Case protection structure and battery pack

Abstract

Disclosed in the present application are a case protection structure and a battery pack. The case protection structure comprises a bottom protective plate, wherein a battery module is placed on the bottom protective plate; a reinforcing plate is provided on the side of the bottom protective plate facing away from the battery module; buffer blocks are provided on the side of the bottom protective plate facing toward the battery module, and the buffer blocks are arranged between the battery module and the bottom protective plate; and the reinforcing plate comprises a plurality of support portions and a plurality of connection portions, which are alternately distributed and connected to each other, the support portions being arranged spaced apart from the bottom protective plate, the connection portions abutting against the bottom protective plate, and the buffer blocks being arranged corresponding to the connection portions in terms of position.

Description

Box protection structure and battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 17, 2024, with application number 202421699134.2. The entire contents of the above application are incorporated by reference into this application.

[0002] Technical Field

[0003] The present application relates to the technical field of battery equipment, for example, to a box protection structure and a battery pack.

[0004] Background Art

[0005] With the rapid development of the new energy battery industry, battery safety requirements are becoming increasingly stringent. The physical strength and impact resistance of electric vehicle battery packs are becoming increasingly important over the long term. During typical use, the bottom of the battery pack is attached to external electrical equipment, such as the electric vehicle, so the primary impact and shock to the battery pack originates from the bottom of the pack.

[0006] Technical issues

[0007] The battery pack box structure only adopts an ordinary design, and there is no special protection design for the bottom of the box structure, so that the box structure only serves as a carrier and container for the battery module. The protection effect of the battery module is average. As a result, a large number of new energy vehicles have caused battery pack fires or even explosions due to damage or destruction of the bottom of the battery pack box structure, seriously endangering the lives and property of drivers and passengers.

[0008] Technical Solutions

[0009] The present application provides a box protection structure that can effectively improve the impact resistance of the bottom guard plate, thereby improving the protection effect on the battery module.

[0010] The present application provides a battery pack that can effectively improve the protection effect of the battery module and improve the safety of the entire battery pack.

[0011] On the one hand, a box protection structure is provided, including a bottom guard plate, a battery module is placed on the bottom guard plate, a reinforcement plate is provided on the side of the bottom guard plate facing away from the battery module, a buffer block is provided on the side of the bottom guard plate facing the battery module, the buffer block is arranged between the battery module and the bottom guard plate, the reinforcement plate includes a plurality of supporting parts and a plurality of connecting parts that are alternately distributed and connected to each other, the supporting parts are spaced apart from the bottom guard plate, the connecting parts abut against the bottom guard plate, and the buffer blocks are arranged at positions corresponding to the connecting parts.

[0012] On the other hand, a battery pack is provided, including a box body, the box body including the above-mentioned box protection structure, and a placement cavity for placing a battery module and a buffer block.

[0013] Beneficial effects

[0014] Beneficial effects of the present application: The box protection structure of the present application provides effective protection and reinforcement for the bottom guard plate by arranging a reinforcement plate on the outer side of the bottom guard plate, thereby improving the impact resistance of the overall bottom structure of the box body, thereby effectively protecting the protective performance of the overall structure of the battery pack and ensuring the normal operation of the battery pack. Among them, a buffer block is also provided on the side of the bottom guard plate facing the battery module, and the buffer block is arranged between the battery module and the bottom guard plate, so that the buffer block can achieve the effect of buffering and absorbing impact energy, realize the effect of buffering and absorbing energy of the battery module, reduce the impact energy transmitted to the battery module after the bottom guard plate is impacted, reduce the amplitude and possibility of damage and destruction of the battery module, and realize effective protection of the battery module. The buffer block is correspondingly arranged at the connection position between the connection part of the reinforcement plate and the bottom guard plate. This position is on the force conduction path, thereby improving the energy absorption efficiency of the buffer block and improving the protective performance of the overall structure.

[0015] BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic structural diagram of a battery pack provided in one embodiment of the present application;

[0017] FIG2 is a schematic diagram of an explosion structure of a box protection structure provided by an embodiment of the present application;

[0018] FIG3 is a schematic diagram of a partial structure of a side surface of a protective box provided by an embodiment of the present application;

[0019] FIG4 is a schematic cross-sectional view of a box protection structure provided in one embodiment of the present application;

[0020] FIG5 is an enlarged structural diagram of portion A in FIG4 ;

[0021] FIG6 is a schematic cross-sectional view of a bottom guard plate provided in one embodiment of the present application;

[0022] FIG7 is a schematic structural diagram of a buffer plate and a connecting bracket provided in one embodiment of the present application;

[0023] FIG8 is a schematic structural diagram of a reinforcement plate provided in one embodiment of the present application;

[0024] FIG9 is a schematic structural diagram of a bracket provided in an embodiment of the present application.

