Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment. The battery monomer comprises an electrode assembly, a shell and a switching assembly, the electrode assembly includes a tab, and the housing includes an electrode terminal. The switching assembly comprises a switching piece and a phase change heat absorption piece, and the switching piece is used for being electrically connected with the electrode lug and the electrode terminal. The phase change heat absorption piece at least covers the surface of part of the switching piece and comprises a phase change material, and the phase change material is used for exchanging heat with the switching piece. According to the technical scheme, heat accumulation on the switching piece can be reduced, and the quick charging performance of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] With the development of new energy technology, batteries are applied more and more widely, such as in mobile phones, notebook computers, electric vehicles, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric tools, etc.

[0003] During the operation of the battery, heat is generated, and the heat accumulation causes the temperature to rise, which causes the temperature of the adapter piece in the battery monomer to rise sharply, reducing the charging and discharging efficiency of the battery monomer. Utility model content

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and an electric equipment, which can reduce the heat accumulation on the adapter piece and improve the rapid charging performance of the battery monomer.

[0005] In a first aspect, the present application provides a battery monomer, which comprises an electrode assembly, a shell and an adapter assembly. The electrode assembly comprises a tab, and the shell comprises an electrode terminal. The adapter assembly comprises an adapter piece and a phase change heat sink, and the adapter piece is used to electrically connect the tab and the electrode terminal. The phase change heat sink covers at least part of the surface of the adapter piece, and the phase change heat sink comprises a phase change material, which is used to exchange heat with the adapter piece.

[0006] In the technical scheme of the present application, the electrode assembly is the main component for converting electrical energy and chemical energy in the battery monomer, and the electrical energy of the tab of the electrode assembly is transmitted to the outside. The shell is provided to provide a stable environment for the electrode assembly, reducing damage to the electrode assembly caused by impurities or moisture from the outside. The adapter piece of the adapter assembly is electrically connected to the electrode terminal and the tab to transmit the electrical energy of the electrode assembly. The adapter piece is connected between the electrode terminal and the tab to transmit the electrical energy of the electrode assembly. In addition, the phase change heat sink in the adapter assembly is in contact with the adapter piece and absorbs the heat on the adapter piece to reduce the heat accumulation on the adapter piece, improve the overcurrent capacity of the adapter piece, and thus improve the rapid charging performance of the battery monomer and improve the stability of the battery monomer during operation.

[0007] In some embodiments, the adapter piece and the phase change heat sink are formed by injection molding. In the above structure, the adapter piece and the phase change heat sink are formed by injection molding, which improves the bonding strength between them, enhances the heat absorption efficiency of the phase change heat sink, reduces the temperature rise speed of the adapter piece, and thus improves the fast charging performance of the battery monomer.

[0008] In some embodiments, the phase change heat sink comprises at least one of a paraffin-polyolefin composite heat sink, a paraffin-elastic body composite heat sink, a paraffin-porous ceramic composite heat sink, a fatty acid-polyolefin composite heat sink, and a hydrated salt-ceramic composite heat sink. The composite heat sink described above has a slow temperature drop while absorbing heat, can reduce the impact on other components of the battery monomer, and can ensure the stability of the structure to improve the stability of the battery monomer during operation.

[0009] In some embodiments, the phase change heat sink has a cavity therein, and the adapter piece is arranged in the cavity. In the structure described above, the cavity is arranged in the phase change heat sink to limit the adapter piece, thereby improving the connection stability of the adapter piece and the electrode terminal and the tab.

[0010] In some embodiments, the phase change heat sink comprises a first wall, a second wall, and a side wall. The first wall is arranged towards the shell, and the first wall is provided with a first through hole to connect the adapter piece and the electrode terminal. The second wall is arranged opposite to the first wall, and the second wall is arranged towards the electrode assembly, and the second wall is provided with a second through hole to connect the adapter piece and the tab. The side wall is connected to the first wall and the second wall. The first wall, the second wall, and the side wall together enclose a cavity. In the structure described above, the plurality of walls enclose the cavity to accommodate the adapter piece while maximizing the contact area between the phase change heat sink and the adapter piece, thereby improving the heat exchange efficiency and reducing the heat accumulation on the adapter piece. The through holes are provided on the first wall and the second wall to facilitate the electrical connection between the adapter piece and the electrode assembly and the electrode terminal, thereby improving the assembly convenience of the adapter assembly.

[0011] In some embodiments, the adapter piece comprises a body and a pole connecting portion. The body is arranged between the shell and the electrode assembly, and the pole connecting portion is arranged on the body. At least a portion of the pole connecting portion corresponds to the first through hole. In the structure described above, the pole connecting portion is arranged corresponding to the first through hole to increase the connection area of the adapter piece and the electrode terminal, thereby improving the connection strength and stability of the adapter piece and the electrode terminal and improving the current stability of the adapter piece.

[0012] In some embodiments, the body is further provided with a welding area for connecting the tab. The welding area corresponds to the second through hole. The body is arranged on one side of the electrode assembly along a first direction. The pole connecting portion and the welding area are arranged on the body along a second direction. The first direction and the second direction are perpendicular to each other. In the structure described above, the welding area is arranged to improve the connection strength and stability between the tab and the adapter piece. The second through hole facilitates the welding connection between the adapter piece and the tab, thereby improving the assembly efficiency of the adapter assembly.

[0013] In some embodiments, the welding area protrudes from the body towards a side surface of the electrode assembly. In the above structure, by virtue of the protruding arrangement of the welding area, the area of the tab welding connection is increased, the flow area is increased, and the stability of the connection between the tab and the adapter piece is improved.

[0014] In some embodiments, the number of welding areas is two, and the two welding areas are oppositely arranged along the third direction on the body, and the second through hole is correspondingly provided in two. In the above structure, by increasing the number of welding areas, the area of the tab welding connection is increased, the flow area is increased, and the stability of the connection between the tab and the adapter piece is improved.

[0015] In some embodiments, the phase change heat absorption piece is provided with a first opening at one end along the second direction, and the opening is used for mounting the adapter piece. In the above structure, by virtue of the opening, the adapter piece is conveniently loaded into the phase change heat absorption piece from the opening, and the assembly efficiency is improved.

[0016] In some embodiments, the phase change heat absorption piece includes a first sleeve and a second sleeve arranged along the second direction, the first sleeve is provided with a second opening, and the second sleeve is provided with a third opening. In the above structure, the phase change heat absorption piece is divided into two sleeve forms, and the efficiency and convenience of the phase change heat absorption piece installation are improved.

