Battery pack

Abstract

The utility model discloses a battery pack which comprises a shell, a battery cell group and a reinforcing plate, the reinforcing plate comprises a polystyrene foam layer and a glass fabric layer, and the polystyrene foam layer wraps the glass fabric layer; wherein the battery cell group is arranged in the shell, the two side walls of the battery cell group in the length direction are respectively provided with a reinforcing plate, and the polystyrene foam layer is attached to the side walls of the battery cell group. Based on the lever principle, the weakest bending-resistant and shearing-resistant part is arranged in the length direction of the battery cell group, the reinforcing plates are arranged on the two sides of the length direction of the battery cell group, the bending-resistant and shearing-resistant performance of the battery pack can be improved in a targeted manner, and the reinforcing plates are composed of the polystyrene foam layers and the glass fiber cloth layers, so that the rigidity of the battery pack is enhanced, and the service life of the battery pack is prolonged. And the values of the dead weight and the volume of the battery pack are very low, the dead weight of the battery pack is not obviously increased, and excessive internal space of the shell is not occupied, so that high-density energy storage in the battery pack can be ensured. And the polystyrene foam layer and the glass fabric layer are made of better insulating materials, so that the safety of the battery pack is further improved.

Description

Technical Field

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

[0002] With the rapid development of the electric vehicle market, the requirements for battery energy density, safety, and reliability are increasing. Currently, battery packs, as the core component of electric vehicle battery packs, are usually composed of multiple cells connected in series or parallel. However, while this multi-cell structure improves energy density, it also brings the following problems:

[0003] First, the combination of multiple cells weakens the overall integrity of the battery pack. Gaps and connectors between cells can easily become areas of stress concentration when the battery pack is subjected to external impact or vibration, causing deformation or even fracture. Therefore, the low strength of the battery pack increases safety risks.

[0004] Secondly, in new energy vehicles and other battery packs requiring high battery capacity, the stacking and arrangement of multiple cells results in a larger overall battery pack. Due to the principle of leverage, the overall bending and shear resistance of the battery pack is significantly reduced. This is especially true when used in new energy vehicles, which often encounter speed bumps and other bumpy roads, subjecting the battery pack to a variety of complex road forces. If the battery pack's bending and shear resistance is insufficient, it is prone to deformation or damage, potentially leading to serious consequences such as battery short circuits, fires, and even explosions.

[0005] Finally, the insulation of the battery cells in the battery pack is generally processed by a glue potting process to form an insulating structure in which the battery cells are wrapped with a glue layer. However, the glue potting layer can only improve the insulation performance of the battery cells and cannot increase the rigidity of the battery pack. The battery pack still has safety hazards. Utility Model Content

[0006] In order to overcome at least one of the defects of the prior art described above, the present invention provides a battery pack, which can reduce the safety hazards caused by insufficient rigidity of the battery pack.

[0007] The technical solution adopted by the present invention to solve the problem is:

[0008] A battery pack, comprising:

[0009] case;

[0010] A battery cell group, the battery cell group is arranged in the shell;

[0011] A reinforcing plate, wherein each of the two side walls in the length direction of the battery cell group is provided with a reinforcing plate, the reinforcing plate comprising a foam layer and a glass fiber cloth layer, the foam layer wrapping the glass fiber cloth layer;

[0012] Wherein, the foam rubber layer is arranged to adhere to the side wall of the battery cell group.

[0013] By adopting the above solution, based on the principle of leverage, the length of the cell pack is the weakest point in terms of bending and shearing resistance. Installing reinforcement plates on both sides of the cell pack's length can specifically improve the battery pack's bending and shearing resistance. The reinforcement plates, composed of a foam rubber layer and a fiberglass cloth layer, enhance the rigidity of the battery pack while maintaining a low weight and volume. This does not significantly increase the pack's weight or occupy excessive internal space, thereby ensuring high-density energy storage within the battery pack. Furthermore, both the foam rubber layer and the fiberglass cloth layer are excellent insulating materials, further enhancing the safety of the battery pack.

