Buffer assembly, battery pack of battery assembly and vehicle

Abstract

The utility model discloses a buffer assembly, a battery pack of a battery assembly and a vehicle, the buffer assembly comprises a first buffer pad with at least three buffer sections and folding sections, and one folding section is connected between every two adjacent buffer sections; the first buffer pad has a to-be-assembled state and an assembled state, in the to-be-assembled state, all the buffer sections extend in the first direction, all the folding sections are provided with folding notches with openings facing the second direction, and the area of the folding notches on the projection plane in the thickness direction of the first buffer pad is a first area; in the assembling state, the extending directions of every two adjacent buffering sections intersect, the area of the folding notch on the projection plane is a second area in the thickness direction of the first buffering pad, and the second area is smaller than the first area. According to the buffer assembly disclosed by the utility model, the overall structure of the buffer assembly is simple, the production cost is low, the sealing effect is good, glue is effectively prevented from flowing into an area which is not allowed to be invaded, and the reliability of the single cell is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery engineering technical field especially relates to a buffer assembly, battery assembly battery pack and vehicle. BACKGROUND

[0002] The design scheme of the existing battery pack, the battery cell needs to be connected with the box bottom plate or the water cooling plate through the glue. In the process of the battery cell entering the box and being pressed, the glue between the battery cell and the water cooling plate will overflow to the top of the battery cell along the gap between the battery cells under the action of pressure. However, the battery cell is the most important unit in the power battery system, and it is required to be uniformly stressed in the cyclic expansion process, and no hard structural member or substance is allowed to exist in the non-intrusion area, so as to avoid the expansion process being blocked and the local stress deformation of the battery cell being pressed to winding, causing lithium precipitation and other adverse effects, and further affecting the battery life.

[0003] In the related art, the overflowed glue is blocked from entering the non-intrusion area by using the buffer pad between the battery cells. The buffer pad usually has two structure forms of a patching type back-shaped frame and an integrated back-shaped frame. The integrated back-shaped frame structure needs to be opened, and the forming process is complex, and the production cost is high. The patching type back-shaped frame is combined by two horizontal and two vertical glue strips. Affected by the incoming material size and process capacity fluctuation, there must be an assembly gap at the joint of the two glue strips. When the glue height exceeds the glue assembly position, the overflowed glue will enter the large surface of the battery cell through the glue assembly gap. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving one of the technical problems in the prior art. Therefore, one purpose of the utility model is to provide a buffer assembly, which can make the overall structure of the buffer assembly simple, low in production cost, good in sealing effect, effectively avoid the glue flowing into the non-intrusion area, and improve the reliability of the single battery cell.

[0005] The utility model further provides a battery assembly with the buffer assembly.

[0006] The utility model further provides a battery pack with the battery assembly.

[0007] The utility model further provides a vehicle with the battery pack.

[0008] The buffer assembly according to the utility model, through setting up the first buffer pad with multiple buffer sections and folding sections which are connected alternately, and setting up the folding gap which opens to the second direction at the folding section, the first buffer pad can turn over at the folding gap, so that the extension directions of the two adjacent buffer sections intersect, the projection of the multiple buffer sections on the projection plane along the thickness direction of the first buffer pad can enclose a ring structure or a groove structure with an opening, and the folding section is prevented from being wrinkled when the two adjacent buffer sections turn over each other, the sealing effect is good, the overall structure is simple, the production cost is low, when the buffer assembly is used for buffering the two adjacent single cells, the first buffer pad can reliably contact with the large faces of the two adjacent single cells, the first buffer pad can better buffer and protect the two adjacent single cells, the first buffer section in the assembled state can effectively seal the expansion reserved space, the glue is effectively prevented from flowing into the non-permitted invasion area, and the reliability of the single cell is improved.

[0009] The buffer assembly according to the utility model, through setting up the first buffer pad with multiple buffer sections and folding sections which are connected alternately, and setting up the folding gap which opens to the second direction at the folding section, the first buffer pad can turn over at the folding gap, so that the extension directions of the two adjacent buffer sections intersect, the projection of the multiple buffer sections on the projection plane along the thickness direction of the first buffer pad can enclose a ring structure or a groove structure with an opening, and the folding section is prevented from being wrinkled when the two adjacent buffer sections turn over each other, the sealing effect is good, the overall structure is simple, the production cost is low, when the buffer assembly is used for buffering the two adjacent single cells, the first buffer pad can reliably contact with the large faces of the two adjacent single cells, the first buffer pad can better buffer and protect the two adjacent single cells, the first buffer section in the assembled state can effectively seal the expansion reserved space, the glue is effectively prevented from flowing into the non-permitted invasion area, and the reliability of the single cell is improved.

[0010] According to some embodiments of the utility model, in the assembled state, the folding gap is closed.

[0011] According to some embodiments of the utility model, in the assembled state, the folding gap is closed.

[0012] According to some embodiments of the present application, in the state to be assembled, the edge of the first joint surface at the opening of the folding gap is a first edge, the edge of the second joint surface at the opening of the folding gap is a second edge, the size of the first edge and the second edge in the first direction is a gap width, the intersection line of the first joint surface and the second joint surface is a folding line, the size of the adjacent two folding lines in the first direction is a shielding length, and the ratio of the gap width to the shielding length is greater than or equal to 0.2 and less than or equal to 0.4.

[0013] In some embodiments of the present application, in the state to be assembled, the angle between the first joint surface and the second joint surface is greater than or equal to 80° and less than or equal to 160°.

[0014] In some embodiments of the present application, in the state to be assembled, a wrinkle-preventing groove is further arranged on the folding section, and the wrinkle-preventing groove is located at the intersection of the first joint surface and the second joint surface and is in communication with the folding gap.