[0017] In some embodiments, the shell includes an end cover and a shell body arranged along the first direction, the electrode terminal is arranged on the end cover, the electrode assembly is arranged in the shell body, the end cover is provided with a receiving groove recessed along the first direction towards a side surface of the electrode assembly, and at least part of the welding area is arranged in the receiving groove. In the above structure, by virtue of the receiving groove, the accommodation space of the tab is increased, and the tab and the electrode terminal are arranged along the second direction, the space along the second direction of the end cover is fully utilized, the space utilization rate of the shell is improved, and the energy density of the battery monomer is improved.

[0018] In some embodiments, the adapter piece includes a first part and a second part connected in sequence along the second direction, the first direction is perpendicular to the second direction, the pole post connecting part is arranged on the first part, the welding area is arranged on the second part, the first part and the second part are connected through a third part, and the first part and the second part are arranged on opposite sides of the third part along the first direction. In the above structure, the first part and the second part of the adapter piece are arranged along the second direction, the space along the second direction of the end cover is utilized, and the space utilization rate is improved. Moreover, the second part is staggered relative to the first part along the first direction to form a relatively bent structure, which is adapted to the structure of the end cover receiving groove, the fit between the adapter piece and the end cover and the electrode assembly is improved, the connection stability between the adapter piece and the electrode terminal and the tab is improved, and the stability of the battery monomer operation is improved.

[0019] In a second aspect, the application provides a battery device including the battery monomer in the above embodiments.

[0020] In a third aspect, the present application provides a use electric device, comprising the battery device in the above embodiments, the battery device is used for providing electric energy.

[0021] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0022] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0023] Figure 1 The structural schematic diagram of the vehicle provided for some embodiments of the present application is shown in the figure;

[0024] Figure 2 The exploded schematic diagram of the battery device provided for some embodiments of the present application is shown in the figure;

[0025] Figure 3 The exploded structural schematic diagram of the battery cell provided for some embodiments of the present application is shown in the figure;

[0026] Figure 4 The structural schematic diagram of the adapter assembly provided for some embodiments of the present application is shown in the figure;

[0027] Figure 5 The structural schematic diagram of the adapter piece provided for some embodiments of the present application is shown in the figure;

[0028] Figure 6 The structural schematic diagram of the phase change heat absorption member provided for some embodiments of the present application is shown in the figure;

[0029] Figure 7 The structural schematic diagram of the phase change heat absorption member provided for some other embodiments of the present application is shown in the figure;

[0030] Figure 8 The structural schematic diagram of the battery cell provided for some embodiments of the present application is shown in the figure;

[0031] Figure 9 The structural schematic diagram of the battery cell provided for some embodiments of the present application is shown in the figure;

[0032] Figure 10 The structural schematic diagram of the battery cell provided for some embodiments of the present application is shown in the figure; Figure 9 The enlarged structural schematic diagram of part A in the figure is shown in the figure;

[0033] Figure 11 The structural schematic diagram of the adapter piece provided for some embodiments of the present application is shown in the figure;

[0034] Figure 12A structure schematic diagram of a phase change heat absorption member provided for some embodiments of the present application;

[0035] Figure 13 A structure schematic diagram of an adapter assembly provided for some embodiments of the present application.

[0036] Detailed description of the reference signs

[0037] 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, box; 5a, first box part; 5b, second box part; 6, battery cell; 10, electrode assembly; 101, tab; 20, outer shell; 30, end cover; 301, accommodating groove; 302, protruding part; 40, housing; 50, electrode terminal; 60, adapter assembly; 601, adapter sheet; 602, phase change heat absorption member; 603, first wall; 604, second wall; 605, side wall; 606, first through hole; 607, body; 608, pole connecting part; 609, welding area; 610, second through hole; 611, first opening; 612, first sleeve; 613, second sleeve; 614, second opening; 615, third opening; 616, first part; 617, second part; 618, third part; 619, first heat absorption member; 620, second heat absorption member; 621, third heat absorption member; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0038] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0041] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0042] In the description of the embodiments of the present application, the term“and / or” merely describes an associated relationship with associated objects, and means that three relationships can exist, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” in this paper generally means that the front and rear associated objects are a“or” relationship.

[0043] In the description of the embodiments of the present application, the term“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).

[0044] In the description of the embodiments of the present application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise expressly specified and limited, the technical terms“mounting”,“connecting”,“connecting”,“fixing” and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] The term“and / or” in this application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” in this paper generally means that the front and rear associated objects are a“or” relationship.

[0047] 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.

[0048] In the embodiments of the present application, "parallel" not only includes the case of absolute parallel, but also includes the case of approximately parallel as generally recognized in engineering; at the same time, "perpendicular" not only includes the case of absolute perpendicular, but also includes the case of approximately perpendicular as generally recognized in engineering. Exemplarily, the included angle between two directions is 85°-95°, which can be considered as the two directions being perpendicular; the included angle between two directions is 0°-5°, which can be considered as the two directions being parallel.

[0049] "Multiple" appearing in the present application refers to two or more (including two).

[0050] 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.

[0051] 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., which are not limited in the embodiments of the present application.

[0052] 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 prevent the positive electrode and the negative electrode from short-circuiting, and at the same time, the active ions can pass through.

[0053] 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.

[0054] 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.

[0055] 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, 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 (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0056] 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 simply 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 simply as NCM 333 ), LiNi 0. o 0.2 Mn 0.3 O2 (which can also be referred to simply as NCM 523 ), LiNi 0. o 0.25 Mn 0.25 O2 (which can also be referred to simply as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to simply as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to simply as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05O2) and modified compounds thereof, and the like. The modified compounds refer to substances obtained by modification means such as doping or coating on the basis of the above-mentioned substances.

[0057] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0058] 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, titanium, or silver, and the like 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, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0059] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0060] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0061] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, and the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a 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.

[0062] 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, and the like. When the foamed metal is used as a negative electrode sheet, the surface of the foamed metal can not be provided with a negative electrode active material, or can be provided with a negative electrode active material.

[0063] As an example, the negative electrode active material can be filled or / and deposited in the negative electrode current collector.

[0064] 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.

[0065] In some embodiments, the electrode assembly further comprises a separator disposed between the positive electrode and the negative electrode.

[0066] In some embodiments, the separator is a separator film. The type of separator film is not particularly limited in the present application, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0067] 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. 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 respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can be applied to the surface of the separator film.

[0068] 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 functions to transport ions and separate the positive and negative electrodes.

[0069] In some embodiments, the battery cell further comprises an electrolyte that functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0070] The liquid electrolyte includes an electrolyte salt and a solvent.

[0071] 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 difluorobis(oxalato)borate, lithium bis(oxalato)borate, lithium difluorobis(oxalato)phosphate, and lithium tetrafluorobis(oxalato)phosphate.

