Battery cell, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, a first conductive part, a first pole and a first insulating part; the housing has a first wall. The first conductive part is arranged on the first wall and insulated from the first wall, and is provided with a first through hole along a first direction, and the first direction is the thickness direction of the first wall. The first pole is installed in the first through hole. At least part of the first insulating part is arranged on the inner side of the first wall. Wherein the first insulating part and the first conductive part are connected with each other. According to the technical scheme provided by the invention, the reliability of the battery device can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device and an electrical device. Background Art

[0002] With the development of new energy technology, batteries are being used more and more widely. Batteries have high energy density, high safety, long service life, and are green and environmentally friendly to the social environment. They have been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery swap stations, engineering manufacturing, smart equipment, etc. At the same time, they also promote technical development and research in communications, medical equipment, energy development, etc.

[0003] In the process of battery technology development, how to improve the reliability of battery devices is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The present application provides a battery cell, a battery device and an electrical device. The technical solution provided in the present application can effectively improve the reliability of the battery device.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, the battery cell comprising a housing, a first conductive member, a first pole and a first insulating member. The housing has a first wall. The first conductive member is disposed on the first wall and is insulated from the first wall. The first conductive member has a first through hole along a first direction, and the first direction is the thickness direction of the first wall. The first pole is installed in the first through hole. At least a portion of the first insulating member is disposed on the inner side of the first wall. The first insulating member is connected to the first conductive member.

[0006] In the above scheme, at least a portion of the first insulating member is arranged on the inner side of the first wall and the first insulating member and the first conductive member are interconnected, which can ensure high structural stability among the first insulating member, the first wall and the first conductive member, and reduce the risk of the first conductive member being displaced toward the outside of the first wall due to the internal pressure of the battery cell, causing the connection interface between the first conductive member and the first pole to loosen to produce a gap and thus cause electrolyte leakage, thereby effectively improving the reliability of the battery cell and further improving the reliability of the battery device.

[0007] According to some embodiments of the present application, the first insulating member includes a first part and a second part, the first part is arranged on the inner side of the first wall, the second part is arranged on the side of the first part facing the first conductive member, and the second part is at least partially located between the hole wall of the first through hole and the outer peripheral surface of the first pole, and the second part is interconnected with the hole wall of the first through hole.

[0008] In the above solution, the first insulating member includes a first portion and a second portion. On the one hand, the first portion can be used for insulating and isolating the electrode assembly and the first wall. The second portion is disposed in the first through hole, which can increase the connection area between the first insulating member and the first conductive member, and effectively improve the structural stability among the first wall, the first conductive member, and the first insulating member. On the other hand, by connecting the second portion to the first conductive member, the occupied space of the portion where the first insulating member and the first conductive member are interconnected inside the housing can be reduced, so as to reduce the impact on the volume energy density of the battery cell, making the volume energy density of the battery cell high, and further making the volume energy density of the battery device high.

[0009] According to some embodiments of the present application, along the circumferential direction of the first pole column, the second portion is an annular structure.

[0010] In the above solution, by disposing the second portion in an annular structure, the connection area between the first insulating member and the first conductive member is effectively increased, the structural stability among the first wall, the first conductive member, and the first insulating member is effectively improved, and thus the reliability of the battery device is improved.

[0011] According to some embodiments of the present application, the battery cell further includes a first sealing member, and the first sealing member is disposed in the first through hole and between the hole wall of the first through hole and the outer circumferential surface of the first pole column.

[0012] In the above solution, by providing the first sealing member to form a seal between the first pole column and the first conductive member, the risk of electrolyte leakage from the connection interface between the first pole column and the first conductive member is reduced, making the battery cell highly reliable and the battery device highly reliable.

[0013] According to some embodiments of the present application, a limiting portion is provided between the second portion and the hole wall of the first through hole for restricting the relative displacement of the first insulating member and the first conductive member along a first direction. Along the first direction, the first sealing member is located on a side of the limiting portion away from the first portion.

[0014] In the above solution, by providing a limiting portion between the second portion and the hole wall of the first through hole, on the one hand, the impact resistance of the first conductive member can be improved, effectively enabling the first conductive member to resist the pressure inside the battery cell, so that the first conductive member can maintain a relatively stable positional relationship with the first wall and the first pole column, thereby effectively reducing the risk of electrolyte leakage from the connection interface between the first pole column and the first conductive member, making the battery cell highly reliable, and further making the battery device highly reliable. On the other hand, when the first insulating member is subjected to the internal pressure of the battery cell, the first sealing member can be squeezed, thereby improving the sealing effect of the first sealing member and reducing the risk of electrolyte leakage.

[0015] According to some embodiments of the present application, the limiting portion includes a convex portion disposed on a side of the hole wall of the second portion facing the first through hole, and along the first direction, the convex portion has a first connecting surface facing the first portion. Along the first direction, the first through hole includes a first hole segment and a second hole segment arranged with each other, the first hole segment and the second hole segment are connected by a first step surface, and the first connecting surface is connected to the first step surface.

[0016] In the above scheme, the first through hole is set to a stepped hole shape to form a first step surface for cooperating with the protrusion, so that the first step surface and the first connecting surface of the protrusion abut against each other to jointly limit the relative position relationship between the first conductive part and the first wall in the first direction, thereby limiting the relative position relationship between the first conductive part and the first pole in the first direction, effectively reducing the risk of electrolyte leakage from the connection interface between the first pole and the first conductive part, so that the battery cell has a higher reliability, and then the battery device has a higher reliability.

[0017] According to some embodiments of the present application, the second part also includes a second connecting surface and a third connecting surface. Along the first direction, the second connecting surface is arranged opposite to the first connecting surface, the third connecting surface connects the first connecting surface and the second connecting surface, and the third connecting surface is arranged obliquely to the first connecting surface.

[0018] In the above scheme, by setting an inclined third connecting surface, the second part can be guided to be inserted into the first through hole in a direction pointing from the inner side of the first wall to the outer side, so that the first connecting surface and the first step surface abut against each other, thereby improving the assembly efficiency between the first insulating part, the first wall and the first conductive part, and further facilitating the improvement of the manufacturing efficiency of the battery device.

