Battery pack

Abstract

The utility model provides a battery pack, the battery pack comprises a frame and a protective side plate, the protective side plate comprises a first protective layer, and the first protective layer is connected to the outer wall of the frame in a surrounding manner; the first protection layer comprises a plurality of grid structures, every two adjacent grid structures in the multiple grid structures are fixedly connected with each other, each grid structure comprises an annular shell with the hollow interior, an energy absorption structure and at least two reinforcing plates are arranged in each annular shell, and the at least two reinforcing plates are arranged on the two opposite sides of the energy absorption structure correspondingly; the reinforcing plate is provided with a first end and a second end which are opposite, the first end is connected to the energy absorption structure, the second end is connected to the annular shell, the energy absorption structure is connected with the inner wall of the annular shell through the reinforcing plate, the battery pack further has a first direction, and the annular shell, the energy absorption structure and the reinforcing plate all extend in the first direction.

Description

Technical Field

[0001] The utility model relates to the technical field of battery protection, in particular to a battery pack. Background Art

[0002] With the continuous development of new energy vehicles, the safety and reliability of new energy vehicles have also been receiving much attention. Among them, thermal runaway of battery packs is a major factor affecting the safety of new energy vehicles.

[0003] In the related art, in order to protect the battery pack, a protective bottom plate is usually set at the bottom of the battery pack to resist the impact from the bottom of the vehicle. However, in the actual use of new energy vehicles, the vehicle may also receive impacts from the front, back, and sides. When the vehicle body structure is not sufficient to withstand the energy brought by the collision, the body will transfer the collision to the battery pack. At this time, the protective bottom plate cannot protect the battery pack, so that the battery pack is subjected to a large external force, which may easily cause the battery pack to deform, and may affect the normal operation of the battery pack. When the collision is more serious, it may even cause adverse safety accidents such as thermal runaway or fire and explosion. Summary of the invention

[0004] The embodiment of the utility model provides a battery pack to solve the problem in the related art that the protective bottom plate does not provide sufficient protection for the battery pack, and when the vehicle is hit, the battery pack may be easily deformed, and may even cause thermal runaway or fire and explosion and other adverse safety accidents.

[0005] In order to solve the above technical problems, the utility model is achieved as follows:

[0006] An embodiment of the utility model provides a battery pack, which includes a frame and a protective side plate, wherein the protective side plate includes a first protective layer, which is connected to the outer wall of the frame in a surrounding manner; the first protective layer includes a plurality of grille structures, wherein two adjacent grille structures among the plurality of grille structures are fixedly connected to each other to form the first protective layer together, the grille structure includes an annular shell with a hollow interior, an energy absorbing structure and at least two reinforcing plates are arranged inside the annular shell, the at least two reinforcing plates are respectively arranged on two opposite sides of the energy absorbing structure, the reinforcing plate has a first end and a second end opposite to each other, the first end is connected to the energy absorbing structure, the second end is connected to the annular shell, and the energy absorbing structure is connected to the inner wall of the annular shell through the reinforcing plate; the battery pack also has a first direction, and the annular shell, the energy absorbing structure and the reinforcing plate all extend along the first direction.

[0007] Optionally, a through hole is provided on the energy absorbing structure, and the through hole extends along the first direction.

[0008] Optionally, the energy absorbing structure is a polygonal column, the number of the reinforcing plates is equal to the number of edges of the polygonal column, and the first ends of the reinforcing plates are respectively connected to the edges of the polygonal column.

[0009] Optionally, the annular shell is in the shape of a polygonal column, and the second end of the reinforcing plate is connected to an edge of the polygonal column or to a bisector of an inner wall surface of the polygonal column along the first direction.

[0010] Optionally, the annular shell is cylindrical, and a plurality of bisectors along the first direction equally divide the inner wall of the annular shell, and the second end of the reinforcing plate is connected to a plurality of bisectors of the inner wall of the annular shell.

[0011] Optionally, the battery pack also has a second direction, along which the grid structure has a first connecting wall and a second connecting wall relative to each other, the first connecting wall being connected to an outer wall of the frame, the energy absorption structure being arranged between the first connecting wall and the second connecting wall, the second end of the reinforcement plate being connected to the first connecting wall or the second connecting wall, and the first end of the reinforcement plate being connected to the energy absorption structure.

[0012] Optionally, the protective side panel also includes a second protective layer, which is located between the first protective layer and the outer wall of the frame, and is respectively connected to the first protective layer and the outer wall of the frame, and the first protective layer and the second protective layer are connected in a concave-convex manner.

[0013] Optionally, the protective side plate further includes a third protective layer, the third protective layer is connected to a side of the first protective layer facing away from the second protective layer, the third protective layer covers the first protective layer, and the first protective layer and the third protective layer are connected in a concave-convex manner.

[0014] Optionally, adhesive layers are provided on both sides of the first protective layer connecting the second protective layer and the third protective layer.

[0015] Optionally, the second protective layer and the third protective layer have the same structure as the first protective layer.

