Bottom protection plate support structure and battery pack thereof

Abstract

Disclosed in the present application are a bottom protection plate support structure and a battery pack thereof. The bottom protection plate support structure comprises a support plate, a bottom protection plate and foam, wherein the support plate is provided with a plurality of battery positioning holes; a plurality of pieces of foam are provided, and all the pieces of foam are arranged between the support plate and the bottom protection plate; one end of the foam is fixedly connected to the bottom protection plate, and the end face of the other end of the foam is attached to the support plate; and the foam is arranged clear of the battery positioning holes. The foam can provide sufficient support, thereby ensuring the safety performance of the battery pack.

Description

A bottom protection plate support structure and battery pack thereof

[0001] The present application claims priority to the Chinese patent application No. 202421755481.2 filed on July 23, 2024 with the China Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a bottom protection plate support structure and battery pack thereof. BACKGROUND

[0003] In the related art, the design of the bottom support structure of the battery pack often encounters difficulties that are difficult to overcome, especially in terms of ensuring the flatness tolerance of the support plate and the energy absorption when the bottom is subjected to external force impact. The gravity of the module acts on the support plate, which is easy to cause deformation of the support plate, resulting in poor flatness, which in turn affects the installation accuracy of the module and the performance of the final product. In addition, when the bottom protection plate is impacted by external force, if there is no effective buffering mechanism, these forces may be directly transmitted to the module, causing damage.

[0004] At present, there is a support structure that sets a strip-shaped foam on the bottom of the box. The strip-shaped foam is used to absorb the influence of the module weight and manufacturing errors on the deformation of the support plate. The strip-shaped foam is slightly deformed and compressed to absorb the deformation caused by gravity or external forces. However, the use of strip-shaped foam will interfere with the position of the cell pressure relief valve due to its large area, thereby affecting the safety of the battery. In order to avoid the strip-shaped foam, it is necessary to redesign the layout of the cell or the position of the pressure relief valve or set up other drainage channels to set up a drainage channel in advance for the thermal runaway substances that may be discharged by the pressure relief valve. The above methods will increase the complexity and difficulty of the design. Adjusting or adding a drainage channel to the pressure relief valve means that additional processing steps such as drilling and installing a drainage pipe are required during the production and assembly process. This not only prolongs the production cycle, but also requires new production equipment and tools. The increase in corresponding process steps directly leads to an increase in processing costs, including material costs (such as drainage pipe materials), equipment investment, and additional labor costs. At the same time, design changes may also require retesting and verification for safety, which also increases the cost of research and development and certification. SUMMARY

[0005] The present application provides a bottom protection plate support structure and battery pack thereof, which can solve the problem of limited cell installation caused by the use of strip-shaped foam.

[0006] The present application provides a bottom protection plate support structure, comprising:

[0007] a support plate, the support plate being provided with a plurality of battery positioning holes;

[0008] The bottom protection plate;

[0009] The foams are provided in plurality, all of which are arranged between the support plate and the bottom protection plate, one end of the foam is fixedly connected with the bottom protection plate, the end face of the other end is attached to the support plate, and the foam is arranged away from the battery positioning hole.

[0010] The application also provides a battery pack comprising a battery module, a box, a box cover and a bottom protection plate support structure, the bottom protection plate is arranged at the bottom of the box, the battery module and the support plate are located in the box, and the support plate is located between the battery module and the bottom protection plate; the battery module comprises a battery and a glue layer, the glue layer wraps the side wall of the battery, the pressure relief valve of the battery is opposite to the battery positioning hole of the support plate, and the box cover is sealingly connected with the box. Advantages

[0011] The bottom protection plate support structure provided by the application provides positioning effect for the installation of the battery and provides a discharge channel for the pressure relief valve of the battery cell, the foams are provided in plurality and arranged away from the battery positioning hole, the pressure relief channel of the pressure relief valve is reserved, in addition, the foams are arranged in plurality, which can ensure that the foams can provide sufficient support while reducing the obstruction of the foams in the space between the support plate and the bottom protection plate, thereby ensuring the smoothness of the pressure relief channel and the safety performance of the battery pack adopting the bottom protection plate support structure.

