Battery cell, battery device, electric device, and energy storage device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device, a power utilization device and an energy storage device. The battery monomer comprises a shell, an electrode terminal, an electrode assembly, an adapter and an insulating part, the electrode terminal is arranged on the shell. The electrode assembly is arranged in the shell, and the electrode assembly is provided with a tab. The tab is electrically connected with the electrode terminal through an adapter, the adapter comprises a first connecting part and a second connecting part, the first connecting part is electrically connected with the electrode terminal, and the second connecting part is electrically connected with the tab. And at least part of the insulating part is arranged between the adapter and the shell. According to the battery monomer provided by the embodiment of the invention, the additional insulating part is arranged between the adapter and the shell, so that the possibility of lap joint short circuit caused by insulation failure between the adapter and the shell can be reduced to a certain extent, and the reliability of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device, a power utilization device and an energy storage device. BACKGROUND

[0002] This section is intended to provide background information to facilitate a better understanding of embodiments of the present application. It is not admitted that any of the information provided in this section is prior art.

[0003] In a new energy vehicle equipped with a battery device, the battery device can be used to provide power in whole or in part. The tab of the battery monomer of the battery device is usually connected to the electrode terminal through an adapter. In the related art, there may be insulation failure between the adapter and the shell, thereby causing the problem of lap joint short circuit. UTILITARIAN CONTENT

[0004] Therefore, the embodiments of the present application expect to provide a battery monomer, a battery device, a power utilization device and an energy storage device, which can reduce the possibility of lap joint short circuit caused by insulation failure between the adapter and the shell, and improve the reliability of the battery monomer.

[0005] To achieve the above-mentioned purpose, a first aspect of the embodiments of the present application provides a battery monomer, comprising:

[0006] a shell;

[0007] an electrode terminal, the electrode terminal being arranged in the shell;

[0008] an electrode assembly, the electrode assembly being arranged in the shell, the electrode assembly being provided with a tab;

[0009] an adapter, the tab and the electrode terminal being electrically connected through the adapter, the adapter comprising a first connecting portion and a second connecting portion, the first connecting portion being electrically connected with the electrode terminal, and the second connecting portion being electrically connected with the tab;

[0010] an insulating member, at least part of the insulating member being arranged between the adapter and the shell.

[0011] The battery monomer provided by the embodiment of the application comprises a shell, an electrode terminal, an electrode assembly, a connecting piece and an insulating piece. The electrode assembly is provided with a tab, the tab can guide current out of the electrode assembly, the shell is provided with at least one electrode terminal, and the electrode terminal is electrically connected with the tab through the connecting piece. By setting the connecting piece to comprise a first connecting part and a second connecting part, the first connecting part is electrically connected with the electrode terminal, the second connecting part is electrically connected with the tab, and the insulating piece is arranged between the connecting piece and the shell, that is, by arranging the additional insulating piece between the connecting piece and the shell, the possibility of short circuit caused by insulation failure between the connecting piece and the shell can be reduced to a certain extent, thereby improving the reliability of the battery monomer.

[0012] In some embodiments, at least part of the insulating piece is attached to the connecting piece.

[0013] In the embodiment, by attaching at least part of the insulating piece to the connecting piece, the combination ability between the insulating piece and the connecting piece is improved, and the possibility of the connecting piece directly contacting the tab of the electrode assembly is further reduced.

[0014] In some embodiments, at least part of the insulating piece is attached to the shell.

[0015] Here, even if the normal battery monomer can be affected by the heat of the thermal runaway battery monomer, the lower plastic between the connecting piece and the shell in the normal battery monomer is damaged, but since the additional insulating piece is arranged on the shell, the connecting piece will not directly contact the shell, thereby reducing the possibility of insulation failure between the connecting piece and the shell.

[0016] In some embodiments, the melting point of the insulating piece is T, .

[0017] In the embodiment, by setting the melting point of the insulating piece to be greater than or equal to 150℃, the reliability of the insulating piece is improved.

[0018] In some embodiments, the energy density of the battery monomer is E, and the relationship between E and T satisfies:

[0019] ;

[0020] .

[0021] Here, when the energy density of the battery monomer is less than 390 Wh / L, the melting point of the insulating piece is set to be greater than or equal to 150 DEG C, that is, a better insulation effect can be achieved, and the requirement of not melting / softening shrinkage in the heat diffusion scene can be met. When the energy density of the battery monomer is greater than or equal to 390 Wh / L, the melting point of the insulating piece is set to be greater than or equal to 200 DEG C, that is, a better insulation effect can be achieved, and the requirement of not melting / softening shrinkage in the heat diffusion scene can be met.

[0022] In some embodiments, the insulating piece is a polyimide film, a polyethylene terephthalate film, a polypropylene film, a polyethylene film, a polyamide, a polyphthalamide film, or a polyphenylene sulfide film.

[0023] High temperature resistance and high insulation.

[0024] In some embodiments, the insulating piece includes a first insulating portion and a second insulating portion, the first insulating portion is arranged between the first connecting portion and the shell, and the second insulating portion is arranged between the second connecting portion and the shell.

[0025] In this embodiment, by arranging the insulating piece to include a first insulating portion and a second insulating portion, and arranging the first insulating portion between the first connecting portion and the shell, and the second insulating portion between the second connecting portion and the shell, the adapter can be covered as much as possible, further reducing the possibility of insulation failure between the adapter and the shell.

[0026] In some embodiments, the shell includes a plurality of surfaces, the plurality of surfaces includes a first surface, the first surface is the largest surface in the plurality of surfaces; the second connecting portion has a welding area, the welding area is electrically connected with the tab;

[0027] The distance between the side of the second insulating portion away from the first surface and the first surface is A1, and the distance between the side of the welding area away from the first surface and the first surface is A2, .

[0028] Here, by arranging the distance between the side of the second insulating portion away from the first surface and the first surface to be greater than or equal to the distance between the side of the welding area away from the first surface and the first surface, that is, the second insulating portion completely covers the welding area, which is conducive to reducing the possibility of insulation failure between the adapter and the shell.

[0029] In some embodiments, the second connecting portion has a welding area, the welding area is electrically connected with the tab, and the second insulating portion covers the welding area.

[0030] In some embodiments, the shell comprises a plurality of surfaces, the plurality of surfaces comprising a first surface, the first surface being a surface with a largest area among the plurality of surfaces; a distance between a side of the first insulating part away from the first surface and the first surface is B, .

[0031] In this embodiment, by setting the distance between the side of the first insulating part away from the first surface and the first surface to 5mm-50mm, the insulating part is made to reduce the occupied space as much as possible, while the covering area of the first insulating part on the adapter is also improved.

[0032] In some embodiments, .

[0033] In this embodiment, by setting the distance between the side of the first insulating part away from the first surface and the first surface to 10mm-35mm, the distance in this range is appropriate, which makes the insulating part reduce the occupied space as much as possible, while further improving the covering area of the first insulating part on the adapter.

