Battery pack shell and battery pack

Abstract

The utility model relates to the technical field of battery packs, and discloses a battery pack shell and a battery pack, the battery pack shell comprises a main body, the main body comprises a large surface part and a plurality of side surface parts, the plurality of side surface parts are connected with the large surface part along the periphery of the large surface part, and at least the outer surface of the large surface part is coated with a first anti-corrosion layer; and the support is connected with the main body, the joint of the support and the main body is coated with a second anti-corrosion layer, and the thickness of the second anti-corrosion layer is larger than that of the first anti-corrosion layer. The connection position of the support and the main body is coated with the anti-corrosion layer with the large thickness, so that the anti-corrosion effect of the connection position of the support and the main body is guaranteed, and corrosion is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack shell and a battery pack. Background Art

[0002] With the rapid development of electric vehicles, the safety requirements for electric vehicles are getting higher and higher. As the power source of electric vehicles, the safety of power battery packs is of great importance. In electric vehicles, the battery pack is generally located at the bottom of the chassis of the vehicle and connected to the chassis by bolts. The shell of the battery pack, especially the lower surface of the shell, is exposed to the outside and is easily corroded in a humid environment and under the erosion of chemical substances. Therefore, the battery pack shell is usually coated with an anti-corrosion layer. However, the anti-corrosion layer in the prior art usually only has a good anti-corrosion effect on the large surface of the battery pack shell, and has poor anti-corrosion performance on some special structures, which still causes the battery pack shell to be corroded. Utility Model Content

[0003] In view of this, the utility model provides a battery pack shell and a battery pack to solve the problem that the battery pack shell in the prior art has poor anti-corrosion performance, resulting in the battery pack shell being easily corroded.

[0004] In the first aspect, the utility model provides a battery pack shell, comprising: a main body, comprising a large face portion and a side face portion, wherein a plurality of the side face portions are provided, and the plurality of the side face portions are connected to the large face portion along the outer periphery of the large face portion, and at least the outer surface of the large face portion is coated with a first anti-corrosion layer; a bracket, connected to the main body, and a second anti-corrosion layer is coated at the connection between the bracket and the main body, and the thickness of the second anti-corrosion layer is greater than the thickness of the first anti-corrosion layer.

[0005] Beneficial effect: By coating a thick anti-corrosion layer at the connection between the bracket and the main body, the anti-corrosion effect of the connection between the bracket and the main body is ensured to avoid corrosion.

[0006] In an optional embodiment, the thickness of the first anti-corrosion layer is 0.25 mm to 0.5 mm; and / or the thickness of the second anti-corrosion layer is 2.5 mm to 3 mm.

[0007] In an optional embodiment, a snap-fit ​​piece is bonded to the outer surface of the main body, and the outside of the snap-fit ​​piece is coated with a third anti-corrosion layer, and the thickness of the third anti-corrosion layer is greater than the thickness of the first anti-corrosion layer.

[0008] Beneficial effect: The bonding point between the clip and the main body is prone to corrosion. Therefore, by coating a thicker anti-corrosion layer on the outside of the clip, the anti-corrosion effect at the clip is improved.

[0009] In an optional embodiment, the thickness of the third anti-corrosion layer is 1.5 mm to 2 mm.

[0010] In an optional embodiment, the main body further includes a transition connection portion, and the transition connection portion connects two corresponding sides of two adjacent side portions.

[0011] In an optional embodiment, the battery pack shell also includes a reinforcing plate, which is connected to the side portion and the transition connection portion at the same time, and the connection between the reinforcing plate and the side portion and the transition connection portion is coated with a fourth anti-corrosion layer, and the thickness of the fourth anti-corrosion layer is greater than the thickness of the first anti-corrosion layer.

[0012] Beneficial effect: The stress at the transition connection is relatively concentrated. The structural strength of the main body is improved by setting a reinforcing plate. The joints between the reinforcing plate and the side parts and the transition connection are prone to corrosion. Therefore, by coating a thicker anti-corrosion layer, the anti-corrosion effect at the reinforcing plate is improved.

[0013] In an optional embodiment, the thickness of the fourth anti-corrosion layer is 2.5 mm to 3 mm.

[0014] In an optional embodiment, the side surface forms a step structure, and a fifth anti-corrosion layer is coated on the step structure, and the thickness of the fifth anti-corrosion layer is not greater than the thickness of the first anti-corrosion layer.

[0015] In an optional embodiment, the thickness of the fifth anti-corrosion layer is 0.25 mm to 0.5 mm.

