Heat absorption structure, battery assembly, battery pack and power utilization system

Abstract

The embodiment of the utility model provides a heat absorption structure, a battery assembly, a battery pack and a power utilization system. The heat absorption structure comprises a heat absorption piece and a supporting frame, the heat absorbing piece is used for absorbing heat; the supporting frame is connected to the heat absorption piece and used for enhancing the structural strength of the heat absorption piece so as to avoid deformation of the heat absorption piece. Thus, the supporting frame provides stable and reliable support for the heat absorption piece, the heat absorption piece has high compression resistance, when the battery cell is subjected to thermal runaway and generates a large amount of heat, the heat absorption piece can be prevented from being extruded and deformed through the supporting effect of the supporting frame, and the expansion of the battery cell can be effectively inhibited. And the phenomenon that the thermal runaway battery cell generates thermal expansion to extrude other adjacent battery cells to deform the battery cells is avoided, so that the battery pack can keep a relatively good structural shape and the like, and the performance of the battery pack is favorably improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a heat absorption structure, a battery assembly, a battery pack, and a power system. Background Art

[0002] The battery assembly in a battery pack usually includes multiple battery cells. During operation, the battery cells generate heat and are prone to expansion and deformation. Therefore, a heat absorption structure is provided in the battery pack to suppress the thermal expansion of the battery cells.

[0003] In the prior art, a heat-absorbing structure is usually arranged between two adjacent battery cells to absorb the heat generated by the battery cells. However, in the case of thermal runaway of the battery cells, the battery cells generate a large amount of heat and are prone to expansion and deformation, which causes the heat-absorbing structure to be squeezed and deformed or even overflow the packaging structure of the battery pack, affecting the heat absorption effect. In addition, the heat-absorbing structure squeezes the adjacent battery cells, affecting the structure and performance of the battery pack. Utility Model Content

[0004] In view of the above problems, the present invention is proposed to provide a heat absorption structure, a battery assembly, a battery pack and a power system that overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a heat absorbing structure, the heat absorbing structure comprising: a heat absorbing member and a support frame;

[0007] The support frame is provided with a plurality of through holes penetrating in a thickness direction, the heat absorbing member is located in the through holes, the through holes include a first through hole and a second through hole, the support frame includes a first area and a second area connected to the first area, the first through hole is arranged in the first area, and the second through hole is arranged in the second area;

[0008] The density of the first through holes in the first region is greater than the density of the second through holes in the second region.

[0009] Optionally, the support frame includes a plurality of connecting beams and a plurality of frames;

[0010] The multiple frames are arranged along a first direction, the connecting beams are connected between two adjacent frames, and the multiple connecting beams are arranged along a second direction, wherein the first direction intersects with the second direction and the thickness direction intersects at a plane formed by the first direction and the second direction.

[0011] Optionally, the first area is a middle area of ​​the support frame, and the second area is two side areas of the support frame;

[0012] The first through hole is arranged in the middle area, and the second through hole is arranged in the two side areas.

[0013] Optionally, a distance between two adjacent frames in the first area along the first direction is a first distance, a distance between two adjacent frames in the second area along the first direction is a second distance, and the first distance is smaller than the second distance.

[0014] Optionally, the number of the second regions is two, and the two second regions are respectively arranged on both sides of the first region.

[0015] Optionally, the frame includes a first bracket, a second bracket and a reinforcement member;

[0016] The first bracket and the second bracket are spaced apart in the thickness direction, and the reinforcement is connected between the first bracket and the second bracket.

[0017] Optionally, the reinforcement member includes a plurality of support rods, and the support rods are connected between the first bracket and the second bracket.

[0018] Optionally, the reinforcement member further includes a plurality of reinforcement ribs, the plurality of support rods are arranged at intervals, and the reinforcement ribs are obliquely connected between two adjacent support rods.

[0019] Optionally, the distance between the first bracket and the second bracket is H1, the dimension of the heat absorption structure along the direction from the first bracket to the second bracket is H2, and H1 and H2 satisfy: H2*0.2≤H1≤H2*0.8, wherein the units of H1 and H2 are the same.

[0020] Optionally, the first spacing is D1, the second spacing is D2, and D1 and D2 satisfy the following relationship: D2 / 1.5≤D1≤D2 / 2, wherein the units of D1 and D2 are the same.

[0021] Optionally, a dimension of the support frame along the first direction is L1, a dimension of the middle area along the first direction is L2, and L1 and L2 satisfy: L1*0.2≤L2≤L2*0.4, wherein L1 and L2 have the same unit.

