Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a lower shell, a BMS (Battery Management System) component arranged in the lower shell, and a maintenance window arranged on the front side wall of the lower shell, a sliding rail assembly is arranged between the BMS component and the lower shell and used for guiding the BMS component to slide into or slide out of the lower shell through the maintenance window in the front-back direction. According to the battery pack disclosed by the utility model, the BMS component can be conveniently disassembled and assembled, and compared with the traditional technology, the whole battery pack does not need to be disassembled, so that the risk of mounting position dislocation caused by deformation of the battery pack and the influence on the use effect of the battery pack when the battery pack is reassembled after overhauling are avoided, and the after-sales maintenance requirement of the battery pack is favorably met.

Description

Technical Field

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

[0002] With the popularization and promotion of the concept of new energy, new energy vehicles have gradually entered thousands of households. The biggest difference between new energy electric vehicles and traditional fuel vehicles is that they use power batteries as power drives. As an important link between battery packs, vehicle systems and motors, the importance of BMS (Battery Management System) is self-evident. BMS collects, processes and stores important information during the operation of the battery pack in real time, exchanges information with external devices such as vehicle controllers, and solves key issues in lithium battery systems such as safety, availability, ease of use, and service life. At present, the BMS hardware of pure electric passenger cars on the market is basically integrated in the battery pack.

[0003] However, when the BMS of the existing battery pack fails and needs to be repaired, the vehicle needs to be lifted with a lift, and then the battery pack needs to be removed. The battery pack is placed on the ground through a tray, and all the screws on the upper cover of the battery pack need to be removed to open the upper cover before the BMS can be taken out. This maintenance method is time-consuming and labor-intensive, and increases maintenance costs.

[0004] In addition, the bottom and cover of the battery pack are made of different materials. After long-term exposure to wind and rain, the removed battery cover will be deformed. During the process of replacing the BMS package, the screw holes may not be aligned and misalignment may occur. As a result, after the battery cover is restored, it will affect the air tightness of the battery pack. The battery pack is prone to slow water seepage, causing the battery to report insulation failure, and in severe cases, it may even cause irreversible rust on the battery cell.

[0005] In addition, the inside of the battery pack needs to be kept clean and dust-free, but dust and foreign objects are easily trapped inside after unpacking. If the air contains metal impurities, it will have other adverse effects on the module cells. Disassembling and assembling the battery pack will also increase the vehicle maintenance cost and other unexpected risks during the disassembly and assembly process. Utility Model Content

[0006] In view of this, the utility model aims to provide a battery pack to improve the convenience of disassembly and assembly of BMS components.

[0007] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0008] A battery pack comprises a lower shell, a BMS component arranged in the lower shell, and a maintenance window arranged on a front side wall of the lower shell;

[0009] A slide rail assembly is provided between the BMS component and the lower housing, and the slide rail assembly is used to guide the BMS component to slide into or out of the lower housing along the front-rear direction and through the maintenance window.

[0010] Furthermore, the slide rail assembly includes a lower slide rail provided on the lower shell body, and an upper slide rail provided on the BMS component; the upper slide rail and the lower slide rail both extend in the front-to-back direction, and the upper slide rail can slide on the lower slide rail in the front-to-back direction.

[0011] Furthermore, the lower sliding rail is arranged on the lower shell through a lower bracket; in the height direction, the lower sliding rail is higher than the bottom edge of the maintenance window.

[0012] Furthermore, the lower slide rail is connected to the lower bracket via self-tapping screws; and / or, a limiting portion is provided at the rear end of the lower bracket, and the limiting portion is used to limit the upper slide rail from moving backwards.

[0013] Furthermore, the BMS component includes an upper bracket, and a BMS assembly arranged on the upper bracket, and the upper slide rail is arranged at the bottom of the upper bracket.

[0014] Furthermore, the upper bracket is provided with a projection welding stud, and the BMS component is connected to the upper bracket via the projection welding stud.

[0015] Furthermore, a detachable maintenance cover is provided on the front side wall, the maintenance cover covers the maintenance window, and the front end of the upper slide rail abuts against the maintenance cover.

