Battery pack box and battery pack

Abstract

This invention provides a battery pack housing and a battery pack, relating to the field of battery technology. The battery pack includes a housing, which comprises a housing frame. A structural reinforcement is disposed on the inner side of the housing frame, the structural reinforcement being connected to the housing frame. The structural reinforcement has a receiving cavity communicating with the inner space of the housing frame, the receiving cavity being configured to accommodate expanding foam. Based on the technical solution provided by this invention, not only can the overall rigidity and strength of the battery pack be improved, extending the service life of the battery pack, but also the safety performance of the battery pack can be enhanced.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery pack housing and a battery pack. Background Technology

[0002] Inside the battery pack, battery modules are typically bonded to the battery pack housing using expanding foam. However, in related technologies, due to poor bonding strength between the expanding foam and the battery pack housing frame, the expanding foam is insufficient in areas such as the inner cavity and corners of the battery pack housing, thus affecting the overall rigidity and strength of the battery pack.

[0003] Therefore, improving the overall stiffness and strength of the battery pack is one of the urgent problems to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a battery pack housing and a battery pack, which improves the overall rigidity and strength of the battery pack by providing structural reinforcement members inside the housing frame and cooperating with the receiving cavity provided on the structural reinforcement members.

[0005] In a first aspect, embodiments of the present invention provide a battery pack housing and a battery pack, including a housing frame, a structural reinforcement member provided on the inner side of the housing frame, the structural reinforcement member being connected to the housing frame, and the structural reinforcement member being provided with a receiving cavity communicating with the inner space of the housing frame, the receiving cavity being configured to receive at least a portion of the expanding foam.

[0006] In some embodiments, the box frame includes a plurality of interconnected side beams; the structural reinforcement includes a plurality of inner side beams, the plurality of inner side beams being respectively fixedly disposed on one of the side beams.

[0007] In some embodiments, the accommodating cavity includes a first accommodating cavity disposed on the inner side beam, the first accommodating cavity extending along the inner side beam and communicating with the inner space of the box frame.

[0008] In some embodiments, the inner edge beam includes:

[0009] A first connecting portion is configured to connect to the corresponding edge beam; and

[0010] The first bend is connected to the side of the first connecting part away from the corresponding edge beam;

[0011] The first bent portion and the corresponding side beam together form the first receiving cavity. A first opening is also formed between the first bent portion and the corresponding side beam. The first opening communicates with the first receiving cavity and is configured to allow expanding foam to enter the first receiving cavity.

[0012] In some embodiments, the structural reinforcement further includes an inner beam disposed inside the box frame, with each end of the inner beam connected to one of the side beams.

[0013] In some embodiments, the accommodating cavity further includes a second accommodating cavity disposed on the inner beam, the second accommodating cavity extending along the inner beam and communicating with the inner space of the box frame.

[0014] In some embodiments, the inner beam includes:

[0015] The main connecting part is connected to one of the side beams at each end;

[0016] The second connecting part is fixedly disposed on the main connecting part and extends along the main connecting part;

[0017] The third connecting portion is vertically fixed to the side of the second connecting portion away from the main connecting portion and extends along the main connecting portion; and

[0018] Two second bends are respectively disposed on opposite sides of the third connecting portion;

[0019] The second accommodating cavity is formed between the two second bends and the second connecting portion; a second opening is also formed between the second bend and the second connecting portion, the second opening communicates with the second accommodating cavity, and the second opening is configured to allow the expanding foam to enter the second accommodating cavity.

[0020] In some embodiments, the structural reinforcement has a plurality of vent holes, which are connected to the accommodating cavity, and the plurality of vent holes and the inlet of the expanding foam on the structural reinforcement are respectively located on opposite sides of the structural reinforcement.

[0021] In some embodiments, the battery pack housing further includes a bottom protective plate connected to the housing frame, the bottom protective plate comprising:

[0022] Base plate;

[0023] A buffer layer is provided on the side of the base plate near the box frame;

[0024] A metal plate is disposed on the side of the buffer layer opposite to the base plate; and

[0025] An insulating plate is disposed on the side of the metal plate opposite to the buffer layer.

[0026] In some embodiments, the bottom protective plate is provided with a plurality of elastic supports on the side of the inner space of the box frame.

