Battery cell, battery device and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, an electrode terminal and an insulating part, the shell comprises a first wall, the first wall is provided with an electrode lead-out hole, and an accommodating cavity is formed in the shell; the electrode terminal is arranged on the first wall, and the electrode terminal and the electrode lead-out hole are oppositely arranged; an insulating member provided on the first wall and surrounding the outer periphery of the electrode terminal; wherein one of the insulating component and the electrode terminal is provided with a protruding structure, the other one of the insulating component and the electrode terminal is provided with a groove structure, and at least part of the protruding structure is contained in the groove structure. Based on the embodiment of the invention, the use performance of the battery monomer can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, more particularly, to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the development of battery technology, in addition to improving the electrical performance of the battery device, structural stability and safety performance are also a problem that cannot be ignored. If the structural stability and safety performance of the battery monomer in the battery device cannot be guaranteed, the battery device cannot be used normally, which reduces the use performance of the battery device. Therefore, how to improve the use performance of the battery monomer has become a technical problem to be solved in the field. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery monomer, a battery device and a power utilization device, which can improve the use performance of the battery monomer.

[0005] In a first aspect, the present application provides a battery monomer, which comprises a shell, an electrode terminal and an insulating component, wherein the shell comprises a first wall, the first wall is provided with an electrode lead-out hole, and an accommodating cavity is formed inside the shell; the electrode terminal is arranged on the first wall, and the electrode terminal is arranged opposite to the electrode lead-out hole; the insulating component is arranged on the first wall and surrounds the outer periphery of the electrode terminal; wherein one of the insulating component and the electrode terminal is provided with a protruding structure, the other of the insulating component and the electrode terminal is provided with a groove structure, and at least part of the protruding structure is accommodated in the groove structure.

[0006] In the scheme of the embodiments of the present application, when the electrode terminal is subjected to external torsional force or bending force, at least part of the protruding structure is accommodated in the groove structure, which can effectively disperse stress to the whole structure, reduce the risk of deformation or fracture caused by local stress concentration, and further improve the overall structural stability of the electrode terminal; secondly, by accommodating at least part of the protruding structure in the groove structure, the electrode terminal can still maintain stable structural performance when subjected to internal pressure changes of the battery monomer, thereby reducing the risk of short circuit caused by deformation of the electrode terminal; in addition, the sealing performance between the electrode terminal and the first wall can also be improved, so as to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the insulating component and the electrode terminal under different use conditions, thereby improving the use performance of the battery monomer.

[0007] In some embodiments, all of the protruding structures are accommodated in the groove structure.

[0008] In the scheme of the embodiment of the present application, by setting all the protruding structures in the groove structure, the risk of deformation or fracture caused by local stress concentration is further reduced, and the overall structural stability of the electrode terminal is further improved. Secondly, by setting all the protruding structures in the groove structure, the electrode terminal can still maintain stable structural performance when the electrode terminal is subjected to internal pressure changes of the battery monomer, thereby reducing the risk of short circuit caused by deformation of the electrode terminal. In addition, by setting all the protruding structures in the groove structure, the sealing performance between the electrode terminal and the first wall is further improved, so as to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the insulating part and the electrode terminal in different use conditions, thereby improving the use performance of the battery monomer.

[0009] In some embodiments, the insulating part includes a first portion disposed between the first wall and the electrode terminal, the first portion includes a first surface facing the electrode terminal, the protruding structure includes a first protrusion extending from the first surface toward the electrode terminal, and the groove structure includes a first groove formed on the electrode terminal, and at least part of the first protrusion is accommodated in the first groove.

[0010] In the scheme of the embodiment of the present application, by setting the first protrusion on the first surface of the first portion and forming the first groove on the electrode terminal, at least part of the first protrusion is accommodated in the first groove, so as to take into account the structural stability and safety performance of the battery monomer, while also taking into account the sealing performance of the battery monomer, thereby improving the use performance of the battery monomer.

[0011] In some embodiments, along the thickness direction of the first wall, the size D1 of the first groove and the size D2 between the first surface of the electrode terminal and the second surface of the electrode terminal satisfy: 1.2≤D2 / D1≤4; wherein the first surface is the surface of the electrode terminal close to the accommodation cavity, and the second surface is the surface of the electrode terminal with the smallest distance from the first surface in the thickness direction of the first wall.

[0012] In the scheme of the embodiment of the present application, the ratio between the size D2 of the first groove and the size D1 between the first surface of the electrode terminal and the second surface of the electrode terminal is set within the range, which can reduce the risk of deformation or fracture caused by local stress concentration, thereby further improving the overall structural stability of the electrode terminal. On the other hand, the rigidity of the electrode terminal can be improved to reduce the risk of deformation of the electrode terminal, thereby further improving the structural stability of the battery monomer.

[0013] In some embodiments, the insulating part includes a second portion arranged on the electrode terminal, the second portion includes a second surface perpendicular to the thickness direction of the first wall and facing the electrode terminal, the protruding structure includes a second protrusion extending from the second surface toward the electrode terminal, and the groove structure includes a second groove formed on the electrode terminal, and at least part of the second protrusion is accommodated in the second groove.

[0014] In the scheme of the embodiment of the application, the second protrusion is arranged on the second surface of the second part of the insulating component, the second groove is arranged on the electrode terminal, and at least part of the second protrusion is accommodated in the second groove, so that the structural stability and safety performance of the battery monomer are considered, the sealing performance of the battery monomer is also considered, and the use performance of the battery monomer is improved.

[0015] In some embodiments, along the thickness direction of the first wall, the distance D3 between the first groove and the second groove and the size D2 between the first surface and the second surface of the electrode terminal satisfy: 0.25≤D3 / D2≤0.8.

[0016] In the scheme of the embodiment of the application, the ratio of the distance D3 between the first groove and the second groove and the size D2 between the first surface and the second surface of the electrode terminal is arranged in the range, on the one hand, the risk of deformation or fracture caused by local stress concentration can be reduced, and the structural stability of the electrode terminal as a whole is further improved; on the other hand, the rigidity of the electrode terminal can be improved, the risk of deformation of the electrode terminal is reduced, and the structural stability of the battery monomer is further improved.

[0017] In some embodiments, the insulating component includes a third part arranged on the first wall, the third part includes a third surface facing the electrode terminal, the protrusion structure includes a third protrusion extending from the third surface towards the electrode terminal, the groove structure includes a third groove formed on the electrode terminal, and at least part of the third protrusion is accommodated in the third groove.

[0018] In the scheme of the embodiment of the application, the third protrusion is arranged on the third surface of the third part of the insulating component, the third groove is arranged on the electrode terminal, and at least part of the third protrusion is accommodated in the third groove, so that the structural stability and safety performance of the battery monomer are considered, the sealing performance of the battery monomer is also considered, and the use performance of the battery monomer is improved.

[0019] In some embodiments, the bottom wall of the insulating component extends towards the first wall to form a fourth protrusion, and the surface of the first wall facing the insulating component side is formed with a fourth groove, and at least part of the fourth protrusion is accommodated in the fourth groove.

