Battery pack end plate assembly, battery pack and automobile

Abstract

The embodiment of the utility model provides a battery pack end plate assembly, a battery pack and an automobile, and relates to the technical field of battery packs. The battery pack end plate assembly comprises an end plate and a reinforcing plate, the end plate comprises a first plate and a second plate, one end of the second plate is connected with one end of the first plate, the other end of the second plate is connected with the middle position of the first plate, and the first plate and the second plate jointly define a hollow structure. The end plate is provided with the hollow structure, the hollow structure can be used for placing structures such as the liquid cooling plate, the liquid cooling plate is hidden in the hollow structure of the end plate, and the end plate can play a role in bearing and protecting the liquid cooling plate. The reinforcing plate is arranged at the position, where the hollow structure is not formed, of the first plate. By arranging the reinforcing plate, the structural strength of the end plate can be improved.

Description

Technical Field

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

[0002] As a core component of pure electric vehicles, the battery pack's importance is self-evident. First and foremost, its safety is directly related to the safety of passengers and those around them. A battery pack failure, such as a short circuit, overheating, or physical damage, could result in a fire or explosion. Therefore, ensuring the stability and safety of the battery pack in various environments is a top priority in electric vehicle design. Furthermore, the battery pack's capacity and efficiency determine the vehicle's range. A safe battery pack ensures a stable range over the long term. The battery pack's condition also directly impacts key parameters such as acceleration, gradeability, and charging speed. A healthy, efficient battery pack ensures the stability and responsiveness of the vehicle's power output.

[0003] However, current roll-pressed battery packs mostly use movable end plates, and the end plates are mostly profiles or castings, with high unit costs and complex assembly processes. Utility Model Content

[0004] The utility model provides a battery pack end plate assembly, a battery pack and a vehicle, which can protect structures arranged in the end plate, such as a liquid cooling plate, and improve the structural strength of the end plate. In addition, the end plate has a simple structure and is easy to install, which reduces the assembly process of the end plate and reduces the labor cost.

[0005] The embodiment of the present utility model can be implemented as follows:

[0006] An embodiment of the present invention provides a battery pack end plate assembly, comprising:

[0007] an end plate, the end plate comprising a first plate and a second plate, one end of the second plate being connected to one end of the first plate, the other end of the second plate being connected to the middle position of the first plate, the first plate and the second plate together enclosing a hollow structure;

[0008] A reinforcing plate is provided at a position of the first plate where the hollow structure is not formed.

[0009] In an optional embodiment, a plurality of reinforcing ribs are protruded from a side of the reinforcing plate away from the end plate, and the plurality of reinforcing ribs are arranged at intervals.

[0010] In an optional embodiment, there are multiple reinforcing plates, and the multiple reinforcing plates are arranged in parallel.

[0011] An embodiment of the present utility model also provides a battery pack, comprising an upper shell, a lower shell, a battery module and the battery pack end plate assembly described in any of the above embodiments, wherein the upper shell is connected to the lower shell, and the battery module is arranged between the upper shell and the lower shell; the battery pack end plate assembly is arranged in the lower shell, and the battery pack end plate assembly is located at the end of the battery module.

[0012] In an optional embodiment, the battery pack further includes a compression block located between the battery module and the first plate.

[0013] In an optional embodiment, a protrusion is provided at one end of the pressing block away from the lower shell.

[0014] In an optional embodiment, the pressing block is provided with a buckle, and correspondingly, the end plate and the reinforcing plate are both provided with a slot, and the buckle is used to cooperate with the slot.

[0015] In an optional embodiment, the battery module includes multiple rows of battery cells, and the multiple rows of battery cells are arranged in parallel; there are multiple compression blocks, and one compression block is provided at both ends of each row of battery cells.

[0016] In an optional embodiment, the battery pack further includes a liquid cooling plate, which is disposed in the hollow structure.

[0017] An embodiment of the present invention further provides an automobile, comprising a battery pack end plate assembly according to any of the above embodiments or a battery pack according to any of the above embodiments.

