Box structure of battery pack and battery pack

Abstract

The utility model provides a box body structure of a battery pack and the battery pack. The box body structure of the battery pack comprises an outer frame, an inner frame, a cold plate, a bottom protection plate and a buffer structure, the outer frame comprises a first edge beam. The inner frame comprises a second boundary beam. The cold plate is arranged below the inner frame in the first direction. The cold plate can comprise a runner area and a non-runner area, and the non-runner area is connected with the lower surface of the inner frame. And the first edge beam is connected with the second edge beam, so that the inner frame is embedded in the outer frame. Height difference exists between the first edge beam and the second edge beam in the first direction, so that the lower surface of the outer frame protrudes out of the lower surface of the inner frame in the first direction. The bottom protection plate is arranged below the cold plate in the first direction. The bottom protection plate is connected with the lower surface of the outer frame. The buffer structure is arranged between the cold plate and the bottom protection plate in the first direction, so that the first face of the buffer structure is connected with the bottom protection plate, and the second face of the buffer structure is connected with the non-runner area. According to the invention, the probability of deformation of the cold plate is reduced, and the stability and safety of the battery are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a box structure of a battery pack and a battery pack. Background Art

[0002] The battery pack's housing is the outer shell of the battery system, protecting the battery modules from external impact and environmental factors. The housing includes a cold plate and a bottom guard plate. The cold plate maintains the battery modules at a suitable operating temperature, while the bottom guard plate protects against external impact.

[0003] In the related art, when the bottom guard plate is hit, the impact force causes the cold plate to deform, reducing the service life of the cold plate, thereby affecting the stability and safety of the battery. Utility Model Content

[0004] The present application provides a battery pack box structure and a battery pack, which extend the service life of the cold plate, thereby improving the stability and safety of the battery.

[0005] In a first aspect, the present application provides a box structure for a battery pack, comprising: an outer frame, an inner frame, a cold plate, a bottom guard plate, and a buffer structure. The outer frame includes a first side beam. The inner frame includes a second side beam. The cold plate is arranged below the inner frame along a first direction. The first direction may be the height direction of the box structure. The cold plate may include a flow channel area and a non-flow channel area, and the non-flow channel area is connected to the lower surface of the inner frame. The first side beam is connected to the second side beam so that the inner frame is nested in the outer frame. In addition, there is a height difference between the first side beam and the second side beam in the first direction, so that the lower surface of the outer frame protrudes from the lower surface of the inner frame in the first direction. The bottom guard plate is arranged below the cold plate along the first direction. In addition, the bottom guard plate is connected to the lower surface of the outer frame. The buffer structure is arranged between the cold plate and the bottom guard plate along the first direction. The buffer structure includes a first surface and a second surface arranged opposite to each other. The first surface is connected to the bottom guard plate, and the second surface is connected to the non-flow channel area.

[0006] According to the first aspect, the bottom guard plate is connected to the lower surface of the outer frame. The non-flow channel area of the cold plate is connected to the lower surface of the inner frame. A buffer structure is connected between the non-flow channel area and the bottom guard plate, allowing the inner frame to withstand the impact force exerted on the bottom guard plate, while preventing the flow channel area of the cold plate from directly bearing the impact force and causing deformation. The outer frame includes a first side beam. The first side beam is connected to the second side beam, allowing the inner frame to be nested within the outer frame. Furthermore, the height difference between the first side beam and the second side beam in the first direction causes the lower surface of the outer frame to protrude beyond the lower surface of the inner frame in the first direction. The bottom guard plate is connected to the lower surface of the outer frame, and a mounting position for the cold plate is reserved between the lower surfaces of the outer frame and the inner frame, so that the cold plate does not contact the outer frame. This allows the outer frame to withstand the impact force exerted on the bottom guard plate, while preventing the cold plate from bearing the impact force and causing deformation. The probability of deformation of the cold plate and the flow channel area of the cold plate is reduced, thereby extending the service life of the cold plate and improving the stability and safety of the battery.

[0007] In a possible design, a first sealing gasket is provided between the bottom guard plate and the outer frame.

