Battery box body, battery device and electric equipment

Abstract

The embodiment of the utility model discloses a battery box body, a battery device and electric equipment, and relates to the field of batteries. The battery box body comprises a frame, a mounting part and an energy absorption groove, the frame forms a hollow structure with an accommodating space, the hollow structure accommodates a battery monomer, the frame comprises an edge beam, and the edge beam comprises a first wall far away from the hollow structure; the mounting part is located on the side, away from the hollow structure, of the edge beam, is fixedly connected with the edge beam and comprises a second wall, and the second wall and the first wall are oppositely arranged; the energy absorption groove is located between the first wall and the second wall and penetrates through the first wall in the first direction. Wherein the first direction is a direction perpendicular to the top or the bottom of the battery box body. And the energy absorption grooves can reduce the deformation and even damage of the battery monomers when the mounting part is impacted, so that the safety performance of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, and more particularly, to a battery box, a battery device and an electric equipment. BACKGROUND

[0002] The battery box plays a protective role in guaranteeing the safety of the battery monomer. When the battery device is subjected to an impact, the battery box is deformed under stress, and then the battery monomer is easily subjected to a large load impact, resulting in deformation or even damage of the battery monomer, thereby causing a safety hazard. SUMMARY

[0003] The battery box, the battery device and the electric equipment provided by the embodiments of the present application can reduce the impact on the battery monomer during a collision and improve the safety performance of the battery device.

[0004] In a first aspect, the present application provides a battery box, comprising: a frame forming a hollow structure with a containing space, the hollow structure containing a battery monomer, the frame comprising a side beam, the side beam comprising a first wall away from the hollow structure; a mounting portion located on a side of the side beam away from the hollow structure, the mounting portion being fixedly connected with the side beam, the mounting portion comprising a second wall, the second wall being oppositely arranged with the first wall; an energy absorption groove located between the first wall and the second wall, the energy absorption groove penetrating in a first direction; wherein the first direction is a direction perpendicular to a top or a bottom of the battery box.

[0005] In the technical solution of the embodiments of the present application, the energy absorption groove is arranged between the side beam and the mounting portion of the battery box. When the mounting portion is subjected to an impact, the energy is first transmitted to the energy absorption groove, and the energy absorption groove converts most of the energy into its own deformation energy through collapse deformation, thereby reducing the energy transmitted to the side beam and the inside of the battery box. The energy absorption groove penetrates in a direction perpendicular to the top or the bottom of the battery box, so that the energy absorption groove forms a continuous structure in the vertical direction. When the mounting portion is subjected to an impact, the energy absorption groove can play an energy absorption role in a larger range. The energy absorption groove can reduce the deformation or even damage of the battery monomer when the mounting portion is subjected to an impact, thereby improving the safety performance of the battery device.

[0006] In some embodiments of the first aspect, the energy absorption groove extends in a second direction, so that the energy absorption groove collapses and deforms when the battery box is subjected to a collision, causing the first wall to be attached to the second wall, wherein the second direction is parallel to the extension direction of the side beam and perpendicular to the first direction.

[0007] In the embodiments of the present application, the extension direction of the energy absorption groove is the same as the extension direction of the edge beam, the energy absorption groove is more prone to collapse, so that the second wall of the mounting portion and the first wall of the beam body can be attached in the form of a surface, and as such attachment occurs, the edge beam will also be attached to the battery monomer in the hollow structure in the form of a surface, which can reduce the load impact on the local battery monomer, causing local deformation or even damage to the battery monomer.

[0008] In some embodiments of the first aspect, the battery box body comprises a transition structure arranged between the edge beam and the mounting portion, the transition structure is fixedly connected with the edge beam and the mounting portion respectively, wherein the energy absorption groove is arranged in the transition structure, and the energy absorption groove penetrates through the transition structure along the first direction.

[0009] In the embodiments of the present application, by adding a transition structure between the edge beam and the mounting portion, the connection strength between the edge beam and the mounting portion can be increased, and the transition structure also plays a role in force transmission. The transition structure also provides support and fixation for the energy absorption groove.

[0010] In some embodiments of the first aspect, the center line of the energy absorption groove along the second direction coincides with the center line of the transition structure along the second direction.

[0011] In the embodiments of the present application, the energy absorption groove is located at the center of the transition structure, and the energy absorption groove can make the impact force transmitted from the mounting portion to the edge beam along the most symmetrical path through the transition structure, without local excessive deformation or stress concentration phenomenon due to uneven force distribution, reducing the possibility of damage of each structure at a certain point.

[0012] In some embodiments of the first aspect, the minimum distance between the energy absorption groove and the transition structure along the third direction is greater than or equal to 0.5mm, wherein the third direction is perpendicular to the first direction and perpendicular to the second direction.

[0013] In the embodiments of the present application, the energy absorption groove and the transition structure have a certain distance, which can reduce the damage to the structure of the energy absorption groove during processing and affect the energy absorption effect.

[0014] In some embodiments of the first aspect, the mounting portion comprises a mounting hole, the mounting hole is located on the side of the second wall facing the first wall, and the energy absorption groove is located in the intermediate region between the mounting hole and the first wall.

[0015] In the embodiments of the present application, the mounting hole is arranged between the first wall and the second wall, which can reduce the possibility of direct impact of energy on the first wall and the battery monomer and other components inside the battery box body when impacted. The energy absorption groove is arranged between the mounting hole and the first wall, and the collapse and deformation of the energy absorption groove can absorb the energy transmitted by the mounting hole, playing a role in buffering and dispersing the impact force.

[0016] In some embodiments of the first aspect, the distance between the center line of the energy absorption groove along the second direction and the first wall is H1, the minimum distance between the mounting hole and the first wall is H2, and the ratio of H1 to H2 is 1:2.

[0017] In the embodiments of the present application, the energy absorption groove is located at the center position of the mounting hole and the first wall. When the energy generated by the collision is transmitted from the mounting hole to the first wall, the energy absorption groove can balance the stress distribution in the force transmission path. The center position of the energy absorption groove can effectively reduce the stress concentration phenomenon.

[0018] In some embodiments of the first aspect, the mounting portion includes at least two mounting holes, and the center line of the energy absorption groove along the third direction coincides with the center line of the adjacent two mounting holes along the third direction.

[0019] In the embodiments of the present application, along the third direction, the energy absorption groove is located in the middle region of the adjacent two mounting holes. The mounting hole can provide a certain structural support for the mounting portion. The middle region of the adjacent two mounting holes is a weak region of the structural strength of the mounting portion, which is prone to local deformation and damage when the battery box is subjected to external force. Therefore, the energy absorption groove is arranged in the middle region of the adjacent two mounting holes to reduce the impact of the collision on the weak region of the mounting portion.

[0020] In some embodiments of the first aspect, the hollow structure includes a first hollow structure, the center line of the first hollow structure along the third direction coincides with the center line of the hollow structure along the third direction, the center line of the energy absorption groove along the third direction coincides with the center line of the first hollow structure along the third direction, the third direction is perpendicular to the first direction, and the third direction is perpendicular to the second direction.

[0021] In the embodiments of the present application, when the hollow structure includes an odd number of sub hollow structures, the first hollow structure is located at a weak position in the center of the hollow structure. The energy absorption groove is arranged at the weakest position in the center of the first hollow structure to reduce the impact of the collision on the battery monomer in the center of the first hollow structure.

[0022] In some embodiments of the first aspect, the hollow structure includes two adjacent second hollow structures, the center line of the two second hollow structures along the third direction coincides with the center line of the hollow structure along the third direction, and the center line of the energy absorption groove along the third direction coincides with the center line of the second hollow structure along the third direction. The third direction is perpendicular to the first direction, and the third direction is perpendicular to the second direction.

[0023] In the embodiments of the present application, when the hollow structure includes an even number of sub hollow structures, the two second hollow structures are located at a weak position in the center of the hollow structure. The energy absorption groove is arranged at the weakest position in the center of the two second hollow structures to reduce the impact of the collision on the battery monomer in the center of the second hollow structure.