[0019] According to some embodiments of the present application, the first pole includes a first body, a first flange and a second flange. Along the first direction, the first flange and the second flange are respectively arranged at opposite ends of the first body, the first body is penetrated by the first through hole, the first flange is connected to the outer side of the first wall, and the second flange is located on the side of the first part away from the first wall.

[0020] In the above scheme, the first pole has a simple structure. By limiting the first flange and the second flange in the first direction, the first pole can be stably installed in the first through hole. At the same time, by setting the second flange to the side of the first part away from the first wall, the first part can be insulated and isolated from the second flange and the first wall, thereby improving the insulation performance of the first pole and the first wall, effectively reducing the risk of internal short circuit of the battery cell, and making the battery device highly reliable.

[0021] According to some embodiments of the present application, a first groove is formed on the outer side of the first conductive member, a first through hole is formed on the bottom surface of the first groove, and at least a portion of the first flange is disposed in the first groove.

[0022] In the above solution, by providing a first groove on the outer side of the first conductive member to accommodate at least a part of the first flange, the first pole can reasonably utilize the space where the first conductive member is located, so as to streamline the overall size of the battery cell, which is beneficial to improving the volume energy density of the battery cell, and further beneficial to improving the energy density of the battery device.

[0023] According to some embodiments of the present application, along the first direction, the first wall has a second through hole, and at least a part of the first conductive member is disposed in the second through hole; the battery cell further includes a second insulating member, and at least a part of the second insulating member is disposed between the hole wall of the second through hole and the first conductive member.

[0024] In the above solution, by providing the second insulating member, the first conductive member and the hole wall of the second through hole can be effectively insulated and isolated, reducing the risk of short circuit between the first wall and the first conductive member, which may cause internal short circuit of the battery cell, making the battery cell highly reliable, and further making the battery device highly reliable.

[0025] According to some embodiments of the present application, a second groove is formed on the outer side of the first wall, the second through hole is formed on the bottom surface of the second groove, and at least a part of the first conductive member is disposed in the second groove.

[0026] In the above solution, by providing a second groove on the outer side of the first wall to accommodate at least a part of the first conductive member, the first conductive member can reasonably utilize the space where the first wall is located, so as to streamline the overall size of the battery cell, which is beneficial to improving the volume energy density of the battery cell, and further beneficial to improving the energy density of the battery device.

[0027] According to some embodiments of the present application, the first conductive member includes a first conductive portion and a second conductive portion arranged along the first direction. At least a part of the first conductive portion is located in the second groove, and at least a part of the second conductive portion is located in the second through hole. The second insulating member includes a first insulating portion, a second insulating portion and a third insulating portion. The second insulating portion connects the first insulating portion and the third insulating portion. The first insulating portion is located between the side surface of the second groove and the first conductive portion, the second insulating portion is located between the bottom surface of the second groove and the first conductive portion, and the third insulating portion is located between the hole wall of the second through hole and the second conductive portion.

[0028] In the above solution, the second insulating member includes a first insulating portion, a second insulating portion and a third insulating portion. The first insulating portion, the second insulating portion and the third insulating portion are arranged along the outer contour of the first conductive member, which can effectively insulate and isolate the first conductive member and the first wall, and can improve the sealing performance between the first conductive member and the first wall, and can effectively reduce the risk of electrolyte leakage from the connection interface between the first wall and the first conductive member, making the battery cell highly reliable, and further making the battery device highly reliable.

[0029] According to some embodiments of the present application, the second insulating member further includes a fourth insulating portion, the fourth insulating portion is connected to an end of the third insulating portion facing away from the second insulating portion, and the fourth insulating portion is located between the first insulating member and the second conductive portion.

[0030] In the above solution, by providing the fourth insulating portion and the fourth insulating portion being located between the first insulating portion and the second conductive portion, on the one hand, it can achieve the effect of positioning and assembling the first conductive member, and on the other hand, it can form a seal at the contact portion between the first insulating member and the fourth insulating portion, effectively reducing the risk of electrolyte leakage from the connection interface between the first wall and the first conductive member, making the battery cell highly reliable, and further making the battery device highly reliable.

[0031] According to some embodiments of the present application, the battery cell further includes an electrode assembly and a first current collector member. The electrode assembly has a first tab. At least a part of the first current collector member is disposed on a side of the first insulating member facing away from the first wall, and the first tab and the first terminal are electrically connected through the first current collector member. The first current collector member includes a first connection segment, a second connection segment, and a third connection segment. The first tab is connected to the first connection segment, the first terminal is connected to the third connection segment, a first crease is formed between the first connection segment and the second connection segment, and a second crease is formed between the second connection segment and the third connection segment.

[0032] In the above technical solution, since the first current collector member includes a first connection segment, a second connection segment, and a third connection segment that are sequentially connected, and the three-segment structure can be folded with each other, on the one hand, it can reduce the assembly difficulty of the first current collector member, the first terminal, and the electrode assembly, improving the manufacturing efficiency of the battery cell; on the other hand, it provides the space utilization rate of the first current collector member, improving the volumetric energy density of the battery device.

[0033] In a second aspect, some embodiments of the present application further provide a battery device including the battery cell according to any one of the first aspects.

[0034] In a third aspect, some embodiments of the present application further provide an electrical device including the battery cell provided in the first aspect, or the battery device provided in the second aspect, and the battery cell is used to provide electrical energy.

[0035] The additional aspects and advantages of the present application will be partly given in the following description, partly will become apparent from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0037] Figure 1 Schematic diagram of the structure of a vehicle in some embodiments of the present application;

[0038] Figure 2 Exploded perspective view of a battery device in some embodiments of the present application;

[0039] Figure 3 Exploded perspective view of a battery cell in some embodiments of the present application;

[0040] Figure 4 Schematic diagram of the structure of a first wall and a first electrode terminal in some embodiments of the present application;

[0041] Figure 5 Schematic diagram of a first wall, a first insulating member, a first electrode terminal, and a first current collecting member in some embodiments of the present application;

[0042] Figure 6 Top view of a first wall and a first electrode terminal in some embodiments of the present application;

[0043] Figure 7 For Figure 6 Cross-sectional view taken along the A-A viewing direction in

[0044] Figure 8 For Figure 7 Enlarged view at B in

[0045] Figure 9 Schematic diagram of a first insulating member in some embodiments of the present application;

[0046] Figure 10 For Figure 7 Enlarged view at C in

[0047] Figure 11 Schematic diagram of a first conductive member in some embodiments of the present application.