[0016] In an embodiment of the utility model, the battery pack includes a frame and a protective side plate, wherein the protective side plate includes a first protective layer. Since the first protective layer is connected to the outer wall of the frame in a surrounding manner, the first protective layer can protect the frame from the outside of the frame. When the frame is collided or squeezed, the first protective layer can be subjected to force before the frame, thereby absorbing and dispersing at least part of the collision energy, reducing the force on the frame, and avoiding the problem that the outer wall of the frame is directly damaged by force when the battery pack is subjected to external force. Wherein, the first protective layer includes a plurality of grid structures, two adjacent grid structures are fixedly connected to each other, and the plurality of grid structures can protect the frame. Specifically, the grid structure includes an energy absorbing structure, an annular shell with a hollow interior, and at least two reinforcing plates. The energy absorbing structure and the at least two reinforcing plates are all arranged inside the annular shell, and the annular shell, the energy absorbing structure and the reinforcing plate all extend along a first direction. At least two reinforcing plates are respectively arranged on opposite sides of the energy absorbing structure, and the first end of the reinforcing plate is connected to the energy absorbing structure, and the second end is connected to the annular shell, so that the reinforcing plate can connect the energy absorbing structure and the inner wall of the annular shell to form a grid structure. In addition, the energy-absorbing structure and the reinforcement plate can support the grille structure, prevent the first protective layer from being crushed after being subjected to force, and improve the strength of the first protective layer. The energy-absorbing structure can also increase the grille structure's ability to absorb collision energy, and further improve the protective effect of the first protective layer on the frame, thereby avoiding the problem of easy deformation of the battery pack, and further preventing adverse safety accidents such as thermal runaway or fire and explosion of the battery pack when the collision is more serious, thereby improving the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram showing a battery pack provided by an embodiment of the utility model;

[0018] Figure 2 One of the partial schematic diagrams of a battery pack provided by an embodiment of the utility model is shown;

[0019] Figure 3 One of the schematic diagrams showing the grid structure provided by the embodiment of the utility model;

[0020] Figure 4 A second schematic diagram showing a grid structure provided by an embodiment of the utility model;

[0021] Figure 5 A second partial schematic diagram showing a battery pack provided by an embodiment of the utility model;

[0022] Figure 6 A third partial schematic diagram of a battery pack provided in an embodiment of the utility model is shown.

[0023] Reference numerals:

[0024] 10: frame; 20: protective side plate; 21: first protective layer; 211: annular shell; 212: energy absorption structure; 213: reinforcement plate; 22: second protective layer; 23: third protective layer; 30: mounting part; 40: bottom plate; 41: installation cavity; 214: first connecting wall; 215: second connecting wall; 216: through hole; X: second direction; Y: first direction; Z: third direction; 21a-grid structure; 213a-first end; 213b-second end. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0027] like Figures 1 to 6 As shown, the battery pack includes a frame 10 and a protective side plate 20, the protective side plate 20 includes a first protective layer 21, and the first protective layer 21 is connected to the outer wall of the frame 10; the first protective layer 21 includes a plurality of grid structures 21a, and two adjacent grid structures 21a are fixedly connected to each other to form the first protective layer 21 together.

[0028] For example, a plurality of grid structures 21 a are sequentially arranged along the circumference of the frame 10 , and two adjacent grid structures 21 a are fixedly connected to each other.

[0029] The grid structure 21a includes an annular shell 211 with a hollow interior, an energy absorbing structure 212 and at least two reinforcing plates 213 are arranged inside the annular shell 211, and the at least two reinforcing plates 213 are respectively arranged on two opposite sides of the energy absorbing structure 212. The first end of the reinforcing plate 213 is connected to the energy absorbing structure 212, and the second end is connected to the annular shell 211. The energy absorbing structure 212 is connected to the inner wall of the annular shell 211 through the reinforcing plate 213.

[0030] When two adjacent grid structures 21 a are fixedly connected to each other, the annular shells 211 of the two adjacent grid structures 21 a are fixedly connected.

[0031] The battery pack also has a first direction Y, and the annular shell 211, the energy absorbing structure 212 and the reinforcing plate 213 all extend along the first direction. For example, the annular shell 211 is a cylindrical structure as a whole, and the cylindrical structure includes two open ends, and the two open ends are arranged oppositely along the first direction Y. Similarly, the energy absorbing structure 212 can also be a cylindrical structure as a whole, and the cylindrical structure includes two open ends, and the two open ends are arranged oppositely along the first direction Y. The reinforcing plate 213 is connected between the annular shell 211 and the energy absorbing structure 212, and its extension direction is the same as the extension direction of the annular shell 211 and the energy absorbing structure 212.

[0032] In an embodiment of the utility model, the battery pack includes a frame 10 and a protective side plate 20, wherein the protective side plate 20 includes a first protective layer 21. Since the first protective layer 21 is connected to the outer wall of the frame 10 in a surrounding manner, the first protective layer 21 can protect the frame 10 from the outside of the frame 10. When the frame 10 is collided or squeezed, the first protective layer 21 can be subjected to force before the frame 10, thereby absorbing and dispersing at least part of the collision energy, reducing the force on the frame 10, and avoiding the problem that the outer wall of the frame 10 is directly damaged by force when the battery pack is subjected to external force. The first protective layer 21 includes a plurality of grid structures 21a, and two adjacent grid structures 21a are fixedly connected to each other. The plurality of grid structures 21a can protect the frame 10. Specifically, the grid structure 21a includes an energy absorbing structure 212, an annular shell 211 with a hollow interior, and at least two reinforcing plates 213. The energy absorbing structure 212 and the at least two reinforcing plates 213 are all arranged inside the annular shell 211, and the annular shell 211, the energy absorbing structure 212 and the reinforcing plates 213 all extend along a first direction. At least two reinforcing plates 213 are respectively arranged on two opposite sides of the energy absorbing structure 212, and the first end of the reinforcing plate 213 is connected to the energy absorbing structure 212, and the second end is connected to the annular shell 211, so that the reinforcing plate 213 can connect the inner walls of the energy absorbing structure 212 and the annular shell 211 to form the grid structure 21a. In addition, the energy-absorbing structure 212 and the reinforcing plate 213 can support the annular shell 211, prevent the first protective layer 21 from being crushed when subjected to force, and improve the strength of the first protective layer 21. The energy-absorbing structure 212 can also increase the grid structure 21a's ability to absorb collision energy, further improve the protective effect of the first protective layer 21 on the frame 10, and avoid the problem of easy deformation of the battery pack. Further, it can prevent thermal runaway or fire and explosion of the battery pack when the collision is more serious, thereby improving the safety performance of the battery pack.