[0020] In the scheme of the embodiment of the application, the bottom wall of the insulating component extends towards the first wall to form a fourth protrusion, and the surface of the first wall facing the insulating component side is formed with a fourth groove, and at least part of the fourth protrusion is accommodated in the fourth groove, so that the structural stability and safety performance of the battery monomer are considered, the sealing performance of the battery monomer is also considered, and the use performance of the battery monomer is improved.

[0021] In some embodiments, the insulating component includes a first portion disposed between the first wall and the electrode terminal, the first portion including a first surface facing the electrode terminal, the protrusion structure includes a fifth protrusion extending from the electrode terminal towards the first surface, and the groove structure includes a fifth groove formed in the first surface, and at least part of the fifth protrusion is accommodated in the fifth groove.

[0022] In the scheme of the embodiments of the present application, by accommodating at least part of the fifth protrusion in the fifth groove, the structural stability and safety performance of the battery monomer are taken into account, and at the same time, the sealing performance of the battery monomer is also taken into account, thereby improving the use performance of the battery monomer.

[0023] In some embodiments, the number of protrusion structures is set to be multiple, the number of groove structures is set to be multiple, and the multiple protrusion structures correspond to the multiple groove structures one by one.

[0024] In the scheme of the embodiments of the present application, by setting the number of protrusion structures to be multiple, the number of groove structures to be multiple, and the multiple protrusion structures to correspond to the multiple groove structures one by one, the stress can be effectively dispersed to the entire structure, the risk of deformation or fracture caused by local stress concentration is reduced, and the structural stability of the electrode terminal as a whole is improved. In addition, when the electrode terminal is subjected to the change of the internal gas pressure of the battery monomer, the stable structural performance can still be maintained, and the risk of short circuit caused by deformation of the electrode terminal is reduced. In addition, the sealing performance between the electrode terminal and the first wall can be improved, so as to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the insulating component and the electrode terminal in different use conditions, thereby improving the use performance of the battery monomer.

[0025] In a second aspect, a battery device is provided, including: a plurality of battery monomers, the battery monomers being the battery monomers in the first aspect or any of the implementation manners thereof.

[0026] In a third aspect, a power consuming device is provided, including the battery device in the second aspect, and the battery device is configured to provide electric energy for the power consuming device.

[0027] In some implementation manners, the power consuming device can be a vehicle, a ship, or a spacecraft, etc. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application.

[0030] Figure 2 is a structural schematic diagram of a battery device provided by an embodiment of the present application.

[0031] Figure 3 is a structural schematic diagram of a battery monomer provided by an embodiment of the present application.

[0032] Figure 4 is a structural schematic diagram of a battery monomer provided by another embodiment of the present application.

[0033] Figure 5 is a structural schematic diagram of a battery monomer provided by an embodiment of the present application.

[0034] Figure 6 is a structural schematic diagram of a battery monomer provided by an embodiment of the present application.

[0035] Figure 7 is a structural schematic diagram of a battery monomer provided by another embodiment of the present application.

[0036] Figure 8 is a structural schematic diagram of a battery monomer provided by another embodiment of the present application.

[0037] Figure 9 is a structural schematic diagram of a battery monomer provided by another embodiment of the present application.

[0038] Figure 10 is a structural schematic diagram of a battery monomer provided by another embodiment of the present application.

[0039] Figure 11 is a structural schematic diagram of a battery monomer provided by another embodiment of the present application.

[0040] Figure 12 is a structural schematic diagram of a battery monomer provided by another embodiment of the present application.

[0041] Explanation of Reference Numerals: 1 - vehicle; 10 - battery device; 20 - battery cell; 30 - controller; 40 - motor; 510 - opening; 11 - case; 111 - first member; 112 - second member; 112a - bottom plate; 112b - side plate; 21 - outer case; 22 - electrode assembly; 211 - case; 212 - end cap; 222 - electrode tab; 222a - positive electrode tab; 222b - negative electrode tab; 213 - pressure relief mechanism; 214 - electrode terminal; 214a - first electrode terminal; 214b - second electrode terminal; 215 - first wall; 216 - electrode lead-out hole; 23 - adapter member; 50 - accommodation cavity; 2143 - fixing portion; 60 - insulating member; 61 - first portion; 62 - second portion; 63 - third portion; 610 - first surface; 611 - second surface; 612 - third surface; 613 - fourth surface; 70 - groove structure; 710 - first groove; 720 - second groove; 730 - third groove; 740 - fourth groove; 750 - fifth groove; 760 - sixth groove; 80 - protrusion structure; 810 - first protrusion; 820 - second protrusion; 830 - third protrusion; 840 - fourth protrusion; 850 - fifth protrusion; 860 - sixth protrusion; 2140 - first face; 2141 - second face; 2142 - third face; 231 - bottom wall.

[0042] In the drawings, the drawings are not drawn according to the actual proportions. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] 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 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 of the present application and claims and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, rather than to describe a particular order or primary and secondary relationship.

[0045] Reference to an "embodiment" in this application 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 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 that the embodiments described in this application can be combined with each other in their various permutations and combinations.

[0046] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0047] 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 can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0048] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0049] "Multiple" appearing in this application means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0050] If not specifically stated, all embodiments and optional embodiments of the application can be combined with each other to form new technical solutions.

[0051] If not specifically stated, all technical features and optional technical features of the application can be combined with each other to form new technical solutions.

[0052] In the embodiments of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging the battery cell. The battery device in the embodiments of the application can also be referred to as a battery.

[0053] 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.

[0054] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through.

[0055] 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 disposed on at least one surface of the positive electrode current collector.

[0056] 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 disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0057] As an example, the positive electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, surface-treated metals, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. can be used. 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.).

[0058] In some embodiments, the positive electrode can be a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or a foam carbon, etc. When the foam metal is used as the positive electrode, the surface of the foam metal can not be provided with the positive electrode active material, of course, the positive electrode active material can also be provided. As an example, the positive electrode active material is filled or / and deposited in the foam metal.

[0059] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0060] As an example, the negative 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 (copper, copper 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.).

[0061] As an example, the negative electrode sheet can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0062] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0063] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. 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 active material for a battery cell can also be used. These negative active materials can be used alone only one or in combination of two or more.

[0064] 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 a negative electrode sheet, the surface of the foamed metal can not be provided with a negative active material, or of course, can be provided with a negative active material.

[0065] As an example, the negative active material can be filled or / and deposited in the negative current collector.

[0066] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0067] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0068] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0069] 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 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 layer, an organic particle coating layer, or an organic / inorganic composite coating layer can be applied to the surface of the separator film.

[0070] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0071] In some embodiments, the battery cell further includes 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.

[0072] The liquid electrolyte includes an electrolyte salt and a solvent.

[0073] In some embodiments, the electrolyte can optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, or an additive that improves certain properties of the battery cell, such as an additive that improves overcharge / fast charge performance, an additive that improves high-temperature performance, an additive that improves low-temperature performance, and the like.

