Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and relates to the technical field of batteries. The battery pack comprises a box body provided with a cavity; the battery pack is arranged in the cavity; the protection assembly is arranged on one side of the battery pack in the first direction; the protection assembly comprises a first protection plate, a second protection plate, a third protection plate, a first buffering piece and a second buffering piece, the first protection plate, the second protection plate and the third protection plate are arranged in a stacked mode in the first direction and connected, and a plurality of first buffering spaces are formed between the first protection plate and the second protection plate; a plurality of first buffer spaces are formed between the first protection plate and the third protection plate, first buffer parts are contained in the first buffer spaces, a plurality of second buffer spaces disconnected from the first buffer spaces are formed between the second protection plate and the third protection plate, and second buffer parts are contained in the second buffer spaces. According to the protection assembly, the scratch resistance and impact resistance of the battery pack are improved, the weight of the protection assembly is light, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery pack and an electrical device. Background Art

[0002] The contemporary automotive industry is undergoing revolutionary changes, that is, traditional fuel vehicles are gradually being replaced by new energy vehicles, and among them, electric vehicles, as a type of new energy vehicle, are emerging. In order to meet the requirement of high cruising range, most electric vehicles arrange the power battery under the vehicle body. Since the bottom area of the power battery pack is large and not protected by the body structure, and the bottom of the power battery pack is easily scratched and impacted, which may cause damage to the battery pack and even lead to fire or explosion. Summary of the Utility Model

[0003] The purpose of the present utility model is to provide a battery pack and an electrical device to solve the technical problem that the battery pack is damaged due to poor scratch resistance and anti-impact ability at the bottom of the battery pack.

[0004] In a first aspect, the present application provides a battery pack having a first direction, a second direction, and a third direction that intersect pairwise. The battery pack includes: a box body provided with a cavity; a battery pack disposed in the cavity; and a protection component disposed on one side of the battery pack in the first direction. Wherein, the protection component includes: a first protection plate, a second protection plate, a third protection plate, a first buffer member, and a second buffer member. The first protection plate, the second protection plate, and the third protection plate are stacked and connected along the first direction. A plurality of first buffer spaces are formed between the first protection plate and the second protection plate, and the first buffer spaces accommodate the first buffer member. A plurality of second buffer spaces that are disconnected from the first buffer spaces are formed between the second protection plate and the third protection plate, and the second buffer spaces accommodate the second buffer member.

[0005] In some embodiments, each of the first buffer spaces and each of the second buffer spaces are alternately distributed in the second direction and the third direction, and the first buffer members and the second buffer members are alternately distributed in the second direction and the third direction.

[0006] In some embodiments, the second protection plate includes a convex structure and a concave structure, and the convex structure and the concave structure are alternately distributed in the second direction and the third direction. The first protection plate is disposed on one side of the concave structure in the first direction, the first protection plate is connected to the concave structure and cooperates with the convex structure to enclose the first buffer space. The third protection plate is disposed on the other side of the second protection plate in the first direction, and the third protection plate cooperates with the concave structure to enclose the second buffer space.

[0007] In some embodiments, the third protective plate includes a plurality of first protective ribs and a plurality of second protective ribs, and the first protective ribs and the second protective ribs jointly enclose a first opening; the second buffer member includes a plurality of first buffer ribs and a plurality of second buffer ribs, and the first buffer ribs and the second buffer ribs jointly enclose a second opening; wherein, the second opening communicates with the first opening, the edge of the first opening overlaps on the convex structure, and at least a part of the convex structure is located within the first opening and the second opening.

[0008] In some embodiments, the second protective plate includes a flat plate portion, a convex platform portion and a connecting portion. The flat plate portion and the convex platform portion are spaced apart in a first direction. The flat plate portion is disposed on the first protective plate, and the connecting portion is connected between the flat plate portion and the convex platform portion; the connecting portion is disposed at an angle with the flat plate portion and the convex platform portion respectively; wherein, the convex platform portion and a plurality of connecting portions cooperate to form a convex structure, and the flat plate portion and any two adjacent connecting portions cooperate to form a concave structure.