[0048] Icons: 1000 - electrical device; 100 - battery device; 400 - controller; 300 - motor; 200 - housing; 200a - first housing part; 200b - second housing part; 10 - battery cell; 20 - outer shell; 21 - first wall; 21a - liquid injection hole; 21b - pressure relief mechanism; 210 - second through hole; 211 - second groove; 22 - housing body; 23 - second end cap; 30 - electrode assembly; 40 - first electrode terminal; 41 - first conductive member; 410 - first through hole; 4100 - first hole section; 4101 - second hole section; 4102 - first stepped surface; 411 - first groove; 412 - first conductive part; 413 - second conductive part; 42 - first pole; 420 - first body; 421 - first flange; 422 - second flange; 50 - second electrode terminal; 60 - first insulating member; 61 - first part; 62 - second part; 620 - limiting part; 621 - convex part; 622 - first connection surface; 623 - second connection surface; 624 - third connection surface; 63 - first through hole; 70 - second insulating member; 71 - first insulating part; 72 - second insulating part; 73 - third insulating part; 74 - fourth insulating part; 80 - first sealing member; 90 - first current collector member; 91 - first connection section; 92 - second connection section; 93 - third connection section; 94 - first crease; 95 - second crease; z - first direction. Detailed implementation manners

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0051] References to "embodiments" in this application mean that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0052] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0053] The term " / and" in this application is merely a relational term describing the associated objects, indicating that three relationships can exist. For example, A / and B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0054] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed descriptions of the same components are omitted. It should be understood that the thicknesses, lengths, widths, etc. of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0055] The term "a plurality of" that appears in this application refers to two or more (including two).

[0056] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging to continue use after the battery cell discharges.

[0057] 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of this application are not limited thereto.

[0058] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0059] 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 provided on at least one surface of the positive electrode current collector.

[0060] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0061] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0062] In some embodiments, the separator is a separator membrane. The types of the separator membrane can be various, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0063] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like or solid. Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0064] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0065] In some embodiments, the electrode assembly is a stacked structure.

[0066] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0067] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0068] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0069] As an example, multiple separators can be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0070] As an example, the separator can be continuously provided and is disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0071] In some embodiments, the shape of the electrode assembly can be cylindrical, flat or prismatic, etc.

[0072] In some embodiments, the electrode assembly is provided with tabs, and the tabs can lead the current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0073] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as an electrode assembly and an electrolyte. 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 housing), or an aluminum-plastic film, etc.

[0074] 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 includes, but is not limited to, a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc.

[0075] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0076] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; 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 to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0077] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0078] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0079] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0080] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. The term "closed" here means covered or closed, and it can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0081] As an example, the box body may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0082] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beams and longitudinal beams of the vehicle.

[0083] In some embodiments, the battery device may refer to an energy storage device, which includes a box body with a door provided on at least one side thereof. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0084] The battery device has prominent advantages such as high energy density, low environmental pollution, high power density, long service life, wide application range, and small self-discharge coefficient, and is an important part of the development of new energy today. The development of battery technology needs to consider various design factors simultaneously, such as performance parameters like cycle life, discharge capacity, charge-discharge rate, etc. In addition, the energy density and reliability of the battery device also need to be considered.

[0085] In battery technology, a battery cell includes a housing, an electrode assembly, and electrode terminals. The electrode terminals can include a positive electrode terminal and a negative electrode terminal. Generally, the electrode terminals are insulated and installed on the wall of the housing. One end of the electrode terminals inside the housing is electrically connected to the electrode assembly, and the end outside the housing is used to connect to an external busbar component to achieve the input and output of electric energy. In related technologies, the electrode terminals can include a conductive member and a pole column. The conductive member is used to connect to an external busbar component, and the pole column is used to connect to the electrode assembly. Generally, the conductive member and the pole column can be connected by riveting. For example, the conductive member is formed with a through hole, and the pole column passes through the through hole and is riveted to the conductive member.

[0086] However, as the number of charge-discharge cycles of the battery cell increases, the battery cell will generate gas due to electrochemical reactions, causing the internal pressure of the battery cell to gradually increase. The internal pressure of the battery cell will act on the electrode terminals, and the conductive member will be impacted and displaced, resulting in loosening of the connection interface between the conductive member and the pole column and generating a gap, leading to the problem of electrolyte leakage, affecting the reliability of the battery cell, and further affecting the reliability of the battery device.

[0087] In view of this, to reduce the risk of electrolyte leakage caused by the loosening of the connection interface between the conductive member and the pole column and generating a gap, some embodiments of the present application provide a battery cell, which includes a housing, a first pole column, and a first insulating member. The housing has a first wall. The first conductive member is disposed on the first wall and is insulated from the first wall. Along the first direction z (the first direction z is the thickness direction of the first wall), the first conductive member has a first through hole. The first pole column is installed in the first through hole. At least part of the first insulating member is disposed inside the first wall. Among them, the first insulating member is connected to the first conductive member.

[0088] In the above solution, at least a part of the first insulating member is disposed inside the first wall and the first insulating member is connected to the first conductive member, which can make the structural stability among the first insulating member, the first wall and the first conductive member high, reduce the displacement of the first conductive member to the outside of the first wall due to the internal pressure of the battery cell, and prevent the connection interface between the first conductive member and the first pole from loosening to generate a gap, thereby avoiding the risk of electrolyte leakage. Therefore, the reliability of the battery cell can be effectively improved, and further the reliability of the battery device can be improved.

[0089] The battery device disclosed in the embodiments of the present application can be used in, but not limited to, power-consuming devices such as vehicles, ships or aircraft. A power supply system of the power-consuming device can be composed of the battery device disclosed in the present application. In this way, it is beneficial to alleviate the problem of short circuit occurring during the use of the battery device, improve the reliability of the battery device, and also beneficial to improve the volume energy density of the battery device and extend the working time of the power-consuming device.

