Battery pack

Abstract

The utility model discloses a battery pack which comprises a first shell, and the first shell comprises an inner surface and an outer surface; the inner surface of the first shell is connected with the second shell to form a sealing cavity; the third shell is detachably connected with the outer surface of the first shell, and a cavity is defined by the third shell and the outer surface of the first shell; the clamping piece is arranged on the outer surface of the first shell and at least part of the clamping piece is located in the cavity; and the batteries are arranged in the sealing cavity. The first shell is integrated, the first shell and the second shell are encircled to form the sealing cavity, the third shell is connected with the first shell through the clamping piece, a cavity formed by the third shell and the first shell is not communicated with the sealing cavity, latch covers are reduced, assembly is simpler, and meanwhile the risk that water enters the sealing cavity can be greatly reduced through an independent cavity.

Description

Technical Field

[0001] This utility model relates to the field of storage battery technology, and in particular to a battery pack. Background Technology

[0002] With the increasing prominence of environmental protection and energy shortages in modern society, more and more transportation, logistics, and engineering vehicles are adopting energy-saving and clean energy technologies, such as hybrid power, pure electric drive, and fuel cell technology. Among these, secondary batteries, especially lithium-ion batteries, have become the core power source and have been widely used in practice. At the same time, the requirements for the safety and lifespan of lithium-ion batteries are also becoming increasingly stringent.

[0003] In the prior art, to address the problem that battery packs can easily become infiltrated by water through openings in the latching mechanism and terminal access points, leading to battery rust and damage to internal electrical components, thus causing malfunctions, patent (US9553297B2) discloses a battery pack with a housing including an inner cavity, an interface for accommodating a power tool, and a drain hole located at the bottom of the housing; a battery cell located within the cavity; a first latching member extending through the housing; a second latching member extending through the housing, the first and second latching members being operable to secure the battery pack to the power tool; electrical terminals electrically coupled to the battery cell and operable to interface with the power tool; a latch cover supporting the first and second latching members within the inner cavity of the housing, wherein the latch cover is within the housing such that the housing covers the latch cover; and a first drain channel extending along the latch cover and downward along a first space between the battery cell and the housing to the drain hole; wherein the first drain channel guides water that has seeped into the battery pack to the drain hole. The method of setting a latch cover and a drain hole to drain water that enters the inner cavity from the latch component not only increases the number of battery pack components and complicates the assembly, but also poses a risk of water flowing into the PCBA board if the assembly is not done properly. In this regard, this application proposes a battery pack to solve such problems. Summary of the Invention

[0004] Based on this, in order to solve the problems existing in the prior art, this application provides a battery pack, including a first housing, the first housing including an inner surface and an outer surface;

[0005] The second housing is connected to the inner surface of the first housing to form a sealed cavity;

[0006] The third housing is detachably connected to the outer surface of the first housing and together they form a cavity;

[0007] A snap-fit ​​element is mounted on the outer surface of the first housing and is at least partially located within the cavity.

[0008] Several batteries are housed within a sealed cavity.

[0009] Furthermore, an installation groove is provided at the connection between the outer surface of the first housing and the third housing, and the third housing is fitted into the installation groove. The width of the installation groove is slightly greater than the wall thickness of the third housing.

[0010] Furthermore, the surface of the first housing is provided with several wiring holes, and the inner and outer surfaces of the first housing are provided with first flanges around the wiring holes. The inner wall of the third housing is provided with a third flange. The first flange and the third flange abut against each other to form a barrier, isolating the wiring holes from the cavity.

[0011] Furthermore, it also includes a PCBA board, which is disposed in the sealed cavity and located between the mounting bracket and the inner wall of the first housing. The mounting bracket and the first flange located on the inner surface of the first housing cooperate to clamp and fix the PCBA board.

[0012] Furthermore, the end faces of the first flange, the third flange, and the PCBA board that contact each other are provided with a first groove, and a first sealing ring is provided inside the first groove. The first sealing rings partially protrude from the first grooves and abut against the third flange and the PCBA board respectively.

[0013] Furthermore, a terminal is provided on the PCBA board, and a receiving cavity for avoiding the terminal is provided on the inner surface of the first housing. A second flange is provided on the inner surface of the first housing, and the second flange is located on the periphery of the terminal. A second groove is provided at the end of the second flange near the PCBA board, and a second sealing ring is provided in the second groove. The second sealing ring protrudes from the second groove and abuts against the PCBA board.

[0014] Furthermore, it also includes a mounting bracket. The battery is installed in the sealed cavity through the mounting bracket. The mounting bracket includes a first frame and a second frame. The first frame and the second frame are detachably connected. Mounting holes adapted to the shape and size of the battery are opened on the side walls opposite to the first frame and the second frame. The two ends of the battery are snapped into the mounting holes on both sides of the box.

