Upper shell of battery pack and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses an upper shell of a battery pack and the battery pack. The upper shell of the battery pack is of an integrated punch forming structure and comprises a shell body, a first flange edge and a plurality of convex ribs. The first flange edge is arranged on the periphery of the edge of the shell body, the first flange edge is used for being connected with a lower shell of the battery pack, a plurality of first assembly holes are formed in the first flange edge, and the first assembly holes are formed around the periphery of the shell body at intervals; the first flange edge comprises a first surface used for being in butt joint with the lower shell and a second surface deviating from the lower shell. The convex ribs are arranged on the first surface and / or the second surface of the first flange edge. According to the upper shell of the battery pack provided by the invention, the overall structural strength of the upper shell can be improved, the compaction effect between the first surface of the first flange edge of the upper shell and the sealing surface of the second flange edge of the lower shell can be improved, and the sealing effectiveness is ensured. No pressing strip is needed, development of parts can be reduced, the part cost is reduced, and the labor cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to an upper shell of a battery pack and a battery pack. Background Art

[0002] As an important part of the whole pack structure, the upper shell of the battery pack (power battery) plays the role of sealing, reinforcing structure, auxiliary structure, heat insulation, and whole pack sealing. Among them, the sealing function, reinforcing structure function, and heat insulation and fire prevention function are particularly obvious. Failure of these functions will lead to major safety accidents and failure of perceived quality, such as: short circuit fire, high temperature inside the car, NVH abnormality, etc.

[0003] The upper shell of the traditional battery pack adopts a sheet metal structure, and uses pressure strips to strengthen the overall structure to ensure airtightness. However, such a solution is prone to the risk of pressure strip misalignment or inaccurate interface docking, resulting in the failure of bolting, and wastes too much labor costs. Summary of the invention

[0004] In view of this, the present invention provides an upper shell of a battery pack and a battery pack to solve the problems of bead misalignment, interface docking failure and high labor cost when the upper shell of the battery pack is sealed with a bead.

[0005] In a first aspect, the present invention provides an upper shell of a battery pack, the upper shell is an integral stamping structure, including a shell body, a first flange edge and a plurality of convex ribs. The first flange edge is arranged around the edge of the shell body, the first flange edge is used to connect with the lower shell of the battery pack, the first flange edge is provided with a plurality of first assembly holes, and the first assembly holes are arranged at intervals around the shell body; the first flange edge includes a first surface for docking with the lower shell and a second surface away from the lower shell; the convex ribs are arranged on the first surface and / or the second surface of the first flange edge.

[0006] Beneficial effects: The upper shell of the battery pack provided by the present invention can improve the overall structural strength of the upper shell due to the provision of ribs on the first surface and / or the second surface of the first flange edge of the upper shell. At the same time, due to the provision of the ribs, the deformation resistance of the flange edge of the upper shell is enhanced. When the upper shell and the lower shell are connected, the compaction effect between the first surface of the first flange edge of the upper shell and the sealing surface of the second flange edge of the lower shell can be improved to ensure the effectiveness of the seal. At the same time, the traditional battery pack needs to use a pressure strip to press the sealing plane for screw connection to ensure the seal, and it is necessary to develop a mold for the pressure strip, which increases the cost of parts. Compared with this, the present invention does not require a pressure strip, which can reduce the development of components and parts, and reduce the cost of parts; and the present invention can reduce the assembly investment of the pressure strip when assembling the shell, and the present invention can be directly locked to the lower shell, reducing labor costs. Finally, since the purpose of sealing and strengthening the structure can be achieved without assembling the pressure strip, there is no problem of pressure strip misalignment and interface docking failure.

[0007] In an optional embodiment, the convex rib is provided on the second surface of the first flange edge, and the height of the convex rib protruding from the second surface of the first flange edge is H, 1.5 mm≤H≤8 mm;

[0008] And / or, the convex rib is arranged on the first surface of the first flange edge, and the height of the convex rib protruding from the first surface of the first flange edge is not greater than the step protrusion height of the rivet nut of the lower shell.

[0009] In an optional embodiment, each rib is disposed between two adjacent first assembly holes.

[0010] In an optional implementation, the length of the convex rib is L1, the distance between two adjacent first assembly holes is L2, and L1≥2L2 / 3.

