Case protection structure and battery pack

Abstract

To provide a case protection structure capable of effectively improving impact resistance strength of a bottom protection plate and improving a protection effect to a battery module.SOLUTION: Disclosed is a box protective structure comprising a bottom protective plate, wherein a battery module (500) is placed on the bottom protective plate (120), the bottom protective plate is provided with a reinforcing plate (200) on a side facing away from the battery module, a buffer block (300) is provided on a side facing the battery module, the buffer block is disposed between the battery module and the bottom protective plate, the reinforcing plate comprises a plurality of support portions and a plurality of connection portions that are alternately distributed and connected to each other, the support portions are spaced apart from the bottom protective plate, the connection portions abut against the bottom protective plate, and the buffer blocks are disposed corresponding to the positions of the connection portions.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present application relates to the technical field of battery equipment, for example, to a case protective structure and a battery pack. [Background technology]

[0002] With the rapid development of the new energy battery industry, the safety requirements for batteries are also becoming increasingly higher. In the long-term use of battery packs for electric vehicles, the physical strength and crash and impact resistance of the battery pack become increasingly important. During normal use, the bottom of the battery pack is attached and fixed to external electrical equipment such as an electric vehicle, so most of the crashes and impacts that the battery pack receives mainly come from the bottom of the battery pack. Summary of the Invention [Problem to be solved by the invention]

[0003] The battery pack case structure only adopts an ordinary design, and the bottom of the case structure does not have a special protective design. Therefore, the case structure only functions as a carrier and container for the battery module, and the protective effect for the battery module is ordinary. As a result, in a large number of new energy vehicles, the bottom of the battery pack case structure is damaged or destroyed, causing the battery pack to ignite and even explode, posing a serious risk to the lives and property safety of the driver and passengers. [Means for solving the problem]

[0004] The present application provides a case protection structure that can effectively improve the impact resistance of the bottom protection plate and improve the protection effect for the battery module.

[0005] The present application provides a battery pack that can effectively improve the protective effect on the battery module and improve the safety of the entire battery pack.

[0006] In one aspect, a case protection structure is provided which includes a bottom protective plate on which a battery module is placed, the bottom protective plate having a reinforcing plate on the side facing away from the battery module and a buffer block on the side facing the battery module, the buffer block being disposed between the battery module and the bottom protective plate, the reinforcing plate having a plurality of support portions spaced apart from the bottom protective plate and a plurality of connection portions abutting the bottom protective plate, which are alternately distributed and connected to each other, and the buffer blocks being disposed corresponding to the positions of the connection portions.

[0007] In another aspect, there is provided a battery pack including the above-described case protection structure and a case body in which a mounting chamber is provided for mounting a battery module and a buffer block. [Effects of the Invention]

[0008] The beneficial effects of the present application are as follows: The case protective structure of the present application provides effective protection and reinforcement for the bottom protective plate by providing a reinforcing plate on the outside of the bottom protective plate, improving the impact resistance of the entire bottom structure of the case body, effectively protecting the protective performance of the entire battery pack structure, and ensuring normal operation of the battery pack. A buffer block is further provided on the side of the bottom protective plate facing the battery modules, and is located between the battery modules and the bottom protective plate. This provides a buffering effect and absorbs impact energy, achieving buffering and energy absorption for the battery modules, reducing the impact energy transmitted to the battery modules after the bottom protective plate is impacted, reducing the extent and possibility of damage or destruction of the battery modules, and achieving effective protection for the battery modules. The buffer block is located at the connection point between the reinforcing plate and the bottom protective plate, which is in the force transmission path, thereby increasing the energy absorption efficiency of the buffer block and improving the protective performance of the entire structure. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a structural schematic diagram of a battery pack according to an embodiment of the present invention; [Figure 2] 1 is an exploded structural schematic diagram of a case protection structure according to an embodiment of the present application; [Figure 3] 1 is a partial structural schematic diagram of one side of a case protection structure according to an embodiment of the present application; [Figure 4] 1 is a schematic cross-sectional view of a case protection structure according to an embodiment of the present application; [Figure 5] FIG. 5 is an enlarged schematic structural view of part A in FIG. [Figure 6] 1 is a schematic cross-sectional view of a bottom protection plate according to an embodiment of the present invention; [Figure 7] 2 is a structural schematic diagram of a buffer plate and a connection supporter according to an embodiment of the present application; FIG. [Figure 8] 1 is a structural schematic diagram of a reinforcing plate according to an embodiment of the present invention; [Figure 9] 1 is a structural schematic diagram of a bracket according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present application will be described in detail below with reference to the drawings and examples. It will be understood that the specific examples described here are merely for the purpose of understanding the present application and are not intended to limit the present application. For ease of explanation, the drawings show only a portion of the present application, not all of the structures.