[0022] In a second aspect, an embodiment of the present application provides a battery assembly, wherein the battery assembly includes a plurality of battery cells and a plurality of the heat absorption structures described above;

[0023] The heat absorption structure is arranged between two adjacent battery cells.

[0024] Optionally, the side of two adjacent battery cells that are close to each other is a connecting surface, the heat absorption structure is arranged on the connecting surface, the size of the battery cell along the first direction is L3, the size of the heat absorption structure along the first direction is L4, and L3 and L4 satisfy: (L3-100)≤L4≤L3, wherein the units of L3 and L4 are the same.

[0025] Optionally, a size of the battery cell along the second direction is W1, a size of the heat absorption structure along the second direction is W2, and W1 and W2 satisfy: (W1-100)≤W2≤W1, wherein W1 and W2 have the same unit.

[0026] In a third aspect, an embodiment of the present application proposes a battery pack, which includes the battery assembly described above.

[0027] In a fourth aspect, an embodiment of the present application proposes a power consumption system, which includes the battery pack.

[0028] In an embodiment of the present application, the heat absorption structure includes: a heat absorption member and a support frame; the heat absorption member is used to absorb heat; the support frame is connected to the heat absorption member, the support frame is used to enhance the structural strength of the heat absorption member to avoid deformation of the heat absorption member, the support frame is provided with a plurality of through holes penetrating along the thickness direction, the through holes include a first through hole and a second through hole, the support frame includes a first area and a second area connected to the first area, the first through hole is arranged in the first area, and the second through hole is arranged in the second area; the density of the first through holes in the first area is greater than the density of the second through holes in the second area. In this way, the support frame provides a relatively stable and reliable support for the heat absorbing component, which has a strong pressure resistance. When the battery cell has thermal runaway and generates a large amount of heat, the support frame supports the heat absorbing component. Since the density of the first through holes in the first area is greater than the density of the second through holes in the second area, the first area of ​​the support frame has a greater support strength for the battery cell, and the second area of ​​the support frame has a smaller support strength for the battery cell. Therefore, the support frame has a better anti-extrusion deformation effect on the different expansion forces generated in different parts of the battery cell when thermal runaway occurs, and can have a more effective inhibitory effect on the expansion of the battery cell. It avoids the thermal expansion of the thermal runaway battery cell causing the adjacent battery cells to be squeezed and deformed, so that the battery pack can maintain a better structural shape, etc., which is conducive to improving the performance of the battery pack.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 is a structural schematic diagram of a heat absorption structure described in an embodiment of the present application;

[0032] Figure 2 It is an enlarged schematic diagram of a frame of a heat absorption structure described in an embodiment of the present application.

[0033] Figure numerals: 10 - heat absorbing element; 20 - support frame; 11 - first through hole; 12 - second through hole; 21 - connecting beam; 22 - frame; 23 - first area; 24 - second area; 221 - first bracket; 222 - second bracket; 26 - support rod; 27 - reinforcing rib; X - first direction; Y - second direction. DETAILED DESCRIPTION

[0034] The embodiments of the utility model will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "thickness", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Reference Figures 1 to 2 , showing a schematic diagram of a heat absorbing structure according to an embodiment of the present application, which may specifically include: a heat absorbing member 10 and a support frame 20;

[0039] The support frame 20 is provided with a plurality of through holes penetrating in the thickness direction, the heat absorbing member 10 is located in the through holes, the through holes include a first through hole 11 and a second through hole 12, the support frame 20 includes a first region 23 and a second region 24 connected to the first region 23, the first through hole 11 is provided in the first region 23, and the second through hole 12 is provided in the second region 24;

[0040] The density of the first through holes 11 in the first region 23 is greater than the density of the second through holes 12 in the second region 24 .

[0041] In the embodiment of the present application, the support frame 20 provides a relatively stable and reliable support for the heat absorbing member 10, which has strong pressure resistance. When the battery cell has thermal runaway and generates a large amount of heat, the support frame 20 supports the heat absorbing member 10. Since the density of the first through holes 11 in the first area 23 is greater than the density of the second through holes 12 in the second area 24, the first area 23 of the support frame 20 has a greater support strength for the battery cell, and the second area 24 of the support frame 20 has a smaller support strength for the battery cell. Therefore, the support frame 20 has a better anti-extrusion deformation effect on the different expansion forces generated in different parts of the battery cell when the battery cell is in thermal runaway, and can effectively inhibit the expansion of the battery cell. It avoids the thermal runaway battery cell from generating thermal expansion to squeeze and deform other adjacent battery cells, so that the battery pack can maintain a better structural shape, etc., which is conducive to improving the performance of the battery pack.

