CTB battery pack structure with upside-down mounted battery cells

Abstract

The utility model discloses a CTB battery pack structure with an inverted battery cell, and relates to the field of new energy automobiles, the battery pack structure is installed on a frame at the bottom of an automobile body, an automobile body floor on the frame serves as an upper shell of the battery pack, the battery pack structure comprises the battery cell, a sealing plate and a limiting structure, the battery cell is installed at the bottom of the frame in an inverted mode, and the sealing plate is arranged on the battery cell. The limiting structure is installed between a vehicle body floor and the sealing plate and used for fixing the battery cell, the sealing plate is installed below the battery cell, an isolation gap is reserved between the sealing plate and the battery cell, a weakening structure used for improving the safety of the battery pack is arranged on the sealing plate, an anti-explosion valve of the battery cell faces the sealing plate, the position of the anti-explosion valve corresponds to that of the weakening structure, and the thickness of the weakening structure is smaller than that of the sealing plate. After the explosion-proof valve is released, the weakening structure can be damaged in advance, so that heat is quickly discharged from the damaged part; according to the technical scheme, the grouping efficiency of the CTB battery pack structure can be maintained, meanwhile, the height occupied space of a vehicle body is reduced, the battery pack structure and the assembling technology are simplified, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the field of new energy vehicles, and in particular to a CTB battery pack structure with inverted battery cells. Background Art

[0002] CTB battery body integration technology (Cell To Body) is a technology that directly integrates batteries into the vehicle body structure. Through process structure innovation and optimization, the battery pack and chassis are integrated, allowing the battery pack to directly become a part of the body structure. There are two common forms of integrating the body and battery pack using this technology. The first is to retain the upper shell of the battery pack, remove the body floor, and install the battery pack directly on the body chassis, using the upper shell of the battery pack as the body floor. Among them, the battery cell layout in the battery pack often adopts the CTP1.0 solution or the BYD seal solution. The second is to remove the upper shell of the battery pack, use the body floor as the upper shell of the battery pack, and install the lower shell of the battery pack on the body. The battery cell layout in the battery pack is like the Leapmotor CTB solution.

[0003] In the above two common forms, the battery cells in the battery pack are generally placed upright, and the battery cells are installed at the bottom of the lower shell of the battery pack, that is, the top of the battery cell is facing up (the positive and negative electrode areas of the battery cell are located at the top), and the bottom is installed downward, and the bottom of the battery cell is fixed to the bottom of the battery pack shell. When the battery cell is installed as a whole at the bottom of the battery pack shell, the battery cell is more vulnerable to impact or scratches. In order to protect the battery cell, it is also necessary to set an anti-ball impact structure under the battery pack, which will increase the overall height of the battery pack, and an electrical insulation gap is also required above the battery cell, resulting in insufficient margin of the vehicle body size in the vertical direction, which leads to compression of the space inside the vehicle or insufficient ground clearance under the vehicle, increasing the risk of scratching the bottom during the movement of the car. Moreover, when the battery cell is placed upright, the water cooling plate is set at the bottom of the battery pack, which requires a high strength of the water cooling plate structure. In addition, the electrical connectors and explosion-proof valves in the battery pack are connected to the top of the battery cell, and the heat dissipation direction is top or side. The heat dissipation channel is tortuous, the path is too long, and it is close to the passenger compartment. After thermal runaway, the heat spreads directly into the car through the car body floor. This results in the heat not being directly unblocked, the battery pack cannot quickly dissipate heat, and the heat expands and spreads, increasing the risk of use. The battery pack in the prior art has a complex structure, many parts and high cost, and the assembly process on the car body is also relatively complex. Therefore, a new battery pack structure is needed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to improve the battery pack structure in the prior art and provide a CTB battery pack structure with inverted cells to solve the problems of insufficient vertical dimension margin, complicated installation process and untimely heat dissipation when installing the battery pack, further reduce the risk of bottom scraping during vehicle driving and the risk of heat spread during thermal runaway, and improve safety of use.

[0005] The technical solution of the utility model is: to provide a CTB battery pack structure with an inverted battery cell, which is installed on a frame at the bottom of the vehicle body, and the CTB battery pack structure with an inverted battery cell includes a battery cell, a sealing plate and a limiting structure;

[0006] The battery cell is installed in an inverted manner at the bottom of the frame, the limiting structure is installed at the bottom of the frame and connected to the battery cell, and the sealing plate is installed at the bottom of the frame and below the battery cell, with a gap between the sealing plate and the battery cell;

[0007] A weakening structure is provided on the sealing plate to improve the safety of the battery pack.