[0008] Based on the description of the above embodiment, in the related art, the cold plate, bottom guard plate, and outer frame are stacked and connected. A first sealing gasket is provided between the bottom guard plate and the outer frame, and a second sealing gasket is provided between the cold plate and the outer frame. Two layers of sealing gaskets require a large amount of material and are costly. Therefore, in this application, only the first sealing gasket is required between the bottom guard plate and the first side beam to achieve a sealed battery pack box structure, thereby saving the production cost of the box structure.

[0009] In one possible design, the height difference between the lower surface of the outer frame and the lower surface of the inner frame is greater than or equal to 2 mm; and the height difference between the lower surface of the outer frame and the lower surface of the inner frame is less than or equal to 10 mm.

[0010] Based on the description of the above embodiment, the height difference between the lower surface of the outer frame and the lower surface of the inner frame ranges from 2 mm to 10 mm, which satisfies the cold plate installation requirements while reducing the production cost of the box structure as much as possible.

[0011] In a possible design, a plurality of densely arranged first rivet holes are opened on the non-flow channel area, so that the non-flow channel area is riveted to the inner frame through the first rivet holes.

[0012] Based on the description of the above embodiment, a plurality of densely arranged first rivet holes are provided on the non-flow channel area, so that the non-flow channel area is riveted to the inner frame through the first rivet holes, thereby improving the connection strength between the cold plate and the inner frame and preventing the cold plate from falling off, thereby ensuring that the cold plate can perform the heat dissipation function normally, thereby improving the stability and safety of the battery.

[0013] In a possible design, structural adhesive is laid between the connection surfaces of the cold plate and the inner frame.

[0014] Based on the description of the above embodiments, laying structural adhesive between the connection surfaces of the cold plate and the inner frame can further enhance the connection strength between the cold plate and the inner frame.

[0015] In one possible design, the structural adhesive may be a sealing structural adhesive.

[0016] Based on the description of the above embodiments, the use of sealing structural adhesive can further improve the sealing of the box structure, thereby ensuring the stability and safety of the battery.

[0017] In one possible design, the bottom guard plate is provided with a plurality of second rivet holes and a plurality of first fastening holes. The second rivet holes are used for riveting to the outer frame, and the first fastening holes are used for connecting to the non-flow channel area.

[0018] Based on the description of the above embodiment, a plurality of second rivet holes and a plurality of first fastening holes are provided on the bottom guard plate, which improves the connection strength between the bottom guard plate and the outer frame, prevents the bottom guard plate from falling off, ensures the sealing of the box structure, and thus ensures the stability and safety of the battery.

[0019] In a possible design, a heat-insulating buffer pad is provided between the cold plate and the bottom guard plate. The heat-insulating buffer pad can be bonded to the bottom guard plate or the cold plate.

[0020] Based on the description of the above embodiment, a thermal insulation buffer pad is provided between the cold plate and the bottom guard plate, so that the impact force generated when the bottom guard plate contacts the cold plate is dispersed by the thermal insulation buffer pad, thereby extending the service life of the cold plate and improving the stability and safety of the battery.

[0021] In one possible design, the bottom guard plate may be coated with a PVC coating.

[0022] Based on the description of the above embodiment, the bottom guard plate is coated with a PVC coating, which can improve the buffering effect of the bottom guard plate and extend the service life of the bottom guard plate, thereby ensuring the stability and safety of the battery.

[0023] In a second aspect, the present application provides a battery pack comprising: a battery module and a housing structure according to any one of the above embodiments. The battery module is disposed within the housing structure. The housing structure has a cold plate, and the battery module contacts the cold plate.

[0024] The beneficial effects of the battery pack provided in the second aspect can be referred to the beneficial effects brought about by the first aspect and the various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 A schematic diagram of a box structure of a battery pack exploded along a first direction according to an embodiment of the present application.

[0027] Figure 2 This is a schematic diagram of the assembly of an outer frame and an inner frame provided in an embodiment of the present application.

[0028] Figure 3 for Figure 1 View in the other direction.

[0029] Figure 4 This is a schematic diagram of the assembly of the cold plate and buffer structure provided in an embodiment of the present application.

[0030] Figure 5 for Figure 3 Cross-sectional view along direction A.

[0031] Figure 6 for Figure 5 Magnified view of part B.

[0032] Figure 7 for Figure 5 Magnified view of section C.

[0033] Figure 8 A schematic structural diagram of a buffer structure provided in an embodiment of the present application.