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

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

[0076] As an example, the polymer of the polymer solid-state electrolyte can include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0077] 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 germanium phosphorus sulfide, argyrodite), amorphous sulfide), a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

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

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

[0080] In some embodiments, the electrode assembly is in 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 in 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 is folded to form a plurality of folded segments that are stacked.

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

[0085] As an example, a plurality of separators can be provided, each being disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0086] As an example, the separators can be continuously provided and disposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

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

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

[0089] In some embodiments, the battery cell can include a housing. The housing 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 housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate the electrode assembly and the electrolyte, etc.

[0090] 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, the prismatic battery cell including a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, etc., without particular limitation.

[0091] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected with the tab. The electrode terminal can be directly connected with the tab, or indirectly connected with the tab through a current collecting member. The electrode terminal can be provided on the end cap, or on the housing.

[0092] 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.

[0093] As an example, the pressure relief mechanism is actuated to release the internal pressure or temperature of the battery cell 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.

[0094] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0095] As an example, the pressure relief mechanism can also be provided separately from the housing and connected with the housing.

[0096] As mentioned in the present application, “actuation” 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 avoiding potential more serious accidents.

[0097] 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.

[0098] As mentioned in the present application, the exhaust from the battery cell 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 reaction, flame, etc.

[0099] 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 connection through a busbar component.

[0100] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0101] As an example, the battery cell assembly can be a battery module 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.

[0102] In some embodiments, the battery device can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0103] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box by fixing the battery module in the box.

[0104] 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.

[0105] 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 a closed space is formed inside the box to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0106] 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 a closed space is formed inside the box to accommodate the battery cell assembly.

[0107] 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.

[0108] 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, such as aircraft, rockets, space shuttles, and spacecraft.

[0109] The battery device in the embodiments of the present application can also be referred to as an energy storage device. The energy storage device includes one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery devices connected in series through a busbar component to improve the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device.

[0110] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. In the development of battery technology, in addition to improving the electrical performance of the battery device, structural stability and safety performance are also a problem that cannot be ignored. For example, an insulating component is usually provided between the electrode terminal of the battery monomer and the first wall for fixing the electrode terminal. During use, the electrode terminal needs to withstand continuous mechanical stress, which can easily cause the electrode terminal to bend and deform or even break. Such deformation not only causes the internal connection of the battery monomer to loosen, increasing the contact resistance, but also can cause short circuit, liquid leakage and other serious safety problems. Therefore, how to improve the use performance of the battery monomer has become a technical problem to be solved in the field.

[0111] Therefore, the embodiments of the present application provide a battery monomer, a battery device and a power utilization device. The battery monomer includes a shell, an electrode terminal and an insulating component. The shell includes a first wall provided with an electrode lead-out hole, and an accommodation cavity is formed inside the shell. The electrode terminal is arranged on the first wall and is arranged opposite the electrode lead-out hole. The insulating component is arranged on the first wall and surrounds the outer periphery of the electrode terminal. One of the insulating component and the electrode terminal is provided with a protruding structure, and the other of the insulating component and the electrode terminal is provided with a groove structure. At least part of the protruding structure is accommodated in the groove structure. In the scheme of the embodiments of the present application, when the electrode terminal is subjected to external torsional force or bending force, the stress can be effectively dispersed to the entire structure by at least part of the protruding structure being accommodated in the groove structure, reducing the risk of deformation or breakage caused by local stress concentration, thereby improving the overall structural stability of the electrode terminal. Secondly, by at least part of the protruding structure being accommodated in the groove structure, the electrode terminal can still maintain stable structural performance when subjected to internal pressure changes of the battery monomer, reducing the risk of short circuit caused by deformation of the electrode terminal. In addition, the sealing performance between the electrode terminal and the first wall can also be improved to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the insulating component and the electrode terminal under different use conditions, thereby improving the use performance of the battery monomer.

[0112] The technical solutions described in the embodiments of the present application are applicable to various power utilization devices using battery devices.

[0113] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0114] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of an electrical device.

[0115] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0116] To meet different power demands, the battery device 10 in this embodiment may include at least one battery cell assembly, which comprises multiple battery cells. These multiple battery cells can be electrically connected in series, parallel, or a combination thereof to form the battery device 10. A combination of series and parallel connections is used. The battery device 10 may also be referred to as a battery pack. For example, multiple battery cells can first be connected in series, parallel, or a combination to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form the battery device 10. That is, multiple battery cells can directly form the battery device 10, or they can first be assembled into battery modules, and then the battery modules can be assembled into the battery device 10.

[0117] For example, as shown in FIG. 1, a structural schematic diagram of a battery device 10 according to an embodiment of the present application can include a plurality of battery cells 20. The battery device 10 can further include a box 11 (or a cover) having a hollow structure inside which the plurality of battery cells 20 are accommodated. For example, the plurality of battery cells 20 can be arranged in parallel, in series, or in a combination of parallel and series connection in the box 11. Figure 2

[0118] As shown in FIG. 2, the box 11 can include two parts, which are referred to as a first part 111 and a second part 112, respectively, and the first part 111 and the second part 112 are buckled together. The shapes of the first part 111 and the second part 112 can be determined according to the shape of the combination of the plurality of battery cells 20, and the first part 111 and the second part 112 can each have an opening. For example, the first part 111 and the second part 112 can each be a hollow cuboid and have only one face as an opening face, the opening of the first part 111 and the opening of the second part 112 are oppositely arranged, and the first part 111 and the second part 112 are buckled together to form the box 11 having a closed cavity. The box can include a bottom plate 112a, a side plate 112b, and a beam. The plurality of battery cells 20 can be arranged in parallel, in series, or in a combination of parallel and series connection in the box 11 formed by buckling the first part 111 and the second part 112. Figure 2

[0119] Optionally, the battery device 10 can further include other structures, which will not be described herein. For example, the battery device 10 can further include a current collecting part for realizing the electrical connection between the plurality of battery cells 20, such as parallel connection, series connection, or a combination of parallel and series connection. Specifically, the current collecting part can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the current collecting part can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 can be further led out through the box by a conductive mechanism. Optionally, the conductive mechanism can also belong to the current collecting part.

[0120] According to different power requirements, the number of battery cells 20 can be set to any value. The plurality of battery cells 20 can be connected in series, in parallel, or in a combination of parallel and series connection to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery device 10 can be large, in order to facilitate installation, the battery cells 20 can be arranged in groups, and each group of battery cells 20 forms a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to requirements.

[0121] ​​In the embodiments of the present application, the number of battery monomers 20 can be set to any value according to different power requirements. The plurality of battery monomers 20 can be connected in series, in parallel, or in a mixed manner to achieve a larger capacity or power. Since the number of battery monomers 20 included in each battery device 10 can be large, in order to facilitate installation, the battery monomers 20 can be arranged in groups, and each group of battery monomers 20 forms a battery module. The number of battery monomers 20 included in the battery module is not limited and can be set according to requirements. The battery device 10 can include a plurality of battery modules, and the battery modules can be connected in series, in parallel, or in a mixed manner.