[0072] 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, butanedisulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether-based solvent. The ether-based 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 crown ether.

[0073] In some embodiments, the electrolyte can also optionally 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 / fast 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.

[0074] The gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0075] The solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0076] As an example, the polymer of the polymer solid 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.

[0077] As an example, the inorganic solid electrolyte can be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0078] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0079] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of a wound structure and a stacked structure.

[0080] 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.

[0081] In some embodiments, the electrode assembly is a stacked structure.

[0082] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0083] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0084] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded segments that are stacked.

[0085] As an example, the separators can be provided in multiple numbers, each being provided between any adjacent positive electrode sheet or negative electrode sheet.

[0086] As an example, the separators can be provided in a continuous manner, by being provided between any adjacent positive electrode sheet or negative electrode sheet in a folding or winding manner.

[0087] In some embodiments, the electrode assembly can have a shape of a cylinder, a flat shape, or a multi-prism shape, etc.

[0088] In some embodiments, the electrode assembly is provided with tabs, which can guide current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0089] In some embodiments, the battery cell can include a housing.

[0090] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tabs. The electrode terminal can be directly connected to the tabs, or indirectly connected to the tabs through a jumper. The electrode terminal can be provided on an end cover, or on the housing.

[0091] In a battery cell, a jumper is usually provided to electrically connect the electrode assembly to the electrode terminal, so as to transmit the electrical energy of the electrode assembly. In order to improve the fast charging performance of the battery, the jumper in the battery cell must carry a higher current. However, a large current can cause a sharp rise in the temperature of the jumper, and the heat accumulation can reduce the fast charging performance of the battery cell, and also poses a safety threat.

[0092] In view of this, the present application provides a battery cell. The electrode assembly in the battery cell is the main component for converting electrical energy into chemical energy, and the tabs in the electrode assembly transmit the electrical energy of the main body of the electrode assembly to the outside. The housing is provided to provide a stable environment for the electrode assembly, so as to reduce damage to the electrode assembly caused by impurities or moisture from the outside. The jumper of the jumper assembly is electrically connected to the electrode terminal and the tab, so as to transmit the electrical energy of the electrode assembly. The jumper is connected between the electrode terminal and the tab, so as to transmit the electrical energy of the electrode assembly. In addition, the phase change heat sink in the jumper assembly is in contact with the jumper and absorbs the heat on the jumper, so as to reduce the heat accumulation on the jumper, improve the overcurrent capacity of the jumper, and thus improve the fast charging performance of the battery cell and the stability of the battery cell during operation.

[0093] The battery device 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 manner through a busbar component.

[0094] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0095] 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 by a cable tie.

[0096] In some embodiments, the battery device can be a battery pack, which includes a box and one or more battery cell assemblies, the battery cell assemblies being accommodated in the box.

[0097] As an example, the battery cell assembly can be a battery module, which is accommodated in the box by fixing the battery module in the box.

[0098] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0099] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0100] As an example, the box 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 an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0101] In some embodiments, the box can be part of the chassis structure of a vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0102] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.

[0103] The electric device 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, such as a game machine, 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, such as 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 electric device is not specially limited in the embodiments of the present application.

[0104] The following embodiments take the vehicle as an example for convenience of description.

[0105] Figure 1 The structure schematic diagram of the vehicle provided in some embodiments of the present application.

[0106] As shown in Figure 1 , the vehicle 1 is internally provided with a battery device 2, which can be arranged at the bottom, the head, or the tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as the operating power supply of the vehicle 1.

[0107] The vehicle 1 can further include a controller 3 and a motor 4, and the controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the working power demand of the vehicle 1 during starting, navigation, and driving.

[0108] In some embodiments of the present application, the battery device 2 can not only be used as the operating power supply of the vehicle 1, but also be used as the driving power supply of the vehicle 1, to replace or partially replace the fuel or natural gas to provide driving power for the vehicle 1.

[0109] Figure 2 The explosion schematic diagram of the battery provided in some embodiments of the present application. As shown in Figure 2 , the battery device 2 includes a box body 5 and a battery monomer 6, and the battery monomer 6 is contained in the box body 5. The battery monomer 6 can be the smallest unit constituting the battery.

[0110] The box 5 is used to accommodate the battery cell 6, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box part 5a and a second box part 5b, the first box part 5a and the second box part 5b are mutually covered, and the first box part 5a and the second box part 5b jointly define an accommodation space for accommodating the battery cell 6. The second box part 5b can be a hollow structure with one end open, and the first box part 5a is a plate-shaped structure, which is covered on the open side of the second box part 5b to form the box 5 with the accommodation space; both the first box part 5a and the second box part 5b can also be a hollow structure with one side open, and the open side of the first box part 5a is covered on the open side of the second box part 5b to form the box 5 with the accommodation space. Of course, the first box part 5a and the second box part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0111] To improve the sealing performance of the first box part 5a and the second box part 5b after being connected, a sealing member such as sealing glue, a sealing ring, etc. can be arranged between the first box part 5a and the second box part 5b.

[0112] Suppose that the first box part 5a is covered on the top of the second box part 5b, the first box part 5a can also be called an upper box cover, and the second box part 5b can also be called a lower box.

[0113] In the battery device 2, the battery cell 6 can be one or multiple. If the battery cell 6 is multiple, the multiple battery cells 6 can be connected in series, in parallel or in a mixed manner, and the mixed manner means that the multiple battery cells 6 are connected in series and in parallel.

[0114] The multiple battery cells 6 can be directly connected in series, in parallel or in a mixed manner, and the whole formed by the multiple battery cells 6 is accommodated in the box 5; of course, the multiple battery cells 6 can be first connected in series, in parallel or in a mixed manner to form a battery module, and the multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the box 5.

[0115] Please refer to Figures 3 to 6 , Figure 3 the explosion structure diagram of the battery cell provided by some embodiments of the present application, Figure 4 the structure diagram of the adapter assembly provided by some embodiments of the present application, Figure 5 the structure diagram of the adapter piece provided by some embodiments of the present application, Figure 6 the structure diagram of the phase change heat absorption member provided by some embodiments of the present application.

[0116] As shown in the figure, the embodiment of the present application provides a battery cell 6, which comprises an electrode assembly 10, a shell 20, and a transition assembly 60. The electrode assembly 10 comprises a tab 101, and the shell 20 comprises an electrode terminal 50. The transition assembly 60 comprises a transition sheet 601 and a phase change heat sink 602, and the transition sheet 601 is used to electrically connect the tab 101 and the electrode terminal 50. The phase change heat sink 602 covers at least part of the surface of the transition sheet 601, and the phase change heat sink 602 comprises a phase change material, which is used to exchange heat with the transition sheet 601.