[0014] In addition to the aforementioned benefits, the reinforcing plate, which combines a foam layer with a fiberglass cloth layer, offers greater convenience. Since the battery pack is already glued during production, the fiberglass cloth layer only needs to be placed in the corresponding position before the foam is poured. Some of the foam solidifies on the surface of the fiberglass cloth layer to form a foam layer, reducing the processing steps during production. Adding a reinforcing plate to the battery pack does not affect the time required for normal battery pack processing. Furthermore, the fiberglass cloth layer, due to its inherent burrs, can puncture the bubbles in the foam, thereby increasing the density of the foam and making the foam layer tend to solidify into glue, further increasing the strength and hardness of the reinforcing plate.

[0015] Furthermore, the glass fiber cloth layer has pores and burrs, the burrs penetrate into the foamed rubber layer, and the foamed rubber layer penetrates into the pores.

[0016] By adopting the above solution, the burrs penetrate into the foamed adhesive layer, and the foamed adhesive layer penetrates into the pores, thereby improving the bonding strength between the glass fiber cloth layer and the foamed adhesive layer.

[0017] Furthermore, the battery cell group includes a plurality of battery cells, and the plurality of battery cells are arranged in N columns, with (N-1) columns of gaps between the N columns of battery cells, wherein the reinforcing plate is provided in at least one column of the gaps, and the foamed rubber layer of the reinforcing plate is bonded to the adjacent battery cells.

[0018] By adopting the above solution, the number of battery cells will be increased to increase the energy storage capacity of the battery pack. In order to facilitate the assembly of the battery cell group, the battery cells will be divided into multiple columns. Based on the above structure, a reinforcing plate can be set in the gap of one or more columns according to the actual strength and insulation requirements.

[0019] Furthermore, it also includes a liquid cooling plate, and the liquid cooling plate is arranged in at least one row of the gaps.

[0020] By adopting the above solution, during the use of high-density battery packs, in order to prevent the battery packs from overheating and thus affecting the use of the battery packs, liquid cooling plates or reinforcing plates are selectively set in the gaps. When the heat dissipation demand is high, more liquid cooling plates can be selected. When the heat dissipation demand is met, reinforcing plates can be selectively set in other gaps, so that the battery pack can meet the heat dissipation demand, strength demand and insulation demand at the same time.

[0021] Furthermore, the battery cell is a cylindrical battery cell, and the foam layer of the reinforcing plate and the liquid cooling plate are both provided with a protruding structure toward the battery cell, the protruding structure extends between two adjacent cylindrical battery cells in the same column, and the protruding structure is in contact with the cylindrical surface of the cylindrical battery cell.

[0022] By adopting the above scheme, on the basis of the battery pack adopting cylindrical battery cells, the corresponding liquid cooling plate and the foam rubber layer of the reinforcing plate are provided with a raised structure for fitting with the cylindrical battery cells, thereby increasing the contact area between the liquid cooling plate and the battery cells, thereby improving the heat dissipation performance, and increasing the contact area between the reinforcing plate and the battery cells, thereby improving the strength and insulation performance of the battery pack.

[0023] Furthermore, the battery cells in two adjacent rows are staggered, the gap is serpentine, and the foam layer, the glass fiber cloth layer and the liquid cooling plate are all bent along the shape of the serpentine gap.

[0024] By adopting the above solution, the cylindrical cells are staggered, which can increase the cell density of the battery pack. When the cylindrical cells are staggered, the gap between two adjacent rows of cells becomes serpentine. Correspondingly, the foam layer, fiberglass cloth layer, and liquid cooling plate are arranged in a corresponding serpentine shape, which facilitates the installation of the reinforcement plate and liquid cooling plate within the serpentine gap. This minimizes the gap between the cells and ensures the required cell density of the battery pack. In addition, it can also ensure the contact area between the reinforcement plate and the liquid cooling plate with the cells, thereby ensuring the heat dissipation performance of the liquid cooling plate application, as well as the strength and insulation performance required by the reinforcement plate.