[0122] Figure 3 An exploded structural schematic diagram of the battery monomer 20 provided by an embodiment of the present application is shown, Figure 4 An exploded structural schematic diagram of the battery monomer 20 provided by another embodiment of the present application is shown. As Figure 3 and Figure 4 shown, the battery monomer 20 of the embodiment of the present application can include a shell 21 and an electrode assembly 22, the shell 21 has a closed containing cavity 50, and the electrode assembly 22 is arranged in the containing cavity 50 in the shell 21. The shell 21 can include a shell body 211 and an end cover 212, the shell body 211 is a hollow structure having at least one opening 510; the end cover 212 is used to mutually engage with the shell body 211 to form the shell 21 having the closed containing cavity 50.

[0123] In some embodiments, the end cover 212 can be a plate-shaped structure used to cover the opening 510 of the shell body 211. In other embodiments, the end cover 212 is similar in structure to the shell body 211, that is, both the shell body 211 and the end cover 212 are hollow structures having one opening 510, and the two openings 510 are butted to form the shell 21 having a closed containing space.

[0124] It should be understood that if the end cover 212 is a plate-shaped structure, the shell body 211 can be a hollow structure having one or more openings 510 at one end, for example, if the shell body 211 is a hollow structure having an opening 510 at one end, the end cover 212 can be provided as one; if the shell body 211 is a hollow structure having openings 510 at opposite ends, the end cover 212 can be provided as two, and the two end covers 212 cover the openings 510 at the two ends of the shell body 211, respectively.

[0125] The shell 21 can have various shapes, such as a cylinder, a cuboid, or other polyhedrons. Exemplarily, as Figure 3 and Figure 4 shown, in the embodiments of the present application, a cuboid structure of the shell 21 is mainly taken as an example for description.

[0126] It should be understood that the end cover 212 of the embodiments of the present application is used to cooperate with the shell 211 to isolate the internal environment of the battery monomer 20 from the external environment. The shape of the end cover 212 can be adapted to the shape of the shell 211, as shown in Figure 3 and Figure 4 The shell 211 is a cuboid structure, and the end cover 212 is a rectangular plate structure adapted to the shell 211.

[0127] The material of the shell 211 of the embodiments of the present application can include one or more, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cover 212 can also be one or more, such as copper, iron, aluminum, steel, aluminum alloy, etc. Among them, the material of the end cover 212 and the material of the shell 211 can be the same or different; the materials of the different walls of the shell 211 can also be the same or different.

[0128] The end cover 212 of the embodiments of the present application can be any one wall of the shell 21, for example, the end cover 212 can be the largest wall among the multiple walls included in the shell 21, or the smallest wall, or it can also be other walls, the embodiments of the present application are not limited thereto. Or, the end cover 212 can also be other structures, for example, the end cover 212 can also be a groove with an opening to cover the opening 510 of the shell 211, the embodiments of the present application are not limited thereto.

[0129] It should be understood that the battery monomer 20 also includes an electrode terminal 214. The electrode terminal 214 of the embodiments of the present application is used to be electrically connected with the electrode assembly 22 inside the battery monomer 20 to output the electric energy of the battery monomer 20. As shown in Figure 3 to Figure 4 The battery monomer 20 can include at least two electrode terminals 214, which can include at least one first electrode terminal 214a and at least one second electrode terminal 214b. Exemplarily, the first electrode terminal 214a is a positive electrode terminal, which is used to be electrically connected with the positive tab 222a of the electrode assembly 22, and the second electrode terminal 214b is a negative electrode terminal, which is used to be electrically connected with the negative tab 222b of the electrode assembly 22. The first electrode terminal 214a can be directly connected with the positive tab 222a, and the second electrode terminal 214b can be directly connected with the negative tab 222b. Exemplarily, the first electrode terminal 214a can be electrically connected with the positive tab 222a through an adapter 23, and the second electrode terminal 214b can be electrically connected with the negative tab 222b through an adapter 23. It should be understood that in the embodiments of the present application, the positive tab 222a and the negative tab 222b can be collectively referred to as the electrode tab 222.

[0130] In this embodiment, the wall of the housing 211 and the wall of the end cap 212 are both referred to as the wall of the battery cell 20. Figure 3 and Figure 4 The rectangular battery cell 20 shown has a housing 211 with a bottom wall and four side walls. The housing 211 is shaped according to the combination of one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one face of the housing 211 has an opening to allow one or more electrode assemblies 22 to be placed inside. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open face, meaning that this plane has no wall, allowing communication between the inside and outside of the housing 211. When the housing 211 is a hollow cylinder, the end face of the housing 211 is an open face, meaning that this end face has no wall, allowing communication between the inside and outside of the housing 211. An end cap 212 covers the opening and connects to the housing 211 to form a closed cavity for placing the electrode assemblies 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0131] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are provided inside the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure.

[0132] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are disposed within the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure. In this embodiment, the material of the housing 211 may include the following materials: copper, iron, aluminum, steel, aluminum alloy, etc.

[0133] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0134] The pressure relief mechanism 213 can be any of the possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0135] Figure 5 A partial structural schematic diagram of a battery cell 20 provided in an embodiment of this application is shown. Figure 6 A partial cross-sectional schematic diagram of a battery cell 20 provided in an embodiment of this application is shown.

[0136] In some implementations, such as Figure 3 to Figure 6 As shown, the battery cell 20 includes: a housing 21, electrode terminals 214, and an insulating component 60. The housing 21 includes a first wall 215 with an electrode lead-out hole 216, and a receiving cavity 50 is formed inside the housing 21. The electrode terminals 214 are disposed on the first wall 215 and are disposed opposite to the electrode lead-out hole 216. The insulating component 60 is disposed on the first wall 215 and surrounds the outer periphery of the electrode terminals 214. One of the insulating component 60 and the electrode terminals 214 is provided with a protrusion structure 80, and the other of the insulating component 60 and the electrode terminals 214 is provided with a groove structure 70, and at least part of the protrusion structure 80 is accommodated in the groove structure 70.

[0137] It should be understood that the outer casing 21 in this embodiment includes a housing 211 and an end cap 212. Exemplarily, the first wall 215 in this embodiment may be formed on the housing 211 or the end cap 212. That is, the wall of the housing 211 is provided with an electrode lead-out hole 216 extending through the housing 211 along its thickness direction; or, the end cap 212 is provided with an electrode lead-out hole 216 extending through the end cap 212 along its thickness direction. It should also be understood that the receiving cavity 50 formed inside the outer casing 21 can be used to receive the electrode assembly 22.

[0138] It should also be understood that the shape of the electrode lead-out hole 216 in this embodiment can be matched with the shape of the electrode terminal 214. For example, the shape of the electrode lead-out hole 216 in the plane perpendicular to the thickness direction of the housing 21 can be set as follows: Figure 5 The circle shown in the image.