[0015] In some embodiments of the present application, in the state to be assembled, in the second direction, the surface of the first cushion pad away from the opening of the folding gap is a liquid-blocking surface, the minimum size from the surface of the wrinkle-preventing groove to the liquid-blocking surface is a breakage-preventing height, and the breakage-preventing height is not less than 1 mm.

[0016] In some embodiments of the present application, in the state to be assembled, in the second direction, the surface of the first cushion pad away from the opening of the folding gap is a liquid-blocking surface, the minimum size from the surface of the wrinkle-preventing groove to the liquid-blocking surface is a breakage-preventing height, and the ratio of the breakage-preventing height to the thickness of the first cushion pad is greater than or equal to 1 and less than or equal to 3.

[0017] In some specific embodiments of the present application, in the state to be assembled, the projection of the wrinkle-preventing groove on the projection surface along the thickness direction of the first cushion pad is a hole.

[0018] According to some specific embodiments of the present application, in the state to be assembled, in the second direction, the surface of the first cushion pad away from the opening of the folding gap is a liquid-blocking surface, the minimum size from the surface of the wrinkle-preventing groove to the liquid-blocking surface is a breakage-preventing height, and the ratio of the diameter of the wrinkle-preventing groove to the thickness of the first cushion pad is greater than or equal to 2 and less than or equal to 4.

[0019] According to some specific embodiments of the present application, the size of the first cushion pad in the second direction is a pad width, and the sum of the diameter of the wrinkle-preventing groove and the thickness of the first cushion pad is not greater than half of the pad width.

[0020] According to some embodiments of the present application, in the state to be assembled, the surfaces of the folding gap on both sides of the first direction are respectively third and fourth joint surfaces, the third joint surface has a protruding part protruding towards the fourth joint surface, and the fourth joint surface has a recessed part recessed away from the third joint surface; in the assembled state, the protruding part is embedded in the recessed part, and the third joint surface is in contact with the fourth joint surface.

[0021] According to some embodiments of the present application, the buffer section is four, in the state to be assembled, two buffer sections at both ends in the first direction are respectively first and second stops, the end surface of the first stop away from the second stop is a first end surface, and the end surface of the second stop away from the first stop is a second end surface, in the assembled state, the first end surface is in contact with the second end surface.

[0022] According to some embodiments of the present application, the buffer section is three, in the assembled state, the first buffer pad defines an expansion reserved space with an opening; the buffer assembly further comprises: a second buffer pad, in the assembled state, the second buffer pad covers the opening of the expansion reserved space.

[0023] According to the battery assembly of the second aspect of the present application, it comprises: the buffer assembly of the first aspect of the present application; a plurality of single cells, a plurality of the single cells are arranged in sequence along a third direction, and one buffer assembly is arranged between adjacent two single cells; wherein the third direction is parallel to the thickness direction of the buffer assembly.

[0024] According to the battery assembly of the present application, by arranging the above buffer assembly, the overall structure is simple, the production cost is low, the adjacent two single cells can be better buffered and protected, the first buffer section in the assembled state can effectively form a better seal on the expansion reserved space, a better sealing effect is formed on the non-permissible intrusion area of the single cell, the glue flowing into the non-permissible intrusion area is effectively avoided, and the reliability of the single cell is ensured.

[0025] According to the battery pack of the third aspect of the present application, it comprises: the battery assembly of the second aspect of the present application.

[0026] According to the battery pack of the present application, by arranging the above battery assembly, the production cost is low, and the reliability is high.

[0027] According to the vehicle of the fourth aspect of the present application, it comprises: the battery pack of the third aspect of the present application.

[0028] According to the vehicle of the utility model, through set above battery pack, low in production cost, high reliability.

[0029] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0030] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0031] Figure 1 It is the schematic diagram of battery assembly according to some embodiments of the utility model, wherein the first buffer pad is in the assembled state;

[0032] Figure 2 It is Figure 1 The front view of the first buffer pad in the first buffer pad in the first buffer pad is in the state of being assembled;

[0033] Figure 3 It is Figure 2 The enlarged view of partial structure of the first buffer pad in the first buffer pad;

[0034] Figure 4 It is Figure 3 The enlarged view of partial structure of the first buffer pad in the first buffer pad;

[0035] Figure 5 It is Figure 2 The side view of the first buffer pad in the first buffer pad;

[0036] Figure 6 It is the schematic diagram of battery assembly according to some other embodiments of the utility model, wherein the first buffer pad is in the assembled state;

[0037] Figure 7 It is Figure 6 The front view of the first buffer pad in the first buffer pad, wherein the first buffer pad is in the state of being assembled;

[0038] Figure 8 It is the schematic diagram of battery assembly according to some other embodiments of the utility model, wherein the first buffer pad is in the assembled state;

[0039] Figure 9 It is Figure 8 The front view of the first buffer pad in the first buffer pad, wherein the first buffer pad is in the state of being assembled;

[0040] Figure 10 It is the schematic diagram of battery assembly according to some other embodiments of the utility model, wherein the first buffer pad is in the assembled state.

[0041] REFERENCE NUMERALS:

[0042] 100. A battery assembly;

[0043] 10. A cushion assembly;

[0044] 1. A first cushion; 11. A cushion segment; 12. A folding segment; 13. A folding notch; 131. A first joint surface; 132. A second joint surface; 14. An expansion reserved space; 15. A liquid blocking surface; 16. An anti-wrinkle groove; 17. A first blocking strip; 171. A first end surface; 18. A second blocking strip; 181. A second end surface;

[0045] 2. A second cushion;

[0046] 3. An adhesive layer;

[0047] 40. A single battery cell; 4. A pole. DETAILED DESCRIPTION

[0048] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0049] The cushion assembly 10 according to the embodiments of the present application will be described below with reference to the drawings.