[0090] The embodiments of the present application provide a power-consuming device using a battery device as a power source. The power-consuming device can be, but not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecrafts, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric aircraft toys, etc. The spacecrafts can include airplanes, rockets, space shuttles and spaceships, etc.

[0091] For the convenience of description, the following embodiments take a power-consuming device 1000 of an embodiment of the present application as a vehicle as an example for description.

[0092] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc. A battery device 100 is disposed inside the vehicle. The battery device 100 can be disposed at the bottom of the vehicle, or at the head of the vehicle, or at the tail of the vehicle. The battery device 100 can be used to supply power to the vehicle. For example, the battery device 100 can be used as an operating power source or a power source of the vehicle. The vehicle may further include a controller 400 and a motor 300. The controller 400 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle.

[0093] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source or a power source of the vehicle, but also be used as a driving power source of the vehicle to provide driving power for the vehicle instead of or partially replacing fuel or natural gas.

[0094] Please refer to Figure 2 , Figure 2 , which is an exploded perspective view of the battery device 100 in some embodiments of the present application.

[0095] The battery device 100 includes battery cells 10 and a housing 200, and the battery cells 10 are accommodated in the housing 200. Among them, the housing 200 is used to provide an accommodation space for the battery cells 10, and the housing 200 can adopt various structures. In some embodiments, the housing 200 may include a first housing part 200a and a second housing part 200b, the first housing part 200a and the second housing part 200b cover each other, and the first housing part 200a and the second housing part 200b jointly define an accommodation space for accommodating the battery cells 10. The second housing part 200b may be a hollow structure with one end open, the first housing part 200a may be a plate-like structure, and the first housing part 200a covers the open side of the second housing part 200b so that the first housing part 200a and the second housing part 200b jointly define an accommodation space; the first housing part 200a and the second housing part 200b may also both be hollow structures with one side open, and the open side of the first housing part 200a covers the open side of the second housing part 200b. Of course, the housing 200 formed by the first housing part 200a and the second housing part 200b can be of various shapes, such as a cylinder, a cuboid, etc.

[0096] In the battery device 100, the number of battery cells 10 may be one or more, and each battery cell 10 may be fixed to the housing 200 through a connecting member (such as a bolt), or each battery cell 10 may be fixed to the housing 200 by bonding.

[0097] Some embodiments of the present application provide a battery cell 10. Please refer to Figures 3 - 7 , Figure 3 , which is an exploded perspective view of the battery cell 10 in some embodiments of the present application, Figure 4 , which is a schematic structural view of the first wall 21 and the first electrode terminal 40 in some embodiments of the present application, Figure 5 , which is a schematic view of the first wall 21, the first insulating member 60, the first electrode terminal 40, and the first current collecting member 90 in some embodiments of the present application, Figure 6 , which is a top view of the first wall 21 and the first electrode terminal 40 in some embodiments of the present application, Figure 7 is Figure 6 a cross-sectional view taken along the A-A viewing direction in

[0098] The battery cell 10 includes a housing 20, a first conductive member 41, a first pole 42 and a first insulating member 60. The housing 20 has a first wall 21. The first conductive member 41 is disposed on the first wall 21 and is insulated from the first wall 21. The first conductive member 41 has a first through hole 410 along a first direction z, and the first direction z is the thickness direction of the first wall 21. The first pole 42 is installed in the first through hole 410. At least part of the first insulating member 60 is disposed on the inner side of the first wall 21. The first insulating member 60 and the first conductive member 41 are connected to each other.

[0099] The housing 20 is a component for accommodating the electrode assembly 30 , and the housing 20 may also be used to accommodate electrolytes, such as electrolyte solution.

[0100] Optionally, in some embodiments, see Figure 3 , the housing 20 includes a shell 22 and an end cap. A housing cavity is formed inside the shell 22, and the housing cavity is used to accommodate the electrode assembly 30. The shell 22 has an opening connected to the housing cavity. The end cap is covered at the opening of the shell 22 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 30 and the electrolyte. The end cap can be connected to the shell 22 by welding, bonding, clamping or other connection methods. Optionally, the shell 22 can be a structural member with an opening at one end, and the number of end caps is one, and the one end cap closes the opening of the shell 22. Optionally, openings are formed at both ends of the shell 22, respectively, and the end caps can include a first end cap and a second end cap 23, the first end cap closes one of the openings of the shell 22, and the second end cap 23 closes the other opening of the shell 22. In some embodiments, the end caps can be used to install electrode terminals, and the electrode terminals can include a first electrode terminal 40 and a second electrode terminal 50 with opposite polarities, for example, the first electrode terminal 40 is a positive electrode, and the second electrode terminal 50 is a negative electrode.

[0101] In some embodiments, the end cap may also be provided with a liquid injection hole or a pressure relief mechanism. The liquid injection hole is used to inject electrolyte into the housing 20. The pressure relief mechanism is used to release the pressure inside the battery cell 10 to reduce the risk of thermal runaway or explosion of the battery cell 10. Optionally, the pressure relief mechanism may be a pressure relief valve or notch provided on the end cap. Optionally, the first end cap is provided with a positive electrode terminal, a liquid injection hole and a pressure relief mechanism. The second end cap 23 is provided with a negative pressure electrode terminal and a pressure relief mechanism. For example, see Figure 4 , Figure 5 as well as Figure 6 , showing the liquid injection hole 21a and the pressure relief mechanism 21b.

[0102] In some embodiments, the material of the outer shell 20 can be metal or a combination of metal and non-metal. For example, the outer shell 20 can be made of metal, such as aluminum, copper, iron, aluminum, steel, or aluminum alloy, etc. Or, for another example, part of the outer shell 20 can be made of metal, and the remaining part can be made of non-metal. For example, the end cap of the outer shell 20 can be made of metal, and the housing 22 or other parts of the outer shell 20 can be made of non-metallic materials.