[0034] Figure 9 This is a schematic diagram of the assembly of a cold plate, a buffer structure and a thermal insulation buffer pad provided in an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 100- box structure;

[0037] 1-outer frame; 11-first side beam;

[0038] 2-inner frame; 21-second side beam; 22-structural beam;

[0039] 3-cold plate; 31-flow channel area; 32-non-flow channel area; 33-first rivet hole;

[0040] 4- bottom guard plate; 41- second rivet hole; 42- first fastening hole;

[0041] 5-buffer structure; 51-first avoidance hole; 52-second avoidance hole;

[0042] 6-first sealing pad; 7-thermal insulation cushion;

[0043] X - first direction. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0046] The terms "comprises", "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.

[0047] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0049] The directional words appearing in the following description are all directions shown in the drawings and do not limit the specific structure of this application. For example, in the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting this application.

[0050] In addition, the expressions indicating directions such as the X direction, Y direction, and Z direction used to illustrate the operation and construction of the various components of this embodiment are not absolute but relative, and although these indications are appropriate when the various components are in the positions shown in the figures, when these positions are changed, these directions should be interpreted differently to correspond to the changes.

[0051] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0052] In the description of this application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two (including two).

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, "connected" or "connected" in a mechanical structure can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection via a fixing member, such as a screw, bolt, or other fixing member. A physical connection can also be a detachable connection, such as a mutual snap-fit connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. "Connected" or "connected" in a circuit structure can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is interconnected. It can also refer to internal communication between two elements. A signal connection can refer to a signal connection through a circuit or a signal connection through a media medium, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application.

[0054] First, as Figure 1-Figure 4 As shown, the present application provides a box structure 100 for a battery pack, comprising: an outer frame 1, an inner frame 2, a cold plate 3, a bottom guard plate 4, and a buffer structure 5. The outer frame 1 includes a first side beam 11. The inner frame 2 includes a second side beam 21. The cold plate 3 is arranged below the inner frame 2 along a first direction X. The first direction X may be the height direction of the box structure 100. The cold plate 3 may include a flow channel area 31 and a non-flow channel area 32, and the non-flow channel area 32 is connected to the lower surface of the inner frame 2. The first side beam 11 is connected to the second side beam 21, so that the inner frame 2 is nested in the outer frame 1. In addition, there is a height difference between the first side beam 11 and the second side beam 21 in the first direction X, so that the lower surface of the outer frame 1 protrudes above the lower surface of the inner frame 2 in the first direction X. The bottom guard plate 4 is arranged below the cold plate 3 along the first direction X. In addition, the bottom guard plate 4 is connected to the lower surface of the outer frame 1. The buffer structure 5 is arranged between the cold plate 3 and the bottom guard plate 4 along the first direction X. The buffer structure 5 includes a first surface and a second surface that are opposite to each other. The first surface is connected to the bottom guard plate 4 , and the second surface is connected to the non-flow channel area 32 .

[0055] The outer frame 1 and the inner frame 2 can both be a frame structure.

[0056] like Figure 2 and Figure 3 As shown, the frame structure may include a plurality of side beams, and the plurality of side beams are connected end to end to form the outer contour of the frame structure. The frame structure may also include a structural beam 22 built between the side beams. The structural beam 22 can be used to disperse the load. Among them, the structural beam 22 may include a cross beam and a longitudinal beam. The cross beam is a structural beam 22 built horizontally between the side beams, and the longitudinal beam is a structural beam 22 built longitudinally between the side beams. The construction directions of the cross beam and the longitudinal beam are perpendicular to each other to facilitate the distinction between the structures in the inner frame 2 and the outer frame 1. In the following, the first side beam 11 refers to the side beam of the outer frame 1, and the second side beam 21 refers to the side beam of the inner frame 2.

[0057] Furthermore, if Figure 2 As shown, the inner frame 2 is nested in the outer frame 1 , so that the second side beam 21 is connected to the first side beam 11 .

[0058] The connection method between the second side beam 21 and the first side beam 11 may include but is not limited to the following two methods:

[0059] Method 1: Welding the second side beam 21 to the first side beam 11. When the inner frame 2 and the outer frame 1 are made of the same material, the second side beam 21 and the first side beam 11 can be connected by welding. For example, the inner frame 2 and the outer frame 1 are both made of aluminum profiles.