[0015] Furthermore, welding strips are provided at both ends of the battery, and the welding strips fully cover the ends of the battery.

[0016] Furthermore, the inner wall of the second housing is provided with several protrusions, and the outer wall of the mounting bracket is provided with a limiting groove for accommodating the protrusions.

[0017] Furthermore, a bottom cover is fitted onto the bottom of the second housing.

[0018] Beneficial effects: The first housing of this application is integral and can be enclosed with the second housing to form a sealed cavity. The third housing is connected to the first housing by a snap-fit, and the cavity formed with the first housing is not connected to the sealed cavity, which reduces the latch cover and makes assembly simpler. At the same time, the separate chamber can also greatly reduce the risk of water entering the sealed cavity. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the battery pack of this utility model;

[0021] Figure 2 This is a schematic diagram of the first housing structure of the battery pack of this utility model;

[0022] Figure 3 This is a schematic diagram of the third housing structure of the battery pack of this utility model;

[0023] Figure 4 This is a front view of the cross-sectional structure of the battery pack of this utility model;

[0024] Figure 5 This utility model Figure 4 Schematic diagram of the structure at point A in the middle;

[0025] Figure 6 This utility model Figure 4 Schematic diagram of the structure at point B;

[0026] Figure 7 This utility model Figure 4 Schematic diagram of the structure at point C;

[0027] Figure 8 This utility model Figure 4 Schematic diagram of the structure at point D;

[0028] Figure 9 This is a cross-sectional structural diagram of the battery pack of this utility model;

[0029] Figure 10 This is a schematic diagram of the mounting structure of the battery pack of this utility model;

[0030] In the diagram: 1. First housing; 11. Wiring hole; 12. First flange; 13. Mounting groove; 14. First recess; 141. First sealing ring; 15. Second flange; 16. Second recess; 161. Second sealing ring; 2. Second housing; 21. Protrusion; 22. Third recess; 221. Third sealing ring; 3. Bottom cover; 4. Third housing; 41. Snap-fit ​​component; 42. Third flange; 5. Battery; 51. Welding strip; 6. Mounting bracket; 61. First frame; 611. Limiting groove; 62. Second frame; 63. Mounting hole; 7. PCBA board; 71. Terminal.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" throughout the text includes three solutions; taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] like Figures 1-4 As shown, this application embodiment provides a battery pack, including: a first housing 1, the first housing 1 including an inner surface and an outer surface;

[0036] The second housing 2 is connected to the inner surface of the first housing 1 to form a sealed cavity;

[0037] The third housing 4 is detachably connected to the outer surface of the first housing 1 and together they form a cavity.

[0038] The snap-fit ​​component 41 is mounted on the outer surface of the first housing 1 and is at least partially located within the cavity.

[0039] Several batteries 5 are disposed inside a sealed cavity.

[0040] In this embodiment, the first housing 1 and the second housing 2 are connected to form a seal, which can wrap and protect the internal battery 5 and effectively prevent external liquid from entering the sealed cavity. The snap-fit ​​41 extends through the side wall of the third housing 4 to the outside of the cavity. The snap-fit ​​41 is used to connect the third housing 4 and the first housing 1. In addition, the third housing 4 and the first housing 1 can also be detachably connected by bolts. In other embodiments, the surface of the third housing 4 is also provided with a power display device.

[0041] In the prior art, the first part of the outer shell is frame-shaped, which together with the lock cover, the terminal 71 cover and the second part forms an inner cavity. The inside of the lock cover is connected to the inner cavity, which poses a risk of water ingress. To solve this problem, a latch cover is set for drainage and a drain hole is set for drainage. However, due to the large number of parts, the assembly is not only complicated and cumbersome, but if the assembly is not done well, there is still a risk of water entering through the joint seam. In this application, the first shell 1 is integral and can form a sealed cavity by being enclosed with the second shell 2. The third shell 4 is connected to the first shell 1 by a snap-fit ​​41, and the cavity formed with the first shell 1 is not connected to the sealed cavity. This reduces the number of latch covers, making the assembly simpler. At the same time, the separate chamber can greatly reduce the risk of water entering the sealed cavity.

[0042] In one embodiment, a mounting groove 13 is provided at the connection between the outer surface of the first housing 1 and the third housing 4, and the third housing 4 is fitted into the mounting groove 13. The width of the mounting groove 13 is slightly greater than the wall thickness of the third housing 4.

