Battery pack shell structure

Abstract

The utility model provides a battery pack shell structure which comprises a lower shell, an upper shell and a first anti-corrosion patch, the lower shell and the upper shell are buckled, the first anti-corrosion patch is arranged at the top of the upper shell, a rivet is arranged on the upper shell, and the rivet is sequentially riveted with the first anti-corrosion patch, the upper shell and the lower shell from top to bottom. According to the battery pack shell disclosed by the utility model, the anti-corrosion patch is pasted in advance before riveting, so that the problem of poor sealing property caused by a boss surface is effectively solved, glue solidification or other spraying procedures are not needed, time is saved, and the process, equipment and time cost of a battery pack is greatly reduced; the problem that the position degree is poor due to the fact that the rivet is riveted firstly and then the anti-corrosion patch is pasted is solved, high-precision positioning is achieved through riveting positioning, and the risk of corrosion failure is greatly reduced.

Description

Technical Field

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

[0002] At present, common connections and seals basically adopt the form of bolt connection plus sealing strip. This connection method requires pre-drilling holes on the upper and lower shells and the sealing strips, and pre-opening limit grooves on the shells. The installation accuracy and cost are relatively high, and the process is complicated.

[0003] Some current battery packs have a large demand for cost reduction and high integration, and conventional connection methods are gradually being replaced. SPR (self-piercing rivet) riveting has become a better choice due to its low cost and reliable connection. However, SPR coatings are mostly ALMAC (Aluminum Manganese Alloy Coated) with a corrosion resistance of 240h or a 96h galvanized layer, which is difficult to meet the salt spray requirements of the entire package for 720h or 1000h. In addition, rivets will damage the original coating of the sheet metal shell, increasing the risk of corrosion failure of the sheet metal around the rivets.

[0004] At present, the commonly used SPR anti-corrosion solution is to paste anti-corrosion patches or apply glue at the rivet position after SPR riveting is completed. Among them, the glue coating solution has high requirements for equipment, requires shielding, and the glue curing time is long, which affects the production rhythm. The conventional anti-corrosion patch solution, because after SPR riveting, there will be a 1.5-2mm boss at the bottom of the plate, the patch is easy to wrinkle and often leaves a gap connected to the outside world, which is easy to cause anti-corrosion failure and is not conducive to improving the safety of the battery pack. Utility Model Content

[0005] In view of this, the utility model aims to provide a battery pack shell structure to enhance the anti-corrosion effect of the shell riveting position and the rivets.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A battery pack shell structure includes a lower shell and an upper shell that are snapped together, and a first anti-corrosion patch arranged on the top of the upper shell. Rivets are provided on the upper shell, and the rivets rivet the first anti-corrosion patch, the upper shell and the lower shell in sequence from top to bottom.

[0008] Furthermore, the rivets are SPR rivets.

[0009] Furthermore, the bottom of the lower shell is formed with a downward protrusion due to the rivet riveting, and before the rivet riveting, a second anti-corrosion patch covering the protrusion is provided on the lower shell.

[0010] Furthermore, the first anti-corrosion patch and the second anti-corrosion patch both include a metal layer and an adhesive layer connected in sequence.

[0011] Furthermore, a removable release paper is provided on a side of the adhesive layer away from the metal layer.

[0012] Furthermore, the thickness of the first anti-corrosion patch and / or the second anti-corrosion patch is between 50-3000 μm.

[0013] Furthermore, the thickness of the adhesive layer is between 0.015-0.1 mm; and / or the thickness of the metal layer is between 0.05-2 mm.

[0014] Furthermore, the cross-section of the first anti-corrosion patch and / or the second anti-corrosion patch is circular, and the radius size is between 13.5-14.5 mm.

[0015] Furthermore, the metal layer is made of zinc.

[0016] Furthermore, a sealing layer is provided between the lower shell and the upper shell.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The battery pack shell described in the utility model is riveted with a first anti-corrosion patch, an upper shell and a lower shell in sequence from top to bottom by rivets, thereby avoiding damage to the original anti-corrosion coating on the surface of the upper shell after riveting, and also avoiding warping of the top coating of the upper shell due to riveting, causing wrinkles on the first anti-corrosion patch when pasted, resulting in anti-corrosion failure, thereby improving the corrosion resistance of the riveting position of the upper shell and the rivets, thereby improving the safety of the entire package.