[0016] Furthermore, the maintenance cover is screwed to the front side wall.

[0017] Furthermore, a sealing member is provided on the maintenance cover, and the sealing member is used to seal the maintenance window.

[0018] Furthermore, a groove is provided on a side of the maintenance cover facing the maintenance window, the groove and the sealing member both extend along the circumference of the maintenance window, and the sealing member is arranged in the groove.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The battery pack described in the utility model, by providing a maintenance window and a slide rail assembly corresponding to the arrangement of BMS components, can realize convenient disassembly and assembly of the BMS components by only sliding the BMS components out of the maintenance window through the slide rail assembly when inspecting or replacing the BMS. At the same time, compared with the traditional technology, there is no need to disassemble the battery pack as a whole, which can avoid the risk of installation position misalignment caused by deformation of the battery pack when reinstalling the battery pack after inspection, affecting the use effect of the battery pack, thereby helping to meet the after-sales maintenance needs of the battery pack.

[0021] Secondly, the slide rail assembly consists of a lower slide rail and an upper slide rail, and the upper slide rail can slide on the lower slide rail in the front-to-back direction, which is not only conducive to the sliding setting of the BMS components on the lower shell, ensuring the convenience of the pick-up and placement process, but also has a simple structure and is convenient for layout and installation. The setting of the lower bracket is conducive to the arrangement and installation of the lower slide rail, and the lower slide rail is set higher than the bottom edge of the maintenance window, which can avoid the problem of the maintenance window blocking the upper slide rail from sliding in or out along the lower slide rail, ensuring the smoothness of the sliding of the upper slide rail.

[0022] In addition, the lower slide rail is connected to the lower bracket by self-tapping screws, which can save time and improve the connection efficiency while ensuring the connection strength. A limiter is provided at the rear end of the lower bracket to limit the upper slide rail from sliding backward, thereby improving the BMS installation stability and the stability of the battery pack. The setting of the upper bracket makes the arrangement and installation of the upper slide rail on the BMS components more convenient. The use of convex welding studs can improve the convenience and stability of the screw connection between the BMS components and the upper bracket.

[0023] In addition, a removable maintenance cover is provided on the front side wall of the lower shell to ensure the convenience of BMS maintenance or replacement. The maintenance cover is screwed to the front side wall of the lower shell, which not only enables convenient disassembly and assembly of the two, but also ensures the reliability of the connection. By providing a seal, a seal can be formed between the maintenance cover and the maintenance window to reduce dust and foreign matter from falling in, thereby improving the sealing performance of the battery pack. A groove is provided on the side of the maintenance cover facing the maintenance window to facilitate the arrangement and installation of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 This is a schematic diagram of the overall structure of the battery pack according to an embodiment of the utility model;

[0026] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of the maintenance cover plate during assembly according to an embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the lower bracket according to an embodiment of the utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the BMS according to an embodiment of the utility model when it is installed on a battery pack;

[0030] Figure 6 This is a schematic diagram of the structure of the maintenance cover plate according to an embodiment of the utility model;

[0031] Description of reference numerals:

[0032] 1. Lower shell; 11. Front side wall; 111. Maintenance window; 12. Bottom plate; 13. Rear side wall; 14. Left side wall; 15. Right side wall; 16. Crossbeam; 17. Longitudinal beam; 19. Lower bracket; 191. Limiting part;

[0033] 2. Slide rail assembly; 21. Upper slide rail; 211. Upper connecting plate; 212. Sliding member; 22. Lower slide rail; 221. Lower connecting plate; 222. Sleeve;

[0034] 3. BMS components; 31. Upper bracket; 32. BMS components;

[0035] 4. Maintenance cover; 41. Seal;

[0036] 51. Self-tapping screw; 52. Projection welding stud; 53. Bolt; 54. Fixing nut. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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 1The battery pack in the shown state is defined based on the up-down direction (also known as the height direction, or the overall Z direction), the left-right direction (also known as the width direction, or the overall Y direction), and the front-back direction (also known as the length direction, or the overall X direction). "Inside and outside" are defined based on the contour of the corresponding components. For example, "inside" and "outside" are defined based on the position of the BMS, with the side where the BMS is installed being the "inside" and the other side being the "outside".