[0024] In some embodiments of the first aspect, the number of the energy absorption grooves is multiple, and the multiple energy absorption grooves are distributed on both sides of the hollow structure along the second direction.

[0025] In the embodiments of the present application, by arranging the energy absorption grooves on both sides of the hollow structure, when an impact occurs, the impact force can be evenly dispersed on both sides during transmission, which can reduce the situation that the force is concentrated on one side or one area, so that the battery box can maintain better balance and stability when subjected to impact.

[0026] In some embodiments of the first aspect, the number of the energy absorption grooves is greater than or equal to 2 and less than or equal to 4.

[0027] In the embodiments of the present application, when the hollow structure includes an odd number of sub-hollow structures, the number of energy absorption grooves is 2 and is distributed on both sides of the first hollow structure along the second direction, and when the hollow structure includes an even number of sub-hollow structures, the number of energy absorption grooves is 4 and is distributed on both sides of the two second hollow structures along the second direction.

[0028] In some embodiments of the first aspect, the inner wall of the energy absorption groove includes a first rounded corner and a second rounded corner, the first rounded corner is close to the first wall, and the second rounded corner is close to the second wall, and the radius of the first rounded corner is less than or equal to the radius of the second rounded corner.

[0029] In the embodiments of the present application, the inner wall of the energy absorption groove is provided with a first rounded corner and a second rounded corner, and the first rounded corner collapses and deforms first when subjected to impact due to the smaller radius, thereby absorbing part of the energy generated by the impact, making the second wall more stable during the process of approaching the first wall, and reducing irregular deformation caused by sudden impact.

[0030] In some embodiments of the first aspect, the inner wall of the energy absorption groove includes a first inner wall and a second inner wall, the first inner wall is close to the first wall, the first inner wall is perpendicular to the second inner wall, and there is a gap between the first inner wall and the second inner wall.

[0031] In the embodiments of the present application, by arranging a gap between the first inner wall and the second inner wall of the energy absorption groove, the gap is close to the first wall, which destroys the continuity of the inner wall of the energy absorption groove, so that stress is more easily concentrated near the gap when subjected to external force, thereby making the gap more easily collapse and deform. In turn, the second wall is more stable during the process of approaching the first wall, and irregular deformation caused by sudden impact is reduced.

[0032] In some embodiments of the first aspect, the size of the energy absorption groove along the second direction is L, the hollow structure includes at least one third hollow structure, the size of the third hollow structure along the second direction is L1, and the ratio of L to L1 is less than or equal to 1 / 3.

[0033] In the embodiment of the present application, the energy absorption groove and the third hollow have a certain proportional relationship in size, so that in the process of force transmission, the energy absorption groove can effectively disperse the impact force without occupying too much space, while meeting the connection strength of the side beam and the mounting portion and the structural strength of the mounting portion.

[0034] In some embodiments of the first aspect, the energy absorption groove has a size W along a third direction, the transition structure has a size W1 along the third direction, a ratio of W to W1 is greater than or equal to 0.5 and less than or equal to 0.8, wherein the third direction is perpendicular to the first direction and perpendicular to the second direction.

[0035] In the embodiment of the present application, the energy absorption groove and the transition structure have a certain proportional relationship in size, when the ratio of W to W1 is within a given range, the energy absorption groove and the transition structure can realize good cooperation in the process of force transmission. The appropriate size ratio makes the energy absorption groove and the transition structure effectively cooperate when force is transmitted between them.

[0036] In a second aspect, the present application provides a battery device, comprising: a plurality of battery monomers; and a battery box body comprising the battery box body in the first aspect or any one of the embodiments of the first aspect, wherein the plurality of battery monomers are accommodated in the battery box body.

[0037] In a third aspect, the present application provides a power consuming device, comprising: a battery device comprising the battery device in the second aspect, wherein the battery device is used to provide electric energy.

[0038] In some embodiments, the power consuming device is a vehicle, a ship or a spacecraft. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 Structure schematic diagram of a vehicle according to an embodiment of the present application;

[0040] Figure 2 Structure schematic diagram of a battery device according to an embodiment of the present application;

[0041] Figure 3 Structure diagram of a battery monomer according to an embodiment of the present application;

[0042] Figure 4 Exploded view of a battery monomer according to an embodiment of the present application;

[0043] Figure 5 Structure diagram of a battery box body according to an embodiment of the present application;

[0044] Figure 6 Sectional view of a battery box body according to an embodiment of the present application;

[0045] Figure 7Another sectional view of the battery case according to an embodiment of the present application;

[0046] Figure 8 A partial structural view of the battery case according to an embodiment of the present application;

[0047] Figure 9 Another partial structural view of the battery case according to an embodiment of the present application;

[0048] Figure 10 Another partial structural view of the battery case according to an embodiment of the present application;

[0049] Figure 11 Another structural view of the battery case according to an embodiment of the present application;

[0050] Figure 12 Another structural view of the battery case according to an embodiment of the present application;

[0051] Figure 13 Another partial structural view of the battery case according to an embodiment of the present application;

[0052] Figure 14 Another partial structural view of the battery case according to an embodiment of the present application;

[0053] Figure 15 Another partial structural view of the battery case according to an embodiment of the present application.

[0054] In the drawings, the drawings are not drawn according to the actual scale.

[0055] Reference signs:

[0056] 1000 - vehicle; 100 - battery device; 10 - battery case; 101 - first case portion; 102 - second case portion; 11 - frame; 110 - beam; 111 - first wall; 12 - mounting portion; 121 - second wall; 122 - mounting hole; 13 - energy absorption groove; 131 - first fillet; 132 - second fillet; 133 - first inner wall; 134 - second inner wall; 14 - hollow structure; 141 - first hollow structure; 142 - second hollow structure; 143 - third hollow structure; 15 - transition structure; 20 - battery cell; 21 - housing; 211 - opening; 22 - end cover; 23 - electrode terminal; 24 - pressure relief mechanism; 25 - electrode assembly; 251 - tab; 200 - motor; 300 - controller. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0058] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the description of the present application and the claims and the above description of drawings are intended to cover the non-exclusive inclusion. The terms "first", "second" and the like in the description of the present application and the claims or the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0060] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0061] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0063] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0064] In the present application, "a plurality of" refers to more than two (including two), and similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0065] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0066] Unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0067] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to use.

[0068] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0069] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator arranged between the positive electrode and the negative electrode can reduce the occurrence of positive and negative short circuits, and at the same time allow the active ions to pass through.

[0070] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0071] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0072] As an example, the positive electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be employed. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to as NCM 811at least one of lithium nickel cobalt manganese oxide (e.g., LiNi0.8Co0.15Al0.05O2), lithium nickel cobalt aluminum oxide (e.g., LiNi0.8Co0.15Al0.05O2), and modified compounds thereof. The modified compounds refer to compounds obtained by modifying the above-mentioned substances through doping or coating, etc.

[0074] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as the positive electrode, the foamed metal surface can not be provided with the positive electrode active material, or of course can be provided with the positive electrode active material. As an example, the positive electrode active material is filled or / and deposited in the foamed metal.

[0075] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0076] As an example, the negative electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (e.g., a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0078] As an example, the negative electrode current collector has two opposite surfaces in the thickness direction thereof, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0079] As an example, the negative electrode active material can employ a negative electrode active material known in the art for a battery cell. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0080] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as the negative electrode sheet, the foamed metal surface can be free of the negative electrode active material, or can be provided with the negative electrode active material.

[0081] As an example, the negative electrode active material can be filled or / and deposited in the negative electrode current collector.

[0082] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0083] In some embodiments, the electrode assembly further comprises a separator disposed between the positive electrode and the negative electrode.

[0084] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited in the present application, and any known porous structure separator film with good chemical stability and mechanical stability can be used.

[0085] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive electrode and the negative electrode, or can be attached to the surface of the positive electrode and the negative electrode. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can be applied to the surface of the separator film.

[0086] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions as an ion transport and a separator for the positive electrode and the negative electrode.