[0034] In some embodiments, a distance between a side of the first insulating part close to the first surface and the first surface is less than or equal to a distance between a side of the adapter close to the first surface and the first surface.

[0035] That is, the first insulating part can cover the side of the adapter close to the first surface, thereby reducing the possibility of insulation failure between the adapter and the shell.

[0036] In some embodiments, the shell comprises a plurality of surfaces, the plurality of surfaces comprising a first surface, the first surface being a surface with a largest area among the plurality of surfaces, the first surface being distributed on both sides of the battery monomer along the thickness direction; a distance between the first insulating part and the second insulating part in a first direction is C, wherein the first direction intersects the thickness direction of the battery monomer.

[0037] In this embodiment, by setting the distance between the first insulating part and the second insulating part in the first direction to be less than or equal to 5mm, the distance in this range is appropriate, which makes the insulating part reduce the occupied space as much as possible, improve the assembly efficiency, while also improving the covering area of the insulating part on the adapter.

[0038] In some embodiments, the shell comprises a plurality of surfaces, the plurality of surfaces comprises a first surface, the first surface is a surface with a largest area in the plurality of surfaces, the first surface is distributed on both sides of the battery cell along a thickness direction; the battery cell further comprises a second surface on both sides along a first direction, a distance between the insulation member close to one side of the second surface and the second surface is less than or equal to a distance between the adapter close to one side of the second surface and the second surface; wherein the first direction intersects the thickness direction of the battery cell.

[0039] In this embodiment, the insulation member can cover the side of the adapter close to the second surface, thereby facilitating to reduce the possibility of insulation failure between the adapter and the shell.

[0040] In some embodiments, the thickness of the insulation member is D, .

[0041] In this embodiment, by setting the thickness of the insulation member to 20 μm-200 μm, the thickness in this range is appropriate, which can reduce the occupied space of the insulation member as much as possible, i.e., can reduce the influence on the gap between the shell and the adapter, and at the same time, can make the insulation member have certain strength and other mechanical properties, thereby facilitating to reduce the possibility of the insulation member being pierced, and also facilitating to improve the shrinkage deformation of the insulation member.

[0042] In some embodiments, the shell comprises an end cover and a shell body, the shell body is provided with an opening, and the end cover is arranged on the opening; at least part of the insulation member is arranged between the adapter and the end cover.

[0043] Here, even if the normal battery cell can be affected by the heat of the thermal runaway battery cell, resulting in insulation failure (e.g., the lower plastic is damaged) between the adapter and the end cover inside the normal battery cell, since the additional insulation member is arranged between the adapter and the end cover, the adapter will not directly contact the end cover, thereby reducing the possibility of insulation failure between the adapter and the end cover.

[0044] In some embodiments, the insulation member comprises a third insulation part and a fourth insulation part, the third insulation part and the fourth insulation part are connected, the third insulation part is arranged between the adapter and the end cover, and the fourth insulation part is arranged between the electrode assembly and the shell body.

[0045] In this embodiment, the insulation member is provided with a third insulation part and a fourth insulation part, the third insulation part is arranged between the adapter and the end cover, and the fourth insulation part is arranged between the electrode assembly and the shell. In this way, the adapter can be covered by the third insulation part, reducing the possibility of insulation failure between the adapter and the end cover, and at least part of the electrode assembly is covered by the fourth insulation part, reducing the possibility of insulation failure between the electrode assembly and the shell.

[0046] In some embodiments, the shell includes a plurality of surfaces, the plurality of surfaces includes a first surface, the first surface is the largest surface in the plurality of surfaces, and the fourth insulation part is arranged between the electrode assembly and the first surface.

[0047] It can be understood that the arrangement direction of the battery cell is generally perpendicular to the first surface, and the heat generated after the thermal runaway of the battery cell has a greater thermal impact on the large surface of the adjacent battery cell. Therefore, the fourth insulation part is preferentially arranged between the electrode assembly and the first surface.

[0048] In some embodiments, the battery cell includes a lower plastic, the lower plastic is arranged between the shell and the electrode assembly, and at least part of the insulation member is attached to the lower plastic.

[0049] Here, even if a normal battery cell can be affected by the heat of a thermal runaway battery cell, causing the lower plastic between the adapter and the shell in the normal battery cell to be damaged, since the additional insulation member is arranged on the lower plastic, the adapter will not be in direct contact with the shell, thereby reducing the possibility of insulation failure between the adapter and the shell.

[0050] In some embodiments, the battery cell includes a lower plastic, the lower plastic is arranged between the shell and the electrode assembly, and a side of the lower plastic facing the electrode assembly forms a groove, and the second connecting part is bent towards the top of the battery cell relative to the first connecting part and extends into the groove.

[0051] In this embodiment, the side of the lower plastic facing the electrode assembly is provided with a groove, and the second connecting part is bent towards the top of the battery cell relative to the first connecting part and extends into the groove. The provision of the groove can provide accommodation space for the second connecting part, which is conducive to improving space utilization and structural compactness.

[0052] In some embodiments, at least part of the side wall of the lower plastic away from the electrode assembly is protruding, so that the side wall of the lower plastic corresponding to the side close to the electrode assembly is recessed to form the groove; or at least part of the side wall of the lower plastic close to the electrode assembly is thinned to form the groove.

[0053] For example, by means of punch forming, at least part of the side wall of the lower plastic away from the electrode assembly side is protruded, so that the lower plastic corresponding to the side wall near the electrode assembly side is recessed to form a groove.

[0054] For example, by means of milling, planing and other processing techniques, at least part of the side wall of the lower plastic near the electrode assembly side is thinned to form a groove. The groove formed by this processing method has high precision and is easy to form.

[0055] In some embodiments, the first insulation part and the second insulation part are integrated structures.

[0056] In this embodiment, by setting the first insulation part and the second insulation part as integrated structures, the number of parts can be reduced, and the assembly efficiency can be improved.

[0057] In some embodiments, the first insulation part and the second insulation part are rectangular.

[0058] In this way, the forming efficiency of the first insulation part and the second insulation part can be improved.

[0059] The second aspect of the embodiments of the present application provides a battery device including at least one battery cell as described above.

[0060] The battery cell of the battery device provided by the embodiments of the present application includes a shell, an electrode terminal, an electrode assembly, a connecting piece and an insulation piece. The electrode assembly is provided with a tab, which can guide current out of the electrode assembly. The shell is provided with at least one electrode terminal, and the electrode terminal is electrically connected to the tab through the connecting piece. By setting the connecting piece to include a first connecting part and a second connecting part, the first connecting part is electrically connected to the electrode terminal, and the second connecting part is electrically connected to the tab, and by setting the insulation piece between the connecting piece and the shell, that is, by setting an additional insulation piece between the connecting piece and the shell, the possibility of short circuit caused by insulation failure between the connecting piece and the shell can be reduced to a certain extent, thereby improving the reliability of the battery cell.