[0011] In an optional embodiment, a groove is formed on the surface of the first flange edge facing away from the convex rib at a position corresponding to the convex rib, and the opening width of the groove is W, W ≥ 8 mm, the distance between the first edge of the convex rib and the first edge of the first flange edge is L3, L3 ≥ 4 mm, and / or the distance between the second edge of the convex rib and the second edge of the first flange edge is L4, L4 ≥ 4 mm.

[0012] In an optional embodiment, the wall thickness of the shell body is T, 0.8mm≤T≤1.5mm, and the tensile strength of the shell body is K, K≥260Mpa.

[0013] In an optional embodiment, a heat insulation layer is provided on the outer surface of the shell body away from the battery module, and the heat insulation layer at least covers the area of ​​the shell body corresponding to the battery module.

[0014] In an optional implementation, the thickness of the heat insulation layer is T, T≥2 mm, and the thermal conductivity of the heat insulation layer is λ, λ≤0.1 W / mK.

[0015] In an optional embodiment, the heat insulation layer includes butyl aluminum foil, and the butyl aluminum foil is connected to the upper shell through butyl adhesive.

[0016] In a second aspect, the present invention further provides a battery pack, comprising a battery module, an upper shell of the battery pack of any one of the above technical solutions, and a lower shell. The lower shell is provided with a second flange edge, the second flange edge is provided with a plurality of second assembly holes adapted to the first assembly holes of the upper shell, the first assembly holes and the second assembly holes are penetrated with fasteners to fasten and seal the lower shell and the upper shell; a closed accommodating cavity is formed between the upper shell and the lower shell, and the battery module is arranged in the accommodating cavity.

[0017] Beneficial effect: Because the battery pack includes the upper shell of the battery pack, it has the same effect as the upper shell of the battery pack and is not repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of an upper shell of a battery pack according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A top view of the upper housing shown;

[0021] Figure 3 for Figure 2 A partial enlarged view of the middle rib;

[0022] Figure 4 It is a partial enlarged view of the side view of the convex rib;

[0023] Figure 5 for Figure 1 Exploded diagram of

[0024] Figure 6 It is a schematic diagram of the assembly structure of an upper shell and a lower shell of a battery pack according to an embodiment of the present invention;

[0025] Figure 7 for Figure 6 A partial enlarged view of the middle A;

[0026] Figure 8 for Figure 7 A partial enlarged view of point B in the middle.

[0027] Description of reference numerals:

[0028] 1. Upper shell; 11. Shell body; 12. First flange edge; 13. First assembly hole; 14. Raised rib; 15. Insulation layer; 2. Lower shell; 21. Second flange edge; 22. Second assembly hole; 3. Sealing strip; 4. Rivet nut; 5. Flange bolt. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] Combine the following Figures 1 to 8 , describing an embodiment of the present invention.

[0031] According to an embodiment of the present invention, in a first aspect, an upper shell 1 of a battery pack is provided. The upper shell 1 is an integral stamping structure, comprising a shell body 11, a first flange 12, and a plurality of convex ribs 14. The first flange 12 is arranged around the edge of the shell body 11, and the first flange 12 is used to connect with the lower shell 2 of the battery pack. The first flange 12 is provided with a plurality of first assembly holes 13, and the first assembly holes 13 are arranged at intervals around the shell body 11; the first flange 12 comprises a first surface for docking with the lower shell 2 and a second surface facing away from the lower shell 2; the convex ribs 14 are arranged on the first surface and / or the second surface of the first flange 12.

[0032] The upper shell 1 of the battery pack provided by the present invention can improve the overall structural strength of the upper shell 1 due to the ribs 14 provided on the first surface and / or the second surface of the first flange 12 of the upper shell 1. At the same time, due to the ribs 14, the deformation resistance of the first flange 12 of the upper shell 1 is enhanced. When the upper shell 1 and the lower shell 2 are connected, the compaction effect between the first surface of the first flange 12 of the upper shell 1 and the second flange 21 of the lower shell 2 can be improved to ensure the effectiveness of the seal. At the same time, the traditional battery pack needs to use a bead to press the sealing plane for screw connection to ensure the sealing effect. This solution requires the development of a mold for the bead, which increases the cost of parts. Compared with this, the present invention does not need a bead, which can reduce the development of parts and components and reduce the cost of parts; and the present invention can reduce the assembly investment of the bead during assembly. The present invention can be directly locked to the lower shell 2, reducing labor costs and reducing the overall weight of the battery pack. Finally, since the purpose of sealing and strengthening the structure can be achieved without assembling the bead, there is no problem of bead misalignment and interface docking failure.