[0117] The electrode assembly 10 can comprise a main body and a tab 101 connected to the main body. The main body comprises a positive electrode sheet, a separator, and a negative electrode sheet which are stacked. The positive electrode sheet, the separator, and the negative electrode sheet are wound into shape. The positive electrode sheet comprises a positive electrode current collector and a positive electrode active material coated on the positive electrode current collector, and the negative electrode sheet comprises a negative electrode current collector and a negative electrode active material on the negative electrode current collector. The tab 101 is made of an electrically conductive material, and the positive electrode tab 101 is connected to the positive electrode current collector, and the negative electrode tab 101 is connected to the negative electrode tab 101.

[0118] The shell 20 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 20), or an aluminum-plastic film, etc. As an example, the battery cell 6 can be a cylindrical battery cell 6, a prismatic battery cell 6, a soft-pack battery cell 6, or other shapes of battery cells 6, and the prismatic battery cell 6 comprises a square shell battery cell 6, a blade-shaped battery cell 6, a multi-prismatic battery, such as a hexagonal prismatic battery, etc., which is not particularly limited by the present application. The shell 20 comprises an end cover 30 and a shell body 40, and the shell body 40 is provided with an opening, and the end cover 30 is provided on the opening. The shell body 40 can be provided with one or more openings. The end cover 30 can also be provided with one or more. The shell 20 is provided with at least one electrode terminal 50, and the electrode terminal 50 is electrically connected to the tab 101 through the transition sheet 601.

[0119] The phase change heat sink 602 refers to a heat sink made of a phase change material for absorbing heat from the transition sheet 601. The phase change material refers to a substance that changes state and can provide latent heat when the temperature remains unchanged or changes little. Its phase change process can be melting from solid to liquid, or solidification from liquid to solid, or other state transitions. The phase change material can absorb or release a large amount of latent heat during the phase change, so it has a high heat storage density. During the phase change, the temperature of the phase change material remains unchanged or fluctuates within a small range, forming a wide temperature platform.

[0120] The phase change material can absorb more heat while keeping its temperature change small, so as to reduce the impact on the end cover 30 or other components of the battery monomer 6. Using the phase change material to manufacture the heat absorption piece can absorb the heat released during the operation of the adapter sheet 601, reduce the heat accumulation on the adapter sheet 601, reduce the temperature rise speed of the adapter sheet 601, improve the overcurrent capacity of the adapter sheet 601, and thus improve the fast charging performance and operation stability of the battery monomer 6.

[0121] In the technical scheme of the embodiment of the application, the electrode assembly 10 is the main component for converting electrical energy and chemical energy in the battery monomer 6, and the tab 101 in the electrode assembly 10 transmits electrical energy of the main part of the electrode assembly 10 to the outside. The shell 20 is arranged to provide a stable environment for the electrode assembly 10, so as to reduce damage to the electrode assembly 10 caused by impurities or moisture from the outside. The adapter sheet 601 of the adapter assembly 60 is electrically connected to the electrode terminal 50 and the tab 101, so as to transmit the electrical energy of the electrode assembly 10. The adapter sheet 601 is connected between the electrode terminal 50 and the tab 101, and transmits the electrical energy of the electrode assembly 10. In addition, the phase change heat absorption piece 602 is arranged in the adapter assembly 60, and is in contact with the adapter sheet 601 and absorbs heat on the adapter sheet 601, so as to reduce heat accumulation on the adapter sheet 601, improve the overcurrent capacity of the adapter sheet 601, and thus improve the fast charging performance of the battery monomer 6 and improve the stability of the battery monomer 6 during operation.

[0122] In some embodiments of the application, the adapter sheet 601 and the phase change heat absorption piece 602 are formed by injection molding.

[0123] Injection molding is a casting process that involves injecting molten material into a prepared mold and allowing the material to cool and solidify before being ejected. For example, the already formed adapter sheet 601 can be placed in the molding cavity of the mold, and then the phase change material is injected into the molding cavity of the mold for injection molding. After cooling, the phase change material is tightly and firmly connected with the adapter sheet 601, and the adapter sheet 601 is embedded in the phase change heat absorption piece 602.

[0124] The adapter sheet 601 and the phase change heat absorption piece 602 are formed by injection molding, and the combination between them is more tight, and the bonding strength is significantly improved. This tight combination helps to maintain the stability of the structure during the charging and discharging process of the battery monomer 6, and reduces the risk of damage caused by vibration or impact. In addition, the heat absorption efficiency of the phase change heat absorption piece 602 is improved, the temperature rise speed of the adapter sheet 601 is reduced, and thus the fast charging performance of the battery monomer 6 is improved.

[0125] In some embodiments of the present application, the phase change heat sink 602 includes at least one of a paraffin-polyolefin composite heat sink, a paraffin- elastomer composite heat sink, a paraffin-porous ceramic composite heat sink, a fatty acid-polyolefin composite heat sink, and a hydrated salt-ceramic composite heat sink.

[0126] The paraffin-polyolefin composite heat sink is prepared by mixing paraffin and polyolefin. Paraffin is a white or yellow block solid material processed from petroleum, which has the characteristics of phase change heat absorption. Polyolefin is a kind of olefin polymer, such as polyethylene and polypropylene, which has good physical and chemical properties. The paraffin-polyolefin composite heat sink has the phase change heat absorption characteristics of paraffin, and at the same time has the processability and high structural strength of polyolefin.

[0127] The paraffin-polyolefin composite heat sink is prepared by mixing paraffin and polyolefin. Paraffin is a white or yellow block solid material processed from petroleum, which has the characteristics of phase change heat absorption. Polyolefin is a kind of olefin polymer, such as polyethylene and polypropylene, which has good physical and chemical properties. The paraffin-polyolefin composite heat sink has the phase change heat absorption characteristics of paraffin, and at the same time has the processability and high structural strength of polyolefin.

[0128] The paraffin-polyolefin composite heat sink is prepared by mixing paraffin and polyolefin. Paraffin is a white or yellow block solid material processed from petroleum, which has the characteristics of phase change heat absorption. Polyolefin is a kind of olefin polymer, such as polyethylene and polypropylene, which has good physical and chemical properties. The paraffin-polyolefin composite heat sink has the phase change heat absorption characteristics of paraffin, and at the same time has the processability and high structural strength of polyolefin.

[0129] The fatty acid-polyolefin composite heat sink uses fatty acid as a natural phase change material, which has the advantages of environmental friendliness and renewability. Polyolefin as a polymer matrix can provide good processing performance and mechanical strength. This composite material combines the phase change characteristics of fatty acid and the practicality of polyolefin, and is suitable for various applications of battery cells 6.