[0019] Secondly, the rivets used are SPR rivets, which have low cost and reliable connection. Compared with other connections, they have wide material compatibility and are convenient and efficient in the riveting process, which is conducive to improving the assembly efficiency of the whole package. Before the rivets are riveted, the second anti-corrosion patch is set on the lower surface of the lower shell, thereby avoiding irregular protrusions formed by riveting on the lower shell, resulting in wrinkles on the patch and gaps with the outside, thereby improving the corrosion resistance of the lower shell and the sealing between the patch and the lower shell.

[0020] Furthermore, the first anti-corrosion patch and the second anti-corrosion patch both include a metal layer and an adhesive layer. The metal layer is used here to improve the strength, prevent the anti-corrosion patch from wrinkling, and ensure its fitting effect with the plate. The adhesive layer can improve the connection strength between the metal layer and the upper and lower shells. The release paper has good anti-stick properties and can protect the adhesive layer. Moreover, the thickness of the first anti-corrosion patch and the second anti-corrosion patch is set between 50-3000μm, which can meet the anti-corrosion and sealing requirements while ensuring the effectiveness of the connection. The thickness of the adhesive layer is set between 0.015-0.1mm, and the thickness of the metal layer is set between 0.05-2mm, which is conducive to meeting the bonding requirements.

[0021] In addition, the metal layer is made of zinc, which can take advantage of the characteristics of zinc as an active metal and combine it with the principle of sacrificial anode protection to effectively achieve corrosion protection at the rivet position. A sealant layer is provided between the upper shell and the lower shell to improve the overall sealing of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0023] Figure 1 An exploded view of the battery pack housing structure according to an embodiment of the present utility model;

[0024] Figure 2 A bottom schematic diagram of a battery pack housing structure according to an embodiment of the present utility model;

[0025] Figure 3 It is an overall schematic diagram of the battery pack housing structure according to an embodiment of the utility model;

[0026] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of the part indicated by section BB;

[0027] Figure 5 It is a schematic diagram of the overall structure of the first anti-corrosion patch or the second anti-corrosion patch according to an embodiment of the utility model;

[0028] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of the portion indicated by AA;

[0029] Description of reference numerals:

[0030] 1. upper shell; 11. rivet; 12. first anti-corrosion patch; 121. metal layer; 122. adhesive layer; 123. release paper; 13. first connecting flange;

[0031] 2. lower shell; 21. raised portion; 22. second anti-corrosion patch; 23. second connecting flange;

[0032] 3. Sealant layer;

[0033] R, the radius of the first anti-corrosion patch or the second anti-corrosion patch; t1, the thickness of the metal layer; t2, the thickness of the adhesive layer; t3, the thickness of the release paper. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] Taking the battery pack described in the present invention as an example, the directional words used in the embodiments, such as "up, down, left, right, front, back" are based on Figure 1 The battery pack in the shown state is defined based on the up and down direction (also called the height direction, or the Z direction of the whole pack), the left and right direction (also called the width direction, or the Y direction of the whole pack), and the front and back direction (also called the length direction, or the X direction of the whole pack).

[0037] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] Embodiment 1

[0040] The present embodiment relates to a battery pack shell structure to improve the anti-corrosion effect of the shell riveting position and rivets.

[0041] In terms of overall structure, Figure 1As shown, the battery pack shell structure of this embodiment includes a lower shell 2 and an upper shell 1 that are buckled together, and a first anti-corrosion patch 12 arranged on the top of the upper shell 1. The upper shell 1 is provided with a rivet 11, and the rivet 11 rivets the first anti-corrosion patch 12, the upper shell 1 and the lower shell 2 in sequence from top to bottom.

[0042] Here, by sticking the first anti-corrosion patch 12 on the top of the upper shell 1 before the rivet 11 is riveted, it is possible to avoid damage to the original anti-corrosion coating on the surface of the upper shell 1 after the rivet 11 is riveted, and it is possible to prevent the top coating of the upper shell 1 from warping due to riveting, thereby preventing the first anti-corrosion patch 12 from wrinkling when pasting, thereby improving the riveting position of the upper shell 1 and the corrosion resistance of the rivet 11.

[0043] Based on the above overall introduction, in this embodiment, as a preferred implementation form, the rivet 11 adopts SPR rivets. Compared with ordinary riveting, SPR rivets have the advantages of low cost and reliable connection, and are convenient and efficient during the riveting process, which is conducive to improving the riveting efficiency.

[0044] In addition, in this embodiment, as a preferred implementation form, Figure 2 and Figure 4 As shown, the bottom of the lower shell 2 is formed with a downward protrusion 21 due to the riveting of the rivet 11, and before the rivet 11 is riveted, a second anti-corrosion patch 22 covering the protrusion 21 is provided on the lower shell 2.