[0033] In some embodiments, the rib 14 is disposed on the second surface of the first flange 12 , and the height of the rib 14 protruding from the second surface of the first flange 12 is H, 1.5 mm≤H≤8 mm;

[0034] And / or, the rib 14 is disposed on the first surface of the first flange edge 12 , and the height of the rib 14 protruding from the first surface of the first flange edge 12 is not greater than the step protrusion height of the rivet nut 4 of the lower shell 2 .

[0035] Specifically, when the rib 14 is provided on the second surface of the first flange 12, if H is too small, that is, the height of the rib 14 protruding from the second surface of the first flange 12 is less than 1.5 mm, the rib 14 has a weaker effect on reinforcing the structure of the first flange 12 and the sealing effect between the first flange 12 and the second flange 21 of the lower shell 2. If H is too large, that is, the height of the rib 14 protruding from the second surface of the first flange 12 is greater than 8 mm, the rib 14 is easily torn, increasing the difficulty of forming the rib 14. At the same time, in order to ensure the aspect ratio of the rib 14, if the rib 14 is made too high, the width of the rib 14 is required to be increased accordingly, and the width of the first flange 12 is generally 25 mm. At this time, the rib 14 will overflow the first flange 12, which will affect the sealing effect between the first flange 12 and the second flange 21.

[0036] When the rib 14 is provided on the first surface of the first flange 12, it is required that the height of the rib 14 protruding from the first surface of the first flange 12 is not greater than the height of the step protrusion of the rivet nut 4 of the lower shell 2. Specifically, the second assembly hole 22 of the second flange 21 of the lower shell 2 is provided with the rivet nut 4, and the rivet nut 4 has a step toward the upper shell 1, such as Figure 8 As shown, the height of the rib 14 protruding from the first surface of the first flange 12 is not greater than the height of the step protrusion of the rivet nut 4 of the lower shell 2, so that the rib 14 can play a role in strengthening the structure and sealing effect without affecting the connection between the first flange 12 and the second flange 21. Since there is a sealing strip 3 (such as foam) between the sealing surfaces of the first flange 12 and the second flange 21, when the first flange 12 and the second flange 21 are butted, the rib 14 will compress the sealing strip 3, and the rib 14 will be embedded in the sealing strip 3, further improving the sealing effect.

[0037] In some embodiments, ribs 14 are disposed on both the first surface and the second surface of the first flange 12, and adjacent ribs 14 are staggered between the first surface and the second surface along the length direction of the first flange 12. That is, one rib 14 is disposed on the first surface of the first flange 12, and another adjacent rib 14 is disposed on the second surface of the first flange 12.

[0038] Furthermore, in some embodiments, a groove is formed on the surface of the first flange 12 facing away from the convex rib 14 at a position corresponding to the convex rib 14. For example, when the convex rib 14 is provided on the second surface of the first flange 12, a groove is formed on the first surface of the first flange 12 at a position corresponding to the convex rib 14. This can reduce the overall weight of the battery pack.

[0039] In some embodiments, each rib 14 is disposed between two adjacent first assembly holes 13 .

[0040] This arrangement can ensure that the ribs 14 are reasonably distributed on the first flange edge 12, and ensure that the first flange edge 12 can be tightly pressed against all parts of the second flange edge 21 of the lower shell 2, thereby ensuring a sealing effect.

[0041] In some embodiments, the length of the rib 14 is L1, the distance between two adjacent first assembly holes 13 is L2, and L1 ≥ 2L2 / 3.

[0042] The length L1 of the rib 14 is not less than 2 / 3 of the spacing L2 between two adjacent first assembly holes 13, so as to ensure the structural reinforcement effect of the rib 14 on the first flange edge 12 and the compaction effect between the first flange edge 12 and the second flange edge 21 of the lower shell 2, thereby ensuring the sealing performance.

[0043] In some embodiments, a surface of the first flange 12 facing away from the rib 14 forms a groove at a position corresponding to the rib 14, and the opening width of the groove is W. Figure 4 As shown, W≥8mm, the distance between the first edge of the rib 14 and the first edge of the first flange 12 is L3, L3≥4mm, and / or the distance between the second edge of the rib 14 and the second edge of the first flange 12 is L4, L4≥4mm.