[0008] Furthermore, the vehicle frame includes a vehicle body floor, and one end of the battery cell where no positive or negative poles are arranged is adhesively connected to the vehicle body floor.

[0009] Furthermore, the weakening structure is a blind hole structure symmetrically arranged on both sides of the sealing plate.

[0010] Furthermore, an explosion-proof valve is provided at one end of the battery cell that is not connected to the vehicle body floor, and the position of the weakened structure corresponds to the position of the explosion-proof valve.

[0011] Furthermore, the thickness of the sealing plate is 3 to 4 mm, and the thickness of the weakened structure is 1 to 1.5 mm less than the thickness of the sealing plate.

[0012] Furthermore, the limiting structure is located between the vehicle body floor and the cover plate, and the limiting structure is adhesively connected to the battery cell to fix the battery cell.

[0013] Furthermore, the limiting structure includes a first limiting plate and a second limiting plate, and the first limiting plate is connected to the second limiting plate.

[0014] Furthermore, the first limiting plate is connected to the frame. There are two first limiting plates, which are respectively installed on a side of the battery cell close to the front end of the frame and a side of the battery cell close to the rear end of the frame. The first limiting plate is adhesively connected to the battery cell.

[0015] Furthermore, a battery pack consisting of battery cells is arranged in the battery core, and the second limiting plate is installed between the battery packs of the battery core and is adhesively connected to the battery packs.

[0016] The beneficial effects of the utility model are:

[0017] The technical solution of the utility model installs the battery cell upside down at the bottom of the vehicle body, sets a limiting structure to reinforce the battery cell, and replaces the lower shell of the traditional battery pack with a sealing plate with a weakened structure. It can reduce the space occupied by the vehicle body height while maintaining the grouping efficiency of the CTB battery pack structure, simplify the battery pack structure and assembly process, and increase the safety of the battery pack, which is specifically reflected in the following aspects:

[0018] (1) The battery cell is installed upside down at the bottom of the vehicle body. The electrical insulation gap of the battery pack is set below the battery cell. This gap can not only form electrical insulation but also serve as a safety distance to prevent the battery cell from being scratched. In this way, the anti-ball impact structure set at the bottom of the lower shell in the traditional battery pack is eliminated, which reduces the body height by 10 to 15 mm in the vertical direction and reduces the space occupied by the body height. At the same time, the inverted installation method can reduce the pressure on the lower shell of the battery pack. There is no need to add other additional support structures to the bottom of the battery pack to bear the weight of the battery cell, which increases the distance between the bottom of the vehicle and the ground, further reducing the risk of vehicle bottom scratching.

[0019] (2) A weakened structure corresponding to the explosion-proof valve on the battery cell is provided on the sealing plate, which can be destroyed first after the explosion-proof valve is released, so as to achieve the effect of quickly discharging heat through the damaged part of the weakened structure after thermal runaway. In the prior art, the heat dissipation path of the battery pack is long and tortuous, and the heat cannot be discharged in time. The technical solution of the utility model is to discharge heat from the bottom in a faster and more direct way, with a short heat dissipation path, which can effectively control the spread of heat and improve the safety of the vehicle.

[0020] (3) The lower shell of the traditional battery pack is replaced by a sealing plate, which eliminates the ball-impact protection structure provided at the bottom of the lower shell of the traditional battery pack, reduces the battery pack parts, simplifies the battery pack structure and assembly process, and reduces the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The advantages of the above and / or additional aspects of the present invention will become apparent and easily understood in the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 This is an exploded view of a CTB battery pack structure with inverted cells according to an embodiment of the utility model;

[0023] Figure 2 It is a structural schematic diagram of a frame according to an embodiment of the utility model;

[0024] Figure 3 It is a side cross-sectional view of a CTB battery pack structure with inverted cells according to an embodiment of the utility model;

[0025] Figure 4 is based on Figure 3 A partial enlarged view of the middle part of the side cross-sectional view of the battery pack structure;

[0026] Figure 5 is based on Figure 1 A partial enlarged view of the lower right part of the exploded view of the battery pack structure;

[0027] Figure 6 This is a bottom view of a CTB battery pack structure with inverted cells according to an embodiment of the utility model;

[0028] Figure 7 It is a structural schematic diagram of a limiting structure according to an embodiment of the utility model;

[0029] Figure 8 is based on Figure 7 A partial enlarged view of the middle limit structure;

[0030] Fig. 9 It is a schematic diagram of a battery cell invertedly mounted on a vehicle frame according to an embodiment of the utility model.