[0033] It should be noted that in the related art, in order to lower the center of gravity of the vehicle, when installing the battery pack, the battery pack is usually installed at the bottom of the vehicle. A protective bottom plate is set at the bottom of the battery pack to prevent the battery pack from being easily hit by foreign objects such as stones flying on the road, and to prevent the bottom of the battery pack from easily scraping the ground when the vehicle goes uphill or crosses the curb. Therefore, in the related art, when protecting the battery pack, only the collision position of the battery pack itself is paid attention to, and insufficient attention is paid to the collision at the vehicle level.

[0034] When a vehicle-level collision occurs, the vehicle may be subjected to external forces from the front, rear, and sides of the vehicle. When the collision is severe, the deformation of the vehicle body will squeeze the frame 10 of the battery pack, causing the frame 10 to be stressed. In the present application, since a protective side plate 20 is provided on the outer wall of the frame 10, the protective side plate 20 can protect the frame 10, which can better prevent the collision from being transmitted to the frame 10 when the vehicle collides, causing the frame 10 to be subjected to greater forces, thereby improving the overall strength of the battery pack and preventing adverse safety accidents such as thermal runaway or fire and explosion of the battery pack when the vehicle-level collision occurs.

[0035] In addition, if Figure 3 , Figure 4 As shown, in some embodiments, the energy absorbing structure 212 may be provided with a through hole 216 , and the through hole 216 extends along the first direction.

[0036] A through hole 216 is provided on the energy absorbing structure 212, and the through hole 216 extends along the first direction Y. Since the energy absorbing structure 212 extends along the first direction Y, the through hole 216 can penetrate the energy absorbing structure 212, so that the energy absorbing structure 212 can also be a hollow structure, which is conducive to absorbing energy, thereby making the energy absorbing structure 212 have better impact resistance and fatigue resistance. When the grid structure 21a is impacted by external force, the energy absorbing structure 212 can also share the impact load, thereby improving the protective effect of the first protective layer 21.

[0037] Generally speaking, the frame 10 is a rectangular parallelepiped structure with four outer walls. In order to protect the four outer walls, the protective side panels 20 are connected to the four side walls, that is, the grille structure 21a is arranged around the frame 10. Specifically, the first protective layer 21 can be the same shape as the frame 10, a hollow rectangular parallelepiped structure, and the first protective layer 21 can also be sleeved outside the frame 10, and the grille structure 21a also extends along the circumferential direction of the frame 10 and is connected to the frame 10; or, the first protective layer 21 can also be composed of four independent sub-protective layers, and the four sub-protective layers are respectively connected to the four outer walls. The specific arrangement of the first protective layer 21 is not specifically limited in the embodiment of the utility model.

[0038] In addition, in some embodiments, Figure 3 , Figure 4 As shown, the energy absorbing structure 212 may be a polygonal column, the number of the reinforcing plates 213 is equal to the number of edges of the polygonal column, and the first ends of the reinforcing plates 213 are respectively connected to the edges of the polygonal column.

[0039] The energy absorbing structure 212 is a polygonal prism, and the number of reinforcing plates 213 can be equal to the number of edges of the polygonal prism. When the reinforcing plates 213 are set, the first ends of the multiple reinforcing plates 213 are respectively connected to the multiple edges of the polygonal prism, so that the side edges of the polygonal prism can be strengthened, thereby making the energy absorbing structure 212 more impact-resistant and improving the protective effect of the first protective layer 21.

[0040] It should be noted that the energy absorbing structure 212 can be in different shapes. For example, the energy absorbing structure 212 can be a hexagonal prism. In this case, the reinforcement plates 213 can be set to six, and the six reinforcement plates 213 are respectively connected to the six side edges of the hexagonal prism structure; when the energy absorbing structure is an octagonal prism, the reinforcement plates 213 can be set to eight, and the eight reinforcement plates 213 are respectively connected to the eight side edges of the octagonal prism; of course, the energy absorbing structure 212 can also be a quadrangular prism, a decagonal prism, etc. The specific shape of the energy absorbing structure 212 and the specific number of the reinforcement plates 213 are not specifically limited in the embodiments of the utility model.

[0041] In addition, in some embodiments, Figure 3 As shown, the annular housing 211 may be in the shape of a polygonal column, and the second end of the reinforcing plate 213 is connected to the edge of the polygonal column or to the bisector of the inner wall surface of the polygonal column along the first direction.

[0042] The annular shell 211 is in the shape of a polygonal column, and the second end of the reinforcing plate 213 can be connected to the edge of the polygonal column or the bisector of the inner wall of the polygonal column along the first direction, so as to realize the connection between the energy absorption structure 212 and the annular shell 211. The reinforcing plate 213 is connected to the edge of the polygonal column or the bisector of the inner wall of the polygonal column, and can also support the annular shell 211, so that the strength of the annular shell 211 is greater, and the problem of easy damage of the annular shell 211 after being subjected to force can be prevented.

[0043] It should be noted that the annular housing 211 may be in different shapes, for example, the annular housing 211 may be in a hexagonal prism, an octagonal prism, a quadrangular prism, a decagonal prism, etc. The specific shape of the annular housing 211 is not specifically limited in the embodiment of the utility model.

[0044] In addition, in some embodiments, Figure 4 As shown, the annular shell 211 may be cylindrical, and a plurality of bisectors along the first direction Y equally divide the inner wall of the annular shell 211 , and the second end of the reinforcing plate 213 is connected to a plurality of bisectors of the cylindrical inner wall surface.