[0027] In some embodiments, pressure relief cavities are provided on opposite sides of the housing frame, and multiple pressure relief holes are also provided on the housing frame; each pressure relief cavity is connected to at least one of the pressure relief holes.

[0028] In some embodiments, the pressure relief chamber is located on the side of the side beam near the bottom guard plate, and a pressure relief gap is formed between the side beam and the bottom guard plate, the pressure relief gap being configured to communicate with the inner space of the box frame.

[0029] In some embodiments, the top recess of the housing frame is provided with a top groove, the width of the upper opening of the top groove is greater than the width of its bottom, and the top groove is configured to accommodate sealant.

[0030] In some embodiments, a reinforcing plate is further provided on the inner side of the box frame. The reinforcing plate is obliquely fixed to the side beam near the inner side of the box frame, and a first opening is formed between the reinforcing plate and the inner side beam on the corresponding side.

[0031] Secondly, embodiments of the present invention also provide a battery pack, including the battery pack housing described above.

[0032] The beneficial effects of the embodiments of the present invention are as follows:

[0033] In embodiments of the present invention, by providing structural reinforcement members on the inner side of the housing frame, the gap between the foam and the side beam can be reduced, making the foaming more concentrated. Simultaneously, a receiving cavity is provided on the structural reinforcement member, connecting to the inner space of the housing frame, allowing the foam to enter the receiving cavity, thereby increasing the bonding area between the foam and the housing frame, thus improving the overall rigidity and strength of the battery pack. The bottom protective plate adopts a multi-layer composite structure design, combined with multiple elastic support members provided on the bottom protective plate, enhancing the scratch resistance of the bottom of the battery pack, improving the protection of the internal structure and components of the battery pack housing, and helping to extend the service life of the battery pack. Furthermore, a pressure relief cavity is provided on the housing frame, combined with multiple pressure relief holes provided at the bottom of the housing frame, allowing the cells located at different positions inside the battery pack housing to be fully depressurized, thereby improving the safety performance of the battery pack. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is an isometric schematic diagram of the battery pack housing (with the housing cover removed) in one embodiment of the present invention;

[0036] Figure 2 This is an isometric schematic diagram of the first side beam in one embodiment of the present invention;

[0037] Figure 3 This is a schematic cross-sectional view of the first side beam in one embodiment of the present invention;

[0038] Figure 4 This is an isometric schematic diagram of the inner beam in one embodiment of the present invention;

[0039] Figure 5 This is a schematic cross-sectional view of the inner beam in one embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the bottom protective plate in one embodiment of the present invention.

[0041] Reference numerals: 100, box frame; 110, first side beam; 111, top groove; 112, reinforcing plate; 120, second side beam; 130, third side beam; 140, fourth side beam; 200, bottom protective plate; 210, bottom plate; 220, buffer layer; 230, metal plate; 240, insulating plate; 300, pressure relief chamber; 310, pressure relief hole; 320, pressure relief gap; 400, inner side beam; 410, first connecting part; 420, first bending part; 421, transition connecting part; 422, hook part; 500, first accommodating cavity; 510, first opening; 600, vent hole; 700, inner beam; 710, main body connecting part; 720, second connecting part; 730, third connecting part; 740, second bending part; 800, second accommodating cavity; 810, second opening; 900, elastic support member. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0043] Inside the battery pack, battery modules are typically bonded to the battery pack housing using expanding foam. However, in related technologies, due to poor bonding strength between the expanding foam and the battery pack housing frame, the expanding foam is insufficient in areas such as the inner cavity and corners of the battery pack housing, thus affecting the overall rigidity and strength of the battery pack.

[0044] Example 1

[0045] See appendix Figure 1 To address the aforementioned technical problems, this invention provides a battery pack housing, including a housing frame 100, a bottom protective plate 200, and a housing cover (not shown in the figure). The bottom protective plate 200 is fixedly connected to the bottom of the housing frame 100, and the housing cover can be fixed to the top of the housing frame 100. In practical applications, battery modules can be installed on the bottom protective plate 200, and the battery modules can be bonded and fixed to the battery pack housing using expanding foam. The housing cover can close the top opening of the battery pack housing, thereby forming a stable battery pack structure.

