Lower shell bottom protection plate assembly, lower shell and battery pack

Abstract

The utility model belongs to the technical field of power batteries, and relates to a lower shell bottom protection plate assembly, a lower shell and a battery pack. The lower shell bottom protection plate assembly comprises a liquid cooling plate; the bottom protection plate is arranged opposite to the liquid cooling plate in the first direction, and a mounting gap area is formed between the bottom protection plate and the liquid cooling plate; the buffer reinforcing piece is arranged in the mounting gap area and provided with an upper supporting part and a lower supporting part which are connected and oppositely arranged in the first direction, the upper supporting part faces and supports the liquid cooling plate, and the lower supporting part is connected with the bottom protection plate; at least one elastic opening structure is arranged between the upper supporting part and the lower supporting part so as to be suitable for elastic deformation when the bottom protection plate is pressed in the first direction. The buffer reinforcer is arranged in the mounting gap area, the space utilization rate is high, and the rigidity of the whole structure is improved; the buffer reinforcer has an elastic opening structure, can elastically deform to buffer the impact force on the bottom guard plate, reduces the damage to the liquid cooling plate, reduces the influence on the cooling effect, improves the protection capability of the bottom guard plate, and facilitates the improvement of the product quality and safety performance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power battery technical field, especially relate to a lower shell bottom guard plate subassembly, lower shell and battery pack. BACKGROUND

[0002] Battery pack generally has electric core, liquid cooling board, bottom guard plate and upper cover and so on, and liquid cooling board and bottom guard plate as important parts of battery pack, play the role of heat protection and mechanical protection. At present, the cooperation mode of liquid cooling board and bottom guard plate mainly has two kinds, one is to adopt extrusion type liquid cooling board, because the rigidity of extrusion type liquid cooling board is big, the structural consistency is high, and the extrusion type liquid cooling board can be used as bottom guard plate simultaneously, but in order to meet the rigidity requirement, it usually needs greater height space, and the excessive cooling flow channel in liquid cooling board can produce air bubble, backflow, reduce cooling efficiency, and because of lacking additional bottom guard plate protection, the bottom of battery pack is subjected to extrusion, ball hit, and cooling flow channel can be deformed, even rupture, in addition, the extrusion process has certain requirement to material, and the cost is higher. Another is to adopt stamping type bottom guard plate and brazing liquid cooling board cooperation, although the manufacturing, assembly process is simple, and the material selection is relatively free, and the space utilization rate is high, but the rigidity of the assembled structure is low, and when facing the ball hit of greater energy, the bottom guard plate cannot effectively protect liquid cooling board and electric core. Visible, the cooperation mode of liquid cooling board and bottom guard plate commonly used at present all has the problem of low structural rigidity. SUMMARY

[0003] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide a lower shell bottom guard plate subassembly, a lower shell and a battery pack, which solve the problem of low structural rigidity of the liquid cooling board and the bottom guard plate in the prior art, and balance the requirements of overheating protection and mechanical protection, thereby improving the safety and product quality of the lower shell bottom guard plate subassembly, the lower shell and the battery pack.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a lower shell bottom guard plate subassembly, which comprises:

[0005] A liquid cooling board;

[0006] A bottom guard plate, which is arranged opposite to the liquid cooling board along a first direction, and has an installation gap area between the bottom guard plate and the liquid cooling board;

[0007] A buffer reinforcing member, which is arranged in the installation gap area, has an upper support part and a lower support part connected and arranged opposite along the first direction, the upper support part faces and supports the liquid cooling board, the lower support part is connected with the bottom guard plate, and at least one elastic opening structure is arranged between the upper support part and the lower support part to adapt to the elastic deformation of the bottom guard plate when it is pressed in the first direction.

[0008] Optionally, the buffer reinforcement further comprises a connecting portion, the upper support portion and the lower support portion are connected through the connecting portion, and the connecting portion defines at least one hollow cavity.