[0042] Specifically, Figure 1 The thickness direction of the support frame is a direction perpendicular to the plane where X and Y are located.

[0043] Specifically, in the embodiment of the present application, the density of the first through holes 11 in the first region 23 refers to the number of the first through holes 11 arranged within a preset unit area in the first region 23. Similarly, the density of the second through holes 12 in the second region 24 refers to the number of the second through holes 12 arranged within the same preset unit area in the second region 24. The density of the first through holes 11 in the first region 23 is greater than the density of the second through holes 12 in the second region 24, that is, within the same preset unit area, the number of the first through holes 11 in the first region 23 is greater than the number of the second through holes 12 in the second region 24.

[0044] For example, in the embodiment of the present application, the heat absorbing member 10 may be a hydrogel. As a phase change material, the hydrogel may absorb the heat generated by the battery cell during the phase change process, and has a good heat absorption effect to suppress the heat diffusion of the battery cell. In addition, the heat absorbing member 10 may also be aerogel to further improve the structural strength of the heat absorbing structure. The embodiment of the present application may not limit the specific type of the heat absorbing member 10.

[0045] In the embodiment of the present application, for example, the support frame 20 can be a hollow structure, so that the support frame 20 can have a certain deformation space and save materials. The support frame 20 can be rectangular, square, etc., and can be set according to actual needs. The embodiment of the present application does not limit the specific shape of the support frame 20.

[0046] Optionally, in the embodiment of the present application, the support frame 20 includes a plurality of connecting beams 21 and a plurality of frames 22; the plurality of frames 22 are arranged along the first direction X, and the plurality of connecting beams 21 are connected to the frames 22 along the second direction Y, wherein the first direction X intersects with the second direction Y, and the thickness direction intersects with the plane formed by the first direction X and the second direction Y. In this way, the support frame 20 has a strong compression resistance through the frames 22, and the plurality of frames 22 are connected to each other through the connecting beams 21, forming a relatively stable skeleton structure of the support frame 20.

[0047] Specifically, in the embodiments of the present application, Figure 2 The side view structure of the frame 22 is shown. The frame 22 may be a rectangular structure, including four beam sides, which enclose the frame 22. The frame 22 may extend in the length direction along the second direction Y. In addition, the frame 22 may also be a parallelogram structure or a square structure, etc. The specific shape structure of the frame 22 may not be limited in the embodiment of the present application.

[0048] In the embodiment of the present application, for example, a plurality of frames 22 may be arranged at intervals along the first direction X, or may be arranged adjacently along the first direction X, and the embodiment of the present application may not limit the specific connection method of the frame 22. A plurality of connecting beams 21 may be connected to the frame 22 at intervals along the second direction Y, or may be arranged adjacently along the second direction Y, and the embodiment of the present application may not limit the specific setting method of the connecting beam 21. For example, the first direction X may be arranged at an angle with the second direction Y, such as 80°, 60° or 45°, and the first direction X may also be perpendicular to the second direction Y, that is, the first direction X may be 90° with the second direction Y, and the embodiment of the present application may not limit this. For example, in the embodiment of the present application, the frame 22 may extend along the second direction Y, and the connecting beam 21 may extend along the first direction X. Each connecting beam 21 may include a first support beam and a second support beam spaced apart from each other. The first support beam may be connected to one side of the frame 22, and the second support beam may be connected to the other side of the frame 22, so that both sides of the frame 22 are connected through the first support beam and the second support beam, thereby improving the connection reliability between the connecting beam 21 and the frame 22.

[0049] It should be noted that, in the embodiment of the present application, the first direction X and the second direction Y are distinguished as different directions, and multiple frames 22 may be arranged at intervals along the second direction Y, and multiple connecting beams 21 may be connected to the frames 22 at intervals along the first direction X. The embodiment of the present application is not limited to this.

[0050] In the embodiment of the present application, optionally, the first area 23 is the middle area of ​​the support frame 20, and the second area 24 is the two side areas of the support frame 20; the first through hole 11 is arranged in the middle area, and the second through hole 12 is arranged in the two side areas. In practical applications, the middle area of ​​the battery cell is usually prone to expansion and large deformation. Therefore, the middle area of ​​the support frame 20 is correspondingly set as the first area 23, and the first through hole 11 is arranged in the first area 23. Since the density of the first through hole 11 in the first area 23 is relatively large, the structural strength of the first area 23 located in the middle position is enhanced, so that the first area 23 provides a strong compressive resistance to the middle position where the battery cell is prone to expansion, so that the support frame 20 has a better support effect. In addition, since the deformation generated by the two side positions of the battery cell is smaller than that of the middle area, the second area 24 can be correspondingly arranged on both sides of the support frame 20, and the density of the second through hole 12 in the second area 24 is relatively small, so that the support frame 20 has a good structural strength and saves the material of the support frame 20.