[0045] For example, a plurality of equally divided lines along the first direction Y equally divide the inner wall of the annular housing 211 to form a plurality of arc-shaped inner walls, and the angles corresponding to the respective arc-shaped inner walls are equal.

[0046] The annular shell 211 is cylindrical, and the second end of the reinforcing plate 213 can be connected to the bisector of the cylindrical inner wall surface along the first direction, so as to realize the connection between the energy absorbing structure 212 and the annular shell 211, and the reinforcing plate 213 can also support the annular shell 211, so that the strength of the annular shell 211 is greater, preventing the annular shell 211 from being easily damaged after being subjected to force.

[0047] In addition, in some embodiments, Figure 1 , Figure 3 , Figure 4 As shown, the battery pack also has a second direction X, and along the second direction X the grid structure 21a has a first connecting wall 214 and a second connecting wall 215 relative to each other, the first connecting wall 214 is connected to the outer wall of the frame 10, the energy absorption structure 212 is arranged between the first connecting wall 214 and the second connecting wall 215, the second end of the reinforcing plate 213 is connected to the first connecting wall 214 or the second connecting wall 215, and the first end of the reinforcing plate 213 is connected to the energy absorption structure 212.

[0048] The battery pack also has a second direction X, which is the direction from the inside to the outside of the frame 10. Along the second direction X, the grid structure 21a has a first connecting wall 214 and a second connecting wall 215 relative to each other, wherein the first connecting wall 214 faces the outer wall of the frame 10, and the second connecting wall 215 faces away from the outer wall of the frame 10. Therefore, the first connecting wall 214 can be connected to the outer wall of the frame 10 to connect the grid structure 21a to the frame 10, so that the grid structure 21a can weaken the collision energy received by the frame 10.

[0049] Among them, the energy absorbing structure 212 and the reinforcing plate 213 can be arranged between the first connecting wall 214 and the second connecting wall 215, and the second end of the reinforcing plate 213 can be connected to the first connecting wall 214 or the second connecting wall 215, and the first end of the reinforcing plate 213 can be connected to the energy absorbing structure 212, so that the energy absorbing structure 212 can be connected to the first connecting wall 214 and the second connecting wall 215 through the reinforcing plate 213, so that the energy absorbing structure 212 and the reinforcing plate 213 can support the grille structure 21a, improve the impact resistance of the first protective layer 21, and prevent the first protective layer 21 from being easily crushed after being subjected to force, and the energy absorbing structure 212 can also increase the grille structure 21a's ability to absorb collision energy.

[0050] In addition, in some embodiments, the first protective layer 21 is made of a highly elastic material, such as rubber or polyurethane.

[0051] The first protective layer 21 can be made of a highly elastic material, such as rubber or polyurethane, so that the first protective layer 21 has elasticity. When the frame 10 is subjected to external force, the first protective layer 21 can deform to absorb the external force, thereby improving the protective effect on the frame 10. During production, a grid structure 21a, an energy absorption structure 212, and a reinforcing plate 213 can be provided inside the first protective layer 21, so that the interior of the first protective layer 21 has a honeycomb structure, thereby improving the absorption effect of the first protective layer 21 on collision energy, and also making the battery pack lighter.

[0052] It should also be noted that the first protective layer 21 can also be made of other types of non-metallic composite materials, such as carbon fiber composite materials, aramid fiber composite materials, glass fiber materials, etc. The specific material of the first protective layer 21 is not specifically limited in the embodiment of the utility model.

[0053] In addition, in some embodiments, Figure 1 , Figure 2 As shown, the protective side panel 20 may further include a second protective layer 22, which is located between the first protective layer 21 and the outer wall of the frame 10, and is respectively connected to the first protective layer 21 and the outer wall of the frame 10, and the first protective layer 21 and the second protective layer 22 are connected in a concave-convex manner.

[0054] The second protective layer 22 is made of polymer material, such as polyethylene or ceramic.

[0055] The protective side plate 20 also includes a second protective layer 22, which is located between the first protective layer 21 and the outer wall of the frame 10, and is respectively connected to the first protective layer 21 and the outer wall of the frame 10, that is, the second protective layer 22 is connected between the first protective layer 21 and the frame 10, and the first protective layer 21 and the second protective layer 22 can jointly protect the frame 10. When a collision occurs, the external force can be first transmitted to the first protective layer 21, absorbed and dispersed by the first protective layer 21, and then transmitted to the second protective layer 22, and then absorbed by the second protective layer 22, and finally transmitted to the frame 10. That is, in the embodiment of the present application, the protective side plate 20 can absorb and weaken the external force twice, so that the force on the frame 10 is smaller, thereby improving the protective effect of the protective side plate 20 on the battery pack.

[0056] Among them, in order to make the second protective layer 22 have a better weakening effect on the external force, the second protective layer 22 can be made of polymer materials, such as polyethylene and ceramic materials. The polymer materials have good flexibility, toughness and impact resistance, which can make the second protective layer 22 have a better protective effect on the frame 10. Of course, the second protective layer 22 can also be other polymer materials, such as carbon fiber composite materials, aramid fiber composite materials, glass fiber materials, polypropylene fiber reinforced polypropylene-based composite materials, ultra-high molecular weight polyethylene fiber materials, etc. The fibrous composite material is light in material, has good toughening and energy absorption performance, and has a better absorption and weakening effect on external forces.

[0057] It should be noted that, in the embodiment of the utility model, the protective side plate 20 includes a second protective layer 22 and a first protective layer 21, which can absorb and weaken the external force twice. In addition to the above-mentioned second protective layer 22 being located between the first protective layer 21 and the outer wall of the frame 10, the second protective layer 22 can also be arranged on the outside of the first protective layer 21, and can also absorb and weaken the external force twice. The embodiment of the utility model does not limit the specific setting method of the second protective layer 22.