[0040] 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.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0042] This embodiment relates to a battery pack, which has an overall structure such as Figures 1 to 6 As shown, the battery pack includes a lower shell 1 , a BMS component 3 disposed in the lower shell 1 , and a maintenance window 111 disposed on the front side wall 11 of the lower shell 1 .

[0043] Furthermore, a slide rail assembly 2 is provided between the BMS component 3 and the lower housing 1 , and the slide rail assembly 2 is used to guide the BMS component 3 to slide into or out of the lower housing 1 along the front-rear direction and through the maintenance window 111 .

[0044] Here, a maintenance window 111 and a slide rail assembly 2 are provided corresponding to the arrangement of the BMS component 3. When the BMS component 3 is inspected or replaced, the convenience of taking and placing the BMS component 3 can be improved by sliding the BMS component 3 for taking and placing. At the same time, during the taking and placing process, there is no need to disassemble the entire battery pack, nor to affect other structures of the battery pack, and a better use effect is achieved.

[0045] 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 those skilled in the art. For example, the lower shell 1 includes a bottom plate 12, a rear side wall 13 arranged on the bottom plate 12 and arranged front and rearwardly opposite to the above-mentioned front side wall 11, a left side wall 14 and a right side wall 15 connected between the front side wall 11 and the rear side wall 13, and a cross beam 16 and a longitudinal beam 17 arranged on the bottom plate 12.

[0046] Based on the above overall introduction, in this embodiment, as a preferred implementation form, Figure 2As shown, the slide rail assembly 2 includes a lower slide rail 22 provided on the lower housing 1, and an upper slide rail 21 provided on the BMS component 3. The upper slide rail 21 and the lower slide rail 22 extend in the front-to-back direction, and the upper slide rail 21 can slide on the lower slide rail 22 in the front-to-back direction.

[0047] It can be understood that the slide rail assembly 2 is composed of a lower slide rail 22 and an upper slide rail 21, and the upper slide rail 21 can slide on the lower slide rail 22 in the front-to-back direction, which is not only conducive to the sliding setting of the BMS component 3 on the lower shell 1, ensuring the convenience of the picking and placing process, but also has a simple structure and is conducive to layout and installation.

[0048] In addition, in this embodiment, as a preferred implementation form, the lower lower rail 22 is arranged on the lower shell 1 through the lower bracket 19 to facilitate the arrangement and installation of the lower lower rail 22, and the lower bracket 19 can be fixed to the lower shell 1 by welding, thereby making the lower bracket 19 firmly installed.

[0049] At the same time, in the height direction, the lower slide rail 22 is higher than the bottom edge of the maintenance window 111. The advantage of this arrangement is that the problem of the maintenance window 111 blocking the upper slide rail 21 from sliding in or out along the lower slide rail 22 can be avoided, ensuring the smoothness of the sliding of the upper slide rail 21.

[0050] In addition, as a preferred embodiment, Figure 4 As shown, the lower sliding rail 22 of the present embodiment is connected to the lower bracket 19 by self-tapping screws 51. Specifically, the self-tapping screws 51 can be arranged to be symmetrically distributed on the left and right sides of the lower sliding rail 22, and each side of the lower sliding rail 22 is provided with a plurality of the self-tapping screws 51 arranged at intervals along the front-to-back direction, which can save time and improve the connection work efficiency while ensuring the connection strength.

[0051] Furthermore, as a preferred implementation form, a limit portion 191 is provided at the rear end of the lower bracket 19 of this embodiment, and the limit portion 191 is used to limit the upper slide rail 21 from sliding backward, thereby improving the installation stability of the BMS and the use stability of the battery pack.