[0016] Beneficial effect: On the vehicle, the side part has a better installation environment, and the step structure is formed due to the different plate thicknesses at different positions of the side part, and its performance is consistent with the large surface. Therefore, there is no need to coat the step structure with an excessively thick anti-corrosion layer to avoid waste.

[0017] In a second aspect, the utility model further provides a battery pack, comprising the above-mentioned battery pack shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of a battery pack housing according to an embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the anti-corrosion layer of an embodiment of the utility model;

[0021] Figure 3 for Figure 1 A is a partial enlarged schematic diagram of the middle part.

[0022] Description of reference numerals:

[0023] 1. Main body; 11. Large surface; 12. Side surface; 121. Step structure; 13. Transition connection part; 2. First anti-corrosion layer; 3. Bracket; 4. Second anti-corrosion layer; 5. Fastener; 6. Third anti-corrosion layer; 7. Reinforcement plate; 8. Fourth anti-corrosion layer; 9. Fifth anti-corrosion layer. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0025] Different parts of the battery pack shell have different anti-corrosion requirements due to their different structures, locations, use environments, etc. The following introduces the anti-corrosion layer settings for different parts of the battery pack shell.

[0026] Combine the following Figures 1 to 3 , describing an embodiment of the utility model.

[0027] According to an embodiment of the utility model, on the one hand, a battery pack shell is provided, including: a main body 1, including a large face portion 11 and a side face portion 12, a plurality of side face portions 12 are provided, and the plurality of side face portions 12 are connected to the large face portion 11 along the outer periphery of the large face portion 11, and at least the outer surface of the large face portion 11 is coated with a first anti-corrosion layer 2; a bracket 3, connected to the main body 1, and a second anti-corrosion layer 4 is coated at the connection between the bracket 3 and the main body 1, and the thickness of the second anti-corrosion layer 4 is greater than the thickness of the first anti-corrosion layer 2.

[0028] The battery pack shell of this embodiment is applied to the connection between the bracket 3 and the main body 1 by coating a thick anti-corrosion layer, thereby ensuring the anti-corrosion effect of the connection between the bracket 3 and the main body 1 and avoiding corrosion.

[0029] It is worth noting that the bracket 3 is used to install and fix the battery pack and other parts of the vehicle. The bracket 3 is usually welded to the main body 1 by a spot welding process. The overlap surface between the bracket 3 and the main body 1 is very susceptible to corrosion. Therefore, a thicker anti-corrosion layer needs to be provided to protect the connection between the bracket 3 and the main body 1.

[0030] It should be noted that if Figure 1 As shown, the bracket 3 is provided corresponding to at least one side portion 12. Further, the bracket 3 may be provided with one or more brackets.

[0031] In one embodiment, the thickness of the first anti-corrosion layer 2 is 0.25 mm to 0.5 mm.

[0032] Optionally, in this embodiment, the thickness of the first anti-corrosion layer 2 is 0.5 mm.

[0033] It is worth noting that the large surface 11 has a flat surface and a good coating effect, and a protective plate is usually installed on the outside of the large surface 11. Therefore, the thickness of the first anti-corrosion layer 2 is set to 0.25mm to 0.5mm to meet the anti-corrosion requirements.

[0034] In one embodiment, the thickness of the second anti-corrosion layer 4 is 2.5 mm to 3 mm.

[0035] Optionally, in this embodiment, the thickness of the second anti-corrosion layer 4 is 3 mm.

[0036] In one embodiment, Figure 1 and Figure 2 As shown, a clip 5 is bonded to the outer surface of the main body 1, and a third anti-corrosion layer 6 is coated on the outside of the clip 5. The thickness of the third anti-corrosion layer 6 is greater than that of the first anti-corrosion layer 2. The bonding point between the clip 5 and the main body 1 is prone to corrosion. Therefore, by coating a thicker anti-corrosion layer on the outside of the clip 5, the anti-corrosion effect at the clip 5 is improved.

[0037] It is worth mentioning that please refer to Figure 1 The buckle 5 is bonded to the outer surface of the large surface 11. The buckle 5 is used to install the guard plate to protect the battery pack. Figure 1 As shown, a plurality of fasteners 5 are arranged at intervals.

[0038] In one embodiment, the thickness of the third anti-corrosion layer 6 is 1.5 mm to 2 mm.

[0039] Optionally, in this embodiment, the thickness of the third anti-corrosion layer 6 is 2 mm.

[0040] In one embodiment, Figure 1 As shown, the main body 1 further includes a transition connection portion 13 , and the transition connection portion 13 connects two corresponding sides of two adjacent side portions 12 .