[0130] The hydrated salt-ceramic composite heat sink uses hydrated salt as a phase change material, which has a high latent heat value and a low cost. Ceramic as a supporting material can improve the thermal stability and chemical stability of the composite material. This composite material can effectively absorb and store heat in the battery cell 6 while maintaining the stability and integrity of the structure.

[0131] The above-mentioned composite heat sink can reduce the influence on other components of the battery cell 6 while reducing the temperature reduction speed of the battery cell 6, and can ensure the stability of the battery cell 6 during operation.

[0132] In some embodiments of the present application, the phase change heat sink 602 has a cavity, and the adapter piece 601 is arranged in the cavity.

[0133] The cavity design allows the phase change heat absorber 602 to be more tightly wrapped around the adapter plate 601. In this way, the phase change material can more efficiently absorb and store the heat generated by the adapter plate 601, reduce temperature fluctuations, and improve the fast charging performance of the battery cell 6.

[0134] Furthermore, a cavity is provided in the phase change heat absorber 602 to limit the position of the adapter 601, thereby improving the connection stability between the adapter and the electrode terminal 50 and the tab 101.

[0135] like Figure 6 As shown, in some embodiments of this application, the phase change heat absorber 602 includes a first wall 603, a second wall 604, and a side wall 605. The first wall 603 is disposed facing the outer casing 20, and has a first through hole 606 for connecting the adapter piece 601 and the electrode terminal 50. The second wall 604 is disposed opposite to the first wall 603, and faces the electrode assembly 10. The second wall 604 has a second through hole 610 for connecting the adapter piece 601 and the electrode tab 101. The side wall 605 is connected to the first wall 603 and the second wall 604. The first wall 603, the second wall 604, and the side wall 605 together enclose a cavity.

[0136] By increasing the contact area between the phase change heat absorber 602 and the adapter 601 and optimizing the heat transfer path, the fast-charging performance of the battery cell is improved, and it also helps maintain the battery cell 6 within a suitable operating temperature range. The cavity design provides stable positioning and support for the adapter 601, reducing the risk of connection loosening or failure due to vibration or external forces. Effective thermal management can reduce the risk of overheating of the adapter 601, thereby improving the fast-charging performance and operational safety of the battery cell 6. The through-hole design makes the connection between the adapter 601 and the electrode assembly 10 and the electrode terminal 50 more intuitive and convenient, helping to reduce production costs and improve production efficiency.

[0137] In the above structure, multiple walls enclose a cavity, which, while accommodating the adapter plate 601, maximizes the contact area between the phase change heat absorber 602 and the adapter plate 601, improving heat exchange efficiency and reducing heat accumulation on the adapter plate 601. Furthermore, through holes are provided in the first wall 603 and the second wall 604 to facilitate electrical connection between the adapter plate 601 and the electrode assembly 10 and the electrode terminal 50, improving the ease of assembly of the adapter assembly 60.

[0138] like Figure 5As shown, in some embodiments of the present application, the adapter plate 601 includes a body 607 and a pole connecting portion 608. The body 607 is arranged between the shell 20 and the electrode assembly 10, and the pole connecting portion 608 is arranged on the body 607, at least part of the pole connecting portion 608 corresponding to the first through hole 606.

[0139] Optionally, the body 607 is a plate-shaped structure made of a metal material with certain strength. The body 607 is the main part of the adapter plate 601, located between the shell 20 and the electrode assembly 10, and plays a supporting and conductive role.

[0140] Optionally, the thickness of the pole connecting portion 608 is smaller than the thickness of other regions of the body 607 to meet the thickness requirements of the welding process.

[0141] The pole connecting portion 608 can be cylindrical, and the pole connecting portion 608 is connected to the body 607 and protrudes from one side of the body 607 towards the shell 20. Optionally, the pole connecting portion 608 and the body 607 are an integral structure. This design not only increases the contact area of the adapter plate 601 and the electrode terminal 50, but also makes the connection more firm and stable. The pole connecting portion 608 passes through the first through hole 606 on the first wall 603 of the phase change heat sink 602. The pole connecting portion 608 establishes an electrical connection with the electrode terminal 50 by passing through the first through hole 606 on the first wall 603 of the phase change heat sink 602. This design not only ensures the reliability of the electrical connection, but also allows the phase change heat sink 602 to provide effective thermal isolation and heat absorption between the adapter plate 601 and the electrode terminal 50.

[0142] The design of the pole connecting portion 608 protruding from the body 607 significantly increases the contact area with the electrode terminal 50. This not only improves the mechanical strength of the connection, but also helps to reduce the contact resistance, thereby improving the efficiency of current conduction.

[0143] The larger contact area and more secure connection method make the connection between the adapter plate 601 and the electrode terminal 50 more stable and less likely to loosen due to vibration or temperature changes. This helps to maintain the stability of the current within the battery and prolong the service life of the battery.

[0144] The phase change heat sink 602 is located between the adapter plate 601 and the electrode terminal 50, which can absorb and store the heat generated by current conduction. At the same time, it reduces the risk of heat being transmitted to the external structure through the end cover 30. At the same time, it is easier to achieve precise alignment and connection between the adapter plate 601 and the electrode terminal 50, thereby simplifying the assembly process of the battery monomer 6.

[0145] In some embodiments of the present application, the body 607 further comprises a welding area 609 for connecting the tab 101, the welding area 609 corresponding to the second through hole 610, the body 607 being arranged on one side of the electrode assembly 10 along the first direction X, the welding area 609 and the tab connecting portion 608 being arranged on the body 607 along the second direction Y, the first direction X being perpendicular to the second direction Y.

[0146] Exemplarily, the first direction X is the thickness direction of the end cover 30, and the second direction Y is the width direction of the end cover 30.

[0147] Alternatively, the welding area 609 is a rough area formed on the surface of the body 607, which improves the welding connection strength and stability. The welding area 609 improves the strength and stability of the connection between the tab 101 and the adapter plate 601. Moreover, the design of the second through hole 610 allows the tab 101 to pass through the phase change heat sink 602 and be welded to the welding area 609 of the adapter plate 601, thereby improving the assembly efficiency of the adapter assembly 60. At the same time, due to the corresponding relationship between the welding area 609 and the second through hole 610, the difficulty of alignment and positioning during assembly is also reduced.

[0148] In the above structure, the welding area 609 improves the strength and stability of the connection between the tab 101 and the adapter plate 601, the second through hole 610 facilitates the welding connection between the adapter and the tab 101, and the assembly efficiency of the adapter assembly 60 is improved.