[0139] It should also be understood that the electrode terminal 214 and the electrode lead-out hole 216 being arranged opposite each other in the embodiments of this application can mean that, on a plane perpendicular to the thickness direction of the housing 21, the orthographic projection of the electrode terminal 214 covers the orthographic projection of the electrode lead-out hole 216.

[0140] The insulating component 60, also referred to as upper plastic, is used to fix the electrode terminal 214 on the first wall 215. Specifically, the insulating component 60 (such as epoxy resin) can flow and fill all the tiny gaps and unevenness between the electrode terminal 214 and the mounting hole of the first wall 215 when in liquid state, and forms a uniform and non-porous sealing layer after solidification, which can be used for sealing and insulation. In addition, in the case that the first wall 215 and the electrode terminal 214 thereon bear a huge mechanical stress, the insulating component 60 uniformly transmits the load to the entire connection interface, reduces the local stress concentration, and reduces the risk of micro-cracks caused by spot welding or mechanical clamping.

[0141] In some embodiments, one of the insulating component 60 and the electrode terminal 214 is provided with a protruding structure 80 on the side facing the electrode terminal 214, and the other of the insulating component 60 and the electrode terminal 214 is provided with a groove structure 70 on the side facing the protruding structure 80, which can include the following possible implementations:

[0142] In one possible implementation, the insulating component 60 is provided with a protruding structure 80 on the side facing the electrode terminal 214, and the electrode terminal 214 is provided with a groove structure 70 on the side facing the protruding structure 80.

[0143] In another possible implementation, the electrode terminal 214 is provided with a protruding structure 80 on the side facing the insulating component 60, and the insulating component 60 is provided with a groove structure 70 on the side facing the protruding structure 80.

[0144] In some embodiments, the insulating component 60 and the protruding structure 80 can be integrally formed, or the insulating component 60 and the protruding structure 80 can be connected by welding or other means, which are not limited in the present application.

[0145] In some embodiments, in the plane of the thickness direction of the first wall 215, the protruding structure 80 can be a continuous rectangle, or a rectangle arranged at intervals. Alternatively, in the direction perpendicular to the thickness direction of the first wall 215, the protruding structure 80 can be a complete annular structure arranged around the electrode terminal 214, or can be an annular structure with partitions in the middle.

[0146] Correspondingly, in the plane of the thickness direction of the first wall 215, the groove structure 70 can be a continuous rectangle, or a rectangle arranged at intervals. Alternatively, in the direction perpendicular to the thickness direction of the first wall 215, the groove structure 70 can be a complete annular structure, or can be an annular structure with partitions in the middle.

[0147] Optionally, when the groove structure 70 is an interrupted circular ring, that is, multiple sections finally form a circular ring-shaped groove structure 70, the interval between the multiple sections can be greater than half the diameter of the groove structure 70.

[0148] It should be understood that the interval between each section of the multiple sections can also be different, and the present application does not make any limitation thereon.

[0149] In some embodiments, the at least partial accommodation of the protruding structure 80 in the groove structure 70 means that the groove structure 70 and the protruding structure 80 are matched and connected or clamped to be fixed.

[0150] Optionally, it should also be understood that, as Figure 6 shown, the battery monomer 20 in the embodiment of the present application also includes a fixing part 2143, which can also be called a welding ring, the fixing part 2143 is separated from the electrode terminal 214 by the insulating part 60, and the fixing part 2143 is connected with the insulating part 60 and the first wall 215 respectively, and the fixing part 2143 can be provided as a conductive structure. Specifically, the electrode terminal 214, the insulating part 60, the fixing part 2143 and the first wall 215 are connected in sequence to realize the fixed connection of the electrode terminal 214 to the first wall 215.

[0151] In the scheme of the embodiment of the present application, when the electrode terminal 214 is subjected to external torsional force or bending force, the at least partial accommodation of the protruding structure 80 in the groove structure 70 can effectively disperse the stress to the whole structure, reduce the risk of deformation or fracture caused by local stress concentration, and further improve the overall structural stability of the electrode terminal 214; secondly, by the at least partial accommodation of the protruding structure 80 in the groove structure 70, the electrode terminal 214 can still maintain stable structural performance when subjected to internal pressure changes of the battery monomer 20, thereby reducing the risk of short circuit caused by deformation of the electrode terminal 214; in addition, the sealing performance between the electrode terminal 214 and the first wall 215 can also be improved, so as to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the insulating part 60 and the electrode terminal 214 in different use conditions, thereby improving the use performance of the battery monomer 20.

[0152] Figure 7 Part of the cross-sectional view of the battery monomer 20 provided by another embodiment of the present application is shown.

[0153] According to some embodiments of the present application, optionally, as Figure 7 shown, the entire protruding structure 80 is accommodated in the groove structure 70.

[0154] It should be understood that, in the case that the entire protruding structure 80 is accommodated in the recessed structure 70, the surface of the protruding structure 80 on the side facing the recessed structure 70 can be attached or fixedly connected with the inner surface of the recessed structure 70. By accommodating the entire protruding structure 80 in the recessed structure 70, the space utilization of the battery monomer 20 can be improved, and the overall energy density can be improved.

[0155] In the scheme of the embodiments of the present application, by arranging the entire protruding structure 80 to be accommodated in the recessed structure 70, the risk of deformation or fracture caused by local stress concentration is further reduced, and the overall structural stability of the electrode terminal 214 is further improved. Secondly, by accommodating the entire protruding structure 80 in the recessed structure 70, the electrode terminal 214 can still maintain stable structural performance when subjected to internal pressure changes of the battery monomer 20, and the short circuit risk caused by deformation of the electrode terminal 214 is reduced. In addition, by accommodating the entire protruding structure 80 in the recessed structure 70, the sealing performance between the electrode terminal 214 and the first wall 215 is further improved, so as to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the insulating component 60 and the electrode terminal 214 in different use conditions, thereby improving the use performance of the battery monomer 20.

[0156] According to some embodiments of the present application, optionally, as shown in Figure 7 The insulating component 60 includes a first portion 61 arranged between the first wall 215 and the electrode terminal 214, the first portion 61 includes a first surface 610 facing the electrode terminal 214, the protruding structure 80 includes a first protrusion 810 extending from the first surface 610 towards the electrode terminal 214, the recessed structure 70 includes a first recess 710 formed on the electrode terminal 214, and at least part of the first protrusion 810 is accommodated in the first recess 710.

[0157] In some embodiments, the electrode terminal 214 can be gradually tapered in the thickness direction of the first wall 215 and away from the accommodation cavity 50, and the insulating component 60 between the side of the electrode terminal 214 facing the accommodation cavity 50 and the first wall 215 can be referred to as the first portion 61.

[0158] The first recess 710 is a recess formed on the surface of the electrode terminal 214 on the side facing the accommodation cavity 50 in the thickness direction of the first wall 215.

[0159] Optionally, the number of first recesses 710 can be one or more, and correspondingly, the number of first protrusions 810 can be one or more, and the number of first recesses 710 can be the same as the number of first recesses 710.