[0025] Furthermore, in two adjacent rows of the gaps, the liquid cooling plate is installed in one row of the gaps, and the reinforcing plate is installed in the other row of the gaps.

[0026] By adopting the above solution, in order to ensure uniform heat dissipation of the battery cell group, the liquid cooling plate and the reinforcement plate are assembled in a spaced manner. On the basis of ensuring uniform heat dissipation of the battery cell group, the reinforcement plates are also evenly arranged, thereby improving the rigidity and safety of the battery pack.

[0027] Furthermore, the battery cell group has a pressure relief valve, the pressure relief valve faces the bottom surface of the shell, the side of the shell opposite to the bottom surface is the top surface, the top surface is provided with the reinforcing plate on the side facing the battery cell group, and / or the top surface is provided with the reinforcing plate on the side facing away from the battery cell group.

[0028] By adopting the above solution, the pressure relief valves of the battery cell group are all set in the same direction, which facilitates the drainage of thermal runaway substances that may be generated in the battery cell group. On the basis of controlling the pressure relief valves in the same direction, a reinforcement plate is set on the top surface of the shell opposite to the bottom surface of the shell facing the pressure relief valve to enhance the strength of the top surface of the battery cell group, thereby increasing the safety of the battery pack during use, transportation, and stacking and storage.

[0029] Furthermore, the top surface of the shell is provided with an assembly groove, and the reinforcing plate is arranged in the assembly groove. When the reinforcing plate is located on the side of the top surface facing away from the battery cell group, the foam layer of the reinforcing plate is flush with the surrounding outer surface of the top surface of the shell.

[0030] By adopting the above solution, the top surface of the shell is provided with an assembly groove to facilitate the installation of the reinforcement plate, and at the same time, the integrity of the shell can still be maintained after the reinforcement plate is assembled into the assembly groove.

[0031] Furthermore, the glass fiber cloth layer is provided with three layers.

[0032] This solution creates a more robust "skeleton" with three fiberglass layers, enhancing the mechanical strength and rigidity of the reinforcement plate. This helps reduce deformation of the battery pack when subjected to external impact, vibration, or pressure, while also improving the overall structural stability of the battery pack and reducing the risk of damage from external forces.

[0033] Furthermore, a pressure relief through hole group corresponding to the battery cell group is provided on the bottom surface of the shell.

[0034] By adopting the above solution, the bottom surface of the shell is provided with a group of pressure relief through holes corresponding to the battery cell group, which facilitates the arrangement of the pressure relief valve of the battery cell group.

[0035] In summary, the battery pack provided by the present invention has the following technical effects:

[0036] 1. Reinforcement plates are installed on both sides of the battery pack in the longitudinal direction. Based on the principle of leverage, the bending and shear resistance of the battery pack are specifically enhanced, effectively solving the problem of easy deformation of the battery pack when subjected to stress.

[0037] 2. The foam layer and glass fiber cloth layer structure of the reinforcement plate maintains a low weight and volume without reducing the high energy density of the battery pack, achieving dual optimization of structural strength and space efficiency.

[0038] 3. The foam layer and fiberglass cloth layer of the reinforcing plate material are both insulating materials, which enhance the insulation performance of the battery pack, increase the safety factor of the battery pack, and effectively prevent problems such as short circuits caused by poor insulation.

[0039] In addition to the above technical effects:

[0040] 4. Since glue pouring is required in the manufacturing process of the battery pack, the existing glue pouring process is combined with the existing glue pouring process. It is only necessary to place glass fiber cloth in the corresponding position and then pour the foam glue. This simplifies the process of adding reinforcement plates, reduces additional processing costs, shortens production time, and improves production efficiency.