[0052] Furthermore, as another preferred embodiment, see Figure 2 and Figure 5 As shown in , the BMS component 3 of this embodiment includes an upper bracket 31 and a BMS assembly 32 arranged on the upper bracket 31, and the upper slide rail 21 is fixed to the bottom of the upper bracket 31 by spot welding.

[0053] Here, the provision of the upper bracket 31 makes the arrangement and installation of the upper slide rail 21 on the BMS component 3 more convenient. At the same time, the spot welding method is used for connection, which can ensure the reliability of the connection between the upper slide rail 21 and the upper bracket 31, and can also reduce material loss and reduce costs.

[0054] It is still worth mentioning that the specific structure of the lower slide rail 22 and the upper slide rail 21 of the present embodiment can be set and adjusted accordingly according to actual sliding requirements. For example, the lower slide rail 22 includes a lower connecting plate 221 arranged on the lower bracket 19, and a sleeve 222 arranged on the lower connecting plate 221.

[0055] The upper slide rail 21 includes an upper connecting plate 211 disposed on the upper bracket 31, and a sliding member 212 disposed on the upper connecting plate 211 and adapted to the sleeve 222. More specifically, the sliding member 212 is generally cylindrical in shape, but based on the requirement of sliding on the sleeve 222, an opening is provided at the bottom thereof, the opening allows the lower sleeve 222 to pass through, and the inner diameter of the sliding member 212 is adapted to the outer diameter of the sleeve 222.

[0056] Continue to see Figure 5 As shown, in this embodiment, as a preferred implementation form, a projection welding stud 52 is provided on the upper bracket 31, and the BMS component 32 is connected to the upper bracket 31 through a fixing nut 54 and the projection welding stud 52, thereby facilitating the convenience and stability of the screw connection between the BMS component 32 and the upper bracket 31.

[0057] In addition, as a preferred implementation form, in this embodiment, a detachable maintenance cover 4 is provided on the front side wall 11 of the lower housing 1, and the maintenance cover 4 is used to cover the maintenance window 111, and the front end of the upper slide rail 21 abuts against the maintenance cover 4. By providing a detachable maintenance cover 4 on the front side wall 11 of the lower housing 1, the convenience of BMS maintenance or replacement can be ensured.

[0058] It is worth mentioning that in the present embodiment, when the BMS assembly 32 and the upper slide rail 21 slide into the lower slide rail 22 through the outside of the maintenance window 111 to be combined, the rear end of the upper slide rail 21 abuts against the limiting portion 191 of the lower bracket 19, and the front end of the upper slide rail 21 abuts against the maintenance cover 4. Thus, after the maintenance cover 4 is fixed, it cooperates with the limiting portion 191 to limit the movement of the BMS component 3 in the front and rear directions, and the slide rail assembly 2 limits the movement of the BMS component 3 in the left and right directions, thereby ensuring the installation stability of the BMS component 3.

[0059] In addition, as a preferred embodiment, see Figure 3 and Figure 6 As shown, in this embodiment, the maintenance cover 4 is connected to the front side wall 11 on the lower shell 1 by bolts 53, and the bolts 53 are distributed along the circumference of the maintenance window 111, which can not only realize the convenient disassembly and assembly of the two, but also ensure the stability of the connection.

[0060] Furthermore, in this embodiment, as a preferred implementation form, a seal 41 is provided on the maintenance cover 4, and the seal 41 is used to seal the maintenance window 111. In this way, a seal can be formed between the maintenance cover 4 and the maintenance window 111, reducing the falling of dust and foreign matter, thereby improving the sealing performance of the battery pack.

[0061] In specific implementation, as a preferred implementation form, a groove is provided on the side of the maintenance cover 4 facing the maintenance window 111 in this embodiment, and the groove and the seal 41 both extend along the circumference of the maintenance window 111, and the seal 41 is embedded in the groove to facilitate the arrangement and installation of the seal 41 while ensuring the installation stability of the seal 41.

[0062] Furthermore, when in use, the sealing member 41 may be a sealing strip product well known to those skilled in the art, and the sealing member 41 abuts against the edge of the maintenance window 111 , which can better enhance the sealing effect and prevent water and dust.