[0060] Method 2: Transfer welding the second side beam 21 to the first side beam 11. When the inner frame 2 and the outer frame 1 are made of different materials, the second side beam 21 and the first side beam 11 can be connected by transfer welding. For example, the inner frame 2 is a solid steel structure and the outer frame 1 is an aluminum profile.

[0061] Among them, the whole steel structure has better load-bearing effect and fatigue resistance. Aluminum profiles are cheaper. Operators can choose according to actual needs.

[0062] like Figure 1 As shown, the cold plate 3 is disposed below the inner frame 2 along a first direction X. The first direction X may be a height direction of the box structure 100 .

[0063] like Figure 4 As shown, the cold plate 3 may include a flow channel area 31 and a non-flow channel area 32 .

[0064] The flow channel area 31 allows for the flow of coolant, which helps dissipate heat from the battery module, maintaining the battery within its optimal operating temperature range and thus ensuring stability and safety. To ensure the coolant's proper function, the flow channel area 31 must be sealed. Therefore, the non-flow channel area 32 is connected to the inner frame 2.

[0065] Furthermore, if Figure 1 As shown, the bottom guard plate 4 is arranged below the cold plate 3 along the first direction X. In addition, the bottom guard plate 4 is connected to the outer frame 1. Specifically, as shown in FIG. Figure 2 As shown, when the inner frame 2 is nested within the outer frame 1, there is a height difference between the first side beam 11 and the second side beam 21 in the first direction X, causing the lower surface of the outer frame 1 to protrude beyond the lower surface of the inner frame 2 in the first direction X. This leaves room for the cold plate 3 to be installed between the outer and inner frames 1 and 2, preventing the cold plate 3 from contacting the outer frame 1. This indicates that when an impact is sustained at the location where the bottom guard plate 4 connects to the first side beam 11, the impact force can be directly transmitted to the outer frame 1, allowing the outer frame 1 to directly bear the impact force, thereby preventing deformation of the cold plate 3 caused by the impact force and ensuring the normal heat dissipation function of the cold plate 3.

[0066] Furthermore, if Figure 1 As shown, the buffer structure 5 is arranged between the cold plate 3 and the bottom guard plate 4 along the first direction X. The buffer structure 5 includes a first surface and a second surface arranged opposite to each other. The first surface is connected to the bottom guard plate 4, and the second surface is connected to the non-flow channel area 32 of the cold plate 3. When the position where the bottom guard plate 4 and the buffer structure 5 are connected is impacted, the impact force can be transmitted to the non-flow channel area 32 through the buffer structure 5, and then transmitted to the inner frame 2 through the non-flow channel area 32, so that the inner frame 2 is subjected to the above-mentioned impact force, and the flow channel area 31 is prevented from being directly subjected to the above-mentioned impact force and deformed, thereby ensuring the normal heat dissipation function of the cold plate 3.

[0067] Specifically, if Figure 4As shown, the buffer structure 5 can be one or more bottom guard plates 4.

[0068] according to Figure 1 and Figure 2 It can be seen that the connection between the bottom guard plate 4 and the outer frame 1 is located at the edge of the bottom guard plate 4, and the connection between the bottom guard plate 4 and the buffer structure 5 is located in the middle of the bottom guard plate 4. Combining the above, we can conclude that the impact force on the edge of the bottom guard plate 4 is borne by the outer frame 1, and the impact force on the middle of the bottom guard plate 4 is borne by the inner frame 2. This disperses the impact force on the cold plate 3 from multiple directions, extends the service life of the cold plate 3, and thus improves the stability and safety of the battery.

[0069] In summary, the bottom guard plate 4 is connected to the lower surface of the outer frame 1. The non-flow channel area 32 of the cold plate 3 is connected to the lower surface of the inner frame 2. The buffer structure 5 is connected between the non-flow channel area 32 and the bottom guard plate 4, so that the inner frame 2 bears the impact force of the bottom guard plate 4 and prevents the flow channel area 31 of the cold plate 3 from directly bearing the above-mentioned impact force and causing deformation. The outer frame 1 includes a first side beam 11. The first side beam 11 is connected to the second side beam 21, so that the inner frame 2 is nested in the outer frame 1. In addition, the height difference between the first side beam 11 and the second side beam 21 in the first direction X causes the lower surface of the outer frame 1 to protrude from the lower surface of the inner frame 2 in the first direction X. The bottom guard plate 4 is connected to the lower surface of the outer frame 1, and a mounting position for the cold plate 3 is reserved between the lower surface of the outer frame 1 and the lower surface of the inner frame 2, so that the cold plate 3 does not contact the outer frame 1, thereby allowing the outer frame 1 to bear the impact force of the bottom guard plate 4 and preventing the cold plate 3 from bearing the above-mentioned impact force and causing deformation. The probability of deformation of the cold plate 3 and the flow channel area 31 of the cold plate 3 is reduced, which prolongs the service life of the cold plate 3 and thus improves the stability and safety of the battery.

