Sealing structure of battery pack

Abstract

The utility model discloses a sealing structure of a battery pack, which comprises a lower shell, a sealing ring and an upper shell, the lower shell comprises a bottom plate, and the upper end face of the bottom plate is provided with a baffle and a convex edge which are distributed left and right; the upper shell comprises a top plate, two upper side plates, a first pressing plate and a second pressing plate are arranged on the lower end face of the top plate, the two upper side plates are distributed front and back, the left sides of the two upper side plates are connected through the first pressing plate, and the right sides of the two upper side plates are connected through the second pressing plate; the front side face of the bottom plate and the rear side face of one upper side plate, the left side face of the baffle and the right side face of the first pressing plate, the rear side face of the bottom plate and the front side face of the other upper side plate, and the upper end face of the convex edge and the lower end face of the second pressing plate are matched to press the sealing ring. The method has the advantage that the volume energy density of the battery pack can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of soft-pack batteries, and particularly relates to a sealing structure of a battery pack. Background Art

[0002] A battery pack is a system composed of multiple battery modules and related components, and is usually used in applications such as electric vehicles, power tools, and renewable energy energy storage systems. Its main function is to provide electrical energy and ensure the safe and efficient operation of the battery.

[0003] For example, a battery pack disclosed in the patent application No. CN201610672080.4 includes: a box cover, a box body, and a sealing strip; a first mounting surface is provided on the periphery of the open end of the box body, and a plurality of limit nuts are provided on the first mounting surface; a first through hole corresponding to the position of the limit nut is provided on the sealing strip, and each first through hole is sleeved on the limit nut; a second mounting surface is provided on the periphery of the open end of the box cover, and a plurality of second through holes corresponding to the position of the limit nut are provided on the second mounting surface, and the box cover covers the box body, and screws are inserted into the second through holes and the limit nuts.

[0004] In this technical solution, the first mounting surface and the second mounting surface cooperate to compress the sealing ring to achieve a good waterproof and dustproof effect. However, their sealing surfaces are all on the same plane. In order to ensure the sealing effect, the width of the sealing ring is relatively wide, which will occupy more X-direction and Y-direction spaces of the battery pack and affect the volume energy density of the battery pack. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a sealing structure of a battery pack, which helps to improve the volume energy density of the battery pack.

[0006] The technical solution adopted by the utility model to solve the above technical problem is: a sealing structure of a battery pack, including a lower housing, a sealing ring, and an upper housing. The lower housing includes a bottom plate, and baffles and convex edges are arranged on the upper end surface of the bottom plate in a left-right distribution; the upper housing includes a top plate, and two upper side plates, a first pressing plate, and a second pressing plate are arranged on the lower end surface of the top plate. The two upper side plates are distributed front and back, the left sides of the two upper side plates are connected by the first pressing plate, and the right sides of the two upper side plates are connected by the second pressing plate; the front side surface of the bottom plate and the rear side surface of one upper side plate, the left side surface of the baffle and the right side surface of the first pressing plate, the rear side surface of the bottom plate and the front side surface of the other upper side plate, and the upper end surface of the convex edge and the lower end surface of the second pressing plate cooperate to compress the sealing ring.

[0007] Preferably, the sealing ring includes a first sealing strip, a second sealing strip, a third sealing strip, and a fourth sealing strip. The first sealing strip, the second sealing strip, the third sealing strip, and the fourth sealing strip are sequentially connected to form a frame shape. The front side of the lower housing and the rear side of one of the upper side plates cooperate to press the first sealing strip. The left side of the baffle and the right side of the first pressing plate cooperate to press the second sealing strip. The rear side of the lower housing and the front side of the other upper side plate cooperate to press the third sealing strip. The upper end surface of the convex edge and the lower end surface of the second pressing plate cooperate to press the fourth sealing strip.

[0008] Preferably, the first pressing plate is in a U shape with an opening facing downwards, and the second sealing strip is in a U shape adapted to the first pressing plate.

[0009] Preferably, two lower side plates are arranged on the upper end surface of the bottom plate in a front-to-back distribution. The left sides of the two lower side plates are connected by the baffle, and the right sides of the two lower side plates are connected by the convex edge.

[0010] Preferably, the left side of the lower side plate is connected to the baffle through a bending part, and the left side of the upper side plate is connected to the first pressing plate through a third pressing plate. The two third pressing plates correspond to the two bending parts one by one.

[0011] Preferably, the bending part includes a first folded edge and a second folded edge. One end of the first folded edge is fixedly connected to the left side of the lower side plate, the other end of the first folded edge is fixedly connected to one end of the second folded edge, the second folded edge covers the left side surface of the baffle, and the two third pressing plates correspond to the two first folded edges one by one.