[0012] The battery pack provided by the application integrates the foam design in the battery pack system, which can not only effectively cope with the self-weight of the battery and the manufacturing tolerance problem, but also correct the flatness deviation by absorbing the deformation of the support plate caused by gravity through the slight compression deformation of the foam, ensure the flatness and stability of the module installation platform, and improve the assembly precision and overall performance of the system; in addition, when facing the bottom external force impact, the foam acts as a key energy buffer medium, disperses and absorbs the impact force, relies on its deformation to absorb part of the external force, thereby greatly reducing the impact directly borne by the battery, significantly reducing the risk of external force damage, and enhancing the impact resistance and overall safety factor of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0013] FIG. 1 is an exploded structural schematic diagram of the bottom protection plate support structure in some implementation modes of the application;

[0014] FIG. 2 is a schematic diagram of the position relationship between the reverse surface of the support plate and the foam in some implementation modes of the application;

[0015] FIG. 3 is a schematic diagram of one of the setting modes of the foam in the state of the matrix setting of the battery positioning hole in some implementation modes of the application;

[0016] FIG. 4 is a schematic diagram of one of the setting modes of the foam in the state of the matrix setting of the battery positioning hole in some implementation modes of the application;

[0017] Figure 5 is one of the setting modes of the foam in the matrix state of the battery positioning hole in some implementations of the application;

[0018] Figure 6 is a schematic diagram of the setting mode of the foam in the staggered setting state of the battery positioning hole in some implementations of the application;

[0019] Figure 7 is an exploded structural schematic diagram of the battery pack in some implementations of the application.

[0020] Explanation of reference signs:

[0021] 1, support plate; 11, battery positioning hole; 2, bottom guard plate; 3, foam; 4, battery module; 5, box; 6, box cover. Embodiments of the application

[0022] Referring to Figure 1, the application discloses a bottom guard plate support structure, which comprises a support plate 1, a bottom guard plate 2 and a foam 3. The support plate 1 is provided with a plurality of battery positioning holes 11. The foam 3 is provided with a plurality of foam 3. All the foams 3 are arranged between the support plate 1 and the bottom guard plate 2. One end of the foam 3 is fixedly connected with the bottom guard plate 2, and the end face of the other end is attached to the support plate 1. The foam 3 is arranged away from the battery positioning hole 11.

[0023] Specifically, the support plate 1 and the bottom guard plate 2 are arranged in parallel. The foam 3 is arranged between the support plate 1 and the bottom guard plate 2. The support plate 1 is provided with the battery positioning hole 11. The battery positioning hole 11 is arranged through the support plate 1. The battery positioning hole 11 is used for positioning during battery installation. The battery positioning hole 11 corresponds to the pressure relief valve of the battery installed thereon. The heat runaway substances possibly discharged by the pressure relief valve are discharged to the position between the support plate 1 and the bottom guard plate 2 through the battery positioning hole 11, and then subsequently guided to the position of the explosion-proof valve of the box 5. The number and position of the battery positioning hole 11 can be adjusted according to the specific battery assembly condition. The foam 3 is arranged away from the battery positioning hole 11. In addition, the number and position of the foam 3 can be set and adjusted according to the specific load on the support plate 1 and the position of the battery positioning hole 11. The foam 3 supports the weight of the battery assembled on the support plate 1, and absorbs the deformation caused by the battery assembled on the support plate 1. The foam 3 can also absorb a certain external impact force that the bottom guard plate 2 may be subjected to, thereby reducing the impact directly borne by the battery and reducing the risk of damage to the entire battery pack by external force. More importantly, the foam 3 is divided into multiple arrangements. The shape and design volume of the foam 3 are more freely controlled. The foam 3 can minimize the obstruction of the cavity between the support plate 1 and the bottom guard plate 2, thereby ensuring the smoothness of the pressure relief passage, and further ensuring the safety performance of the battery pack using the bottom guard plate support structure.

[0024] Referring to FIGS. 2-6, in some embodiments, in order to facilitate the design of the position of the foam 3 and the battery positioning hole 11, the foam 3 is in contact with the support plate 1, and the plurality of battery positioning holes 11 are uniformly distributed at the periphery of the position where the foam 3 and the support plate 1 are in contact, that is, the foam 3 is taken as a midpoint, and the plurality of battery positioning holes 11 are uniformly arranged in the circumferential direction of the foam 3. Specifically, the main load on the support plate 1 is the battery assembled on the battery positioning hole 11, and correspondingly, the weight of the battery is also mainly concentrated at the battery positioning hole 11. The plurality of battery positioning holes 11 are uniformly arranged with the foam 3 as the midpoint, which can provide targeted support for the high load position on the support plate 1, that is, the position prone to deformation of the support plate 1 is supported in a targeted manner, so as to ensure that the support plate 1 is provided with sufficient support force and prevent the support plate 1 from being deformed excessively, and at the same time, the deformation amount of the position prone to deformation of the support plate 1 can be absorbed, thereby ensuring the safety and stability of the battery as a whole.