[0041] 5. The burr characteristics of the glass fiber cloth layer help eliminate bubbles in the foam, making the foam denser. This solidification trend significantly enhances the density, strength and hardness of the foam layer, further improving the physical properties of the reinforcement plate and ensuring the stability and durability of the battery pack structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0043] Figure 2 This is a schematic diagram of the explosion structure of the utility model;

[0044] Figure 3 for Figure 2 A magnified view of part A;

[0045] Figure 4 This is a schematic diagram of the battery cell, reinforcement plate and liquid cooling plate in the separated state of the utility model;

[0046] Figure 5 This is a schematic diagram of the partial three-dimensional structure of the battery cell group, reinforcement plate and liquid cooling plate of the utility model;

[0047] Figure 6 This is a schematic diagram of a partial top view of the battery cell group, reinforcement plate and liquid cooling plate of the present invention.

[0048] Among them, the meanings of the figure marks are as follows: 1. Shell; 11. Top surface; 111. Assembly groove; 12. Bottom surface; 121. Pressure relief hole group; 2. Battery cell group; 21. Battery cell; 3. Reinforcement plate; 31. Protruding structure; 4. Liquid cooling plate. DETAILED DESCRIPTION

[0049] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0050] In order to facilitate the understanding of the embodiments of the present invention, the following will be further explained with reference to specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0051] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0053] Reference Figure 1-Figure 2 As shown, the utility model discloses a battery pack, including a shell 1, a battery cell group 2 and a reinforcing plate 3, the reinforcing plate 3 includes a foam layer and a glass fiber cloth layer, the foam layer wraps the glass fiber cloth layer, wherein the battery cell group 2 is arranged in the shell 1, and a reinforcing plate 3 is respectively provided on both side walls of the battery cell group 2 in the length direction, and the foam layer is arranged in contact with the side walls of the battery cell group 2.

[0054] Specifically, the battery pack consists of a housing 1, a cell group 2, and a reinforcing plate 3. The cell group 2 is disposed within the housing 1. The reinforcing plate 3 is composed of a glass fiber cloth layer wrapped within a foam layer. The foam layer is made of foam, and the glass fiber cloth layer is made of glass fiber cloth. A reinforcing plate 3 is provided on each side wall of the cell group 2 along its length, and the reinforcing plates 3 are positioned in contact with the side walls of the cell group 2. Since the side walls of the cell group 2 are where stress is most concentrated, the reinforcing plates 3 are positioned in contact with the side walls of the cell group 2, that is, the foam layer is positioned in contact with the side walls of the cell group 2, thereby specifically improving the strength of the side walls along the length of the battery pack. The above side walls can be the top side walls and bottom side walls of the battery cell group 2, or can be the side walls corresponding to the cylindrical surfaces of the battery cells 21 in the length direction of the battery cell group 2, that is, without affecting the normal setting of the pressure relief valve of the battery cells 21 in the battery cell group 2, the reinforcing plate 3 can be set on the top side walls and bottom side walls of the battery cell group 2, or on the corresponding left and right side walls of the battery cell group 2 in the length direction. In addition, the shape of the reinforcing plate 3 can be set according to the shape of the side walls of the battery cell group 2, that is, the foam layer and the glass fiber cloth layer can be set according to the shape of the side walls of the battery cell group 2.

[0055] The specific processing process for the reinforcing plate 3 can be achieved by pre-spraying foam glue on the outside of the fiberglass cloth layer to form the reinforcing plate 3. Alternatively, the fiberglass cloth layer can be arranged on the side wall of the battery cell group 2 within the housing 1. During the glue injection process for the battery cell group 2, some of the foam glue solidifies on the surface of the fiberglass cloth layer to form a foam glue layer. This reduces the number of production steps, and the addition of the reinforcing plate 3 to the battery pack does not affect the time required for normal battery pack processing. In addition, due to the material properties of the fiberglass cloth layer, the burrs can puncture the bubbles in the foam glue, thereby increasing the density of the foam glue and making the foam glue layer tend to solidify, further increasing the strength and hardness of the reinforcing plate 3.

[0056] In some embodiments, in order to improve the bonding strength between the fiberglass cloth layer and the foam rubber layer, the fiberglass cloth layer has pores and burrs, the burrs penetrate into the foam rubber layer, and the foam rubber layer penetrates into the pores.