[0061] The third aspect of the embodiments of the present application provides a power utilization device including the battery cell as described above or the battery device as described above, and the battery cell or the battery device is used for storing or providing electric energy.

[0062] The battery device provided by the embodiment of the present application comprises a battery monomer, which comprises a shell, an electrode terminal, an electrode assembly, a connecting piece and an insulating piece. The electrode assembly is provided with a tab, the tab can guide current out of the electrode assembly, at least one electrode terminal is arranged on the shell, and the electrode terminal is electrically connected with the tab through the connecting piece. By arranging the connecting piece to comprise a first connecting part and a second connecting part, the first connecting part is electrically connected with the electrode terminal, the second connecting part is electrically connected with the tab, and the insulating piece is arranged between the connecting piece and the shell, that is, by arranging the additional insulating piece between the connecting piece and the shell, the possibility of lap joint short circuit caused by insulation failure between the connecting piece and the shell can be reduced to a certain extent, thereby improving the reliability of the battery monomer.

[0063] The fourth aspect of the embodiment of the present application provides an energy storage device, which comprises the battery monomer or the battery device described above, and the battery monomer or the battery device is used for storing or providing electric energy.

[0064] The energy storage device provided by the embodiment of the present application comprises a battery monomer, which comprises a shell, an electrode terminal, an electrode assembly, a connecting piece and an insulating piece. The electrode assembly is provided with a tab, the tab can guide current out of the electrode assembly, at least one electrode terminal is arranged on the shell, and the electrode terminal is electrically connected with the tab through the connecting piece. By arranging the connecting piece to comprise a first connecting part and a second connecting part, the first connecting part is electrically connected with the electrode terminal, the second connecting part is electrically connected with the tab, and the insulating piece is arranged between the connecting piece and the shell, that is, by arranging the additional insulating piece between the connecting piece and the shell, the possibility of lap joint short circuit caused by insulation failure between the connecting piece and the shell can be reduced to a certain extent, thereby improving the reliability of the battery monomer. BRIEF DESCRIPTION OF DRAWINGS

[0065] Figure 1 The structural schematic diagram of a vehicle is provided for an embodiment of the present application;

[0066] Figure 2 The exploded view of a battery device is provided for an embodiment of the present application;

[0067] Figure 3 The structural schematic diagram of a battery monomer is provided for the first embodiment of the present application;

[0068] Figure 4 The exploded view of Figure 3 ;

[0069] Figure 5 The top view of Figure 3 ;

[0070] Figure 6 The sectional view of Figure 5 in the a-a direction;

[0071] Figure 7 is Figure 6 enlarged view at b;

[0072] Figure 8 is Figure 5 cross-sectional view in the direction of c-c;

[0073] Figure 9 is Figure 8 enlarged view at d;

[0074] Figure 10 is Figure 5 cross-sectional view in the direction of e-e;

[0075] Figure 11 is Figure 10 enlarged view at m;

[0076] Figure 12 is Figure 10 enlarged view at n;

[0077] Figure 13 is a structural schematic view of a battery cell provided by a second embodiment of the present application;

[0078] Figure 14 is a structural schematic view of a battery cell provided by a third embodiment of the present application;

[0079] Figure 15 is a structural schematic view of a battery cell provided by a fourth embodiment of the present application.

[0080] BRIEF DESCRIPTION OF DRAWINGS

[0081] 10, battery cell; 11, adapter; 111, first connecting part; 112, second connecting part; 113, welding area; 12, outer shell; 121, shell body; 122, end cover; 13, electrode terminal; 14, electrode assembly; 141, tab; 15, insulating part; 151, first insulating part; 152, second insulating part; 153, third insulating part; 154, fourth insulating part; 16, lower plastic; 17, first surface; 18, second surface; 21, box body; 211, first box body; 212, second box body; 100, battery device; 200, controller; 300, motor; 1000, vehicle. DETAILED DESCRIPTION

[0082] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0083] If not specifically stated, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0084] With the development of clean energy, more and more devices use electric energy as driving energy, and then as power batteries capable of storing more electric energy and capable of multiple reciprocating charging and discharging, such as lithium ion batteries. Among them, power batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields.

[0085] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0086] 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.

[0087] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator arranged between the positive electrode and the negative electrode can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0088] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0089] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0090] As an example, the positive electrode current collector can adopt a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metal, alloy, surface-treated metal can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc. 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.).

[0091] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only or in combination of two or more. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04(also referred to as LFP for short)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(also referred to as NCM 333 for short), LiNi 0.5 Co 0.2 Mn 0.3 O2(also referred to as NCM 523 for short), LiNi 0.5 Co 0.25 Mn 0.25 O2(also referred to as NCM 211 for short), LiNi 0.6 Co 0.2 Mn 0.2 O2(also referred to as NCM 622 for short), LiNi 0.8 Co 0.1 Mn 0.1 O2(also referred to as NCM 811 for short), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2), and a modified compound thereof. The modified compound refers to a substance obtained by a modification means such as doping or coating on the basis of the above-mentioned substance.

[0092] In some embodiments, the positive electrode can employ 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 foam metal surface can not be provided with the positive electrode active material, or of course can be provided with the positive electrode active material. As an example, the positive electrode active material is filled or / and deposited in the foam metal.

[0093] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0094] As an example, the negative electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. can be employed. The composite current collector can include a 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.).

[0095] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0096] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0097] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, 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 electrode active material for a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0098] 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 electrode active material, or of course, can be provided with a negative electrode active material.

[0099] As an example, the negative electrode active material can be filled or / and deposited in the negative electrode current collector.

[0100] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0101] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0102] In some embodiments, the separator is a separator film. The type of separator film is not particularly limited in the present application, and any known porous separator film having good chemical stability and mechanical stability can be used.

[0103] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can be applied to the surface of the separator film.

[0104] 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.

[0105] 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.

[0106] The liquid electrolyte includes an electrolyte salt and a solvent.

[0107] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro oxalate borate, lithium di-oxalate borate, lithium difluoro di-oxalate phosphate, and lithium tetrafluoro oxalate phosphate.

[0108] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butanedisulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether-based solvent. The ether-based solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0109] In some embodiments, the electrolyte solution can further optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, and an additive capable of improving certain performance of the battery cell, such as an additive capable of improving overcharge / fast charge performance of the battery cell, an additive capable of improving high-temperature performance of the battery cell, an additive capable of improving low-temperature performance of the battery cell, and the like.

[0110] The gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0111] The solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0112] As an example, the polymer of the polymer solid electrolyte can include a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0113] As an example, the inorganic solid electrolyte can be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium-ephosphorus-sulfur, sulfur-silver-ephemeral mineral), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0114] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0115] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of the wound and stacked structures.