[0025] Referring to FIGS. 3-5, in some embodiments, the plurality of battery positioning holes 11 are arranged in a matrix, and the foam 3 is arranged between two adjacent columns of battery positioning holes 11 and / or between two adjacent rows of battery positioning holes 11.

[0026] Specifically, the battery positioning holes 11 are arranged in a matrix, and the row and column spacing can be set according to actual needs. The arrangement position of the foam 3 relative to the battery positioning hole 11 is that, among the battery positioning holes 11 arranged in a matrix, there are a plurality of 1x2 matrices, 2x1 matrices and 2x2 matrices.

[0027] Referring to FIG. 3, the battery positioning holes 11 in the 1x2 matrix are two battery positioning holes 11 adjacent in the same column, and the foam 3 can be arranged between the two battery positioning holes 11, that is, the foam 3 is arranged between two adjacent columns of battery positioning holes 11 as described above.

[0028] Referring to FIG. 4, the battery positioning holes 11 in the 2x1 matrix are two battery positioning holes 11 adjacent in the same row, and the foam 3 can be arranged between the two battery positioning holes 11, that is, the foam 3 is arranged between two adjacent rows of battery positioning holes 11 as described above.

[0029] At the same time, the arrangement position of the foam 3 in the 1x2 matrix and the arrangement position of the foam 3 in the 2x1 matrix are the case that the foam 3 is arranged between two adjacent columns and two adjacent rows of battery positioning holes 11.

[0030] Referring to FIG. 5, the battery positioning holes 11 in the 2x2 matrix, that is, in the two adjacent columns of battery positioning holes 11, taking the two adjacent rows of battery positioning holes 11, that is, the 2x2 matrix, that is, the above-mentioned foam 3 is arranged between the two adjacent columns and two adjacent rows of battery positioning holes 11.

[0031] On the basis of the above-mentioned structure of the matrix arranged battery positioning holes 11, a plurality of positions of the uniformly arranged foam 3 are provided, which can ensure that the distribution of the battery module 4 on the support plate 1 is more uniform, the weight of each battery is evenly dispersed, and the foam 3 is arranged between the columns and / or rows of the matrix arranged battery positioning holes 11, so that the stress points on the support plate 1 are more accurately supported, the local deformation caused by concentrated load is effectively reduced, the small deformation characteristics of the foam 3 are maximized, the impact caused by the weight of the module and installation error, and the vibration that may be generated in daily use are absorbed, the battery module 4 is protected from damage, and the direct pressure on the support plate 1 is reduced, and the flatness is maintained.

[0032] It should be noted that the specific number of foams 3 can be selected according to the load to be borne and the strength of the specific material of the foam 3.

[0033] On the basis of the above-mentioned structure of the matrix arranged battery positioning holes 11, the foam 3 and the battery positioning holes 11 are cylindrical, and the foam 3 is tangent to the two battery positioning holes 11 adjacent to the foam 3 or the four battery positioning holes 11 adjacent to the foam 3. Among them, the foam 3 is tangent to the two battery positioning holes 11 adjacent to the foam 3, that is, corresponding to the arrangement mode of the foam 3 in the above-mentioned 1x2 matrix and 2x1 matrix, and the foam 3 is tangent to the four battery positioning holes 11 adjacent to the foam 3, that is, corresponding to the arrangement mode of the foam 3 in the above-mentioned 2x2 matrix.

[0034] The cylindrical design of the specific battery positioning hole 11 is mainly aimed at the cylindrical battery corresponding positioning assembly. The foam 3 is designed in a cylindrical shape. Compared with the rectangular or other polygonal prism foam 3, the supporting force will be increased by one fourth. The foam 3 is tangent to the battery positioning hole 11, which can ensure that the foam 3 realizes the maximum design in a limited space, and then completes the maximum design of the supporting force of the foam 3.