[0070] In some embodiments, as Figure 1 As shown, a first sealing gasket 6 is provided between the bottom guard plate 4 and the outer frame 1 .

[0071] The box structure 100 of the battery pack has a receiving cavity in which the battery module and the cold plate 3 are arranged. In order to prevent the battery module from short-circuiting or reducing safety due to external moisture and contaminants, the box structure 100 needs to be sealed.

[0072] A first sealing gasket 6 is provided between the bottom guard plate 4 and the outer frame 1, sealing the connection between the two. Furthermore, the cold plate 3 is embedded in the outer frame 1 and connected to the inner frame 2, placing the cold plate 3 within the sealed space created by the connection between the bottom guard plate 4 and the outer frame 1. Therefore, the sealing effect of the above-described box structure 100 is achieved by simply providing the first sealing gasket 6 between the bottom guard plate 4 and the outer frame 1.

[0073] In the related art, the cold plate 3, bottom guard plate 4, and outer frame 1 are stacked and connected. A first sealing gasket 6 is provided between the bottom guard plate 4 and the outer frame 1, and a second sealing gasket is provided between the cold plate 3 and the outer frame 1. Two layers of sealing gaskets require a large amount of material and are costly. Therefore, in this application, only the first sealing gasket 6 is required between the bottom guard plate 4 and the outer frame 1 to achieve a sealed battery pack box structure 100, thereby reducing the production cost of the box structure 100.

[0074] Furthermore, in some embodiments, the height difference between the lower surface of the outer frame 1 and the lower surface of the inner frame 2 is greater than or equal to 2 mm; and the height difference between the lower surface of the outer frame 1 and the lower surface of the inner frame 2 is less than or equal to 10 mm.

[0075] Specifically, at least one cold plate 3 must be placed in the space formed by the height difference between the lower surfaces of the outer frame 1 and the inner frame 2. Therefore, the height difference between the lower surfaces of the outer frame 1 and the inner frame 2 must be at least greater than or equal to the thickness of one cold plate 3. For example, if the cold plate 3 is 2 mm thick, the height difference between the lower surfaces of the outer frame 1 and the inner frame 2 must be greater than or equal to 2 mm.

[0076] In addition, considering the overall height of the battery pack and the cost of production materials, the upper limit of the height difference between the lower surface of the outer frame 1 and the lower surface of the inner frame 2 must also be controlled. For example, the height between the lower surface of the outer frame 1 and the lower surface of the inner frame 2 can be less than or equal to 10 mm.

[0077] According to the description of the above embodiment, the height difference between the lower surface of the outer frame 1 and the lower surface of the inner frame 2 ranges from 2 mm to 10 mm, which satisfies the installation requirements of the cold plate 3 while minimizing the production cost of the box structure 100 .

[0078] Specifically, in some embodiments, Figure 5 and Figure 6 As shown, a plurality of densely arranged first rivet holes 33 are opened on the non-flow channel area 32 , so that the non-flow channel area 32 is riveted to the inner frame 2 through the first rivet holes 33 .

[0079] Riveting, a traditional mechanical connection method, offers advantages such as high connection strength, no thermal stress, and reduced vibration transmission. Riveting creates a very strong connection point, thereby ensuring the connection strength between the cold plate 3 and the inner frame 2 and preventing the cold plate 3 from falling off.

[0080] Furthermore, the more riveted connection points there are, the greater the connection strength between the cold plate 3 and the inner frame 2 .

[0081] According to the description of the above embodiment, a plurality of densely arranged first rivet holes 33 are provided on the non-flow channel area 32, so that the non-flow channel area 32 is riveted to the inner frame 2 through the first rivet holes 33, thereby improving the connection strength between the cold plate 3 and the inner frame 2 and preventing the cold plate 3 from falling off, so as to ensure that the cold plate 3 can perform the heat dissipation function normally, thereby improving the stability and safety of the battery.