[0116] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0117] In some embodiments, the electrode assembly is a stacked structure.

[0118] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0119] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked. One positive electrode sheet can be interposed between adjacent folded segments.

[0120] As an example, the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0121] As an example, a plurality of separators can be provided and interposed between any adjacent positive electrode sheets or negative electrode sheets.

[0122] As an example, the isolation member can be continuously provided between any adjacent positive or negative electrode sheets by folding or winding.

[0123] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0124] In some embodiments, the electrode assembly can be provided with a tab, which can guide current out of the electrode assembly. The tab can include a positive tab and a negative tab.

[0125] 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.

[0126] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shapes of battery cells, including a square battery cell, a blade battery cell, a multi-prismatic battery cell (such as a hexagonal battery cell), etc., without specific limitations in the present application.

[0127] In a new energy vehicle equipped with a battery device, the battery device can be used to provide power in whole or in part. The tabs of the battery cells of the battery device are usually connected to the electrode terminals through adapters. In the related art, during use of the battery cells, a normal battery cell can be affected by heat from a thermal runaway battery cell, causing internal insulation failure of the normal battery cell, thereby causing a short circuit problem between the adapter and the housing.

[0128] In view of this, in order to reduce the possibility of a short circuit between the adapter and the housing due to insulation failure, and to improve the reliability of the battery cell, the present application provides a battery cell. The battery cell includes a housing, an electrode terminal, an electrode assembly, an adapter, and an insulating member. The electrode terminal is provided on the housing. The electrode assembly is provided in the housing, and the electrode assembly is provided with a tab. The tab and the electrode terminal are electrically connected through the adapter, and the adapter includes a first connecting portion and a second connecting portion. The first connecting portion is electrically connected to the electrode terminal, and the second connecting portion is electrically connected to the tab. The insulating member is provided between the adapter and the housing.

[0129] The battery cell provided by the embodiment of the present application comprises a shell, an electrode terminal, an electrode assembly, a connecting piece and an insulating piece. The electrode assembly is provided with a tab, the tab can guide current out of the electrode assembly, at least one electrode terminal is arranged on the shell, and the electrode terminal is electrically connected with the tab through the connecting piece. By arranging the connecting piece to comprise a first connecting part and a second connecting part, the first connecting part is electrically connected with the electrode terminal, the second connecting part is electrically connected with the tab, and the insulating piece is arranged between the connecting piece and the shell, that is, by arranging the additional insulating piece between the connecting piece and the shell, the possibility of lap joint short circuit caused by the insulation failure between the connecting piece and the shell can be reduced to a certain extent, thereby improving the reliability of the battery cell.

[0130] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., for example, the spacecraft includes airplanes, rockets, space shuttles and spaceships, etc.

[0131] Please refer to Figure 1 The inside of the vehicle 1000 can be provided with a controller 200, a motor 300 and a battery device 100, the controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom or the front or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, and is used for the circuit system of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during starting, navigation and running. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0132] The embodiment of the present application provides a kind of energy storage device, comprising a plurality of battery cell 10 or battery device 100 of any embodiment of the present application, battery cell 10 or battery device 100 is used to store or provide electric energy.

[0133] The energy storage device can be used in energy storage power station, wind power generation system, solar power generation system, mobile power system or temporary power supply system, etc. The energy storage device can store electric energy as needed and output electric energy at appropriate time. For example, the energy storage device can store electric energy when electricity consumption is low, and provide electric energy for related users or electric equipment during electricity peak. The energy storage system provided by the embodiment of the present application can be any power system that needs to use energy storage device.

[0134] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0135] Referring to Figures 3 to 15 The battery cell 10 includes a housing 12, an electrode terminal 13, an electrode assembly 14, a jumper 11, and an insulating member 15. The electrode terminal 13 is disposed on the housing 12. The electrode assembly 14 is disposed in the housing 12, and the electrode assembly 14 is provided with a tab 141. The tab 141 is electrically connected to the electrode terminal 13 through the jumper 11, and the jumper 11 includes a first connecting portion 111 and a second connecting portion 112, the first connecting portion 111 is electrically connected to the electrode terminal 13, and the second connecting portion 112 is electrically connected to the tab 141. At least part of the insulating member 15 is disposed between the jumper 11 and the housing 12.

[0136] In some embodiments, referring to Figures 3 to 4 The housing 12 includes a cover 122 and a shell 121, and the shell 121 is provided with an opening, and the cover 122 is provided on the opening. The shell 121 can be provided with one or more openings. The cover 122 can also be provided with one or more openings.

[0137] In some embodiments, at least one electrode terminal 13 is disposed on the housing 12, and the electrode terminal 13 is electrically connected to the tab 141 through the jumper 11. The electrode terminal 13 can be disposed on the cover 122 or on the shell 121.

[0138] Referring to Figure 2 The battery apparatus 100 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 10 connected in series, parallel, or mixed connection through a busbar.

[0139] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells 10.

[0140] As an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells 10 into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 10 with a cable tie.

[0141] In some embodiments, the battery apparatus 100 can be a battery pack, and the battery pack includes a box 21 and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box 21.

[0142] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the case 21 by fixing the battery module in the case 21.

[0143] As an example, the battery cell assembly can also be accommodated in the case 21 by fixing the plurality of battery cells 10 directly to the case 21.

[0144] As an example, referring to Figure 2 , the case 21 can include a first case 21121 and a second case 21221. The first case 21121 and the second case 21221 are fastened so that an enclosed space is formed inside the case 21 to accommodate the battery cell assembly. The enclosed here means covered or closed, which can be sealed or unsealed. The first case 21121 can be a top cover or a bottom plate.

[0145] As an example, the case 21 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that an enclosed space is formed inside the case 21 to accommodate the battery cell assembly.

[0146] In some embodiments, the case 21 can be part of the chassis structure of the vehicle 1000. For example, part of the case 21 can be at least part of the floor of the vehicle 1000, or part of the case 21 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0147] As an example, referring to Figure 4 , the battery cell 10 includes a lower plastic 16 arranged on the inner side of the shell 12 and between the electrode terminal 13 and the shell 12, for realizing insulation between the electrode terminal 13 and the shell 12; in addition, the lower plastic 16 is also arranged between the electrode terminal 13 and the adapter 11, for realizing insulation between the electrode terminal 13 and the adapter 11.

[0148] As an example, the first connecting part 111 and the second connecting part 112 can be a one-piece structure or a split structure.

[0149] The at least partial insulation 15 is arranged between the adapter 11 and the shell 12, that is, by arranging the additional insulation 15 between the adapter 11 and the shell 12, the possibility of lap joint short circuit caused by insulation failure between the adapter 11 and the shell 12 can be reduced to a certain extent, thereby improving the reliability of the battery cell 10.