[0009] Optionally, the connecting end of the upper support portion and the connecting end of the lower support portion are connected through the connecting portion to define one of the hollow cavities, the movable end of the upper support portion is bent towards the lower support portion to form a first bending portion, the movable end of the lower support portion is bent towards the upper support portion to form a second bending portion, and the first bending portion and the second bending portion are arranged opposite to each other along the first direction to form the elastic opening structure.

[0010] Optionally, one end of the connecting portion is connected to the connecting end of the upper support portion, the other end of the connecting portion is connected to the connecting end of the lower support portion through single bending or reciprocating bending along the first direction, and the connecting portion cooperates with the upper support portion and the lower support portion to define at least two of the hollow cavities, the movable end of the upper support portion is bent towards the connecting portion to form a third bending portion, the third bending portion and part of the connecting portion are arranged opposite to each other along the first direction to form one of the elastic opening structures, the movable end of the lower support portion is bent towards the connecting portion to form a fourth bending portion, and the fourth bending portion and part of the connecting portion are arranged opposite to each other along the first direction to form the other elastic opening structure.

[0011] Optionally, the connecting end of the upper support portion and the connecting end of the lower support portion are connected through the connecting portion, the movable end of the upper support portion is reciprocatingly bent along the first direction to form a fifth bending portion towards the lower support portion, the movable end of the lower support portion is bent towards the upper support portion to form a sixth bending portion, and part of the fifth bending portion and the sixth bending portion are arranged opposite to each other along the first direction to form the elastic opening structure.

[0012] Optionally, the connecting end of the upper support portion and the connecting end of the lower support portion are located on the same side or opposite sides of the buffer reinforcement.

[0013] Optionally, the buffer reinforcement comprises a metal sheet roll or a metal sheet bending piece.

[0014] Optionally, the thickness of the bottom guard plate is d1, the thickness of the metal sheet in the buffer reinforcement is d2, 0.5d1≤d2≤0.75d1, and the overall thickness of the buffer reinforcement is D, 5mm≤D≤10mm.

[0015] Optionally, the liquid cooling plate has flow channel regions and non-flow channel regions alternately distributed along the width direction of the liquid cooling plate, and at least part of the upper support portion is in direct contact with the non-flow channel regions or indirectly contacts the non-flow channel regions through foam.

[0016] Optionally, the plurality of buffer stiffeners are distributed along the width direction of the liquid cooling plate, the upper support part of part of the buffer stiffeners is only in contact with one non-flow channel area, and the upper support part of part of the buffer stiffeners is in contact with a plurality of adjacent non-flow channel areas.

[0017] Optionally, the upper support part of the same buffer stiffener is in contact with one non-flow channel area, and the upper support part is in a flat plate structure; or the upper support part of the same buffer stiffener is in contact with a plurality of adjacent non-flow channel areas, part of the upper support part is in a flat plate structure and is in contact with the non-flow channel area, and another part of the upper support part is recessed towards the bottom guard plate and is in contact with the corresponding flow channel area.

[0018] Optionally, the upper support part is adapted to be in contact with the non-flow channel area when the liquid cooling plate is connected and fixed with the bottom guard plate.

[0019] Optionally, the lower support part is adhesively fixed or welded fixed with the bottom guard plate.

[0020] To achieve the above object and other related objects, the application further provides a lower shell, comprising the lower shell bottom guard plate assembly as described above.

[0021] To achieve the above object and other related objects, the application further provides a battery pack, comprising the lower shell as described above.

[0022] As described above, the lower shell bottom guard plate assembly, the lower shell and the battery pack of the application have at least the following beneficial effects: the buffer stiffener is arranged between the liquid cooling plate and the bottom guard plate, the installation gap area can be utilized, the space utilization rate is high, no additional installation space is occupied, the rigidity of the overall structure is improved, and the protection capability of the bottom guard plate is improved; based on this, the buffer stiffener has an elastic opening structure, can elastically deform and buffer the impact force received by the bottom guard plate, reduces the damage to the liquid cooling plate, reduces the influence on the cooling effect, further improves the protection capability of the bottom guard plate, and is beneficial to improving the product quality and safety performance. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a partial structure schematic view of the lower shell bottom guard plate assembly of the first embodiment of the application;