[0160] In the scheme of the embodiments of the present application, by arranging the first protrusion 810 on the first surface 610 of the first part 61 and forming the first groove 710 on the electrode terminal 214, at least part of the first protrusion 810 is accommodated in the first groove 710, so as to take into account the structural stability and safety performance of the battery monomer 20, while also taking into account the sealing performance of the battery monomer 20, thereby improving the use performance of the battery monomer 20.

[0161] According to some embodiments of the present application, optionally, as shown in Figure 7 The size D1 of the first groove 710 and the size D2 between the first surface 2140 and the second surface 2141 of the electrode terminal 214 in the thickness direction of the first wall 215 satisfy: 1.2≤D2 / D1≤4; wherein the first surface 2140 is the surface of the electrode terminal 214 close to the accommodation cavity 50, and the second surface 2141 is the surface of the electrode terminal 214 farthest from the first surface 2140 in the thickness direction of the first wall 215.

[0162] In some embodiments, the electrode terminal 214 can be gradually smaller in the thickness direction of the first wall 215 and away from the accommodation cavity 50, and the size D2 between the first surface 2140 and the second surface 2141 of the electrode terminal 214 can also refer to the thickness of the first step of the electrode terminal 214 closest to the accommodation cavity 50.

[0163] It should be understood that in the thickness direction perpendicular to the first wall 215, the size D1 of the first groove 710 in the embodiments of the present application can refer to the maximum size, the minimum size or the average size of the first groove 710 in the thickness direction perpendicular to the first wall 215. The size D2 between the first surface 2140 and the second surface 2141 of the electrode terminal 214 in the embodiments of the present application can refer to the maximum size, the minimum size or the average size of the first surface 2140 and the second surface 2141 of the electrode terminal 214 in the thickness direction perpendicular to the first wall 215.

[0164] Exemplarily, in the thickness direction of the first wall 215, the ratio D2 / D1 between the size D1 of the first groove 710 and the size D2 between the first surface 2140 and the second surface 2141 of the electrode terminal 214 can be set to: 1.2, 1.6, 2, 2.4, 2.8, 3.2, 3.6, 4, etc., or the value is within the range obtained by any two of the above combinations.

[0165] Optionally, referring to 7, along the thickness direction of the first wall 215, the dimension D1 of the first groove 710 and the dimension D4 between the first surface 2140 and the third surface 2142 of the electrode terminal 214 satisfy: 3≤D4 / D1≤10; wherein, the first surface 2140 is the surface of the electrode terminal 214 near the receiving cavity 50, and the third surface 2142 is the surface of the electrode terminal 214 that is furthest from the first surface 2140 in the thickness direction of the first wall 215.

[0166] In some embodiments, the electrode terminal 214 may be a stepped shape that gradually decreases in size along the thickness direction of the first wall 215 and away from the receiving cavity 50. The dimension D4 between the first surface 2140 and the third surface 2142 of the electrode terminal 214 may also refer to the thickness of the step of the electrode terminal 214 that is furthest away from the receiving cavity 50.

[0167] For example, along the thickness direction of the first wall 215, the ratio D4 / D1 between the dimension D1 of the first groove 710 and the dimension D4 between the first surface 2140 and the third surface 2142 of the electrode terminal 214 can be set to: 3, 4, 5, 6, 7, 8, 9, 10, etc., or its value is within the range obtained by any combination of the above two values.

[0168] In the embodiment of this application, the ratio between the dimension D1 of the first groove 710 and the dimension D2 between the first surface 2140 and the second surface 2141 of the electrode terminal 214 is set within this range. On the one hand, this can reduce the risk of deformation or fracture caused by local stress concentration, thereby further improving the overall structural stability of the electrode terminal 214. On the other hand, it can increase the stiffness of the electrode terminal 214 to reduce the risk of deformation of the electrode terminal 214, thereby further improving the structural stability of the battery cell 20.

[0169] Figure 8 A partial cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application is shown. Figure 9 A partial cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application is shown.

[0170] According to some embodiments of this application, optionally, such as Figure 8 As shown, the insulating component 60 includes a second portion 62 disposed on the electrode terminal 214. The second portion 62 includes a second surface 611 perpendicular to the thickness direction of the first wall 215 and facing the electrode terminal 214. The protrusion structure 80 includes a second protrusion 820 extending from the second surface 611 toward the electrode terminal 214. The groove structure 70 includes a second groove 720 formed in the electrode terminal 214. At least a portion of the second protrusion 820 is accommodated in the second groove 720.

[0171] In some embodiments, the electrode terminal 214 can be tapered and stepped away from the accommodation cavity 50 along the thickness direction of the first wall 215, and the portion of the insulating component 60 arranged on the step closest to the accommodation cavity 50 is referred to as the second portion 62.

[0172] It should be understood that the second protrusion 820 can be partially accommodated in the second groove 720, or can be entirely accommodated in the second groove 720.

[0173] Optionally, as shown in Figure 9 the second portion 62 includes a fourth surface 613 extending parallel to the thickness direction of the first wall 215 and towards the electrode terminal 214, the protrusion structure 80 includes a sixth protrusion 860 extending from the fourth surface 613 towards the electrode terminal 214, and the groove structure 70 includes a sixth groove 760 formed in the electrode terminal 214, and at least part of the sixth protrusion 860 is accommodated in the sixth groove 760.

[0174] It should be understood that the second groove 720 has a shape similar to that of the first groove 710, and the second protrusion 820 has a shape similar to that of the first protrusion 810, which will not be described herein.

[0175] In the scheme of the embodiments of the present application, by arranging the second protrusion 820 on the second surface 611 of the second portion 62 of the insulating component 60, and arranging the second groove 720 on the electrode terminal 214, and at least part of the second protrusion 820 is accommodated in the second groove 720, the structural stability and safety performance of the battery monomer 20 can be considered, and at the same time, the sealing performance of the battery monomer 20 can also be considered, thereby improving the use performance of the battery monomer 20.

[0176] According to some embodiments of the present application, optionally, as shown in Figure 8 the distance D3 between the first groove 710 and the second groove 720 along the thickness direction of the first wall 215 and the size D2 between the first surface 2140 and the second surface 2141 of the electrode terminal 214 satisfy: 0.25≤D3 / D2≤0.8.

[0177] It should be understood that, in the thickness direction of the first wall 215, the distance D3 between the first groove 710 and the second groove 720 in the embodiments of the present application can refer to the maximum size, minimum size or average size of the distance between the first groove 710 and the second groove 720 in the thickness direction of the first wall 215.

[0178] Exemplarily, along the thickness direction of the first wall 215, the ratio D3 / D2 between the distance D3 between the first groove 710 and the second groove 720 and the size D2 between the first surface 2140 and the second surface 2141 of the electrode terminal 214 can be set to be 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, or the like, or a value within a range obtained by any two of the above values.

[0179] Optionally, in the thickness direction perpendicular to the first wall 215, the interval between the first groove 710 and the second groove 720 can be greater than 0.5 times the size of the first groove 710 or the second groove 720 in the thickness direction perpendicular to the first wall 215. At this time, in the thickness direction of the first wall 215, the interval between the first groove 710 and the second groove 720 can be greater than 0, or be set to be greater than 0.5 times the size of the first groove 710 or the second groove 720 in the thickness direction perpendicular to the first wall 215.