[0050] The cushion assembly 10 of the embodiments of the present application can be applied between two adjacent pre-protective members to produce a cushioning effect on the two pre-protective members. For example, the pre-protective member can be a single battery cell 40, and the cushion assembly 10 is arranged between the large faces of the two single battery cells 40 to isolate the two single battery cells 40 and provide an expansion space for the two single battery cells 40. The pre-protective member can also be a printed circuit board, and the cushion assembly 10 is arranged between the two printed circuit boards to isolate the two printed circuit boards and prevent the two printed circuit boards from being damaged by mutual friction during transportation.

[0051] Below, the cushion assembly 10 according to the embodiments of the present application will be described in detail with reference to the embodiment in which the cushion assembly 10 is arranged between the large faces of the two single battery cells 40:

[0052] Referring to Figures 1-10According to the buffer assembly 10 of the first aspect of the present application, the first buffer pad 1 has a buffer section 11 and a folding section 12, the buffer section 11 is at least three, and one folding section 12 is connected between two adjacent buffer sections 11; it should be understood that the buffer assembly 10 should have a certain deformation ability and anti-deformation ability, that is, the first buffer pad 1 should be made of elastic material; for example, the first buffer pad 1 can be a rubber pad, and the first buffer pad 1 can also be a silica gel pad.

[0053] For example, the face connected with the buffer assembly 10 is the pre-protection face, the number of the buffer sections 11 can be the same as and one-to-one corresponding to the number of the edges of the pre-protection face, and when the number of the edges of the pre-protection face is greater than or equal to four, the number of the buffer sections 11 is less than the number of the edges of the pre-protection face of the pre-protection piece by one. Specifically, when the pre-protection piece is a single battery cell 40, the pre-protection face is the large face of the single battery cell 40, and the pre-protection face has four edges, at this time, the buffer section 11 can be four, and the buffer section 11 can also be three. For example, when the first buffer pad 1 is arranged between two single battery cells 40, the buffer section 11 can be three, and the buffer pad can also be four.

[0054] The first buffer pad 1 has an assembled state and an assembled state, in the assembled state, referring to Figure 2 , Figure 7 and Figure 9 , all the buffer sections 11 extend along the first direction (referring to the e1 direction in the drawing), all the folding sections 12 have a folding gap 13 opening towards the second direction (referring to the e2 direction in the drawing), and the area of the folding gap 13 in the projection plane along the thickness direction (referring to the e3 direction in the drawing) of the first buffer pad 1 is a first area. That is, the first buffer pad 1 is generally in a strip shape in the assembled state. Since the first buffer pad 1 is deformable, in the assembled state, the first buffer pad 1 can be curled and stored to reduce the occupied space of the first buffer pad 1, facilitating the transportation and storage of the first buffer pad 1.

[0055] In the assembled state, referring to Figure 1 , Figure 6 , Figure 8 and Figure 10 , the extension directions of the two adjacent buffer sections 11 intersect, the area of the folding gap 13 in the projection plane along the thickness direction of the first buffer pad 1 is a second area, and the second area is less than the first area; that is, the conversion of the first buffer pad 1 from the assembled state to the assembled state is realized by folding one of the two adjacent buffer sections 11 relative to the other. In this way, the size of the folding section 12 in the second direction is smaller at the folding gap 13, and when the first buffer pad 1 is bent, the first buffer pad 1 is easy to fold at the folding gap 13, facilitating the bending of the first buffer pad 1.

[0056] The first direction is perpendicular to the thickness direction of the first cushion pad 1, the second direction is perpendicular to the thickness direction of the first cushion pad 1, the first direction intersects the second direction, and the projection surface is perpendicular to the thickness direction of the first cushion pad 1.

[0057] For example, in the assembled state, referring to Figure 1 and Figure 6 , the projection of the first cushion pad 1 on the projection surface along the thickness direction of the first cushion pad 1 can be a ring shape with the first and last ends connected, and the first cushion pad 1 surrounds the closed expansion reserved space 14; in this way, the first cushion pad 1 can better isolate the two adjacent protective surfaces at more positions, the two adjacent protective surfaces are uniformly spaced, and the two adjacent protective members can be buffered by the first cushion pad 1 at more positions, thereby improving the buffering effect of the first cushion pad 1.

[0058] For example, in the assembled state, referring to Figure 8 and Figure 10 , the projection of the first cushion pad 1 on the projection surface along the thickness direction of the first cushion pad 1 can also be a groove structure with an opening, and the first cushion pad 1 surrounds the expansion reserved space 14 with an opening; in this way, the total length of the first cushion pad 1 can be set shorter, thereby reducing the production cost of the first cushion pad 1 and the overall cost of the buffering assembly 10.

[0059] When the buffering assembly 10 is clamped between the large faces of the two single cells 40, if the projection of the first cushion pad 1 on the projection surface along the thickness direction of the first cushion pad 1 is a ring shape, the gap between the first and last ends of the first cushion pad 1 can be arranged close to the pole 4 of the single cell 40; if the projection of the first cushion pad 1 on the projection surface along the thickness direction of the first cushion pad 1 is a groove structure with an opening, the opening of the expansion reserved space 14 can be arranged to face the pole 4 of the single cell 40. When the bottom surface of the single cell 40 is connected to the bottom plate of the battery pack by glue, the gap between the first and last ends of the first cushion pad 1 is farther from the bottom plate, and the opening of the expansion reserved space 14 is farther from the bottom plate, thereby effectively preventing the glue from flowing into the expansion reserved space 14, effectively avoiding the glue hardening in the expansion reserved space 14 to hinder the expansion process of the single cell 40, effectively avoiding the local stress deformation of the single cell 40 to cause lithium precipitation and other adverse effects, and further enabling the single cell 40 to reliably expand, ensuring the normal operation of the single cell 40, and improving the safety of the battery pack.