[0046] In this embodiment, the box frame 100 can be configured as a quadrilateral frame structure, which includes four interconnected side beams. The four side beams are connected end to end in sequence and can be fixedly connected by welding or bolts.

[0047] For ease of description, the two side beams arranged opposite each other among the four side beams can be defined as the first side beam 110 and the second side beam 120; correspondingly, the other two side beams are defined as the third side beam 130 and the fourth side beam 140. The first side beam 110 and the second side beam 120 are parallel to each other and of equal length, the third side beam 130 and the fourth side beam 140 are parallel to each other and of equal length, and the lengths of the first side beam 110 and the second side beam 120 can be greater than the lengths of the third side beam 130 and the fourth side beam 140.

[0048] See appendix Figure 2-3 In this embodiment, to facilitate pressure relief of the battery cell, the first side beam 110 can be made of a hollow profile with open ends, and its interior forms a pressure relief cavity 300 for pressure relief. Simultaneously, multiple pressure relief holes 310 can be formed on the side of the first side beam 110 near the bottom protective plate 200, and these holes 310 can be evenly spaced along the length of the first side beam 110. The specific number of pressure relief holes 310 can be flexibly optimized as needed; for example, two, three, or more pressure relief holes 310 can be provided, without specific limitation.

[0049] Meanwhile, a top groove 111 can be provided on the top surface of the first side beam 110 (i.e., the surface facing away from the bottom protective plate 200). The top groove 111 can extend along the length of the first side beam 110 and can be located at the middle of the top surface of the first side beam 110. Preferably, the width of the upper opening of the top groove 111 is greater than the width of its bottom. The top groove 111 can be used to fill sealant, and its structure of a large opening and a small bottom can also help guide the sealant to flow in, so as to ensure the sealing between the box frame and the box cover. Moreover, a diagonally fixed reinforcing plate 112 can be provided on the side of the first side beam 110 near the inner side of the box frame. The reinforcing plate 112 can effectively improve the structural strength of the first side beam 110.

[0050] It should be noted that, in order to ensure smooth pressure relief during cell explosion, a height difference is provided between the position of the first side beam 110 corresponding to the aforementioned pressure relief chamber 300 and the lower bottom protective plate 200. That is, a pressure relief gap 320 is reserved between the position of the lower surface of the first side beam 110 corresponding to the pressure relief chamber 300 and the bottom protective plate 200, so as to ensure that the gas can enter the pressure relief hole 310 through the pressure relief gap 320 and finally complete the pressure relief.

[0051] Similarly, the above-mentioned structural design can also be adopted on the second side beam 120. That is, the second side beam 120 can also be provided with a pressure relief chamber 300 and multiple pressure relief holes 310, referring to the first side beam 110. The specific arrangement is as described in the relevant description of the first side beam 110, and will not be repeated here.

[0052] Based on the above structural design of the first side beam 110 and the second side beam 120, by setting pressure relief holes 310 on the first side beam 110 and the second side beam 120, the pressure relief holes 310 can connect the pressure relief chamber 300 with the inner space of the housing frame 100; when the cells inside the battery pack experience thermal runaway, gas can enter the pressure relief chamber 300 through the pressure relief holes 310 and be discharged through the pressure relief chamber 300 to achieve pressure relief.

[0053] Furthermore, since the pressure relief cavities 300 and multiple pressure relief holes 310 on the first side beam 110 and the second side beam 120 are symmetrically arranged, the distance between the battery cells at different positions and the adjacent pressure relief holes 310 is relatively balanced, ensuring that the battery cells at different positions can be fully depressurized.

[0054] See appendix Figure 1-2 In this embodiment, to improve the rigidity of the battery pack housing, a structural reinforcement is provided on the inner side of the housing frame 100, and the structural reinforcement is fixedly connected to the inner side of the housing frame 100. By providing a structural reinforcement on the inner side of the housing frame 100, the structural reinforcement can reduce the gap inside the battery pack housing and increase the rigidity of the battery pack housing.

[0055] Specifically, the structural reinforcement includes three inner side beams 400, which can be fixedly mounted on one of the side beams. For example, the three inner side beams 400 can be respectively mounted on the first side beam 110, the second side beam 120, and the third side beam 130. By mounting the inner side beams 400 on the first side beam 110, the second side beam 120, and the third side beam 130, the internal gap of the battery pack can be reduced, and the bonding area between the housing frame 100 and the foam can be increased.