[0041] It is worth mentioning that please refer to Figure 1 The transition connection part 13 is in an arc-shaped structure. Specifically, four transition connection parts 13 are provided, and the four transition connection parts 13 form four corners of the main body 1.

[0042] In one embodiment, Figure 1 and Figure 2 As shown, the battery pack housing also includes a reinforcing plate 7, which is connected to the side portion 12 and the transition connection portion 13 at the same time. The connection between the reinforcing plate 7 and the side portion 12 and the transition connection portion 13 is coated with a fourth anti-corrosion layer 8, and the thickness of the fourth anti-corrosion layer 8 is greater than the thickness of the first anti-corrosion layer 2. The stress at the transition connection portion 13 is relatively concentrated. The structural strength of the main body 1 is improved by setting the reinforcing plate 7. The connection between the reinforcing plate 7 and the side portion 12 and the transition connection portion 13 is prone to corrosion. Therefore, by coating a thicker anti-corrosion layer, the anti-corrosion effect at the reinforcing plate 7 is improved.

[0043] It is worth mentioning that the reinforcing plate 7 is welded to the transition connection part 13 and the side part 12 by a spot welding process. The overlapping surfaces of the reinforcing plate 7, the transition connection part 13 and the side part 12 are very susceptible to corrosion. Therefore, a thicker anti-corrosion layer is required to protect the connection between the reinforcing plate 7, the side part 12 and the transition connection part 13.

[0044] It should be noted that the reinforcing plate 7 is used to strengthen the strength of a local position of the main body 1 and improve the structural performance of the battery pack housing. In this embodiment, four reinforcing plates 7 are provided, and the four reinforcing plates 7 are provided corresponding to the four corners respectively.

[0045] In one embodiment, the thickness of the fourth anti-corrosion layer 8 is 2.5 mm to 3 mm.

[0046] Optionally, in this embodiment, the thickness of the fourth anti-corrosion layer 8 is 3 mm.

[0047] In one embodiment, Figure 1 and Figure 3 As shown, the side surface 12 forms a step structure 121 , and the step structure 121 is coated with a fifth anti-corrosion layer 9 , and the thickness of the fifth anti-corrosion layer 9 is not greater than the thickness of the first anti-corrosion layer 2 .

[0048] Specifically, the thickness of the fifth anti-corrosion layer 9 is 0.25 mm to 0.5 mm. On the vehicle, the installation environment of the side portion 12 is good, and the step structure 121 is formed by the different plate thicknesses at different positions of the side portion 12, and its performance is consistent with the large portion 11, so there is no need to apply an excessively thick anti-corrosion layer to the step structure 121 to avoid waste.

[0049] Optionally, in this embodiment, the thickness of the fifth anti-corrosion layer 9 is 0.25 mm.

[0050] It is worth noting that the formation of the step structure 121 is caused by the thickening of the wall thickness at a local position of the side portion 12, and this setting is intended to improve the structural strength of the battery pack shell.

[0051] It should be noted that for different parts of the battery pack shell, if an equal thickness coating scheme of anti-corrosion layer is adopted, considering the overall anti-corrosion performance of the battery pack shell, all areas need to be coated according to the maximum thickness (i.e. 2.5mm to 3mm), resulting in increased costs. In this embodiment, for parts of the battery pack shell with different structures, positions, and use environments, anti-corrosion layers of different thicknesses are used for protection, which is highly flexible and has low costs while ensuring anti-corrosion performance.

[0052] In one embodiment, the first anti-corrosion layer 2, the second anti-corrosion layer 4, the third anti-corrosion layer 6, the fourth anti-corrosion layer 8 and the fifth anti-corrosion layer 9 are all PVC material layers. Furthermore, the PVC material layers are formed by spraying.

[0053] It is worth mentioning that PVC, or polyvinyl chloride, is often used to make pipes, doors, windows, and floors in the construction field; it is widely used in cable protection tubes in the electrical field; in the automotive field, PVC is used to make automotive interior parts, roof shielding panels, floor coverings, etc.; in the new energy field, PVC is often used for battery pack labels, anti-corrosion sprays, etc. PVC has good stability and corrosion resistance. Whether facing a humid environment or chemical erosion, it has good anti-corrosion properties and is widely used in battery pack anti-corrosion. Secondly, PVC material has good insulation properties and mechanical strength, and plays an irreplaceable role in the field of battery pack anti-corrosion.