[0103] In some embodiments, the outer shell 20 can be a sealed structure or a non-sealed structure. As an example, when the outer shell 20 is a non-sealed structure, it only serves to protect the electrode assembly 30. The battery cell 10 includes a seal for encapsulating components such as the electrode assembly 30 and the electrolyte. The outer shell 20 is disposed outside the seal to protect the electrode assembly 30 or to limit the expansion of the electrode assembly 30. Specifically, the seal can be a bag-shaped insulating member or an aluminum-plastic film, which is wrapped outside the electrode assembly 30 and is used to insulate the electrode assembly 30 and the outer shell 20.

[0104] In some embodiments, when assembling the battery cell 10, the electrode assembly 30 can be first placed into the housing 22, and the electrolyte can be filled into the housing 22, and then the end cap is covered on the opening of the housing 22 to complete the assembly of the battery cell 10. Or, in some embodiments, when assembling the battery cell 10, the electrode assembly 30 can be first placed into the housing 22, then the end cap is covered on the opening of the housing 22, and then the electrolyte is filled into the housing 22 through the liquid injection hole on the end cap, and then the liquid injection hole is sealed to complete the assembly of the battery cell 10.

[0105] The outer shell 20 can be of various shapes, such as a cylindrical shape or a prismatic structure, etc. The shape of the outer shell 20 can be determined according to the specific shape of the electrode assembly 30. For example, if the electrode assembly 30 is a cylindrical structure, the outer shell 20 of a cylindrical structure can be selected. If the electrode assembly 30 is a flat structure, the outer shell 20 can be square. Some embodiments of the present application are described by taking the outer shell 20 as a cylinder as an example.

[0106] The first wall 21 is part of the structure of the outer shell 20. In some embodiments, the first wall 21 can be part of the housing 22, such as the side wall or the bottom wall of the housing 22. In some embodiments, please refer to Figure 3 , in some embodiments, the first wall 21 can be the end cap. Optionally, the first wall 21 can be the first end cap.

[0107] In some embodiments, the first wall 21 can be used to carry and support the first electrode terminal 40, and the first electrode terminal 40 can be connected to an external busbar component to realize the input and output of electric energy. The external busbar component can be a tab.

[0108] In some embodiments of the present application, the first electrode terminal 40 is disposed on the first end cover, and the second electrode terminal 50 is disposed on the second end cover 23 as an example. The structural relationship between the first electrode terminal and the first wall 21 is described below, and the structural relationship between the second electrode terminal 50 and the second end cover 23 can be referred to accordingly.

[0109] The first electrode terminal 40 is a component installed on the first wall 21. The first electrode terminal 40 is used to electrically connect to the electrode assembly 30, so that the current flows into or flows out of the first electrode tab through the first electrode terminal 40. The polarity of the first electrode terminal 40 and the first electrode tab is the same. In some embodiments, the first electrode terminal 40 is made of a metal material, for example, made of aluminum, copper, iron, aluminum, steel, alloy or composite metal. In some embodiments, the first electrode terminal 40 can be connected to the first electrode tab through a first current collecting member 90. Exemplarily, the first electrode tab of the electrode assembly 30 is composed of a plurality of first sub-electrode tabs stacked, and one end of the first current collecting member 90 can be welded to the first electrode tab, and then the other end of the first current collecting member 90 can be welded to the first electrode terminal 40, or one end of the first current collecting member 90 can be welded to the first electrode terminal 40, and then the other end of the first current collecting member 90 can be welded to the first electrode tab.

[0110] In some embodiments, the first electrode terminal 40 includes a first conductive member 41 and a first pole 42. At least a portion of the first conductive member 41 is located on the side of the first wall 21 away from the electrode assembly 30. The first conductive member 41 is used to connect to an external current collecting component (e.g., a bar sheet). In some embodiments, the first conductive member 41 is generally plate-shaped and may be a riveted sheet. A portion of the first pole 42 is located inside the housing 20, and the first pole 42 may be electrically connected to the first pole ear of the electrode assembly 30, for example, the first pole 42 is connected to the first pole ear through the first current collecting member 90, and the end of the first pole 42 away from the electrode assembly 30 may be connected to the first conductive portion 412.

[0111] In some embodiments of the present application, the first conductive member 41 has a first through hole 410, and the first through hole 410 can be a riveted hole that penetrates the first conductive member 41 along the first direction z. The first direction z is the thickness direction of the first wall 21. One end of the first pole 42 that is away from the electrode assembly 30 is riveted in the first through hole 410. Optionally, flanges are formed at opposite ends of the first conductive member 41 along the first direction z, respectively, to act on the outer side and the inner side of the first conductive member 41 in the first direction z, thereby limiting the displacement of the first pole 42 relative to the first conductive member 41.

[0112] The first insulating member 60 is an insulating component disposed inside the first wall 21, and can be used to insulate and isolate the electrode assembly 30 and the first wall 21. In some embodiments, a part of the first insulating member 60 may also be located between the first pole 42 and the first through hole 410. Exemplarily, the first insulating member 60 can be made of a material with a relatively high resistance value, such as an organic insulating material, an inorganic insulating material, or a hybrid insulating material, etc. Optionally, in some embodiments of the present application, the material of the first insulating member 60 may include an insulating PPS (polyphenylene sulfide) material. In some other embodiments, the first insulating member 60 can also be made of other materials with insulating properties, such as polypropylene, polyethylene, etc.

[0113] "The first insulating member 60 is interconnected with the first conductive member 41" can be understood as that the first insulating member 60 is connected to the inner side of the first wall 21 and is interconnected with the first conductive member 41, enabling the integration of the first insulating member 60, the first wall 21, and the first conductive member 41 into one body, effectively improving the structural stability between the first conductive member 41 and the first wall 21, and thus being able to limit the displacement of the first conductive member 41 in the first direction z.

[0114] The connection relationship between the first insulating member 60 and the first conductive member 41 can be diverse. For example, the first insulating member 60 and the first conductive member 41 can be connected by welding, bonding, snap - fitting, or threaded members. Optionally, a concavo - convex structure is provided between the first insulating member 60 and the first conductive member 41, and the abutting surface of the concavo - convex structure is perpendicular to the first direction z, so as to enable the relative stability of the positional relationship among the first conductive member 41, the first wall 21, and the first insulating member 60 in the first direction z.

