Stripping-resistant and shearing-resistant battery pack shell structure

Abstract

The utility model relates to the technical field of batteries, in particular to a stripping-resistant and shearing-resistant battery pack shell structure which comprises a lower cover and an upper cover, a wire outlet hole is formed in the upper cover, and the upper cover and the lower cover are connected in an inserted mode and bonded through glue. The upper cover comprises an inserting part and a top sealing part, and the inserting part is connected with the lower cover in an inserting manner; the inserting part comprises two first glue containing grooves, a sealing ring is arranged between the two first glue containing grooves, the two first glue containing grooves are coated with structural glue and sealing glue respectively, a plurality of glue overflowing holes are formed in the two first glue containing grooves at intervals, the structural glue and the sealing glue are coated through the two first glue containing grooves respectively, and the sealing ring is arranged between the two first glue containing grooves. When the structural adhesive layer is thin, the shearing resistance is high, but the stripping resistance is poor, when the sealant layer is thick, the stripping resistance is good, in order to achieve the good shearing resistance, two kinds of glue with different properties are used at the same time, and the requirements of stripping resistance and shearing resistance after shell glue joint are met.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack shell structure that is resistant to peeling and shearing. Background Art

[0002] Thanks to the development of the industry, the development of my country's drone industry has entered the fast lane in recent years. As the energy source of drones, drone power battery packs (hereinafter referred to as "battery packs") play an important role in the drone industry. At present, battery packs with high specific energy, wide temperature, strong weather resistance and high safety have become the goal pursued by the industry. The main purpose is to improve the mission completion capability and cruising range of drones. The higher the weight of the battery pack in the drone, the greater the cruising range of the drone. When the energy density of the single battery and the weight of the drone that can be decomposed into the battery pack are certain, the lightweight design of the battery pack structure is an important way to improve the weight energy density of the battery pack.

[0003] The battery pack shells for existing drones are usually heat shrink tubing sealing structures, and the sealing is increased by applying sealant. For example, Chinese Patent Publication No. CN219801103U discloses "a sealing structure for a battery module", which includes: a shell having an outlet terminal and a sealing end that are opposite to each other, and the outlet terminal is provided with an outlet port; a heat shrink film, which is coated on the outside of the shell, and the two ends of the heat shrink film have a first opening and a second opening respectively; a first gasket, which is arranged at one end of the heat shrink film and covers the second opening; a second gasket, which is arranged at the end of the heat shrink film away from the first gasket, and the second gasket is provided with a third opening, and the third opening, the first opening and the outlet port are connected. In the utility model, a first gasket and a second gasket are respectively added at both ends of the heat shrink film, replacing the original solution of applying a large amount of sealant on the ends, thereby solving the problem that the battery module is not formed regularly due to filling with a large amount of sealant, thereby affecting its installation;

[0004] However, in actual use, the heat shrink film in the sealing structure is prone to aging after long-term use, and the heat shrink film itself has poor wear resistance and is easily damaged, which cannot meet the requirements of mechanical equipment such as drones used in harsh environments. Utility Model Content

[0005] The purpose of the utility model is to solve the problems in the prior art that the heat shrink film is easily aged and damaged after long-term use, and cannot meet the needs of mechanical equipment such as drones in harsh environments, and to propose a battery pack shell structure that is resistant to peeling and shearing.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] Design a peeling and shearing resistant battery pack housing structure, comprising a lower cover and an upper cover, wherein the upper cover is provided with a wire outlet hole, and the upper cover is plugged with the lower cover and bonded by glue;

[0008] The upper cover comprises: a glue containing part and a sealing top part, the wire outlet hole is opened on the sealing top part, and the glue containing part is plugged into the lower cover;

[0009] The glue containing part includes two first glue containing grooves, a sealing ring is arranged between the two first glue containing grooves, the two first glue containing grooves are respectively coated with structural glue and sealant, and a plurality of glue overflow holes are arranged at intervals on the two first glue containing grooves.

[0010] Furthermore, an anti-overflow glue component is provided on the sealing top, and the anti-overflow glue component is in contact with the top of the lower cover.

[0011] Furthermore, the anti-overflow glue component includes a second glue containing groove opened on the top cover, and the second glue containing groove is an annular structure.

[0012] Furthermore, the anti-overflow glue component also includes an anti-overflow ring, and the upper end of the anti-overflow ring is movably plugged into the second glue containing groove.

[0013] Furthermore, a slot is provided in the second glue containing groove, and the upper end of the anti-overflow ring is movably plugged into the slot.

[0014] Furthermore, a connecting piece is fixedly connected to the top of the slot, and a lower end of the connecting piece is fixedly connected to the anti-overflow ring.

[0015] Furthermore, the connecting piece is an elastic piece, which can be deformed when the anti-overflow ring moves upward, thereby releasing space for the anti-overflow ring to move upward.

[0016] Furthermore, a flow-blocking ring is fixedly provided on the inner wall of the anti-overflow ring, and the flow-blocking ring is provided at the lower end portion of the anti-overflow ring.

[0017] Furthermore, a sealing ring is fixedly connected to the bottom of the glue containing portion, and a glue blocking surface is provided at the upper end of the sealing ring.