[0149] In some embodiments of the present application, the welding area 609 protrudes from the side surface of the body 607 towards the electrode assembly 10. Exemplarily, the shape of the tab 101 is rectangular or square, and correspondingly, the third through hole is rectangular or square in cross section, matching the shape of the tab 101.

[0150] By protruding the welding area 609, the welding connection area of the tab 101 is increased, and the increased welding connection area also means that the current passing area through the adapter plate 601 and the tab 101 is increased. This helps to reduce the current density, reduce heat accumulation, and improve the thermal stability and safety of the battery.

[0151] The larger welding connection area means stronger mechanical connection and lower contact resistance. This helps to improve the connection stability between the tab 101 and the adapter piece 601, reducing the risk of connection loosening or failure due to vibration or temperature change. The increased overcurrent area helps to reduce the resistance and heat accumulation when current passes through, thereby improving the overcurrent capacity and overall performance of the battery. This is particularly important for application scenarios that require high power output. The larger welding connection area and overcurrent area also mean better heat conduction paths. This helps to more effectively transfer the heat generated inside the battery to the phase change heat sink 602 or other heat dissipation structures, thereby improving the thermal management efficiency of the battery.

[0152] In some embodiments of the present application, the number of welding areas 609 is two, and the two welding areas 609 are oppositely arranged along the third direction Z with respect to the body 607. The second through hole 610 is correspondingly provided with two. Optionally, the number of third through holes is correspondingly provided with two. For example, the third direction Z is the width direction of the end cover 30, or the third direction Z is the thickness direction of the battery monomer 6.

[0153] More welding areas 609 mean stronger mechanical connection and lower contact resistance. This helps to improve the connection stability between the tab 101 and the adapter piece 601, reducing the risk of connection loosening or failure due to vibration, temperature change or current impact. The increased overcurrent area helps to reduce the resistance and heat accumulation when current passes through, thereby improving the overcurrent capacity and overall performance of the battery. This is particularly important for application scenarios that require high power output. The larger welding connection area and overcurrent area also mean better heat conduction paths. This helps to more effectively transfer the heat generated inside the battery to the phase change heat sink 602 or other heat dissipation structures, thereby improving the thermal management efficiency of the battery.

[0154] The two welding areas 609 are oppositely arranged along the third direction Z, which helps to ensure uniform distribution of current on the adapter piece 601, reducing the risk of local overheating and uneven current.

[0155] In the above structure, by increasing the number of welding areas 609, the area of the tab 101 welding connection is increased, the overcurrent area is increased, and the connection stability of the tab 101 and the adapter piece 601 is improved.

[0156] In some embodiments of the present application, the phase change heat sink 602 is provided with a first opening 611 at one end along the second direction Y, and the opening is used to install the adapter piece 601. The first opening 611 is in communication with the cavity.

[0157] Optionally, for the case that the width of the adapter piece 601 is relatively uniform and the phase change heat sink 602 has a certain elasticity, the adapter piece 601 can be assembled into the phase change heat sink 602 through the opening.

[0158] Clear assembly paths and positioning points help reduce errors during assembly. This ensures consistency and reliability of each battery assembly, improving overall product quality. The design of the openings can be combined with automated assembly equipment to further optimize production processes. This helps achieve more efficient and precise assembly operations, improving the overall efficiency of the production line.

[0159] In the above structure, by setting the opening, the adapter piece 601 is easily loaded into the phase change heat sink 602 from the opening, improving the efficiency of assembly.

[0160] As Figure 7 shown, in some embodiments of the present application, the phase change heat sink 602 includes a first sleeve 612 and a second sleeve 613 arranged along the second direction Y, the first sleeve 612 is provided with a second opening 614, and the second sleeve 613 is provided with a third opening 615.

[0161] The width of the adapter piece 601 can vary at different locations. For example, in some areas, the width can be increased to accommodate more current or enhance mechanical strength. In other areas, the width can be reduced to save space or reduce weight.

[0162] Alternatively, for cases where the adapter piece 601 has different sizes in the width direction, the phase change heat sink material can be arranged in the form of two sleeves. For example, two opposite openings are provided on the first sleeve 612 and the second sleeve 613, and the first sleeve 612 and the second sleeve 613 are respectively sleeved into the opposite ends of the adapter piece 601 to achieve the assembly of the adapter piece 601 into the phase change heat sink 602. In the above structure, the phase change heat sink 602 is divided into two sleeves, improving the efficiency and convenience of the phase change heat sink 602 installation.

[0163] In some embodiments of the present application, the shell 20 includes an end cover 30 arranged along the first direction X and a housing 40, the electrode terminal 50 is arranged on the end cover 30, and the electrode assembly 10 is arranged in the housing 40. The end cover 30 is provided with a receiving groove 301 recessed in the first direction X on the side surface facing the electrode assembly 10, and at least part of the welding area 609 is arranged in the receiving groove 301.

[0164] As Figure 8As shown, the end cap 30 has a recessed receiving groove 301 along the first direction X on its surface facing the electrode assembly 10. This design not only provides additional receiving space for the tab 101, but also helps to optimize the internal structural layout of the battery cell 6. At least a portion of the welding area 609 is located within the receiving groove 301. This arrangement not only ensures a reliable connection between the tab 101 and the adapter piece 601, but also helps to improve the overall structural strength of the battery cell 6. The tab 101 and the electrode terminal 50 are arranged along the second direction Y. This layout makes full use of the space of the end cap 30 along the second direction Y, avoids unnecessary space waste, and improves space utilization.

[0165] By setting up the receiving slot 301 and rationally arranging the welding area 609, the internal structure of the battery cell 6 is optimized, and the space utilization rate is significantly improved. This helps to increase the capacity of the electrode assembly 10 while keeping the volume of the battery cell 6 unchanged, thereby improving the energy density. Due to the improved space utilization rate, the battery cell 6 can accommodate more electrode material, thereby increasing the energy storage capacity. This helps to extend the battery's service life and improve its performance.

[0166] The welding area 609 is located within the receiving groove 301, which improves the reliable connection between the tab 101 and the adapter piece 601, and also enhances the overall structural strength of the battery cell 6. This helps to improve the impact resistance and durability of the battery cell 6. In the above structure, by setting the receiving groove 301, the receiving space of the tab 101 is increased, and the tab 101 and the electrode terminal 50 are arranged along the second direction Y, making full use of the space of the end cover 30 along the second direction Y, improving the space utilization rate of the casing 20, thereby increasing the energy density of the battery cell 6.