[0025] In the picture:

[0026] 1. Battery pack; 100. Box body; 110. Placement cavity; 120. Bottom guard plate; 121. Base plate; 1211. Wetting hole; 122. Buffer plate; 123. Connecting bracket; 124. First mounting hole; 130. Frame; 131. Second mounting hole; 140. Cover plate; 141. Third mounting hole; 150. Pressure relief chamber; 200. Reinforcement plate; 210. Support part; 220. Connecting part; 230. Buffer layer; 240. Buffer channel; 300. Buffer block; 400. Bracket; 410. Avoidance through hole; 500. Battery module.

[0027] Modes for Carrying Out the Invention

[0028] The present application will be described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended to explain the present application, not to limit it. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present application, not all structures.

[0029] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. A person of ordinary skill in the art will be able to understand the meaning of these terms in this application based on the circumstances.

[0030] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may indicate that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may indicate that the first feature is at a lower level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not have any special meanings.

[0032] As shown in Figures 1 to 9, a box protection structure of this embodiment includes a bottom guard plate 120, and a battery module 500 is placed on the bottom guard plate 120. A reinforcement plate 200 is provided on the side of the bottom guard plate 120 facing away from the battery module 500, and a buffer block 300 is provided on the side of the bottom guard plate 120 facing the battery module 500. The buffer block 300 is arranged between the battery module 500 and the bottom guard plate 120. The reinforcement plate 200 includes a plurality of supporting portions 210 and a plurality of connecting portions 220 that are alternately distributed and connected to each other. The supporting portions 210 are spaced apart from the bottom guard plate 120, and the connecting portions 220 abut against the bottom guard plate 120. The buffer block 300 is arranged corresponding to the position of the connecting portion 220.

[0033] In this embodiment, a reinforcement plate 200 is provided on the outside of the bottom guard plate 120 to effectively protect and reinforce the bottom guard plate 120, thereby improving the impact resistance of the overall bottom structure of the box body 100, thereby effectively protecting the protective performance of the overall structure of the battery pack and ensuring the normal operation of the battery pack. A buffer block 300 is also provided on the side of the bottom guard plate 120 facing the battery module 500, and the buffer block 300 is disposed between the battery module 500 and the bottom guard plate 120, so that the buffer block 300 can achieve the effect of buffering and absorbing impact energy, thereby achieving the effect of buffering and absorbing energy for the battery module 500, reducing the impact energy transmitted to the battery module 500 after the bottom guard plate 120 is impacted, reducing the possibility of damage and destruction to the battery module 500, and achieving effective protection for the battery module 500. The buffer block 300 is correspondingly arranged at the connection position between the connection portion 220 of the reinforcement plate 200 and the bottom guard plate 120. This position is on the force conduction path, thereby improving the energy absorption efficiency of the buffer block 300 and improving the protective performance of the overall structure.

[0034] In one embodiment, as shown in Figures 6 and 7, the bottom guard plate 120 includes a base plate 121 and two buffer plates 122 disposed on either side of the base plate 121 in the thickness direction. The base plate 121 is provided with a plurality of wetting holes 1211 penetrating the base plate 121. Connecting brackets 123 are disposed within the wetting holes 1211. The two buffer plates 122 on either side of the base plate 121 are connected by the connecting brackets 123. The plurality of wetting holes 1211 are evenly distributed on the base plate 121 to ensure a secure connection between the two buffer plates 122 on either side of the base plate 121 and the connecting brackets 123, ensuring that the two buffer plates 122 on either side of the base plate 121 are subjected to as uniform a force as possible, thereby improving the overall impact resistance of the bottom guard plate 120 and enhancing the protective effect of the bottom guard plate 120.

[0035] In one embodiment, the two buffer plates 122 on both sides of the substrate 121 are fixedly connected to the connecting bracket 123 to form an integral whole. The two buffer plates 122 on both sides of the substrate 121 and the connecting bracket 123 are integrally injection molded, which is conducive to ensuring that the protective structure composed of the two buffer plates 122 on both sides of the substrate 121 and the connecting bracket 123 forms a sandwich structure bottom guard plate 120 with the substrate 121. Such a bottom guard plate 120 structure is more solid, improves the impact resistance of the bottom guard plate 120, and improves the protective effect of the bottom guard plate 120.