[0024] Figure 2 It is a partial structure schematic view of the lower shell bottom guard plate assembly of the first embodiment of the application; Figure 1 It is a sectional view of the lower shell bottom guard plate assembly;

[0025] Figure 3 It is a sectional view of the lower shell bottom guard plate assembly; Figure 2 It is an enlarged schematic view of the partial A;

[0026] Figure 4 It is an enlarged schematic view of the partial A;Figure 1 Structure diagram of the buffer reinforcing piece;

[0027] Figure 5 Part structure diagram of the lower shell bottom guard plate assembly of the second embodiment of the utility model;

[0028] Figure 6 For Figure 5 Sectional view of the lower shell bottom guard plate assembly;

[0029] Figure 7 For Figure 6 Enlarged diagram of the part B;

[0030] Figure 8 For Figure 5 Structure diagram of the buffer reinforcing piece;

[0031] Figure 9 Part structure diagram of the lower shell bottom guard plate assembly of the third embodiment of the utility model;

[0032] Figure 10 For Figure 9 Sectional view of the lower shell bottom guard plate assembly;

[0033] Figure 11 For Figure 10 Enlarged diagram of the part C;

[0034] Figure 12 For Figure 9 Structure diagram of the buffer reinforcing piece;

[0035] Figure 13 Part structure diagram of the lower shell bottom guard plate assembly of the fourth embodiment of the utility model;

[0036] Figure 14 For Figure 13 Sectional view of the lower shell bottom guard plate assembly;

[0037] Figure 15 For Figure 13 Structure diagram of the buffer reinforcing piece;

[0038] Figure 16 Simulation diagram of the ball hitting the bottom guard plate when the lower shell bottom guard plate assembly of the utility model is not provided with the buffer reinforcing piece;

[0039] Figure 17 Simulation diagram of the ball hitting the bottom guard plate when the lower shell bottom guard plate assembly of the utility model is provided with the buffer reinforcing piece;

[0040] Figure 18 Equivalent plastic strain diagram of the buffer reinforcing piece of the lower shell bottom guard plate assembly of the utility model when the material and thickness of the buffer reinforcing piece are different.

[0041] PART NUMBER EXPLANATION

[0042] Liquid cooling plate 1, upper plate body 11, lower plate body 12, non-flow channel area 13, flow channel area 14, bottom guard plate 2, installation gap area 3, second assembly gap 31, first assembly gap 32, buffer reinforcement 4, upper support part 41, first bending part 411, third bending part 412, fifth bending part 413, lower support part 42, second bending part 421, fourth bending part 422, sixth bending part 423, connecting part 43, elastic opening structure 44, hollow cavity 45, locking hole 5. DETAILED DESCRIPTION

[0043] The following describes the embodiments of the present application by specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present specification.

[0044] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to understand and read the content disclosed in the present specification by those skilled in the art, and are not used to limit the implementation conditions of the present application, and therefore do not have technical substantive significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" used in the present specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0045] Referring to Figures 1 to 5 , Figure 9 , Figure 11 and Figure 13In some optional embodiments, the application provides a lower shell bottom guard plate assembly, which comprises a liquid cooling plate 1, a bottom guard plate 2 and a buffer reinforcing member 4. The bottom guard plate 2 is arranged opposite to the liquid cooling plate 1 along a first direction, and the bottom guard plate 2 and the liquid cooling plate 1 have a mounting gap area 3 therebetween. The buffer reinforcing member 4 is arranged in the mounting gap area 3, or in other words, the buffer reinforcing member 4 is arranged between the bottom guard plate 2 and the liquid cooling plate 1. The buffer reinforcing member 4 has an upper support part 41 and a lower support part 42 connected and arranged opposite along the first direction, the upper support part 41 faces and supports the liquid cooling plate 1, and the lower support part 42 is connected with the bottom guard plate 2, specifically, the lower support part 42 can be fixedly connected with the bottom guard plate 2 by bonding, welding or other connection manners; the upper support part 41 and the lower support part 42 have at least one elastic opening structure 44 therebetween to adapt to elastic deformation of the bottom guard plate 2 when the bottom guard plate 2 is pressed in the first direction. In the application, the first direction, the thickness direction of the bottom guard plate 2 and the overall thickness direction of the buffer reinforcing member 4 are the same, that is, the Z direction in the drawings.