[0056] In this embodiment, the three inner side beams 400 can adopt the same structure and arrangement, the only difference being that the three inner side beams 400 are respectively arranged on the first side beam 110, the second side beam 120, and the third side beam 130. Therefore, for ease of description, the following description will focus on the inner side beam 400 corresponding to the first side beam 110 as an example to describe the structure and arrangement of the inner side beam 400.

[0057] Specifically, taking the inner side beam 400 corresponding to the first side beam 110 as an example, the inner side beam 400 is disposed on the inner side wall of the first side beam 110 and fixedly connected to the first side beam 110. The inner side beam 400 and the first side beam 110 can be fixed by welding, or by a detachable connection such as bolts or riveting; no specific limitation is made. See Appendix Figure 2-3 In this embodiment, the inner side beam 400 can be arranged parallel to the first side beam 110, that is, the inner side beam 400 can extend along the length direction of the first side beam 110 and be fixedly connected to the inner side wall of the first side beam 110.

[0058] Specifically, the aforementioned inner side beam 400 includes a first connecting portion 410 and a first bending portion 420; wherein, the first connecting portion 410 can be vertically fixed to the inner side wall of the first side beam 110, while the first bending portion 420 is disposed on the side of the first connecting portion 410 away from the first side beam 110. The first bending portion 420 and the first connecting portion 410 can be integrally formed, or they can be two independent components connected to each other, but considering structural stability, the first bending portion 420 and the first connecting portion 410 are preferably integrally formed.

[0059] The first bending portion 420 can be configured as a "claw"-like structure. For example, in one embodiment, the first bending portion 420 may include a transition connecting portion 421 for connecting the first connecting portion 410 and a claw portion 422 disposed on the side of the transition connecting portion 421 away from the first connecting portion 410. The transition connecting portion 421 is connected to the side of the first connecting portion 410 away from the first side beam 110 and bends toward the side where the bottom guard plate 200 is located. The claw portion 422 is bent into shape on the side of the transition connecting portion 421 away from the first connecting portion 410 and bends toward the side where the first side beam 110 is located.

[0060] At this time, a first receiving cavity 500 is formed between the first bent portion 420 and the inner wall of the first side beam 110, and a first opening 510 is also formed between the hook portion 422 and the inner wall of the first side beam 110. The first opening 510 connects to the first receiving cavity 500 and can be used to allow expanding foam to enter the first receiving cavity 500, so that the expanding foam can complete foaming in the first receiving cavity 500 and achieve bonding and fixation with the first side beam 110. By configuring the inner side beam 400 into a structure combining the first connecting part 410 and the first bending part 420, the foam can enter the first accommodating cavity 500 and complete foaming. This not only increases the bonding area between the housing frame 100 and the foam, but also, after foaming, the inner side beam 400 and the foam can form a constraint in the direction perpendicular to the bottom guard plate 200 and in the direction perpendicular to the inner side wall of the first side beam 110, thereby further increasing the connection strength between the battery pack and the foam and improving the overall rigidity of the battery pack.

[0061] It should be noted that in this embodiment, the inner side beam 400 can be disposed on the same side of the first side beam 110 as the reinforcing plate 112, and the inner side beam 400 can be disposed exactly above the reinforcing plate 112, so that the gap between the inner side beam 400 and the reinforcing plate 112 below forms the first opening 510. In this way, the reinforcing plate 112 can not only improve the structural strength of the first side beam 110, but also guide the foaming adhesive, allowing the foaming adhesive to smoothly enter the first accommodating cavity 500 through the first opening 510 and complete the foaming.

[0062] In this embodiment, to ensure that the expanding foam can fully expand in the first accommodating cavity 500, a plurality of vent holes 600 are also provided on the inner side beam 400. Specifically, the plurality of vent holes 600 can be evenly spaced along the length direction of the inner side beam 400; and the vent holes 600 and the first opening 510 can be respectively provided on opposite sides of the inner side beam 400; for example, the first opening 510 can be provided on the lower side of the inner side beam 400 (i.e., the side close to the bottom protective plate 200), while the vent holes 600 can be provided on the upper side of the inner side beam 400 (i.e., the side of the inner side beam 400 away from the bottom protective plate 200).

