Battery pack shell

Abstract

The utility model provides a battery pack shell. The battery pack shell comprises a lower shell with a boundary beam and an upper shell with a connecting flange connected with the boundary beam, a reinforcing structure used for enhancing the structural strength of the connecting flange is arranged on the connecting flange, and a sealing strip is arranged between the connecting flange and the edge beam. According to the battery pack shell disclosed by the utility model, the structural strength of the connecting turnup can be enhanced by utilizing the reinforcing structure, so that the scheme that a traditional battery pack is provided with a pressing strip is omitted, the pressing effect on the sealing strip can be improved by utilizing the connecting turnup with high structural strength, and the sealing performance between the connecting turnup and the edge beam by the sealing strip is ensured; therefore, on the premise of ensuring the sealing performance and the structural strength performance of the battery pack shell, the cost reduction design can be realized, so that the market competitiveness of the battery pack can be improved.

Description

Technical Field

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

[0002] At present, the proportion of electric vehicles in the automotive industry is increasing year by year, and with it comes increasingly fierce price competition in the automotive industry, which forces automobile manufacturers to continuously reduce the price range of auto parts. Among them, power batteries, which account for a large proportion of the price of electric vehicles, are the first to be affected. Therefore, under the premise of ensuring higher performance and quality requirements, the primary task facing power battery manufacturers is to design and produce battery packs with lower costs.

[0003] However, in order to ensure the normal function of electric vehicles under various environmental conditions, the power battery pack must meet the sealing requirements of IP68 (enclosure protection grade) and IPX9K (international protection grade standard). However, the existing battery pack is generally composed of upper shell, shell pressure strip, sealing strip, lower shell and fasteners. The parts are of many types and heavy, resulting in high cost of the whole pack sealing solution, which cannot meet the cost reduction design requirements. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery pack housing, which is conducive to achieving the purpose of cost reduction.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery pack shell, comprising a lower shell having a side beam, and an upper shell connected to the side beam;

[0007] The upper shell body is provided with a connecting flange connected to the side beam, and the connecting flange is provided with a reinforcing structure for enhancing its own structural strength, and a sealing strip is provided between the connecting flange and the side beam.

[0008] Furthermore, the top wall of the side beam has a supporting portion extending toward one side of the interior of the lower shell.

[0009] Furthermore, along the width direction of the side beam, the width dimension L1 of the top wall and the width dimension of the sealing strip are not less than 25 mm.

[0010] Furthermore, the extension dimension L3 of the support portion is between 5-10 mm.

[0011] Furthermore, the connecting flange is connected to the side beam via a fastener.

[0012] Furthermore, the reinforcement structure includes a plurality of reinforcement ribs arranged on the connecting flange.

[0013] Furthermore, the fasteners are multiple and spaced apart along the extension direction of the connecting flange, and the reinforcing ribs are provided between two adjacent fasteners; and / or, each of the reinforcing ribs is extended along the extension direction of the connecting flange.

[0014] Furthermore, the fastener is composed of a rivet nut and a bolt.

[0015] Furthermore, the side beam includes side walls arranged on both sides of the top wall; a first round chamfer is arranged between the inner side of the outer side wall and the top wall, and the relationship between the distance L11 between the central axis o of the rivet nut and the outer side of the outer side wall, the radius R of the first round chamfer and the spacing dimension L4 between the central axis o of the rivet nut and the first round chamfer is: L11=L4+R+t+0.75mm, wherein t is the wall thickness of the outer side wall, 0.75mm is the installation tolerance of the central axis o of the rivet nut relative to its own installation point, and / or, the relationship between the distance L12 between the central axis o of the rivet nut and the outer side of the inner side wall and the flange surface radius r of the rivet nut is: L12=r+8mm+0.75mm, wherein 8mm is the preset sealing distance from the flange surface edge of the rivet nut to the outer side of the inner side wall, and 0.75mm is the installation tolerance of the central axis o of the rivet nut relative to its own installation point.

[0016] Furthermore, the reinforcement structure includes a reinforcement flange formed by bending the edge of the connecting flange toward one side of the side beam.

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

[0018] The battery pack shell described in the utility model can provide a sealing strip between the connecting flange and the side beam, and provide a reinforcing structure on the connecting flange. Not only can the reinforcing structure be used to enhance the structural strength of the connecting flange, thereby eliminating the solution of providing a pressure strip in the traditional battery pack and reducing the use of parts, but also the connecting flange with high structural strength can be used to enhance the compression effect of the sealing strip, thereby ensuring the sealing performance of the sealing strip between the connecting flange and the side beam. This can facilitate cost reduction design while ensuring the sealing performance and structural strength performance of the battery pack shell.