[0060] Compared with the buffering structure in the form of an integrated H-shaped frame structure, the present scheme can remove material from a strip-shaped buffering material to form the first cushion pad 1, and then form an H-shaped frame structure through folding, thereby effectively reducing the mold opening cost and the production cost of the first cushion pad 1.

[0061] Compared with the buffer structure form of the patch type back-shaped frame structure form, the first buffer pad 1 can be arranged with a gap at the head and tail close to the pole 4 of the single battery cell 40, and the opening of the expansion reserved space 14 is arranged towards the base of the single battery cell 40, so that the first buffer pad 1 can avoid forming a patch gap at the position close to the bottom plate of the battery pack (wherein the “bottom plate of the battery pack” can be the “box bottom plate of the battery pack” or the “water-cooled plate of the battery pack” mentioned in the background technology) in the assembled state, and when the glue flows from the bottom plate of the battery pack towards the pole 4, the glue can be effectively prevented from flowing into the expansion reserved space 14, and the glue can be effectively prevented from flowing into the non-permitted intrusion area s, thereby improving the reliability of the single battery cell 40.

[0062] By arranging the folding gap 13, when the two adjacent buffer segments 11 are folded relative to each other, the first buffer pad 1 can avoid being wrinkled at the folding segment 12, so that the first buffer pad 1 is relatively flat in the assembled state, and the first buffer pad 1 can be in reliable contact with the large faces of the two adjacent single battery cells 40, thereby preventing the glue from flowing into the expansion reserved space 14 between the first buffer pad 1 and the single battery cell 40, effectively preventing the glue from flowing into the non-permitted intrusion area s, and improving the reliability of the single battery cell 40. At the same time, the first buffer pad 1 is in reliable contact with the large faces of the two adjacent single battery cells 40, and the large faces of the two adjacent single battery cells 40 are uniformly spaced, so that the first buffer pad 1 can better protect the two adjacent single battery cells 40, thereby improving the reliability of the battery assembly 100.

[0063] For example, referring to Figure 5 The buffer assembly 10 can further include a bonding layer 3 connected to the two sides of the first buffer pad 1 in the thickness direction, so as to connect the first buffer pad 1 and the large face of the single battery cell 40, thereby preventing the first buffer pad from being displaced relative to the single battery cell 40 and sliding into the non-permitted intrusion area s, and preventing the single battery cell 40 from being damaged, thereby improving the reliability of the buffer assembly 10.

[0064] According to the buffering assembly 10, the first buffering section 11 can be turned over at the folding gap 13, so that the extension directions of the two adjacent buffering sections 11 intersect, the projection of the plurality of buffering sections 11 on the projection plane in the thickness direction of the first buffering pad 1 can surround an annular structure or a groove structure with an opening, and the folding gap 13 is prevented from being folded when the two adjacent buffering sections 11 are turned over, so that the sealing effect is good, the overall structure is simple, the production cost is low, and the reliability of the single battery cell 40 is improved.

[0065] Referring to Figure 1 , Figure 6 , Figure 8 and Figure 10 , according to some embodiments of the utility model, in the assembled state, the folding gap 13 is closed, that is, the area of the folding gap 13 on the projection plane in the thickness direction of the first buffering pad 1 is 0, that is, in the assembled state, the first buffering pad 1 closes the communication between the folding gap 13 and the expansion reserved space 14. When the glue flows from the folding section 12 to the expansion reserved space 14, the glue can be effectively prevented from flowing into the expansion reserved space 14 through the folding gap 13, and the sealing performance of the first buffering pad 1 is improved.

[0066] Referring to Figures 1-10 , according to some embodiments of the utility model, in the to-be-assembled state, referring to Figures 2-4 , Figure 7 and Figure 9 , the surfaces of the folding gap 13 on both sides of the first direction are respectively a first joint surface 131 and a second joint surface 132, the first joint surface 131 and the second joint surface 132 are both planes, the first joint surface 131 intersects with the second joint surface 132, that is, the folding gap 13 is generally triangular, that is, in the opening direction of the folding gap 13, the size of the folding gap 13 in the first direction gradually increases; in the assembled state, referring to Figure 1 , Figure 6 , Figure 8 and Figure 10 , the first joint surface 131 contacts with the second joint surface 132, that is, the folding gap 13 is closed.

[0067] By setting the first joint surface 131 and the second joint surface 132 as planes, the plane structure is simple, the overall structure of the folding gap 13 is relatively simple, which can reduce the difficulty of the processing technology of the folding gap 13, reduce the production cost of the folding gap 13, and reduce the production cost of the first buffer pad 1.

[0068] With reference to Figure 3 and Figure 4 According to some embodiments of the present application, in the assembled state, the edge of the first joint surface 131 at the opening of the folding gap 13 is a first edge, the edge of the second joint surface 132 at the opening of the folding gap 13 is a second edge, the size of the first edge and the second edge in the first direction is the gap width L1, that is, the maximum distance between the first joint surface 131 and the second joint surface 132 in the first direction is the gap width L1, the intersection line of the first joint surface 131 and the second joint surface 132 is the folding line, and the size of the adjacent two folding lines in the first direction is the shielding length L2.