[0018] The beneficial effects of the battery pack end plate assembly, battery pack, and automobile according to the embodiments of the present invention include:

[0019] The battery pack end plate assembly includes an end plate and a reinforcement plate. The end plate includes a first plate and a second plate. One end of the second plate is connected to one end of the first plate, and the other end of the second plate is connected to the middle position of the first plate. The first plate and the second plate together enclose a hollow structure. By providing a hollow structure in the end plate, the hollow structure can be used to place structures such as a liquid cooling plate. The liquid cooling plate is hidden in the hollow structure of the end plate. The end plate can play a bearing role and a protective role for the liquid cooling plate. The reinforcement plate is provided at a position where the first plate does not form a hollow structure. By providing a reinforcement plate, the structural strength of the end plate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of a battery pack provided in an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of an explosion of a battery pack provided in an embodiment of the present utility model;

[0023] Figure 3 A schematic diagram of a first viewing angle of a compression block provided in an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a second viewing angle of a compression block provided in an embodiment of the present utility model;

[0025] Figure 5 A schematic diagram of a battery pack end plate assembly provided in an embodiment of the present invention;

[0026] Figure 6 This is an exploded schematic diagram of the battery pack end plate assembly provided in an embodiment of the present invention.

[0027] Icons: 1000-battery pack; 100-battery pack end plate assembly; 110-end plate; 111-first plate; 112-second plate; 113-hollow structure; 114-first slot; 120-reinforcement plate; 121-reinforcement rib; 122-second slot; 200-upper shell; 300-lower shell; 310-"T" beam; 320-"J" beam; 400-battery module; 500-pressing block; 510-protrusion; 520-clip. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0032] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0033] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0034] As a core component of pure electric vehicles, the importance of the battery pack is self-evident. First of all, the safety of the battery pack is directly related to the life safety of passengers and people around them. If the battery pack fails, such as short circuit, overheating or physical damage, it may cause fire or explosion. Therefore, ensuring the stability and safety of the battery pack in various environments is one of the top priorities in electric vehicle design. In addition, the capacity and efficiency of the battery pack determine the endurance of the electric vehicle. A safe battery pack can ensure that the vehicle maintains a stable endurance range during long-term use. The state of the battery pack also directly affects key parameters of the electric vehicle, such as acceleration performance, climbing ability and charging speed. A healthy and efficient battery pack can ensure the stability and response speed of the vehicle's power output. However, the current roll-pressed battery packs mostly use movable end plates, and the end plates are mostly profiles or castings, which have high unit costs and complex assembly processes.

[0035] Based on this, see Figure 1 and Figure 2The battery pack end plate assembly 100 provided in the embodiment of the present invention can effectively improve the technical problems mentioned above. The end plate 110 of the battery pack 1000 can protect the structure provided in the end plate 110, such as the liquid cooling plate, and improve the structural strength of the end plate 110. In addition, the end plate 110 has a simple structure and is easy to install, which reduces the assembly process of the end plate 110 and reduces the labor cost. The battery pack end plate assembly 100 is applied to the battery pack 1000, and the battery pack 1000 can be used in electric vehicles or other electrical equipment. The battery pack 1000, electric vehicles or other electrical equipment having the battery end plate 110 assembly have the same functions as mentioned above, which will not be described in detail here.

[0036] The automobile (not shown in the figure) provided in the embodiment of the present invention includes a vehicle body and a battery pack 1000. The battery pack 1000 is arranged in the vehicle body, and the battery pack 1000 provides electrical energy for the vehicle body to realize various functions of the vehicle body.

[0037] The structure of the battery pack 1000 is described in detail below.

[0038] Figure 1 A schematic diagram of a battery pack 1000 provided in an embodiment of the present invention; Figure 2 This is an exploded diagram of a battery pack 1000 provided in an embodiment of the present invention, as shown in FIG. Figure 1 and Figure 2 As shown, the battery pack 1000 in this embodiment includes an upper shell 200, a lower shell 300, a battery module 400, and a battery pack end plate assembly 100. The upper shell 200 is connected to the lower shell 300, and the battery module 400 is disposed between the upper shell 200 and the lower shell 300. The battery pack end plate assembly 100 is disposed within the lower shell 300 and is located at the end of the battery module 400. In this embodiment, there are two battery pack end plate assemblies 100, which are located at both ends of the battery module 400. The battery pack end plate assembly 100 is first connected to the lower shell 300, and then the battery module 400 is placed in the lower shell 300. The battery module 400 includes multiple rows of battery cells, which are arranged in parallel. The battery pack end plate assemblies 100 are located at both ends of each row of battery cells along the arrangement direction of each row of battery cells. Finally, the upper housing 200 is connected to the lower housing 300 to form a complete battery pack 1000. In this embodiment, the battery pack end plate assembly 100 is welded to the lower housing 300. Of course, the battery pack end plate assembly 100 can also be connected to the lower housing 300 using other connection methods such as threaded fasteners, which are not limited here.