[0009] In some embodiments, the convex platform portion includes a first step surface and a second step surface that are spaced apart from each other in the first direction. A part of the third protective plate overlaps on the first step surface, and the third protective plate is flush with the second step surface on the side away from the first protective plate.

[0010] In some embodiments, the orthographic projection of the first buffer member on the first protective plate overlaps partially with the orthographic projection of the second buffer member on the first protective plate.

[0011] In some embodiments, the first buffer member and the second buffer member each include an outer wrapping layer and a filler filled in the outer wrapping layer. Wherein, the material of the filler includes non-Newtonian fluid; alternatively, the first buffer member includes an outer wrapping layer and a filler filled in the outer wrapping layer, and the materials of the filler and the second buffer member both include non-Newtonian fluid.

[0012] In some embodiments, the box body includes a plurality of side plates. The first protective plate is connected to one end of the side plates in a first direction, and the first protective plate and the plurality of side plates cooperate to enclose a cavity.

[0013] In some embodiments, the battery pack further includes: a separator disposed on the side of the third protective plate away from the first protective plate.

[0014] In a second aspect, the present application further provides an electrical device, including the above-mentioned battery pack, and the battery pack serves as a power supply for the electrical device.

[0015] The technical effect of the present utility model is that the battery pack of the present application uses three layers of protection plates as the protection component (which can be called the bottom protection plate) of the battery pack. While increasing the scratch and impact resistance of the battery pack, it can also make the protection component lighter in weight and lower the cost. At the same time, the present application sets a first buffer member between the first protection plate and the second protection plate, and sets a second buffer member between the second protection plate and the third protection plate. Moreover, the first buffer member and the second buffer member are alternately arranged in two directions, namely the length direction (the second direction) and the width direction (the third direction) of the battery pack, to ensure that the bottom of the battery pack is covered by the buffer members. When the battery pack is impacted by an external force, it can buffer the external force well. In addition, when the battery pack undergoes thermal runaway, the first buffer member and the second buffer member can absorb the heat generated by the monomer battery and delay the occurrence of thermal diffusion, thereby reducing risks such as fire or explosion. The electrical device of the present application, by adopting the above-mentioned battery pack, enables the vehicle to have good protection performance and is beneficial to improving the safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following will clearly show the technical solutions and other beneficial effects of the present application by describing the specific embodiments of the present application in detail with reference to the accompanying drawings.

[0017] Figure 1 It is an exploded view of the battery pack provided by an embodiment of the present application.

[0018] Figure 2 It is an exploded view of the protection component provided by an embodiment of the present application.

[0019] Figure 3 is Figure 1 a partial enlarged view of the second protection plate in

[0020] Figure 4 It is a plan view of the protection component provided by an embodiment of the present application.

[0021] Figure 5 is Figure 4 a partial sectional view along the A-A direction in

[0022] Figure 6 is Figure 1 a sectional view of the first buffer member in the third direction in

[0023] The reference numerals of the components in the drawings are as follows:

[0024] 1 box body; 10 cavity; 11 bottom plate; 12 side plates; 13 box cover;

[0025] 2 battery pack;

[0026] 3 protection component; 31 first protection plate; 32 second protection plate; 33 third protection plate; 34 first buffer member; 35 second buffer member;

[0027] 310 First buffer space; 320 Second buffer space;

[0028] 321 Protrusion structure; 322 Depression structure;

[0029] 3301 First protective rib; 3302 Second protective rib; 331 First opening;

[0030] 3501 First buffer rib; 3502 Second buffer rib; 351 Second opening;

[0031] 211 Flat part; 212 Boss part; 213 Connecting part; 2111 First step surface; 2112 Second step surface;

[0032] 301 Outer wrapping layer; 302 Filler;

[0033] 4 Isolation member;

[0034] 5 Fixing member; 51 First through hole; 52 Second through hole; 53 Third through hole;

[0035] Z First direction; X Second direction; Y Third direction. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation words such as "upper", "lower", "left", and "right" generally refer to the upper, lower, left, and right in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings.