[0058] In addition, in some embodiments, Figure 1 , Figure 2 As shown, the protective side plate 20 may further include a third protective layer 23, which is connected to the side of the first protective layer 21 away from the second protective layer 22, and the third protective layer 23 covers the first protective layer 21, and the first protective layer 21 and the third protective layer 23 are connected in a concave-convex manner. The main material of the third protective layer 23 is high-strength synthetic fiber, such as nylon and polyester.

[0059] The protective side plate 20 also includes a third protective layer 23, which is connected to the side of the first protective layer 21 away from the second protective layer 22, that is, the second protective layer 22, the first protective layer 21, and the third protective layer 23 are stacked in sequence, the second protective layer 22 is located at the innermost side and connected to the frame 10, the third protective layer 23 is located at the outermost side, and the first protective layer 21 is located between the second protective layer 22 and the second protective layer. Since the third protective layer 23 covers the first protective layer 21, the third protective layer 23 also surrounds the outside of the frame 10, and can also protect the frame 10 from the front, back, and sides.

[0060] In the embodiment of the utility model, the first protective layer 21, the second protective layer 22, and the third protective layer 23 can jointly protect the frame 10. When a collision occurs, the external force can be first transmitted to the third protective layer 23, which first absorbs a part of it and then transmits it to the first protective layer 21; the first protective layer 21 can absorb and disperse the external force after being subjected to the force; then the external force absorbed and dispersed by the first protective layer 21 can be transmitted to the second protective layer 22, which absorbs it and finally transmits it to the frame 10. That is, in the embodiment of the present application, the protective side plate 20 can absorb and weaken the external force three times, so that the force on the frame 10 is relatively small, thereby further improving the protective effect of the protective side plate 20 on the battery pack.

[0061] It should be noted that, in order to make the third protective layer 23 have a better weakening effect on external forces, the third protective layer 23 can be made of high-strength synthetic fibers, such as nylon and polyester. The high-strength synthetic fibers are light in weight and have good toughening and energy absorption properties. They have a better absorption and weakening effect on external forces, and can make the third protective layer 23 have a better protective effect on the frame 10. Of course, the third protective layer 23 can also be made of other materials, such as carbon fiber composite materials, aramid fiber composite materials, glass fiber materials, polypropylene fiber reinforced polypropylene-based composite materials, ultra-high molecular weight polyethylene fiber materials, etc. The specific materials of the third protective layer 23 are not specifically limited in the embodiments of the utility model.

[0062] In addition, when the protective side panels 20 are provided, they can be provided layer by layer on the outer wall of the frame 10. For example, when the protective side panels 20 include a first protective layer 21, a second protective layer 22, and a third protective layer 23, the second protective layer 22 can be first connected to the outer wall of the frame 10, and then the first protective layer 21 can be connected to the second protective layer 22, and finally the third protective layer 23 can be connected to the first protective layer 21. When connecting each layer, structural adhesive bonding can be used for connection, that is, an adhesive layer is provided on both sides of the first protective layer 21 connecting the second protective layer 22 and the third protective layer 23. Alternatively, mechanical connection can be used for connection, such as bolt or rivet connection. The specific connection method of the first protective layer 21, the second protective layer 22, and the third protective layer 23 is not specifically limited in the embodiment of the utility model.

[0063] In addition, in some embodiments, the second protective layer 22 and the third protective layer 23 have the same structure as the first protective layer 21 .

[0064] In the embodiment of the utility model, the second protective layer 22 and the third protective layer 23 may have the same internal structure as the first protective layer 21, that is, the second protective layer 22 and the third protective layer 23 may also include the above-mentioned grid structure 21a. The setting of the internal grid structure 21a can make the second protective layer 22 and the third protective layer 23 have better absorption and resistance capabilities against collisions, can prevent the second protective layer 22 and the third protective layer 23 from being easily crushed after being stressed, can improve the protective effect of the frame 10, can prevent the battery pack from being deformed after being stressed, and improve the safety performance of the battery pack.

[0065] In addition, in some embodiments, Figure 5 As shown, in the second direction X, the thickness of the frame 10 is L1, the thickness of the second protective layer 22 is L2, and L1 and L2 satisfy: L2 / L1≤30%.

[0066] In the direction from the inside of the frame 10 to the outside of the frame 10, the thickness of the frame 10 is L1, and the thickness of the second protective layer 22 is L2. L1 and L2 satisfy: L2 / L1≤30%, that is, the ratio of the thickness of the second protective layer 22 to the thickness of the frame 10 is greater than 0 and less than or equal to 30%. The thickness of the second protective layer 22 can be set according to the thickness of the frame 10. When L1 and L2 satisfy L2 / L1≤30%, the second protective layer 22 can play a protective role, and it can also avoid the problem that the second protective layer 22 is thicker and affects the overall size, weight, and installation of the battery pack.

[0067] It should be noted that L2 / L1 can specifically be any value between 0 and 30% (excluding 0) or a range consisting of any two values, for example, it can be 30%, 20%, 28%, 19%, 10%, 9.8%, 10% to 25%, etc. The specific value of L2 / L1 is not specifically limited in the embodiments of the utility model.