[0019] In addition, the support portion extending toward the inner side of the lower shell can increase the connection area between the top wall and the connecting flange, which is beneficial to the arrangement of the sealing strip and the full compression of the sealing strip, thereby improving the sealing performance of the whole package. The width of the top wall and the width of the sealing strip are not less than 25mm, which is beneficial to ensure that the entire section of the sealing strip in the extension direction has a compressed part, avoiding the formation of a gap between the sealing strip and the connecting flange or side beam, which may cause sealing failure.

[0020] Secondly, the extension size of the support part is between 5-10mm, which is conducive to reducing the weight and materials of the side beam while ensuring the sealing effect of the whole package, and is conducive to achieving cost reduction and weight reduction design. The connecting flange is connected to the side beam through fasteners, with a simple structure and high connection reliability. Multiple reinforcing ribs are set to improve the structural strength of the connecting flange.

[0021] In addition, multiple fasteners are provided, and reinforcing ribs are provided between two adjacent fasteners, and each reinforcing rib is arranged along the extension direction of the connecting flange, which can improve the structural strength of the connecting flange without affecting the sealing effect of the sealing strip on the connecting flange and the side beam, thereby improving the structural performance of the entire package. The fasteners are composed of rivet nuts and bolts, making the connection process between the connecting flange, the sealing strip and the side beam simpler and easier to operate, saving time and effort, and having high connection stability. The setting of the reinforcing flange is beneficial to the structural strength of the connecting flange, thereby ensuring the structural performance and sealing performance of the entire package. 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 This is a schematic diagram of the overall structure of the battery pack housing according to an embodiment of the utility model;

[0024] Figure 2 for Figure 1 A schematic diagram of a portion of the structure shown;

[0025] Description of reference numerals:

[0026] 1. side beam; 11. top wall; 111. support portion; 12. bottom wall; 13. side wall;

[0027] 2. Upper shell; 21. Connecting flange; 211. Reinforcing rib; 212. Reinforcing flange;

[0028] 3. Sealing strip; 4. Fastener; 41. Rivet nut; 42. Bolt;

[0029] L1, width of the top wall; L2, spacing between the two side walls; L3, extension of the support portion; L4, spacing between the center axis of the rivet nut and the first round chamfer; L11, distance between the center axis of the rivet nut and the outside of the outer side wall; L12, distance between the center axis of the rivet nut and the outside of the inner side wall; R, radius of the first round chamfer. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0034] The present embodiment relates to a battery pack shell, which can reduce the types of components of the entire pack sealing solution and reduce the weight of the sealing solution while maintaining the battery pack meeting high performance and harsh environment operating conditions, thereby achieving low cost of the entire pack sealing solution and reducing the cost of the entire battery pack.

[0035] In terms of overall structure, Figure 1 and Figure 2 As shown, the battery pack shell of this embodiment includes a lower shell having a side beam 1, and an upper shell 2 having a connecting flange 21 connected to the side beam 1. The upper shell 2 is provided with a connecting flange 21 connected to the side beam 1, and a reinforcing structure for enhancing its own structural strength is provided on the connecting flange 21, and a sealing strip 3 is provided between the connecting flange 21 and the side beam 1.

[0036] It can be understood that the design of the reinforced structure of the present embodiment is conducive to improving the structural strength of the connecting flange 21, and further improving the connection reliability between the connecting flange 21 and the side beam 1, thereby ensuring the effective compression of the sealing strip 3 to ensure the sealing performance. Moreover, the setting of the reinforced structure can replace the method of using pressure strips in traditional battery pack solutions to improve the structural performance and sealing performance of the upper and lower shell connections, so that the whole package has both good structural performance and sealing performance, as well as the beneficial effect of low cost.

[0037] It is worth mentioning that all structures not mentioned in the battery pack shell of the present embodiment can refer to the relevant structural parts of the common battery pack products in the prior art. For example, the upper shell 2 includes a main body, and the above-mentioned connecting flange 21 formed by folding the edge of the main body toward the side of the lower shell. At the same time, the lower shell includes a bottom plate, and the above-mentioned side beam 1 is arranged on the bottom plate and extends along the periphery of the bottom plate to enclose the bottom plate to form an installation cavity for installing the battery cell module.

[0038] Based on the above overall introduction, in this embodiment, as a preferred implementation form, Figure 1 As shown, the top wall 11 of the side beam 1 has a support portion 111 extending toward the inner side of the lower shell. This arrangement can increase the connection area between the top wall 11 and the connecting flange 21, facilitate the arrangement of the sealing strip 3 and fully compress the sealing strip 3, thereby improving the sealing performance of the entire package.

