Box protection structure and battery pack

Abstract

A box protection structure comprising a lower protection plate (120) on which a battery module (500) is placed, wherein a reinforcement plate (200) is provided on a side of the lower protection plate (120) facing away from the battery module (500), while a buffer block (300) is provided on a side of the lower protection plate (120) facing the battery module (500) and arranged between the battery module (500) and the lower protection plate (120), wherein the reinforcement plate (200) comprises a plurality of support portions (210) and a plurality of connecting portions (220) that are alternately connected to one another, wherein the support portion (210) and the lower protection plate (120) are arranged at intervals, the connecting portion (220) abuts against the lower protection plate (120), and the buffer block (300) is arranged at a position associated with the connecting portion (220).

Description

FIELD OF THE INVENTION

[0001] The present application relates to the technical field of battery devices, such as a box protection structure and a battery pack. STATE OF THE ART

[0002] With the rapid development of the new energy battery industry, battery safety requirements are becoming increasingly stringent. In the long-term use of an electric vehicle battery pack, the physical strength and impact resistance of the battery pack are becoming increasingly important. In general use, the bottom of the battery pack is tightly mounted on an external electrical device, such as an electric vehicle, so collisions and impacts of the battery pack generally originate from the bottom of the battery pack. DISCLOSURE OF THE INVENTIONTechnical Problem

[0003] The box structure of the battery pack is only designed in an ordinary way, and there is no special protection design for the bottom of the box structure, so the box structure only plays the role of supporting and containing the battery module, and the protection effect of the battery module is insufficient, which leads to the fact that a large number of new energy vehicles will experience ignition or even explosion due to the damage or destruction of the bottom of the box structure of the battery pack, which seriously endangers the life and property safety of drivers and passengers. Technical solution

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

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

[0006] In one aspect, a box protection structure is provided. It comprises a lower protection plate on which a battery module is placed, wherein a reinforcement plate is provided on a side of the lower protection plate facing away from the battery module, while a buffer block is provided on a side of the lower protection plate facing the battery module and arranged between the battery module and the lower protection plate, wherein the reinforcement plate comprises a plurality of support portions and a plurality of connecting portions alternately connected to each other, wherein the support portion and the lower protection plate are arranged at intervals, the connecting portion abuts against the lower protection plate, and the buffer block is arranged at a position associated with the connecting portion.

[0007] In another aspect, a battery pack is provided. It includes a box body including the above box protection structure and in which a receiving cavity for receiving the battery module and the buffer block is provided. Beneficial effects

[0008] Advantageous Effects of the Application: The box protection structure of the present application is provided with a reinforcement plate on the outer side of the bottom protection plate to effectively protect and reinforce the bottom protection plate. Thus, the impact resistance of the entire bottom structure of the box body is improved, effectively protecting the overall structural performance of the battery pack and ensuring the normal operation of the battery pack.Further, a buffer block is provided on a side of the lower protective plate facing the battery module, and the buffer block is arranged between the battery module and the lower protective plate, so that the buffer block achieves the effect of buffering and absorbing impact energy, realizes the effect of buffer energy absorption for the battery module, reduces the impact energy transmitted to the battery module after the lower protective plate is subjected to an impact, and reduces the severity and possibility of damage and destruction of the battery module. Thus, the effective protection of the battery module is realized.Accordingly, the buffer block is arranged at the connection position of the connecting portion of the reinforcement plate and the lower protective plate, and this position is on the force transmission path, which can improve the energy absorption efficiency of the buffer block and increase the protective performance of the entire structure. Presentation of the registration

[0009] In it show Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present application; Fig. 2 is a schematic exploded structural view of a box protection structure according to an embodiment of the present application; Fig. 3 is a schematic partial structural view of a side surface of a box protection structure according to an embodiment of the present application; Fig. 4 is a schematic structural sectional view of the box protection structure according to an embodiment of the present application; Fig. 5 an enlarged schematic structural view of the location A according to Fig. 4; Fig. 6 is a schematic structural sectional view of a lower guard plate according to an embodiment of the present application; Fig. 7 is a schematic structural view of a buffer plate and a connecting support according to an embodiment of the present application; Fig. 8 is a schematic structural view of a reinforcing plate according to an embodiment of the present application; Fig. 9 is a schematic structural diagram of a bracket according to an embodiment of the present application. Reference symbols:

[0010] 1, battery pack; 100, box body; 110, receiving cavity; 120, lower protection plate; 121, substrate; 1211, wetting hole; 122, buffer plate; 123, connecting support; 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, supporting portion; 220, connecting portion; 230, buffer layer; 240, buffer channel; 300, buffer block; 400, bracket; 410, avoidance through hole; 500, battery module. Embodiments of the invention

[0011] The present application is described in more detail below with reference to specific embodiments and the accompanying drawings. It is understood that the specific embodiments described serve only to explain the present application without limiting it. Furthermore, it should be noted that, to facilitate the description, only parts related to the application are shown in the accompanying drawings, rather than all structures.