[0039] To facilitate positioning of each row of cells, the lower housing 300 in this embodiment is provided with a plurality of "X"-shaped beams 320. The beams 320 are spaced apart, with the distance between two adjacent "X"-shaped beams 320 being the width of a cell. A row of cells is placed between two adjacent "X"-shaped beams 320.

[0040] In addition, to prevent the battery module 400 from moving in the Z direction, please refer to Figure 2 , and combined with Figure 1 , the battery pack 1000 in this embodiment also includes a plurality of "T"-shaped beams 310. The "T"-shaped beam 310 is arranged between two adjacent rows of battery cells, and the two ends of the "T"-shaped beam 310 are respectively connected to the two battery pack end plate assemblies 100, that is, the two ends of the "T"-shaped beam 310 are respectively connected to the end plates 110 and the reinforcing plates 120 of the two battery pack end plate assemblies 100. And part of the "T"-shaped beam 310 contacts part of the upper end surface of the battery cell to prevent the battery module 400 from moving along the Z direction. Of course, the "T"-shaped beam 310 can also be designed as other shape structures, such as a rectangular parallelepiped, etc., which is not limited here.

[0041] Specifically, the battery cells can be stacked close to the battery pack end plate assembly 100 at one end, and then when they are stacked to the battery pack end plate assembly 100 near the other end and there is less space left, they are pre-extruded through external tooling. The small-size over-extrusion allows the battery cells to be directly placed in the box. After the tooling is removed, the battery cell module rebounds and fits the end plate 110 assembly.

[0042] To simplify the process of installing the battery module 400 into the lower housing 300, please continue to refer to Figure 2 , and combined with Figure 1 The battery pack 1000 in this embodiment also includes a pressing block 500, which is located between the battery module 400 and the first plate 111. In order to place the battery module 400 without the need for external tooling, the battery module 400 is squeezed into the box. In this embodiment, multiple rows of battery cells are stacked into the box, and a gap is left between each row of battery cells and the battery pack end plate assemblies 100 at both ends. The pressing block 500 is placed into the gap from top to bottom, applying a pre-tightening force to the battery module 400, so that the battery module 400 is tightly installed with the lower shell 300. In order to ensure the pre-tightening force of the pressing block 500 on the battery module 400, the width of the gap is less than or equal to the thickness of the pressing block 500. Specifically, in order to facilitate installation, the battery module 400 in this embodiment includes multiple rows of battery cells, and the multiple rows of battery cells are arranged in parallel; the number of pressing blocks 500 is multiple, and a pressing block 500 is provided at both ends of each row of battery cells.

[0043] In order to facilitate the placement of the pressing block 500 into the gap between each row of cells and the battery pack end plate assembly 100, please refer to Figure 3 and Figure 4 , Figure 3A schematic diagram of a first viewing angle of a compression block 500 provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of a second perspective of the compression block 500 provided in an embodiment of the present invention. In this embodiment, a protrusion 510 is provided on the end of the compression block 500 away from the lower housing 300. When the compression block 500 is fully inserted into the gap and contacts the lower housing 300, the protrusion 510 extends beyond the level of the battery module 400. By squeezing the protrusion 510, the compression block 500 is pressed into the gap between each row of battery cells and the battery pack end plate assembly 100.

[0044] Please continue reading Figure 3 and Figure 4 To prevent the compression block 500 from moving in the Z direction, in this embodiment, a buckle 520 is provided on the compression block 500. Correspondingly, both the end plate 110 and the reinforcement plate 120 are provided with a slot, and the buckle 520 is used to cooperate with the slot. Specifically, a first slot 114 is provided on the first plate 111 of the end plate 110, and a second slot 122 is provided on the reinforcement plate 120 at a corresponding position. The buckle 520 engages with the first slot 114 and the second slot 122, thereby securing the position of the compression plate and preventing movement of the compression plate in the Z direction. Of course, the buckle 520 structure can also be provided on the first plate 111 of the end plate 110, and a slot can be provided on the compression block 500 to limit movement of the compression plate in the Z direction. In addition, other structures may also be provided, as long as the pressing block 500 can be easily placed into the gap and can be fixed in position after the pressing block 500 is in close contact with the lower shell 300 and does not move along the Z direction. The specific design of the structure is not limited here.