[0167] like Figure 9 as well as Figure 10 As shown, in some optional embodiments, a protrusion 302 is formed on the side of the end cap 30 facing away from the electrode assembly 10, along the first direction X, extending beyond other positions of the end cap 30. A groove is formed on the side of the end cap 30 facing away from the receiving groove 301, corresponding to the protrusion; this groove is the receiving groove 301 mentioned above. The electrode terminal 50 is disposed within the groove, and the end of the electrode terminal 50 facing away from the end cap 30 is not higher than the surface of the protrusion 302. For example, the end of the electrode terminal 50 facing away from the end cap 30 is flush with the surface of the protrusion 302.

[0168] The end cover 30 protrudes at a position corresponding to the accommodating groove 301 in the first direction X on the side surface away from the electrode assembly 10, forming a protruding part 302. This design not only enhances the structural strength of the end cover 30, but also provides additional installation space for the phase change heat sink 602. On the side surface of the end cover 30 away from the accommodating groove 301, a recess is formed relative to the protruding part 302. This recess design cleverly utilizes the space on the outside of the end cover 30, providing convenience for the installation of the electrode terminal 50.

[0169] Through the design of the protruding part 302 and the recess, the space on the outside of the end cover 30 is reasonably utilized. This not only provides installation space for the heat dissipation assembly, but also helps to optimize the internal structural layout of the battery monomer 6. The design of the protruding part 302 helps to increase the heat dissipation area and improve the heat dissipation efficiency of the phase change heat sink 602 or other heat dissipation assemblies. This is of great significance to ensure the stable operation of the battery monomer 6 in high temperature environment. The design of the electrode terminal 50 flush with the surface of the protruding part 302 not only improves the aesthetics of the battery monomer 6, but also helps to enhance the overall structural strength. This helps to improve the impact resistance and durability of the battery monomer 6. The design of the recess provides convenience for the installation of the electrode terminal 50, and also facilitates subsequent maintenance and replacement work. This helps to reduce the maintenance cost and difficulty of use of the battery monomer 6.

[0170] The above structure reasonably utilizes the space on the outside of the end cover 30 and improves the heat dissipation efficiency of the phase change heat sink 602.

[0171] As shown in Figures 11 to 13 In some embodiments of the present application, the adapter sheet 601 includes a first part 616 and a second part 617 connected in sequence along a second direction Y, the first direction X is perpendicular to the second direction Y, the pole connecting part 608 is arranged on the first part 616, the welding area 609 is arranged on the second part 617, the first part 616 and the second part 617 are connected through a third part 618, and the first part 616 and the second part 617 are arranged on the two sides of the third part 618 along the first direction X.

[0172] The adapter sheet 601 includes a first part 616 and a second part 617 connected in sequence along a second direction Y, which fully utilizes the space of the end cover 30 in the second direction Y, thereby improving the space utilization. The first direction X is perpendicular to the second direction Y, which makes the adapter sheet 601 have better layout flexibility in three-dimensional space and better adapt to the internal structure of the battery monomer 6. The first part 616 and the second part 617 are connected through the third part 618, which not only enhances the overall structural strength of the adapter sheet 601, but also provides more possibilities for the connection between the adapter sheet 601 and the end cover 30.

[0173] The second part 617 is staggered along the first direction X relative to the first part 616, forming a relatively bent structure. This design allows the adapter tab 601 to better adapt to the structure of the accommodation groove 301 of the end cover 30, thereby improving the fit between the adapter tab 601 and the end cover 30 and the electrode assembly 10. For example, the longitudinal section of the adapter tab 601 forms a Z-shaped structure.

[0174] By arranging the first part 616 and the second part 617 along the second direction Y and connecting them through the third part 618, the design of the adapter tab 601 makes full use of the space of the end cover 30, thereby improving the space utilization of the entire battery monomer 6. The bent structure of the second part 617 staggered along the first direction X relative to the first part 616 allows the adapter tab 601 to better fit the accommodation groove 301 of the end cover 30, enhancing the connection stability between the adapter tab 601 and the end cover 30 and the electrode assembly 10. This helps to improve the stability of the battery monomer 6 during charging and discharging, reducing performance degradation or failure caused by poor connection.

[0175] Due to the improved fit and connection stability between the adapter tab 601 and the end cover 30 and the electrode assembly 10, the battery monomer 6 can maintain more stable performance during operation. This helps to prolong the service life of the battery monomer 6 and improve the energy density and safety of the battery monomer 6. This design also makes the installation and maintenance of the adapter tab 601 more convenient. Since the connection between the adapter tab 601 and the end cover 30 is tighter and more stable, it can reduce failures and problems caused by poor connection during installation and maintenance.

[0176] In the above structure, the first part 616 and the second part 617 of the adapter tab 601 are arranged along the second direction Y, making full use of the space of the end cover 30 along the second direction Y and improving the space utilization. Moreover, the second part 617 is staggered along the first direction X relative to the first part 616 to form a relatively bent structure, which adapts to the structure of the accommodation groove 301 of the end cover 30, improves the fit between the adapter tab and the end cover 30 and the electrode assembly 10, and improves the connection stability between the adapter tab and the electrode terminal 50 and the tab 101, thereby improving the stability of the battery monomer 6 during operation.

[0177] As shown in Figure 12 and Figure 13 In some embodiments of the present application, the phase change heat sink 602 includes a first heat sink 619 corresponding to the first part 616, a second heat sink 620 corresponding to the second part 617, and a third heat sink 621 corresponding to the third part 618. The first heat sink 619 is provided with a first through hole 606, and the second heat sink 620 is provided with a second through hole 610. The first through hole 606 is arranged corresponding to the pole connecting part 608, and the second through hole 610 is arranged corresponding to the welding area 609.