[0035] Referring to FIG. 2 and FIG. 6, in some embodiments, the plurality of battery positioning holes 11 are arranged in multiple columns, and adjacent two columns of battery positioning holes 11 are staggered. The center point of each battery positioning hole 11 and the center points of the two battery positioning holes 11 in the adjacent column that are farthest away from each other form an isosceles triangle, and the foam 3 is arranged at the midpoint of each isosceles triangle. The same beneficial effects as the matrix arrangement of the battery positioning holes 11 are not repeated here. In addition, based on the staggered arrangement of the battery positioning holes 11, the center points of the three battery positioning holes 11, each of which is in the adjacent column and is farthest away from each other, can form an isosceles triangle, and the foam 3 is arranged at the midpoint of the isosceles triangle to ensure that the foam 3 can provide targeted support and ensure uniform support for the support plate 1, thereby ensuring the safety and stability of the battery.

[0036] It should be noted that the specific number of foams 3 can be selected according to the load to be borne and the specific material strength of the foam 3.

[0037] Based on the structure of the above-mentioned staggered arrangement of the adjacent two columns of battery positioning holes 11, in combination with the design that the foam 3 and the battery positioning holes 11 are both cylindrical, the adjacent two columns of battery positioning holes 11 can be designed more compactly, thereby increasing the battery density. When the adjacent two columns of cylindrical battery positioning holes 11 are designed more compactly, the rectangular foam 3 cannot maximize the volume of the foam 3 while ensuring that it does not interfere with the battery positioning holes 11. Therefore, the foam 3 is also designed to be cylindrical. In order to improve the support effect of the foam 3, the foam 3 is tangent to the three battery positioning holes 11 adjacent to it, which can maximize the volume of the foam 3 while ensuring that it does not interfere with the battery positioning holes 11, thereby ensuring that the design of the foam 3 is optimal.

[0038] In this embodiment, in order to balance the absorption of the deformation of the support plate 1 and the bottom guard plate 2 by the foam 3 and the sufficient support force that the foam 3 can provide to the support plate 1, the ratio of the diameter of the foam 3 to the hole diameter of the battery positioning hole 11 is 2:3. Through the above ratio design, the foam 3 can provide necessary support while deforming sufficiently to absorb and buffer the energy caused by the weight of the module and external impact. This ensures that the foam 3 reduces the probability of losing sufficient support force due to premature limit deformation or excessive softness when absorbing energy, thereby achieving a good balance between protecting the module from damage and maintaining structural stability.

[0039] In this embodiment, in order to ensure the performance of the foam 3, the foam 3 is made of polyurethane or polyethylene.

[0040] Specifically, polyurethane and polyethylene have good mechanical properties, can effectively absorb and disperse the weight and external impact force of the battery module 4, ensure the stability of the support structure and the safety of the module, and have good weather resistance and temperature adaptability, ensuring stable performance in different environmental conditions. In addition, its good processability and customizability enable the foam 3 to precisely fit the layout of the battery positioning hole 11, achieving efficient assembly, and the insulating properties of polyurethane and polyethylene themselves enhance the electrical safety level of the battery system.

[0041] The application also provides a battery pack, as shown in FIG. 7, which includes a battery module 4, a box 5, a box cover 6, and a bottom guard plate support structure. The bottom guard plate 2 is arranged at the bottom of the box 5, the battery module 4 and the support plate 1 are located in the box 5, and the support plate 1 is located between the battery module 4 and the bottom guard plate 2. The battery module 4 includes a battery and a glue layer that wraps the side wall of the battery. The pressure relief valve of the battery is opposite the battery positioning hole 11 of the support plate 1, and the box cover 6 is sealingly connected to the box 5.

[0042] Specifically, the addition of foam 3 in the system of the battery pack can effectively absorb the deformation of the support plate 1 caused by the weight of the battery and manufacturing tolerances, correct the poor flatness of the support plate 1 caused by gravity through slight compression deformation, ensure the flatness and stability of the module installation platform, and thus improve the assembly precision of the battery module 4 and the overall system performance.

[0043] In addition, when the bottom of the battery pack is subjected to external impact, the foam 3 as an energy absorption medium can disperse and absorb the impact force transmitted to the module. By deforming itself to absorb part of the impact energy, the foam 3 can avoid excessive force acting directly on the battery, reduce the risk of battery damage caused by external impact, and improve the impact resistance and overall safety of the battery pack.