[0039] It should be mentioned that, for the various structures not mentioned in the side beam 1 of the present embodiment, reference may be made to the relevant structural parts of the battery pack side beam 1 well known to those skilled in the art. For example, the side beam 1 includes a bottom wall 12 connected to the bottom plate of the battery pack, two side walls 13 arranged opposite to each other on the bottom wall 12, and the above-mentioned top wall 11 arranged on the top of the two side walls 13, and if necessary, reinforcing ribs for enhancing the structural strength may be provided between the two side walls 13.

[0040] Specifically, in this embodiment, as a preferred implementation form, Figure 2 As shown, along the width direction of the side beam 1, the width dimension L1 of the top wall 11 and the width dimension of the sealing strip 3 are not less than 25 mm. The advantage of such a configuration is that it is conducive to ensuring that the entire section of the sealing strip 3 in the extension direction has a compressed portion, that is, each section of the sealing strip 3 is in a compressed portion in the width direction of the top wall 11, avoiding the formation of a gap between the sealing strip 3 and the connecting flange 21 or the side beam 1, which causes sealing failure.

[0041] Secondly, in this embodiment, as a preferred implementation form, the extension dimension L3 of the support portion 111 is between 5-10 mm, that is, the spacing dimension L2 between the two side walls 13 is between 15-20 mm. This can help reduce the weight and material of the side beam 1 while ensuring the sealing effect of the entire package, thereby facilitating cost and weight reduction design.

[0042] It can be understood that the value of the width dimension L1 of the top wall 11 of this embodiment is equal to the sum of the extension dimension L3 of the support portion 111 and the spacing dimension L2 between the two side walls 13, and in specific implementation, L1 can be 25mm, 27mm or 30mm, etc., to ensure the sealing performance of the whole package. Under this premise, L2 and L3 can be adjusted according to the actual structural performance requirements of the whole package. For example, L2 is 15mm and L3 is 10mm to make the whole package more lightweight, or L2 is 20mm and L3 is 5mm to make the whole package have better structural strength.

[0043] In addition, in this embodiment, as a preferred implementation form, Figure 1 and Figure 2 As shown, the connecting flange 21 is connected to the side beam 1 through the fastener 4, so that the connection structure is simple and the connection reliability is higher.

[0044] Furthermore, in this embodiment, as a preferred implementation form, the reinforcement structure includes a plurality of reinforcement ribs 211 disposed on the connecting flange 21 to help improve the structural strength of the connecting flange 21 .

[0045] In the specific implementation, in this embodiment, as a preferred implementation form, continue to refer to Figure 1 As shown, there are multiple fasteners 4 arranged at intervals along the extension direction of the connecting flange 21, and a reinforcing rib 211 is provided between two adjacent fasteners 4. At the same time, as a preferred embodiment, each reinforcing rib 211 is extended along the extension direction of the connecting flange 21.

[0046] It can be understood that a plurality of fasteners 4 are provided, and reinforcing ribs 211 are provided between two adjacent fasteners 4, and each reinforcing rib 211 is extended along the extension direction of the connecting flange 21, which can avoid the adverse effect of the reinforcing ribs 211 on the compression effect of the sealing strip 3. Under the premise of not affecting the sealing effect of the sealing strip 3 on the connecting flange 21 and the side beam 1, the structural strength of the connecting flange 21 is improved, thereby helping to improve the structural performance of the entire package.

[0047] Of course, in addition to being extended along the extension direction of the connecting flange 21 and arranged between adjacent fasteners 4, the reinforcing ribs 211 of the present embodiment may also be set and adjusted accordingly according to actual structural reinforcement requirements. For example, the reinforcing rib 211 may be arranged on the side of the line between two adjacent fasteners 4 that is away from the main body (upper shell 2), and the reinforcing rib 211 may be arranged along the extension direction of the connecting flange 21, or may be arranged in a direction perpendicular to the extension direction of the connecting flange 21, etc.

[0048] Furthermore, in this embodiment, as a preferred implementation form, Figure 2As shown, the fastener 4 is composed of a rivet nut 41 and a bolt 42. The advantage of this arrangement is that it can make the connection process between the flange 21, the sealing strip 3 and the side beam 1 simpler and easier to operate, saving time and effort, and the connection stability is high.

[0049] In addition, it is worth mentioning that, as a preferred implementation form, a first round chamfer is provided between the inner side of the outer side wall 13 of the side beam 1 of this embodiment and the top wall 11. The relationship between the distance L11 between the central axis o of the rivet nut 41 and the outer side of the outer side wall 13, the radius R of the first round chamfer, and the spacing dimension L4 between the central axis o of the rivet nut 41 and the first round chamfer is: L11 = L4 + R + t + 0.75 mm, where t is the wall thickness of the outer side wall 13, and 0.75 mm is the installation tolerance of the central axis o of the rivet nut 41 relative to its own installation point.