[0150] Here, even if the normal battery cell 10 can be affected by the heat of the thermal runaway battery cell 10, causing the insulation between the internal adapter 11 and the shell 12 of the normal battery cell 10 to fail (for example, the lower plastic 16 is damaged), but because the additional insulation 15 is provided between the adapter 11 and the shell 12, the adapter 11 will not be in direct contact with the shell 12, thereby reducing the possibility of insulation failure between the adapter 11 and the shell 12.

[0151] At least part of the insulation 15 between the adapter 11 and the shell 12 means that all of the insulation 15 can be provided between the adapter 11 and the shell 12, and part of the insulation 15 can be provided between the adapter 11 and the shell 12.

[0152] The battery cell 10 provided by the embodiment of the application comprises a shell 12, an electrode terminal 13, an electrode assembly 14, an adapter 11 and an insulation 15. The electrode assembly 14 is provided with a tab 141, which can guide current out of the electrode assembly 14, and the shell 12 is provided with at least one electrode terminal 13, which is electrically connected to the tab 141 through the adapter 11. By providing the adapter 11 with a first connecting portion 111 and a second connecting portion 112, the first connecting portion 111 is electrically connected to the electrode terminal 13, and the second connecting portion 112 is electrically connected to the tab 141, and the insulation 15 is provided between the adapter 11 and the shell 12, that is, by providing the additional insulation 15 between the adapter 11 and the shell 12, the possibility of short circuit caused by insulation failure between the adapter 11 and the shell 12 is reduced to a certain extent, thereby improving the reliability of the battery cell 10.

[0153] Here, the insulation 15 is provided between the adapter 11 and the shell 12 in various ways.

[0154] In some embodiments, referring to Figures 6 to 7 At least part of the insulation 15 is attached to the adapter 11.

[0155] Here, all of the insulation 15 can be attached to the adapter 11, or part of the insulation 15 can be attached to the adapter 11.

[0156] Exemplarily, the insulation 15 is attached to the adapter 11 by adhesive.

[0157] In this embodiment, by attaching at least part of the insulation 15 to the adapter 11, the bonding ability between the insulation 15 and the adapter 11 is improved, and the possibility of the adapter 11 directly contacting the tab of the electrode assembly 14 is further reduced.

[0158] In other embodiments, at least part of the insulation 15 is attached to the shell 12.

[0159] Here, even if the normal battery cell 10 can be affected by the heat of the thermal runaway battery cell 10, causing the lower plastic 16 between the adapter 11 inside the normal battery cell 10 and the shell 12 to be damaged, since the additional insulation 15 is provided on the shell 12, the adapter 11 will not be in direct contact with the shell 12, thereby reducing the possibility of insulation failure between the adapter 11 and the shell 12.

[0160] In yet other embodiments, at least part of the insulation 15 is attached to the lower plastic 16.

[0161] Here, even if the normal battery cell 10 can be affected by the heat of the thermal runaway battery cell 10, causing the lower plastic 16 between the adapter 11 inside the normal battery cell 10 and the shell 12 to be damaged, since the additional insulation 15 is provided on the lower plastic 16, the adapter 11 will not be in direct contact with the shell 12, thereby reducing the possibility of insulation failure between the adapter 11 and the shell 12.

[0162] In some embodiments, the melting point of the insulation 15 is T, .

[0163] It can be understood that, in order to reduce the possibility of the insulation 15 melting or shrinking due to heat and causing failure during normal use, the melting point of the insulation 15 needs to be large enough.

[0164] In this embodiment, by setting the melting point of the insulation 15 to be greater than or equal to 150°C, the reliability of the insulation 15 is improved.

[0165] In some embodiments, the energy density of the battery cell 10 is E, and the relationship between E and T satisfies:

[0166] ;

[0167] .

[0168] Here, the higher the energy density of the battery cell 10, the more heat generated after the battery cell 10 thermal runaway, the temperature rise of the large surface after the battery cell 10 thermal runaway, the thermal influence on the adjacent battery cell 10 is intensified, and a higher temperature-resistant insulation 15 is required to not melt / soften / shrink under the heat diffusion scenario.

[0169] That is, as the energy density of the battery cell 10 increases, the melting point of the insulation 15 also increases.

[0170] Here, when the energy density of the battery monomer 10 is less than 390 Wh / L, the melting point of the insulating piece 15 is set to be greater than or equal to 150℃, that is, a better insulation effect can be achieved, and the requirement of not melting / softening and shrinking in the heat diffusion scene can be met. When the energy density of the battery monomer 10 is greater than or equal to 390 Wh / L, the melting point of the insulating piece 15 is set to be greater than or equal to 200℃, that is, a better insulation effect can be achieved, and the requirement of not melting / softening and shrinking in the heat diffusion scene can be met.

[0171] It should be noted that the specific type of the insulating piece 15 is not limited here.

[0172] Exemplarily, the insulating piece 15 is a polyimide film, a polyethylene terephthalate film, a polypropylene film, a polyethylene film, a polyamide film commonly known as nylon film, a polyphthalamide film or a polyphenylene sulfide film.

[0173] The polyimide (PI) film, the polyethylene terephthalate (PET) film, the polypropylene (PP) film, the polyethylene (PE) film, the polyamide (PA), the polyphthalamide (PPA) film and the polyphenylene sulfide (PPS) film all have high temperature resistance and high insulation.

[0174] Of course, the insulating piece 15 can also be other films with high temperature resistance and high insulation.

[0175] Exemplarily, the thickness of the insulating piece 15 is D, .

[0176] Exemplarily, the thickness of the insulating piece 15 can be any one of 20 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm or any point value between any two of them.

[0177] It can be understood that the smaller the thickness of the insulating piece 15, the smaller the influence on the gap between the shell 12 and the adapter 11; the greater the thickness of the insulating piece 15, the better the mechanical properties such as strength of the insulating piece 15, which is conducive to reducing the possibility of the insulating piece 15 being pierced and also conducive to improving the shrinkage deformation of the insulating piece 15.

[0178] In this embodiment, the thickness of the insulating member 15 is set to 20-200 μm, and the thickness in this range is appropriate. The insulating member 15 can be made as thin as possible to reduce the influence on the gap between the housing 12 and the adapter 11, and at the same time, the insulating member 15 can have certain strength and other mechanical properties, which are advantageous for reducing the possibility of the insulating member 15 being punctured and for improving the shrinkage of the insulating member 15.

[0179] In some embodiments, referring to Figure 4 , the insulating member 15 includes a first insulating portion 151 and a second insulating portion 152, the first insulating portion 151 is arranged between the first connecting portion and the housing 12, and the second insulating portion 152 is arranged between the second connecting portion and the housing 12.

[0180] In this embodiment, the insulating member 15 is arranged to include the first insulating portion 151 and the second insulating portion 152, the first insulating portion 151 is arranged between the first connecting portion and the housing 12, and the second insulating portion 152 is arranged between the second connecting portion and the housing 12. In this way, the adapter 11 can be covered as much as possible, which is further advantageous for reducing the possibility of insulation failure between the adapter 11 and the housing 12.