[0012] Preferably, connection parts are respectively arranged between the left side of the first sealing strip and the second sealing strip, and between the left side of the third sealing strip and the second sealing strip. The two connection parts correspond to the two bending parts one by one.

[0013] Preferably, the connection part includes a fifth sealing strip and a sixth sealing strip. The lower end of one fifth sealing strip is connected to the left end of the first sealing strip, the lower end of the other fifth sealing strip is connected to the left end of the third sealing strip. The two fifth sealing strips correspond to the two lower side plates one by one and cover the side surfaces of the corresponding lower side plates. The right side of the sixth sealing strip is connected to the upper end of the fifth sealing strip. The sixth sealing strip covers the side surface of the first folded edge. The left sides of the two sixth sealing strips are connected to the two ends of the second sealing strip one by one, and the end part of the second sealing strip covers the side surface of the second folded edge.

[0014] Preferably, the included angle between the lower side plate and the first folded edge is 120° - 150°, and the included angle between the first folded edge and the second folded edge is 120° - 150°.

[0015] Preferably, inclined guide surfaces are respectively arranged on the front and rear sides of the upper end surface of the convex edge, and the fourth sealing strip covers the upper end surface of the convex edge and the two inclined guide surfaces.

[0016] Compared with the prior art, the advantages of the present utility model are as follows: By optimizing the structural design, the partial sealing strips between the front side surface of the bottom plate and the rear side surface of an upper side plate, between the left side surface of the baffle and the right side surface of the first pressing plate, and between the rear side surface of the bottom plate and the front side surface of the other upper side plate are in a vertical state, that is, the sealing strips in this part extend along the Z direction. Compared with the conventional structural design, it can greatly reduce the occupation of the X-direction space and the Y-direction space, the structural design is more compact, and it helps to improve the volume energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded structural schematic diagram of the present utility model Figure 1 ;

[0018] Figure 2 is an exploded structural schematic diagram of the present utility model Figure 2 ;

[0019] Figure 3 is a partial structural schematic diagram of the present utility model Figure 1 ;

[0020] Figure 4 is a partial structural schematic diagram of the present utility model Figure 2 ;

[0021] Figure 5 is a partial structural schematic diagram of the present utility model Figure 3 ;

[0022] Figure 6 is a partial structural schematic diagram of the present utility model Figure 4 .

[0023] In the figure: 1. Lower housing; 11. Bottom plate; 12. Baffle; 13. Convex edge; 131. Inclined guide surface; 14. Lower side plate; 15. Bending part; 151. First folded edge; 152. Second folded edge; 2. Sealing ring; 21. First sealing strip; 22. Second sealing strip; 23. Third sealing strip; 24. Fourth sealing strip; 25. Connecting part; 251. Fifth sealing strip; 252. Sixth sealing strip; 3. Upper housing; 31. Top plate; 32. Upper side plate; 33. First pressing plate; 34. Second pressing plate; 35. Third pressing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following further describes the present utility model in detail with reference to the embodiments and the accompanying drawings.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] Embodiment 1: As shown in Figure 1 and Figure 2 , a sealing structure of a battery pack includes a lower housing 1, a sealing ring 2, and an upper housing 3. The lower housing 1 includes a bottom plate 11, and a baffle 12 and a convex edge 13 are arranged on the upper end surface of the bottom plate 11 in a left-right distribution; the upper housing 3 includes a top plate 31, and two upper side plates 32, a first pressing plate 33, and a second pressing plate 34 are arranged on the lower end surface of the top plate 31. The two upper side plates 32 are distributed front and back, the left sides of the two upper side plates 32 are connected by the first pressing plate 33, and the right sides of the two upper side plates 32 are connected by the second pressing plate 34; the front side surface of the bottom plate 11 is in cooperation with the rear side surface of one upper side plate 32, the left side surface of the baffle 12 is in cooperation with the right side surface of the first pressing plate 33, the rear side surface of the bottom plate 11 is in cooperation with the front side surface of the other upper side plate 32, and the upper end surface of the convex edge 13 is in cooperation with the lower end surface of the second pressing plate 34 to tightly press the sealing ring 2.