[0037] In the present application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximately parallelism commonly recognized in engineering. For example, "parallel" means that the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is in the state of -1° to 1°; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximately perpendicularity commonly recognized in engineering. For example, "perpendicular" means that the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is in the state of 89° to 91°. Equal distance or equal angle includes not only the case of absolute equality, but also the case of approximately equality commonly recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0038] In this application, unless otherwise clearly defined and limited, terms such as "connected", "connected to", and "stacked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] An embodiment of this application provides a battery pack. The battery includes a first direction, a second direction, and a third direction that intersect pairwise. The battery pack includes a box body, a battery pack, and a protection component. The box body is provided with a cavity. The battery pack is disposed in the cavity. The protection component is disposed on one side of the battery pack in the first direction. The protection component includes a first protection plate, a second protection plate, a third protection plate, a first buffer member, and a second buffer member. The first protection plate, the second protection plate, and the third protection plate are stacked and connected along the first direction. A plurality of first buffer spaces are formed between the first protection plate and the second protection plate, and the first buffer spaces accommodate the first buffer member. A plurality of second buffer spaces that are disconnected from the first buffer spaces are formed between the second protection plate and the third protection plate, and the second buffer spaces accommodate the second buffer member. The protection component of this application uses three protection plates, which can enhance the structural strength of the battery pack and increase the anti-scratching and anti-impact capabilities of the battery pack, thereby reducing the risk of damage to the battery pack. The following will be described in detail.

[0040] As Figure 1 shown, an embodiment of this application provides a battery pack having a first direction Z, a second direction X, and a third direction Y that intersect pairwise. The battery pack includes a box body 1, a battery pack 2, and a protection component 3. Preferably, the first direction Z, the second direction X, and the third direction Y are perpendicular to each other pairwise.

[0041] The box body 1 is provided with a cavity 10. The battery pack 2 is disposed in the cavity 10. The protection component 3 is disposed on one side of the battery pack 2 in the first direction Z, which can enhance the structural strength of the box body 1 and increase the anti-scratching and anti-impact capabilities of the battery pack, thereby reducing the risk of damage to the battery pack.

[0042] It can be understood that the protection component 3 can be disposed between the bottom of the box body 1 and the battery pack 2, or the protection component 3 is connected to the box body 1 to form a space for accommodating the battery pack 2, that is, the protection component 3 can simultaneously serve as the bottom wall of the box body 1; in addition, the protection component 3 can also be disposed on the side of the battery pack 2 away from the bottom of the box body 1.

[0043] Among them, a protection component 3 is arranged between the bottom of the box body 1 and the battery pack 2, that is, to protect the bottom of the battery pack 2, so as to enhance the scratch and impact resistance of the bottom of the box body 1. A protection component 3 is arranged on the side of the battery pack 2 away from the bottom of the box body 1, that is, to protect the top of the battery pack 2. In this way, when the battery pack is scratched or impacted, the battery pack 2 can be prevented from being damaged, thereby reducing the occurrence of accidents. At the same time, a protection component 3 is arranged between the bottom of the box body 1 and the battery pack 2 and on the side of the battery pack 2 away from the bottom of the box body 1. In this way, both the bottom and the top of the battery pack 2 can be protected, thereby further improving the scratch and impact resistance of the battery pack.

[0044] The above-mentioned scratch and impact resistance refers to the ability of the battery pack to maintain the structural integrity and safety of the battery pack when it can withstand external impacts or collisions.

[0045] As Figure 1 shown, the box body 1 has a bottom plate 11 and side plates 12. The box body 1 has an opening and a bottom plate 11 opposite to the opening, a bottom plate 11 and a plurality of side plates 12. The plurality of side plates 12 are connected to the bottom plate 11 and enclose a cavity 10. The battery pack further includes a box cover 13, and the box cover 13 covers the opening.

[0046] The battery pack 2 includes a plurality of single cells, and the plurality of single cells are arranged in sequence in the second direction X and the third direction Y. Among them, the length direction of each single cell extends along the third direction Y, and the width direction of each single cell extends along the second direction X. The single cell includes but is not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and the embodiments of the present disclosure do not limit this.