[0011] In the description of this application, unless otherwise clearly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or integration, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interaction between two elements. Those skilled in the art can understand the meaning of the terms in this application depending on the context.

[0012] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, a first feature being "above," "above," and "on the upper surface" of a second feature may include the first feature being directly above and diagonally above the second feature, or the first feature having a higher horizontal height than the second feature. A first feature being "below," "below," and "on the lower surface" of a second feature may include the first feature being directly below and diagonally below the second feature, or the first feature having a lower horizontal height than the second feature.

[0013] In the description of the present embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are merely used to facilitate the description and simplify the operation. They do not indicate or imply that the referenced devices or elements must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are merely used to distinguish between the two in the description and do not have any special meaning.

[0014] As shown in Figures 1 to 9, the case protection structure of this embodiment includes a bottom protective plate 120, a battery module 500 is placed on the bottom protective plate 120, a reinforcing plate 200 is provided on the side of the bottom protective plate 120 facing away from the battery module 500, and a buffer block 300 is provided on the side facing the battery module 500, the buffer block 300 is provided between the battery module 500 and the bottom protective plate 120, the reinforcing plate 200 has a plurality of support portions 210 and a plurality of connecting portions 220 that are alternately distributed and connected to each other, the support portions 210 are provided at a distance from the bottom protective plate 120, the connecting portions 220 abut against the bottom protective plate 120, and the buffer block 300 is provided corresponding to the position of the connecting portions 220.

[0015] In this embodiment, the reinforcing plate 200 is provided on the outside of the bottom protective plate 120, which effectively protects and reinforces the bottom protective plate 120, improves the impact resistance of the entire bottom structure of the case body 100, effectively protects the protective performance of the entire structure of the battery pack, and ensures normal operation of the battery pack. A buffer block 300 is further provided on the side of the bottom protective plate 120 facing the battery module 500, and is located between the battery module 500 and the bottom protective plate 120. The buffer block 300 provides a buffering effect and absorbs impact energy, thereby realizing the buffering and energy absorption functions for the battery module 500, reducing the impact energy transmitted to the battery module 500 after the bottom protective plate 120 is impacted, reducing the possibility of the battery module 500 being damaged or destroyed, and achieving effective protection for the battery module 500. The buffer block 300 is located at the connection position between the connection portion 220 of the reinforcing plate 200 and the bottom protective plate 120. Since this position is in the force transmission path, the energy absorption efficiency of the buffer block 300 can be increased and the protective performance of the entire structure can be improved.

[0016] 6 and 7, the bottom protection plate 120 includes a substrate 121 and two buffer plates 122 disposed on either side of the substrate 121 in the thickness direction. The substrate 121 has a plurality of wetting holes 1211 penetrating the substrate 121, and connection supports 123 are provided within the wetting holes 1211. The two buffer plates 122 on either side of the substrate 121 are connected via the connection supports 123. The wetting holes 1211 are uniformly distributed on the substrate 121, which firmly ensures the connection between the two buffer plates 122 on either side of the substrate 121 and the connection supports 123, ensuring that the two buffer plates 122 on either side of the substrate 121 are subjected to as uniform a force as possible, which is beneficial to improving the overall impact resistance of the bottom protection plate 120 and the protective effect of the bottom protection plate 120.

[0017] In one embodiment, the two buffer plates 122 on both sides of the base plate 121 are respectively fixedly connected to the connecting support 123, and the two buffer plates 122 on both sides of the base plate 121 and the connecting support 123 are integrally injection molded, which is advantageous in ensuring the formation of a sandwich-structured bottom protective plate 120 by the protective structure consisting of the two buffer plates 122 on both sides of the base plate 121 and the connecting support 123 and the base plate 121, and the structure of such a bottom protective plate 120 is more robust, which improves the impact resistance of the bottom protective plate 120 and the protective effect of the bottom protective plate 120.

[0018] In actual operation, the buffer plate 122 is a polyurethane buffer plate or a modified epoxy resin buffer plate, and the polyurethane buffer plate and the modified epoxy resin buffer plate have strong polarity and high strength after curing, which allows the bottom protection plate 120 to have better impact resistance and improve the protective effect of the bottom protection plate 120. Of course, in addition to that of this embodiment, buffer plate 122 made of other materials and structures may be used as long as it can improve the impact resistance of the bottom protection plate 120 and improve the protective effect of the bottom protection plate 120, and all such designs fall within the scope of protection of the present application.