[0180] In the scheme of the embodiments of the present application, by setting the ratio between the distance D3 between the first groove 710 and the second groove 720 and the size D2 between the first surface 2140 and the second surface 2141 of the electrode terminal 214 within the range, on the one hand, the risk of deformation or fracture caused by local stress concentration can be reduced, and the structural stability of the electrode terminal 214 as a whole can be further improved; on the other hand, the rigidity of the electrode terminal 214 can be improved, so as to reduce the risk of deformation of the electrode terminal 214, and the structural stability of the battery monomer 20 can be further improved.

[0181] Figure 10 A partial cross-sectional schematic view of a battery monomer 20 provided by another embodiment of the present application is shown.

[0182] According to some embodiments of the present application, optionally, as shown in Figure 10 The insulating component 60 includes a third portion 63 arranged on the first wall 215, the third portion 63 includes a third surface 612 facing the electrode terminal 214, the protruding structure 80 includes a third protrusion 830 extending from the third surface 612 towards the electrode terminal 214, the groove structure 70 includes a third groove 730 formed on the electrode terminal 214, and at least part of the third protrusion 830 is accommodated in the third groove 730.

[0183] In some embodiments, the protruding structure 80 includes a third protrusion 830 extending from the third surface 612 towards the electrode terminal 214, which means that the third protrusion 830 is obtained by extending the third portion 63 in the thickness direction perpendicular to the first wall 215.

[0184] Optionally, in the case where the first groove 710 and the third groove 730 exist simultaneously, the orthographic projection of the first groove 710 and the third groove 730 do not coincide in the plane perpendicular to the thickness direction of the first wall 215, so as to improve the strength of the electrode terminal 214.

[0185] Optionally, in the case where the second groove 720 and the third groove 730 exist simultaneously, the orthographic projection of the second groove 720 and the third groove 730 do not coincide in the plane parallel to the thickness direction of the first wall 215, so as to improve the strength of the electrode terminal 214.

[0186] In the scheme of the embodiments of the present application, by arranging the third protrusion 830 on the third surface 612 of the third portion 63 of the insulating component 60, arranging the third groove 730 on the electrode terminal 214, and accommodating at least part of the third protrusion 830 in the third groove 730, the structure stability and safety performance of the battery monomer 20 can be considered at the same time, and the sealing performance of the battery monomer 20 can also be considered, so as to improve the use performance of the battery monomer 20.

[0187] Figure 11 Part of the cross-sectional schematic diagram of the battery monomer 20 provided by another embodiment of the present application is shown.

[0188] According to some embodiments of the present application, optionally, as shown in Figure 11 The bottom wall 231 of the insulating component 60 extends towards the first wall 215 to form a fourth protrusion 840, and the surface of the first wall 215 towards the insulating component 60 is formed with a fourth groove 740, and at least part of the fourth protrusion 840 is accommodated in the fourth groove 740.

[0189] The bottom wall 231 of the insulating component 60 extends towards the first wall 215 to form a fourth protrusion 840, which means that the surface of the insulating component 60 closest to the accommodating cavity 50 in the thickness direction of the first wall 215 extends towards the first wall 215 to form the fourth protrusion 840.

[0190] In some embodiments, the fourth groove 740 and the first groove 710 can be arranged at intervals in the thickness direction of the first wall 215, or in other words, the orthographic projection of the fourth groove 740 and the orthographic projection of the first groove 710 can not coincide in the thickness direction of the first wall 215. Alternatively, the orthographic projection of the fourth groove 740 and the orthographic projection of the first groove 710 can at least partially coincide in the thickness direction of the first wall 215.

[0191] In the embodiment of this application, a fourth groove 740 is formed on the surface of the first wall 215 facing the insulating member 60, and a fourth protrusion 840 is formed on the bottom wall 231 of the insulating member 60. A portion of the fourth protrusion 840 is accommodated in the fourth groove 740, so as to take into account both the structural stability and safety performance of the battery cell 20, as well as the sealing performance of the battery cell 20, thereby improving the performance of the battery cell 20.

[0192] In the above embodiments, the description is based on the example of the insulating component 60 having a protruding structure 80 and the electrode terminal 214 having a groove structure 70. It should be understood that the groove structure 70 is provided at the position where the insulating component 60 has a protruding structure 80 in the above embodiments, and correspondingly, the protruding structure 80 is provided at the position where the electrode terminal 214 has a groove structure 70 in the above embodiments, which is also within the protection scope of this application.

[0193] Figure 12 A partial cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application is shown.

[0194] According to some embodiments of this application, optionally, such as Figure 12 As shown, the insulating component 60 includes a first portion 61 disposed between the first wall 215 and the electrode terminal 214. The first portion 61 includes a first surface 610 facing the electrode terminal 214. The protrusion structure 80 includes a fifth protrusion 850 extending from the electrode terminal 214 toward the first surface 610. The groove structure 70 includes a fifth groove 750 formed on the first surface 610. At least a portion of the fifth protrusion 850 is received in the fifth groove 750.

[0195] It should be understood that the fifth groove 750 is similar in shape to the first groove 710, and the fifth protrusion 850 is similar in shape to the first protrusion 810; these will not be described further in this application.

[0196] In the embodiment of this application, at least a portion of the fifth protrusion 850 is accommodated in the fifth groove 750, so as to take into account both the structural stability and safety performance of the battery cell 20, as well as the sealing performance of the battery cell 20, thereby improving the performance of the battery cell 20.

[0197] According to some embodiments of this application, optionally, the number of protrusion structures 80 is set to multiple, the number of groove structures 70 is set to multiple, and the multiple protrusion structures 80 correspond one-to-one with the multiple groove structures 70.

[0198] It should be understood that the number of protruding structures 80 and groove structures 70 in the embodiments of this application can be set according to actual needs. For example, there can be two protruding structures 80, and correspondingly, there are also two groove structures 70, with the two protruding structures 80 and the two groove structures 70 arranged in a one-to-one correspondence.

[0199] In the scheme of the embodiments of the present application, by setting the number of the protruding structures 80 to be multiple, the number of the groove structures 70 to be multiple, and the multiple protruding structures 80 corresponding to the multiple groove structures 70 one by one, the stress can be effectively dispersed to the whole structure, the risk of deformation or fracture caused by local stress concentration can be reduced, and the structural stability of the electrode terminal 214 as a whole can be improved; secondly, the electrode terminal 214 can still maintain stable structural performance when the electrode terminal 214 is subjected to the change of the internal gas pressure of the battery monomer 20, and the risk of short circuit caused by the deformation of the electrode terminal 214 can be reduced; in addition, the sealing performance between the electrode terminal 214 and the first wall 215 can also be improved, so as to effectively reduce the risk of electrolyte leakage caused by the mutual displacement between the insulating component 60 and the electrode terminal 214 in different use conditions, and the use performance of the battery monomer 20 can be improved.