[0115] In some embodiments, a part of the first insulating member 60 is located inside the first wall 21, and a part of the first insulating member 60 is located inside the first conductive member 41 and is connected to the first conductive member 41.

[0116] In the above - mentioned solution, at least a part of the first insulating member 60 is disposed inside the first wall 21 and the first insulating member 60 is interconnected with the first conductive member 41, which can make the structural stability among the first insulating member 60, the first wall 21, and the first conductive member 41 high, reducing the risk that the first conductive member 41 displaces outward from the first wall 21 due to the internal pressure of the battery cell 10, resulting in the loosening of the connection interface between the first conductive member 41 and the first pole 42 to generate a gap and thus causing electrolyte leakage. Thereby, the reliability of the battery cell 10 can be effectively improved, and further the reliability of the battery device 100 can be improved.

[0117] According to some embodiments of the present application, please refer to Figure 8 and Figure 9 , Figure 8 is Figure 7 an enlarged view of B in Figure 9Schematic diagram of the first insulating member 60 in some embodiments of the present application.

[0118] The first insulating member 60 includes a first portion 61 and a second portion 62. The first portion 61 is disposed inside the first wall 21, and the second portion 62 is disposed on a side of the first portion 61 facing the first conductive member 41. And at least a part of the second portion 62 is located between the inner wall of the first through hole 410 and the outer peripheral surface of the first pole 42, and the second portion 62 is connected to the first conductive member 41.

[0119] In some embodiments, the first insulating member 60 includes a first portion 61 and a second portion 62. The first portion 61 may be the main body portion of the first insulating member 60. The first portion 61 is located inside the first wall 21 and can insulate and isolate the electrode assembly 30 and the first wall 21. Along the first direction z, the first portion 61 has an opposite upper surface and a lower surface, and the lower surface faces the electrode assembly 30, and the second portion 62 is disposed on the upper surface.

[0120] "At least a part of the second portion 62 is located between the inner wall of the first through hole 410 and the outer peripheral surface of the first pole 42" can be understood as that all or part of the second portion 62 is located between the inner wall of the first through hole 410 extending into the first through hole 410 and the first pole 42 to insulate and isolate the inner wall of the first through hole 410 and the first pole 42.

[0121] "The second portion 62 is connected to the inner wall of the first through hole 410" can be understood as that the portion of the first insulating member 60 disposed in the first through hole 410 is connected to the first conductive member 41. The connection relationship between the second portion 62 and the inner wall of the first through hole 410 can be diverse. For example, the connection relationship between the second portion 62 and the inner wall of the first through hole 410 includes but is not limited to bonding, welding, clamping or connection by a threaded member.

[0122] Optionally, in some embodiments, a convex portion 621 is formed on a side of the second portion 62 facing the inner wall of the first through hole 410, and an abutting surface for cooperating with the convex portion 621 is formed on the inner wall of the first through hole 410, and the convex portion 621 and the abutting surface abut against each other in the first direction z.

[0123] In the above scheme, the first insulating member 60 includes a first part 61 and a second part 62. On the one hand, the first part 61 can be used to insulate and isolate the electrode assembly 30 and the first wall 21. The second part 62 is arranged in the first through hole 410 to increase the connection area between the first insulating member 60 and the first conductive member 41, and can effectively improve the structural stability between the first wall 21, the first conductive member 41 and the first insulating member 60; on the other hand, by connecting the second part 62 to the first conductive member 41, the portion of the first insulating member 60 and the first conductive member 41 that is interconnected can reduce the occupation of the internal space of the outer shell 20, so as to reduce the impact on the volume energy density of the battery cell 10, so that the volume energy density of the battery cell 10 is high, and then the volume energy density of the battery device 100 is high.

[0124] According to some embodiments of this application, see Figure 9 Along the circumference of the first pole 42 , the second portion 62 is an annular structure.

[0125] The circumferential direction of the first pole 42 may be a direction surrounding the axial direction of the first pole 42. In some embodiments, the first insulating member 60 is generally in a disc-shaped structure, corresponding to the cylindrical housing 20. A first through hole 63 is formed in the middle of the first portion 61 of the first insulating member 60, and the first through hole 63 is for the first pole 42 to pass through. The second portion 62 surrounds the edge of the first through hole 63 and protrudes toward a side away from the inside of the housing 20.

[0126] In the above solution, by setting the second portion 62 in the annular structure, the connection area between the first insulating member 60 and the first conductive member 41 is effectively increased, and the structural stability between the first wall 21, the first conductive member 41 and the first insulating member 60 is effectively improved, thereby improving the reliability of the battery device 100.

[0127] In some other embodiments of the present application, the second portion 62 may further include a plurality of sub-portions, and the plurality of sub-portions may be spaced apart along the edge of the first through hole 63 , that is, the plurality of sub-portions may be spaced apart around the outer circumference of the first pole 42 .

[0128] According to some embodiments of this application, see Figure 5 and Figure 8 The battery cell 10 further includes a first seal 80 , which is disposed in the first through hole 410 and between the hole wall of the first through hole 410 and the outer peripheral surface of the first pole 42 .

[0129] The first sealing member 80 may be a sealing structural member. For example, the first sealing member 80 is a sealing ring that is squeezed to deform so as to form a seal.

[0130] Optionally, see Figure 8The first seal 80 is in the first through hole 410 , and the first seal 80 can contact the first pole 42 and the first conductive member 41 . When the first pole 42 is assembled to the first conductive member 41 , the assembly force between the two can cause compression to the first seal 80 .

[0131] Optionally, the first pole 42 includes a first main body 420 and a first flange 421, the first main body 420 is inserted into the first through hole 410, the first flange 421 can abut against the first conductive member 41 to limit the position of the first pole 42 along the first direction z, the first seal 80 can contact the outer periphery of the first main body 420, the first seal 80 can contact the side of the first flange 421 facing the inside of the shell 20, and the first seal 80 can contact the hole wall of the first through hole 410.

[0132] In the above scheme, the first seal 80 is provided to form a seal between the first pole 42 and the first conductive member 41, thereby reducing the risk of electrolyte leakage from the connection interface between the first pole 42 and the first conductive member 41, so that the reliability of the battery cell 10 is high and the reliability of the battery device 100 is high.