[0047] As Figure 1 、 Figure 2 、 Figure 4 And Figure 5 shown, the protection component 3 includes a first protection plate 31, a second protection plate 32, a third protection plate 33, a first buffer member 34 and a second buffer member 35. The first protection plate 31, the second protection plate 32 and the third protection plate 33 are stacked and connected along the first direction Z. A plurality of first buffer spaces 310 are formed between the first protection plate 31 and the second protection plate 32, and the first buffer spaces 310 accommodate the first buffer member 34. A plurality of second buffer spaces 320 that are disconnected from the first buffer spaces 310 are formed between the second protection plate 32 and the third protection plate 33, and the second buffer spaces 320 accommodate the second buffer member 35.

[0048] As Figure 5As shown, each first buffer space 310 and each second buffer space 320 are alternately distributed in the second direction X and the third direction Y, and the first buffer member 34 and each second buffer member 35 are alternately distributed in the second direction X and the third direction Y. In this way, the first buffer member 34 and the second buffer member 35 can be alternately distributed in the second direction X and the third direction Y. When the battery pack is subjected to an external impact, the first buffer member 34 and the second buffer member 35 can buffer the external force well, so that the overall protection component 3 exhibits good impact resistance, that is, the structural strength of the protection component 3 is enhanced.

[0049] As Figure 1 and Figure 2 shown, the first protection plate 31 is a plate-shaped member, and the size of the first protection plate 31 is the same as the size of the bottom plate 11 of the box body 1. The first protection plate 31 has the functions of anti-impact and anti-abnormal noise.

[0050] In some embodiments, the first protection plate 31 can be used as the bottom plate 11 of the box body 1. The first protection plate 31 is connected to one end of the side plate 12 in the first direction Z, and the first protection plate 31 and a plurality of side plates 12 cooperate to enclose a cavity 10. In this way, the protection component 3 can be used as the bottom protection plate of the box body 1, and this design can make the weight of the bottom protection plate lighter and reduce the cost.

[0051] As Figure 3 shown, the second protection plate 32 includes a convex structure 321 and a concave structure 322. The convex structure 321 and the concave structure 322 are alternately distributed in the second direction X and the third direction Y, that is, arranged in the following manner: concave structure 322, convex structure 321, concave structure 322... In this way, the second protection plate 32 presents a structure with ups and downs, so as to increase the structural strength of the second protection plate 32.

[0052] The above-mentioned second protection plate 32 can form the convex structure 321 and the concave structure 322 through processes such as stamping. By enhancing the structural strength of the second protection plate 32, the structural strength of the entire protection component 3 is further enhanced.

[0053] As Figure 3 and Figure 5As shown, in some embodiments, the first protective plate 31 is disposed on one side of the recessed structure 322 in the first direction Z. The first protective plate 31 is connected to the recessed structure 322 and cooperates with the protruding structure 321 to enclose a first buffer space 310. The third protective plate 33 is disposed on the other side of the second protective plate 32 in the first direction Z. The third protective plate 33 cooperates with the recessed structure 322 to enclose a second buffer space 320. It can be understood that the first protective plate 31 is disposed below the second protective plate 32, the third protective plate 33 is disposed above the second protective plate 32, the first protective plate 31 is connected to the recessed structure 322 to enclose the first buffer space 310, the third protective plate 33 is connected to the recessed structure 322 to enclose the second buffer space 320, and the first buffer space 310 and the second buffer space 320 are alternately arranged in the second direction X and the third direction Y, that is, arranged in the following manner: the second buffer space 320, the first buffer space 310, the second buffer space 320...

[0054] The first buffer space 310 and the second buffer space 320 are alternately arranged in the second direction X and the third direction Y, which can enable the first buffer member 34 disposed in the first buffer space 310 and the second buffer member 35 disposed in the second buffer space 320 to be alternately arranged in the second direction X and the third direction Y. In this way, the first buffer member 34 and the second buffer member 35 can cover the entire bottom of the battery pack. When the battery pack is subjected to an external impact, it can buffer the external force well, so that the overall protection component 3 exhibits good impact resistance.

[0055] The above-mentioned protection component 3 has three layers of composite protective plates, and the second protective plate 32 has a protruding structure 321 and a recessed structure 322, so that the overall protection component 3 presents a structure with ups and downs, so as to enhance the structural strength of the box body 1 and increase the scratch and impact resistance of the battery pack, thereby reducing the risk of damage to the battery pack.