[0057] Specifically, due to the material properties of the fiberglass cloth comprising the fiberglass fabric layer, which is characterized by pores and burrs, and the arrangement in which the burrs penetrate the foamed adhesive layer and the foamed adhesive layer penetrates the pores, the contact area between the fiberglass cloth layer and the foamed adhesive layer is greatly increased, thereby effectively improving the bonding strength between the fiberglass cloth layer and the foamed adhesive layer. Furthermore, based on the structural characteristics of the fiberglass cloth layer, during the processing of the reinforcing plate 3, the fiberglass cloth comprising the fiberglass cloth layer is fixed to the mold used for processing the reinforcing plate 3, and then the foamed adhesive comprising the foamed adhesive layer is injected into the mold. Due to the pores and burrs in the fiberglass cloth layer, the foamed adhesive will flow into the pores in the fiberglass cloth layer. Correspondingly, the burrs in the foamed adhesive will also puncture the bubbles in the foamed adhesive, thereby increasing the density of the foamed adhesive comprising the foamed adhesive layer and making the foamed adhesive layer tend to solidify, thereby significantly improving the strength and hardness of the foamed adhesive layer.

[0058] In some embodiments, in order to increase the energy storage capacity of the battery pack, the number of battery cells 21 will be increased. The battery cell group 2 includes multiple battery cells 21, and the multiple battery cells 21 are arranged in N columns. There are (N-1) columns of gaps between the N columns of battery cells 21, and a reinforcing plate 3 is provided in at least one column of gaps. The foam layer of the reinforcing plate 3 is bonded to the adjacent battery cells 21.

[0059] Specifically, the battery cell group 2 is composed of multiple battery cells 21, and the multiple battery cells 21 are divided into N columns, and (N-1) columns of gaps are formed between the N columns of battery cells 21. According to the actual strength and insulation requirements, a reinforcing plate 3 can be selected to be set in one or more columns of gaps. Correspondingly, the foam layer of the reinforcing plate 3 is made to fit the side wall of the adjacent battery cell 21.

[0060] In some embodiments, in order to prevent the battery pack from overheating and affecting the use of the battery pack, the battery pack also includes a liquid cooling plate 4, wherein the liquid cooling plate 4 is set in at least one column of gaps, and the liquid cooling plate 4 and the reinforcing plate 3 can be set in a manner as follows: selectively setting the liquid cooling plate 4 or the reinforcing plate 3 in the gap. When the heat dissipation demand is high, more liquid cooling plates 4 can be set. When the heat dissipation demand is met, the reinforcing plates 3 can be selectively set in other gaps, so that the battery pack can meet the heat dissipation demand, strength demand and insulation demand at the same time.

[0061] Reference Figure 4 As shown, in some embodiments, when the battery cell 21 adopts a cylindrical battery cell, the foam layer of the reinforcing plate 3 and the liquid cooling plate 4 are both provided with a protruding structure 31 toward the battery cell 21, and the protruding structure 31 extends between two adjacent cylindrical battery cells in the same column, and the protruding structure 31 is in contact with the cylindrical surface of the cylindrical battery cell.

[0062] Specifically, the raised structure 31 is arranged corresponding to the side wall of the cylindrical battery cell, so as to increase the contact area between the liquid cooling plate 4 and the battery cell 21, thereby improving the heat dissipation performance, and increase the contact area between the reinforcing plate 3 and the battery cell 21, thereby improving the strength and insulation performance of the battery pack.

[0063] It should be noted that Figure 4 In order to demonstrate the relationship between the shape of the protruding structure 31 and the cylindrical battery cell, the gaps between the reinforcing plate 3, the liquid cooling plate 4 and the cylindrical battery cell are increased, and they are actually arranged in a fitted state.