[0012] In the present application, the terms "connected to one another," "connect," "fasten," or the like, unless expressly stated otherwise, are to be understood in a broad sense. For example, this can refer to a fixed, detachable, or one-piece connection, as well as a mechanical or electrical connection. Direct connections, indirect connections, or connections made via an intermediate piece, as well as internal connections between two elements or interactions between two elements are also conceivable. As a person of ordinary skill in the art, one can use the facts of the case to determine the intended meaning of the terms used in the present application.

[0013] In the present application, a first feature that is arranged "above" or "below" a second feature may, unless expressly stated and defined otherwise, mean that the first feature directly contacts the second feature, or that the first feature and the second feature are in contact without direct contact via a further feature arranged therebetween. Furthermore, the first feature that is arranged "on", "above" the second feature, and "above" the second feature may, among other things, mean that the first feature is directly above and diagonally above the second feature, or that the horizontal elevation of the first feature is higher than that of the second feature. The first feature that is arranged "below" the second feature and "below" the second feature may, among other things, mean thatIt may be the case that the first feature is directly below and diagonally below the second feature, or that the horizontal elevation of the first feature is lower than that of the second feature.

[0014] In the description of the present embodiment, the terms "top," "bottom," "left," "right," etc., are used with reference to the illustrated orientation or positional relationship in the respective illustration, merely to describe the operation and, where appropriate, to simplify the description. In other words, these terms neither implicitly nor explicitly indicate the positioning, design, and operation of the device or element in question in a predetermined position, so that this application is not limited here either. Furthermore, the terms "first" and "second," which have no particular meaning, are used merely to achieve a distinction in the description.

[0015] As in Fig. 1 to 9, a box protection structure according to the present embodiment includes a lower protection plate 120 on which a battery module 500 is placed. A reinforcement plate 200 is provided on a side of the lower protection plate 120 facing away from the battery module 500, while a buffer block 300 is provided on a side of the lower protection plate 120 facing the battery module 500 and disposed between the battery module 500 and the lower protection plate 120. The reinforcement plate 200 includes a plurality of support portions 210 and a plurality of connecting portions 220 alternately connected to each other. The support portion 210 and the lower protection plate 120 are arranged at intervals, the connecting portion 220 abuts against the lower protection plate 120, and the buffer block 300 is arranged at a position corresponding to the connecting portion 220.

[0016] In the present embodiment, by providing a reinforcement plate 200 on the outer side of the lower protective plate 120 to effectively protect and reinforce the lower protective plate 120, the impact resistance of the entire bottom structure of the box body 100 is improved to effectively protect the protective performance of the entire structure of the battery pack and ensure the normal operation of the battery pack.Further, a buffer block 300 is provided on a side of the lower protection plate 120 facing the battery module 500, and the buffer block 300 is arranged between the battery module 500 and the lower protection plate 120, so that the effect of buffering and absorbing impact energy is achieved by the buffer block 300, the effect of buffering energy absorption for the battery module 500 is realized, the impact energy transmitted to the battery module 500 after the lower protection plate 120 is subjected to an impact is reduced, and the severity and possibility of damage and destruction of the battery module 500 are reduced. Thus, the effective protection of the battery module 500 is realized.Accordingly, the buffer block 300 is arranged at the connecting position of the connecting portion 220 of the reinforcing plate 200 and the lower protective plate 120, and this position is on the force transmission path, whereby the energy absorption efficiency of the buffer block 300 can be improved and the protective performance of the entire structure can be increased.

[0017] As in Fig. As shown in Figures 6 to 7, in one embodiment, the lower protection plate 120 includes a substrate 121 and two buffer plates 122 arranged on two sides of the substrate 121 in its thickness direction. The substrate 121 is provided with a plurality of wetting holes 1211 penetrating the substrate 121, and a connecting post 123 is provided in the wetting hole 1211, via which the two buffer plates 122 on both sides of the substrate 121 are connected.At this time, the plurality of wetting holes 1211 are evenly distributed on the substrate 121 to ensure that the connection between the two buffer plates 122 on both sides of the substrate 121 and the connection support 123 is stable, and to ensure that the two buffer plates 122 on both sides of the substrate 121 are loaded as evenly as possible, which is conducive to improving the overall impact resistance of the lower protective plate 120 and improving the protective effect of the lower protective plate 120.