[0019] In one embodiment, the reinforcing plate 200 has a corrugated shape, and the protrusion on the corrugated reinforcing plate 200 facing the bottom protective plate 120 is the connecting portion 220, and the protrusion on the corrugated reinforcing plate 200 facing away from the bottom protective plate 120 is the supporting portion 210, so that a buffer passage 240 is formed between the supporting portion 210 and the bottom protective plate 120. When the bottom of the battery pack is impacted, the supporting portion 210 contacts the external device outward and thus receives the impact first. The impact force is conducted along the connection between the supporting portion 210 and the connecting portion 220 to the connecting portion 220, and then via the connecting portion 220 to the bottom protective plate 120, the buffer block 300, and the battery module 500. This multiple protection greatly reduces the impact on the battery module 500 when the bottom of the battery pack is impacted, protecting the battery module 500 from damage or destruction and advantageously ensuring the safety of the battery module 500. When the support part 210 receives an impact, a buffer passage 240 is provided between the support part 210 and the bottom protective plate 120, thereby providing a certain degree of buffering effect against the impact and preventing the impact force from being directly transmitted from the support part 210 to the bottom protective plate 120.

[0020] In addition to the one in this embodiment, other structural types of the reinforcing plate 200, such as a pulse shape, may be adopted, as long as they can achieve the protective and conductive effects of the reinforcing plate 200 in this embodiment, and all such designs fall within the scope of protection of the present application.

[0021] In one embodiment, a buffer layer 230 is provided on the side of the reinforcing plate 200 facing away from the bottom protective plate 120, thereby improving the impact resistance of the reinforcing plate 200 and enhancing the protective effect of the reinforcing plate 200 on the bottom protective plate 120. The buffer layer 230 is a PVC buffer layer, and in operation, a layer of PVC buffer layer is spray-coated on the bottom of the reinforcing plate 200, which can effectively reduce noise and also provide a certain buffering and energy absorption function.

[0022] In one embodiment, multiple buffer blocks 300 are provided, and the multiple buffer blocks 300 are distributed in a matrix pattern within the loading chamber 110 along the length of the connecting portion 220, thereby allowing the impact energy transmitted through the connecting portion 220 to be uniformly absorbed by the buffer blocks 300, and avoiding a situation where effective protective effect cannot be achieved due to poor energy absorption effect in some areas.

[0023] In actual operation, the buffer block 300 is made of a hard buffer material such as PU, EPP, EPA, or PPE, which provides excellent energy absorption for the buffer block 300. Of course, other energy absorption materials may be used as long as they can ensure the energy absorption properties and energy absorption effect of the buffer block 300, and all such designs are within the scope of protection of the present application.

[0024] In one embodiment, the battery pack further includes a bracket 400, which is disposed within the mounting chamber 110 and between the battery module 500 and the buffer block 300 to provide support for the battery module 500. When the battery module 500 is mounted on the bracket 400, the battery module 500 is spaced apart from the bottom protective plate 120 via the buffer block 300, thereby effectively reducing the impact force transmitted to the battery module 500 after the bottom protective plate 120 is impacted, which is beneficial to improving the protection effect for the battery module 500. The bracket 400 is provided with an escape through-hole 410 corresponding to the pressure relief valve of the battery module 500, to facilitate the installation and fixing of the battery module 500 and avoid affecting the normal pressure relief of the battery module 500.

[0025] In one embodiment, a buffer block 300 is used to provide a gap between the bracket 400 and the bottom protective plate 120, forming a pressure relief chamber 150, and the pressure relief valve communicates with the pressure relief chamber 150 via an escape through-hole 410. The pressure relief chamber 150 provides a pressure relief space for the battery module 500, reducing the risk of the case body 100 expanding and causing further explosion or damage due to excessive pressure in the mounting chamber 110 when the battery module 500 is released, which is advantageous for improving the safety performance of the battery pack.

[0026] 1 to 9 , this embodiment further provides a battery pack 1 including a case body 100. The case body 100 has a case protective structure, and a mounting chamber 110 is provided within the case body 100 to mount the battery module 500 and the buffer block 300. As a result, the case body 100 of the battery pack 1 in this embodiment can have good bottom support and protection effects, and effectively cushions and protects against collisions and impacts from the bottom of the battery pack 1, reducing the impact of these collisions and impacts on the battery module 500 inside the battery pack 1. This ensures the safety performance of the battery pack 1 and reduces the risk of the battery pack 1 catching fire and even exploding due to damage or destruction to the bottom of the battery pack 1, which is beneficial to ensuring the safety of the lives and property of the driver and passengers.