[0064] Reference Figure 5 and Figure 6 As shown, on the basis of the cylindrical battery cells 21, in order to improve the density of the battery cells 21 of the battery pack, the two adjacent columns of battery cells 21 are staggered, and the gap is serpentine as the battery cells 21 are staggered. Correspondingly, the reinforcing plate 3 and the liquid cooling plate 4 are both set to a serpentine shape corresponding to the serpentine gap, that is, the foamed rubber layer and the glass fiber cloth layer of the reinforcing plate 3 are both set to a serpentine shape corresponding to the serpentine gap, so that the foamed rubber layer, the glass fiber cloth layer and the liquid cooling plate 4 can be arranged in the serpentine gap, so that the gap between the battery cells 21 is controlled to the minimum, ensuring the proper density of the battery cells 21, and also ensuring the contact area between the foamed rubber layer and the battery cells 21, as well as the contact area between the liquid cooling plate 4 and the battery cells 21, thereby ensuring the heat dissipation performance of the liquid cooling plate 4 and ensuring the proper strength and insulation performance of the reinforcing plate 3.

[0065] In some embodiments, in order to ensure uniform heat dissipation of the battery cell group 2, the gaps in the N-1 column are arranged according to the following arrangement: in two adjacent columns of gaps, a liquid cooling plate 4 is installed in one column of gaps, and a reinforcing plate 3 is installed in the other column of gaps, that is, the liquid cooling plate 4 and the reinforcing plate 3 are installed in a manner of being spaced apart. On the basis of ensuring uniform heat dissipation of the battery cell group 2, the reinforcing plates 3 are also evenly arranged, thereby improving the rigidity and safety of the battery pack.

[0066] In addition, when setting the liquid cooling plate 4 in some battery packs, a single-sided liquid cooling plate 4 is adopted. In this battery pack setting method, it is only necessary to set the reinforcing plate 3 in the gap where the liquid cooling plate 4 is not set. In this way, the reinforcing plates 3 are set at intervals without affecting the setting method of the single-sided liquid cooling plate 4, thereby enhancing the rigidity and safety of the battery pack.

[0067] In some embodiments, to ensure battery safety, a pressure relief valve is provided on the cell group 2. When the cell group 2 is composed of multiple cells 21, the pressure relief valve of each cell 21 faces the same direction to facilitate the drainage of thermal runaway substances that may be generated by the multiple cells 21. The pressure relief valve faces the bottom surface 12 of the housing 1, that is, corresponds to the bottom side wall of the cell group 2. The side of the housing 1 opposite to the bottom surface 12 is the top surface 11. The top surface 11 is provided with a reinforcement plate 3 on the side facing the cell group 2, and / or the top surface 11 is provided with a reinforcement plate 3 on the side facing away from the cell group 2. Correspondingly, to facilitate the arrangement of the pressure relief valves of the multiple cells 21 in the cell group 2, the reinforcement plate 3 is no longer provided in the direction where the pressure relief valve is provided on the cell 21.

[0068] Specifically, the reinforcing plate 3 can be provided on the top surface 11 of the housing 1 facing the cell group 2, or on the top surface 11 of the housing 1 facing away from the cell group 2, or in both locations. This enhances the strength of the top surface 11 of the cell group 2, thereby increasing the safety of the battery pack during use, transportation, and stacking and storage. That is, during use, transportation, and stacking and storage, the foam layer can provide good energy absorption. The combination of the fiberglass cloth layer and the foam layer also provides a certain degree of bending strength for the top of the entire battery pack, thereby achieving the effect of increasing the safety of the battery pack.

[0069] Reference Figure 3 As shown, based on the structure that the reinforcing plate 3 is provided on the side of the top surface 11 of the shell 1 facing away from the battery cell group 2, the top surface 11 of the shell 1 is provided with an assembly groove 111, and the reinforcing plate 3 is arranged in the assembly groove 111 and is flush with the four sides of the top surface 11 of the shell 1, so as to facilitate the installation of the reinforcing plate 3. At the same time, the foam layer of the reinforcing plate 3 is flush with the outer surface of the top surface 11 of the shell 1. After the reinforcing plate 3 is assembled to the assembly groove 111, the integrity of the shell 1 can still be maintained.