[0045] To reduce costs, see Figure 4 , and combined with Figure 2 and Figure 1 In this embodiment, the side of the pressing block 500 away from the battery module 400 is designed to be hollow.

[0046] Furthermore, the battery pack 1000 in this embodiment also includes a liquid cooling plate, which is disposed within the hollow structure 113. Placing the liquid cooling plate within the hollow structure 113 of the end plate 110 in the battery pack end plate assembly 100 not only saves space and improves space utilization, but also protects the liquid cooling plate. Furthermore, to secure the liquid cooling plate, the lower housing 300 in this embodiment is provided with a liquid cooling plate bracket. Part of the liquid cooling plate is mounted on the bracket, while the majority of the liquid cooling plate structure is located within the hollow structure 113.

[0047] Of course, a heating element, such as a heating wire or heating plate, or other structural components, such as a wiring harness, can also be disposed within the hollow structure 113 of the end plate 110 in the battery pack end plate assembly 100. This is determined based on practical circumstances and is not limited herein. The hollow structure 113 can protect any structure within the hollow structure 113.

[0048] In addition, the automobile provided in the embodiment of the present invention includes a battery pack end plate assembly 100. The structure of the battery pack 1000 may be different from the battery pack 1000 described above.

[0049] The specific structure of the battery pack end plate assembly 100 will be described in detail below.

[0050] Figure 5 A schematic diagram of a battery pack end plate assembly 100 provided in an embodiment of the present invention; Figure 6 This is an exploded schematic diagram of the battery pack end plate assembly 100 provided in an embodiment of the present invention. Figure 5 and Figure 6 The battery pack end plate assembly 100 in this embodiment includes an end plate 110 and a reinforcing plate 120. The end plate 110 includes a first plate 111 and a second plate 112. One end of the second plate 112 is connected to one end of the first plate 111, and the other end of the second plate 112 is connected to the middle position of the first plate 111. The first plate 111 and the second plate 112 together enclose a hollow structure 113. By providing the hollow structure 113 in the end plate 110, the hollow structure 113 can be used to place liquid cooling plates, heating components such as heating wires and heating plates. The liquid cooling plates and heating components are hidden in the hollow structure 113 of the end plate 110. The end plate 110 can play a bearing role and also play a protective role for the liquid cooling plates. The reinforcing plate 120 is provided at the position of the first plate 111 where the hollow structure 113 is not formed. By providing the reinforcing plate 120, the structural strength of the end plate 110 can be improved. In addition, other structures such as a wiring harness may also be disposed in the hollow structure 113 , which is not limited here.

[0051] Specifically, the second plate 112 in this embodiment is of the "]" shape, that is, the cross-sectional shape of the hollow structure 113 formed by the first plate 111 and the second plate 112 is rectangular. Of course, the cross-sectional shape of the hollow structure 113 formed by the first plate 111 and the second plate 112 can also be other structural shapes such as square and triangle, which are not limited here. In detail, the end plate 110 in this embodiment is a rolled part, which is formed into the first plate 111 and the second plate 112 having the hollow structure 113 after rolling. Of course, the end plate 110 can also adopt other molding processes, such as the first plate 111 and the second plate 112 adopting a welding process, etc., which are not limited here.

[0052] Please continue reading Figure 5 and Figure 6 In this embodiment, the reinforcing plate 120 has multiple reinforcing ribs 121 protruding from the side away from the end plate 110. The multiple reinforcing ribs 121 are arranged at intervals. Because the end plate 110 is generally long, in order to facilitate the installation of the reinforcing plates 120 on the end plate 110, the reinforcing plates 120 in this embodiment are multiple and arranged in parallel.