[0069] The ratio of the gap width L1 to the shielding length L2 is greater than or equal to 0.2 and less than or equal to 0.4. For example, the ratio of the gap width L1 to the shielding length L2 can be 0.4, 0.39, 0.38, 0.37, 0.36, 0.35, 0.34, 0.33, 0.32, 0.31, 0.3, 0.29, 0.28, 0.27, 0.26, 0.25, 0.24, 0.22, 0.21, 0.2.

[0070] The larger the ratio of the gap width L1 to the shielding length L2, the larger the gap width L1, and in the assembled state of the first buffer pad 1, the probability of the folding section 12 being wrinkled due to the mutual extrusion of the first joint surface 131 and the second joint surface 132 can be effectively reduced. The smaller the ratio of the gap width L1 to the shielding length L2, the smaller the gap width L1, in the assembled state, the smaller the area of the folding gap 13 in the thickness direction of the first buffer pad 1 on the projection plane, the larger the projection area of the first buffer pad 1 in the thickness direction of the first buffer pad 1 on the projection plane, and the larger the connection area of the first buffer pad 1 and the large face of the single cell 40 in the assembled state, which can effectively fix the connection between the first buffer pad 1 and the large face of the single cell 40.

[0071] By setting the ratio of the gap width L1 to the shielding length L2 to be greater than or equal to 0.2 and less than or equal to 0.4, the area of the first buffer pad 1 in the thickness direction of the first buffer pad 1 on the projection plane can be relatively large, the connection between the first buffer pad 1 and the large face of the single cell 40 can be reliable, and the probability of the folding section 12 being wrinkled due to the mutual extrusion of the first joint surface 131 and the second joint surface 132 can be effectively reduced, so that the sealing effect of the first buffer pad 1 in the assembled state is improved, and the reliability of the battery assembly 100 is improved.

[0072] With reference to Figure 3 And Figure 4 In some embodiments of the utility model, in the state to be assembled, the angle β between the first joint surface 131 and the second joint surface 132 is greater than or equal to 80 ° and less than or equal to 160 °. For example, in the state to be assembled, the angle β between the first joint surface 131 and the second joint surface 132 can be 80 °, 85 °, 90 °, 95 °, 100 °, 105 °, 110 °, 115 °, 120 °, 125 °, 130 °, 135 °, 140 °, 145 °, 150 °, 155 °, 160 °.

[0073] The greater the angle β between the first joint surface 131 and the second joint surface 132, the greater the relative rotatable angle of the first joint surface 131 and the second joint surface 132, the greater the relative foldable angle of the two adjacent buffer sections 11, the wider the applicable range of the shape of the first buffer to the protective surface, and the higher the applicability of the first buffer. Moreover, the greater the angle β between the first joint surface 131 and the second joint surface 132, the greater the gap width L1, and when the first buffer pad 1 is in the assembled state, the probability of the first joint surface 131 and the second joint surface 132 being extruded to cause the folding section 12 to wrinkle can be effectively reduced.

[0074] The smaller the angle β between the first joint surface 131 and the second joint surface 132, the smaller the gap width L1, the smaller the area of the folding gap 13 in the projection plane along the thickness direction of the first buffer pad 1 in the state to be assembled, and the greater the projection area of the first buffer pad 1 in the projection plane along the thickness direction of the first buffer pad 1. In the assembled state, the greater the connecting area of the first buffer pad 1 and the large surface of the single cell 40, the more effectively the first buffer pad 1 and the large surface of the single cell 40 can be connected and fixed.

[0075] By setting the angle β between the first joint surface 131 and the second joint surface 132 to be greater than or equal to 80 ° and less than or equal to 160 °, the first buffer can have high applicability, the first buffer pad 1 and the large surface of the single cell 40 can be reliably connected, and the probability of the first joint surface 131 and the second joint surface 132 being extruded to cause the folding section 12 to wrinkle can be effectively reduced, so that the sealing effect of the first buffer pad 1 in the assembled state is improved, and the reliability of the battery assembly 100 is improved.

[0076] With reference to Figures 1-10In some embodiments of the utility model, in the state of waiting for assembling, anti -wrinkle groove 16 is still set up on folding section 12, anti -wrinkle groove 16 is located at the intersection of first joint surface 131 and second joint surface 132, and anti -wrinkle groove 16 is communicated with folding gap 13. When one of the two connected buffer sections 11 is turned towards the other, the turning axis of relative turning is located at the intersection of first joint surface 131 and second joint surface 132, by setting anti -wrinkle groove 16 at the position, it can prevent the bulging wrinkle at the intersection of first joint surface 131 and second joint surface 132 by the mutual extrusion of first joint surface 131 and second joint surface 132, so that the first buffer pad 1 in the assembled state is relatively flat, and the reliability of the first buffer pad 1 is improved.

[0077] Refer to Figure 4 In some embodiments of the utility model, in the state of waiting for assembling, in the second direction, the surface of first buffer pad 1 away from the opening of folding gap 13 is liquid blocking surface 15, the minimum size of the surface of anti -wrinkle groove 16 to liquid blocking surface 15 is anti -break height L3, that is, the distance from the intersection of first joint surface 131 and second joint surface 132 to liquid blocking surface 15;When the intersection of first joint surface 131 and second joint surface 132 is provided with anti -wrinkle groove 16, anti -break height L3 refers to the distance between the point farthest from folding gap 13 of anti -wrinkle groove 16 and liquid blocking surface 15, and anti -break height L3 is not less than 1mm. In this way, the folding section 12 can be effectively prevented from breaking due to too small anti -break height L3, the reliability of the folding section 12 is ensured, and the first buffer pad 1 in the assembled state is sealed reliably to the expansion reserved space 14.