[0051] Optionally, in the embodiment of the present application, the spacing between two adjacent frames 22 in the first area 23 along the first direction X is a first spacing, and the spacing between two adjacent frames 22 in the second area 24 along the first direction X is a second spacing, and the first spacing is smaller than the second spacing. Specifically, by setting the spacing between two adjacent frames 22 in the first area 23 along the first direction X to be smaller, the density of the first through holes 11 in the first area 23 is larger; and by setting the spacing between two adjacent frames 22 in the second area 24 along the first direction X to be larger, the density of the second through holes 12 in the second area 24 is larger.

[0052] In the embodiment of the present application, optionally, the number of the second regions 24 is two, and the two second regions 24 are respectively arranged on both sides of the first region 23. In this way, the first region 23 having a higher arrangement density of the first through holes 11 is located in the middle of the support frame 20, and the second region 24 having a lower arrangement density of the second through holes 12 is located on both sides of the support frame 20.

[0053] Optionally, in the embodiment of the present application, the frame 22 includes a first bracket 221, a second bracket 222, and a reinforcement member; the first bracket 221 and the second bracket 222 are spaced apart in the thickness direction, the reinforcement member is connected between the first bracket 221 and the second bracket 222, and the thickness direction intersects with the plane formed by the first direction X and the second direction Y. Specifically, the thickness direction may be the thickness direction of the heat absorption structure, and for example, the thickness direction may be perpendicular to the first direction X and the second direction Y, respectively, so that the basic structure of the frame 22 is formed by the first bracket 221 and the second bracket 222, and the structural strength of the frame 22 is enhanced by the reinforcement member, so that the frame 22 can provide better compression resistance.

[0054] In the embodiment of the present application, optionally, the reinforcement member includes a plurality of support rods 26, and the support rods 26 are connected between the first bracket 221 and the second bracket 222. In this way, the first bracket 221 and the second bracket 222 are stably and reliably supported by the support rods 26, so that the first bracket 221 and the second bracket 222 have better pressure resistance.

[0055] Optionally, in the embodiment of the present application, the reinforcing member further includes a plurality of reinforcing ribs 27, the plurality of support rods 26 are arranged at intervals, and the reinforcing ribs 27 are obliquely connected between two adjacent support rods 26. In this way, by obliquely connecting the reinforcing ribs 27 between two adjacent support rods 26, a plurality of triangular structures can be formed between the reinforcing ribs 27, the support rods 26, and the first bracket 221 and the second bracket 222, thereby further improving the structural stability of the frame 22.

[0056] For example, in an embodiment of the present application, the support rod 26 can be arranged in a direction perpendicular to the first bracket 221 and the second bracket 222, and one end of the reinforcing rib 27 can abut against the end of the support rod 26. Since the support rod 26 abuts between the first bracket 221 and the second bracket 222, the end of the support rod 26 is also located between the first bracket 221 and the second bracket 222, so that the reinforcing rib 27 is interconnected with the support rod 26, the first bracket 221 and the second bracket 222, thereby improving the connection reliability.

[0057] Optionally, in the embodiments of the present application, Figure 2 As shown, the distance between the first bracket 221 and the second bracket 222 is H1, and the size of the heat absorption structure along the direction from the first bracket 221 to the second bracket 222 is H2, and H1 and H2 satisfy: H2*0.2≤H1≤H2*0.8, wherein the units of H1 and H2 are the same. In this way, the first bracket 221 and the second bracket 222 can be embedded in the heat absorption element 10, providing a better support for the heat absorption element 10, so that the heat absorption structure has a better compression resistance. In practical applications, the distance between the first bracket 221 and the second bracket 222 can be set according to the size of the heat absorption structure. For example, the distance H1 between the first bracket 221 and the second bracket 222 can be 0.2H2, 0.3H2, 0.5H2 or 0.8H2, etc., and this embodiment of the present application may not be limited to this. For example, after testing, the distance between the first bracket 221 and the second bracket 222 can be any value in the range of 0.5-5 mm, such as 0.5 mm, 1 mm, 3 mm, 5 mm, etc. The embodiment of the present application does not limit the specific value of the distance between the first bracket 221 and the second bracket 222.