[0087] In some embodiments, the battery cell further comprises an electrolyte, which functions as an ion conductor between the positive electrode and the negative electrode. The type of the electrolyte is not particularly limited in the present application, and can be selected according to the requirements. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0088] The liquid electrolyte includes an electrolyte salt and a solvent.

[0089] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluorophosphoric oxalate, and lithium tetrafluorophosphoric oxalate.

[0090] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and a crown ether.

[0091] In some embodiments, the electrolyte solution can further include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, and an additive capable of improving certain performance of the battery cell, such as an additive capable of improving overcharge / rapid charge performance of the battery cell, an additive capable of improving high-temperature performance of the battery cell, an additive capable of improving low-temperature performance of the battery cell, and the like.

[0092] In some embodiments, the gel-type electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0093] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0094] As an example, the polymer of the polymer solid-state electrolyte can include a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0095] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium phosphorous sulfide, sulfur silver phosphorus), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0096] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0097] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of a wound structure and a stacked structure.

[0098] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0099] In some embodiments, the electrode assembly is a laminated structure.

[0100] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately laminated.

[0101] As an example, a plurality of positive electrode sheets are provided, and the negative electrode sheet is folded to form a plurality of folded segments laminated.

[0102] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately laminated.

[0103] As an example, a plurality of separators are provided and arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0104] As an example, a plurality of separators are provided and arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0105] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0106] In some embodiments, the electrode assembly is provided with a tab, which can guide the current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0107] In some embodiments, the battery cell can include a shell. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the shell can be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell serves to protect the electrode assembly, and the shell and the electrode assembly further include a sealing bag for packaging the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to package the electrode assembly and the electrolyte, etc.

[0108] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, such as a hexagonal prismatic battery cell, etc., without specific limitation in the present application.

[0109] In some embodiments, the shell includes an end cap and a shell body, the shell body is provided with an opening, and the end cap is arranged at the opening. The shell body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0110] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or indirectly connected to the tab through a current collecting member. The electrode terminal can be provided on the end cap or on the housing.

[0111] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0112] As an example, the pressure relief mechanism is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to the design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell.

[0113] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0114] As an example, the pressure relief mechanism can also be provided separately from the housing and connected to the housing.

[0115] The term "actuated" as mentioned in the present application refers to the pressure relief mechanism generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action generated by the pressure relief mechanism can include but is not limited to: a component in the pressure relief mechanism moving to form an exhaust passage, at least a part of the pressure relief mechanism breaking, shattering, being torn or opening, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as exhaust. In this way, the battery cell can be relieved of pressure and temperature in a controllable manner, thereby reducing the possibility of a more serious accident.

[0116] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be provided as a through hole for discharging the gas inside the battery cell.

[0117] The term "exhaust" from the battery cell as mentioned in the present application includes but is not limited to: electrolyte, dissolved or split positive and negative plates, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flame, etc.

[0118] The battery apparatus as mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a current collecting member.

[0119] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells.

[0120] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0121] In some embodiments, the battery device can be a battery pack, which includes a battery case and one or more battery cell assemblies, the battery cell assemblies are accommodated in the battery case.

[0122] As an example, the battery cell assembly can be a battery module, which can be accommodated in the battery case by fixing the battery module in the battery case.

[0123] As an example, the battery cell assembly can also be accommodated in the battery case by fixing a plurality of battery cells directly in the battery case.

[0124] As an example, the battery case can include a first battery case portion and a second battery case portion. The first battery case portion and the second battery case portion are fastened so that a closed space is formed inside the battery case to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first battery case portion can be a top cover or a bottom plate.

[0125] As an example, the battery case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that a closed space is formed inside the battery case to accommodate the battery cell assembly.

[0126] In some embodiments, the battery case can be part of the chassis structure of the vehicle. For example, part of the battery case can be at least part of the floor of the vehicle, or part of the battery case can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0127] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of hydroelectric, thermal, wind and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0128] The battery box body plays a protective role in protecting the safety of the battery monomer. When the battery box body protection structure and process are relatively complex, it will bring inconvenience to the installation process of the battery device to a certain extent. In addition, when the battery device is subjected to impact, the battery box body is deformed under stress, and then the battery monomer is easily deformed or even damaged due to local excessive pressure.

[0129] Based on the above considerations, the embodiments of the present application provide a battery box body which can solve the problem that the battery monomer in the battery box body is easily deformed or even damaged due to local excessive pressure. The battery box body provided by the embodiments of the present application includes a frame, a mounting portion and an energy absorption groove. The frame forms a hollow structure with a containing space, the hollow structure contains the battery monomer, the frame includes a side beam, and the side beam includes a first wall away from the hollow structure; the mounting portion is located on the side of the side beam away from the hollow structure, the mounting portion is fixedly connected with the side beam, the mounting portion includes a second wall, and the second wall is arranged opposite to the first wall; the energy absorption groove is located between the first wall and the second wall and penetrates in a first direction; wherein the first direction is a direction perpendicular to the top or bottom of the battery box body.

[0130] In such a battery box body, since the energy absorption groove is arranged between the side beam and the mounting portion of the battery box body, when the mounting portion is subjected to impact, the energy is first transmitted to the energy absorption groove, and the energy absorption groove converts most of the energy into its own deformation energy through collapse deformation, thereby reducing the energy transmitted to the side beam and the inside of the battery box body. The energy absorption groove penetrates in a direction perpendicular to the top or bottom of the battery box body, so that the energy absorption groove forms a continuous structure in the vertical direction, and when the mounting portion is subjected to impact, the energy absorption groove can play an energy absorption role in a larger range. The energy absorption groove can reduce the deformation or even damage of the battery monomer when the mounting portion is subjected to impact, and improve the safety performance of the battery device.

[0131] The technical solutions described in the embodiments of the present application are applicable to various electric equipment using battery devices. The electric equipment can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric automobile toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not specially limit the above electric equipment.

[0132] The following embodiments take the vehicle as an example for convenience of description.

[0133] For example, Figure 1 A structural schematic diagram of a vehicle according to an embodiment of the present application. As shown in Figure 1 The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 can be provided with a battery device 100, a motor 200, and a controller 300, and the controller 300 is used to control the battery device 100 to supply power to the motor 200. For example, the battery device 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, and can be used for the circuit system of the vehicle 1000, for example, for the power demand of the vehicle 1000 during starting, navigation, and operation. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving force for the vehicle 1000.

[0134] Figure 2 A structural schematic diagram of a battery device according to an embodiment of the present application. As shown in Figure 2 The battery device 100 according to an embodiment of the present application can include a plurality of battery monomers 20 to meet different power requirements. It should be understood that, as shown in Figure 2 The battery device 100 according to an embodiment of the present application can also include a battery box 10.

[0135] The battery box 10 can include two parts, which are referred to as a first box part 101 and a second box part 102, respectively, and the first box part 101 and the second box part 102 are buckled together. The shapes of the first box part 101 and the second box part 102 can be determined according to the shapes of the components contained therein, for example, according to the shape of the combination of the plurality of battery monomers 20 contained therein, and at least one of the first box part 101 and the second box part 102 has an opening. For example, the first box part 101 and the second box part 102 can each be a hollow cuboid and each have an opening face, the opening of the first box part 101 and the opening of the second box part 102 are oppositely arranged, and the first box part 101 and the second box part 102 are buckled to form a battery box 10 with a hollow structure, which can be used to accommodate the plurality of battery monomers 20. The plurality of battery monomers 20 are arranged in parallel or in series or in a hybrid combination after being placed in the battery box 10 formed by buckling the first box part 101 and the second box part 102.

[0136] For another example, only one of the first case portion 101 and the second case portion 102 can be a hollow cuboid with an opening, and the other can be a plate-shaped structure to cover the opening. For example, the second case portion 102 is a hollow cuboid with an opening, and the first case portion 101 is a plate-shaped structure. The first case portion 101 covers the opening of the second case portion 102 to form a battery case 10 with a hollow structure, which can be used to accommodate a plurality of battery monomers 20.