[0056] As Figure 5 shown, in some embodiments, the second protective plate 32 includes a flat plate portion 211, a convex platform portion 212, and a connecting portion 213. The flat plate portion 211 and the convex platform portion 212 are spaced apart in the first direction Z. The flat plate portion 211 is disposed on the first protective plate 31, and the connecting portion 213 is connected between the flat plate portion 211 and the convex platform portion 212.

[0057] In some embodiments, the connecting portion 213 is disposed at an angle with respect to the flat portion 211 and the boss portion 212 respectively. It can be understood that the connecting portion 213 is obliquely connected between the flat portion 211 and the boss portion 212 to enhance the structural strength of the second protective plate 32. Optionally, the angle formed between the flat portion 211 and the connecting portion 213 is an obtuse angle, and the angle formed between the boss portion 212 and the connecting portion 213 is also an obtuse angle. Among them, the value range of these two angles is 90° to 180°. It can be understood that the value (unit: °) of the angle formed between the flat portion 211 and the connecting portion 213 and the angle formed between the boss portion 212 and the connecting portion 213 can be any one of 90, 100, 110, 120, 130, 140, 150, 160, 170, 180 or a value between any two of these values.

[0058] In some embodiments, when the flat portion 211 is parallel to the boss portion 212 in the first direction Z, the angle formed between the flat portion 211 and the connecting portion 213 and the angle formed between the boss portion 212 and the connecting portion 213 are alternate interior angles, that is, the angles of the two angles are equal.

[0059] As Figure 3 and Figure 5 shown, in some embodiments, the boss portion 212 and the plurality of connecting portions 213 cooperate to form a convex structure 321, and the flat portion 211 and any two adjacent connecting portions 213 cooperate to form a concave structure 322 to increase the structural strength of the second protective plate 32.

[0060] As Figure 5 shown, in some embodiments, the boss portion 212 includes a first step surface 2111 and a second step surface 2112 that are spaced apart from each other in the first direction Z. A part of the third protective plate 33 overlaps on the first step surface 2111, and the third protective plate 33 is flush with the second step surface 2112 on the side away from the first protective plate 31. In this way, a flat surface can be provided for the battery pack 2 to better support the battery pack 2.

[0061] As Figure 3 and Figure 5 shown, the above-mentioned first protective plate 31 and the second protective plate 32 are seamlessly connected at the connection (the position where the flat portion 211 is located), that is, the first buffer space 310 formed by the cooperation of the first protective plate 31 and the convex structure 321 has a good sealing effect. Even when the first buffer member 34 in the form of a liquid is filled in the first buffer space 310, the battery pack will not be damaged due to poor sealing performance.

[0062] The above-mentioned third protective plate 33 and the second protective plate 32 can be seamlessly connected at the connection, that is, the second buffer space 320 formed by the cooperation of the concave structure 322 of the second protective plate 32 and the third protective plate 33 has a good sealing effect. Even when the second buffer member 35 in the form of a liquid is filled in the second buffer space 320, the battery pack will not be damaged due to poor sealing performance.

[0063] As Figure 2 shown, in some embodiments, the third protective plate 33 includes a plurality of first protective ribs 3301 and a plurality of second protective ribs 3302. The first protective ribs 3301 and the second protective ribs 3302 jointly enclose a first opening 331. The second buffer member 35 includes a plurality of first buffer ribs 3501 and a plurality of second buffer ribs 3502. The first buffer ribs 3501 and the second buffer ribs 3502 jointly enclose a second opening 351. The second opening 351 communicates with the first opening 331. The edge of the first opening 331 overlaps on the convex structure 321, and at least part of the convex structure 321 is located in the first opening 331 and the second opening 351. The edge of the first opening 331 overlaps on the convex structure 321 to realize the connection between the second protective plate 32 and the third protective plate 33 and form the second buffer space 320.

[0064] Specifically, a plurality of first protective ribs 3301 are arranged at intervals along the second direction X, a plurality of second protective ribs 3302 are arranged at intervals along the third direction Y, and the plurality of first protective ribs 3301 and the plurality of second protective ribs 3302 are cross-arranged to form a plurality of first openings 331. A plurality of first buffer ribs 3501 are arranged at intervals along the second direction X, a plurality of second buffer ribs 3502 are arranged at intervals along the third direction Y, and the plurality of first buffer ribs 3501 and the plurality of second buffer ribs 3502 are cross-arranged to form a plurality of second openings 351.