[0068] It should also be noted that in the embodiment of the utility model, the thickness of the second protective layer 22 can be negatively correlated with the thickness of the frame 10, that is, when the thickness of the frame 10 is large, the thickness of the second protective layer 22 can be small; when the thickness of the frame 10 is small, the thickness of the second protective layer 22 can be large. For example, when the thickness of the frame 10 is 1mm, L2 / L1 can be 30%; when the thickness of the frame 10 is 2.5mm, L2 / L1 can be 10%. When the thickness of the frame 10 is large, the strength of the frame 10 is high and can withstand large external forces. At this time, the thickness of the second protective layer 22 can be slightly smaller to avoid the problem that the first protective layer 22 is set thicker, causing redundant protection of the frame 10 and increasing the production cost; when the thickness of the frame 10 is large, the strength of the frame 10 is small and cannot withstand large external forces. At this time, the thickness of the second protective layer 22 can be large to avoid the problem that the first protective layer 22 is set thinner and the protection of the frame 10 is weak.

[0069] In addition, the thickness parameter of the third protective layer 23 can be set in the same manner as the thickness of the second protective layer 22, that is, the ratio of the thickness of the third protective layer 23 to the thickness of the frame 10 can also be less than or equal to 30%. Specifically, reference can be made to the above description of the thickness of the second protective layer 22, and the embodiments of the utility model will not be repeated here. Among them, the thickness of the third protective layer 23 refers to the size between the opposite ends of the third protective layer 23 on one side of the frame 10 in the direction from the inside of the frame 10 to the outside of the frame 10.

[0070] In addition, when the third protective layer 23 and the second protective layer 22 are provided, the thickness of the third protective layer 23 and the second protective layer 22 can be consistent. When the materials of the third protective layer 23 and the second protective layer 22 are consistent, the third protective layer 23 and the second protective layer 22 are the same. The third protective layer 23 and the second protective layer 22 can be obtained by simply setting the same thickness parameter, which is convenient for manufacturing. Of course, the thickness of the third protective layer 23 and the second protective layer 22 can also be different. The specific settings of the third protective layer 23 and the second protective layer 22 are not specifically limited in the embodiments of the utility model.

[0071] In addition, in some embodiments, Figure 5 As shown, in the second direction X, the thickness of the first protective layer 21 is L3, and L3 may satisfy: L3 ≥ 1 mm.

[0072] In the direction from the inside of the frame 10 to the outside of the frame 10, the thickness of the first protective layer 21 is L3, and L3 satisfies: L3≥1mm, that is, the thickness of the first protective layer 21 is greater than or equal to 1mm, so that the thickness of the first protective layer 21 can be larger, so that the size of the grid structure 21a inside the first protective layer 21 can also be larger, which can avoid the problem of poor absorption and dispersion of collisions due to the smaller size of the grid structure 21a.

[0073] It should be noted that L3 can specifically be any value greater than or equal to 1, for example, it can be 1, 1.2, 1.36, 1.9, 2, 2.6, etc. The embodiment of the utility model does not specifically limit the specific value of L3.

[0074] In order to place the battery pack on the electrical equipment, a mounting member 30 is usually provided on the battery pack. In the embodiment of the utility model, the mounting member 30 can be arranged in different ways, and the following two are specifically described as examples:

[0075] Method 1: The battery pack has a third direction Z, the protective side panel 20 can be set in the middle of the frame 10 in the third direction Z, and the mounting part 30 is connected to the position on the outer wall of the frame 10 where the protective side panel 20 is not set, and the mounting part 30 is used to connect the electrical equipment.

[0076] The protective side panel 20 is arranged in the middle part of the frame 10 in the third direction Z, that is, the protective side panel 20 does not cover all the outer walls of the frame 10. In the third direction Z, part of the outer wall of the frame 10 is exposed. The protective side panel 10 is not arranged on this part of the frame 10, and the mounting part 30 can be connected. The battery pack can be fixed by connecting to the electrical equipment.

[0077] Generally speaking, in order to install the battery pack on the electrical equipment, a mounting part 30 is usually provided on the frame 10, and connected to the mounting point on the electrical equipment through the mounting part 30. In the present application, the protective side panel 20 is provided in the middle of the frame 10, and the protective side panel 20 is not provided at the upper and lower edges of the frame 10. The frame 10 where the protective side panel 20 is not provided can provide a connection position for the mounting part 30, which can avoid the mounting part 30 being directly connected to the protective side panel 20, thereby damaging the structure of the protective side panel 20, and avoiding the problem that when being hit, the mounting part 30 is subjected to force, causing the protective side panel 20 to be locally subjected to force, and the pressure is relatively large, resulting in the protective side panel 20 being easily crushed and damaged.

[0078] In addition, in some embodiments, in the third direction Z, the frame 10 has an upper end and a lower end opposite to each other, and the protective side plate 20 has a first end and a second end opposite to each other; the upper end of the frame 10 is close to the first end of the protective side plate 20 and away from the second end of the protective side plate 20, such as Figure 6As shown, there is a first distance H1 between the upper end of the frame 10 and the lower end of the frame 10, a second distance H2 between the upper end of the frame 10 and the first end of the protective side plate 20, and a third distance H3 between the lower end of the frame 10 and the second end of the protective side plate 20; H1, H2, and H3 can satisfy: H2 / H1≤15%, H3 / H1≤15%.

[0079] In the third direction Z, the frame 10 has a relative upper end and a lower end, and the protective side plate 20 has a relative first end and a second end, wherein the upper end of the frame 10 is close to the first end of the protective side plate 20 and away from the second end of the protective side plate 20, that is, the upper end of the frame 10 and the first end of the protective side plate 20 are located on the same side, and the lower end of the frame 10 and the second end of the protective side plate 20 are located on the same side.

[0080] There is a first distance H1 between the upper end of the frame 10 and the lower end of the frame 10, a second distance H2 between the upper end of the frame 10 and the first end of the protective side plate 20, and a third distance H3 between the lower end of the frame 10 and the second end of the protective side plate 20. This allows a gap to be directly between the first end and the second end of the protective side plate 20 and the edge of the frame 10, so that the protective side plate 20 can be set in the middle of the frame 10 in the third direction Z. The second distance between the upper end of the frame 10 and the first end of the protective side plate 20, and the third distance between the lower end of the frame 10 and the second end of the protective side plate 20 can provide installation space for the mounting component 30.