[0044] Specifically, the surface of the first flange 12 facing away from the convex rib 14 is provided with a groove at a position corresponding to the convex rib 14, and the opening width W of the groove is at least 8 mm, which can ensure that the convex rib 14 has a compacting effect on the first flange 12 and the second flange 21 of the lower shell 2, thereby ensuring the sealing performance. At the same time, the two side edges of the convex rib 14 are respectively limited to be not less than 4 mm away from the two side edges of the first flange 12, so that there is enough sealing surface between the first flange 12 and the second flange 21 of the lower shell 2, thereby ensuring the sealing performance.

[0045] In some embodiments, the wall thickness of the shell body 11 is T, 0.8 mm ≤ T ≤ 1.5 mm, and the tensile strength of the shell body 11 is K, K ≥ 260 MPa.

[0046] Such an arrangement can ensure that the shell body 11 itself has sufficient structural strength, and can also achieve a lightweight design of the upper shell 1 of the battery pack, thereby saving costs.

[0047] In addition to the technical problems solved by the above embodiments, the traditional shell process uses internal insulation materials, such as mica sheets, which are attached with adhesive backing, and there is a risk of falling off. At the same time, the heat inside the battery is too high, which can easily cause the internal materials to be in a high heat environment for a long time and fail to achieve the insulation effect.

[0048] In order to further solve this technical problem, in some embodiments, a heat insulating layer 15 is provided on the outer surface of the shell body 11 away from the battery module, and the heat insulating layer 15 at least covers the area of ​​the shell body 11 corresponding to the battery module.

[0049] Since the area of ​​the battery module in the battery pack is the main heat generating area, by providing the heat insulating layer 15 on the surface of the shell body 11 corresponding to the area of ​​the battery module, a heat insulating effect can be achieved to prevent the heat of the battery module from being transferred to the cab of the vehicle. In addition, since the heat insulating layer 15 is provided on the outer surface of the shell body 11, compared with the traditional technical solution provided inside the upper shell 1, the heat insulating layer 15 is far away from the battery module, and a large amount of heat will not be accumulated, which can achieve a good heat insulating effect.

[0050] In some embodiments, the thickness of the heat insulation layer 15 is T, T≥2 mm, and the thermal conductivity of the heat insulation layer 15 is λ, λ≤0.1 W / mK.

[0051] By controlling the thickness T of the heat insulation layer 15 to be greater than 2 mm and the thermal conductivity of the heat insulation layer 15 to be lower than 0.1 W / mK, the heat insulation layer 15 can achieve good heat insulation effect.

[0052] Specifically, the material of the heat insulation layer 15 includes butyl aluminum foil or basalt fiber.

[0053] In some embodiments, the heat insulation layer 15 includes butyl aluminum foil, and the butyl aluminum foil is connected to the upper shell 1 through butyl adhesive.

[0054] The heat insulation layer 15 is made of butyl aluminum foil. The thermal conductivity of butyl aluminum foil is 0.1W / mK, which is lower than that of traditional mica sheets, and can provide a good heat insulation effect. At the same time, butyl aluminum foil can also prevent fire. Butyl aluminum foil is attached to the upper shell 1 by butyl adhesive, which has stronger adhesion ability. At the same time, it can effectively strengthen the structural strength of the upper shell 1, reduce noise, reduce abnormal noise, and improve NVH quality. Among them, HVH refers to noise, vibration and harshness (Noise, Vibration, Harshness).

[0055] According to an embodiment of the present invention, in a second aspect, a battery pack is further provided, comprising a battery module, an upper shell 1 of the battery pack of any one of the above technical solutions, and a lower shell 2. The lower shell 2 is provided with a second flange 21, and the second flange 21 is provided with a plurality of second assembly holes 22 adapted to the first assembly holes 13 of the upper shell 1, and fasteners are passed through the first assembly holes 13 and the second assembly holes 22 to fasten and seal the lower shell 2 and the upper shell 1; a closed accommodating cavity is formed between the upper shell 1 and the lower shell 2, and the battery module is arranged in the accommodating cavity.

[0056] Because the battery pack includes the upper shell 1 of the battery pack, it has the same effect as the upper shell 1 of the battery pack and is not described in detail here.