[0065] The first buffer rib 3501 extending along the second direction X is arranged in the concave structure 322 in the second direction X, and the second buffer rib 3502 extending along the third direction Y is arranged in the concave structure 322 in the third direction Y. That is, the second buffer space 320 is filled by the first buffer rib 3501 and the second buffer rib 3502 to form the concave-convex second buffer member 35. When the protection component 3 is subjected to an external impact, the concave-convex second buffer member 35 can buffer the external force well, so that the bottom of the battery pack as a whole shows good impact resistance, that is, the structural strength of the bottom of the battery pack is enhanced.

[0066] The size of the first opening 331 is slightly smaller than that of the second opening 351. In this way, when the third protective plate 33 is disposed on the second buffer member 35, the upper surface of the third protective plate 33 is flush with the upper surface of the boss portion 212. Thus, a flat surface can be provided for the battery pack 2 to better support the battery pack 2.

[0067] The first opening 331 is formed in the third protective plate 33 described above, and the second opening 351 is formed in the second buffer member 35, which is beneficial to reducing the weight of the entire protective component 3, so as to well control and reduce costs.

[0068] As Figure 1 or Figure 2 shown, in some embodiments, the materials used for the first protective plate 31, the second protective plate 32, and the third protective plate 33 are all metal materials. Among them, the structures of the first protective plate 31, the second protective plate 32, and the third protective plate 33 can each be selected from one of aluminum plate - aluminum plate, aluminum plate - steel plate, and steel plate - steel plate.

[0069] As Figure 1 、 Figure 2 、 Figure 4 and Figure 5 shown, at the joints between the first protective plate 31 and the second protective plate 32, and between the second protective plate 32 and the third protective plate 33, they can all be connected by welding. Between the first protective plate 31 and the first buffer member 34, between the first buffer member 34 and the second protective plate 32, between the second protective plate 32 and the second buffer member 35, and between the second buffer member 35 and the third protective plate 33, they are respectively connected by bonding or hot pressing.

[0070] In some embodiments, the materials used for the first protective plate 31 and the third protective plate 33 are both composite materials. Among them, the structures of the first protective plate 31 and the third protective plate 33 can be selected from aluminum plate - PP composite fiberglass or steel plate - PCM (phase change material). Among them, aluminum plate - PP composite fiberglass is a composite material composed of an aluminum plate and polypropylene (PP) composite fiberglass. Steel plate - PCM (phase change material) is a composite material composed of a steel plate and a phase change material.

[0071] The orthographic projection of the first buffer member 34 on the first protective plate 31 partially overlaps with the orthographic projection of the second buffer member 35 on the first protective plate 31. Thus, the bottom of the battery pack is covered by the structures of the two buffer members. When an external force impacts the bottom of the battery pack, the two buffer members can buffer the external force well, making the entire protective component 3 exhibit good impact resistance.

[0072] In some embodiments, both the first buffer member 34 and the second buffer member 35 include an outer wrapping layer 301 and a filler 302 filled in the outer wrapping layer 301. Among them, the material of the filler 302 includes non-Newtonian fluid. In some other embodiments, the first buffer member 34 includes an outer wrapping layer 301 and a filler 302 filled in the outer wrapping layer 301, and the materials of both the filler 302 and the second buffer member 35 include non-Newtonian fluid. Therefore, when the battery pack is violently impacted, the first buffer member 34 and the second buffer member 35 can quickly harden, further protecting the battery pack 2 and reducing the risk of explosion or liquid leakage.

[0073] It should be noted that Figure 6 The structure shown schematically is a cross-sectional view of the first buffer member 34 in the third direction, mainly showing that the filler 302 inside the first buffer member 34 is wrapped by the outer wrapping layer 301. When the second buffer member 35 includes an outer wrapping layer 301 and a filler 302, the cross-sectional view of the second buffer member 35 is Figure 6 substantially the same.