[0078] Refer to Figure 4 And Figure 5 In some embodiments of the utility model, in the state of waiting for assembling, in the second direction, the surface of first buffer pad 1 away from the opening of folding gap 13 is liquid blocking surface 15, the minimum size of the surface of anti -wrinkle groove 16 to liquid blocking surface 15 is anti -break height L3, and the ratio of anti -break height L3 to the thickness L4 of first buffer pad 1 is greater than or equal to 1 and less than or equal to 3.

[0079] For example, the ratio of the anti-breaking height L3 to the thickness L4 of the first buffer pad 1 can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3. The greater the ratio of the anti-breaking height L3 to the thickness L4 of the first buffer pad 1, the greater the anti-breaking height L3, the more reliable the structure of the first buffer pad 1 at the anti-wrinkle groove 16, and the more effectively the first buffer pad 1 can avoid breaking at the anti-wrinkle groove 16, and the more reliable the structure of the first buffer pad 1. The smaller the ratio of the anti-breaking height L3 to the thickness L4 of the first buffer pad 1, the smaller the anti-breaking height L3, and the smaller the probability of the folding section 12 being wrinkled at the anti-wrinkle groove 16, and the more effectively the flatness of the first buffer pad 1 in the assembled state can be ensured.

[0080] By setting the ratio of the anti-breaking height L3 to the thickness L4 of the first buffer pad 1 to be greater than or equal to 1 and less than or equal to 3, the probability of the folding section 12 being wrinkled at the anti-wrinkle groove 16 can be reduced while ensuring the structural strength of the first buffer pad 1 at the anti-wrinkle groove 16, so that the first buffer pad 1 has a reliable structure, and the first buffer pad 1 has good flatness in the assembled state.

[0081] For example, when the thickness L4 of the first buffer pad 1 is not greater than 1mm, the anti-breaking height L3 is 1mm. This can effectively prevent the anti-breaking height L3 from being too small and causing the folding section 12 to break, ensuring the reliability of the folding section 12, and making the first buffer pad 1 in the assembled state reliably sealed against the expansion reserve space 14.

[0082] Referring to Figure 4 In some specific embodiments of the present application, in the to-be-assembled state, the projection of the anti-wrinkle groove 16 on the projection plane in the thickness direction of the first buffer pad 1 is in the shape of a hole. When the first buffer pad 1 is folded at the anti-wrinkle groove 16, the anti-wrinkle groove 16 can reserve avoidance space in all directions, reliably and effectively accommodate the structure of the folding section 12 being extruded when folded, avoid the folding section 12 from forming a protruding wrinkle at the anti-wrinkle groove 16, and make the first buffer pad 1 have good flatness in the assembled state.

[0083] Alternatively, in some specific embodiments of the present application, in the to-be-assembled state, the projection of the anti-wrinkle groove 16 on the projection plane in the thickness direction of the first buffer pad 1 can also be in the shape of an ellipse. Specifically, the major axis of the anti-wrinkle groove 16 can be parallel to the first direction. This can also make the anti-wrinkle groove 16 reserve avoidance space in all directions, reliably and effectively accommodate the structure of the folding section 12 being extruded when folded, avoid the folding section 12 from forming a protruding wrinkle at the anti-wrinkle groove 16, and make the first buffer pad 1 have good flatness in the assembled state.

[0084] REFERENCE Figure 4 AND Figure 5 According to some specific embodiments of the utility model, in the state of being assembled, in the second direction, the surface of the first buffer pad 1 away from the opening of the folding gap 13 is a liquid blocking surface 15, the minimum size of the surface of the anti-wrinkle groove 16 to the liquid blocking surface 15 is an anti-breaking height L3, and the ratio of the diameter D1 of the anti-wrinkle groove 16 to the thickness L4 of the first buffer pad 1 is greater than or equal to 2 and less than or equal to 4. For example, the ratio of the diameter D1 of the anti-wrinkle groove 16 to the thickness L4 of the first buffer pad 1 can be 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, or 4.

[0085] The greater the ratio of the diameter D1 of the anti-wrinkle groove 16 to the thickness L4 of the first buffer pad 1, the greater the diameter D1 of the anti-wrinkle groove 16, and the more space the anti-wrinkle groove 16 can reserve in each direction, thereby more effectively reducing the probability of the folding section 12 forming a raised wrinkle at the anti-wrinkle groove 16. The smaller the ratio of the diameter D1 of the anti-wrinkle groove 16 to the thickness L4 of the first buffer pad 1, the greater the area of the folding section 12 in the projection plane along the thickness direction of the first buffer pad 1, and the higher the structural strength of the folding section 12, thereby more effectively preventing the folding section 12 from breaking.

[0086] By setting the ratio of the diameter D1 of the anti-wrinkle groove 16 to the thickness L4 of the first buffer pad 1 to be greater than or equal to 2 and less than or equal to 4, the structural strength of the folding section 12 can be ensured, the folding section 12 can be prevented from breaking, the probability of the folding section 12 forming a raised wrinkle at the anti-wrinkle groove 16 can be reduced, and the first buffer pad 1 can have good flatness in the assembled state.

[0087] REFERENCE Figure 4 AND Figure 5 According to some specific embodiments of the utility model, the size of the first buffer pad 1 in the second direction is a pad width L5, and the sum of the diameter D1 of the anti-wrinkle groove 16 and the thickness L4 of the first buffer pad 1 is not greater than half of the pad width L5. In this way, the anti-wrinkle groove 16 can avoid occupying too much area, the area of the folding section 12 in the projection plane along the thickness direction of the first buffer pad 1 can be small, the folding section 12 can have a large folding area, the area of the first buffer pad 1 in the projection plane along the thickness direction of the first buffer pad 1 can be large, the first buffer pad 1 can reliably connect the large surface of the single cell 40, and the reliability of the battery assembly 100 can be improved.