[0018] In one embodiment, the two buffer plates 122 on both sides of the substrate 121 are each firmly connected to the connecting support 123 to form a whole. The two buffer plates 122 on both sides of the substrate 121 and the connecting support 123 are formed by one-piece injection molding, ensuring that the protective structure consisting of the two buffer plates 122 on both sides of the substrate 121 and the connecting support 123 forms the lower protective plate 120 of a sandwich structure with the substrate 121, so that the lower protective plate 120 is stronger, the impact resistance of the lower protective plate 120 is improved, and the protective effect of the lower protective plate 120 is increased.

[0019] In actual use, 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 higher curing strength, so that the lower protective plate 120 can have better impact resistance to enhance the protective effect of the lower protective plate 120. Of course, in addition to the present embodiment, a buffer plate 122 made of other material structures can also be used as long as the impact resistance of the lower protective plate 120 can be improved to enhance the protective effect of the lower protective plate 120, and such a structure belongs to the scope of the present application.

[0020] In one embodiment, the reinforcement plate 200 is wave-shaped, with a projection of the wave-shaped reinforcement plate 200 facing toward the lower protection plate 120 being the connecting portion 220, while a projection of the reinforcement plate 200 facing away from the lower protection plate 120 is the supporting portion 210, with a buffer channel 240 formed between the supporting portion 210 and the lower protection plate 120. When the bottom of the battery pack is subjected to an impact, the supporting portion 210 faces outward and thus contacts the external device and is hit first. The impact force is transmitted to the connecting portion 220 along the junction of the supporting portion 210 and the connecting portion 220, and is then conducted through the connecting portion 220 to the lower protection plate 120, the buffer block 300, and the battery module 500 in sequence.This significantly reduces the impact on the battery module 500 through multi-layer protection when the bottom of the battery pack is subjected to an impact, which is conducive to protecting the battery module 500 from damage or destruction and ensuring the safety of the battery module 500. When an impact occurs on the support portion 210, since the buffer channel 240 is formed at intervals between the support portion 210 and the lower protective plate 120, the cushioning effect of the impact can be realized to some extent, and the impact force can be avoided from being directly transmitted through the support portion 210 to the lower protective plate 120.

[0021] In addition to the present embodiment, the reinforcing plate 200 may be used in other structural shapes such as pulse shape and the like as long as the protective and guiding effects of the reinforcing plate 200 can be realized in the present embodiment, and such structures are all within the scope of the present application.

[0022] In one embodiment, a side of the reinforcement plate 200 facing away from the lower protective plate 120 is provided with a buffer layer 230 to improve the impact resistance of the reinforcement plate 200 and the protective effect of the reinforcement plate 200 for the lower protective plate 120. The buffer layer 230 is a PVC buffer layer. A PVC buffer layer is sprayed onto the bottom of the reinforcement plate 200, which can effectively reduce noise and also achieve a certain buffering and energy absorption effect.

[0023] In one embodiment, the buffer block 300 is provided in a plurality, and the plurality of buffer blocks 300 are distributed in a matrix-like manner along the length direction within the receiving cavity 110, so that the impact energy transmitted from the connecting portion 220 can be uniformly absorbed by the buffer block 300 to avoid failure to achieve an effective protective effect due to poor local energy absorption effect.

[0024] In practice, the buffer block 300 is made of hard damping materials such as PU, EPP, EPA, or PPE, among others, so that the buffer block 300 exhibits excellent energy absorption performance. Of course, other energy-absorbing materials may also be used as long as the energy-absorbing properties and energy-absorbing effects of the buffer block 300 can be ensured, and such embodiments are all within the scope of the present application.

[0025] In one embodiment, the bracket 400 is further arranged in a receiving cavity 110. The bracket 400 is arranged between the battery module 500 and the buffer block 300. The battery module 500 is supported by the bracket 400, and the battery module 500 is placed on the bracket 400 and spaced between the buffer block 300 and the lower protective plate 120, so that the impact force transmitted to the battery module 500 after impacting the lower protective plate 120 can be effectively reduced. This is advantageous for improving the protective effect of the battery module 500. The bracket 400 is provided with an avoidance through-hole 410, which corresponds to a pressure relief valve on the battery module 500, to facilitate the installation and fastening of the battery module 500 and to avoid impairing the normal pressure relief of the battery module 500.

[0026] In one embodiment, the bracket 400 and the lower protection plate 120 are spaced apart by the buffer block 300 to form a pressure relief chamber 150, to which the pressure relief valve is connected via the avoidance through-hole 410. The pressure relief space of the battery module 500 is provided by the pressure relief chamber 150 to reduce expansion or even explosion and damage of the box body 100 due to excessive pressure in the receiving cavity 110 upon pressure relief in the battery module 500, thereby improving the safety performance of the battery pack.

