Battery pack

Abstract

The utility model provides a battery pack, which belongs to the technical field of battery packs, and comprises a lower box body, a battery assembly and a first fixing piece, the lower box body comprises a plurality of frames, a containing cavity is limited among the frames, and the frames are provided with connecting end faces used for being connected with an upper box body; the battery assembly is arranged in the accommodating cavity, and the connecting end face of the frame parallel to the first direction is a first connecting end face; the first fixing piece comprises a first pressing plate and a first connecting plate, the first pressing plate and the first connecting plate are both arranged in parallel with the first direction, the first pressing plate is arranged on the battery assembly in a pressing mode, and the first connecting plate is detachably connected with the first connecting end face. The first connecting end face on the lower box body is used for fixing the battery assembly by the first fixing piece, so that the battery assembly is convenient to disassemble, an extra space is not required to be occupied in the box body to arrange a bearing part, the space utilization rate of the box body is improved, and the energy density of the battery is improved to the maximum extent under the condition of the same size of the box body.

Description

Technical Field

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

[0002] The CTP (cell to pack) solution integrates batteries directly into the battery pack, eliminating the intermediate module link, improving space utilization and reducing battery pack costs.

[0003] For battery packs using the CTP solution, due to the lack of the traditional battery module end and side plate structure, in order to strengthen the fixing strength of the battery assembly in the battery pack case, the battery assembly is often pressed and fixed in the case by using fixing parts. In the prior art, the fixing parts used to fix the battery assembly close to the case frame are often connected to the receiving part adjacent to the frame. The receiving part can be the side beam inside the case or a step surface formed by the frame.

[0004] In the above-mentioned prior art, due to the setting of the receiving portion, it is necessary to occupy part of the space in the battery pack box, resulting in limited installation space for the battery assembly, which is not conducive to improving the energy density of the battery pack. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that an additional receiving portion needs to be set up in the battery pack for connecting the fixing parts, resulting in the receiving portion occupying the space in the battery pack and reducing the space utilization, thereby providing a battery pack.

[0006] In order to solve the above technical problems, the present invention provides a battery pack, comprising:

[0007] The lower box body includes a plurality of frames, wherein a receiving cavity is defined between the frames, and the frames have a connecting end surface for connecting with the upper box body;

[0008] A battery assembly is disposed in the accommodating cavity, wherein a connection end surface of the frame parallel to the first direction is a first connection end surface;

[0009] The first fixing member includes a first pressing plate and a first connecting plate. The first pressing plate and the first connecting plate are both arranged parallel to the first direction. The first pressing plate is pressed on the battery assembly. The first connecting plate is detachably connected to the first connecting end surface.

[0010] Optionally, the first connecting end surface is divided into at least a first area and a second area, the first connecting plate is arranged in the first area, and the end surface of the upper box body is arranged in the second area.

[0011] Optionally, the second area includes a third area and a fourth area, the third area is provided with a sealing member, and the fourth area is used to be connected to the upper box body.

[0012] Optionally, the sealing element is a concave-convex tooth-shaped structure.

[0013] Optionally, the third area is formed between a first side of the first area close to the third area and a second side of the fourth area close to the third area;

[0014] The first side and the second side are both concave-convex tooth-shaped structures, and the first side and the second side that are opposite to each other can mesh with each other.

[0015] Optionally, the upper box body has a second connection end surface for connecting to the lower box body, and the second connection end surface is adapted to the structure of the second area; the first connection plate is adapted to the structure of the first area.

[0016] Optionally, a first connection hole is provided on the protrusion of the first region, and the first connection hole is connected to the first connection plate; a second connection hole is provided on the protrusion of the fourth region, and the second connection hole is connected to the second connection end surface.

[0017] Optionally, it further includes: a second fixing member, the second fixing member includes a second connecting plate and two second pressing plates, the second fixing member is arranged between two adjacent battery assemblies, and the two second pressing plates are respectively pressed against the two adjacent battery assemblies.

[0018] Optionally, a fixed beam is provided between two adjacent battery assemblies, and the second connecting plate is detachably connected to the fixed beam.

[0019] Optionally, the battery assembly includes a plurality of battery cells arranged in sequence, and a buffer is provided between two adjacent battery cells.

[0020] The technical solution of this utility model has the following advantages:

[0021] The battery pack provided by the utility model includes a lower box, a battery assembly and a first fixing member. The lower box includes a plurality of frames, and a receiving cavity is defined between the frames. The frames have a connecting end surface for connecting with the upper box. The battery assembly is arranged in the receiving cavity. The connecting end surface of the frame parallel to the first direction is the first connecting end surface. The first fixing member includes a first pressing plate and a first connecting plate. The first pressing plate is pressed on the battery assembly, and the first connecting plate is detachably connected to the first connecting end surface.