[0088] ​According to some embodiments of the utility model, in the state of waiting for assembling, the surfaces of the folding gap 13 on both sides of the first direction are respectively third joint surfaces and fourth joint surfaces, the third joint surface has a protruding part protruding towards the fourth joint surface, and the fourth joint surface has a recessed part recessed away from the third joint surface; in the assembled state, the protruding part is embedded in the recessed part, and the third joint surface is in contact with the fourth joint surface. In the assembled state, the third joint surface and the fourth joint surface can form a labyrinth waterproof structure, thereby effectively preventing glue from flowing into the expansion reserved space 14 through the folding gap 13 and improving the sealing performance of the first buffer pad 1.

[0089] With reference to Figure 1 , Figure 2 According to some embodiments of the utility model, the buffer sections 11 are four, in the state of waiting for assembling, the two buffer sections 11 at both ends in the first direction are respectively a first barrier 17 and a second barrier 18, the end surface of the first barrier 17 away from the second barrier 18 is a first end surface 171, the end surface of the second barrier 18 away from the first barrier 17 is a second end surface 181, and in the assembled state, the first end surface 171 is in contact with the second end surface 181. That is, the first end surface 171 is arranged at an angle with the extension direction of the first barrier 17, and the second end surface 181 is arranged at an angle with the extension direction of the second barrier 18.

[0090] In this way, the splicing joint of the first end surface 171 and the second end surface 181 can have a longer projection on the projection plane in the thickness direction of the first buffer pad 1, thereby effectively preventing liquid or dust from flowing into the expansion reserved space 14 through the splicing joint of the first end surface 171 and the second end surface 181, effectively preventing liquid or dust from flowing into the non-permitted intrusion area s, and improving the reliability of the single battery cell 40.

[0091] Optionally, with reference to Figure 6 and Figure 7 According to some specific embodiments of the utility model, in the assembled state, the first end surface 171 is in contact with the surface of the second barrier 18 facing the expansion reserved space 14. In this way, the first end surface 171 can be a plane perpendicular to the extension direction of the first barrier 17, the machining features on the first buffer pad 1 can be reduced, and the production cost of the first buffer piece can be reduced.

[0092] Optionally, with reference to Figure 6 and Figure 7 According to some specific embodiments of the utility model, in the assembled state, the second end surface 181 is in contact with the surface of the first barrier 17 facing the expansion reserved space 14. In this way, the second end surface 181 can be a plane perpendicular to the extension direction of the second barrier 18, the machining features on the first buffer pad 1 can be reduced, and the production cost of the first buffer piece can be reduced.

[0093] With reference to Figures 8-10According to some embodiments of the utility model, the buffer section 11 is three, in the assembled state, the first buffer pad 1 defines the inflation reserved space 14 with the opening, the buffer assembly 10 still includes: the second buffer pad 2, in the assembled state, the second buffer pad 2 covers the opening of inflation reserved space 14. In the assembled state, this can make the projection of first buffer pad 1 and second buffer pad 2 on the projection plane along the thickness direction of first buffer pad 1 constitute the annular structure of head and tail, and first buffer pad 1 and second buffer pad 2 enclose the closed inflation reserved space 14, so that effectively avoid liquid or dust from the opening of the structure of first buffer pad 1 into inflation reserved space 14, effectively avoid liquid or dust into the non-permitted intrusion area s, improve the reliability of single battery cell 40.

[0094] Optionally, referring to Figure 10 , according to some specific embodiments of the utility model, in the assembled state, the end face of the two ends of second buffer pad 2 in its extension direction respectively with the surface of first stop strip 17 towards inflation reserved space 14 and the surface of second stop strip 18 towards inflation reserved space 14 contact, this can make the total length of second buffer pad 2 shorter, reduce the production cost of second buffer pad 2.

[0095] Optionally, referring to Figure 8 and Figure 9 , according to some specific embodiments of the utility model, in the assembled state, first end face 171 and second end face 181 are in contact with the surface of second buffer pad 2 towards inflation reserved space 14, which can make first buffer pad 1 and second buffer pad 2 form the upwardly extending joint seam, avoid the liquid or dust falling from the direction of pole 4 from the joint seam between first buffer pad 1 and second buffer pad 2, flow into inflation reserved space 14, effectively avoid liquid or dust into the non-permitted intrusion area s, improve the reliability of single battery cell 40.

[0096] Referring to Figure 1 , Figure 6 , Figure 8 and Figure 10 , according to the battery assembly 100 of the second aspect embodiment of the utility model, it includes: the buffer assembly 10 according to the first aspect embodiment of the utility model, a plurality of single battery cells 40, a plurality of single battery cells 40 are sequentially arranged along the third direction, and one buffer assembly 10 is clamped between adjacent two single battery cells 40, wherein the third direction is parallel to the thickness direction of buffer assembly 10.

[0097] According to the battery assembly 100 of the utility model, through the above-mentioned buffer assembly 10, the overall structure is simple, the production cost is low, the adjacent two single battery cells 40 can be better buffered and protected, the first buffer section 11 in the assembled state can effectively form better sealing for the expansion reserved space 14, better sealing effect is formed for the non-permitted intrusion area s of the single battery cell 40, effectively avoids the glue flowing into the non-permitted intrusion area s, and the reliability of the single battery cell 40 is ensured.

[0098] According to the battery pack of the third aspect of the utility model, it comprises the battery assembly 100 according to the second aspect of the utility model.

[0099] According to the battery pack of the utility model, through the above-mentioned battery assembly 100, the production cost is low, and the reliability is high.

