottom of the battery pack housing 101 and the bottom of the box body 200, thereby ensuring the axial seal of the contact fitting area.

[0044] The axial seal will generate a force opposite to the installation direction of the battery pack module 100, making the insertion force increase when the battery pack 102 module 100 is installed. Therefore, the cross-section of the axial sealing ring 107 is in an "H" shape. The sealing ring with this cross-sectional shape can reduce the resistance when the battery pack module 100 is installed to a certain extent without affecting the sealing effect.

[0045] The sealing direction of the axial seal is located in the installation direction of the battery pack module 100. Therefore, the installation and cooperation requirements between the battery pack module 100 and the box body 200 for the axial seal are relatively high. When the battery pack module 100 is not installed in place, the axial seal is likely to fail; in actual use, technicians can, according to actual needs, adopt the axial seal, the radial seal or the combined use of the axial seal and the radial seal between the battery pack module 100 and the box body 200 to meet the waterproof seal of the contact fitting area.

[0046] Thus, after the battery pack module 100 is installed in the box body 200, since the battery pack module 100 itself has been treated with potting, the sealing performance of the battery pack housing 101 and its internal components is ensured. The contact member mating area at the bottom is sealed through a stop structure and a sealing ring, thereby fully ensuring the waterproof and sealing performance of the battery pack installation structure and enabling it to meet the waterproof and sealing performance requirements under harsh environments.

[0047] After the battery pack module 100 is installed in place in the box body 200, the battery pack contact member 104 mates with the contact member module 201 on the bottom surface of the box body 200 to achieve conduction of the contact members. In this embodiment, the battery pack contact member 104 is a pin. Multiple pins are installed on the bottom surface of the battery pack housing 101, and the bottom surface of the pin is a flat surface, which is convenient for mating with the contact member module 201 on the box body 200; the contact members installed on the contact member module 201 of the box body 200 are spring pins 202 or elastic sheets 203. The spring pins 202 or elastic sheets 203 correspond to the pins one by one. When the battery pack module 100 is installed in place, the bottom surface of the pin presses down on the spring pin 202 or elastic sheet 203 structure, thereby achieving connection.

[0048] An installation opening for the contact member module 201 is provided on the boss 205 in the bottom groove 204 of the box body 200. The installation opening matches the outer shape of the contact member module 201 to achieve the installation and positioning of the contact member module 201. In Figure 7 Figs. - 11 respectively show structural diagrams of the contact member module 201 using spring pins 202 or elastic sheets 203 as contact members. It should be noted that the illustrated structures are only examples. In actual applications, the contact member module 201 can be installed in the installation opening according to needs by selecting the illustrated structure or other suitable shapes and positioning methods.

[0049] The structure of the contact member module 201 using spring pins 202 is as Figures 7-10 shown. In the embodiment shown in Figures 7-10 , the contact member module 201 has an overall stepped structure with a larger bottom and a smaller top, and multiple protrusions 211 are provided on the side wall of the contact member module 201. An installation opening for the contact member module 201 is provided on the boss 205 in the bottom groove 204 of the box body 200. The installation opening matches the outer shape of the contact member module 201. The contact member module 201 is installed from bottom to top to the bottom of the box body 200, positioned by the steps, and fixed in the installation opening located on the boss 205 through an interference fit formed by the protrusions 211.

[0050] In another solution of the contact member module 201, the contact member of the contact member module 201 uses an elastic sheet 203. As Figure 11 shown is a structural schematic diagram of the contact member module 201 using an elastic sheet 203. In Figure 11In the illustrated embodiment, the contact module 201 has an overall stepped structure that is larger at the top and smaller at the bottom. The mounting opening on the bottom boss 205 of the box body 200 matches the outer shape of the contact module 201. The contact module 201 is installed from top to bottom on the bottom of the box body 200 and is fixed to the bottom of the box body 200 by the pressing force after the battery pack module 100 is installed.

[0051] When used in a vibrating environment, the elastic piece 203 is prone to fatigue, resulting in a reduced elastic effect. To ensure the elastic effect, the elastic piece 203 is designed as a double-layer elastic piece 203 inside and outside. Among them, the outer elastic piece 203 is in direct contact with the pin, and good electrical conductivity is required. Generally, copper alloy is selected as the material. The inner elastic piece 203 is required to have good elasticity, and generally stainless steel is selected as the material. The cooperation of the double-layer elastic piece 203 inside and outside can not only ensure elasticity but also ensure effective electrical conduction.

[0052] Furthermore, as Figure 7 shown, a mounting groove 207 is integrally recessed on the lower side of the bottom surface of the box body 200 corresponding to the position of the contact module 201 for accommodating and installing a box body circuit board (not shown in the figure). The bottom end of the contact on the contact module 201 is connected to the box body circuit board.

[0053] After the battery pack module 100 is installed in the box body 200, it needs to be fixed by a fixing structure to ensure stability during use. During the process of installing the battery pack module 100 into the box body 200 from top to bottom, it will press down the contacts and the sealing structure on the box body 200, thus generating an upward resilience force. Therefore, a downward binding force needs to be applied to the battery pack module 100 for fixation; the battery pack module 100 and the box body 200 can be fixed from the bottom surface or the top surface, and the fixing methods include but are not limited to bolt nuts, buckles, self-tapping screws, etc.