[0027] In one embodiment, the case body 100 further includes a frame 130 and a cover plate 140, and the bottom protective plate 120, the frame 130, and the cover plate 140 are connected to each other to form a sealed mounting chamber 110. The bottom protective plate 120, the frame 130, and the cover plate 140 mount, seal, and protect the battery modules 500, ensuring a strong and stable overall structure of the battery pack and improving the safety performance of the battery pack. The bottom protective plate 120, the frame 130, and the cover plate 140 are respectively provided with corresponding first mounting holes 124, second mounting holes 131, and third mounting holes 141, and fasteners such as bolts are passed through the first mounting holes 124, second mounting holes 131, and third mounting holes 141 to connect and secure the bottom protective plate 120, the frame 130, and the cover plate 140.

[0028] In this embodiment, the buffer plate 122 and the connection support 123 are integrally injection molded on both sides of the base plate 121, so that when an adhesive film is laid on the bottom protective plate 120 during normal manufacturing, it is advantageous for reducing production costs and the thickness of the bottom protective plate 120, and it also makes it easier to adhere the subsequent bottom protective plate 120 to structures such as the frame 130 and external support. [Explanation of symbols]

[0029] 1 battery pack, 100 case body, 110 mounting chamber, 120 bottom protective plate, 121 base plate, 1211 infiltration hole, 122 buffer plate, 123 connection supporter, 124 first mounting hole, 130 frame, 131 second mounting hole, 140 cover plate, 141 third mounting hole, 150 pressure relief chamber, 200 reinforcing plate, 210 support portion, 220 connection portion, 230 buffer layer, 240 buffer passage, 300 buffer block, 400 bracket, 410 evacuation through hole, 500 battery module.

Claims

1. a bottom protective plate (120) on which a battery module (500) is placed, a reinforcing plate (200) provided on a side away from the battery module (500), and a buffer block (300) provided on a side facing the battery module (500); The buffer block (300) is provided between the battery module (500) and the bottom protective plate (120), and the reinforcing plate (200) has a plurality of support portions (210) that are alternately connected to each other and spaced apart from the bottom protective plate (120), and a plurality of connection portions (220) that abut against the bottom protective plate (120), and the buffer block (300) is provided corresponding to the positions of the connection portions (220). Case protective structure.

2. The bottom protective plate (120) comprises a substrate (121) having a plurality of infiltration holes (1211) passing through it, and two buffer plates (122) provided on both sides of the substrate (121) in the thickness direction, and a connection supporter (123) is provided in the infiltration holes (1211), and the two buffer plates (122) on both sides of the substrate (121) are connected via the connection supporter (123). The case protective structure according to claim 1.

3. The two buffer plates (122) on both sides of the base plate (121) are respectively fixedly connected to the connection supporters (123). The case protective structure according to claim 2.

4. The reinforcing plate (200) has a wave shape, and the protrusion on the side of the wave-shaped reinforcing plate (200) facing the bottom protective plate (120) is the connection portion (220), and the protrusion on the side facing away from the bottom protective plate (120) is the support portion (210), and a buffer passage (240) is formed between the support portion (210) and the bottom protective plate (120). The case protection structure according to claim 3.

5. A buffer layer (230) is provided on the side of the reinforcing plate (200) that faces away from the bottom protective plate (120). The case protection structure according to claim 4.

6. A plurality of the buffer blocks (300) are provided, and the plurality of buffer blocks (300) are distributed in a matrix. The case protection structure according to claim 5.

7. The battery module (500) further includes a bracket (400) provided between the battery module (500) and the buffer block (300), the bracket having a through-hole (410) corresponding to a pressure relief valve in the battery module (500). The case protection structure according to claim 6.

8. The bracket (400) and the bottom protective plate (120) are spaced apart via the buffer block (300) to form a pressure relief chamber (150), and the pressure relief valve communicates with the pressure relief chamber (150) via the evacuation through-hole (410). The case protection structure according to claim 7.

9. The case protection structure according to any one of claims 1 to 8 includes a case body (100) having a mounting chamber (110) in which a battery module (500) and a buffer block (300) are mounted. Battery pack.

10. The case body (100) further includes a frame (130) and a cover plate (140), and the bottom protection plate (120), the frame (130), and the cover plate (140) are connected to each other to form the sealed storage chamber (110). The battery pack according to claim 9.

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