[0046] Optionally, the buffer reinforcing member 4 further comprises a connecting part 43, the upper support part 41 and the lower support part 42 are connected through the connecting part 43, and the upper support part 41 and the lower support part 42 both have a connecting end and a movable end distributed along the width direction of the liquid cooling plate 1, the connecting end of the upper support part 41 is connected with the connecting end of the lower support part 42 through the connecting part 43, and the upper support part 41, the lower support part 42 and the connecting part 43 are connected to jointly define at least one hollow cavity 45. This structure design can not only ensure that the buffer reinforcing member 4 has a certain strength, but also can elastically deform to provide a space for elastic deformation of the buffer reinforcing member 4, so that the buffer reinforcing member 4 has good buffer deformation capacity, can effectively absorb impact energy and disperse stress, and improves the buffer effect. Among them, the connecting end of the upper support part 41 and the connecting end of the lower support part 42 are located on the same side or opposite sides of the buffer reinforcing member 4; when the connecting end of the upper support part 41 and the connecting end of the lower support part 42 are located on the same side of the buffer reinforcing member 4, the movable end of the upper support part 41 and the movable end of the lower support part 42 are also located on the same side of the buffer reinforcing member 4; when the connecting end of the upper support part 41 and the connecting end of the lower support part 42 are located on opposite sides of the buffer reinforcing member 4, the movable end of the upper support part 41 and the movable end of the lower support part 42 are also located on opposite sides of the buffer reinforcing member 4. Further, the hollow cavity 45 is open at both ends in the length direction of the buffer reinforcing member 4, that is, the hollow cavity 45 is not closed at both ends in the length direction of the buffer reinforcing member 4.

[0047] Optionally, the elastic opening structure 44 extends through both ends of the buffer reinforcing member 4 along the length direction of the buffer reinforcing member 4. Among them, the elastic opening structure 44 can be arranged on the side wall of the hollow cavity 45, so that the side wall of the hollow cavity 45 is disconnected, for example, the cross section of the hollow cavity 45 is in a U-shaped structure. In the application, the extension direction of the elastic opening structure 44, the length direction of the buffer reinforcing member 4 and the length direction of the liquid cooling plate 1 are the same, that is, the Y direction in the drawings.

[0048] Optionally, the liquid cooling plate 1 has flow channel areas 14 and non-flow channel areas 13 alternately distributed along the width direction of the liquid cooling plate 1, and at least part of the upper support part 41 is in direct contact with the non-flow channel areas 13 or indirectly contacts the non-flow channel areas 13 through the foam. The structure design makes the upper support part 41 abut against the non-flow channel areas 13 when the bottom guard plate 2 is hit by a ball or extruded, so that the load can be transmitted to the non-flow channel areas 13, which is beneficial to reduce the extrusion on the flow channel areas 14 and thus reduce the interference with the cooling effect of the liquid cooling plate 1. Among them, the liquid cooling plate 1 includes an upper plate body 11 and a lower plate body 12 distributed along the first direction, the upper plate body 11 is attached to the lower plate body 12, and part of the lower plate body 12 is arched towards the bottom guard plate 2 to define a medium passage with part of the upper plate body 11 for conveying cooling medium, the medium passage corresponds to the flow channel area 14, and the flow channel area 14 will be damaged when it is pressed. Further, when the upper support part 41 indirectly contacts the non-flow channel areas 13 through the foam, the upper support part 41 and the non-flow channel areas 13 have a first assembly gap 32, and the foam can be filled in the first assembly gap 32. The upper support part 41 contacts the non-flow channel areas 13 through the foam with buffering deformation performance, which not only facilitates the assembly tolerance requirement, is simple and convenient to assemble, but also is beneficial to reduce the damage to the liquid cooling plate 1. In this application, the width direction of the liquid cooling plate 1, the distribution direction of the plurality of flow channel areas 14 and the distribution direction of the plurality of non-flow channel areas 13 are the same, that is, the X direction in the drawing.