[0054] To facilitate the identification and judgment of whether the battery pack module 100 is installed in place, a flange 108 extends around the top surface of the battery pack housing 101. The flange 108 is used for axially limiting the battery pack module 100. When the lower surface of the flange 108 is in contact with the top surface of the box body 200, the battery pack module 100 is installed in place in the box body 200 and can be fixed by a fixing structure; the existence of the flange 108 can also facilitate the removal of the battery pack module 100 from the box body 200. In addition, the flange 108 also plays a certain role in preventing debris.

[0055] When the battery pack module 100 and the box body 200 are fixed from the bottom surface, as Figures 3-9As shown, fixing posts 109 extending downward are respectively arranged on both sides of the bottom of the battery pack housing 101. A nut 110 is arranged inside the fixing post 109 or a threaded hole is provided. At a position on the bottom surface of the box body 200 corresponding to the fixing post 109, a mounting hole 206 is provided. A bolt 212 passes through the mounting hole 206 and is tightly fitted with the threaded hole or the nut 110 inside the fixing post 109, so as to realize the fixation of the battery pack housing 101 and the box body 200.

[0056] When a threaded hole is arranged inside the fixing post 109, the threaded hole is not communicated with the inside of the battery pack housing 101 to prevent affecting the waterproof sealing effect; when a nut 110 is arranged inside the fixing post 109, the nut 110 is installed into the fixing post 109 through a hot melting or insert structure.

[0057] When the battery pack module 100 and the box body 200 are fixed from the top (not shown in the figure), screws are arranged on the convex edge 108 to be connected with the top surface of the box body 200, so as to realize the fixation between the battery pack module 100 and the box body 200.

[0058] Generally, both the box body 200 and the battery pack housing 101 are axisymmetric structures, and the axis is parallel to the installation direction. When there are node definitions for the positive and negative electrodes of the battery during use, an anti-misassembly structure design is required to avoid misassembling the battery pack module 100. In this embodiment, the anti-misassembly structure adopts the following method: the battery pack housing 101 and the box body 200 are set as non-axisymmetric structures. As Figures 12-13 shown, a rib 111 extending along the installation direction is arranged on one side of the circumference of the battery pack 102 housing 101, and a corresponding guide groove 209 is arranged on the box body 200. Only when the rib 111 on the battery pack housing 101 corresponds to the guide groove 209 of the box body 200 can the installation be carried out, so as to realize anti-misassembly during installation; when there is no definition for the positive and negative electrode nodes of the battery, there is no need for an anti-misassembly structure design.

[0059] Furthermore, as Figures 12-13 shown, a plurality of ribs 208 extending along the installation direction of the battery pack module 100 are arranged on the inner wall of the box body 200. When the battery pack module 100 is installed, the ribs 208 are in clearance fit with the surface of the battery pack 102 housing 101. The line and plane fit is used instead of the plane and plane fit method to reduce the contact area between the battery pack housing 101 and the box body 200, avoid hindering the installation of the battery pack module 100 when the plane is deformed or the plane roughness is relatively high, and thus reduce the tolerance requirements for the flatness and roughness of the battery pack housing 101.

[0060] In occasions where the usage environment requirements are relatively high, when the battery pack 102 is in use, foreign objects should be prevented from entering the box body 200. Therefore, the side walls of the box body 200 are used to completely wrap the module 100 of the battery pack 102. At the same time, the convex edge 108 on the top surface of the battery pack module 100 also plays a role in preventing foreign objects. Of course, in some occasions where the environment requirements are not high, the side walls of the box body 200 can also be used to partially wrap the module 100 of the battery pack 102. For example, Figure 14 As shown, a notch 210 is formed in the side wall of the upper part of the box body 200, presenting an unclosed state, and the module 100 of the battery pack is partially wrapped. At the same time, since the upper part of the battery pack module 100 has been subjected to potting treatment and there is a sealing structure at the bottom, the partial wrapping method will not affect the waterproof sealing performance, and the battery pack module 100 can be disassembled more conveniently.

[0061] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A battery pack installation structure, comprising a box (200) and a battery pack module (100), characterized in that: The battery pack module (100) comprises a battery pack housing (101), a battery pack (102), a circuit board (103) and a battery pack contact (104); the battery pack (102) and the circuit board (103) are mounted in the battery pack housing (101); the battery pack contact (104) is mounted on the bottom surface of the battery pack housing (101); the top surface of the box (200) is open; a contact module (201) corresponding to the battery pack contact (104) is mounted on the bottom of the box (200); the battery pack module (100) is detachably mounted in the box (200) and is sealed by a sealing structure.

2. A battery pack installation structure according to claim 1, characterized in that: After the battery pack (102), the circuit board (103) and the battery pack contact piece (104) are installed in place in the battery pack housing (101), glue is poured into the battery pack housing (101) to fix and seal the components to form the battery pack module (100).