[0100] According to the vehicle of the fourth aspect of the utility model, it comprises the battery pack according to the third aspect of the utility model.

[0101] According to the vehicle of the utility model, through the above-mentioned battery pack, the production cost is low, and the reliability is high.

[0102] In the description of the utility model, it is understood that relationship terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations.

[0103] In the description of the utility model, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the device or element indicated or implied to have a specific orientation, structure and operation, and therefore cannot be understood as limiting the utility model.

[0104] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0105] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cushioning assembly, characterized by, The first cushion has a to-be-assembled state and an assembled state. In the to-be-assembled state, all the buffer segments extend in a first direction, and all the folding segments have folding notches that are open towards a second direction, and the area of the folding notches on a projection plane in the thickness direction of the first cushion is a first area. In the assembled state, the extending directions of two adjacent buffer segments intersect, and the area of the folding notches on the projection plane in the thickness direction of the first cushion is a second area, and the second area is smaller than the first area. The first direction is perpendicular to the thickness direction of the first cushion, the second direction is perpendicular to the thickness direction of the first cushion, the first direction intersects the second direction, and the projection plane is perpendicular to the thickness direction of the first cushion. In the assembled state, the folding notches are closed. In the to-be-assembled state, the folding notches have a first joint surface and a second joint surface, the first joint surface and the second joint surface are oppositely arranged in the first direction, the first joint surface and the second joint surface are both planes, and the first joint surface intersects the second joint surface.

2. The cushioning assembly of claim 1, wherein, In the assembled state, the first joint surface and the second joint surface are in contact.

3. The cushioning assembly of claim 1, wherein, In the to-be-assembled state, the edge of the first joint surface at the opening of the folding notch is a first edge, the edge of the second joint surface at the opening of the folding notch is a second edge, the size of the first edge and the second edge in the first direction is a notch width, the intersection line of the first joint surface and the second joint surface is a folding line, the size of two adjacent folding lines in the first direction is an occlusion length, and the ratio of the notch width to the occlusion length is greater than or equal to 0.2 and less than or equal to 0.

4. In the to-be-assembled state, the included angle between the first joint surface and the second joint surface is greater than or equal to 80° and less than or equal to 160°.

4. The cushioning assembly of claim 3, wherein, In the to-be-assembled state, the folding segment is also provided with an anti-wrinkle groove, the anti-wrinkle groove is located at the intersection of the first joint surface and the second joint surface and is in communication with the folding notch.

5. The cushioning assembly of claim 3, wherein, In the to-be-assembled state, in the second direction, the surface of the first cushion away from the opening of the folding notch is a liquid blocking surface, the minimum size of the surface of the anti-wrinkle groove to the liquid blocking surface is an anti-breaking height, and the anti-breaking height is not less than 1 mm.

6. The cushioning assembly of claim 3, wherein, In the to-be-assembled state, in the second direction, the surface of the first cushion away from the opening of the folding notch is a liquid blocking surface, the minimum size of the surface of the anti-wrinkle groove to the liquid blocking surface is an anti-breaking height, and the ratio of the anti-breaking height to the thickness of the first cushion is greater than or equal to 1 and less than or equal to 3.

7. The cushioning assembly of claim 6, wherein, In the to-be-assembled state, the projection of the anti-wrinkle groove on the projection plane in the thickness direction of the first cushion is a hole.

8. The cushioning assembly of claim 6, wherein, ​ 9. The cushioning assembly of any of claims 6-8, wherein, ​ 10. The cushioning assembly of claim 9, wherein, In the state to be assembled, in the second direction, the surface of the first buffer pad away from the opening of the folding gap is a liquid blocking surface, the minimum size of the surface of the anti-wrinkle groove to the liquid blocking surface is an anti-breaking height, and the ratio of the diameter of the anti-wrinkle groove to the thickness of the first buffer pad is greater than or equal to 2 and less than or equal to 4.

11. The cushioning assembly of claim 10, wherein, The size of the first buffer pad in the second direction is a pad width, and the sum of the diameter of the anti-wrinkle groove and the thickness of the first buffer pad is not greater than half of the pad width.

12. The cushioning assembly of claim 1, wherein, In the state to be assembled, the surfaces of the folding gap on both sides of the first direction are a third seam surface and a fourth seam surface, respectively, the third seam surface has a protruding portion protruding towards the fourth seam surface, and the fourth seam surface has a recessed portion recessed away from the third seam surface. In the assembled state, the protruding portion is embedded in the recessed portion, and the third seam surface is in contact with the fourth seam surface.

13. The cushioning assembly of claim 1, wherein, The buffer segments are four, in the state to be assembled, two buffer segments at both ends in the first direction are a first stop bar and a second stop bar, respectively, the end surface of the first stop bar away from the second stop bar is a first end surface, the end surface of the second stop bar away from the first stop bar is a second end surface, and in the assembled state, the first end surface is in contact with the second end surface.

14. The cushioning assembly of claim 1, wherein, The buffer segments are three, in the assembled state, the first buffer pad defines an expansion reserved space with an opening. The buffer assembly further comprises a second buffer pad, in the assembled state, the second buffer pad covers the opening of the expansion reserved space.

15. A battery assembly characterized by, Comprising: The buffer assembly according to any one of claims 1-14; A plurality of single cells, a plurality of the single cells are sequentially arranged along a third direction, and one buffer assembly is arranged between adjacent two single cells; Wherein, the third direction is parallel to the thickness direction of the buffer assembly.

16. A battery pack, characterized by Comprising: The battery assembly according to claim 15.

17. A vehicle characterized by comprising: Comprising: The battery pack according to claim 16.

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