[0043] In this embodiment, the outer wall of the third housing 4 just abuts against the outer wall of the mounting groove 13. By setting the width of the mounting groove 13 to be slightly larger than the wall thickness of the third housing 4, the inner wall of the third housing 4 and the inner side wall of the mounting groove 13 form a drainage channel. When water enters the cavity, it can be drained through the drainage channel.

[0044] like Figures 5-8 As shown, in one embodiment, a plurality of wiring holes 11 are provided on the surface of the first housing 1, and a first flange 12 is provided on the inner and outer surfaces of the first housing 1 around the wiring holes 11. A third flange 42 is provided on the inner wall of the third housing 4. The first flange 12 and the third flange 42 abut against each other to form a barrier, thereby isolating the wiring holes 11 from the cavity.

[0045] In this embodiment, the first flange 12 and the third flange 42 abut against each other after the third housing 4 is connected to the first housing 1, forming a barrier that isolates the wiring hole 11 from the space inside the cavity. With this arrangement, when water enters the cavity, the first flange 12 and the third flange 42 will prevent water from entering the sealed cavity through the wiring hole 11, reducing the risk of water entering the sealed cavity and better protecting components such as the battery 5 and PCBA board 7 inside the sealed cavity.

[0046] In one embodiment, the PCBA board 7 is further included. The PCBA board 7 is disposed in the sealed cavity and is located between the mounting bracket 6 and the inner wall of the first housing 1. The mounting bracket 6 cooperates with the first flange 12 located on the inner surface of the first housing 1 to clamp and fix the PCBA board 7.

[0047] In this embodiment, the PCBA board 7 is positioned between the outer wall of the mounting bracket 6 and the inner wall of the first housing 1, with both the outer wall of the mounting bracket 6 and the first flange 12 abutting against the PCBA board 7, thus clamping and fixing the PCBA board 7. This arrangement facilitates the assembly of the PCBA board 7. The PCBA board 7 is electrically connected to the battery 5, the snap-fit ​​component 41, and the display screen. The PCBA board 7 is positioned within a sealed cavity, which provides protection for the PCBA board 7.

[0048] In one embodiment, the end faces of the first flange 12 that contact the third flange 42 and the PCBA board 7 are each provided with a first groove 14, and a first sealing ring 141 is provided inside the first groove 14. The first sealing ring 141 protrudes partially from the first groove 14 and abuts against the third flange 42 and the PCBA board 7 respectively.

[0049] In this embodiment, the first sealing ring 141 is made of rubber. This design can further improve the sealing performance at the connection between the first flange 12 and the third flange 42 and the PCBA board 7, further reducing the risk of water ingress. In addition, the first sealing ring 141 can also act as a buffer to prevent the first flange 12 from damaging the PCBA board 7.

[0050] In one embodiment, a terminal 71 is provided on the PCBA board 7. A receiving cavity for avoiding the terminal 71 is provided on the inner surface of the first housing 1. A second flange 15 is provided on the inner surface of the first housing 1, and the second flange 15 is located on the periphery of the terminal 71. A second groove 16 is provided at the end of the second flange 15 near the PCBA board 7. A second sealing ring 161 is provided in the second groove 16. The second sealing ring 161 protrudes out of the second groove 16 and abuts against the PCBA board 7. In addition, the second sealing ring 161 can play a buffering role to prevent the second flange 15 from damaging the PCBA board 7.

[0051] In this embodiment, the second sealing ring 161 is made of rubber. This design isolates the receiving cavity from the sealing cavity, preventing water from entering the sealing cavity from the receiving cavity and reducing the risk of water entering the sealing cavity.

[0052] In one embodiment, the second housing 2 has a third groove 22 on the contact surface at the connection with the first housing 1, and a third sealing ring 221 is provided in the third groove 22. The third sealing ring 221 protrudes out of the third groove 22 and abuts against the first housing 1.

[0053] In this embodiment, the second sealing ring 161 is made of rubber. This design improves the sealing performance of the second housing 2 at the connection with the first housing 1, further reducing the risk of water ingress.

[0054] In one embodiment, the inner wall of the second housing 2 is provided with a plurality of protrusions 21, and the outer wall of the mounting bracket 6 is provided with a limiting groove 611 for accommodating the protrusions 21.

[0055] In this embodiment, during assembly, the protrusion 21 at the bottom of the second housing 2 is aligned with the limiting groove 611 of the mounting bracket 6, and the protrusion 21 is inserted into the limiting groove 611. After assembly, the mounting bracket 6 is limited by the protrusion 21 and the limiting groove 611, which can prevent the mounting bracket 6 from moving in the sealed cavity and improve stability.

[0056] In one embodiment, a bottom cover 3 is fitted onto the bottom of the second housing 2.