[0133] According to some embodiments of this application, see Figure 8 A limiting portion 620 is provided between the second portion 62 and the hole wall of the first through hole 410 to limit the relative displacement of the first insulating member 60 and the first conductive member 41 along the first direction z. Along the first direction z, the first sealing member 80 is located on the side of the limiting portion 620 away from the first portion 61 .

[0134] In some embodiments, the limiting portion 620 can be arranged on the side of the second portion 62 facing the hole wall of the first through hole 410, or the limiting portion 620 can be arranged on the portion of the hole wall of the first through hole 410 facing the second portion 62, or a portion of the limiting portion 620 can be arranged on the side of the second portion 62 facing the hole wall of the first through hole 410, and the other portion is arranged on the corresponding portion of the hole wall of the first through hole 410.

[0135] Optionally, the limiting portion 620 can be arranged on a convex portion 621 on the side of the hole wall of the second part 62 facing the first through hole 410. Correspondingly, the hole wall of the first through hole 410 has a concave portion abutting against the convex portion 621. The surface where the convex portion 621 and the concave portion abut against each other can be perpendicular to the first direction z, or inclined to the first direction z.

[0136] In the above solution, by providing a limiting portion 620 between the second part 62 and the inner wall of the first through hole 410, on the one hand, the impact resistance of the first conductive member 41 can be improved, effectively enabling the first conductive member 41 to resist the pressure inside the battery cell 10, so that the first conductive member 41 can maintain a relatively stable positional relationship with the first wall 21 and the first pole 42, thereby effectively reducing the risk of electrolyte leakage from the connection interface between the first pole 42 and the first conductive member 41, making the battery cell 10 have high reliability, and further making the battery device 100 have high reliability; on the other hand, when the first insulating member 60 is affected by the internal pressure of the battery cell 10, it can squeeze the first sealing member 80, thereby improving the sealing effect of the first sealing member 80 and reducing the risk of electrolyte leakage.

[0137] According to some embodiments of the present application, please refer to Figure 8 , the limiting portion 620 includes a convex portion 621 provided on the side of the second part 62 facing the inner wall of the first through hole 410. Along the first direction z, the convex portion 621 has a first connection surface 622 facing the first part 61. Along the first direction z, the first through hole 410 includes a first hole segment 4100 and a second hole segment 4101 arranged in sequence. The first hole segment 4100 and the second hole segment 4101 are connected by a first step surface 4102, and the first connection surface 622 is connected to the first step surface 4102.

[0138] In some embodiments, the first through hole 410 may be a stepped hole, including a first hole segment 4100 and a second hole segment 4101 arranged along the first direction z. The first hole segment 4100 is located outside the housing 20 compared to the second hole segment 4101. The inner diameter of the first hole segment 4100 is larger than the inner diameter of the second hole segment 4101. The first pole 42 can pass through the second hole segment 4101. A part of the second part 62 can be located between the second hole segment 4101 and the first pole 42, and a part of the second part 62 can be located between the first hole segment 4100 and the first pole 42. The first hole segment 4100 and the second hole segment 4101 are connected by a first step surface 4102.

[0139] In some embodiments, along the radial direction of the first pole 42, the limiting portion 620 includes a convex portion 621 provided on the side of the second part 62 facing away from the first pole 42. Along the first direction z, the first connection surface 622 of the convex portion 621 facing the inside of the housing 20 abuts against the first step surface 4102.

[0140] In some embodiments, the first connection surface 622 and the first step surface 4102 are parallel to each other and fit together. The first connection surface 622 and the first step surface 4102 can be perpendicular to the first direction z or inclined to the first direction z.

[0141] In the above solution, the first through hole 410 is arranged in a stepped hole shape so as to be able to form a first stepped surface 4102 for cooperating with the convex portion 621, so that the first stepped surface 4102 and the first connection surface 622 of the convex portion 621 are abutted against each other to jointly limit the relative positional relationship between the first conductive member 41 and the first wall 21 in the first direction z, thereby limiting the relative positional relationship between the first conductive member 41 and the first pole column 42 in the first direction z, effectively reducing the risk of electrolyte leakage from the connection interface between the first pole column 42 and the first conductive member 41, making the battery cell 10 have high reliability, and further making the battery device 100 have high reliability.

[0142] According to some embodiments of the present application, the second portion 62 further includes a second connection surface 623 and a third connection surface 624. Along the first direction z, the second connection surface 623 is disposed opposite to the first connection surface 622, the third connection surface 624 connects the first connection surface 622 and the second connection surface 623, and the third connection surface 624 is inclined with respect to the first connection surface 622.

[0143] In some embodiments, along the radial direction of the first pole column 42, the size of the first connection surface 622 is larger than the size of the second connection surface 623.

[0144] In some embodiments, the convex portion 621 may be generally frustum-shaped, and the end with a smaller size of the convex portion 621 is farther from the inside of the housing 20 than the end with a larger size. In some embodiments, the second connection surface 623 and the third connection surface 624 may form the end with a smaller size of the convex portion 621, and the third connection surface 624 and the first connection surface 622 may form the end with a larger size of the convex portion 621.

[0145] In some embodiments, the third connection surface 624 may be used as a guiding surface. When assembling the first insulating member 60 and the first conductive member 41, referring to Figure 7 , the second portion 62 of the first insulating member 60 can be inserted into the first through hole 410 from bottom to top.

[0146] In the above solution, by providing the inclined third connection surface 624, the second portion 62 can be guided to be inserted into the first through hole 410 along the direction from the inside to the outside of the first wall 21, so that the first connection surface 622 and the first stepped surface 4102 are abutted against each other, thereby improving the assembly efficiency among the first insulating member 60, the first wall 21, and the first conductive member 41, and further facilitating the improvement of the manufacturing efficiency of the battery device 100.

[0147] According to some embodiments of the present application, please refer to Figure 5 and Figure 7The first pole 42 includes a first body 420, a first flange 421 and a second flange 422. Along the first direction z, the first flange 421 and the second flange 422 are respectively arranged at opposite ends of the first body 420. The first body 420 is penetrated by the first through hole 410. The first flange 421 is connected to the outer side of the first wall 21, and the second flange 422 is located on the side of the first part 61 away from the first wall 21.