[0137] Figure 3 A structural diagram of a battery monomer according to an embodiment of the present application, Figure 4 An exploded view of a battery monomer according to an embodiment of the present application. As shown in Figure 3 、 Figure 4 The battery monomer 20 according to the embodiment of the present application can include a shell 21, an end cover 22, an electrode terminal 23, a pressure relief mechanism 24, and an electrode assembly 25.

[0138] The shell 21 is a hollow structure with an opening 211, and the electrode assembly 25 is accommodated in the shell 21. The shape of the shell 21 can be determined according to the specific shape of the electrode assembly 25. For example, if the electrode assembly 25 is a cuboid structure, the shell 21 can also be a cuboid structure. Figure 3 and Figure 4 An example is shown in which the shell 21 and the electrode assembly 25 are square.

[0139] The material of the shell 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. The embodiment of the present application does not limit this.

[0140] The end cover 22 is used to cover the opening 211 to form a sealed mounting space for accommodating the electrode assembly 25. The mounting space is also used to accommodate electrolyte, such as electrolyte solution. The electrode terminal 23 is mounted on the end cover 22 and is used to connect with the electrode assembly 25, i.e. the electrode terminal 23 is connected with the tab 251 of the electrode assembly 25.

[0141] The pressure relief mechanism 24 is also mounted on the end cover 22. When the internal pressure of the battery monomer 20 abnormally rises, the pressure relief mechanism 24 can be started in time to release the excessive internal pressure of the battery monomer 20, thereby reducing the possibility of explosion and other dangerous situations of the battery monomer 20.

[0142] It should be understood that the shape of the battery monomer 20 according to the embodiment of the present application can be flexibly set according to actual application, i.e. the shell 21 of the battery monomer 20 can be any polyhedral structure, for example, it can be set as a cuboid or a cylinder, etc.

[0143] Figure 5 A structural diagram of a battery case according to an embodiment of the present application. As shown in Figure 5As shown, the battery box 10 can include a frame 11, a mounting portion 12 and an energy absorption groove 13. The frame 11 forms a hollow structure 14 having a receiving space, which can accommodate the battery monomer 20. The frame 11 can include a side beam 110, which can include a first wall 111 away from the hollow structure 14. The mounting portion 12 is located on the side of the side beam 110 away from the hollow structure 14, and is fixedly connected with the side beam 110. The mounting portion 12 can include a second wall 121, which is arranged opposite to the first wall 111. The energy absorption groove 13 is located between the first wall 111 and the second wall 121, and penetrates in the first direction. The first direction is perpendicular to the top or bottom of the battery box 10.

[0144] It should be understood that the battery box 10 of the embodiment of the present application can be used to accommodate a plurality of battery monomers 20.

[0145] In the embodiment of the present application, the frame 11 can include a plurality of side beams 110, for example, the side beams 110 are connected end to end to jointly form the hollow structure 14. For another example, the frame 11 can include two oppositely arranged side beams 110, which are respectively connected with the mounting portion 12 for connecting external equipment.

[0146] In the embodiment of the present application, the side beam 110 can include the first wall 111 away from the hollow structure 14, that is, the first wall 111 can be located on the side of the side beam 110 facing outward, and the first wall 111 does not directly contact the hollow structure 14 inside.

[0147] The material of the battery box 10 of the embodiment of the present application can include one or more, for example, it can include high-strength metal materials such as aluminum alloy, steel and the like, to provide good structural strength and stability, and to ensure the safety of the battery in various environments; it can also include non-metallic materials with excellent insulation performance, such as engineering plastics and the like, which can reduce the possibility of safety hazards such as battery leakage; it can also include materials with good heat conduction performance to facilitate heat dissipation during battery operation and maintain the normal operating temperature of the battery.

[0148] In the embodiment of the present application, the mounting portion 12 can realize the connection between the battery box 10 and external equipment, for example, the mounting portion 12 can be connected with the chassis of the electric vehicle through a connecting structure to provide stable power supply for the electric vehicle and enable the normal operation of the vehicle. The mounting portion 12 and the side beam 110 jointly bear external loads.

[0149] It should be understood that the mounting portion 12 of the embodiment of the present application is located on the side of the side beam 110 away from the hollow structure 14, that is, the side beam 110 is located between the hollow structure 14 and the mounting portion 12, for example, as shown in Figure 5As shown, the side beam 110 is the mounting portion 12 on the side of the hollow structure, that is, along the Y direction, and the position sequence of the above structure is hollow structure 14, side beam 110 and mounting portion 12 in turn.

[0150] In the embodiment of the present application, the mounting portion 12 and the side beam 110 can be fixedly connected, for example, by using welding, bolt connection or riveting connection process to fix the mounting portion 12 on the side beam 110.

[0151] In the embodiment of the present application, the structure strength of the side beam 110 and the mounting portion 12 meets the requirements, and the layout mode of the energy absorption groove 13 is not limited. The energy absorption groove 13 can disperse and absorb external impact energy and reduce the influence on the battery monomer 20 in the hollow structure 14.

[0152] In the embodiment of the present application, the energy absorption groove 13 can be located between the first wall 111 and the second wall 121. When the mounting portion 12 is impacted, the second wall 121 is deformed by the impact, and the energy is transmitted from the second wall 121 to the energy absorption groove 13. The energy absorption groove 13 converts most of the energy into its own deformation energy through collapse deformation, thereby reducing the energy transmitted to the second wall 121 and the inside of the battery box 10. The load on the battery monomer 20 is reduced, the impact of the impact on the battery monomer 20 is reduced, and the deformation of the battery monomer 20 is reduced.

[0153] In the embodiment of the present application, the energy absorption groove 13 is directly processed on the battery box 10, without the need for additional complex molds or special equipment. Compared with using pre-made energy absorption components for assembly, the direct processing method greatly reduces the demand for special processing equipment and tools, reduces the production links and processes. In addition, the energy absorption groove 13 has a simple structure and no complex internal structure or connection part, thereby reducing the risk of failure caused by structural complexity.

[0154] In addition, in order to facilitate description, three reference directions are defined based on the battery box 10 in the embodiment of the present application. The direction perpendicular to the top or bottom of the battery box 10 is the Z direction, that is, the first direction, wherein the top refers to the top cover of the battery box 10, that is, the uppermost plate surface of the battery box 10 in the use state of the battery device 100, and the bottom refers to the bottom plate of the battery box 10, that is, the lowermost plate surface of the battery box 10 in the use state of the battery device 100. The direction parallel to the extension direction of the side beam 110 of the battery box 10 is the X direction, that is, the second direction; the direction perpendicular to the X direction and perpendicular to the Z direction is the Y direction, that is, the third direction, wherein the X direction, the Y direction and the Z direction are perpendicular to each other.

[0155] In the embodiment of the present application, the energy absorption groove 13 can penetrate along the Y direction, so that the energy absorption groove 13 forms a continuous structure in the Y direction, and can play an energy absorption role in a larger range when the mounting portion 12 is impacted.

[0156] In the embodiment of the present application, the energy absorption groove 13 can extend along the second direction, so that the energy absorption groove 13 collapses and deforms when the battery box 10 is subjected to a collision, causing the first wall 111 to abut against the second wall 121.

[0157] It should be understood that the cross section of the energy absorption groove 13 in the Z direction can be an elongated shape extending along the X direction.