[0178] In some optional embodiments, the electrode assembly 10, the shell 20 and the adapter assembly 60 are included. The electrode assembly 10 includes the tab 101, and the shell 20 includes the electrode terminal 50. The adapter assembly 60 includes the adapter sheet 601 and the phase change heat sink 602. The adapter sheet 601 is used to electrically connect the tab 101 and the electrode terminal 50. The phase change heat sink 602 covers at least part of the surface of the adapter sheet 601. The phase change heat sink 602 includes a phase change material used for heat exchange with the adapter sheet 601. The phase change heat sink 602 has a cavity therein, and the adapter sheet 601 is arranged in the cavity. The phase change heat sink 602 includes the first wall 603, the second wall 604 and the side wall 605. The first wall 603 is arranged towards the shell 20, and the first wall 603 is provided with the first through hole 606 to connect the adapter sheet 601 and the electrode terminal 50. The second wall 604 is arranged opposite to the first wall 603, and the second wall 604 is arranged towards the electrode assembly 10. The second wall 604 is provided with the second through hole 610 to connect the adapter sheet 601 and the tab 101. The side wall 605 is connected to the first wall 603 and the second wall 604. The first wall 603, the second wall 604 and the side wall 605 together enclose the cavity. The adapter sheet 601 includes the body 607 and the pole connecting part 608. The body 607 is arranged between the shell 20 and the electrode assembly 10. The pole connecting part 608 protrudes from one side of the body 607 towards the shell 20, and the pole connecting part 608 passes through the first through hole 606 to connect the electrode terminal 50. The body 607 is further provided with the welding area 609 used for connecting the tab 101. The welding area 609 is arranged corresponding to the second through hole 610. The body 607 is arranged on one side of the electrode assembly 10 along the first direction X. The pole connecting part 608 and the welding area 609 are arranged on the body 607 along the second direction Y and are spaced apart. The first direction X and the second direction Y are perpendicular to each other. The number of the welding area 609 is two. The two welding areas 609 are arranged opposite to each other on the body 607 along the third direction Z. The second through hole 610 is arranged corresponding to the two welding areas 609. The phase change heat sink 602 includes the first sleeve 612 and the second sleeve 613 arranged along the second direction Y. The first sleeve 612 and the second sleeve 613 are respectively provided with at least one opening. The shell 20 includes the end cover 30 and the shell body 40 arranged along the first direction X. The electrode terminal 50 is arranged on the end cover 30, and the electrode assembly 10 is arranged in the shell body 40. The end cover 30 is provided with the accommodating groove 301 recessed inwards along the first direction X on the side surface thereof facing the electrode assembly 10. At least part of the welding area 609 is arranged in the accommodating groove 301. The adapter sheet 601 includes the first part 616 and the second part 617 connected in sequence along the second direction Y. The pole connecting part 608 is arranged on the first part 616, and the welding area 609 is arranged on the second part 617. The first part 616 and the second part 617 are connected through the third part 618, and the first part 616 and the second part 617 are arranged on opposite sides of the third part 618 along the first direction X.

[0179] The embodiments of the present application provide a battery device 2 comprising the battery cell 6 in the above embodiments. The embodiments of the present application also provide an electrical equipment comprising the battery device 2 in the above embodiments, and the battery device 2 is used to provide electrical energy. The battery device 2 and the electrical equipment both comprise the battery cell 6 in the above embodiments, and the electrode assembly 10 in the battery cell 6 is the main part for converting electrical energy and chemical energy, and the tab 101 in the electrode assembly 10 is used to transmit electrical energy of the main part of the electrode assembly 10 to the outside. The shell 20 is arranged to provide a stable environment for the electrode assembly 10, so as to reduce damage of impurities or moisture in the outside to the electrode assembly 10. The adapter piece 601 of the adapter assembly 60 is electrically connected to the electrode terminal 50 and the tab 101, so as to transmit electrical energy of the electrode assembly 10. The adapter piece 601 is connected between the electrode terminal 50 and the tab 101, and is used to transmit electrical energy of the electrode assembly 10. In addition, the phase change heat absorption member 602 in the adapter assembly 60 is in contact with the adapter piece 601 and absorbs heat on the adapter piece 601, so as to reduce heat accumulation on the adapter piece 601, improve the overcurrent capacity of the adapter piece 601, and thus improve the rapid charging performance of the battery cell 6 and improve the stability of the battery cell 6 during operation.

[0180] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application without departing from the scope of the present application, and equivalent components can be substituted for the components in the present application, and in particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed in the present application, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: Electrode assembly, including tabs; Housing, including electrode terminals; An adapter assembly includes an adapter plate and a phase change heat absorber. The adapter plate is used to electrically connect the tab and the electrode terminal. The phase change heat absorber covers at least a portion of the surface of the adapter plate. The phase change heat absorber includes a phase change material for exchanging heat with the adapter plate.

2. The battery cell according to claim 1, characterized in that, The adapter plate and the phase change heat absorber are formed by injection molding.

3. The battery cell according to claim 1, characterized in that, The phase change heat absorber includes at least one of the following: paraffin-polyolefin composite heat absorber, paraffin-elastomer composite heat absorber, paraffin-porous ceramic composite heat absorber, fatty acid-polyolefin composite heat absorber, and hydrated salt-ceramic composite heat absorber.

4. The battery cell according to any one of claims 1-3, characterized in that, The phase change heat absorber has a cavity, and the adapter plate is disposed in the cavity.

5. The battery cell according to claim 4, characterized in that, The phase change heat absorber includes: A first wall is disposed facing the outer casing, and a first through hole is provided on the first wall to connect the adapter piece and the electrode terminal; The second wall is disposed opposite to the first wall and faces the electrode assembly. The second wall is provided with a second through hole to connect the adapter piece and the electrode tab. Sidewall, connected to the first wall and the second wall, The cavity is formed by the first wall, the second wall, and the side wall together.

6. The battery cell according to claim 5, characterized in that, The adapter plate includes: The main body is disposed between the outer casing and the electrode assembly; An electrode connection portion is provided on the body, and at least a portion of the electrode connection portion is provided corresponding to the first through hole.

7. The battery cell according to claim 6, characterized in that, The body is also provided with a welding area for connecting the electrode tab. The welding area is provided corresponding to the second through hole. The body is provided on one side of the electrode assembly along the first direction. The electrode post connection and the welding area are spaced apart on the body along the second direction. The first direction and the second direction are perpendicular to each other.

8. The battery cell according to claim 7, characterized in that, The welding area protrudes from the side surface of the body facing the electrode assembly.

9. The battery cell according to claim 8, characterized in that, The number of welding zones is two, and the two welding zones are arranged opposite each other in a third direction on the body, and the second through hole is correspondingly set to two.

10. The battery cell according to claim 7, characterized in that, The phase change heat absorber has a first opening at one end along the second direction, and the first opening is used to install the adapter plate.

11. The battery cell according to claim 10, characterized in that, The phase change heat absorption element includes a first sleeve and a second sleeve arranged along the second direction. The first sleeve has a second opening, and the second sleeve has a third opening.

12. The battery cell according to any one of claims 7-11, characterized in that, The housing includes an end cap and a housing arranged along a first direction. The electrode terminal is disposed on the end cap, and the electrode assembly is disposed inside the housing. The surface of the end cap facing the electrode assembly is provided with a receiving groove that is recessed in the first direction. At least a portion of the welding area is disposed in the receiving groove.

13. The battery cell according to claim 12, characterized in that, The adapter plate includes a first part and a second part connected sequentially along a second direction, the first direction being perpendicular to the second direction. The pole connection portion is located in the first part, the welding area is located in the second part, and the first part and the second part are connected by a third part, which is located on opposite sides of the third part along the first direction.

14. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-13.

15. An electrical appliance, characterized in that, The electrical equipment includes the battery device as described in claim 14, the battery device being used to provide electrical energy.

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