[0049] Optionally, the liquid cooling plate 1 and / or the bottom guard plate 2 is provided with a locking hole 5, and the liquid cooling plate 1 and the bottom guard plate 2 are connected and fixed by a locking member. The locking member can be a bolt, which passes through the locking hole 5 to connect and fix the liquid cooling plate 1 and the bottom guard plate 2, and the connection is firm and reliable. Among them, the upper support part 41 is adapted to contact or abut against the non-flow channel areas 13 when the liquid cooling plate 1 and the bottom guard plate 2 are connected and fixed by the locking member; specifically, during assembly, the buffer reinforcing part 4 is first fixed on the bottom guard plate 2, and then the bottom guard plate 2 is locked with the liquid cooling plate 1 by the locking member. When locked in place, the upper support part 41 contacts or abuts against the non-flow channel areas 13. The assembly is simple, convenient and efficient.

[0050] The above-mentioned embodiment of the lower shell bottom guard plate assembly, the buffer reinforcing part 4 is arranged in the installation gap area 3, which can effectively utilize the idle space between the liquid cooling plate 1 and the bottom guard plate 2, without occupying additional installation space, which is beneficial to improve the space utilization; the buffer reinforcing part 4 is beneficial to improve the rigidity of the overall structure of the lower shell bottom guard plate assembly, and the elastic opening structure 44 of the buffer reinforcing part 4 can be elastically deformed to buffer the impact received by the bottom guard plate 2, which is beneficial to reduce the damage to the liquid cooling plate 1, protect the liquid cooling plate 1, and improve the safety and quality of the lower shell bottom guard plate assembly.

[0051] Referring to Figures 5 to 8In some optional embodiments, the connecting end of the upper support part 41 and the connecting end of the lower support part 42 are connected through the connecting part 43 to define a hollow cavity 45, the active end of the upper support part 41 is bent towards the lower support part 42 to form a first bending part 411, and the active end of the lower support part 42 is bent towards the upper support part 41 to form a second bending part 421, the first bending part 411 and the second bending part 421 are arranged opposite and spaced apart along the first direction to form the elastic opening structure 44. The connecting end of the upper support part 41 and the connecting end of the lower support part 42 are located on the same side of the buffer reinforcement 4, and the active end of the upper support part 41 and the active end of the lower support part 42 are located on the same side of the buffer reinforcement 4. When the bottom guard plate 2 is impacted or extruded, the upper support part 41 abuts against the non-flow channel area 13, the opening degree of the elastic opening structure 44 is reduced, the buffering effect is good, the structure is simple, and the difficulty of forming and manufacturing is low.

[0052] Referring to Figures 1 to 4 In some optional embodiments, one end of the connecting part 43 is connected with the connecting end of the upper support part 41, and the other end of the connecting part 43 is connected with the connecting end of the lower support part 42 through single bending or reciprocating bending along the first direction, and the connecting part 43, the upper support part 41 and the lower support part 42 cooperatively define at least two hollow cavities 45, the active end of the upper support part 41 is bent towards the connecting part 43 to form a third bending part 412, the third bending part 412 and the local part of the connecting part 43 are arranged opposite and spaced apart along the first direction to form one of the elastic opening structures 44, the active end of the lower support part 42 is bent towards the connecting part 43 to form a fourth bending part 422, and the fourth bending part 422 and the local part of the connecting part 43 are arranged opposite and spaced apart along the first direction to form the other elastic opening structure 44. The connecting part 43, the upper support part 41 and the lower support part 42 cooperatively define two hollow cavities 45, the connecting end of the upper support part 41 and the connecting end of the lower support part 42 are located on opposite sides of the buffer reinforcement 4, and the active end of the upper support part 41 and the active end of the lower support part 42 are located on opposite sides of the buffer reinforcement 4, the structure is symmetrical, the stress deformation is uniform, and the stability is good.