[0058] In the embodiment of the present application, optionally, Figure 1 As shown, the first spacing is D1, the second spacing is D2, and D1 and D2 satisfy: D2 / 1.5≤D1≤D2 / 2, where the units of D1 and D2 are the same. In practical applications, the ratio between the first spacing D1 and the second spacing D2 is related to the expansion force ratio λ between the middle area and the two side areas of the battery cell. It is measured by experiments that the expansion force ratio λ between the middle area and the two side areas of the battery cell can be any value between 1.5 and 2. Specifically, λ can be measured by setting pressure sensors in the middle area and the two side areas of the battery cell, and then the range of D1 is obtained as D2 / 1.5-D2 / 2, so that the first spacing D1 and the second spacing D2 have a more reasonable ratio, which has a better resistance to the expansion of the battery cell.

[0059] For example, in the embodiment of the present application, the first spacing can be any value in the range of 0.2-2 mm. For example, 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, etc., and the embodiment of the present application may not limit the specific value of the first spacing. The second spacing can be any value in the range of 1-5 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc., and the embodiment of the present application may not limit the specific value of the second spacing.

[0060] In some optional embodiments of the present application, the connecting beam 21 includes a first supporting beam and a second supporting beam arranged at intervals, the first supporting beam being connected to one side of the frame 22, and the second supporting beam being connected to the other side of the frame 22. For example, the first supporting beam can be connected to the first bracket 221 of the frame 22, and the second supporting beam can be connected to the second bracket 222 of the frame 22, that is, the first supporting beam and the second supporting beam are connected to the upper and lower sides of the frame 22 respectively, so that the connecting beam 21 has a relatively stable and reliable connection effect on both sides of the frame 22. Optionally, in the embodiments of the present application, as Figure 1 As shown, the size of the support frame 20 along the first direction X is L1, and the size of the middle part 23 along the first direction X is L2, and L1 and L2 satisfy: L1*0.2≤L2≤L2*0.4, wherein the units of L1 and L2 are the same. In this way, the size of the middle part 23 along the first direction X is limited in the relationship between the middle part 23 and the support frame 20, that is, the size of the middle part 23 in the first direction X is one-fifth to two-fifths of the size of the support frame 20, so that the middle part 23 and the support frame 20 have a more reasonable size ratio, so that the middle part 23 has a better support effect on the support frame 20, so as to provide a better pressure resistance effect for the battery cell.

[0061] For example, in the embodiment of the present application, the size of the support frame 20 along the first direction X can be any value in the range of 70-1500 mm, such as 70 mm, 100 mm, 200 mm, 500 mm, 1000 mm or 1500 mm, etc., and the embodiment of the present application may not limit the specific size of the support frame 20 along the first direction X. Correspondingly, the size of the middle portion 23 along the first direction X can be 14 mm, 20 mm, 50 mm, 100 mm, 400 mm or 600 mm, etc., and the embodiment of the present application may not limit the specific size of the middle portion 23.

[0062] In the embodiment of the present application, for example, the size of the support frame 20 along the second direction Y can be any value in the range of 30-500 mm, such as 30 mm, 100 mm, 200 mm, 300 mm or 500 mm, etc. The size of the support frame 20 along the thickness direction is any value in the range of 0.5-10 mm, wherein the thickness direction is respectively perpendicular to the first direction X and the second direction Y. That is, the size of the support frame 20 in the thickness direction can be 0.5 mm, 1 mm, 3 mm, 5 mm or 10 mm, etc., and the embodiment of the present application may not limit this.

[0063] Optionally, in the embodiment of the present application, the material of the support frame 20 includes any one of plastic and metal. In this way, the use of plastic or metal makes the support frame 20 have a good structural strength, so as to provide reliable pressure resistance for the battery cell.

[0064] For example, in the embodiment of the present application, the plastic is polypropylene (PP) or polyethylene terephthalate (PET). Using polypropylene or polyethylene terephthalate can make the plastic support frame 20 have higher structural strength, provide stronger compression resistance, and is widely used and easy to obtain.

[0065] In summary, the heat absorption structure described in the embodiment of the present application can at least include the following advantages:

[0066] In an embodiment of the present application, the heat absorption structure includes: a heat absorption member and a support frame; the heat absorption member is used to absorb heat; the support frame is connected to the heat absorption member, the support frame is used to enhance the structural strength of the heat absorption member to avoid deformation of the heat absorption member, the support frame is provided with a plurality of through holes penetrating along the thickness direction, the through holes include a first through hole and a second through hole, the support frame includes a first area and a second area connected to the first area, the first through hole is arranged in the first area, and the second through hole is arranged in the second area; the density of the first through holes in the first area is greater than the density of the second through holes in the second area. In this way, the support frame provides a relatively stable and reliable support for the heat absorbing component, which has a strong pressure resistance. When the battery cell has thermal runaway and generates a large amount of heat, the support frame supports the heat absorbing component. Since the density of the first through holes in the first area is greater than the density of the second through holes in the second area, the first area of ​​the support frame has a greater support strength for the battery cell, and the second area of ​​the support frame has a smaller support strength for the battery cell. Therefore, the support frame has a better anti-extrusion deformation effect on the different expansion forces generated in different parts of the battery cell when thermal runaway occurs, and can have a more effective inhibitory effect on the expansion of the battery cell. It avoids the thermal expansion of the thermal runaway battery cell causing the adjacent battery cells to be squeezed and deformed, so that the battery pack can maintain a better structural shape, etc., which is conducive to improving the performance of the battery pack.

[0067] The embodiment of the present application also proposes a battery assembly, which includes a plurality of battery cells and a plurality of the heat-absorbing structures; the heat-absorbing structure is arranged between two adjacent battery cells. In this way, the heat-absorbing structure can resist the thermal expansion force generated by the two adjacent battery cells. The support frame 20 of the heat-absorbing structure provides a relatively stable and reliable support for the heat-absorbing element 10, which has a strong pressure resistance. For example, the heat-absorbing structure can be connected between the two adjacent battery cells, or it can be pressed between the two adjacent battery cells. The embodiment of the present application does not limit the specific arrangement between the heat-absorbing structure and the battery cell. Specifically, the heat-absorbing structure can be arranged on the side with a larger area of ​​the battery cell, which has a better inhibitory effect on the expansion force generated by the battery cell in the larger area. When the battery cell has a thermal runaway and generates a large amount of heat, the heat-absorbing element 10 can be prevented from being squeezed and deformed by the support of the support frame 20, and the expansion of the battery cell can be more effectively inhibited, which is beneficial to improve the performance of the battery assembly.

[0068] For example, in an embodiment of the present application, the battery cell may be a lithium-ion battery cell, a polymer lithium battery cell, a lithium iron phosphate battery cell, etc. The shape of the battery cell may be a rectangle or a square, etc. The embodiment of the present application may not limit the specific type and shape of the battery cell.

[0069] Optionally, in the embodiment of the present application, the side of the two adjacent battery cells that are close to each other is a connection surface, the heat absorption structure is arranged on the connection surface, the size of the battery cell along the first direction X is L3, the size of the heat absorption structure along the first direction X is L4, and L3 and L4 satisfy: (L3-100)≤L4≤L3. Specifically, the connection surface is the side with a larger area of ​​the battery cell, so that the heat absorption structure can have a larger contact area with the battery cell in the first direction X, improve the heat diffusion effect of the heat absorption structure on the battery cell, and improve the resistance to deformation caused by thermal expansion of the battery cell.

[0070] In the embodiment of the present application, for example, the size of the battery cell along the first direction X is any value of 70-1500 mm, such as 70 mm, 100 mm, 300 mm, 500 mm or 1500 mm, etc. The embodiment of the present application may not limit the specific value of the battery cell along the first direction X.

[0071] Optionally, in the embodiment of the present application, the size of the battery cell along the second direction Y is W1, the size of the heat absorption structure along the second direction Y is W2, and W1 and W2 satisfy: (W1-100)≤W2≤W1. In this way, the heat absorption structure can have a larger contact area with the battery cell in the second direction Y, improve the heat diffusion effect of the heat absorption structure on the battery cell, and improve the resistance to deformation caused by thermal expansion of the battery cell.

[0072] For example, the size of the battery cell along the second direction Y can be any value in the range of 30-500 mm, such as 30 mm, 100 mm, 200 mm, 300 mm or 500 mm, etc., and the embodiment of the present application may not limit the specific size of the battery cell along the second direction Y. The size of the battery cell along the thickness direction can be any value in the range of 6-50 mm, wherein the thickness direction is perpendicular to the first direction X and the second direction Y, respectively, that is, the size of the battery cell in the thickness direction can be 6-50 mm, such as 6 mm, 10 mm, 20 mm, 30 mm or 50 mm, etc., and the embodiment of the present application may not limit the specific size of the battery cell along the thickness direction.