[0158] In the embodiment of the present application, the extension direction of the energy absorption groove is the same as the extension direction of the side beam, and the energy absorption groove is more likely to collapse. When the battery box 10 is subjected to a collision, the energy absorption groove 13 begins to play its role of buffering and protection. When the mounting portion 12 of the battery box 10 is subjected to a collision, the impact force generated by the collision first acts on the second wall 121. Since the energy absorption groove 13 extends along the second direction and is located between the first wall 111 and the second wall 121, the area where the energy absorption groove 13 is located will quickly feel the action of the external force. At this stage, the part of the energy absorption groove 13 close to the collision point begins to bear pressure, and the material of the inner wall of the energy absorption groove 13 generates stress due to the extrusion of the external force. With the continuous action of the impact force, the inner wall of the energy absorption groove 13 begins to deform locally. The stress concentration degree of the chamfer of the energy absorption groove 13 is relatively high, so it first begins to show obvious signs of deformation, and this deformation gradually spreads to the surrounding. At the same time, the inner wall of the energy absorption groove 13 also begins to bend and deform under pressure, and the inner wall close to the second wall 121 bends and deforms inwardly in the energy absorption groove 13, causing the width of the energy absorption groove 13 in the local area along the Y direction to gradually decrease. The space inside the energy absorption groove 13 is gradually compressed, and the collision energy absorbed by the energy absorption groove 13 also gradually increases. Since the first wall 111 and the second wall 121 are oppositely arranged, as the energy absorption groove 13 continuously collapses, the distance between them gradually decreases. After the energy absorption groove 13 continuously collapses to a certain extent, the first wall 111 and the second wall 121 begin to approach each other and eventually abut against each other. At this time, the energy absorption groove 13 has basically completed its main collapse deformation process, and has absorbed a large amount of collision energy through its deformation, thereby effectively reducing the impact force transmitted to the battery monomer 20 inside the battery box 10.

[0159] The energy absorption groove 13 can be directly arranged between the first wall 111 of the side beam 110 and the second wall 121 of the mounting portion 12, or a transition structure 15 can be additionally arranged between the side beam 110 and the mounting portion 12, and the energy absorption groove 13 can be arranged on the transition structure 15. The following will be introduced respectively in combination with Figure 6 and Figure 7 .

[0160] Figure 6 A cross-sectional view of the battery box of an embodiment of the present application. As shown in Figure 6As shown, the battery box 10 can further include a transition structure 15 disposed between the edge beam 110 and the mounting portion 12, and the transition structure 15 is fixedly connected with the edge beam 110 and the mounting portion 12 respectively, wherein the energy absorption groove 13 is disposed on the transition structure 15, and the energy absorption groove 13 penetrates through the transition structure 15 along the first direction.

[0161] In the embodiment of the present application, the transition structure 15 is fixedly connected with the edge beam 110 and the mounting portion 12 respectively. This connection mode can adopt various forms, such as welding, bolt connection or riveting, etc.

[0162] In the embodiment of the present application, the transition structure 15 is disposed between the edge beam 110 and the mounting portion 12, so that the structure of the whole battery box 10 is more coherent and stable, and the overall stability of the battery box 10 is maintained. In addition, the transition structure 15 also plays a role of force transmission and dispersion, when the battery box 10 is subjected to external force, the force can be more evenly transmitted between the edge beam 110 and the mounting portion 12 through the transition structure 15, which can alleviate the stress concentration problem and improve the overall mechanical properties of the battery box.

[0163] In the embodiment of the present application, the energy absorption groove 13 is disposed on the transition structure 15, and the transition structure 15 becomes the basic carrier for the energy absorption groove 13 to play a role. The energy absorption groove 13 absorbs energy by collapsing deformation when the battery box 10 is subjected to collision, and the transition structure 15 provides support and fixation for the energy absorption groove 13. When no collision occurs, the transition structure 15 maintains the stable structure of the energy absorption groove 13, so that it will not be deformed due to vibration or other slight external force interference during the normal operation of the battery box 10.

[0164] In the embodiment of the present application, the center line of the energy absorption groove 13 along the second direction coincides with the center line of the transition structure 15 along the second direction.

[0165] It should be understood that, in the section along the Y direction, the energy absorption groove 13 can be located at the center of the transition structure 15, when the battery box is subjected to collision, the impact force will be transmitted from the second wall 121 to the transition structure 15, and then to the first wall 111, and the energy absorption groove 13 located at the center of the transition structure 15 can make the force transmitted from the mounting portion 12 to the edge beam 110 through the transition structure 15 along the most symmetrical path, without the phenomenon of local excessive deformation or stress concentration due to uneven distribution of force, reducing the possibility of damage of each structure at a certain point.

[0166] It should be understood that, the energy absorption groove 13 is located at the center of the transition structure 15, so that the transition structure 15 can provide more stable support when connecting the edge beam 110 and the mounting portion 12. The center of gravity of the transition structure 15 coincides with the center of the energy absorption groove 13, thereby forming a kind of balanced state in mechanics.

[0167] In the embodiments of the present application, the minimum distance between the energy absorption groove 13 and the transition structure 15 in the third direction is greater than or equal to 0.5 mm.

[0168] It should be understood that the energy absorption groove 13 and the transition structure 15 can have a certain distance, so that when processing, the energy absorption groove 13 will not deviate from its position due to the small distance between the energy absorption groove 13 and the transition structure 15. For example, the energy absorption groove 13 is processed on the first wall 111.

[0169] It should be understood that the distance between the energy absorption groove 13 and the transition structure 15 in the Y direction can be 0.5 mm, 1 mm, 1.5 mm, or 2 mm.

[0170] The main function of the energy absorption groove 13 is to absorb energy when subjected to external force impact, while the transition structure 15 serves to connect and transmit force. If the distance between the energy absorption groove 13 and the transition structure 15 is too small, it may cause the structure of the energy absorption groove 13 to be damaged during processing, affecting its energy absorption effect.

[0171] Figure 7 Another cross-sectional view of the battery box of an embodiment of the present application. As shown in Figure 7 The mounting portion 12 can include a mounting hole 122, which can be located on the side of the second wall 121 facing the first wall 111, and the energy absorption groove 13 can be located in the intermediate region between the mounting hole 122 and the first wall 111.

[0172] It should be understood that the mounting hole 122 is an interface for the connection of the mounting portion 12 and external equipment. For example, in an electric vehicle, the mounting hole 122 of the battery box can be used for bolt connection with the chassis or components of the power system.

[0173] It should be understood that the mounting hole 122 is located on the side of the second wall 121 facing the first wall 111, i.e. the mounting hole 122 is located between the first wall 111 and the second wall 121, and the energy absorption groove 13 is located in the intermediate region between the mounting hole 122 and the first wall 111, i.e. in the Y direction, the position sequence of each structure is in turn the first wall 111, the energy absorption groove 13, the mounting hole 122, and the second wall 121.

[0174] In this embodiment, a mounting hole 122 is provided between the first wall 111 and the second wall 121, which can reduce the direct impact of energy on the first wall 111 and components such as the battery cells 20 inside the battery box 10 during an impact. An energy-absorbing groove 13 is located between the mounting hole 122 and the first wall 111. When the battery box 10 encounters a collision, the external force first acts on the mounting hole 122, which is connected to external equipment. During the transfer of energy from the mounting hole 122 to the inside of the battery box 10, the energy-absorbing groove 13 absorbs and disperses the energy through its own collapse deformation, mitigating the problem of direct energy impact on the first wall 111 and components such as the battery cells 20 inside the battery box 10, thereby protecting the structural integrity of the entire battery box 10.

[0175] It should be understood that without the energy-absorbing groove 13 buffering the impact between the mounting hole 122 and the first wall 111, the impact force would be directly transmitted from the mounting hole 122 to the first wall 111, easily causing stress concentration at the connection between the two. Stress concentration can lead to local material yielding, resulting in excessive deformation or damage to that part. The energy-absorbing groove 13 effectively alleviates this stress concentration phenomenon and improves the overall stability of the battery box 10 when subjected to external forces.

[0176] In this embodiment, the mounting hole 122 can also be located on the side of the second wall 121 away from the first wall 111, that is, along the Y direction. The positional order of the structures can also be the first wall 111, the energy absorption groove 13, the second wall 121, and the mounting hole 122.

[0177] Figure 8 This is a partial structural diagram of a battery housing according to an embodiment of this application. Figure 8 As shown, the distance between the center line of the energy absorption groove 13 along the second direction and the first wall 111 is H1, and the minimum distance between the mounting hole 122 and the first wall 111 is H2. The ratio of H1 to H2 is 1:2.

[0178] It should be understood that the center line of the energy-absorbing groove 13 along the second direction coincides with the center line of the vertical line connecting the edge of the mounting hole 122 and the first wall 111, that is, the distance between the center line of the energy-absorbing groove 13 along the second direction and the first wall 111 is half of the minimum distance between the mounting hole 122 and the first wall 111.