[0053] For a battery pack 1000 without a buckle 520 structure on the compression block 500, the installation process is as follows:

[0054] First, weld the battery pack end plate assembly 100 to the lower shell 300, and then place the battery module 400, leaving a gap between the battery module 400 and the battery pack end plate assembly 100. Next, press the clamping block 500 into the gap left between the battery module 400 and the battery pack end plate assembly 100 to pre-tighten the battery module 400. After that, connect the "T"-shaped beam 310 to the battery pack end plate assembly 100 to fix the battery module 400. Finally, connect the upper shell 200 to the lower shell 300 to form a complete battery pack 1000.

[0055] For a battery pack 1000 with a buckle 520 structure provided on the compression block 500, the installation process is as follows:

[0056] First, weld the battery pack end plate assembly 100 to the lower shell 300, and then place the battery module 400, leaving a gap between the battery module 400 and the battery pack end plate assembly 100. Next, connect the "T"-shaped beam 310 to the battery pack end plate assembly 100 to secure the battery module 400. Then press the clamping block 500 into the gap left between the battery module 400 and the battery pack end plate assembly 100 to pre-tighten the battery module 400. Finally, connect the upper shell 200 to the lower shell 300 to form a complete battery pack 1000.

[0057] In summary, the battery pack end plate assembly 100 includes an end plate 110 and a reinforcing plate 120. The end plate 110 includes a first plate 111 and a second plate 112. One end of the second plate 112 is connected to one end of the first plate 111, and the other end of the second plate 112 is connected to the middle position of the first plate 111. The first plate 111 and the second plate 112 together enclose a hollow structure 113. By providing the hollow structure 113 on the end plate 110, the hollow structure 113 can be used to place structures such as a liquid cooling plate. The liquid cooling plate is hidden in the hollow structure 113 of the end plate 110. The end plate 110 can play a bearing role and also play a protective role for the liquid cooling plate. The reinforcing plate 120 is provided at a position on the first plate 111 where the hollow structure 113 is not formed. By providing the reinforcing plate 120, the structural strength of the end plate 110 can be improved.

[0058] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack end plate assembly, characterized in that: include: an end plate (110), the end plate (110) comprising a first plate (111) and a second plate (112), one end of the second plate (112) being connected to one end of the first plate (111), the other end of the second plate (112) being connected to a middle position of the first plate (111), the first plate (111) and the second plate (112) jointly enclosing to form a hollow structure (113); A reinforcing plate (120) is provided at a position of the first plate (111) where the hollow structure (113) is not formed.

2. The battery pack end plate assembly according to claim 1, characterized in that: A plurality of reinforcing ribs (121) are protrudingly provided on one side of the reinforcing plate (120) away from the end plate (110), and the plurality of reinforcing ribs (121) are arranged at intervals.

3. The battery pack end plate assembly according to claim 2, characterized in that: There are multiple reinforcing plates (120), and the multiple reinforcing plates (120) are arranged in parallel.

4. A battery pack, characterized in that: The battery pack comprises an upper shell (200), a lower shell (300), a battery module (400) and a battery pack end plate assembly (100) according to any one of claims 1 to 3, wherein the upper shell (200) is connected to the lower shell (300), and the battery module (400) is arranged between the upper shell (200) and the lower shell (300); the battery pack end plate assembly (100) is arranged in the lower shell (300), and the battery pack end plate assembly (100) is located at the end of the battery module (400).

5. The battery pack according to claim 4, characterized in that: The battery pack (1000) further includes a compression block (500), wherein the compression block (500) is located between the battery module (400) and the first plate (111).

6. The battery pack according to claim 5, characterized in that: A protrusion (510) is provided at one end of the pressing block (500) away from the lower shell (300).

7. The battery pack according to claim 5, characterized in that: The pressing block (500) is provided with a buckle (520), and correspondingly, the end plate (110) and the reinforcing plate (120) are both provided with a slot, and the buckle (520) is used to cooperate with the slot.

8. The battery pack according to claim 5, characterized in that: The battery module (400) comprises multiple rows of battery cells, which are arranged in parallel; there are multiple compression blocks (500), with one compression block (500) being provided at both ends of each row of battery cells.

9. The battery pack according to any one of claims 4 to 8, characterized in that: The battery pack (1000) further includes a liquid cooling plate, which is arranged in the hollow structure (113).

10. An automobile, characterized in that: A battery pack end plate assembly (100) comprising any one of claims 1-3 or a battery pack (1000) comprising any one of claims 4-9.

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