[0036] In actual operation, the buffer plate 122 is a polyurethane buffer plate or a modified epoxy resin buffer plate. The polyurethane buffer plate and the modified epoxy resin buffer plate have strong polarity and high strength after curing, which can make the bottom guard plate 120 have better impact resistance, thereby improving the protective effect of the bottom guard plate 120. Of course, in addition to this embodiment, the buffer plate 122 of other materials and structures can also be used. As long as they can improve the impact resistance of the bottom guard plate 120 and improve the protective effect of the bottom guard plate 120, such designs are all within the scope of protection of this application.

[0037] In one embodiment, the reinforcing plate 200 is wavy in shape. The protrusion on the side of the wavy reinforcing plate 200 facing the bottom guard plate 120 is the connecting portion 220, and the protrusion on the side of the wavy reinforcing plate 200 away from the bottom guard plate 120 is the supporting portion 210. A buffer channel 240 is formed between the supporting portion 210 and the bottom guard plate 120. When the bottom of the battery pack is impacted, the supporting portion 210, which contacts the external device facing outward, is first impacted. The impact force is transmitted along the connection between the supporting portion 210 and the connecting portion 220 to the connecting portion 220, and then through the connecting portion 220 to the bottom guard plate 120, the buffer block 300, and the battery module 500. This layered protection greatly reduces the impact of the battery module 500 on the battery pack bottom when it is impacted, thereby protecting the battery module 500 from damage and ensuring its safety. Among them, when the support part 210 receives an impact, the buffer channel 240 formed by the interval between the support part 210 and the bottom guard plate 120 can achieve a certain degree of buffering effect on the impact, preventing the impact force from being directly transmitted to the bottom guard plate 120 through the support part 210.

[0038] In addition to this embodiment, other structural forms of the reinforcing plate 200, such as a pulse shape, may also be used. As long as the protection and conduction effects of the reinforcing plate 200 in this embodiment can be achieved, such designs fall within the scope of protection of this application.

[0039] In one embodiment, a buffer layer 230 is provided on the side of the reinforcing plate 200 facing away from the bottom guard plate 120 to enhance the impact resistance of the reinforcing plate 200 and improve its protective effect on the bottom guard plate 120. The buffer layer 230 is a PVC buffer layer, which is sprayed on the bottom of the reinforcing plate 200. This layer can effectively reduce noise and provide a certain buffering and energy absorption effect.

[0040] In one embodiment, a plurality of buffer blocks 300 are provided, and the plurality of buffer blocks 300 are distributed in a matrix in the placement cavity 110 along the length direction of the connection portion 220, so that the impact energy transmitted by the connection portion 220 can be uniformly absorbed by the buffer blocks 300, so as to avoid poor local energy absorption effect resulting in failure to achieve effective protection effect.

[0041] In actual operation, the buffer block 300 is made of a hard buffer material, such as PU, EPP, EPA, or PPE, which makes the buffer block 300 have an excellent energy absorption effect. Of course, other energy absorption materials can also be used, as long as the energy absorption properties and energy absorption effect of the buffer block 300 are guaranteed, and such designs fall within the scope of protection of this application.

[0042] In one embodiment, a bracket 400 is further included. The bracket 400 is disposed within the placement cavity 110 and between the battery module 500 and the buffer block 300. The bracket 400 supports the battery module 500 and allows the battery module 500 to be placed on the bracket 400 and spaced from the bottom guard plate 120 via the buffer block 300. This effectively reduces the impact force transmitted to the battery module 500 after the bottom guard plate 120 is impacted, thereby improving the protection effect of the battery module 500. The bracket 400 is provided with an avoidance through-hole 410 corresponding to the pressure relief valve on the battery module 500 to facilitate the installation and fixation of the battery module 500 and avoid affecting the normal pressure relief of the battery module 500.

[0043] In one embodiment, a buffer block 300 is provided between the bracket 400 and the bottom guard plate 120 to form a pressure relief chamber 150. The pressure relief valve communicates with the pressure relief chamber 150 via a relief hole 410. The pressure relief chamber 150 provides space for pressure relief of the battery module 500. This reduces the risk of excessive pressure within the placement chamber 110, which could cause expansion or even explosion and damage of the box body 100 when pressure relief from the battery module 500 occurs, thereby improving the safety of the battery pack.

[0044] As shown in Figures 1 to 9, this embodiment further provides a battery pack 1, comprising a housing 100 including a housing protection structure. A cavity 110 is defined within the housing 100 for accommodating a battery module 500 and a buffer block 300. This provides the housing 100 of the battery pack 1 in this embodiment with excellent bottom support and protection, effectively buffering and protecting against collisions and impacts from the bottom of the battery pack 1, reducing the impact of these collisions and impacts on the battery modules 500 within the battery pack 1, ensuring the safety of the battery pack 1, and reducing the risk of fire or even explosion of the battery pack 1 due to damage or destruction to the bottom of the battery pack 1, thereby protecting the lives and property of the driver and passengers.