[0179] In this embodiment, the optimal position of the energy-absorbing groove 13 on the energy transfer path is determined. When the energy generated by the collision is transferred from the mounting hole 122 to the first wall 111, the 1:2 ratio of H1 to H2 allows the energy-absorbing groove 13 to absorb energy at this position, converting more energy into its own deformation energy, thereby better protecting the components inside the battery box 10.

[0180] It should be understood that, in the manufacturing process of the battery box, the 1:2 distance ratio of H1 and H2 is beneficial to the design and processing of the mold, so that the forming of the energy absorption groove 13 and the mounting hole 122 is more accurate and stable.

[0181] When the mounting portion 12 has the mounting hole 122, the position of the energy absorption groove 13 along the Y direction can be located between the adjacent mounting holes 122, when the battery box 10 has the collision point, the position of the energy absorption groove 13 along the Y direction can be determined according to the collision point, when the mounting portion 12 has no mounting hole 122 and the collision point, the position of the energy absorption groove 13 along the Y direction can also be determined according to the position of the hollow structure 14, which will be introduced respectively as follows. Figures 9 to 12

[0182] Figure 9 Another partial structure diagram of the battery box of an embodiment of the present application is shown in FIG. 6. As shown in FIG. 6, the mounting portion 12 can include at least two mounting holes 122, and the center line of the energy absorption groove 13 along the third direction coincides with the center line of the adjacent two mounting holes 122 along the third direction. Figure 9

[0183] It should be understood that, along the Y direction, the energy absorption groove 13 is located in the middle region of the adjacent two mounting holes 122, and the mounting hole 122 can provide a certain strength structural support for the mounting portion 12. The middle region of the adjacent two mounting holes 122 is a weak region of the structural strength of the mounting portion 12, which is prone to local deformation and damage when the battery box 10 is subjected to external force. Therefore, the energy absorption groove 13 is arranged in the middle region of the adjacent two mounting holes 122 to reduce the impact of the collision on the weak region of the mounting portion 12.

[0184] Figure 10 Another partial structure diagram of the battery box of an embodiment of the present application is shown in FIG. 6. As shown in FIG. 6, the mounting portion 12 can include at least two mounting holes 122, and the center line of the energy absorption groove 13 along the third direction coincides with the center line of the adjacent two mounting holes 122 along the third direction. Figure 10 In the embodiment of the present application, the point A is the collision point, and the collision point A can be a test point when the battery device 100 is subjected to a collision test. The collision point A obtained through the test reflects the position of the battery box most likely to be impacted in actual use or simulation of actual scenarios. In this way, the collision situation of the battery box in the actual working environment can be more realistically simulated, so that the performance of the battery box can be more accurately evaluated.

[0185]

[0186] ​​​It should be understood that the center line of the energy absorption groove 13 along the Y direction coincides with the center of the collision point, so that when a collision occurs, the impact force generated by the collision can be transmitted along the most direct path to the energy absorption groove 13. Because the transmission path of the force is accurate, the energy absorption groove 13 can more efficiently absorb the collision energy. When the force is transmitted to the energy absorption groove 13 along the center line, the energy absorption groove 13 can fully play its energy absorption role, converting most of the collision energy into its own deformation energy, thereby reducing the energy transmitted to the inside of the battery box 10 and reducing the damage to the battery monomer 20.

[0187] Figure 11 Another structural view of the battery box of an embodiment of the present application. As shown in Figure 11 the hollow structure 14 includes a first hollow structure 141, and the center line of the first hollow structure 141 along the third direction coincides with the center line of the hollow structure 14 along the third direction, wherein the center line of the energy absorption groove 13 along the third direction coincides with the center line of the first hollow structure 141 along the third direction.

[0188] It should be understood that along the X direction, the first hollow structure 141 is located at the center of the hollow structure 14, that is, the hollow structure 14 includes an odd number of sub-hollow structures, and the first hollow structure 141 is the middle sub-hollow structure among the odd number of sub-hollow structures, for example, as shown in Figure 9 the hollow structure 14 includes three sub-hollow structures, and the first hollow structure 141 is the second sub-hollow structure along the X direction. For another example, the hollow structure 14 includes one sub-hollow structure, and the first hollow structure 141 is the hollow structure 14.

[0189] It should be understood that when the battery device 100 is subjected to a collision, the first hollow structure 141 is more likely to be overloaded at the center line along the Y direction, and unlike the two side sub-hollow structures, the first hollow structure 141 is located at the center position of the entire hollow structure 14 structure, and when subjected to an external force, the first hollow structure 141 does not have a frame 11 as a supporting structure around it like the remaining sub-hollow structures, and stress concentration phenomenon is likely to occur at the center line along the Y direction, and the load is relatively large.

[0190] In an embodiment of the present application, the first hollow structure 141 includes a plurality of battery monomer columns arranged along the Y direction, and at this time, the battery monomer column located in the middle of the first hollow structure 141 is most likely to deform and be damaged when subjected to a collision due to the lack of support. Therefore, the energy absorption groove 14 is arranged at the weakest position in the center of the first hollow structure 141 to reduce the impact of the collision on the central battery monomer column.

[0191] Figure 12 Another structural view of the battery box of an embodiment of the present application. As shown in Figure 12As shown, the hollow structure 14 includes two adjacent second hollow structures 142, the center line of the second hollow structures 142 along the third direction coincides with the center line of the hollow structure 14 along the third direction, and the center line of the energy absorption groove 13 along the third direction coincides with the center line of the second hollow structure 142 along the third direction.

[0192] It should be understood that along the X direction, the two second hollow structures 142 are located in the center of the hollow structure 14, that is, the hollow structure 14 includes an even number of sub hollow structures, and the second hollow structure 142 is the middle sub hollow structure among the even number of sub hollow structures. For example, the hollow structure 14 includes four sub hollow structures, and the second hollow structure 142 is the second and third sub hollow structures along the X direction. For another example, the hollow structure 14 includes two sub hollow structures, and the two second hollow structures 142 constitute the hollow structure 14.

[0193] It should be understood that similar to the odd number of sub hollow structures, when subjected to an external force, the second hollow structure 142 has no frame 11 as a supporting structure around it like the rest of the sub hollow structures, and stress concentration phenomenon is prone to occur at the center line thereof along the Y direction, and the load is relatively large. At this time, the battery cell column located in the middle of the second hollow structure 142 is most prone to deformation and damage when subjected to a collision due to the lack of support. Therefore, the energy absorption groove 14 is arranged at the weakest position in the center of the two second hollow structures 142 to reduce the impact of the collision on the central battery cell column.

[0194] In the embodiment of the present application, the number of energy absorption grooves 13 is multiple, and the multiple energy absorption grooves 13 are distributed on both sides of the hollow structure 14 along the second direction.

[0195] In the embodiment of the present application, the two sides of the battery box 10 have mounting portions 12 for connecting with external equipment, and when a collision occurs, if there is no energy absorption groove 13 distributed on both sides, the impact force may be concentrated on the mounting portion 12 and quickly transmitted to the inside of the battery box 10, causing structural deformation and even damage to the battery cell 20. The presence of the energy absorption groove 13 can disperse and absorb the impact force, protect the structural integrity of the battery box 10, and prolong the service life of the battery box 10.

[0196] It should be understood that when the hollow structure 14 includes an odd number of sub hollow structures, the number of energy absorption grooves 13 is at least two. For example, the number of energy absorption grooves 13 is two, which are distributed on both sides of the first hollow structure 141 along the X direction. When the hollow structure 14 includes an even number of sub hollow structures, the number of energy absorption grooves 13 is at least four. For example, the number of energy absorption grooves 13 is four, which are distributed on both sides of the two second hollow structures 142 along the X direction.

[0197] In order to make the energy absorption groove 13 better play the energy absorption role, the shape of the energy absorption groove 13 can be improved, which will be described below in combination withFigure 13 With Figure 14 introduction.