[0082] Furthermore, in some embodiments, structural adhesive is laid between the connection surfaces of the cold plate 3 and the inner frame 2 .

[0083] Structural adhesives are high-strength adhesives used to bond structural components subject to heavy loads. They offer high bond strength and excellent seismic resistance, enabling them to form strong connections between dissimilar surfaces such as metal, glass, concrete, and plastic.

[0084] Furthermore, the structural adhesive application process does not require altering the overall structure of the cold plate 3. For example, there is no need to drill holes in the cold plate 3. Therefore, the structural adhesive can be applied to either the flow channel area 31 or the non-flow channel area 32, thereby increasing the connection area between the cold plate 3 and the inner frame 2 and further enhancing the connection strength between the cold plate 3 and the inner frame 2.

[0085] Based on this, laying structural adhesive between the connection surfaces of the cold plate 3 and the inner frame 2 can further enhance the connection strength between the cold plate 3 and the inner frame 2 .

[0086] Furthermore, in some embodiments, a layer of structural adhesive may be pre-sealed in the first rivet hole 33 of the non-flow channel area 32 to make the riveted connection stronger, thereby further enhancing the connection strength between the cold plate 3 and the inner frame 2 .

[0087] Furthermore, in some embodiments, the structural adhesive may be a sealing structural adhesive.

[0088] In addition to high bonding strength, sealing structural adhesive also has good sealing properties.

[0089] Based on the description of the above embodiments, the use of sealing structural adhesive can further improve the sealing of the box structure 100, thereby ensuring the stability and safety of the battery.

[0090] Specifically, in some embodiments, Figure 6 and Figure 7 As shown, the bottom guard plate 4 is provided with a plurality of second rivet holes 41 and a plurality of first fastening holes 42. The second rivet holes 41 are used for riveting to the outer frame 1. The first fastening holes 42 are used for connecting to the non-flow channel area 32.

[0091] The bottom guard plate 4 is riveted to the outer frame 1 through a plurality of second rivet holes 41, thereby ensuring the connection strength between the bottom guard plate 4 and the outer frame 1 and preventing the bottom guard plate 4 from falling off. The advantages of riveting have been mentioned above and will not be repeated here.

[0092] Since the connection position between the bottom guard plate 4 and the outer frame 1 is located at the edge of the bottom guard plate 4, a plurality of first fastening holes 42 are further provided on the bottom guard plate 4 to improve the connection strength between the bottom guard plate 4 and the box structure 100. Figure 1 As shown, a plurality of first fastening holes 42 are provided at the position where the bottom guard plate 4 is connected to the buffer structure 5 .

[0093] According to the description of the above embodiment, a plurality of second rivet holes 41 and a plurality of first fastening holes 42 are provided on the bottom guard plate 4, which improves the connection strength between the bottom guard plate 4 and the outer frame 1, prevents the bottom guard plate 4 from falling off, ensures the sealing of the box structure 100, and thus ensures the stability and safety of the battery.

[0094] Furthermore, when the first fastening hole 42 is provided at the position where the bottom guard plate 4 is connected to the buffer structure 5, in some embodiments, such as Figure 8 As shown, the bottom guard plate 4 is provided with a first avoidance hole 51 and a second avoidance hole 52. The first avoidance hole 51 is used to avoid the rivet in the first rivet hole 33. The second avoidance hole 52 is used to avoid the fastening bolt in the first fastening hole 42.

[0095] In some embodiments, as Figure 1 As shown, a heat-insulating buffer pad 7 is provided between the cold plate 3 and the bottom guard plate 4. The heat-insulating buffer pad 7 can be bonded to the bottom guard plate 4 or the cold plate 3.

[0096] The bottom guard plate 4 will deform when impacted by external force, and the deformation direction is toward the cold plate 3 . When the deformation degree is large, there is a possibility of direct contact between the bottom guard plate 4 and the cold plate 3 .

[0097] Based on this, a thermal insulation buffer pad 7 is provided between the cold plate 3 and the bottom guard plate 4, so that the impact force generated when the bottom guard plate 4 contacts the cold plate 3 is dispersed by the thermal insulation buffer pad 7, thereby extending the service life of the cold plate 3 and improving the stability and safety of the battery.