3. A battery pack installation structure according to claim 1, characterized in that: A flange (105) protruding from the bottom outer surface is provided on the bottom outer surface of the battery pack shell (101) and surrounds the area where the battery pack contact (104) is located. A groove (204) adapted to the flange (105) is provided on the bottom surface of the box body (200). The contact module (201) at the bottom of the box body (200) is installed in the area surrounded by the groove (204). The flange (105) and the groove (204) form a stop structure on the periphery of the contact matching area to play a water-blocking role.

4. A battery pack installation structure according to claim 3, characterized in that: A radial sealing ring (106) is provided on the stop structure.

5. A battery pack installation structure according to claim 4, characterized in that: The radial sealing ring (106) is mounted on the outer peripheral surface of the flange (105) and can achieve radial sealing between the flange (105) and the groove (204).

6. A battery pack installation structure according to claim 3, characterized in that: An axial sealing ring (107) is provided inside the stop structure.

7. A battery pack installation structure according to claim 6, characterized in that: The axial sealing ring (107) is arranged on the outer surface of the bottom of the battery pack housing (101) between the inner side of the flange (105) and the outer periphery of the battery pack contact piece (104), and can achieve axial sealing of the contact piece mating area.

8. A battery pack installation structure according to claim 7, characterized in that: The cross section of the axial sealing ring (107) is "H" shaped.

9. A battery pack installation structure according to claim 3, characterized in that: One end of the battery pack contact piece (104) is located inside the battery pack housing (101) and connected to the circuit board (103), and the other end of the battery pack contact piece (104) is located outside the bottom of the battery pack housing (101).

10. A battery pack installation structure according to claim 9, characterized in that: The area on the bottom surface of the battery pack housing (101) where the battery pack contact piece (104) is mounted is bulged outward as a whole to form a space for avoiding the battery pack contact piece (104).

11. A battery pack installation structure according to claim 9, characterized in that: The battery pack contact piece (104) is a plug pin, and the bottom surface of the plug pin is a plane.

12. A battery pack installation structure according to claim 9, characterized in that: The contact piece on the contact piece module (201) is a spring pin (202) or a spring sheet (203); after the battery pack module (100) is installed in place in the box (200), the battery pack contact piece (104) contacts and cooperates with the spring pin (202) or the spring sheet (203) on the box (200).

13. A battery pack installation structure according to claim 12, characterized in that: The spring piece (203) is a double-layer spring piece (203), and the outer spring piece (203) and the inner spring piece (203) are made of different materials.

14. A battery pack installation structure according to claim 12, characterized in that: The lower side of the bottom surface of the box body (200) is recessed at a position corresponding to the contact module (201) to form a mounting groove (207) for accommodating and mounting a box body circuit board, and the contact module (201) is connected to the box body circuit board.

15. A battery pack installation structure according to any one of claims 1 to 14, characterized in that: The bottom of the battery pack shell (101) is provided with downwardly extending fixing columns (109) on both sides respectively, and the bottom surface of the box body (200) is provided with mounting holes (206) at positions corresponding to the fixing columns (109), and bolts (212) pass through the mounting holes (206) and cooperate with the fixing columns (109) to achieve the fixation of the battery pack shell (101) and the box body (200).

16. A battery pack installation structure according to claim 15, characterized in that: A threaded hole is provided in the fixing column (109), the bolt (212) cooperates with the threaded hole, and the threaded hole is not connected to the interior of the battery pack housing (101).

17. A battery pack installation structure according to claim 15, characterized in that: A nut (110) is disposed inside the fixing column (109), and the bolt (212) passes through the mounting hole (206) and cooperates with the nut (110) inside the fixing column (109).

18. A battery pack installation structure according to any one of claims 1 to 14, characterized in that: The top surface of the battery pack shell (101) extends in all directions to form a convex edge (108), the convex edge (108) is used to limit the installation direction of the battery pack module (100), and when the lower surface of the convex edge (108) is in contact with the top surface of the box body (200), the battery pack module (100) is installed in place in the box body (200).

19. A battery pack installation structure according to claim 18, characterized in that: Screws are arranged on the convex edge (108) to connect with the top surface of the box body (200), so as to achieve fixation between the battery pack module (100) and the box body (200).

20. A battery pack installation structure according to any one of claims 1 to 14, characterized in that: An anti-mis-installation structure is provided between the battery pack housing (101) and the box body (200), and the anti-mis-installation structure is realized by an asymmetric structure provided on the battery pack housing (101) and the box body (200).

21. A battery pack installation structure according to claim 20, characterized in that: The asymmetric structure comprises: a convex strip (111) extending along the installation direction and arranged on one side of the battery pack housing (101), and a guide groove (209) corresponding to the convex strip (111) and arranged on the box body (200).

22. A battery pack installation structure according to any one of claims 1 to 14, characterized in that: A convex rib (208) is provided on the inner wall of the box body (200) along the installation direction of the battery pack module (100).

23. A battery pack installation structure according to any one of claims 1 to 14, characterized in that: The side wall of the box body (200) completely or partially wraps the battery pack module (100).

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