[0053] Referring to Figures 9 to 12 In some optional embodiments, the connecting end of the upper support part 41 and the connecting end of the lower support part 42 are connected through the connecting part 43, the active end of the upper support part 41 is reciprocatingly bent along the first direction to form a fifth bending part 413 towards the lower support part 42, the active end of the lower support part 42 is bent towards the upper support part 41 to form a sixth bending part 423, and the local part of the fifth bending part 413 and the sixth bending part 423 are arranged opposite and spaced apart along the first direction to form the elastic opening structure 44. The connecting end of the upper support part 41 and the connecting end of the lower support part 42 are located on the same side of the buffer reinforcement 4, and the active end of the upper support part 41 and the active end of the lower support part 42 are located on the same side of the buffer reinforcement 4.

[0054] Referring to Figure 1 、 Figure 5 、 Figure 9 、 Figure 13 、 Figures 16 to 18 In some optional embodiments, the buffer reinforcement 4 comprises a metal sheet roll piece or a metal sheet bending piece. The metal sheet roll piece is formed by rolling a metal sheet, and the metal sheet bending piece is formed by bending a metal sheet.

[0055] Optionally, the metal sheet comprises a steel sheet or an aluminum sheet.

[0056] Optionally, the thickness of the bottom guard plate 2 is d1, and the thickness of the metal sheet of the buffer reinforcement 4 is d2, and 0.5d1≤d2≤0.75d1. Further, d2 can be any of 0.6d1, 0.65d1, 0.7d1, or 0.74d1.

[0057] Optionally, the overall thickness of the buffer reinforcement 4 is D, and 5mm≤D≤10mm. Further, D can be any of 6mm, 8mm, or 9mm. The height of the buffer reinforcement 4 does not exceed 10mm, which facilitates the use of the gap between the non-flow channel area 13 of the liquid cooling plate 1 and the bottom guard plate 2, and is conducive to making the overall thickness of the liquid cooling plate 1, the buffer reinforcement 4, and the bottom guard plate 2 not exceeding 13mm, and occupying less space.

[0058] Referring to Table 1, the performance of the buffer reinforcement 4 is related to the material and thickness of the metal sheet. The following takes the metal sheet of the buffer reinforcement 4 as a steel sheet and an aluminum sheet as an example.

[0059] Table 1

[0060] Evaluation criteria E d (mm) N F K M (mm) Example 1 Steel 0 12.3 7.08％ 59.10％ 4.9 Example 2 Steel 0.5 7.1 5.65％ 36.21％ 3.7 Example 3 Steel 1 4.6 6.36％ 35.10％ 2.4 Example 4 Aluminium 0.5 7.6 5.43％ 43.26％ 4.1 Example 5 Aluminium 1 5.0 5.87％ 48.23％ 2.7

[0061] In Table 1, E is the material of the metal sheet; d is the thickness of the metal sheet; N is the maximum deformation of the liquid cooling plate 1 when the bearing capacity of the bottom guard plate 2 ball (ball diameter 150mm) reaches 15KN; F is the maximum equivalent plastic strain of the liquid cooling plate 1 when the bearing capacity of the bottom guard plate 2 ball (ball diameter 150mm) reaches 15KN; K is the maximum plastic deformation of the liquid cooling plate 1 when the bottom of the bottom guard plate 2 is hit by a dynamic ball (ball diameter 25mm) with a kinetic energy of 120J; and M is the maximum intrusion amount of the liquid cooling plate 1 during the dynamic ball hitting process.

[0062] As can be seen from Table 1, increasing the thickness of the metal sheet can effectively reduce the ball impact intrusion amount, thereby reducing the damage to the liquid cooling plate 1 and further reducing the damage to the battery cell. The material of the metal sheet mainly affects the energy absorption effect, and a suitable material can be selected according to the requirements. For example, the metal sheet is made of steel plate, which is convenient for bonding or welding with the bottom guard plate 2, the connection mode is diversified, and the protection effect is good; the metal sheet is made of aluminum plate, the aluminum plate is fixed with the bottom guard plate 2 through the bonding mode, but the mass of the aluminum plate is lighter than that of the steel plate, and the aluminum plate can be used in the case of high weight requirement.