[0081] In the embodiment of the utility model, H1 and H2 satisfy: H2 / H1≤15%, that is, the ratio of the second distance H2 to the first distance H1 is less than or equal to 15%, and the distance between the upper end of the frame 10 and the first end of the protective side panel 20 can be set according to the distance between the upper end and the lower end of the frame 10. When H1 and H2 satisfy H2 / H1≤15%, sufficient installation space can be provided for the mounting component 30, and at the same time, the distance between the protective side panel 20 and the upper end of the frame 10 is smaller, thereby avoiding the problem that there are many positions at the upper end of the frame 10 where the protective side panel 20 is not set, and the protective side panel 20 does not provide sufficient protection for the upper end of the frame 10.

[0082] H1 and H3 satisfy: H3 / H1≤15%, that is, the ratio of the third distance H3 to the first distance H1 is less than or equal to 15%. The distance between the lower end of the frame 10 and the second end of the protective side plate 20 can be set according to the distance between the upper end and the lower end of the frame 10. When H1 and H3 satisfy H3 / H1≤15%, sufficient installation space can be provided for the mounting component 30, and at the same time, the distance between the protective side plate 20 and the lower end of the frame 10 can be reduced, thereby avoiding the problem that there are many positions at the lower end of the frame 10 where the protective side plate 20 is not set, and the protective side plate 20 does not provide sufficient protection for the lower end of the frame 10.

[0083] It should be noted that H2 / H1 can specifically be any value between 0 and 15% (excluding 0) or a range consisting of any two values, for example, it can be 2%, 8%, 10%, 12.5%, 15%, 10% to 15%, etc. The specific value of H2 / H1 is not specifically limited in the embodiments of the utility model.

[0084] H2 / H1 can specifically be any value between 0 and 15% (excluding 0) or a range consisting of any two values, for example, it can be 2%, 8%, 10%, 12.5%, 15%, 10% to 15%, etc. The specific value of H3 / H1 is not specifically limited in the embodiments of the present invention.

[0085] In actual settings, the values ​​of H2 / H1 and H2 / H1 can be the same. For example, H2 / H1 and H2 / H1 can both be 15%. At this time, the second distance H2 between the upper end of the frame 10 and the first end of the protective side plate 20 and the third distance H3 between the lower end of the frame 10 and the second end of the protective side plate 20 are the same, so that the positions of the upper and lower ends of the frame 10 where the protective side plate 20 is not set are symmetrical. Of course, the values ​​of H2 / H1 and H2 / H1 can also be different. The specific settings of the values ​​of H2 / H1 and H2 / H1 are not specifically limited in the embodiments of the utility model.

[0086] In addition, it should be noted that, in the protective side plate 20, the various parts of the protective side plate 20 can be flush in the third direction Z. For example, in the case where the protective side plate 20 includes the first protective layer 21, the second protective layer 22 and the third protective layer 23, in the third direction Z, the upper and lower ends of the first protective layer 21, the second protective layer 22 and the third protective layer 23 are flush, so that the position where the protective side plate 20 is provided on the frame 10 can be protected by the first protective layer 21, the second protective layer 22 and the third protective layer 23, so as to avoid the problem that the protection is relatively weak in a certain place in the middle of the frame 10; in the case where the protective side plate 20 includes the first protective layer 21 and the second protective layer 22, in the third direction Z, the upper and lower ends of the first protective layer 21 and the second protective layer 22 are flush.

[0087] Method 2: If Figure 1 , Figure 2 As shown, the battery pack also includes a base plate 40, which is connected to the frame 10 and forms an installation cavity 41, and the installation cavity 41 is used to accommodate the battery; a mounting component 30 is connected to the surface of the base plate 40 facing away from the frame 10, and a portion of the mounting component 30 extends outward from the frame 10, and the mounting component 30 is used to connect to electrical equipment.

[0088] The battery pack also includes a bottom plate 40, which can be connected to the frame 10 and form a mounting cavity 41 with the frame 10 that can accommodate a battery. When the battery pack 10 is assembled, the battery can be placed in the mounting cavity 41, and the bottom plate 40 can carry the battery. A mounting part 30 is connected to the surface of the bottom plate 40 facing away from the frame 10, and a portion of the mounting part 30 protrudes outward from the frame 10, so that the electrical equipment can be connected through the protruding portion of the mounting part 30. That is, in this embodiment, the bottom plate 40 can also provide an installation space for the mounting part 30, that is, in addition to being set at a position on the outer wall of the frame 10 where the protective side plate 20 is not set, the mounting part 30 can also be set on the bottom plate 40, so that the connection of the mounting part 30 can be achieved, and the problem that the setting of the mounting part 30 affects the strength of the protective side plate can be avoided.

[0089] It should be noted that the battery pack may also include an upper cover, the frame 10 has two openings opposite to each other in the third direction Z, the bottom plate 40 and the upper cover are spaced apart along the third direction Z, and are respectively connected at the two openings, and the upper cover may seal the installation cavity 41 to prevent the battery from being exposed and easily damaged by collision. When setting up the battery pack, the bottom plate 40 is usually located at the bottom, and the third direction Z is the direction from the upper cover to the bottom plate 40. In actual application, in order to place the battery in the installation cavity 41 upright, the third direction Z is collinear with the vertical direction.