[0074] The material of the above-mentioned outer wrapping layer 301 can be one of polyethylene terephthalate (PET) film, polyimide film (PI), and aluminum-plastic film. Even in a very thin state, these materials have good toughness and ductility, thus avoiding breakage during use and causing the non-Newtonian fluid to spill out.

[0075] It should be noted that the non-Newtonian fluid is of the shear thickening fluid type. Under high-speed impact, its apparent viscosity changes greatly, even changing from a liquid phase to a solid phase, and it will exhibit the anti-impact performance of a solid. After the impact force is eliminated, it quickly changes back from the solid phase to the liquid phase. This shear thickening effect is a non-Newtonian fluid behavior, and its change is reversible. The principle is as follows: When the non-Newtonian fluid material is not subjected to external pressure, the movement between its internal molecules is relatively open, the molecules are weakly connected, and the molecules inside the non-Newtonian fluid material can move relatively freely, presenting a liquid or semi-liquid state; when the non-Newtonian fluid material undergoes violent deformation due to external pressure, the originally loose molecules are concentrated due to the external force (shear thickening), and the connection force between the molecules will also become strong. The greater the impact force, the greater the resulting deformation, and the stronger the molecular connection force in the non-Newtonian fluid material, thus playing a resistance role.

[0076] Non-Newtonian fluids have a relatively large specific heat capacity, and the general specific heat capacity range is 2000 - 4200 J / kg / K. Non-Newtonian fluids can absorb the heat generated by battery cells, delay the occurrence of thermal diffusion, and thus reduce risks such as fire or explosion. Moreover, non-Newtonian fluids remain in a fluid state even below -30°C, that is, they have a low freezing point. In this way, when the battery pack is in a stationary state or the strain rate it experiences is low, the fluid will not solidify.

[0077] The structure of the second protective plate 32 in the embodiment of the present application is used to separate the first buffer member 34 from the second buffer member 35. When the battery pack is subjected to an external impact, the fluids of the first buffer member 34 and the second buffer member 35 are independently fixed, avoiding the phenomenon of uneven distribution of the fluid at the bottom of the battery pack due to fluid cross-flow.

[0078] The battery further includes a separator 4, which is disposed on the side of the third protective plate 33 away from the first protective plate 31, that is, the separator 4 is disposed between the third protective plate 33 and the battery pack 2 to achieve the effects of insulation and fire prevention. Among them, the separator 4 can be a plate-like member or a coating. Figure 2 What is shown is that the separator 4 is a plate-like member structure. When the separator 4 is a coating, the coating can be disposed on the side of the third protective plate 33 close to the battery pack 2, or can completely cover the third protective plate 33, and no special limitation is made here.

[0079] The battery further includes a fixing member 5, which is used to fix the first protective plate 31, the second protective plate 32, and the third protective plate 33. Among them, the first protective plate 31 is provided with a first through hole 51, the second protective plate 32 is provided with a second through hole 52 communicating with the first through hole 51, and the third protective plate 33 is provided with a third through hole 53 communicating with the second through hole 52. The fixing member 5 passes through the first through hole 51, the second through hole 52, and the third through hole 53 to fix the first protective plate 31, the second protective plate 32, and the third protective plate 33.

[0080] The battery pack provided above uses three layers of protection plates as the protection component 3 (which can be called the bottom protection plate) of the battery pack. While increasing the scratch and impact resistance of the battery pack, it can also make the protection component 3 lighter in weight and reduce costs. At the same time, in this application, a first buffer 34 is provided between the first protection plate 31 and the second protection plate 32, and a second buffer 35 is provided between the second protection plate 32 and the third protection plate 33. Moreover, the first buffer 34 and the second buffer 35 are alternately arranged in two directions, namely the length direction (the second direction X) and the width direction (the third direction Y) of the battery pack, so as to ensure that the bottom of the battery pack is covered by the buffers. When the battery pack is impacted by an external force, it can buffer the external force well. When thermal runaway occurs in the battery pack, the isolation member 4 can achieve the effects of insulation and fire prevention. The non-Newtonian fluid inside the buffer can absorb the heat generated by the single battery and delay the occurrence of thermal diffusion, thereby reducing risks such as fire or explosion.