[0063] By providing multiple vent holes 600 on the inner side beam 400, after the expanding foam enters the first receiving cavity 500 through the first opening 510, the gas in the first receiving cavity 500 can be discharged through the vent holes 600 as the expanding foam continues to foam. During this process, the expanding foam gradually fills the first receiving cavity 500 from bottom to top, thereby ensuring that the expanding foam can fully fill the first receiving cavity 500 to increase the bonding area between the expanding foam and the inner side beam 400. Furthermore, the foaming height of the expanding foam should be lower than the maximum height of the inner side beam 400 to avoid the expanding foam blocking the vent holes 600, ensuring that the gas can be stably discharged from the vent holes 600.

[0064] In this embodiment, the inner beam 400 can be a single component or a combination of multiple components.

[0065] When the inner side beam 400 adopts a single component structure, the inner side beam 400 is fixedly connected to the first side beam 110, and both ends of the inner side beam 400 can extend toward the third side beam 130 and the fourth side beam 140 on both sides, ensuring that there is a gap between the end of the inner side beam 400 and the adjacent side beam, so that the foam at the corner position can enter the first accommodating cavity 500.

[0066] When the inner side beam 400 adopts a structure composed of multiple components, the inner side beam 400 can be divided into multiple segments along the length direction of the first side beam 110. Similarly, both ends of the inner side beam 400 extend toward the third side beam 130 and the fourth side beam 140 on both sides, respectively. Its arrangement is similar to that of the case where the inner side beam 400 adopts a single component. The difference is that a gap will be formed between each segment of the inner side beam 400. This gap allows the foaming adhesive to enter the first accommodating cavity 500 and achieve foaming and bonding.

[0067] In this embodiment, the other two inner side beams 400 are respectively disposed on the second side beam 120 and the third side beam 130, and their specific structure and arrangement can be set with reference to the inner side beam 400 on the first side beam 110, which will not be described in detail here.

[0068] It should be noted that in this embodiment, three inner side beams 400 are provided, and the three inner side beams 400 are respectively fixed on the first side beam 110, the second side beam 120, and the third side beam 130. However, the number of inner side beams 400 can actually be flexibly optimized according to needs. For example, four inner side beams 400 can also be provided, and the four inner side beams 400 are respectively fixed on the four side beams; or, only one inner side beam 400 can be provided, in which case the inner side beam 400 can be fixed on one of the side beams; or, two inner side beams 400 can be provided, and the two inner side beams 400 are respectively fixed on the first side beam 110 and the second side beam 120. Therefore, the number of inner side beams 400 can actually be set to one, two, three, or four, and there is no specific limitation.

[0069] See appendix Figure 1 In this embodiment, the structural reinforcement also includes an inner beam 700 disposed inside the box frame 100, and the two ends of the inner beam 700 can be connected to two side beams disposed opposite to each other therein.

[0070] By further providing an inner beam 700 on the inner side of the housing frame 100, the internal gap of the housing can be further reduced, and the bonding area between the housing frame 100 and the foam can be increased, thereby improving the rigidity of the battery pack housing.

[0071] In this embodiment, the inner beam 700 is disposed on the inner side of the box frame 100. The upper and lower sides of the inner beam 700 can be fixedly connected to the box cover plate and the bottom guard plate 200 respectively, and the two ends of the inner beam 700 can be connected to the third side beam 130 and the fourth side beam 140 respectively, so that the inner beam 700 is stably mounted on the inner side of the box frame 100.

[0072] By further providing an inner beam 700 on the inner side of the housing frame 100, the inner beam 700 divides the inner space of the housing frame 100 into two parts, further reducing the gap inside the battery pack housing and increasing the bonding area between it and the foam.