[0090] In an embodiment of the utility model, the battery pack includes a frame 10 and a protective side plate 20, wherein the protective side plate 20 includes a first protective layer 21. Since the first protective layer 21 is connected to the outer wall of the frame 10 in a surrounding manner, the first protective layer 21 can protect the frame 10 from the outside of the frame 10. When the frame 10 is collided or squeezed, the first protective layer 21 can be subjected to force before the frame 10, thereby absorbing and dispersing at least part of the collision energy, reducing the force on the frame 10, and avoiding the problem that the outer wall of the frame 10 is directly damaged by force when the battery pack is subjected to external force. The first protective layer 21 includes a plurality of grid structures 21a, and two adjacent grid structures 21a are fixedly connected to each other. The plurality of grid structures 21a can protect the frame 10. Specifically, the grid structure 21a includes an energy absorbing structure 212, an annular shell 211 with a hollow interior, and at least two reinforcing plates 213. The energy absorbing structure 212 and the at least two reinforcing plates 213 are all arranged inside the annular shell 211, and the annular shell 211, the energy absorbing structure 212 and the reinforcing plates 213 all extend along a first direction. At least two reinforcing plates 213 are respectively arranged on two opposite sides of the energy absorbing structure 212, and the first end of the reinforcing plate 213 is connected to the energy absorbing structure 212, and the second end is connected to the annular shell 211, so that the reinforcing plate 213 can connect the inner walls of the energy absorbing structure 212 and the annular shell 211 to form the grid structure 21a. In addition, the energy-absorbing structure 212 and the reinforcing plate 213 can support the annular shell 211, prevent the first protective layer 21 from being crushed when subjected to force, and improve the strength of the first protective layer 21. The energy-absorbing structure 212 can also increase the grid structure 21a's ability to absorb collision energy, further improve the protective effect of the first protective layer 21 on the frame 10, and avoid the problem of easy deformation of the battery pack. Further, it can prevent thermal runaway or fire and explosion of the battery pack when the collision is more serious, thereby improving the safety performance of the battery pack.

[0091] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0092] Although the optional embodiments of the utility model embodiments have been described, those skilled in the art, once knowing the basic creative concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications falling within the scope of the utility model embodiments.

[0093] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0094] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. At the same time, for those skilled in the art, according to the principle and implementation method of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack, characterized in that: The battery pack comprises a frame (10) and a protective side plate (20), wherein the protective side plate (20) comprises a first protective layer (21), and the first protective layer (21) is connected around the outer wall of the frame (10); The first protective layer (21) comprises a plurality of grid structures (21a), two adjacent grid structures (21a) of the plurality of grid structures (21a) are fixedly connected to each other to form the first protective layer (21), the grid structure (21a) comprises an annular shell (211) with a hollow interior, an energy absorbing structure (212) and at least two reinforcing plates (213) are arranged inside the annular shell (211), the at least two reinforcing plates (213) are respectively arranged on two opposite sides of the energy absorbing structure (212), the reinforcing plate (213) has an opposite first end (213a) and a second end (213b), the first end (213a) is connected to the energy absorbing structure (212), the second end (213b) is connected to the annular shell (211), and the energy absorbing structure (212) is connected to the inner wall of the annular shell (211) through the reinforcing plate (213); The battery pack also has a first direction (Y), and the annular shell (211), the energy absorption structure (212) and the reinforcing plate (213) all extend along the first direction (Y).

2. The battery pack according to claim 1, characterized in that: The energy absorbing structure (212) is provided with a through hole (216), and the through hole (216) extends along the first direction (Y).

3. The battery pack according to claim 1 or 2, characterized in that: The energy absorbing structure (212) is a polygonal column, the number of the reinforcing plates (213) is equal to the number of edges of the polygonal column, and the first ends (213a) of the reinforcing plates (213) are respectively connected to the edges of the polygonal column.

4. The battery pack according to claim 3, characterized in that: The annular housing (211) is in the shape of a polygonal column, and the second end (213b) of the reinforcing plate (213) is connected to an edge of the polygonal column or to a bisector of the inner wall surface of the polygonal column along the first direction (Y).

5. The battery pack according to claim 3, characterized in that: The annular shell (211) is cylindrical, and a plurality of bisectors along the first direction (Y) equally divide the inner wall of the annular shell (211), and the second end (213b) of the reinforcing plate (213) is connected to the plurality of bisectors on the inner wall of the annular shell (211).

6. The battery pack according to claim 4, characterized in that: The battery pack also has a second direction (X), and along the second direction (X) the grid structure (21a) has a first connecting wall (214) and a second connecting wall (215) opposite to each other, the first connecting wall (214) being connected to the outer wall of the frame (10), the energy absorption structure (212) being arranged between the first connecting wall (214) and the second connecting wall (215), the second end of the reinforcing plate (213) being connected to the first connecting wall (214) or the second connecting wall (215), and the first end of the reinforcing plate (213) being connected to the energy absorption structure (212).

7. The battery pack according to claim 1, characterized in that: The protective side plate (20) further comprises a second protective layer (22), wherein the second protective layer (22) is located between the first protective layer (21) and the outer wall of the frame (10), and is respectively connected to the first protective layer (21) and the outer wall of the frame (10), and the first protective layer (21) and the second protective layer (22) are connected in a concave-convex manner.

8. The battery pack according to claim 7, characterized in that: The protective side plate (20) further comprises a third protective layer (23), wherein the third protective layer (23) is connected to a side of the first protective layer (21) facing away from the second protective layer (22), and the third protective layer (23) covers the first protective layer (21), and the first protective layer (21) and the third protective layer (23) are connected in a concave-convex manner.

9. The battery pack according to claim 8, characterized in that: Adhesive layers are provided on both sides of the first protective layer (21) connecting the second protective layer (22) and the third protective layer (23).

10. The battery pack according to claim 9, characterized in that: The second protective layer (22) and the third protective layer (23) have the same structure as the first protective layer (21).

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