[0022] The first fixing part fixes the battery assembly by utilizing the first connecting end face on the lower box body, which not only facilitates the disassembly of the battery assembly, but also does not require additional space in the box body to set up a receiving part, thereby improving the space utilization rate of the box body. The connection between the first connecting plate and the first connecting end face has better pressing stability for the battery assembly, and under the condition of the same box size, it can maximize the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the specific implementation methods of the present invention, the following will briefly introduce the drawings required for use in the description of the specific implementation methods. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of an exploded structure of an embodiment of the battery pack provided in Example 1 of the present utility model;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of a battery pack;

[0026] Figure 3 for Figure 2 A local enlarged schematic diagram in FIG.

[0027] Figure 4 for Figure 1 A schematic diagram of a partial structure of the first fixing member in FIG;

[0028] Figure 5 for Figure 1 A schematic top view of the first connecting end face of the frame;

[0029] Figure 6 for Figure 1 Schematic diagram of the partial structure of the second fixing member.

[0030] Description of reference numerals:

[0031] 1. Frame; 2. Accommodation cavity; 3. First connection end face; 4. Battery assembly; 5. First fixing member; 6. First pressure plate; 7. First connecting plate; 8. First area; 9. Second area; 10. First side; 11. Second side; 12. First connecting hole; 13. Second connecting hole; 14. Third area; 15. Sealing member; 16. Second fixing member; 17. Second connecting plate; 18. Second pressure plate; 19. Buffer member; 20. First vertical plate; 21. Fourth area; 22. Battery cell. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] The battery pack provided in this embodiment fixes the battery assembly by means of the first fixing member and the second fixing member, which facilitates the disassembly and replacement of the battery assembly compared to the traditional bonding method.

[0037] like Figures 1 to 4 The figure shows a specific implementation of the battery pack provided in this embodiment, including a lower case, a battery assembly 4, and a first fixing member 5. The lower case includes multiple frames 1, which define a storage cavity 2 between the frames 1. The frames 1 have a connection end surface for connecting to the upper case. The battery assembly 4 is disposed in the storage cavity 2, wherein the connection end surface of the frame 1 parallel to the first direction is the first connection end surface 3. The first fixing member 5 includes a first pressing plate 6 and a first connecting plate 7. Both the first pressing plate 6 and the first connecting plate 7 are arranged parallel to the first direction. The first pressing plate 6 is pressed onto the battery assembly 4, and the first connecting plate 7 is detachably connected to the first connection end surface 3. The upper case is not shown in the figure.

[0038] The first fixing part 5 fixes the battery assembly 4 by utilizing the first connecting end face 3 on the lower box body, which not only facilitates the disassembly of the battery assembly 4, but also does not require additional space in the box body to set up a receiving part, thereby improving the space utilization rate of the box body. The connection between the first connecting plate 7 and the first connecting end face 3 has better pressing stability for the battery assembly 4, and under the condition of the same box size, it can maximize the energy density of the battery pack.

[0039] Specifically, the first fixing member 5 fixes the side of the battery assembly 4 close to the frame 1. Generally, only the battery assembly 4 close to the frame 1 needs to use the first fixing member 5, while the battery assembly 4 located in the middle needs to use the second fixing member 16 mentioned later; the first pressure plate 6 and the first connecting plate 7 cooperate to apply an overall downward pressing force to the battery assembly 4 to fix the battery assembly 4. When disassembly is required, it is only necessary to separate the first connecting plate 7 and the first connecting end face 3, and then take out the faulty battery assembly 4 for replacement. The operation is convenient and quick.

[0040] A specific implementation of the first fixing member 5 is as follows: Figure 4 As shown, the horizontally arranged first pressure plate 6 and the first connecting plate 7 are connected by a vertically arranged first vertical plate 20. The first vertical plate 20 can directly contact the side of the battery assembly 4 or contact the liquid cooling plate on the battery assembly 4. In this embodiment, the top surface of the battery assembly 4 is higher than the first connecting end surface 3. In the third direction, the first pressure plate 6 is arranged higher than the first connecting plate 7. The material of the first fixing member 5 is not limited and can be steel, aluminum, plastic or other materials.

[0041] In addition, as an alternative embodiment, the top surface of the battery assembly 4 is lower than the first connection end surface 3 , and the first pressing plate 6 is arranged lower than the first connecting plate 7 .