[0063] In this embodiment, it should be noted that the connection terminal of the BMS component 3 needs to face the maintenance window 111. When repairing or disassembling the BMS, by removing the bolts 53 of the maintenance window 111 and removing the maintenance cover 4, the connectors connecting the relevant components inside the battery pack to the BMS can be unplugged from the outside of the maintenance window 111. Then, the BMS component 3 can be taken out through the slide rail assembly 2. After taking out the BMS component 3, the BMS assembly 32 is removed from the upper bracket 31. After the BMS assembly 32 is checked or replaced, the BMS assembly 32 is fixed to the upper bracket 31 again.

[0064] Then, the upper slide rail 21 at the bottom of the upper bracket 31 is placed on the lower slide rail 22 from the maintenance window 111, and pushed along the lower slide rail 22 to the rear end of the lower bracket 19 until the upper slide rail 21 abuts against the limit portion 191, and then the connectors of the relevant components inside the battery pack are inserted back into the BMS assembly 32, and finally the maintenance cover 4 is fastened to the front side wall 11 by bolts 53, thereby stabilizing the installation of the internal BMS components 3. Of course, the various structures of the BMS assembly 32 can refer to existing BMS products, especially the BMS main control board.

[0065] The battery pack involved in the present embodiment, by providing a maintenance window 111 and a slide rail assembly 2 arranged corresponding to the BMS component 3, can realize convenient disassembly and assembly of the BMS component 3 by only sliding the BMS component 3 out of the maintenance window 111 through the slide rail assembly 2 when repairing or replacing the BMS. At the same time, compared with the traditional technology, there is no need to disassemble the battery pack as a whole, which can avoid the risk of installation position misalignment due to deformation of the battery pack when reinstalling the battery pack after repair, affecting the use effect of the battery pack, thereby helping to meet the after-sales maintenance needs of the battery pack.

[0066] 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, characterized in that: It includes a lower housing, a BMS component disposed in the lower housing, and a maintenance window disposed on a front side wall of the lower housing; A slide rail assembly is provided between the BMS component and the lower housing, and the slide rail assembly is used to guide the BMS component to slide into or out of the lower housing along the front-rear direction and through the maintenance window.

2. The battery pack according to claim 1, characterized in that: The slide rail assembly includes a lower slide rail provided on the lower housing, and an upper slide rail provided on the BMS component; The upper slide rail and the lower slide rail both extend in the front-rear direction, and the upper slide rail can slide on the lower slide rail in the front-rear direction.

3. The battery pack according to claim 2, characterized in that: The lower slide rail is arranged on the lower shell through a lower bracket; In the height direction, the lower sliding rail is higher than the bottom edge of the maintenance window.

4. The battery pack according to claim 3, characterized in that: The lower slide rail is connected to the lower bracket by self-tapping screws; and / or, A limiting portion is provided at the rear end of the lower bracket, and the limiting portion is used to limit the upper slide rail from moving backward.

5. The battery pack according to claim 2, characterized in that: The BMS component includes an upper bracket and a BMS assembly arranged on the upper bracket, and the upper slide rail is arranged at the bottom of the upper bracket.

6. The battery pack according to claim 5, characterized in that: The upper bracket is provided with projection welding studs, and the BMS component is connected to the upper bracket via the projection welding studs.

7. The battery pack according to any one of claims 2 to 6, characterized in that: The front side wall is provided with a detachable maintenance cover, the maintenance cover covers the maintenance window, and the front end of the upper slide rail abuts against the maintenance cover.

8. The battery pack according to claim 7, characterized in that: The maintenance cover is screwed to the front side wall.

9. The battery pack according to claim 7, characterized in that: The maintenance cover is provided with a sealing member, and the sealing member is used for sealing the maintenance window.

10. The battery pack according to claim 9, characterized in that: A groove is provided on one side of the maintenance cover plate facing the maintenance window. Both the groove and the sealing member extend along the circumference of the maintenance window, and the sealing member is arranged in the groove.

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