[0198] Figure 13 Another partial structural view of the battery box of an embodiment of the present application. As shown, the inner wall of the energy absorption groove 13 includes a first fillet 131 and a second fillet 132, the first fillet 131 is close to the first wall 111, and the second fillet 132 is close to the second wall 121, the radius of the first fillet 131 is less than or equal to the radius of the second fillet 132. Figure 13 It should be understood that the first fillet 131 is two fillets of the inner wall of the energy absorption groove 13 close to the first wall 111, and the shape of the first fillet 131 is arc-shaped. The second fillet 132 is two fillets of the inner wall of the energy absorption groove 13 close to the second wall 121, and the shape of the second fillet 132 is arc-shaped.

[0199] It should be understood that the radius of the first fillet 131 is less than or equal to the radius of the second fillet 132. When a collision occurs, the first fillet 131 is more prone to collapse and deform, so that the second wall 121 can better conform to the first wall 111 in the form of a surface. Specifically, when there are sharp internal corners (without fillets or with very small fillet radii) in the structure, stress will concentrate at these sharp internal corners under the action of external force, so that the first fillet 131 is more prone to collapse and deform.

[0200] In an embodiment of the present application, the collapse and deformation at the first fillet 131 absorb part of the energy generated by the collision. This energy absorption process makes the second wall 121 more stable in the process of approaching the first wall 111, reducing irregular deformation caused by sudden collision.

[0201]

[0202] Another partial structural view of the battery box of an embodiment of the present application. As shown, the inner wall of the energy absorption groove 13 includes a first inner wall 133 and a second inner wall 134, the first inner wall 133 is close to the first wall 111, the first inner wall 133 is perpendicular to the second inner wall 134, and there is a gap between the first inner wall 133 and the second inner wall 134. Figure 14 Figure 14 It should be understood that the first inner wall 133 is a longer inner wall of the inner wall of the energy absorption groove 13 close to the first wall 111, and the second inner wall 134 is an inner wall perpendicular to the first inner wall 133.

[0203] It should be understood that the gap between the first inner wall 133 and the second inner wall 134 can be set according to actual application, for example, as shown, a round hole is added at the gap, and the shape of the round hole is convenient for processing. In the manufacturing process, common processing methods such as drilling and punching can be used. It can also be triangular, quadrilateral, etc.

[0204] It should be understood that the gap between the first inner wall 133 and the second inner wall 134 can be set according to actual application, for example, as shown, a round hole is added at the gap, and the shape of the round hole is convenient for processing. In the manufacturing process, common processing methods such as drilling and punching can be used. It can also be triangular, quadrilateral, etc. Figure 12 It should be understood that the gap between the first inner wall 133 and the second inner wall 134 can be set according to actual application, for example, as shown, a round hole is added at the gap, and the shape of the round hole is convenient for processing. In the manufacturing process, common processing methods such as drilling and punching can be used. It can also be triangular, quadrilateral, etc.​

[0205] It should be understood that when there is a gap between the first inner wall 133 and the second inner wall 134, the energy absorption groove 13 is more prone to collapse deformation on the side close to the first wall 111. This is because the presence of the gap disrupts the continuity of the inner wall of the energy absorption groove 13, making it easier for stress to concentrate near the gap when subjected to external force, thereby making it easier for the gap to collapse and deform.

[0206] Figure 15 Another partial structural view of the battery box according to an embodiment of the present application. As shown in the figure, Figure 15 In the embodiment of the present application, the energy absorption groove 13 has a size L in the second direction, and the hollow structure 14 includes at least one third hollow structure 143, which has a size L1 in the second direction, and the ratio of L to L1 is less than or equal to 1 / 3.

[0207] It should be understood that if the hollow structure includes multiple third hollow structures 143, the size of the third hollow structure in the X direction is L1.

[0208] It should be understood that the ratio of L to L1 can be 1 / 5, 1 / 4, or 1 / 3.

[0209] In the embodiment of the present application, if the ratio is too large, the size L of the energy absorption groove in the X direction is too large, which will occupy too much space between the edge beam 110 and the mounting portion 12. The edge beam 110 is usually the main support and load-bearing component, and the mounting portion 12 is used to connect with external equipment. If the size of the energy absorption groove 13 is too large, it may change the connection strength of the edge beam 110 and the mounting portion 12 and the structural strength of the mounting portion 12.

[0210] It should be understood that when the battery box 10 is subjected to external impact force, the force will propagate inside the structure. Because the ratio of L to L1 is less than or equal to 1:3, the size of the energy absorption groove 13 is relatively small, which makes it possible for the energy absorption groove 13 to effectively disperse the impact force without occupying too much space during force transmission.

[0211] In the embodiment of the present application, the size L of the energy absorption groove in the X direction is generally greater than or equal to 150 mm.

[0212] As shown in the figure, Figure 6 and 15 In the embodiment of the present application, the size W of the energy absorption groove 13 in the third direction is W1, and the size W of the transition structure 15 in the third direction is W1, and the ratio of W to W1 is less than or equal to 0.8 and greater than or equal to 0.5.

[0213] It should be understood that the ratio of W to W1 can be 0.5, 0.6, 0.7, or 0.8.

[0214] It should be understood that when the ratio of W to W1 is within a given range, the energy absorption groove 13 and the transition structure 15 can achieve good cooperation in the process of force transmission. The energy absorption groove 13 serves as the main energy absorption component and will deform to absorb energy when subjected to external impact force. Suitable size ratio can enable the energy absorption groove 13 and the transition structure 15 to effectively cooperate in the process of force transmission from the transition structure 15 to the energy absorption groove 13.

[0215] It should be understood that the ratio of W to W1 within a given range enables the transition structure 15 to provide appropriate support for the energy absorption groove 13. The size of the transition structure 15 relative to the energy absorption groove 13 is not too small, and when the energy absorption groove 13 deforms, the transition structure 15 can withstand the reaction force transmitted by the energy absorption groove 13 and maintain the stability of the entire structure.

[0216] In the embodiments of the present application, the size W of the energy absorption groove 13 along the Y direction is generally greater than or equal to 10 mm.

[0217] According to some embodiments of the present application, the present application also provides a battery device 100, which can include a battery box 10 and a plurality of battery monomers 20. The battery box 10 can include a frame 11, a mounting portion 12, and an energy absorption groove 13. The frame 11 forms a hollow structure 14 with a containing space, which can contain the battery monomers 20. The frame 11 can include a side beam 110, which can include a first wall 111 away from the hollow structure 14. The mounting portion 12 is located on the side of the side beam 110 away from the hollow structure 14, and the mounting portion 12 is fixedly connected with the side beam 110. The mounting portion 12 can include a second wall 121, which is oppositely arranged with the first wall 111. The energy absorption groove 13 is located between the first wall 111 and the second wall 121 and penetrates along a first direction. The first direction is perpendicular to the top or bottom of the battery box 10, and the plurality of battery monomers 20 are contained in the battery box 10.

[0218] It should be understood that the battery box 10 can also include the battery box 10 in any of the above embodiments.

[0219] In the embodiments of the present application, when the battery device 100 is impacted, the energy absorption groove 13 can convert most of the energy into its own deformation energy through deformation, thereby reducing the energy transmitted to the inside of the battery device 100, reducing the deformation and damage of the battery device 100, and improving the safety performance of the battery device 100.

[0220] According to some embodiments of the present application, the present application also provides a power-using equipment, which can include a battery device 100 for providing electric energy.

[0221] The battery device 100 can include a battery box 10 and a plurality of battery cells 20. The battery box 10 can include a frame 11, a mounting portion 12, and an energy absorption groove 13. The frame 11 forms a hollow structure 14 having a receiving space, the hollow structure 14 can accommodate the battery cells 20, the frame 11 can include a side beam 110, the side beam 110 can include a first wall 111 away from the hollow structure 14; the mounting portion 12 is located on the side of the side beam 110 away from the hollow structure 14, the mounting portion 12 is fixedly connected with the side beam 110, the mounting portion 12 can include a second wall 121, the second wall 121 is arranged opposite to the first wall 111; the energy absorption groove 13 is located between the first wall 111 and the second wall 121, and the energy absorption groove 13 penetrates in the first direction; wherein the first direction is a direction perpendicular to the top or bottom of the battery box 10, and the plurality of battery cells 20 are accommodated in the battery box 10.