[0073] The battery assembly described in the embodiment of the present application may at least have the following advantages:

[0074] In an embodiment of the present application, the battery assembly includes a plurality of battery cells and a plurality of the heat absorbing structures; the heat absorbing structure is connected between two adjacent battery cells. The heat absorbing structure includes: a heat absorbing member and a support frame; the heat absorbing member is used to absorb heat; the support frame is connected to the heat absorbing member, the support frame is used to enhance the structural strength of the heat absorbing member to avoid deformation of the heat absorbing member, the support frame is provided with a plurality of through holes penetrating along the thickness direction, the through holes include a first through hole and a second through hole, the support frame includes a first area and a second area connected to the first area, the first through hole is arranged in the first area, and the second through hole is arranged in the second area; the density of the first through hole in the first area is greater than the density of the second through hole in the second area. In this way, the support frame provides a relatively stable and reliable support for the heat absorbing component, which has a strong pressure resistance. When the battery cell has thermal runaway and generates a large amount of heat, the support frame supports the heat absorbing component. Since the density of the first through holes in the first area is greater than the density of the second through holes in the second area, the first area of ​​the support frame has a greater support strength for the battery cell, and the second area of ​​the support frame has a smaller support strength for the battery cell. Therefore, the support frame has a better anti-extrusion deformation effect on the different expansion forces generated in different parts of the battery cell when thermal runaway occurs, and can have a more effective inhibitory effect on the expansion of the battery cell. It avoids the thermal expansion of the thermal runaway battery cell causing the adjacent battery cells to be squeezed and deformed, so that the battery pack can maintain a better structural shape, etc., which is conducive to improving the performance of the battery pack.

[0075] An embodiment of the present application also provides a battery pack, which includes the battery assembly.

[0076] The battery pack described in the embodiment of the present application may at least have the following advantages:

[0077] In an embodiment of the present application, the battery pack includes the battery assembly, the battery assembly includes a plurality of battery cells and the heat absorption structure, the heat absorption structure is arranged between two adjacent battery cells, the heat absorption structure includes: a heat absorption piece and a support frame; the heat absorption piece is used to absorb heat; the support frame is connected to the heat absorption piece, the support frame is used to enhance the structural strength of the heat absorption piece to avoid deformation of the heat absorption piece, the support frame is provided with a plurality of through holes penetrating along the thickness direction, the through holes include a first through hole and a second through hole, the support frame includes a first area and a second area connected to the first area, the first through hole is arranged in the first area, and the second through hole is arranged in the second area; the density of the first through holes in the first area is greater than the density of the second through holes in the second area. In this way, the support frame provides a relatively stable and reliable support for the heat absorbing component, which has a strong pressure resistance. When the battery cell has thermal runaway and generates a large amount of heat, the support frame supports the heat absorbing component. Since the density of the first through holes in the first area is greater than the density of the second through holes in the second area, the first area of ​​the support frame has a greater support strength for the battery cell, and the second area of ​​the support frame has a smaller support strength for the battery cell. Therefore, the support frame has a better anti-extrusion deformation effect on the different expansion forces generated in different parts of the battery cell when thermal runaway occurs, and can have a more effective inhibitory effect on the expansion of the battery cell. It avoids the thermal expansion of the thermal runaway battery cell causing the adjacent battery cells to be squeezed and deformed, so that the battery pack can maintain a better structural shape, etc., which is conducive to improving the performance of the battery pack.

[0078] The embodiment of the present application also proposes an electricity consumption system, which includes the battery pack.

[0079] For example, the power consumption system may include a small car, a medium-sized car, a three-box car, a truck, a trailer, a CDV (Car Derived Van), an MPV (multi-Purpose Vehicles), an SUV (Sport Utility Vehicles), etc. The embodiment of the present application may not limit the specific type of the power consumption system.

[0080] The power consumption system described in the embodiment of the present application may at least have the following advantages:

[0081] In an embodiment of the present application, the power system includes the battery pack, the battery pack includes the battery assembly, the battery assembly includes a plurality of battery cells and the heat absorption structure, the heat absorption structure is connected between two adjacent battery cells, the heat absorption structure includes: a heat absorption member and a support frame; the heat absorption member is used to absorb heat; the support frame is connected to the heat absorption member, the support frame is used to enhance the structural strength of the heat absorption member to avoid deformation of the heat absorption member, the support frame is provided with a plurality of through holes penetrating along the thickness direction, the through holes include a first through hole and a second through hole, the support frame includes a first area and a second area connected to the first area, the first through hole is arranged in the first area, and the second through hole is arranged in the second area; the density of the first through holes in the first area is greater than the density of the second through holes in the second area. In this way, the support frame provides a relatively stable and reliable support for the heat absorbing component, which has a strong pressure resistance. When the battery cell has thermal runaway and generates a large amount of heat, the support frame supports the heat absorbing component. Since the density of the first through holes in the first area is greater than the density of the second through holes in the second area, the first area of ​​the support frame has a greater support strength for the battery cell, and the second area of ​​the support frame has a smaller support strength for the battery cell. Therefore, the support frame has a better anti-extrusion deformation effect on the different expansion forces generated in different parts of the battery cell when thermal runaway occurs, and can have a more effective inhibitory effect on the expansion of the battery cell. It avoids the thermal expansion of the thermal runaway battery cell causing the adjacent battery cells to be squeezed and deformed, so that the battery pack can maintain a better structural shape, etc., which is conducive to improving the performance of the battery pack.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation 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.