[0050] At the same time, as a preferred implementation form, the relationship between the distance L12 between the central axis o of the rivet nut 41 and the outer side of the inner side wall 13 and the flange surface radius r of the rivet nut 41 in this embodiment is: L12=r+8mm+0.75mm, wherein 8mm is the preset sealing distance from the flange surface edge of the rivet nut 41 to the outer side of the inner side wall 13, and 0.75mm is the installation tolerance of the central axis o of the rivet nut 41 relative to its own installation point.

[0051] Moreover, L11 and L12 satisfy the relationship: L11+L12=L1. The installation tolerance of the central axis o of the rivet nut 41 relative to its own installation point is generally 0.75 mm. The preset sealing distance from the edge of the rivet nut 41 to the outside of the inner side wall 13 is preferably 8 mm.

[0052] The advantage of such a setting is that it helps to constrain the position of the rivet nut and constrain L1 to be no less than 25mm, thereby ensuring the sealing effect.

[0053] In addition, in this embodiment, as a preferred implementation form, the reinforcement structure includes a reinforcement flange 212 formed by bending the edge of the connecting flange 21 toward one side of the side beam 1. The arrangement of the reinforcement flange 212 is beneficial to the structural strength of the connecting flange 21, thereby ensuring the structural performance and sealing performance of the entire package.

[0054] The battery pack shell of the present embodiment can provide a sealing strip 3 between the connecting flange 21 and the side beam 1, and provide a reinforcing structure on the connecting flange 21. This can not only utilize the reinforcing structure to enhance the structural strength of the connecting flange 21, thereby eliminating the solution of providing a pressure strip in the traditional battery pack and reducing the use of parts, but also can utilize the connecting flange 21 with high structural strength to enhance the clamping effect of the sealing strip 3, thereby ensuring the sealing performance of the sealing strip 3 between the connecting flange 21 and the side beam 1. This can facilitate cost reduction design while ensuring the sealing performance and structural strength performance of the battery pack shell.

[0055] 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, characterized in that: It comprises a lower shell having side beams, and an upper shell connected to the side beams; The upper shell body is provided with a connecting flange connected to the side beam, and the connecting flange is provided with a reinforcing structure for enhancing its own structural strength, and a sealing strip is provided between the connecting flange and the side beam.

2. The battery pack housing according to claim 1, characterized in that: The top wall of the side beam has a supporting portion extending toward one side of the interior of the lower shell.

3. The battery pack housing according to claim 2, characterized in that: Along the width direction of the side beam, the width dimension L1 of the top wall and the width dimension of the sealing strip are not less than 25 mm.

4. The battery pack housing according to claim 3, characterized in that: The extension dimension L3 of the support portion is between 5-10 mm.

5. The battery pack housing according to claim 2, characterized in that: The connecting flange is connected to the side beam via a fastener.

6. The battery pack housing according to claim 5, characterized in that: The reinforcement structure includes a plurality of reinforcement ribs arranged on the connecting flange.

7. The battery pack housing according to claim 6, characterized in that: The fasteners are multiple and spaced apart along the extending direction of the connecting flange, and the reinforcing ribs are provided between two adjacent fasteners; and / or, Each of the reinforcing ribs is arranged to extend along the extension direction of the connecting flange.

8. The battery pack casing according to claim 5, characterized in that: The fastener is composed of a rivet nut and a bolt.

9. The battery pack casing according to claim 8, characterized in that: The side beam comprises side walls disposed on both sides of the top wall; A first round chamfer is provided between the inner side of the outer side wall and the top wall, and the relationship between the distance L11 between the central axis o of the rivet nut and the outer side of the outer side wall, the radius R of the first round chamfer and the spacing dimension L4 between the central axis o of the rivet nut and the first round chamfer is: L11=L4+R+t+0.75mm, wherein t is the wall thickness of the outer side wall, 0.75mm is the installation tolerance of the central axis o of the rivet nut relative to its own installation point, and / or, the relationship between the distance L12 between the central axis o of the rivet nut and the outer side of the inner side wall and the flange surface radius r of the rivet nut is: L12=r+8mm+0.75mm, wherein 8mm is the preset sealing distance from the flange surface edge of the rivet nut to the outer side of the inner side wall, and 0.75mm is the installation tolerance of the central axis o of the rivet nut relative to its own installation point.

10. The battery pack housing according to any one of claims 1 to 9, characterized in that: The reinforcement structure comprises a reinforcement flange formed by bending the edge of the connecting flange toward one side of the side beam.

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