[0073] See appendix Figure 4-5In this embodiment, the inner beam 700 includes a main connecting portion 710, the lower side of which is fixedly connected to the bottom protective plate 200, and its two ends are respectively connected to the third side beam 130 and the fourth side beam 140. A second connecting portion 720 is provided on the upper side of the main connecting portion 710 (i.e., the side of the main connecting portion 710 facing away from the bottom protective plate 200). The second connecting portion 720 can be vertically fixed to the main connecting portion 710, and its two ends extend toward the third side beam 130 and the fourth side beam 140 respectively. A third connecting portion 730 is also provided on the second connecting portion 720, the third connecting portion 730 being vertically fixed to the side of the second connecting portion 720 away from the main connecting portion 710, and its two ends also extend toward the third side beam 130 and the fourth side beam 140 respectively. The third connecting part 730 is provided with a second bending part 740 on both sides. The two second bending parts 740 can be integrally bent and formed on both sides of the third connecting part 730, and the two ends of the second bending parts 740 extend toward the third side beam 130 and the fourth side beam 140 respectively.

[0074] The second bending portion 740 can adopt the same structural form as the first bending portion 420, that is, the second bending portion 740 can adopt the same "claw" structure as the first bending portion 420, which also includes a similar transition connection portion 421 and claw portion 422; specifically, the arrangement of the second bending portion 740 on the third connection portion 730 can refer to the arrangement of the first bending portion 420 mentioned above, and will not be repeated here.

[0075] By providing a third connecting portion 730 on the second connecting portion 720, and providing second bending portions 740 on opposite sides of the third connecting portion 730, a second receiving cavity 800 is formed between the second bending portions 740 and the second connecting portion 720. A second opening 810 is also formed between the hook portion 422 of the second bending portion 740 and the second connecting portion 720. The second opening 810 communicates with the second receiving cavity 800, and the foaming adhesive can enter the second receiving cavity 800 through the second opening 810 and complete foaming in the second receiving cavity 800, thereby achieving bonding and fixation with the inner beam 700.

[0076] Meanwhile, by setting the inner beam 700 in the above-mentioned structural form, the foam can be foamed in the second accommodating cavity 800; thus, not only can the bonding area between the battery pack body and the foam be further increased, but also after foaming, the inner beam 700 and the foam can form a constraint in the direction perpendicular to the bottom guard plate 200 and in the direction perpendicular to the second connecting part 720, thereby further improving the connection strength between the battery pack body and the foam, so as to improve the overall rigidity of the battery pack.

[0077] In this embodiment, to ensure that the expanding foam can fully expand in the second accommodating cavity 800, multiple vent holes 600 can also be provided on the inner beam 700. Specifically, the multiple vent holes 600 can be formed on the third connecting part 730; in this case, the multiple vent holes 600 and the aforementioned second opening 810 are arranged vertically and vertically on the inner beam 700.

[0078] Thus, after the expanding foam enters the second receiving cavity 800 through the second opening 810, as the expanding foam continues to expand, the gas in the second receiving cavity 800 can be discharged from the vent 600. During this process, the expanding foam gradually fills the second receiving cavity 800 from bottom to top, thereby ensuring that the expanding foam can fully fill the second receiving cavity 800 to increase the bonding area between the expanding foam and the inner beam 700. Similarly, the foaming height of the expanding foam here should also be lower than the maximum height of the inner beam 700 to avoid the expanding foam blocking the vent 600 on the inner beam 700, so as to ensure that the gas can be stably discharged from the vent 600.

[0079] It should be noted that only one inner beam 700 is provided in this embodiment, but two or more inner beams 700 can actually be provided as needed; for example, when two inner beams 700 are provided, the two inner beams 700 can be arranged in parallel and spaced apart on the inner side of the box frame 100. Therefore, the specific number of inner beams 700 is not specifically limited here, and can be flexibly optimized according to needs.

[0080] Meanwhile, based on the above description of the structural reinforcement, it can be seen that the structural reinforcement in this embodiment includes multiple inner side beams 400 and inner beams 700. Both the inner side beams 400 and inner beams 700 are provided with accommodating cavities (first accommodating cavity 500 and second accommodating cavity 800), openings (first opening 510 and second opening 810) communicating with the accommodating cavities, and vent holes 600. The expanding foam can enter the accommodating cavity through the openings and gradually fill the corresponding accommodating cavity, allowing gas to be discharged from the vent holes 600, ultimately completing foaming within the accommodating cavity. Since both the first bending portion 420 and the second bending portion 740 adopt the aforementioned "claw" structure, multi-directional constraints will be generated between the expanding foam and the inner side beams 400 and inner beams 700, thereby improving the connection strength between the battery pack housing and the expanding foam to ensure the overall rigidity of the battery pack.