[0042] In addition, in another alternative embodiment, the top surface of the battery assembly 4 is flush with the first connection end surface 3, and the first riser 20 is not required, and the first pressing plate 6 and the first connecting plate 7 are directly connected.

[0043] There are multiple battery assemblies 4, which are arranged in sequence along the second direction. The first fixing member 5 is arranged along the first direction to press the length side of the battery assembly 4 in the first direction to ensure the stability of the battery assembly 4.

[0044] like Figure 5 As shown, in the battery pack provided in this embodiment, the first connection end surface 3 is divided into at least a first area 8 and a second area 9 , the first connection plate 7 is arranged in the first area 8 , and the end surface of the upper box body is arranged in the second area 9 .

[0045] The first connecting end face 3 is connected to the first connecting plate 7 and the upper box body at the same time. The division of the first area 8 and the second area 9 facilitates the rapid positioning and connection of the first connecting plate 7 and the upper box body with the first connecting end face, and the two areas are divided along the second direction, that is, when the upper box body is removed, it will not affect the fixation of the first fixing member 5.

[0046] The first direction is Figure 1 The middle X direction, the second direction is Figure 1 The middle Y direction, the third direction is Figure 1 Middle Z direction.

[0047] like Figure 3 and 5 As shown, the second region 9 includes a third region 14 and a fourth region 21. The third region 14 is provided with a seal 15, and the fourth region 21 is used to connect to the upper case. The provision of the seal 15 ensures the sealing performance of the connection interface between the upper and lower cases of the battery pack. Specifically, the seal 15 is a sealing foam, and the shape and size of the seal 15 are adapted to the structure of the third region 14, making the structure more compact.

[0048] The fourth area 21 is used to connect with the end face of the upper box body, and the third area 14 is used to set the seal 15. The seal 15 is pressed by the end face of the upper box body and the first connecting end face 3 of the lower box body to achieve sealing. This design jointly ensures the sealing effect and connection stability.

[0049] In other embodiments, the second area 9 is not divided into the third area 14 and the fourth area 21, and the sealing member 15 is laid in the second area 9. Preferably, the sealing member 15 is entirely arranged in the second area 9, and holes are opened to avoid the places where the upper box needs to be connected.

[0050] like Figure 3 As shown, in the battery pack provided by this embodiment, the seal 15 is a concave-convex tooth-shaped structure. Since the first area 8 of the first connecting end face 3 is occupied by the first fixing member 5, and the fourth area 21 is used to connect with the end face of the upper box body, the space that can be occupied by the seal in a straight-line extension form is limited. By setting the concave-convex tooth-shaped structure of the seal 15, the sealing is maximized when the size of the first connecting end face 3 is limited, and the sealing effect is better.

[0051] In a specific embodiment, the sealing member 15 has a wave-shaped structure. After installation, the upper box body is pressed onto the sealing member 15 to achieve a sealing effect.

[0052] like Figure 5As shown, in the battery pack provided in this embodiment, a third area 14 is formed between the first side 10 of the first area 8 close to the third area 14 and the second side 11 of the fourth area 21 close to the third area 14; the first side 10 and the second side 11 are both concave-convex tooth structures, and the oppositely arranged first side 10 and second side 11 can engage with each other.

[0053] The first side 10 and the second side 11 are arranged as a concave-convex tooth structure, and the first side 10 and the second side 11 can engage with each other, so that the first connecting end face 3 can be used more compactly without setting the first connecting end face 3 to be wider to accommodate the first connecting plate 7 and the upper box body.

[0054] It should be noted that the specific shape of the concave-convex tooth structure is not limited, and it can be a wavy structure, a rectangular tooth structure, a triangular tooth structure, etc., preferably a wavy structure.

[0055] The battery pack provided in this embodiment has an upper case with a second connection end surface for connecting to the lower case. The second connection end surface is adapted to the structure of the second region 9; the first connection plate 7 is adapted to the structure of the first region 8. The second connection end surface and the first connection plate 7 are located in the first region 8 and the second region 9, respectively, and each structure is adapted to its corresponding region. The structure is compact and does not interfere with each other, facilitating subsequent connections.

[0056] like Figure 5 As shown, in the battery pack provided in this embodiment, a first connection hole 12 is provided on the protrusion of the first area 8, and the first connection hole 12 is connected to the first connection plate 7; a second connection hole 13 is provided on the protrusion of the fourth area 21, and the second connection hole 13 is connected to the second connection end surface.

[0057] By providing the first connection hole 12 and the second connection hole 13 on the protrusions of the first area 8 and the fourth area 21 respectively, the space and strength required for the connection are ensured without occupying a large space.