[0045] It should be mentioned here that the protrusion 21 formed by the riveting of the rivet 11 usually has a protruding size between 1.5 and 2 mm, and the second anti-corrosion patch 22 can be deformed following the forming of the protrusion 21, and fits tightly with the protrusion 21 and its surrounding area, so as to avoid patch wrinkles caused by the protrusion 21 and the existence of a gap connected to the outside, thereby improving the corrosion resistance of the riveted position of the lower shell 2 and the sealing between the second anti-corrosion patch 22 and the lower shell 2.

[0046] Secondly, in this embodiment, as a preferred implementation form, Figure 5 and Figure 6 As shown, the first anti-corrosion patch 12 and the second anti-corrosion patch 22 each include a metal layer 121 and an adhesive layer 122 connected in sequence. The metal layer 121 is provided to improve strength, prevent wrinkles on the anti-corrosion patch, and ensure the bonding effect with the plate. The adhesive layer 122 can improve the connection strength between the metal layer 121 and the upper shell 1, and between the metal layer 121 and the lower shell 2.

[0047] It is worth mentioning here that the adhesive layer 122 can be made of adhesive products well known to those skilled in the art, such as acrylic adhesives, which can improve the reliability of bonding between the patch and the board, and will not peel off from the board and cause corrosion failure even under high temperature, high humidity or water immersion conditions.

[0048] In specific implementation, the metal layer 121 is combined with the adhesive layer 122 and pre-attached to the position where riveting is required. Through the principle of sacrificial anode protection, the corrosion protection of the riveted position is effectively achieved. The presence of active metal greatly reduces the risk of corrosion failure of the rivet 11.

[0049] At the same time, in this embodiment, as a preferred implementation form, Figure 6 As shown, a removable release paper 123 is provided on one side of the adhesive layer 122 away from the metal layer 121. The release paper 123 has good anti-adhesive properties. In order to better protect the adhesive layer 122, preferably, the thickness t3 of the release paper 123 can be set to 0.075 mm. In specific implementation, the release paper 123 is first torn off, and then the anti-corrosion patch is attached to the corresponding position before the shell needs to be riveted, that is, the first anti-corrosion patch 12 is attached to the riveting position of the upper shell 1, and the second anti-corrosion patch 22 is attached to the riveting position of the lower shell 2.

[0050] In addition, in this embodiment, as a preferred implementation form, the thickness of the first anti-corrosion patch 12 and the second anti-corrosion patch 22 is between 50-3000 μm, thereby meeting the anti-corrosion and sealing requirements while ensuring the effectiveness of the connection.

[0051] During specific implementation, the thickness of the first anti-corrosion patch 12 and the second anti-corrosion patch 22 can be set and adjusted accordingly according to the spatial dimensions of the battery pack in the Z direction. Too thick may result in incomplete riveting or too few riveted parts of the lower shell 2, and too thin may result in poor anti-corrosion and sealing performance. Preferably, the thickness of the first anti-corrosion patch 12 and the second anti-corrosion patch 22 is set to 95μm, and can also be set to 90μm or 100μm.

[0052] Moreover, in this embodiment, as a preferred implementation form, the thickness of the adhesive layer 122 is between 0.015-0.1 mm, and the thickness of the metal layer 121 is between 0.05-2 mm. In order to better meet the bonding requirements, the thickness t2 of the adhesive layer 122 is preferably set to 0.025 mm, and can also be set to 0.055 mm or 0.075 mm, and the thickness t1 of the metal layer 121 is preferably set to 0.07 mm, and can also be set to 0.12 mm or 0.17 mm under the premise of meeting the patch strength.

[0053] In addition, in this embodiment, as a preferred implementation form, Figure 5As shown, the cross-section of the first anticorrosion patch 12 and the second anticorrosion patch 22 is circular, and the radius size is between 13.5-14.5 mm. Here, the patch size can be adjusted according to the diameter of the rivet 11 and the operable space. In this embodiment, the radius R of the first anticorrosion patch 12 or the second anticorrosion patch 22 is preferably set to 14 mm. It is worth noting that the size of the patch needs to be larger than the size of the head of the rivet 11. According to actual needs, the radius R can also be set to 13.5 mm or 14.5 mm.

[0054] Furthermore, in this embodiment, as a preferred implementation form, the metal layer 121 is made of zinc. Zinc is an active metal, and can protect the rivet 11 and the plate from corrosion through the sacrificial anode protection method.