[0044] In this embodiment, in order to ensure the safety of the foam 3 during use, the side wall of the support plate 1 abuts against the inner side wall of the box 5. Specifically, by abutting the side wall of the support plate 1 against the inner side wall of the box 5, the overall rigidity of the support structure can be effectively increased, preventing unnecessary movement or deviation of the support plate 1 when subjected to external pressure or vibration, thereby ensuring stable installation and safe operation of the battery module 4. More importantly, it can prevent the foam 3 from tilting or bending due to the deviation of the support plate 1, and further prevent some secondary problems caused by the tilting or bending of the foam 3, such as plastic deformation of the foam 3, loss of the function of the foam 3, etc.

Claims

1. A bottom protection plate support structure, comprising: Support plate (1), the support plate (1) is provided with a plurality of battery positioning holes (11); Bottom guard plate (2); Foam (3), multiple foams (3) are provided, all of which are located between the support plate (1) and the bottom guard plate (2). One end of the foam (3) is fixedly connected to the bottom guard plate (2), and the end face of the other end is in contact with the support plate (1). The foam (3) is set away from the battery positioning hole (11).

2. The bottom protective plate support structure according to claim 1, wherein, Multiple foams (3) abut against the support plate (1), and multiple battery positioning holes (11) are evenly distributed around the contact position between the foams (3) and the support plate (1).

3. A bottom support plate structure according to claim 1 or 2, wherein, The multiple battery positioning holes (11) are arranged in a matrix, and the foam (3) is evenly distributed between two adjacent rows of battery positioning holes (11).

4. A bottom support plate structure according to claim 1 or 2, wherein, The multiple battery positioning holes (11) are arranged in a matrix, and the foam (3) is evenly distributed between two adjacent rows of battery positioning holes (11).

5. A bottom support structure according to any one of claims 1 to 4, wherein, Both the foam (3) and the battery positioning hole (11) are cylindrical.

6. A bottom protective plate support structure according to claim 5, wherein, The outer peripheral surface of the foam (3) is tangent to the outer peripheral surfaces of the two adjacent battery positioning holes (11) of the foam (3).

7. A bottom protective plate support structure according to claim 5, wherein, The outer peripheral surface of the foam (3) is tangent to the outer peripheral surfaces of the four battery positioning holes (11) adjacent to the foam (3).

8. A bottom support structure according to any one of claims 1 to 7, wherein, The battery positioning holes (11) are arranged in multiple columns, and the adjacent columns of battery positioning holes (11) are staggered.

9. A bottom protective plate support structure according to claim 8, wherein, The line connecting the center point of each battery positioning hole (11) to the center points of the two battery positioning holes (11) in its adjacent column that are closest to each other forms an isosceles triangle, and the foam (3) is correspondingly located at the midpoint of each isosceles triangle.

10. A bottom support plate support structure according to claim 9, wherein, Both the foam (3) and the battery positioning hole (11) are cylindrical, and the outer peripheral surface of the foam (3) is tangent to the outer peripheral surfaces of the three battery positioning holes (11) adjacent to the foam (3).

11. A bottom support structure according to any one of claims 5 to 10, wherein, The ratio of the diameter of the foam (3) to the diameter of the battery positioning hole (11) is 2:

3.

12. A bottom support plate support structure according to any one of claims 1 to 11, wherein, The support plate (1) is arranged in parallel with the bottom protective plate (2).

13. A bottom support structure according to any one of claims 1 to 12, wherein, The foam (3) is made of polyurethane or polyethylene.

14. A battery pack, comprising a battery module (4), a housing (5), a cover (6), and a bottom protection plate support structure as described in any one of claims 1-13, wherein the bottom protection plate (2) is disposed at the bottom of the housing (5), the battery module (4) and the support plate (1) are located inside the housing (5), and the support plate (1) is located between the battery module (4) and the bottom protection plate (2); the battery module (4) comprises a battery and an adhesive layer, the adhesive layer wrapping the side wall of the battery, the pressure relief valve of the battery being opposite to the battery positioning hole (11) of the support plate (1), and the cover (6) being sealed to the housing (5).

15. A battery pack according to claim 14, wherein, The side wall of the support plate (1) abuts against the inner side wall of the box (5).

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