[0222] It should be understood that the battery box 10 can also include the battery box 10 in any of the above embodiments.

[0223] The electrical equipment can be the equipment or system of any of the above application battery devices 100.

[0224] According to some embodiments of the present application, referring to Figures 5 to 15 , the present application provides a battery box, the battery box 10 includes a frame 11, a mounting portion 12, and an energy absorption groove 13. The frame 11 forms a hollow structure 14 having a receiving space, the hollow structure 14 accommodates the battery cells 20, the frame 11 includes a side beam 110, the side beam 110 includes a first wall 111 away from the hollow structure 14; the mounting portion 12 is located on the side of the side beam 110 away from the hollow structure 14, the mounting portion 12 is fixedly connected with the side beam 110, the mounting portion 12 includes a second wall 121, the second wall 121 is arranged opposite to the first wall 111; the battery box 10 further includes a transition structure 15, the transition structure 15 is arranged between the side beam 110 and the mounting portion 12, and is fixedly connected with the side beam 110 and the mounting portion 12 respectively; the energy absorption groove 13 is arranged in the transition structure 15, located between the first wall 111 and the second wall 121, and the energy absorption groove 13 penetrates the transition structure 15 in the Y direction. The center line of the energy absorption groove 12 in the X direction coincides with the center line of the transition structure 15 in the X direction, and the minimum distance between the energy absorption groove 12 and the transition structure 15 in the Y direction is greater than or equal to 0.5mm.

[0225] The hollow structure 14 includes a first hollow structure 141, the center line of the first hollow structure 141 in the Y direction coincides with the center line of the hollow structure 14 in the Y direction, wherein the center line of the energy absorption groove 13 in the Y direction coincides with the center line of the first hollow structure 141 in the Y direction, and a plurality of energy absorption grooves 13 are distributed on both sides of the hollow structure 14 in the X direction.

[0226] Optionally, the hollow structure 14 comprises two adjacent second hollow structures 142, the center line of the second hollow structures 142 along the Y direction coincides with the center line of the hollow structure 14 along the Y direction, wherein the center line of the energy absorption groove 13 along the Y direction coincides with the center line of the second hollow structure 142 along the Y direction, and the plurality of energy absorption grooves 13 are distributed on both sides of the hollow structure 14 along the X direction.

[0227] The inner wall of the energy absorption groove 13 comprises a first chamfer 131 and a second chamfer 132, the first chamfer 131 is close to the first wall 111, the second chamfer 132 is close to the second wall 121, and the radius of the first chamfer 131 is less than or equal to the radius of the second chamfer 132.

[0228] Optionally, the inner wall of the energy absorption groove 13 comprises a first inner wall 133 and a second inner wall 134, the first inner wall is close to the first wall 111, the first inner wall 133 and the second inner wall 134 are perpendicular, and there is a gap between the first inner wall 133 and the second inner wall 134.

[0229] The size of the energy absorption groove 13 along the second direction is L, the hollow structure 14 comprises at least one third hollow structure 143, the size of the third hollow structure 143 along the second direction is L1, and the ratio of L to L1 is less than or equal to 1 / 3. The size of the energy absorption groove 13 along the third direction is W, the size of the transition structure 15 along the third direction is W1, the ratio of W to W1 is greater than or equal to 0.5 and less than or equal to 0.8.

[0230] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all 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 the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery case characterized by comprising: The battery box comprises: a frame (11) forming a hollow structure (14) with a containing space accommodating a battery monomer (20), the frame (11) comprising a side beam (110) comprising a first wall (111) away from the hollow structure (14); a mounting portion (12) located on the side of the side beam (110) away from the hollow structure (14), the mounting portion (12) being fixedly connected with the side beam (110), the mounting portion (12) comprising a second wall (121) arranged opposite to the first wall (111); an energy absorption groove (13) located between the first wall (111) and the second wall (121), the energy absorption groove (13) penetrating in a first direction; wherein the first direction is perpendicular to the top or bottom of the battery box.

2. The battery pack of claim 1, wherein The energy absorption groove (13) extends in a second direction, so that the energy absorption groove (13) collapses and deforms when the battery box is subjected to a collision, causing the first wall (111) and the second wall (121) to fit, wherein the second direction is parallel to the extension direction of the side beam (110) and perpendicular to the first direction.

3. The battery pack of claim 2, wherein, The battery box comprises a transition structure (15) arranged between the side beam (110) and the mounting portion (12), the transition structure (15) being fixedly connected with the side beam (110) and the mounting portion (12) respectively, wherein the energy absorption groove (13) is arranged in the transition structure (15), and the energy absorption groove (13) penetrates the transition structure (15) in the first direction.

4. The battery pack of claim 3, wherein The center line of the energy absorption groove (13) in the second direction coincides with the center line of the transition structure (15) in the second direction.

5. The battery pack of claim 3, wherein The minimum distance between the energy absorption groove (13) and the transition structure (15) in a third direction is greater than or equal to 0.5mm, wherein the third direction is perpendicular to the first direction and perpendicular to the second direction.

6. The battery pack of claim 1, wherein, The mounting portion (12) comprises a mounting hole (122) located on the side of the second wall (121) facing the first wall (111), and the energy absorption groove (13) is located in the intermediate region between the mounting hole (122) and the first wall (111).

7. The battery pack of claim 6, wherein, The distance between the center line of the energy absorption groove (13) in the second direction and the first wall (111) is H1, and the minimum distance between the mounting hole (122) and the first wall (111) is H2, the ratio of H1 to H2 being 1:

2.

8. The battery pack of any one of claims 2 to 7, wherein, The hollow structure (14) comprises a first hollow structure (141) whose center line in a third direction coincides with the center line of the hollow structure (14) in the third direction, wherein the center line of the energy absorption groove (13) in the third direction coincides with the center line of the first hollow structure (141) in the third direction, The third direction is perpendicular to the first direction and perpendicular to the second direction.

9. The battery pack of any one of claims 2 to 7, wherein, The hollow structure (14) comprises two adjacent second hollow structures (142), and the center line of the energy absorption groove (13) in the third direction coincides with the center line of the second hollow structure (142) in the third direction. The third direction is perpendicular to the first direction and perpendicular to the second direction.

10. The battery pack of any one of claims 2 to 7, wherein, The number of the energy absorption grooves (13) is multiple, and the multiple energy absorption grooves (13) are distributed on both sides of the hollow structure (14) in the second direction.

11. The battery pack of any one of claims 1 to 7, wherein, The inner wall of the energy absorption groove (13) comprises a first fillet (131) and a second fillet (132), the first fillet (131) is close to the first wall (111), the second fillet (132) is close to the second wall (121), and the radius of the first fillet (131) is less than or equal to the radius of the second fillet (132).

12. The battery pack of any one of claims 1 to 7, wherein, The inner wall of the energy absorption groove (13) comprises a first inner wall (133) and a second inner wall (134), the first inner wall (133) is close to the first wall (111), the first inner wall (133) is perpendicular to the second inner wall (134), and there is a gap between the first inner wall (133) and the second inner wall (134).

13. The battery pack of any one of claims 2 to 7, wherein, The size of the energy absorption groove (13) in the second direction is L, the hollow structure (14) comprises at least one third hollow structure (143), the size of the third hollow structure (143) in the second direction is L1, and the ratio of L to L1 is less than or equal to 1 / 3.

14. The battery pack of any one of claims 3 to 5, wherein, The size of the energy absorption groove (13) in the third direction is W, the size of the transition structure (15) in the third direction is W1, the ratio of W to W1 is greater than or equal to 0.5 and less than or equal to 0.8, The third direction is perpendicular to the first direction and perpendicular to the second direction.

15. A battery device characterized by comprising: It comprises: A plurality of battery monomers; A battery box body comprising the battery box body according to any one of claims 1 to 14, wherein the plurality of battery monomers are accommodated in the battery box body.

16. An electrical device, characterized by It comprises: A battery device comprising the battery device according to claim 15, the battery device being used to provide electric energy. It comprises:

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