[0018] Furthermore, a plurality of glue overflow grooves are spaced apart from each other on the first glue containing groove.

[0019] The utility model provides a battery pack housing structure that is resistant to peeling and shearing, and has the following beneficial effects:

[0020] In the utility model, two first glue containing grooves are provided on the glue containing part, and the structural glue and the sealant are applied respectively. When the structural glue layer is thin, its shear resistance is strong, but its peeling resistance is poor. When the sealant is thick, its peeling resistance is better. In order to have better shear resistance, two glues of different properties are used at the same time, so that the shell has the characteristics of both peeling resistance and shear resistance after glue bonding, and at the same time, the lightweight design is met;

[0021] Secondly, in the utility model, a sealing ring is used to avoid the reduction of the glue bonding force caused by the mixing of the two components of sealant and structural glue. The overflow hole can form an inverted structure after the glue is cured, so that the bonding performance of the glue is further improved. At the same time, the overflow hole can reduce the gluing accuracy of the production process, avoid excessive glue overflowing the outer surface of the battery pack shell, and further avoid excessive glue overflow by providing an anti-overflow glue component. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a battery pack housing structure that is resistant to peeling and shearing proposed by the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the first glue containing tank of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the sealing ring of the utility model;

[0025] Figure 4 This is an enlarged structural diagram of the A area of ​​the utility model;

[0026] Figure 5 It is a structural schematic diagram of the connecting piece of the utility model.

[0027] In the figure: 1. lower cover; 2. upper cover; 3. wire outlet hole; 4. glue containing part; 41. first glue containing groove; 42. glue overflow hole; 5. sealing top; 6. sealing ring; 7. anti-glue overflow component; 71. second glue containing groove; 72. anti-glue overflow ring; 73. slot; 74. connector; 75. blocking ring; 8. sealing ring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] Reference Figure 1-5A battery pack shell structure that is resistant to peeling and shearing includes a lower cover 1 and an upper cover 2. The upper cover 2 is made of engineering plastics and a Kevlar composite material. The shell wall thickness can be as thin as 0.2 mm to 0.4 mm. A wire outlet hole 3 is provided on the upper cover 2. The upper cover 2 is plugged into the lower cover 1 and bonded by glue.

[0030] The upper cover 2 includes: a glue containing part 4 and a sealing top part 5, the wire outlet hole 3 is opened on the sealing top part 5, and the glue containing part 4 is plugged into the lower cover 1;

[0031] The glue containing part 4 includes two first glue containing grooves 41, a sealing ring 6 is arranged between the two first glue containing grooves 41, the two first glue containing grooves 41 are respectively coated with structural glue and sealant, a plurality of glue overflow holes 42 are arranged at intervals on the two first glue containing grooves 41, and the sealing ring 6 is made of silicone rubber.

[0032] In the present invention, two first glue containing grooves 41 are provided on the glue containing part 4, and the structural glue and the sealant are applied respectively. When the structural glue layer is thin, its shear resistance is strong, but its peeling resistance is poor. When the sealant is thick, its peeling resistance is good. In order to have good shear resistance, two glues of different properties are used at the same time, so that the shell has the characteristics of both peeling resistance and shear resistance after glue bonding, and at the same time, the lightweight design is met.

[0033] In this embodiment, the first glue groove 41 of the sealant is located at the top, and the reserved glue layer thickness is relatively thick, more than 0.8 mm, which can meet the peeling strength of the joint area between the upper cover 2 and the lower cover 1. The first glue groove 41 of the structural glue is located at the bottom, and the reserved glue layer thickness is relatively thin, which can meet the shear resistance of the shell joint area. The characteristics of the sealant: when the glue is thick, its peeling resistance is better. In order to have better shear resistance, the width of the glue coating should be relatively large. All glue bonding is done with sealant, which is not conducive to the lightweight design of the shell.

[0034] Furthermore, in this embodiment, an anti-overflow glue component 7 is provided on the top cover 5, and the anti-overflow glue component 7 is in contact with the top of the lower cover 1. By providing the anti-overflow glue component, excessive glue is prevented from overflowing the outer surface of the battery pack shell, thereby reducing the gluing accuracy of the production process.

[0035] In this embodiment, the anti-overflow glue component 7 includes a second glue containing groove 71 opened on the sealing top portion 5. The second glue containing groove 71 is an annular structure for accommodating glue overflowed when the glue containing portion 4 is plugged into the lower cover 1 to prevent the glue from overflowing the outer surface of the battery pack shell.

[0036] Furthermore, in the present embodiment, the anti-overflow glue assembly 7 also includes an anti-overflow ring 72 , the upper end of which is movably connected to the second glue containing groove 71 , so as to guide the glue liquid overflowing from the glue containing part 4 when being connected to the lower cover 1 into the second glue containing groove 71 .

[0037] In this embodiment, a slot 73 is provided in the second glue containing groove 71, and the upper end of the anti-overflow ring 72 is movably plugged into the slot 73 to accommodate the anti-overflow ring 72 so that the anti-overflow ring 72 will not hinder the plugging of the upper cover 2 and the lower cover 1.