[0027] As in Fig.1 to 9, the present embodiment further provides a battery pack 1. It includes a box body 100 including a box protection structure and in which an accommodation cavity 110 for accommodating the battery module 500 and the buffer block 300 is formed. In order to enable the box body 100 of the battery pack 1 in the present embodiment to have a good ground support and protection effect, so that the collision and impact from the bottom of the battery pack 1 can be effectively buffered and protected against, the influence of the collision and impact of this part on the battery module 500 inside the battery pack 1 is reduced, and the safety performance of the battery pack 1 is guaranteed.Ignition or even explosion of the battery pack due to damage or destruction of the bottom of the battery pack 1 is reduced, which is conducive to ensuring the safety of the life and property of the driver and passengers.

[0028] In one embodiment, the box body 100 further includes a frame 130 and a cover plate 140, wherein the lower protection plate 120, the frame 130, and the cover plate 140 are connected to each other to form the sealed accommodation cavity 110. The battery module 500 is tightly packaged and protected by the lower protection plate 120, the frame 130, and the cover plate 140 to ensure that the overall structure of the battery pack is strong and stable and to improve the safety performance of the battery pack. The lower protection plate 120, the frame 130, and the cover plate 140 are each provided with a first mounting hole 124, a second mounting hole 131, and a third mounting hole 141.By passing fasteners such as screws through the first mounting hole 124, the second mounting hole 131 and the third mounting hole 141, the connection and fixing of the lower guard plate 120, the frame 130 and the cover plate 140 are achieved.

[0029] In this embodiment, the structure of the buffer plate 122 and the connecting support 123 is formed by one-piece injection molding on both sides of the substrate 121, so that the situation where an adhesive film is applied to the lower protection plate 120 in normal manufacturing is conducive to reducing the production cost and the thickness of the lower protection plate 120. This is also suitable for subsequent bonding of the lower protection plate 120 and the frame 130 or external supports and other structures.

Claims

[1] A box protection structure comprising a lower protection plate (120) on which a battery module (500) is placed, wherein a reinforcement plate (200) is provided on a side of the lower protection plate (120) facing away from the battery module (500), while a buffer block (300) is provided on a side of the lower protection plate (120) facing the battery module (500) and arranged between the battery module (500) and the lower protection plate (120), wherein the reinforcement plate (200) comprises a plurality of support portions (210) and a plurality of connecting portions (220) which are alternately connected to one another, wherein the support portion (210) and the lower protection plate (120) are arranged at intervals, the connecting portion (220) abuts against the lower protection plate (120), and the buffer block (300) is arranged at a position associated with the connecting portion (220). [2] The box protection structure according to claim 1, wherein the lower protection plate (120) comprises a substrate (121) and two buffer plates (122) arranged on two sides of the substrate (121) in its thickness direction, the substrate (121) being provided with a plurality of wetting holes (1211) penetrating the substrate (121), a connecting post (123) being provided in the wetting hole (1211) for connecting the two buffer plates (122) on both sides of the substrate (121). [3] Box protection structure according to claim 2, wherein the two buffer plates (122) on both sides of the substrate (121) are each fixedly connected to the connecting support (123) into a whole. [4] The housing protection structure according to any one of claims 1 to 3, wherein the reinforcement plate (200) is wave-shaped, a projection of the wave-shaped reinforcement plate (200) facing the lower protection plate (120) being the connecting section (220), while a projection of the reinforcement plate (200) facing away from the lower protection plate (120) being the support section (210), a buffer channel (240) being formed between the support section (210) and the lower protection plate (120). [5] The housing protection structure according to any one of claims 1 to 4, wherein a side of the reinforcement plate (200) facing away from the lower protection plate (120) is provided with a buffer layer (230). [6] The housing protection structure according to any one of claims 1 to 5, wherein a plurality of buffer blocks (300) are provided and the plurality of buffer blocks (300) are distributed in a matrix-like manner. [7] A box protection structure according to any one of claims 1 to 6, further comprising a bracket (400) arranged between the battery module (500) and the buffer block (300), the bracket (400) being provided with an avoidance through-hole (410) associated with a pressure relief valve on the battery module (500). [8] A box protection structure according to claim 7, wherein the bracket (400) and the lower protection plate (120) are spaced apart from each other by the buffer block (300) to form a pressure relief chamber (150) to which the relief valve is connected via the avoidance through hole (410). [9] A battery pack comprising a box body (100) having a box protection structure according to claims 1 to 8 and a receiving cavity (110) for receiving the battery module (500) and the buffer block (300). [10] The battery pack according to claim 9, wherein the box body (100) further comprises a frame (130) and a cover plate (140), wherein the lower protective plate (120), the frame (130) and the cover plate (140) are connected to each other to form the sealed receiving cavity (110).

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