[0031] Among them, 1-battery cell, 101-explosion-proof valve, 102-positive and negative electrodes, 2-sealing plate, 201-weakening structure, 3-limiting structure, 301-first limiting plate, 302-second limiting plate, 4-gap, 5-frame, 501-body floor. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0033] In the following description, many specific details are elaborated to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0034] like Figure 1 , Figure 2 As shown, this embodiment provides a CTB battery pack structure with inverted cells, which is installed on a frame 5 at the bottom of the CTB body. The CTB battery pack structure with inverted cells includes a cell 1, a sealing plate 2 and a limiting structure 3.

[0035] The battery cell 1 is installed in an inverted manner at the bottom of the frame 5, and the limiting structure 3 is installed at the bottom of the frame 5, at a position for limiting the battery cell 1. The limiting structure 3 is located between the frame 5 and the sealing plate 2, and is adhesively connected to the battery cell 1. The sealing plate 2 is installed at the bottom of the frame 5, below the battery cell 1, and a gap is left between the sealing plate 2 and the battery cell 1.

[0036] In this embodiment, taking the normal parking or driving state of the automobile as a reference, the vertically upward direction is the upper side, and the vertically downward direction is the lower side.

[0037] like Figures 3 to 6As shown, an explosion-proof valve 101 and positive and negative electrodes 102 are provided at one end of the battery cell 1, and this end is used as the top end and the other end is used as the bottom end. The battery cell 1 is installed at the bottom of the frame 5 in an inverted manner, that is, the battery cell 1 is installed at the bottom of the frame 5 with the top end facing downward and the bottom end facing upward, wherein the explosion-proof valve 101 and the positive and negative electrodes 102 are both facing downward.

[0038] The vehicle frame 5 includes a vehicle body floor 501 , and one end of the battery cell 1 where the positive and negative electrodes 102 are not provided is adhesively connected to the vehicle body floor 501 , that is, the battery cell 1 is installed on the vehicle body floor 501 in an inverted manner.

[0039] In this embodiment, the CTB battery pack structure with inverted cells uses the vehicle body floor 501 as the upper shell of the battery pack. The vehicle body floor 501 is located in the middle of the frame 5 and is integrally formed with the frame 5.

[0040] The vehicle body floor 501 is integrated with a liquid cooling component for dissipating heat for the battery pack. The surface of one side of the vehicle body floor 501 for mounting the battery cell 1 is flat and can effectively contact the battery cell 1 to achieve thermal management.

[0041] The sealing plate 2 is installed at the bottom of the frame 5 and below the battery cell 1. The sealing plate 2 is connected to the frame 5 and seals the battery safety cavity, wherein a cavity for accommodating the battery cell 1 is formed between the vehicle body floor 501 and the sealing plate 2. A gap 4 is left between the battery cell 1 and the sealing plate 2. The function of the gap 4 is to form an electrical insulation gap to maintain good electrical insulation. At the same time, the gap 4 can also form a buffer space to prevent the battery cell 1 from being scratched and leave a safety distance, which is conducive to heat dissipation and preventing the battery cell 1 from being damaged.

[0042] A weakened structure 201 corresponding to the explosion-proof valve 101 is arranged on the sealing plate 2. The weakened structure 201 is a blind hole structure symmetrically arranged on both sides of the sealing plate 2. The thickness of the sealing plate 2 is 3 to 4 mm. The thickness of the weakened structure 201 is 1 to 1.5 mm less than the thickness of the sealing plate 2, that is, the thickness of the weakened structure 201 is 1 to 1.5 mm thinner than the thickness of other parts of the sealing plate 2.

[0043] The position of the weakened structure 201 on the sealing plate 2 corresponds to the position of the explosion-proof valve 101. The weakened structure 201 is used to improve the safety of the battery pack structure. The weakened structure 201 can be destroyed first after the explosion-proof valve 101 is released, so as to achieve the effect of quickly discharging heat through the destroyed part of the weakened structure 201 after thermal runaway, thereby controlling heat spread.

[0044] In this embodiment, the sealing plate 2 serves as the lower shell of the CTB battery pack structure, and can protect the battery cell 1 from being damaged by road gravel and other debris during the driving of the vehicle.

[0045] like Figures 7 to 9As shown, the limiting structure 3 is installed inside the CTB battery pack structure to clamp the battery cell 1 and keep the position of the battery cell 1 fixed to prevent the battery cell from moving or colliding during transportation or vibration, thereby increasing the safety and stability of the battery cell 1 structure.

[0046] The limiting structure 3 is located between the vehicle body floor 501 and the sealing plate 2 . The limiting structure 3 includes a first limiting plate 301 and a second limiting plate 302 . The first limiting plate 301 and the second limiting plate 302 are threadedly connected.