[0038] It should be noted that, in this embodiment, a connecting piece 74 is fixedly connected to the top of the slot 73, and the lower end of the connecting piece 74 is fixedly connected to the anti-overflow ring 72. The anti-overflow ring 72 is limited by the connecting piece 74 to prevent it from being separated and misaligned from the slot 73.

[0039] In this embodiment, the connecting member 74 is an elastic member with weak elasticity. When the anti-overflow ring 72 moves upward, it can be deformed to release space for the anti-overflow ring 72 to move upward, and will not hinder the insertion of the upper cover 2 and the lower cover 1.

[0040] Furthermore, in some embodiments, a baffle ring 75 is fixedly provided on the inner wall of the anti-overflow ring 72, and the baffle ring 75 is arranged at the lower end portion of the anti-overflow ring 72. The glue in the second glue containing groove 71 cooperates with the anti-overflow ring 72 and the baffle ring 75 to form an L-shaped structure after solidification, thereby increasing the sealing performance.

[0041] In detail, in some embodiments, a sealing ring 8 is fixedly connected to the bottom of the glue containing portion 4 , and a glue blocking surface is provided at the upper end of the sealing ring 8 to prevent the structural glue from flowing down into the lower cover 1 and avoid adverse effects on the parts in the lower cover 1 .

[0042] In some embodiments, a plurality of glue overflow grooves are spaced apart on the first glue containing groove 41 , similar to the glue overflow hole 42 , so that an undercut structure can be formed after the glue is cured, thereby further improving the bonding performance of the glue.

[0043] Working method: During installation, first install the sealing ring 6 between the two first glue grooves 41, then glue the two first glue grooves 41, and insert the glue container 4 into the lower cover 1. During this process, excess glue will flow into the overflow hole 42 or the second glue groove 71 to prevent excessive glue from overflowing the outer surface of the battery pack shell and causing adverse effects;

[0044] When installing the upper cover 2, the lower end of the anti-overflow ring 72 contacts the lower cover 1, and the glue overflowing from the glue containing part 4 when plugging with the lower cover 1 is guided into the second glue containing groove 71. As the plugging proceeds, the connecting piece 74 is deformed to release space for the anti-overflow ring 72 to move upward, which will not hinder the plugging of the upper cover 2 and the lower cover 1.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery pack housing structure that is resistant to peeling and shearing, comprising a lower cover (1) and an upper cover (2), characterized in that: The upper cover (2) is plugged into the lower cover (1) and bonded together by glue; The upper cover (2) comprises: a glue containing portion (4) and a sealing top portion (5), and the glue containing portion (4) is plugged into the lower cover (1); The glue containing portion (4) comprises two first glue containing grooves (41), a sealing ring (6) is arranged between the two first glue containing grooves (41), the two first glue containing grooves (41) are respectively coated with structural glue and sealing glue, and a plurality of glue overflow holes (42) are arranged at intervals on the two first glue containing grooves (41).

2. The peeling and shearing resistant battery pack housing structure according to claim 1, characterized in that: The sealing top portion (5) is provided with an anti-overflow glue component (7), and the anti-overflow glue component (7) is in contact with the top of the lower cover (1).

3. The peeling and shearing resistant battery pack housing structure according to claim 2, characterized in that: The anti-overflow glue component (7) comprises a second glue containing groove (71) opened on the sealing top portion (5), and the second glue containing groove (71) is an annular structure.

4. The peeling and shearing resistant battery pack housing structure according to claim 3, characterized in that: The anti-overflow glue assembly (7) further comprises an anti-overflow ring (72), the upper end of the anti-overflow ring (72) being movably plugged into the second glue containing groove (71).

5. The peeling and shearing resistant battery pack housing structure according to claim 4, characterized in that: A slot (73) is provided in the second glue containing groove (71), and the upper end of the anti-overflow ring (72) is movably plugged into the slot (73).

6. The peeling and shearing resistant battery pack housing structure according to claim 5, characterized in that: A connecting piece (74) is fixedly connected to the top of the slot (73), and a lower end of the connecting piece (74) is fixedly connected to the anti-overflow ring (72).

7. The peeling and shearing resistant battery pack housing structure according to claim 6, characterized in that: The connecting piece (74) is an elastic piece, which can be deformed when the anti-overflow ring (72) moves upward, thereby releasing space for the anti-overflow ring (72) to move upward.

8. The peeling and shearing resistant battery pack housing structure according to claim 4, characterized in that: A flow-blocking ring (75) is fixedly provided on the inner wall of the overflow prevention ring (72), and the flow-blocking ring (75) is provided at the lower end portion of the overflow prevention ring (72).

9. The peeling and shearing resistant battery pack housing structure according to claim 1, characterized in that: A sealing ring (8) is fixedly connected to the bottom of the glue containing portion (4), and a glue blocking surface is provided at the upper end of the sealing ring (8).

10. The peeling and shearing resistant battery pack housing structure according to claim 1, characterized in that: A plurality of glue overflow grooves are spaced apart on the first glue containing groove (41), and a wire outlet hole (3) is provided on the upper cover (2).

Images