[0045] In one embodiment, the box body 100 further includes a frame 130 and a cover 140. The bottom guard plate 120, the frame 130, and the cover 140 are interconnected to form a sealed placement chamber 110. The battery module 500 is loaded, sealed, and protected by the bottom guard plate 120, the frame 130, and the cover 140, ensuring the overall structure of the battery pack is strong and stable, thereby improving the safety performance of the battery pack. The bottom guard plate 120, the frame 130, and the cover 140 are respectively provided with corresponding first mounting holes 124, second mounting holes 131, and third mounting holes 141. The bottom guard plate 120, the frame 130, and the cover 140 are connected and fixed by fasteners such as bolts passing through the first mounting frame, the second mounting holes 131, and the third mounting holes 141.

[0046] In this embodiment, the buffer plate 122 and the connecting bracket 123 are integrally formed by injection molding on both sides of the base plate 121, so that a film can be laid on the bottom guard plate 120 during normal manufacturing, which is beneficial to reducing the production cost and the thickness of the bottom guard plate 120, and also facilitates the subsequent gluing of the bottom guard plate 120 to structures such as the frame 130 or external brackets.

Claims

1. A box protection structure, comprising a bottom guard plate (120), a battery module (500) being placed on the bottom guard plate (120), a reinforcing plate (200) being provided on a side of the bottom guard plate (120) facing away from the battery module (500), a buffer block (300) being provided on a side of the bottom guard plate (120) facing the battery module (500), the buffer block (300) being arranged between the battery module (500) and the bottom guard plate (120), the reinforcing plate (200) comprising a plurality of supporting portions (210) and a plurality of connecting portions (220) being alternately connected to each other, the supporting portions (210) being arranged at intervals from the bottom guard plate (120), the connecting portions (220) being in contact with the bottom guard plate (120), and the buffer block (300) being arranged corresponding to the position of the connecting portion (220).

2. The box protection structure according to claim 1, wherein: The bottom guard plate (120) comprises a base plate (121) and two buffer plates (122) arranged on both sides of the base plate (121) in a thickness direction; the base plate (121) is provided with a plurality of wetting holes (1211) penetrating the base plate (121); a connecting bracket (123) is arranged in the wetting holes (1211); and the two buffer plates (122) on both sides of the base plate (121) are connected via the connecting bracket (123).

3. The box protection structure according to claim 2, wherein: The two buffer plates (122) on both sides of the base plate (121) are respectively fixedly connected to the connecting bracket (123) to form an integral whole.

4. The box protection structure according to any one of claims 1 to 3, wherein: The reinforcing plate (200) is wavy in shape, a protrusion on the side of the wavy reinforcing plate (200) facing the bottom guard plate (120) is the connecting portion (220), a protrusion on the side of the wavy reinforcing plate (200) away from the bottom guard plate (120) is the supporting portion (210), and a buffer channel (240) is formed between the supporting portion (210) and the bottom guard plate (120).

5. The box protection structure according to any one of claims 1 to 4, wherein: A buffer layer (230) is provided on the side of the reinforcement plate (200) facing away from the bottom guard plate (120).

6. The box protection structure according to any one of claims 1 to 5, wherein: A plurality of the buffer blocks (300) are provided, and the plurality of buffer blocks (300) are distributed in a matrix.

7. The box protection structure according to any one of claims 1 to 6, further comprising a bracket (400), wherein the bracket (400) is arranged between the battery module (500) and the buffer block (300), and the bracket (400) is provided with an avoidance through hole (410) corresponding to the pressure relief valve on the battery module (500).

8. The box protection structure according to claim 7, wherein: The bracket (400) and the bottom guard plate (120) are spaced apart by the buffer block (300) to form a pressure relief chamber (150), and the pressure relief valve is in communication with the pressure relief chamber (150) via the avoidance through hole (410).

9. A battery pack, comprising a box body (100), the box body (100) comprising the box protection structure according to any one of claims 1 to 9, and a placement cavity (110) for placing a battery module (500) and a buffer block (300) is provided in the box body (100).

10. The battery pack according to claim 9, wherein: The box body (100) further comprises a frame (130) and a cover plate (140); the bottom guard plate (120), the frame (130) and the cover plate (140) are connected to each other to form the sealed placement cavity (110).

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