[0181] Exemplarily, referring to Figure 15 , in the height direction of the battery monomer 10, the second connecting portion 112 is higher than the first connecting portion 111.

[0182] Here, the second connecting portion 112 is higher than the first connecting portion 111, that is, the second connecting portion 112 and the first connecting portion 111 are not in the same plane, that is, the distance between the second connecting portion 112 and the bottom end of the housing 12 is greater than the distance between the first connecting portion 111 and the bottom end of the housing 12. Since the tab 141 protrudes from other areas of the electrode assembly 14, by arranging the second connecting portion 112 to be higher than the first connecting portion 111, space is reserved for the tab 141, which is advantageous for improving space utilization and structural compactness.

[0183] In this way, the first connecting portion 111 is electrically connected to the electrode terminal 13, and the second connecting portion 112 is electrically connected to the tab 141, so that the space in the housing 12 can be fully utilized, and the energy density of the battery monomer 10 can be improved.

[0184] In some embodiments, referring to Figures 13 to 14 , the first insulating portion 151 and the second insulating portion 152 are of an integral structure.

[0185] In this embodiment, the first insulating portion 151 and the second insulating portion 152 are arranged as an integral structure, which is advantageous for reducing the number of parts and improving assembly efficiency.

[0186] Of course, in other embodiments, the first insulation part 151 and the second insulation part 152 can also be a split structure, that is, the first insulation part 151 and the second insulation part 152 can be separately formed, so that the first insulation part 151 and the second insulation part 152 can be formed into the required shape, for example, the first insulation part 151 and the second insulation part 152 are both formed into a rectangle.

[0187] Exemplarily, the first insulation part 151 and the second insulation part 152 are both rectangular.

[0188] In this way, the forming efficiency of the first insulation part 151 and the second insulation part 152 can be improved.

[0189] In some embodiments, referring to Figures 4 to 7 , the shell 12 includes a plurality of surfaces, and the plurality of surfaces includes a first surface 17, which is the largest surface in the plurality of surfaces. The second connecting part 112 has a welding area 113 that is electrically connected to the tab 141. The distance between the side of the second insulation part 152 away from the first surface 17 and the first surface 17 is A1, and the distance between the side of the welding area 113 away from the first surface 17 and the first surface 17 is A2, .

[0190] That is, the distance between the side of the second insulation part 152 away from the first surface 17 and the first surface 17 is greater than or equal to the distance between the side of the welding area 113 away from the first surface 17 and the first surface 17.

[0191] That is, the second insulation part 152 covers the welding area 113.

[0192] It should be noted that the first surface 17 in the embodiments of the present application is the large surface of the battery monomer 10, which is the largest surface in the plurality of surfaces of the battery monomer 10.

[0193] Taking a square battery monomer 10 as an example, in the vertical state, the surface formed by the length direction and the width direction of the battery monomer 10 is the bottom surface of the battery monomer 10, the surface formed by the length direction and the height direction of the battery monomer 10 is the large surface of the battery monomer 10, and the surface formed by the width direction and the height direction of the battery monomer 10 is the side surface of the battery monomer 10.

[0194] The second connecting part 112 is connected to the tab 141 by welding, and the place where the second connecting part 112 and the tab 141 are welded is the welding area 113.

[0195] In the embodiment where the electrode assembly 14 is multiple, the second insulation part 152 described herein refers to the second insulation part 152 connected corresponding to the electrode assembly 14, and the first surface 17 described herein refers to the first surface 17 close to the electrode assembly 14.

[0196] Here, by setting the distance between the side of the second insulation part 152 away from the first surface 17 and the first surface 17 to be greater than or equal to the distance between the side of the welding area 113 away from the first surface 17 and the first surface 17, i.e. the second insulation part 152 completely covers the welding area 113, it is beneficial to reduce the possibility of insulation failure between the adapter 11 and the shell 12.

[0197] In some embodiments, referring to Figures 8 to 9 , the shell 12 includes multiple surfaces, and the multiple surfaces include the first surface 17, which is the largest surface in the multiple surfaces. The distance between the side of the first insulation part 151 away from the first surface 17 and the first surface 17 is B, .

[0198] Exemplarily, the distance between the side of the first insulation part 151 away from the first surface 17 and the first surface 17 can be any one of 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 25mm, 28mm, 30mm, 32mm, 35mm, 37mm, 40mm, 43mm, 45mm, 50mm or any point value between any two of them.

[0199] It can be understood that the smaller the distance between the side of the first insulation part 151 away from the first surface 17 and the first surface 17, the smaller the space occupied, which is beneficial to improve the compactness of the structure; the larger the distance between the side of the first insulation part 151 away from the first surface 17 and the first surface 17, the larger the covering area of the first insulation part 151 to the adapter 11.

[0200] In this embodiment, by setting the distance between the side of the first insulation part 151 away from the first surface 17 and the first surface 17 to be 5mm-50mm, it is beneficial to improve the covering area of the first insulation part 151 to the adapter 11 while making the insulation part 15 reduce the occupied space as much as possible.

[0201] In some embodiments, please continue to refer to Figures 8 to 9 , .

[0202] Exemplarily, the distance between the side of the first insulating part 151 away from the first surface 17 and the first surface 17 can be a point value of any one of or a point value between any two of 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm.

[0203] In this embodiment, by setting the distance between the side of the first insulating part 151 away from the first surface 17 and the first surface 17 to be 10 mm-35 mm, a distance in this range is appropriate, which is conducive to further increasing the covering area of the first insulating part 151 on the adapter 11 while making the insulating part 15 reduce the occupied space as much as possible.

[0204] In some embodiments, referring to Figures 8 to 9 , the distance between the side of the first insulating part 151 close to the first surface 17 and the first surface 17 is less than or equal to the distance between the side of the adapter 11 close to the first surface 17 and the first surface 17.

[0205] That is, the first insulating part 151 can cover the side of the adapter 11 close to the first surface 17, thereby being conducive to reducing the possibility of insulation failure between the adapter 11 and the shell 12.

[0206] In some embodiments, referring to Figures 10 to 11 , the first surface 17 is distributed on both sides of the battery monomer 10 along the thickness direction. The distance between the first insulating part 151 and the second insulating part 152 in the first direction is C, wherein the first direction intersects the thickness direction of the battery monomer 10.

[0207] That is, the distance between the first insulating part 151 and the second insulating part 152 in the first direction is less than or equal to 5 mm.

[0208] Here, the first direction is, for example, the length direction of the battery monomer 10.

[0209] The distance between the first insulating part 151 and the second insulating part 152 in the first direction is the interval between the first insulating part 151 and the second insulating part 152 in the length direction.