[0057] In this embodiment, the bottom cover 3 can protect the second housing 2 and prevent the second housing 2 from being damaged by bumps;

[0058] Among them, screw holes are opened at corresponding positions between the first housing 1, the second housing 2 and the bottom cover 3. The first housing 1, the second housing 2 and the bottom cover 3 are detachably connected by bolts, which makes assembly simpler.

[0059] like Figure 9 As shown, in one embodiment, welding strips 51 are provided at both ends of the battery 5, and the welding strips 51 fully cover the ends of both ends of the battery 5.

[0060] In this embodiment, the welding strip 51 is welded to the positive and negative electrodes on both sides of the battery 5 respectively, and the welding strip 51 is electrically connected to the PCBA board 7. In addition, by setting the welding strip 51 to fully cover the ends of the battery 5, the welding strip 51 can protect the electrodes of the battery 5 and prevent the electrodes of the battery 5 from being damaged. With the help of the mounting bracket 6, the battery 5 can be protected in all directions.

[0061] like Figure 10 As shown, in one embodiment, it also includes a mounting bracket 6. The battery 5 is installed in the sealed cavity through the mounting bracket 6. The mounting bracket 6 includes a first frame 61 and a second frame 62. The first frame 61 and the second frame 62 are detachably connected. The side walls of the first frame 61 and the second frame 62 opposite to each other are provided with mounting holes 63 that are adapted to the shape and size of the battery 5. The two ends of the battery 5 are snapped into the mounting holes 63 on both sides of the box.

[0062] In this embodiment, the mounting bracket 6 is box-shaped, the number of mounting holes 63 is the same as the number of batteries 5, and the mounting holes 63 are arranged in an array. The first bracket 61 and the second bracket 62 are detachably connected, which facilitates the installation of batteries 5.

[0063] During installation, the two ends of the battery 5 are snapped into the mounting holes 63 on the side walls of the first frame 61 and the second frame 62, and then the first frame 61 and the second frame 62 are connected by bolts or snap-fit ​​to complete the installation of the battery 5.

[0064] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, include: A first housing, the first housing including an inner surface and an outer surface; The second housing, wherein the inner surface of the first housing is connected to the second housing to form a sealed cavity; The third housing is detachably connected to the outer surface of the first housing and together they form a cavity; A snap-fit ​​element, which is mounted on the outer surface of the first housing and is at least partially located within the cavity; A plurality of batteries, wherein the batteries are disposed within the sealed cavity; The battery is mounted in the sealed cavity via the mounting bracket.

2. The battery pack according to claim 1, characterized in that, An installation groove is provided at the connection between the outer surface of the first housing and the third housing. The third housing is fitted into the installation groove, and the width of the installation groove is slightly greater than the wall thickness of the third housing.

3. The battery pack according to claim 2, characterized in that, The first housing has a plurality of wiring holes on its surface. The inner and outer surfaces of the first housing are provided with a first flange around the wiring holes. The inner wall of the third housing is provided with a third flange. The first flange and the third flange abut against each other to form a barrier, isolating the wiring holes from the cavity.

4. The battery pack according to claim 3, characterized in that, It also includes a PCBA board, which is disposed in the sealed cavity and located between the mounting bracket and the inner wall of the first housing. The mounting bracket cooperates with the first flange located on the inner surface of the first housing to clamp and fix the PCBA board.

5. The battery pack according to claim 4, characterized in that, The end faces of the first flange that contact the third flange and the PCBA board are each provided with a first groove. A first sealing ring is provided inside the first groove, and the first sealing ring partially protrudes from the first groove. The first sealing ring abuts against the third flange and the PCBA board respectively.

6. The battery pack according to claim 4, characterized in that, A terminal is provided on the PCBA board. The inner surface of the first housing is provided with a receiving cavity to avoid the terminal. A second flange is provided on the inner surface of the first housing and the second flange is located on the periphery of the terminal. A second groove is provided at the end of the second flange near the PCBA board. A second sealing ring is provided in the second groove. The second sealing ring protrudes from the second groove and abuts against the PCBA board.

7. The battery pack according to claim 1, characterized in that, The mounting bracket includes a first frame and a second frame. The first frame and the second frame are detachably connected. The side walls of the first frame and the second frame opposite to each other are provided with mounting holes adapted to the shape and size of the battery. Both ends of the battery are snapped into the mounting holes.

8. The battery pack according to claim 1, characterized in that, Both ends of the battery are provided with welding strips, which fully cover the ends of the battery.

9. The battery pack according to claim 7, characterized in that, The inner wall of the second housing is provided with a plurality of protrusions, and the outer wall of the mounting bracket is provided with a limiting groove for accommodating the protrusions.

10. The battery pack according to claim 1, characterized in that, The bottom of the second housing is fitted with a bottom cover.

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