[0027] In this embodiment, the sealing ring 2 includes a first sealing strip 21, a second sealing strip 22, a third sealing strip 23, and a fourth sealing strip 24. The first sealing strip 21, the second sealing strip 22, the third sealing strip 23, and the fourth sealing strip 24 are connected in sequence to form a frame shape. The front side surface of the lower housing 1 is in cooperation with the rear side surface of one upper side plate 32 to tightly press the first sealing strip 21, the left side surface of the baffle 12 is in cooperation with the right side surface of the first pressing plate 33 to tightly press the second sealing strip 22, the rear side surface of the lower housing 1 is in cooperation with the front side surface of the other upper side plate 32 to tightly press the third sealing strip 23, and the upper end surface of the convex edge 13 is in cooperation with the lower end surface of the second pressing plate 34 to tightly press the fourth sealing strip 24.

[0028] In this solution, the first sealing strip 21, the second sealing strip 22, and the third sealing strip 23 are in a vertical state, that is, this part of the sealing strip extends along the Z direction. Compared with the conventional structural design, it can greatly reduce the occupation of the X-direction space and the Y-direction space, and the structural design is more compact, which helps to improve the volume energy density of the battery pack.

[0029] Embodiment 2: As shown in Figures 1 to 4As shown, the rest is the same as in the first embodiment, except that the first pressing plate 33 is in a U-shaped form with the opening facing downwards, and the second sealing strip 22 is in a U-shaped form adapted to the first pressing plate 33.

[0030] In this embodiment, two lower side plates 14 arranged front and back are provided on the upper end surface of the bottom plate 11. The left sides of the two lower side plates 14 are connected by a baffle 12, and the right sides of the two lower side plates 14 are connected by a convex edge 13.

[0031] In this embodiment, the left side of the lower side plate 14 is connected to the baffle 12 through a bending part 15, and the left side of the upper side plate 32 is connected to the first pressing plate 33 through a third pressing plate 35. The two third pressing plates 35 correspond to the two bending parts 15 one by one.

[0032] Embodiment Three: As Figures 1 to 4 shown, the rest is the same as in the second embodiment, except that the bending part 15 includes a first folding edge 151 and a second folding edge 152. One end of the first folding edge 151 is fixedly connected to the left side of the lower side plate 14, the other end of the first folding edge 151 is fixedly connected to one end of the second folding edge 152, the second folding edge 152 covers the left side surface of the baffle 12, the two third pressing plates 35 correspond to the two first folding edges 151 one by one, and the third pressing plate 35 presses on the outer side surface of the corresponding first folding edge 151.

[0033] In this embodiment, connection parts 25 are respectively provided between the left side of the first sealing strip 21 and the second sealing strip 22, and between the left side of the third sealing strip 23 and the second sealing strip 22. The two connection parts 25 correspond to the two bending parts 15 one by one. Specifically, the connection part 25 includes a fifth sealing strip 251 and a sixth sealing strip 252. The lower end of one fifth sealing strip 251 is connected to the left end of the first sealing strip 21, the lower end of the other fifth sealing strip 251 is connected to the left end of the third sealing strip 23. The two fifth sealing strips 251 correspond to the two lower side plates 14 one by one and cover the side surfaces of the corresponding lower side plates 14. The right side of the sixth sealing strip 252 is connected to the upper end of the fifth sealing strip 251. The sixth sealing strip 252 covers the side surface of the first folding edge 151. The left sides of the two sixth sealing strips 252 correspond to and are connected to the two ends of the second sealing strip 22. The end part of the second sealing strip 22 covers the side surface of the second folding edge 152.

[0034] Embodiment Four: As Figures 3 to 6 shown, the rest is the same as in the third embodiment, except that the included angle between the lower side plate 14 and the first folding edge 151 is 120° - 150°, preferably 135°, and the included angle between the first folding edge 151 and the second folding edge 152 is 120° - 150°, preferably 135°.

[0035] In this embodiment, inclined guide surfaces 131 are respectively arranged on the front and rear sides of the upper end surface of the convex edge 13, and the fourth sealing strip 24 covers the upper end surface of the convex edge 13 and the two inclined guide surfaces 131. Preferably, the included angle between the inclined guide surface 131 and the upper end surface of the convex edge 131 is 135°. During the process of covering the upper housing 3 onto the lower housing 1, the acting force on the fourth sealing strip 24 can be reduced, so as to reduce the risk of wear of the fourth sealing strip 24 and ensure the product quality.

[0036] The above has described the present utility model in an exemplary manner with reference to the accompanying drawings. Obviously, the implementation of the present utility model is not limited by the above-mentioned manner. As long as various improvements are made by adopting the method concept and technical solution of the present utility model, or the concept and technical solution of the present utility model are directly applied to other occasions without improvement, they are all within the protection scope of the present utility model.