[0083] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat absorbing structure, characterized in that: The heat absorbing structure comprises: a heat absorbing member and a supporting frame; The support frame is provided with a plurality of through holes penetrating in a thickness direction, the heat absorbing member is located in the through holes, the through holes include a first through hole and a second through hole, the support frame includes a first area and a second area connected to the first area, the first through hole is arranged in the first area, and the second through hole is arranged in the second area; The density of the first through holes in the first region is greater than the density of the second through holes in the second region.

2. The heat absorption structure according to claim 1, characterized in that: The support frame includes a plurality of connecting beams and a plurality of frames; The multiple frames are arranged along a first direction, the connecting beams are connected between two adjacent frames, and the multiple connecting beams are arranged along a second direction, wherein the first direction intersects with the second direction and the thickness direction intersects at a plane formed by the first direction and the second direction.

3. The heat absorption structure according to claim 2, characterized in that: The first area is the middle area of ​​the support frame, and the second area is the two side areas of the support frame; The first through hole is arranged in the middle area, and the second through hole is arranged in the two side areas.

4. The heat absorption structure according to claim 2, characterized in that: A distance between two adjacent frames in the first region along the first direction is a first distance, a distance between two adjacent frames in the second region along the first direction is a second distance, and the first distance is smaller than the second distance.

5. The heat absorption structure according to claim 4, characterized in that: The number of the second regions is two, and the two second regions are respectively arranged on both sides of the first region.

6. The heat absorption structure according to claim 2, characterized in that: The frame includes a first bracket, a second bracket and a reinforcement member; The first bracket and the second bracket are spaced apart in the thickness direction, and the reinforcement is connected between the first bracket and the second bracket.

7. The heat absorption structure according to claim 6, characterized in that: The reinforcement member includes a plurality of support rods, and the support rods are connected between the first bracket and the second bracket.

8. The heat absorption structure according to claim 7, characterized in that: The reinforcement member further comprises a plurality of reinforcement ribs, the plurality of support rods are arranged at intervals, and the reinforcement ribs are obliquely connected between two adjacent support rods.

9. The heat absorption structure according to claim 6, characterized in that: The distance between the first bracket and the second bracket is H1, the dimension of the heat absorption structure along the direction from the first bracket to the second bracket is H2, and H1 and H2 satisfy: H2*0.2≤H1≤H2*0.8, wherein the units of H1 and H2 are the same.

10. The heat absorption structure according to claim 4, characterized in that: The first spacing is D1, the second spacing is D2, and D1 and D2 satisfy the following: D2 / 1.5≤D1≤D2 / 2, wherein the units of D1 and D2 are the same.

11. The heat absorption structure according to claim 3, characterized in that: The dimension of the support frame along the first direction is L1, the dimension of the middle area along the first direction is L2, and L1 and L2 satisfy: L1*0.2≤L2≤L2*0.4, wherein the units of L1 and L2 are the same.

12. The heat absorption structure according to claim 1, characterized in that: The heat absorbing element is made of hydrogel.

13. A battery assembly, characterized in that: The battery assembly comprises a plurality of battery cells and a heat absorption structure as claimed in any one of claims 1 to 12; The heat absorption structure is arranged between two adjacent battery cells.

14. The battery assembly according to claim 13, characterized in that: The side where two adjacent battery cells are close to each other is a connecting surface, the heat absorption structure is arranged on the connecting surface, the size of the battery cell along the first direction is L3, the size of the heat absorption structure along the first direction is L4, and L3 and L4 satisfy: (L3-100)≤L4≤L3, wherein the units of L3 and L4 are the same.

15. The battery assembly according to claim 13, characterized in that: The size of the battery cell along the second direction is W1, the size of the heat absorption structure along the second direction is W2, and W1 and W2 satisfy the following: (W1-100)≤W2≤W1, wherein the units of W1 and W2 are the same.

16. A battery pack, characterized in that: The battery pack comprises the battery assembly according to any one of claims 13 to 15.

17. An electricity system, characterized in that: The power system includes the battery pack according to claim 16 or the battery assembly according to any one of claims 13-15.

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