[0054] When PVC is applied to the large surface 11, bracket 3, snap-fit ​​part 5, reinforcing plate 7 and step structure 121 of this embodiment, a multi-layer coating scheme is adopted, and the coating is performed by taking the thickness of a layer of PVC applied each time as 0.25 mm as an example. Combined with the position analysis of different components, since the step structure 121 is on the side, it has a low correlation with the coating of other components, so it can be coated in the last process. According to the thickness of different anti-corrosion layers, the bracket 3 and the reinforcing plate 7 need to be coated first. Furthermore, since there is an overlap between the reinforcing plate 7 and the step structure 121, the bracket 3 is preferably coated.

[0055] First, the connection between the bracket 3 and the main body 1 is coated 10 times. At this time, the thickness of the anti-corrosion layer at the bracket 3 is 2.5mm; then, the connection between the reinforcing plate 7 and the transition connection part 13 and the side part 12 is coated 10 times. At this time, the thickness of the anti-corrosion layer at the reinforcing plate 7 is 2.5mm; then, the large surface 11 and the fastener 5 are coated. Since the fastener 5 has a small area and a special structure, it is not convenient to coat it separately. Therefore, the large surface 11, the fastener 5, the bracket 3 and the reinforcing plate 7 are coated as a whole twice. At this time, the thickness of the anti-corrosion layer at the large surface 11 is 0.5mm, which meets the requirements, and the thickness of the anti-corrosion layer at the bracket 3 is 3mm, which meets the requirements. The thickness of the anti-corrosion layer at the plate 7 is 3mm, which meets the requirements, and the thickness of the anti-corrosion layer at the fastener 5 is 0.5mm; then, the large surface 11 and the fastener 5 are coated as a whole 6 times. At this time, the thickness of the anti-corrosion layer at the fastener 5 is 2mm, which meets the requirements (because it is inconvenient to coat the fastener 5 separately, the thickness of the anti-corrosion layer of the large surface 11 is also 2mm at this time, which is over-coating, but in fact, the thickness of the anti-corrosion layer of the large surface 11 only needs 0.25mm to 0.5mm to meet the anti-corrosion requirements); finally, the step structure 121 is coated once. At this time, the thickness of the anti-corrosion layer at the step structure 121 is 0.25mm, which meets the requirements.

[0056] According to an embodiment of the present invention, on the other hand, a battery pack is provided, comprising the above-mentioned battery pack housing.

[0057] Although the embodiments of the present invention are 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. A battery pack housing, characterized in that: include: The main body comprises a large face portion and a side face portion, wherein the side face portions are provided in a plurality and are connected to the large face portion along the outer periphery of the large face portion, and at least the outer surface of the large face portion is coated with a first anti-corrosion layer; The bracket is connected to the main body, and the connection between the bracket and the main body is coated with a second anti-corrosion layer, and the thickness of the second anti-corrosion layer is greater than the thickness of the first anti-corrosion layer.

2. The battery pack housing according to claim 1, characterized in that: The thickness of the first anti-corrosion layer is 0.25 mm to 0.5 mm; and / or, The thickness of the second anti-corrosion layer is 2.5 mm to 3 mm.

3. The battery pack housing according to claim 1 or 2, characterized in that: A snap fastener is bonded to the outer surface of the main body, and a third anti-corrosion layer is coated on the outside of the snap fastener. The thickness of the third anti-corrosion layer is greater than that of the first anti-corrosion layer.

4. The battery pack housing according to claim 3, characterized in that: The thickness of the third anti-corrosion layer is 1.5 mm to 2 mm.

5. The battery pack housing according to claim 1 or 2, characterized in that: The main body also includes a transition connection portion, which connects two sides corresponding to each other of two adjacent side portions.

6. The battery pack housing according to claim 5, characterized in that: The battery pack shell also includes a reinforcing plate, which is connected to the side portion and the transition connection portion at the same time. The connection between the reinforcing plate, the side portion and the transition connection portion is coated with a fourth anti-corrosion layer, and the thickness of the fourth anti-corrosion layer is greater than the thickness of the first anti-corrosion layer.

7. The battery pack casing according to claim 6, characterized in that: The thickness of the fourth anti-corrosion layer is 2.5 mm to 3 mm.

8. The battery pack housing according to claim 1 or 2, characterized in that: The side surface forms a step structure, and a fifth anti-corrosion layer is coated on the step structure. The thickness of the fifth anti-corrosion layer is not greater than the thickness of the first anti-corrosion layer.

9. The battery pack casing according to claim 8, characterized in that: The thickness of the fifth anti-corrosion layer is 0.25 mm to 0.5 mm.

10. A battery pack, characterized in that: A battery pack casing comprising the battery pack casing according to any one of claims 1 to 9.

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