[0063] The bottom guard plate assembly of the lower shell of the above-mentioned embodiment, the metal sheet has a high elongation at break, which is convenient for roll forming or bending forming, and the forming manufacturing is simple and low in cost.

[0064] Referring to Figure 3 , Figure 7 , Figure 11 , Figures 13 to 15 In some optional embodiments, the number of the buffer stiffeners 4 is multiple, the multiple buffer stiffeners 4 are distributed along the width direction of the liquid cooling plate 1, the upper support part 41 of part of the buffer stiffeners 4 is only in contact or abutment with one non-flow channel area 13, and the upper support part 41 of part of the buffer stiffeners 4 is in contact or abutment with multiple adjacent non-flow channel areas 13.

[0065] Optionally, the upper support part 41 of the same buffer stiffener 4 is in contact or abutment with one non-flow channel area 13, and the upper support part 41 has a flat plate structure.

[0066] Optionally, the upper support part 41 of the same buffer stiffener 4 is in contact or abutment with multiple adjacent non-flow channel areas 13, part of the upper support part 41 has a flat plate structure and is in contact or abutment with the non-flow channel area 13, and another part of the upper support part 41 is recessed towards the bottom guard plate 2 and is in contact with the corresponding flow channel area 14. The part of the upper support part 41 corresponding to the flow channel area 14 has a second assembly gap 31 therebetween, the second assembly gap 31 can be filled with foam, and the height d3 of the second assembly gap 31 is greater than the height d4 of the first assembly gap 32. When the upper support part 41 is in contact or abutment with the non-flow channel area 13, the extrusion force mainly acts on the non-flow channel area 13, which is conducive to reducing the damage to the flow channel area 14. Further, the upper support part 41 of the same buffer stiffener 4 is in contact or abutment with two adjacent non-flow channel areas 13. That is, the upper support part 41 is in direct contact or indirect contact through the filling of foam with the non-flow channel area 13; the upper support part 41 is in direct contact or indirect contact through the filling of foam with the flow channel area 14.

[0067] The bottom guard plate assembly of the lower shell of the above-mentioned embodiment, multiple buffer stiffeners 4 are arranged between the liquid cooling plate 1 and the bottom guard plate 2, which is conducive to further improving the rigidity of the overall structure of the bottom guard plate assembly of the lower shell.

[0068] Referring toFigures 1 to 15 In some optional embodiments, the application further provides a lower shell comprising the lower shell bottom guard plate assembly as in any of the above embodiments.

[0069] Referring to Figures 1 to 15 In some optional embodiments, the application further provides a battery pack comprising the lower shell as described above.

[0070] The lower shell bottom guard plate assembly, the lower shell and the battery pack have the following advantages: the buffer reinforcing piece 4 is arranged in the mounting gap area 3 between the liquid cooling plate 1 and the bottom guard plate 2, which is beneficial to improve the space utilization rate, and the buffer reinforcing piece 4 can provide bearing capacity; in the case of the same extrusion force, the arrangement of the buffer reinforcing piece 4 is beneficial to reduce the deformation of the bottom guard plate 2 and the liquid cooling plate 1, the protection performance is better, and the product quality and the safety performance of the lower shell bottom guard plate assembly, the lower shell and the battery pack are improved.

[0071] In the description of the present application, the description of the terms "the present embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A lower housing bottom protective plate assembly, characterized in that, include: Liquid cooling plate; A bottom protective plate, wherein the bottom protective plate and the liquid cooling plate are arranged opposite to each other along a first direction, and there is an installation gap area between the bottom protective plate and the liquid cooling plate; A buffer reinforcement is disposed within the installation gap area. The buffer reinforcement has an upper support portion and a lower support portion connected and arranged opposite to each other along the first direction. The upper support portion faces and supports the liquid cooling plate, and the lower support portion is connected to the bottom protective plate. At least one elastic opening structure is provided between the upper support portion and the lower support portion to accommodate the elastic deformation of the bottom protective plate when it is compressed in the first direction.