Claims

1. A sealing structure of a battery pack, comprising a lower shell (1), a sealing ring (2) and an upper shell (3), characterized in that The lower housing (1) comprises a bottom plate (11), and a baffle (12) and a convex edge (13) are arranged on the upper end surface of the bottom plate (11) and are distributed on the left and right sides; The upper shell (3) comprises a top plate (31), and two upper side plates (32), a first pressing plate (33) and a second pressing plate (34) are arranged on the lower end surface of the top plate (31), the two upper side plates (32) are distributed front to back, the left sides of the two upper side plates (32) are connected via the first pressing plate (33), and the right sides of the two upper side plates (32) are connected via the second pressing plate (34); The front side surface of the bottom plate (11) and the rear side surface of one of the upper side plates (32), the left side surface of the baffle plate (12) and the right side surface of the first pressure plate (33), the rear side surface of the bottom plate (11) and the front side surface of another of the upper side plates (32), the upper end surface of the flange (13) and the lower end surface of the second pressure plate (34) cooperate to press the sealing ring (2).

2. A sealing structure for a battery pack according to claim 1, characterized in that The sealing ring (2) comprises a first sealing strip (21), a second sealing strip (22), a third sealing strip (23) and a fourth sealing strip (24); the first sealing strip (21), the second sealing strip (22), the third sealing strip (23) and the fourth sealing strip (24) are connected in sequence and form a frame; the front side surface of the lower shell (1) cooperates with the rear side surface of one of the upper side plates (32) to press the first sealing strip (21); the left side surface of the baffle (12) cooperates with the right side surface of the first pressure plate (33) to press the second sealing strip (22); the rear side surface of the lower shell (1) cooperates with the front side surface of another of the upper side plates (32) to press the third sealing strip (23); the upper end surface of the flange (13) cooperates with the lower end surface of the second pressure plate (34) to press the fourth sealing strip (24).

3. A sealing structure for a battery pack according to claim 2, characterized in that The first pressing plate (33) is in a U-shape with its opening facing downward, and the second sealing strip (22) is in a U-shape matching the first pressing plate (33).

4. The sealing structure of a battery pack according to claim 2, characterized in that Two lower side plates (14) are arranged on the upper end surface of the bottom plate (11) and are distributed front to back. The left sides of the two lower side plates (14) are connected via the baffle (12), and the right sides of the two lower side plates (14) are connected via the convex edge (13).

5. A sealing structure for a battery pack according to claim 4, characterized in that The left side of the lower side plate (14) is connected to the baffle (12) via a bent portion (15), and the left side of the upper side plate (32) is connected to the first pressing plate (33) via a third pressing plate (35), and the two third pressing plates (35) correspond one to one to the two bent portions (15).

6. A sealing structure for a battery pack according to claim 5, characterized in that The bending portion (15) comprises a first folded edge (151) and a second folded edge (152), one end of the first folded edge (151) is fixedly connected to the left side of the lower side plate (14), the other end of the first folded edge (151) is fixedly connected to one end of the second folded edge (152), the second folded edge (152) covers the left side surface of the baffle (12), and the two third pressure plates (35) correspond one to one to the two first folded edges (151).

7. A sealing structure for a battery pack according to claim 6, characterized in that Connecting portions (25) are respectively provided between the left side of the first sealing strip (21) and the second sealing strip (22), and between the left side of the third sealing strip (23) and the second sealing strip (22), and the two connecting portions (25) correspond one to one to the two bending portions (15).

8. The sealing structure of a battery pack according to claim 7, characterized in that The connecting portion (25) comprises a fifth sealing strip (251) and a sixth sealing strip (252), wherein the lower end of one of the fifth sealing strips (251) is connected to the left end of the first sealing strip (21), and the lower end of the other fifth sealing strip (251) is connected to the left end of the third sealing strip (23), the two fifth sealing strips (251) correspond one-to-one to the two lower side panels (14) and cover the corresponding side surfaces of the lower side panels (14), the right side of the sixth sealing strip (252) is connected to the upper end of the fifth sealing strip (251), and the sixth sealing strip (252) covers the side surface of the first folding edge (151), the left sides of the two sixth sealing strips (252) correspond one-to-one to and are connected to the two ends of the second sealing strip (22), and the end of the second sealing strip (22) covers the side surface of the second folding edge (152).

9. The sealing structure of a battery pack according to claim 6, characterized in that The included angle between the lower side plate (14) and the first folded edge (151) is 120°-150°, and the included angle between the first folded edge (151) and the second folded edge (152) is 120°-150°.

10. The sealing structure of a battery pack according to claim 2, characterized in that Inclined guide surfaces (131) are respectively provided on the front and rear sides of the upper end surface of the convex edge (13), and the fourth sealing strip (24) covers the upper end surface of the convex edge (13) and the two inclined guide surfaces (131).

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