[0058] In other embodiments, the first side 10 and the second side 11 are straight lines parallel to each other.

[0059] like Figure 1 and Figure 6 As shown, the battery pack provided in this embodiment also includes: a second fixing member 16, the second fixing member 16 includes a second connecting plate 17 and two second pressure plates 18, the second fixing member 16 is arranged between two adjacent battery assemblies 4, and the two second pressure plates 18 are respectively pressed against the two adjacent battery assemblies 4; a fixing beam is arranged between two adjacent battery assemblies 4, and the second connecting plate 17 is detachably connected to the fixing beam.

[0060] The second fixing member 16 is provided to simultaneously press two adjacent battery assemblies 4 , saving components and space. The first fixing member 5 and the second fixing member 16 cooperate to ensure the stability of the battery assembly 4 inside the box.

[0061] Specifically, the second fixing member 16 is an X-shaped structure, the middle horizontal plate of the structure is the second connecting plate 17, the second connecting plate 17 is connected to the conventional fixed beam arranged in the lower box body, and the two horizontal plates on both sides of the lower part are the second pressing plates 18.

[0062] In addition, as an alternative embodiment, the second fixing member 16 can be a split structure, that is, two Z-shaped structures, which can respectively press two adjacent battery assemblies 4.

[0063] like Figure 1 As shown, the battery pack provided in this embodiment, the battery assembly 4 includes a plurality of battery cells 22 arranged in sequence, and a buffer member 19 is provided between two adjacent battery cells 22. Specifically, the buffer member 19 is a buffer foam, which provides a smooth and long-lasting rebound force for the battery, can accommodate thermal expansion and contraction between batteries, and meet long-term application needs.

[0064] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: include: The lower box body comprises a plurality of frames (1), wherein a receiving cavity (2) is defined between the frames (1), and the frames (1) have a connection end surface for connecting with the upper box body; A battery assembly (4) is arranged in the accommodating cavity (2), wherein the connection end surface of the frame (1) parallel to the first direction is a first connection end surface (3); The first fixing member (5) comprises a first pressing plate (6) and a first connecting plate (7), wherein the first pressing plate (6) and the first connecting plate (7) are both arranged parallel to the first direction, the first pressing plate (6) is pressed onto the battery assembly (4), and the first connecting plate (7) is detachably connected to the first connecting end surface (3).

2. The battery pack according to claim 1, wherein: The first connecting end surface (3) is divided into at least a first area (8) and a second area (9); the first connecting plate (7) is arranged in the first area (8), and the end surface of the upper box body is arranged in the second area (9).

3. The battery pack according to claim 2, wherein: The second area (9) includes a third area (14) and a fourth area (21), wherein a sealing member (15) is provided in the third area (14), and the fourth area (21) is used for connecting with the upper box body; or, a sealing member (15) is laid in the second area (9).

4. The battery pack according to claim 3, wherein: The sealing member (15) is a concave-convex tooth-shaped structure.

5. The battery pack according to claim 4, characterized in that: The third region (14) is formed between the first side edge (10) of the first region (8) close to the third region (14) and the second side edge (11) of the fourth region (21) close to the third region (14); The first side edge (10) and the second side edge (11) are both concave-convex tooth-shaped structures, and the first side edge (10) and the second side edge (11) arranged opposite to each other can mesh with each other.

6. The battery pack according to claim 5, characterized in that: The upper box body has a second connection end face for connecting with the lower box body, and the second connection end face is adapted to the structure of the second area (9); the first connection plate (7) is adapted to the structure of the first area (8).

7. The battery pack according to claim 6, characterized in that: A first connection hole (12) is provided on the protrusion of the first area (8), and the first connection hole (12) is connected to the first connection plate (7); a second connection hole (13) is provided on the protrusion of the fourth area (21), and the second connection hole (13) is connected to the second connection end surface.

8. The battery pack according to claim 1, wherein: Also includes: A second fixing member (16), the second fixing member (16) comprises a second connecting plate (17) and two second pressing plates (18), the second fixing member (16) is arranged between two adjacent battery assemblies (4), and the two second pressing plates (18) are respectively pressed against the two adjacent battery assemblies (4).

9. The battery pack according to claim 8, characterized in that: A fixed beam is provided between two adjacent battery assemblies (4), and the second connecting plate (17) is detachably connected to the fixed beam.

10. The battery pack according to any one of claims 1 to 9, characterized in that: The battery assembly (4) comprises a plurality of battery cells (22) arranged in sequence, and a buffer (19) is provided between two adjacent battery cells (22).

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