[0055] In addition, in this embodiment, as a preferred implementation form, a sealant layer 3 is provided between the lower shell 2 and the upper shell 1. Here, in order to better improve the overall sealing of the battery pack, the thickness of the sealant layer 3 can be set to between 0.2-0.8 mm. Too thick may cause the sealant layer 3 to overflow, and too thin may cause poor sealing performance. Preferably, the thickness of the sealant layer can be set to 0.3 mm, and can also be set to 0.5 mm or 0.7 mm without destroying the sealing of the battery pack.

[0056] It is worth mentioning that the sealant layer 3 can refer to sealing products well known to those skilled in the art, such as sealant and the like.

[0057] It is worth mentioning that the relevant structural parts not mentioned in the battery pack of this embodiment can refer to the various structures of the battery pack products well known to technical personnel in this field, such as the first connecting flange 13 provided on the upper shell 1, the second connecting flange 23 provided on the lower shell 2, etc.

[0058] Conventional anti-corrosion patch solutions, after SPR riveting, there will be a 1.5-2mm convex portion at the bottom of the plate, the patch is prone to wrinkles and often leaves a gap connected to the outside world, resulting in anti-corrosion failure. The top of the rivet 11 cannot be pasted flat due to the warping of the coating.

[0059] During the implementation of this embodiment, a sealant layer 3 is first applied to the second connecting flange 23 of the lower shell 2, and then the first connecting flange 13 of the upper shell 1 is connected to the second connecting flange 23 of the lower shell 2. After that, anti-corrosion patches are affixed to designated positions on the upper surface of the upper shell 1 and the lower surface of the lower shell 2 of the battery pack, and rivets 11 are riveted within the range of the anti-corrosion patches. The riveting direction is from the upper plate to the lower plate, so as to solve the problem that after the rivets 11 are riveted, the coating on the top plate of the upper shell 1 and the irregular protrusion 21 formed on the bottom plate of the lower shell 2 cause the anti-corrosion patches to wrinkle and fail to effectively fit with the plates.

[0060] It is worth mentioning here that a plurality of rivets 11 are arranged at intervals along the circumference of the battery pack shell, and the specific number of the rivets 11 can be set according to actual connection requirements.

[0061] When the upper shell 1 and the lower shell 2 of the battery pack shell structure of this embodiment are riveted, there is no need to apply glue or spray on the position after the rivet 11 is riveted. Instead, an anti-corrosion patch is pre-pasted manually or automatically before riveting, which effectively solves the problem of poor sealing caused by the convex surface. There is no need to wait for the glue to cure or add other spraying steps, which saves time and greatly reduces the process, equipment, and time costs of the battery pack. It avoids the problem of poor positioning caused by first riveting the rivet 11 and then pasting the anti-corrosion patch. High-precision positioning is achieved through riveting positioning, which greatly reduces the risk of corrosion failure.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack housing structure, characterized in that: It comprises a lower shell and an upper shell that are fastened together, and a first anti-corrosion patch arranged on the top of the upper shell. The upper shell is provided with rivets, and the rivets rivet the first anti-corrosion patch, the upper shell and the lower shell in sequence from top to bottom.

2. The battery pack housing structure according to claim 1, characterized in that: The rivets are SPR rivets.

3. The battery pack housing structure according to claim 2, characterized in that: The bottom of the lower shell is formed with a downward protrusion due to the rivet riveting, and before the rivet riveting, a second anti-corrosion patch covering the protrusion is provided on the lower shell.

4. The battery pack housing structure according to claim 3, characterized in that: The first anti-corrosion patch and the second anti-corrosion patch both include a metal layer and an adhesive layer connected in sequence.

5. The battery pack housing structure according to claim 4, characterized in that: A removable release paper is provided on a side of the adhesive layer away from the metal layer.

6. The battery pack housing structure according to claim 4, characterized in that: The thickness of the first anti-corrosion patch and / or the second anti-corrosion patch is between 50-3000 μm.

7. The battery pack housing structure according to claim 6, characterized in that: The thickness of the adhesive layer is between 0.015-0.1 mm; and / or the thickness of the metal layer is between 0.05-2 mm.

8. The battery pack housing structure according to claim 4, characterized in that: The cross section of the first anti-corrosion patch and / or the second anti-corrosion patch is circular, and the radius size is between 13.5-14.5 mm.

9. The battery pack housing structure according to claim 4, characterized in that: The metal layer is made of zinc.

10. The battery pack housing structure according to any one of claims 1 to 9, characterized in that: A sealing layer is provided between the lower shell and the upper shell.

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