[0098] Furthermore, the thermal insulation buffer pad 7 also has a thermal insulation function, which keeps the battery within the optimal operating temperature range, thereby ensuring the stability and safety of the battery.

[0099] Furthermore, if Figure 9 As shown, the thermal insulation cushion 7 can be arranged away from the buffer structure 5. For example, the box structure 100 includes two rows of buffer structures 5, and the thermal insulation cushion 7 can be arranged between the two rows of buffer structures 5 and around the two rows of buffer structures 5 to avoid affecting the effect of the buffer structure 5 in transmitting the impact force.

[0100] In some embodiments, the bottom guard plate 4 may be coated with a PVC coating.

[0101] The PVC coating can be used to resist stone impact and improve the cushioning effect of the bottom guard plate 4.

[0102] According to the description of the above embodiment, the bottom guard plate 4 is coated with a PVC coating, which can improve the buffering effect of the bottom guard plate 4 and extend the service life of the bottom guard plate 4, thereby ensuring the stability and safety of the battery.

[0103] In a second aspect, embodiments of the present application provide a battery pack comprising: a battery module and a box structure 100 according to any one of the above embodiments. The battery module is disposed within the box structure 100. The box structure 100 has a cold plate 3, and the battery module is in contact with the cold plate 3.

[0104] like Figure 1 As shown, the battery module includes multiple battery cells, and the inner frame 2 of the box structure 100 has multiple structural beams 22. The structural beams 22 divide the box structure 100 into multiple installation spaces, and one battery cell is placed in each installation space, so that each battery cell can contact the cold plate 3.

[0105] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0106] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A box structure of a battery pack, characterized in that: include: Outer frame, inner frame, cold plate, bottom guard plate and buffer structure; The outer frame includes a first side beam; The inner frame includes a second side beam; The cold plate is arranged below the inner frame along a first direction; Wherein, the first direction is the height direction of the box structure; The cold plate includes a flow channel area and a non-flow channel area, and the non-flow channel area is connected to the lower surface of the inner frame; The first side beam is connected to the second side beam so that the inner frame is nested in the outer frame; Furthermore, there is a height difference between the first side beam and the second side beam in the first direction, so that the lower surface of the outer frame protrudes from the lower surface of the inner frame in the first direction; The bottom guard plate is arranged below the cold plate along the first direction; Furthermore, the bottom guard plate is connected to the lower surface of the outer frame; The buffer structure is arranged between the cold plate and the bottom guard plate along the first direction; The buffer structure includes a first surface and a second surface arranged opposite to each other; The first surface is connected to the bottom guard plate, and the second surface is connected to the non-flow channel area.

2. The box structure according to claim 1, characterized in that: A first sealing gasket is provided between the bottom guard plate and the outer frame.

3. The box structure according to claim 1, characterized in that: The height difference between the lower surface of the outer frame and the lower surface of the inner frame is greater than or equal to 2 mm; Furthermore, a height difference between a lower surface of the outer frame and a lower surface of the inner frame is less than or equal to 10 mm.

4. The box structure according to claim 1, characterized in that: The non-flow channel area is provided with a plurality of densely arranged first rivet holes, so that the non-flow channel area is riveted to the inner frame through the first rivet holes.

5. The box structure according to any one of claims 1 to 4, characterized in that: Structural adhesive is laid between the connection surfaces of the cold plate and the inner frame.

6. The box structure according to claim 5, characterized in that: The structural adhesive may be a sealing structural adhesive.

7. The box structure according to any one of claim 1, characterized in that: The bottom guard plate is provided with a plurality of second rivet holes and a plurality of first fastening holes; The second rivet hole is used for riveting to the outer frame; The first fastening hole is used to connect with the non-flow channel area.

8. The box structure according to claim 1, characterized in that: A thermal insulation cushion is provided between the cold plate and the bottom guard plate; The thermal insulation buffer pad can be bonded to the bottom guard plate or the cold plate.

9. The box structure according to claim 1, characterized in that: The bottom guard plate may be coated with a PVC coating.

10. A battery pack, characterized in that: A battery module and a box structure according to any one of claims 1 to 9; The battery module is arranged in the box structure; The box structure has a cold plate, and the battery module is in contact with the cold plate.

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