[0070] In some embodiments, it is optimal to have three layers of fiberglass cloth within the reinforcing plate 3. This structure forms a stronger "skeleton," enhancing the mechanical strength and rigidity of the reinforcing plate 3. This helps reduce deformation of the battery pack when subjected to external impact, vibration, or pressure, improves the overall structural stability of the battery pack, and reduces the risk of damage to the battery pack due to external forces.

[0071] In some embodiments, in order to improve the safety of the battery pack, the bottom surface 12 of the shell 1 is provided with a pressure relief through hole group 121 corresponding to the battery cell group 2, that is, the pressure relief through hole group 121 is provided with a pressure relief valve of the battery cell group 2, so that the thermal runaway substances that may be generated by the battery cell group 2 are discharged to the outside of the battery pack through the pressure relief through hole group 121, thereby improving the safety of the battery pack.

[0072] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: include: Housing (1); A battery cell group (2), the battery cell group (2) being arranged in the housing (1); A reinforcing plate (3), each of the two side walls of the battery cell group (2) in the length direction being provided with a reinforcing plate (3), the reinforcing plate (3) comprising a foaming rubber layer and a glass fiber cloth layer, the foaming rubber layer wrapping the glass fiber cloth layer; Wherein, the foamed rubber layer is arranged to adhere to the side wall of the battery cell group (2).

2. A battery pack according to claim 1, characterized in that: The glass fiber cloth layer has pores and burrs, the burrs invade the foam rubber layer, and the foam rubber layer invades the pores.

3. The battery pack according to claim 1, wherein: The battery cell group (2) comprises a plurality of battery cells (21), wherein the plurality of battery cells (21) are arranged in N columns, and there are (N-1) columns of gaps between the N columns of battery cells (21), wherein the reinforcing plate (3) is provided in at least one column of the gaps, and the foaming rubber layer of the reinforcing plate (3) is bonded to the adjacent battery cells (21).

4. The battery pack according to claim 3, characterized in that: It also includes a liquid cooling plate (4), and the liquid cooling plate (4) is arranged in at least one row of the gaps.

5. The battery pack according to claim 4, characterized in that: The battery core (21) is a cylindrical battery core, and the foamed rubber layer of the reinforcing plate (3) and the liquid cooling plate (4) are both provided with a protruding structure (31) facing the battery core (21), the protruding structure (31) extends between two adjacent cylindrical battery cores in the same row, and the protruding structure (31) is in contact with the cylindrical surface of the cylindrical battery core.

6. The battery pack according to claim 4, characterized in that: The battery cells (21) in two adjacent rows are staggered, the gap is serpentine, and the foamed rubber layer, the glass fiber cloth layer and the liquid cooling plate (4) are all bent along the shape of the serpentine gap.

7. The battery pack according to claim 4, characterized in that: In the gaps in two adjacent columns, the liquid cooling plate (4) is installed in one column of the gaps, and the reinforcing plate (3) is installed in the other column of the gaps.

8. The battery pack according to claim 1, characterized in that: The battery cell group (2) has a pressure relief valve, the pressure relief valve faces the bottom surface (12) of the housing (1), the side of the housing (1) opposite to the bottom surface (12) is a top surface (11), the top surface (11) is provided with the reinforcing plate (3) on the side facing the battery cell group (2), and / or the top surface (11) is provided with the reinforcing plate (3) on the side facing away from the battery cell group (2).

9. The battery pack according to claim 8, characterized in that: The top surface (11) of the shell (1) is provided with an assembly groove (111), and the reinforcing plate (3) is arranged in the assembly groove (111). When the reinforcing plate (3) is located on the side of the top surface (11) facing away from the battery cell group (2), the foaming rubber layer of the reinforcing plate (3) is flush with the outer surface of the top surface (11) of the shell (1) on all sides.

10. A battery pack according to any one of claims 1 to 9, characterized in that: The glass fiber cloth layer is provided with three layers.

11. The battery pack according to claim 1, characterized in that: The bottom surface (12) of the housing (1) is provided with a pressure relief through hole group (121) corresponding to the battery cell group (2).

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