[0081] See appendix Figure 1 and attached Figure 6In this embodiment, the bottom protective plate 200 can adopt a multi-layer composite structure. Specifically, the bottom protective plate 200 includes a bottom plate 210, a buffer layer 220 disposed on the bottom plate 210, a metal plate 230 disposed on the side of the buffer layer 220 opposite to the bottom plate 210, and an insulating plate 240 disposed on the side of the metal plate 230 opposite to the buffer layer 220. In actual installation, the bottom protective plate 200 abuts against the housing frame 100 through the insulating plate 240.

[0082] By configuring the bottom protective plate 200 as a four-layer composite structure, utilizing the buffer layer 220, metal layer, and insulating plate 240, not only is the rigidity and strength of the bottom protective plate 200 guaranteed, but it also provides insulation, cushioning, and scratch resistance, helping to protect the internal structure of the battery pack enclosure from damage. Furthermore, in special circumstances, such as when one or more layers of the bottom protective plate 200 are damaged, the damaged plates can be replaced more effectively, thereby saving costs.

[0083] In this embodiment, multiple elastic support members 900 may also be provided on the bottom protective plate 200. These elastic support members 900 can be arranged in an array on the bottom protective plate 200, or their distribution on the bottom protective plate 200 can be flexibly adjusted according to the distribution of the battery cells. Specifically, the elastic support member 900 can be provided on the insulating plate 240 of the bottom protective plate 200, and its material can be circular foam or other materials with elastic support functions; no specific limitation is made thereto.

[0084] By setting multiple elastic support members 900 on the bottom protective plate 200, the elastic support members 900 can not only improve the support capacity of the bottom protective plate 200 for the battery module, but also play the role of energy absorption and shock absorption, further improving the safety of the battery pack.

[0085] Moreover, in practical applications, the battery cells are placed inside the battery pack housing via battery cell trays. By setting multiple elastic support members 900, the multiple elastic support members 900 can support the bottom of the battery cell tray and form a certain gap between the battery cell tray and the lower bottom protective plate 200. This gap can be connected to the pressure relief gap 320 below the aforementioned pressure relief chamber 300 to ensure that when the battery cell runs out of control, the gas can flow into the pressure relief hole 310 through the aforementioned pressure relief gap 320 and finally complete the pressure relief.

[0086] It should be noted that, in order to achieve stable pressure relief, in addition to supporting the cell tray with multiple elastic support members 900 to form a gap for gas flow, when actually setting the foaming adhesive, due to the upward foaming and limited flow characteristics of the foaming adhesive, the foaming area of ​​the foaming adhesive can be reasonably controlled, and the above-mentioned pressure relief gap 320 can be blocked in advance with the tooling to avoid the foaming adhesive blocking the pressure relief gap 320, thereby ensuring that stable pressure relief can be achieved when the cell runs out of control.

[0087] Furthermore, in this embodiment, the bottom protective plate 200 adopts a four-layer composite structure, but it is not excluded that the bottom protective plate 200 may use a combination of two, three, five, or more layers of materials. For example, when the main performance requirement for the bottom protective plate 200 is cushioning, the bottom protective plate 200 may consist only of the bottom plate 210 and the cushioning layer 220; when the main performance requirements for the bottom protective plate 200 are cushioning and insulation, the bottom protective plate 200 may consist only of the bottom plate 210, the cushioning layer 220, and the insulating plate 240; and when there are more performance requirements for the bottom protective plate 200, more materials may be added as needed based on this embodiment. Further structural variations of the bottom protective plate 200 will not be exhaustively listed here.

[0088] Example 2

[0089] This invention also provides a battery pack, which includes the battery pack housing described above. A battery module (not shown in the figure) is disposed inside the battery pack housing. The battery module can be fixed to the bottom protective plate 200 by means of expanding foam adhesive.

[0090] By installing the battery modules in the aforementioned battery pack housing, and utilizing the structural design of the battery pack housing, the overall rigidity and strength of the battery pack can be improved while ensuring pressure relief. This also enhances the battery pack's scratch resistance, reduces the risk of deformation and breakage, and thus extends the battery pack's service life.