[0081] An embodiment of this application also provides an electrical device, including the above-mentioned battery pack, and this battery pack serves as the power supply of the electrical device. The electrical device can be a mobile phone, a portable device, a laptop computer, a battery car, an electric vehicle, a ship, a spacecraft, an electric toy, an electric tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers, etc.

[0082] In the above embodiments, the descriptions of each embodiment have their own focuses. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0083] The above has introduced in detail a battery pack and an electrical device provided by an embodiment of this application. Specific examples are used in this article to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the technical solution and its core idea of this application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction, a second direction and a third direction intersecting in pairs, and comprises: A box body, provided with a cavity; A battery pack is disposed in the cavity; and a protection component, the protection component being arranged on one side of the battery pack in the first direction; Wherein, the protective assembly includes: a first protective plate, a second protective plate, a third protective plate, a first buffer member and a second buffer member, the first protective plate, the second protective plate and the third protective plate are stacked and connected along the first direction, a plurality of first buffer spaces are formed between the first protective plate and the second protective plate, the first buffer space accommodates the first buffer member, a plurality of second buffer spaces disconnected from the first buffer space are formed between the second protective plate and the third protective plate, the second buffer space accommodates the second buffer member.

2. The battery pack according to claim 1, characterized in that: Each of the first buffer spaces and each of the second buffer spaces are alternately distributed in the second direction and the third direction, and the first buffer components and each of the second buffer components are alternately distributed in the second direction and the third direction.

3. The battery pack according to claim 1 or 2, characterized in that: The second protective plate includes a convex structure and a concave structure, and the convex structure and the concave structure are alternately distributed in the second direction and the third direction; The first protective plate is disposed on one side of the recessed structure in the first direction, the first protective plate is connected to the recessed structure, and cooperates with the raised structure to enclose the first buffer space; The third protective plate is arranged on the other side of the second protective plate in the first direction, and the third protective plate cooperates with the recessed structure to enclose the second buffer space.

4. The battery pack according to claim 3, characterized in that: The third protective plate includes a plurality of first protective ribs and a plurality of second protective ribs, wherein the first protective ribs and the second protective ribs together enclose a first opening; The second buffer member includes a plurality of first buffer ribs and a plurality of second buffer ribs, and the first buffer ribs and the second buffer ribs are together enclosed to form a second opening; The second opening is connected to the first opening, an edge of the first opening overlaps the protruding structure, and the protruding structure is at least partially located in the first opening and the second opening.

5. The battery pack according to claim 3, characterized in that: The second protection plate comprises a flat plate portion, a boss portion and a connecting portion, wherein the flat plate portion and the boss portion are spaced apart in the first direction, the flat plate portion is disposed on the first protection plate, and the connecting portion is connected between the flat plate portion and the boss portion; the connecting portion is disposed at an angle to the flat plate portion and the boss portion respectively; The boss portion and the plurality of connecting portions cooperate to form the convex structure, and the flat plate portion and any two adjacent connecting portions cooperate to form the concave structure.

6. The battery pack according to claim 5, characterized in that: The boss portion includes a first step surface and a second step surface spaced apart from each other in the first direction, a portion of the third protective plate overlaps the first step surface, and the third protective plate is flush with the second step surface on a side away from the first protective plate.

7. The battery pack according to claim 1, characterized in that: The orthographic projection of the first buffer member on the first protective plate partially overlaps with the orthographic projection of the second buffer member on the first protective plate.

8. The battery pack according to claim 1, characterized in that: The first buffer and the second buffer respectively include an outer wrapping layer and a filler filled in the outer wrapping layer, wherein the material used for the filler includes a non-Newtonian fluid; or, The first buffer component includes an outer wrapping layer and a filler filled in the outer wrapping layer, and the filler and the second buffer component are both made of a non-Newtonian fluid.

9. The battery pack according to claim 1, characterized in that: The box body includes a plurality of side panels, the first protective plate is connected to one end of the side panel in a first direction, and the first protective plate cooperates with the plurality of side panels to enclose the cavity.

10. The battery pack according to claim 1, characterized in that: Also includes: The isolating member is arranged on a side of the third protective plate away from the first protective plate.

11. An electrical device, characterized in that: It comprises the battery pack according to any one of claims 1 to 10, and the battery pack serves as a power supply for the electrical device.

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