[0047] The first limiting plate 301 is threadedly connected to the frame 5 . There are two first limiting plates 301 , which are respectively installed on one side of the battery cell 1 close to the front end of the frame 5 and one side of the battery cell 1 close to the rear end of the frame 5 . The first limiting plate 301 is adhesively connected to the battery cell 1 .

[0048] In this embodiment, the battery cell 1 is composed of a plurality of battery cells arranged in an array, each row of batteries forming a battery pack, and a gap is left between the battery packs for installing the second limiting plate 302. The second limiting plate 302 is installed between the battery packs of the battery cell 1 and is glued to the battery packs.

[0049] The CTB battery pack structure with inverted cells eliminates the ball-proof structural components in traditional battery packs, that is, there is no need to set a ball-proof structural component under the cover plate 2, which reduces the body of the vehicle by 10 to 15 mm in the vertical direction. Because the cell 1 is installed on the body floor 501, the weight of the cell 1 is borne by the frame 5, and there is no need to add other supporting structures for bearing the weight of the cell 1 on the outside of the cover plate 2, which increases the distance between the bottom of the vehicle and the ground, greatly reducing the risk of vehicle bottom scraping and improving the safety of the vehicle.

[0050] The CTB battery pack structure with inverted cells reduces the number of battery pack parts, simplifies the battery pack structure and assembly process, and reduces manufacturing costs while maintaining the battery pack assembly efficiency.

[0051] In the present invention, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connect" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The shapes of the various components in the drawings are schematic, and certain differences from their actual shapes are not excluded. The drawings are only used to illustrate the principles of the present invention and are not intended to limit the present invention.

[0053] Although the utility model is disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and are not intended to limit the application of the utility model. The protection scope of the utility model is defined by the appended claims and may include various modifications, alterations and equivalents made to the utility model without departing from the protection scope and spirit of the utility model.

Claims

1. A CTB battery pack structure with inverted cells, which is installed on a frame at the bottom of the vehicle body, characterized in that: The CTB battery pack structure with inverted battery cells comprises a battery cell (1), a sealing plate (2) and a limiting structure (3); The battery cell (1) is installed in an inverted manner at the bottom of the frame, the limiting structure (3) is installed at the bottom of the frame and connected to the battery cell (1), the sealing plate (2) is installed at the bottom of the frame and below the battery cell (1), and a gap is left between the sealing plate (2) and the battery cell (1); The sealing plate (2) is provided with a weakening structure (201) for improving the safety of the battery pack.

2. The CTB battery pack structure with flipped cells according to claim 1, characterized in that: The vehicle frame comprises a vehicle body floor (501), and one end of the battery cell (1) not provided with a positive or negative electrode is adhesively connected to the vehicle body floor (501).

3. The CTB battery pack structure with flipped cells as claimed in claim 2, characterized in that: The weakened structure (201) is a blind hole structure symmetrically arranged on both sides of the sealing plate (2).

4. The CTB battery pack structure with flipped cells as claimed in claim 3, characterized in that: An explosion-proof valve (101) is provided at one end of the battery cell (1) that is not connected to the vehicle body floor (501), and the position of the weakened structure (201) corresponds to the position of the explosion-proof valve (101).

5. The CTB battery pack structure with flipped cells as claimed in claim 3, characterized in that: The thickness of the sealing plate (2) is 3 to 4 mm, and the thickness of the weakened structure (201) is 1 to 1.5 mm less than the thickness of the sealing plate (2).

6. The CTB battery pack structure with flipped cells as claimed in claim 2, characterized in that: The limiting structure (3) is located between the vehicle body floor (501) and the sealing plate (2), and the limiting structure (3) is adhesively connected to the battery cell (1) to fix the battery cell (1).

7. The CTB battery pack structure with flipped cells as claimed in claim 1, characterized in that: The limiting structure (3) comprises a first limiting plate (301) and a second limiting plate (302), and the first limiting plate (301) is connected to the second limiting plate (302).

8. The CTB battery pack structure with flipped cells as claimed in claim 7, characterized in that: The first limiting plate (301) is connected to the vehicle frame. There are two first limiting plates (301) respectively mounted on a side of the battery cell (1) close to the front end of the vehicle frame and a side of the battery cell (1) close to the rear end of the vehicle frame. The first limiting plate (301) is connected to the battery cell (1) by adhesive bonding.

9. The CTB battery pack structure with flipped cells as claimed in claim 7, characterized in that: A battery pack consisting of battery cells is arranged in the battery core (1), and the second limiting plate (302) is installed between the battery packs of the battery core (1) and is adhesively connected to the battery packs.

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