[0200] According to some embodiments of the present application, the embodiments of the present application further provide a battery device, which comprises a plurality of battery monomers 20, wherein the battery monomer 20 can be the battery monomer 20 in any one of the above-mentioned embodiments.

[0201] According to some embodiments of the present application, the embodiments of the present application further provide a power consumption device, which comprises the battery device 10 in any one of the above-mentioned embodiments, and the battery device 10 is used to provide electric energy for the power consumption device. Specifically, the power consumption device can be the vehicle 1 as shown in the above-mentioned embodiments, and can also be any power consumption device using the battery device 10. Figure 1 The power consumption device can be the vehicle 1 as shown in the above-mentioned embodiments, and can also be any power consumption device using the battery device 10.

[0202] The power consumption device can be the vehicle 1 as shown in the above-mentioned embodiments, and can also be any power consumption device using the battery device 10.

[0203] According to some embodiments of the present application, referring to Figure 3 to Figure 12The application provides a battery monomer 20, which comprises a shell 21, an electrode terminal 214 and an insulating component 60, wherein the shell 21 comprises a first wall 215, the first wall 215 is provided with an electrode lead-out hole 216, and an accommodating cavity 50 is formed in the shell 21; the electrode terminal 214 is arranged on the first wall 215, and the electrode terminal 214 is arranged opposite to the electrode lead-out hole 216; the insulating component 60 is arranged on the first wall 215 and surrounds the outer periphery of the electrode terminal 214; wherein one of the insulating component 60 and the electrode terminal 214 is provided with a protruding structure 80, the other of the insulating component 60 and the electrode terminal 214 is provided with a groove structure 70, and at least part of the protruding structure 80 is accommodated in the groove structure 70. All the protruding structures 80 are accommodated in the groove structure 70. The insulating component 60 comprises a first part 61 arranged between the first wall 215 and the electrode terminal 214, the first part 61 comprises a first surface 610 facing the electrode terminal 214, the protruding structure 80 comprises a first protrusion 810 extending towards the electrode terminal 214 from the first surface 610, the groove structure 70 comprises a first groove 710 formed in the electrode terminal 214, and at least part of the first protrusion 810 is accommodated in the first groove 710. In the thickness direction of the first wall 215, the size D2 of the first groove 710 and the size D1 between the first surface 2140 and the second surface 2141 of the electrode terminal 214 satisfy the relationship: 1.2≤D2 / D1≤4; wherein the first surface 2140 is the surface of the electrode terminal 214 close to the accommodating cavity 50, and the second surface 2141 is the surface of the electrode terminal 214 farthest from the first surface 2140 in the thickness direction of the first wall 215.

[0204] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the 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 to 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 application, and they should be covered in the scope of the claims and the description of the application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The 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 cell, characterized by, The application relates to an electrode terminal structure of a battery, comprising: a shell (21) comprising a first wall (215) provided with an electrode lead-out hole (216), the shell (21) internally forming a containing cavity (50); an electrode terminal (214) arranged on the first wall (215) and arranged opposite the electrode lead-out hole (216); an insulating component (60) arranged on the first wall (215) and surrounding the outer periphery of the electrode terminal (214); wherein one of the insulating component (60) and the electrode terminal (214) is provided with a protruding structure (80), and the other is provided with a groove structure (70), and at least part of the protruding structure (80) is accommodated in the groove structure (70).

2. The battery cell of claim 1, wherein, All of the protruding structure (80) is accommodated in the groove structure (70).

3. The battery cell of claim 1, wherein, The insulating component (60) comprises a first part (61) arranged between the first wall (215) and the electrode terminal (214), and the first part (61) comprises a first surface (610) facing the electrode terminal (214), the protruding structure (80) comprises a first protrusion (810) extending from the first surface (610) towards the electrode terminal (214), and the groove structure (70) comprises a first groove (710) formed on the electrode terminal (214), and at least part of the first protrusion (810) is accommodated in the first groove (710).

4. The battery cell of claim 3, wherein, In the thickness direction of the first wall (215), the size D1 of the first groove (710) and the size D2 between the first surface (2140) and the second surface (2141) of the electrode terminal (214) satisfy the relationship 1.2<=D2 / D1<=4; wherein the first surface (2140) is the surface of the electrode terminal (214) close to the containing cavity (50), and the second surface (2141) is the surface of the electrode terminal (214) farthest from the first surface (2140) in the thickness direction of the first wall (215).

5. The battery cell of claim 3, wherein, The insulating component (60) comprises a second part (62) arranged on the electrode terminal (214), and the second part (62) comprises a second surface (611) perpendicular to the thickness direction of the first wall (215) and facing the electrode terminal (214), the protruding structure (80) comprises a second protrusion (820) extending from the second surface (611) towards the electrode terminal (214), and the groove structure (70) comprises a second groove (720) formed on the electrode terminal (214), and at least part of the second protrusion (820) is accommodated in the second groove (720).

6. The battery cell of claim 5, wherein, In the thickness direction of the first wall (215), the distance D3 between the first groove (710) and the second groove (720) and the size D2 between the first surface (2140) and the second surface (2141) of the electrode terminal (214) satisfy the relationship 0.25<=D3 / D2<=0.

8.

7. The battery cell of claim 3, wherein, The insulating component (60) comprises a third portion (63) disposed on the first wall (215), the third portion (63) comprises a third surface (612) facing the electrode terminal (214), The protrusion structure (80) comprises a third protrusion (830) extending from the third surface (612) towards the electrode terminal (214), the groove structure (70) comprises a third groove (730) formed on the electrode terminal (214), at least part of the third protrusion (830) is accommodated in the third groove (730).

8. The battery cell of any one of claims 1 to 7, wherein, A bottom wall (231) of the insulating component (60) extends towards the first wall (215) to form a fourth protrusion (840), a surface of the first wall (215) facing the insulating component (60) is provided with a fourth groove (740), at least part of the fourth protrusion (840) is accommodated in the fourth groove (740).

9. The battery cell of any one of claims 1 to 7, wherein, The insulating component (60) comprises a first portion (61) disposed between the first wall (215) and the electrode terminal (214), the first portion (61) comprises a first surface (610) facing the electrode terminal (214), The protrusion structure (80) comprises a fifth protrusion (850) extending from the electrode terminal (214) towards the first surface (610), the groove structure (70) comprises a fifth groove (750) formed on the first surface (610), at least part of the fifth protrusion (850) is accommodated in the fifth groove (750).

10. The battery cell of any one of claims 1 to 7, wherein, The number of the protrusion structure (80) is set to be multiple, the number of the groove structure (70) is set to be multiple, and the multiple protrusion structures (80) and the multiple groove structures (70) correspond one by one.

11. A battery device characterized by comprising: Comprise: A plurality of battery monomers, the battery monomers are the battery monomers as claimed in any one of claims 1 to 10.

12. An electrical device, comprising: Comprise: The battery device as claimed in claim 11, the battery device is used to provide electric energy for the electric device.

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