2. The lower housing bottom protective plate assembly according to claim 1, characterized in that, The buffer reinforcement also includes a connecting portion, through which the upper support portion and the lower support portion are connected and together define at least one hollow cavity.

3. The lower housing bottom protective plate assembly according to claim 2, characterized in that, The connecting end of the upper support and the connecting end of the lower support are connected by the connecting part to define a hollow cavity. The movable end of the upper support is bent toward the lower support to form a first bent part, and the movable end of the lower support is bent toward the upper support to form a second bent part. The first bent part and the second bent part are arranged opposite to each other along the first direction and spaced apart to form the elastic opening structure.

4. The lower housing bottom protective plate assembly according to claim 2, characterized in that, One end of the connecting part is connected to the connecting end of the upper support part, and the other end of the connecting part is bent once or repeatedly along the first direction and connected to the connecting end of the lower support part, and cooperates with the upper support part and the lower support part to define at least two hollow cavities. The movable end of the upper support part is bent toward the connecting part to form a third bend. The third bend and a portion of the connecting part are aligned and spaced apart along the first direction to form one of the elastic opening structures. The movable end of the lower support part is bent toward the connecting part to form a fourth bend. The fourth bend and a portion of the connecting part are aligned and spaced apart along the first direction to form another elastic opening structure.

5. The lower housing bottom protective plate assembly according to claim 2, characterized in that, The connecting end of the upper support and the connecting end of the lower support are connected by the connecting part. The movable end of the upper support is bent back and forth along the first direction to form a fifth bent part facing the lower support. The movable end of the lower support is bent towards the upper support to form a sixth bent part. A portion of the fifth bent part and the sixth bent part are directly opposite each other along the first direction and spaced apart to form the elastic opening structure.

6. The lower housing bottom guard plate assembly according to any one of claims 3 to 5, characterized in that, The connecting end of the upper support and the connecting end of the lower support are located on the same side or opposite sides of the buffer reinforcement.

7. The lower housing bottom guard plate assembly according to any one of claims 1 to 5, characterized in that, The buffer reinforcement includes a metal sheet roll forming component or a metal sheet bending component.

8. The lower housing bottom protective plate assembly according to claim 7, characterized in that, The thickness of the bottom protective plate is d1, and the thickness of the metal sheet in the buffer reinforcement is d2, where 0.5d1≤d2≤0.75d1; the overall thickness of the buffer reinforcement is D, where 5mm≤D≤10mm.

9. The lower housing bottom protective plate assembly according to claim 1, characterized in that, The liquid cooling plate has flow channel areas and non-flow channel areas that are alternately distributed along the width direction of the liquid cooling plate, and at least a portion of the upper support is in direct contact with the non-flow channel area or indirect contact with the non-flow channel area through foam.

10. The lower housing bottom protective plate assembly according to claim 9, characterized in that, The plurality of buffer reinforcements are spaced apart along the width direction of the liquid cooling plate. The upper support portion of some of the buffer reinforcements contacts only one of the non-flow channel areas, while the upper support portion of some of the buffer reinforcements contacts multiple adjacent non-flow channel areas.

11. The lower housing bottom protective plate assembly according to claim 9, characterized in that, The upper support portion of the same buffer reinforcement contacts one of the non-flow channel areas, and the upper support portion has a flat plate structure; or, the upper support portion of the same buffer reinforcement contacts multiple adjacent non-flow channel areas, a portion of the upper support portion has a flat plate structure and contacts the non-flow channel areas, and another portion of the upper support portion is recessed toward the bottom guard plate and contacts the corresponding flow channel area.

12. The lower housing bottom protective plate assembly according to claim 9, characterized in that, The upper support portion is adapted to contact the non-flow channel area when the liquid cooling plate is connected and fixed to the bottom protective plate.

13. The lower housing bottom protective plate assembly according to claim 1, characterized in that, The lower support is bonded or welded to the bottom protective plate.

14. A lower housing, characterized in that, Includes the lower housing bottom guard plate assembly as described in any one of claims 1 to 13.

15. A battery pack, characterized in that, Includes the lower housing as described in claim 14.

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