[0057] Specifically, refer to Figure 7 and Figure 8 The second assembly hole 22 of the lower shell 2 is provided with a rivet nut 4 , and the rivet nut 4 has a step, and the step of the rivet nut 4 protrudes from the surface of the lower shell 2 facing the upper shell 1 .

[0058] Furthermore, the battery pack further includes a sealing strip 3, which is disposed between the first flange edge 12 of the upper shell 1 and the second flange edge 21 of the lower shell 2 to play a sealing role. When the convex rib 14 is disposed on the first surface of the first flange edge 12 of the upper shell 1, the height of the convex rib 14 protruding from the first surface of the first flange edge 12 is not greater than the height of the step of the rivet nut 4 protruding from the surface of the second flange edge 21.

[0059] A third assembly hole is set at a position corresponding to the first assembly hole 13 and the second assembly hole 22 of the sealing strip 3. The fastener includes a flange bolt 5. The first flange edge 12, the sealing strip 3, and the second flange edge 21 are fastened and connected by the flange bolt 5 and the rivet nut 4.

[0060] In addition, compared with traditional battery pack solutions, the battery pack provided by the present invention can reduce weight by 1kg to 1.5kg and save mold costs of approximately 700,000 to 1 million yuan.

[0061] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An upper shell of a battery pack, characterized in that: The upper shell is an integrated stamping structure, comprising: Shell body; A first flange edge is provided around the edge of the shell body, the first flange edge is used to connect with the lower shell of the battery pack, the first flange edge is provided with a plurality of first assembly holes, and the first assembly holes are arranged at intervals around the shell body; the first flange edge includes a first surface for docking with the lower shell and a second surface away from the lower shell; A plurality of convex ribs are arranged on the first surface and / or the second surface of the first flange.

2. The upper shell of the battery pack according to claim 1, characterized in that: The convex rib is provided on the second surface of the first flange edge, and the height of the convex rib protruding from the second surface of the first flange edge is H, 1.5 mm≤H≤8 mm; And / or, the convex rib is arranged on the first surface of the first flange edge, and the height of the convex rib protruding from the first surface of the first flange edge is not greater than the step protrusion height of the rivet nut of the lower shell.

3. The upper shell of the battery pack according to claim 1 or 2, characterized in that: Each of the convex ribs is arranged between two adjacent first assembly holes.

4. The upper shell of the battery pack according to claim 3, characterized in that: The length of the convex rib is L1, the distance between two adjacent first assembly holes is L2, and L1≥2L2 / 3.

5. The upper shell of the battery pack according to claim 1 or 2, characterized in that: A groove is formed on the surface of the first flange edge facing away from the convex rib at a position corresponding to the convex rib, and an opening width of the groove is W, W≥8mm, a distance between a first edge of the convex rib and a first edge of the first flange edge is L3, L3≥4mm, and / or a distance between a second edge of the convex rib and a second edge of the first flange edge is L4, L4≥4mm.

6. The upper shell of the battery pack according to claim 1 or 2, characterized in that: The wall thickness of the shell body is T, 0.8mm≤T≤1.5mm, and the tensile strength of the shell body is K, K≥260Mpa.

7. The upper shell of the battery pack according to claim 1 or 2, characterized in that: An insulation layer is disposed on the outer surface of the shell body away from the battery module, and the insulation layer at least covers the area of ​​the shell body corresponding to the battery module.

8. The upper housing of the battery pack according to claim 7, characterized in that: The thickness of the heat insulation layer is T, T≥2mm, and the thermal conductivity of the heat insulation layer is λ, λ≤0.1W / mK.

9. The upper housing of the battery pack according to claim 7, characterized in that: The heat insulation layer includes butyl aluminum foil, and the butyl aluminum foil is connected to the upper shell through butyl glue.

10. A battery pack, characterized in that: include: Battery module; The upper shell of the battery pack according to any one of claims 1 to 9; A lower shell, wherein the lower shell is provided with a second flange edge, the second flange edge is provided with a plurality of second assembly holes adapted to the first assembly holes of the upper shell, and the first assembly holes and the second assembly holes are penetrated with fasteners to fasten and seal the lower shell and the upper shell; A sealed accommodating cavity is formed between the upper shell and the lower shell, and the battery module is arranged in the accommodating cavity.

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