[0091] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery pack housing, characterized in that, The device includes a housing frame, and a structural reinforcement is provided on the inner side of the housing frame. The structural reinforcement is connected to the housing frame, and the structural reinforcement is provided with a receiving cavity that communicates with the inner space of the housing frame. The receiving cavity is configured to receive at least a portion of the expanding foam. The box frame includes multiple interconnected side beams, the structural reinforcement includes multiple inner side beams, and the accommodating cavity includes a first accommodating cavity disposed on the inner side beams. The inner side beams include: A first connecting portion is configured to connect to the corresponding edge beam; and The first bend is connected to the side of the first connecting portion away from the corresponding side beam, and the first bend includes a hook portion; The first bent portion and the corresponding side beam together form the first receiving cavity. A first opening is also formed between the first bent portion and the corresponding side beam. The first opening communicates with the first receiving cavity and is configured to allow expanding foam to enter the first receiving cavity.

2. The battery pack housing according to claim 1, characterized in that, The plurality of inner side beams are respectively fixedly installed on one of the side beams.

3. The battery pack housing according to claim 2, characterized in that, The first accommodating cavity extends along the inner side beam and communicates with the inner space of the box frame.

4. The battery pack housing according to claim 1, characterized in that, The structural reinforcement also includes an inner beam disposed inside the box frame, with each end of the inner beam connected to one of the side beams.

5. The battery pack housing according to claim 4, characterized in that, The accommodating cavity further includes a second accommodating cavity disposed on the inner beam, the second accommodating cavity extending along the inner beam and communicating with the inner space of the box frame.

6. The battery pack housing according to claim 5, characterized in that, The inner beam includes: The main connecting part is connected to one of the side beams at each end; The second connecting part is fixedly disposed on the main connecting part and extends along the main connecting part; The third connecting portion is vertically fixed to the side of the second connecting portion away from the main connecting portion and extends along the main connecting portion; and Two second bends are respectively disposed on opposite sides of the third connecting portion; The two second bends and the second connecting portion each form a second accommodating cavity; a second opening is also formed between the second bend and the second connecting portion, the second opening communicates with the second accommodating cavity, and the second opening is configured to allow expanding foam to enter the second accommodating cavity.

7. The battery pack housing according to any one of claims 1-6, characterized in that, The structural reinforcement has multiple vent holes, which are connected to the accommodating cavity. The multiple vent holes and the foam inlet on the structural reinforcement are respectively located on opposite sides of the structural reinforcement.

8. The battery pack housing according to any one of claims 1-6, characterized in that, The battery pack housing also includes a bottom protective plate connected to the housing frame, the bottom protective plate comprising: Base plate; A buffer layer is provided on the side of the base plate near the box frame; A metal plate is disposed on the side of the buffer layer opposite to the base plate; and An insulating plate is disposed on the side of the metal plate opposite to the buffer layer.

9. The battery pack housing according to claim 8, characterized in that, The bottom protective plate is provided with multiple elastic support members on the side of the inner space near the box frame.

10. The battery pack housing according to any one of claims 1-6, characterized in that, The box frame is provided with pressure relief chambers on opposite sides, and the box frame is also provided with multiple pressure relief holes; each pressure relief chamber is connected to at least one of the pressure relief holes.

11. The battery pack housing according to claim 10, characterized in that, The pressure relief chamber is located on the side of the side beam near the bottom protective plate, and a pressure relief gap is formed between the side beam and the bottom protective plate. The pressure relief gap is configured to connect the inner space of the box frame.

12. The battery pack housing according to any one of claims 1-6, characterized in that, The top of the housing frame is recessed with a top groove, the width of the upper opening of the top groove is greater than the width of its bottom, and the top groove is configured to accommodate sealant.

13. The battery pack housing according to any one of claims 1-6, characterized in that, A reinforcing plate is also provided on the inner side of the box frame. The reinforcing plate is obliquely fixed to the side beam near the inner side of the box frame, and a first opening is formed between the reinforcing plate and the inner side beam on the corresponding side.

14. A battery pack, characterized in that, Includes the battery pack housing as described in any one of claims 1-13.

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