[0210] Exemplarily, the distance between the first insulating part 151 and the second insulating part 152 in the first direction can be a point value of any one of or a point value between any two of 0 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm.

[0211] In the embodiment in which the distance between the first insulating part 151 and the second insulating part 152 in the first direction is 0, the first insulating part 151 and the second insulating part 152 can be connected or intersected in the first direction.

[0212] It can be understood that the smaller the distance between the first insulating part 151 and the second insulating part 152 in the first direction, the larger the coverage area of the insulating piece 15; the larger the distance between the first insulating part 151 and the second insulating part 152 in the first direction, the more conducive to the assembly between the first insulating part 151 and the second insulating part 152.

[0213] In this embodiment, by setting the distance between the first insulating part 151 and the second insulating part 152 in the first direction to be less than or equal to 5 mm, the distance within this range is appropriate, which not only makes the insulating piece 15 reduce the occupied space as much as possible and improves the assembly efficiency, but also is conducive to improving the coverage area of the insulating piece 15 to the adapter 11.

[0214] In some embodiments, referring to Figures 10 to 12 , the battery monomer 10 further includes a second surface 18 on both sides of the first direction, and the distance between the side of the insulating piece 15 close to the second surface 18 and the second surface 18 is less than or equal to the distance between the side of the adapter 11 close to the second surface 18 and the second surface 18. Wherein, the first direction intersects the thickness direction of the battery monomer 10.

[0215] That is, the insulating piece 15 can cover the side of the adapter 11 close to the second surface 18.

[0216] It should be noted that the second surface 18 described in the embodiments of the present application is the side surface of the battery monomer 10.

[0217] Taking a square battery monomer 10 as an example, in the vertical state, the face formed by the length direction and the width direction of the battery monomer 10 is the bottom surface of the battery monomer 10, the face formed by the length direction and the height direction of the battery monomer 10 is the large surface of the battery monomer 10, and the face formed by the width direction and the height direction of the battery monomer 10 is the second surface 18 of the battery monomer 10.

[0218] In this embodiment, the insulating piece 15 can cover the side of the adapter 11 close to the second surface 18, thereby facilitating reducing the possibility of insulation failure between the adapter 11 and the shell 12.

[0219] In some embodiments, referring to Figure 4 , the shell 12 includes an end cover 122 and a shell body 121, the shell body 121 is provided with an opening, and the end cover 122 is provided on the opening. At least part of the insulating piece 15 is arranged between the adapter 11 and the end cover 122.

[0220] The at least partial insulation member 15 disposed between the adapter 11 and the end cap 122 means that the insulation member 15 can be disposed on the adapter 11, or on the end cap 122, or of course on the lower plastic 16 between the adapter 11 and the end cap 122.

[0221] That is, by disposing the additional insulation member 15 between the adapter 11 and the end cap 122, the possibility of a short circuit due to insulation failure between the adapter 11 and the end cap 122 is reduced to some extent, thereby improving the reliability of the battery monomer 10.

[0222] Here, even if a normal battery monomer 10 can be affected by heat from a thermal runaway battery monomer 10, causing insulation failure between the adapter 11 and the end cap 122 inside the normal battery monomer 10 (e.g. the lower plastic 16 is damaged), but because the additional insulation member 15 is disposed between the adapter 11 and the end cap 122, the adapter 11 will not be in direct contact with the end cap 122, thereby reducing the possibility of insulation failure between the adapter 11 and the end cap 122.

[0223] In some embodiments, referring to Figures 4 to 7 , the insulation member 15 includes a third insulation portion 153 and a fourth insulation portion 154, the third insulation portion 153 and the fourth insulation portion 154 are connected, the third insulation portion 153 is disposed between the adapter 11 and the end cap 122, and the fourth insulation portion 154 is disposed between the electrode assembly 14 and the case 121.

[0224] That is, the third insulation portion 153 is disposed between the adapter 11 and the end cap 122, one end of the fourth insulation portion 154 is connected to the third insulation portion 153, and the other end extends towards the bottom of the battery monomer 10.

[0225] Exemplarily, the first insulation portion 151 includes the third insulation portion 153 and the fourth insulation portion 154.

[0226] Exemplarily, the second insulation portion 152 includes the third insulation portion 153 and the fourth insulation portion 154.

[0227] It can be understood that after the battery monomer 10 is thermally runaway, heat is generated, which has a thermal effect on the adjacent battery monomer 10, whereby the electrode assembly 14 of the adjacent battery monomer 10 is heated to cause damage to the insulation layer on the outer surface, whereby by covering the electrode assembly 14 with the insulation member 15, the possibility of a short circuit due to insulation failure between the electrode assembly 14 and the case 121 is reduced.

[0228] In this embodiment, the insulation member 15 is provided with the third insulation part 153 and the fourth insulation part 154, the third insulation part 153 is arranged between the adapter 11 and the end cover 122, and the fourth insulation part 154 is arranged between the electrode assembly 14 and the case 121. In this way, the adapter 11 can be covered by the third insulation part 153, reducing the possibility of insulation failure between the adapter 11 and the end cover 122, and at least part of the electrode assembly 14 can be covered by the fourth insulation part 154, reducing the possibility of insulation failure between the electrode assembly 14 and the case 121.

[0229] In some embodiments, referring to Figures 13 to 15 , the shell 12 includes a plurality of surfaces, the plurality of surfaces includes the first surface 17, the first surface 17 is the largest surface in the plurality of surfaces, and the fourth insulation part 154 is arranged between the electrode assembly 14 and the first surface 17.

[0230] It can be understood that the arrangement direction of the battery cell 10 is generally perpendicular to the first surface 17, and the heat generated after the thermal runaway of the battery cell 10 has a greater thermal impact on the large surface of the adjacent battery cell 10. Therefore, the fourth insulation part 154 is preferably arranged between the electrode assembly 14 and the first surface 17.

[0231] For example, referring to Figure 15 , the battery cell 10 includes a lower plastic 16, the lower plastic 16 is arranged between the shell 12 and the electrode assembly 14, the side of the lower plastic 16 facing the electrode assembly 14 forms a groove, and the second connecting part 112 is bent towards the top of the battery cell 10 relative to the first connecting part 111 and extends into the groove.

[0232] In this embodiment, the side of the lower plastic 16 facing the electrode assembly 14 is provided with a groove, and the second connecting part 112 is bent towards the top of the battery cell 10 relative to the first connecting part 111 and extends into the groove. The groove can provide a space for the second connecting part 112, which is beneficial to improve the space utilization and structural compactness.

[0233] It should be noted that there are many ways to form the groove.

[0234] For example, referring to Figure 15 , at least part of the side wall of the end cover 122 away from the lower plastic 16 is protruding, so that the side wall of the lower plastic 16 corresponding to the protruding area near the electrode assembly 14 is recessed to form a recessed area.

[0235] In some embodiments, referring to Figure 15 Figure 15 , at least part of the side wall of the lower plastic 16 away from the electrode assembly 14 is protruding, so that the side wall of the lower plastic 16 corresponding to the side near the electrode assembly 14 is recessed to form a groove.

[0236] In this embodiment, the thickness of the groove wall is equal to the wall thickness of the lower plastic 16.

[0237] For example, by way of stamping, at least part of the side wall of the lower plastic 16 on the side away from the electrode assembly 14 is protruded, so that the side wall of the lower plastic 16 on the side corresponding to the side close to the electrode assembly 14 is recessed to form a groove.

[0238] It should be noted that the cross-sectional shape of the groove is not limited herein.

[0239] Here, the groove can have different cross-sectional shapes according to requirements.

[0240] For example, at least part of the side wall of the end cover 122 on the side away from the lower plastic 16 is protruded, so that the side wall of the lower plastic 16 on the side corresponding to the protruded area on the lower plastic 16 is recessed to form a recessed area.

[0241] In other embodiments, at least part of the side wall of the lower plastic 16 on the side close to the electrode assembly 14 is thinned to form a groove.

[0242] In this embodiment, at least part of the side wall of the lower plastic 16 on the side close to the electrode assembly 14 is thinned to form a groove, that is, the thickness of the groove wall is less than the wall thickness of other areas of the lower plastic 16.

[0243] For example, at least part of the side wall of the lower plastic 16 on the side close to the electrode assembly 14 is thinned to form a groove by machining processes such as milling and planing, and the groove formed by this machining method has high precision and is easy to form.

[0244] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application is included in the protection scope of the present application.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing; an electrode terminal provided in the housing; an electrode assembly provided in the housing, the electrode assembly being provided with a tab; an adapter, the tab being electrically connected to the electrode terminal through the adapter, the adapter comprising a first connecting portion and a second connecting portion, the first connecting portion being electrically connected to the electrode terminal, and the second connecting portion being electrically connected to the tab; an insulating member, at least part of the insulating member being provided between the adapter and the housing.

2. The battery cell of claim 1, wherein, At least part of the insulating member is attached to the adapter.

3. The battery cell of claim 1, wherein, At least part of the insulating member is attached to the housing.

4. The battery cell of claim 1, wherein, The melting point of the insulating member is T, .

5. The battery cell of claim 4, wherein, The energy density of the battery cell is E, and the relationship between E and T satisfies: ； 。 6. The battery cell of claim 1, wherein, The insulating member is a polyimide film, a polyethylene terephthalate film, a polypropylene film, a polyethylene film, a polyamide, a polyphthalamide film, or a polyphenylene sulfide film.

7. The battery cell of any one of claims 1-6, wherein, The insulating member comprises a first insulating portion and a second insulating portion, the first insulating portion being provided between the first connecting portion and the housing, and the second insulating portion being provided between the second connecting portion and the housing.

8. The battery cell of claim 7, wherein, The housing comprises a plurality of surfaces, the plurality of surfaces comprising a first surface, the first surface being the largest surface among the plurality of surfaces; the second connecting portion has a welding area, the welding area being electrically connected to the tab; The distance between the side away from the first surface of the second insulating portion and the first surface is A1, and the distance between the side away from the first surface of the welding area and the first surface is A2, .

9. The battery cell of claim 7, wherein, The second connecting portion has a welding area, the welding area being electrically connected to the tab, and the second insulating portion covering the welding area.

10. The battery cell of claim 7, wherein, The housing includes a plurality of surfaces, the plurality of surfaces including a first surface, the first surface being a largest surface among the plurality of surfaces; a distance between a side of the first insulating portion distal from the first surface and the first surface is B, .

11. The battery cell of claim 10, wherein, 。 12. The battery cell of claim 10, wherein, The distance between the side of the first insulating portion close to the first surface and the first surface is less than or equal to the distance between the side of the adapter close to the first surface and the first surface.

13. The battery cell of claim 7, wherein, The shell comprises a plurality of surfaces, the plurality of surfaces comprising a first surface, the first surface being a surface with the largest area among the plurality of surfaces, the first surface being distributed on both sides of the battery monomer along the thickness direction; the distance between the first insulation part and the second insulation part in the first direction is C, wherein the first direction intersects the thickness direction of the battery monomer.

14. The battery cell of any one of claims 1-6, wherein, The housing comprises a plurality of surfaces, the plurality of surfaces comprising a first surface, the first surface being the largest surface among the plurality of surfaces, and the first surface being distributed on both sides of the battery cell along the thickness direction; the battery cell further comprises a second surface on both sides along a first direction, the distance between the side of the insulating member close to the second surface and the second surface is less than or equal to the distance between the side of the adapter close to the second surface and the second surface; wherein the first direction intersects the thickness direction of the battery cell.

15. The battery cell of any one of claims 1-6, wherein, The thickness of the insulating piece is D, .

16. The battery cell of any one of claims 1-4, wherein, The housing comprises an end cover and a shell, the shell being provided with an opening, and the end cover being provided on the opening; at least part of the insulating member is provided between the adapter and the end cover.

17. The battery cell of claim 16, wherein, The insulating member comprises a third insulating portion and a fourth insulating portion, the third insulating portion and the fourth insulating portion being connected, the third insulating portion being provided between the adapter and the end cover, and the fourth insulating portion being provided between the electrode assembly and the shell.

18. The battery cell of claim 17, wherein, The housing comprises a plurality of surfaces, the plurality of surfaces comprising a first surface, the first surface being the largest surface among the plurality of surfaces, and the fourth insulating portion being provided between the electrode assembly and the first surface.

19. The battery cell of any one of claims 1-6, wherein, The battery cell comprises a lower plastic, the lower plastic being provided between the housing and the electrode assembly, and at least part of the insulating member being attached to the lower plastic.

20. The battery cell of claim 7, wherein, The battery cell comprises a lower plastic, which is arranged between the shell and the electrode assembly, a side of the lower plastic facing the electrode assembly is provided with a groove, and the second connecting portion is bent towards the top of the battery cell relative to the first connecting portion and extends into the groove.

21. The battery cell of claim 20, wherein, At least part of the side wall of the lower plastic away from the electrode assembly is protruded, so that the side wall of the lower plastic corresponding to the side close to the electrode assembly is recessed to form the groove; or at least part of the side wall of the lower plastic close to the electrode assembly is thinned to form the groove.

22. The battery cell of claim 7, wherein, The first and second insulation portions are in an integrated structure; and / or the first and second insulation portions are in a rectangular shape.

23. A battery device, characterized by A plurality of battery cells according to any one of claims 1-22.

24. An electrical device, comprising: A battery cell according to any one of claims 1-22 or a battery device according to claim 23, for storing or providing electric energy.

25. An energy storage device, comprising: A battery cell according to any one of claims 1-22 or a battery device according to claim 23, for storing or providing electric energy.

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