[0148] The first pole 42 includes a first flange 421, a first body 420, and a second flange 422 arranged along a first direction z. In some embodiments, the first body 420 may be substantially cylindrical, polyhedral, or other shapes, and the first body 420 may be inserted into the first through hole 410 and the first through hole 63. The size of the first flange 421 is larger than the size of the first body 420, and the outer contour of the first flange 421 may be a strip, a disc, a square, or other shapes. The size of the second flange 422 is larger than the size of the first body 420, and the outer contour of the first flange 421 may be a strip, a disc, a square, or other shapes.

[0149] In some embodiments, the first flange 421 is located at one end of the first body 420 facing away from the inside of the housing 20, and the first flange 421 can abut against the outer side of the first conductive member 41 to limit the position of the first body 420 toward the inside of the housing 20 along the first direction z. The second flange 422 is located at one end of the first body 420 facing the inside of the housing 20, and the second flange 422 can abut against the inner side of the first conductive member 41. Optionally, part of the first insulating member 60 can be located between the second flange 422 and the inner side of the first conductive member 41. For example, the outer edge of the first part 61 is connected to the inner side of the first wall 21, the middle part of the first part 61 is between the first conductive member 41 and the second flange 422, and the second part 62 is between the hole wall of the first through hole 410 and the first body 420.

[0150] In the above scheme, the first pole 42 has a simple structure. By limiting the first flange 421 and the second flange 422 in the first direction z, the first pole 42 can be stably installed in the first through hole 410. At the same time, by setting the second flange 422 to the side of the first part 61 away from the first wall 21, the first part 61 can be insulated and isolated from the second flange 422 and the first wall 21, thereby improving the insulation performance of the first pole 42 and the first wall 21, effectively reducing the risk of internal short circuit of the battery cell 10, and making the battery device 100 highly reliable.

[0151] According to some embodiments of the present application, a first groove 411 is formed on the outer side of the first conductive member 41 , a first through hole 410 is formed at the bottom surface of the first groove 411 , and at least a portion of the first flange 421 is disposed in the first groove 411 .

[0152] In some embodiments, a first groove 411 is formed on the outer side of the first conductive member 41, and the first groove 411 can accommodate at least part of the first flange 421. The bottom of the first groove 411 forms a first through hole 410 for the first body 420 to pass through. Optionally, the first flange 421 is entirely located in the first groove 411, that is, the side of the first flange 421 that is away from the first body 420 does not exceed the first groove 411. Optionally, part of the first flange 421 is located in the first groove 411, and part of the first flange 421 exceeds the first groove 411, that is, part of the first flange 421 exceeds the outer side of the first conductive member 41.

[0153] In some embodiments, the bottom surface of the first groove 411 is connected to the first hole section 4100, the lower surface of the first flange 421 abuts against the bottom surface of the first groove 411, and the first seal 80 is located between the first hole section 4100, the lower surface of the first flange 421, the outer peripheral surface of the first body 420 and the upper surface of the second part 62.

[0154] In the above scheme, by setting the first groove 411 on the outer side of the first conductive member 41 to accommodate at least a portion of the first flange 421, the first pole 42 can reasonably utilize the space where the first conductive member 41 is located, so as to simplify the overall size of the battery cell 10, which is beneficial to the improvement of the volume energy density of the battery cell 10, and further beneficial to the improvement of the energy density of the battery device 100.

[0155] According to some embodiments of this application, see Figure 5 and Figure 7 Along the first direction z, the first wall 21 has a second through hole 210, and at least a portion of the first conductive member 41 is disposed in the second through hole 210. The battery cell 10 further includes a second insulating member 70, and at least a portion of the second insulating member 70 is disposed between the hole wall of the second through hole 210 and the first conductive member 41.

[0156] The second through hole 210 is a through hole structure formed on the first wall 21 . The second through hole 210 penetrates the first wall 21 along the first direction z to accommodate the first conductive member 41 .

[0157] Optionally, in some embodiments, the entire first conductive member 41 can be disposed in the second through hole 210 and installed as a whole with the first wall 21 through other structural members, for example, a groove is formed in the hole wall of the second through hole 210 to accommodate an insulating structure, and the first wall 21 and the first conductive member 41 are connected through the insulating structure.

[0158] Optionally, a part of the first conductive member 41 is located outside the first wall 21 to form a connection with the outside of the first wall 21, and an insulating structure may be provided between the two to isolate them from each other. Another part of the first conductive member 41 is disposed in the second through hole 210.

[0159] The second insulating member 70 can be made of a material with a relatively high resistance value, such as an organic insulating material, an inorganic insulating material, or a hybrid insulating material. Optionally, in some embodiments of the present application, the material of the second insulating member 70 may include an insulating PPS (polyphenylene sulfide) material. In some other embodiments, the second insulating member 70 can also be made of other materials with insulating properties, such as polypropylene, polyethylene, etc.

[0160] At least a part of the second insulating member 70 is disposed between the inner wall of the second through hole 210 and the first conductive member 41. Optionally, the second insulating portion 72 may include multiple parts, one of which is located between the inner wall of the second through hole 210 and the outer peripheral surface of the first conductive member 41, and the remaining parts can be disposed at other positions. For example, one of the remaining parts can be disposed between the first insulating member 60 and the inner side of the first wall 21, or the remaining parts can be disposed between the inner side of the first conductive member 41 and the first insulating member 60.

[0161] In the above solution, by providing the second insulating member 70, the first conductive member 41 and the inner wall of the second through hole 210 can be effectively insulated and isolated, reducing the risk of short circuit between the first wall 21 and the first conductive member 41, which may cause an internal short circuit of the battery cell 10, making the battery cell 10 highly reliable, and thus making the battery device 100 highly reliable.

[0162] According to some embodiments of the present application, please refer to Figure 10 , Figure 10 is Figure 7 an enlarged view of the C position in. A second groove 211 is formed on the outside of the first wall 21, the second through hole 210 is formed on the bottom surface of the second groove 211, and at least a part of the first conductive member 41 is disposed in the second groove 211.

[0163] In some embodiments, the outside of the first wall 21 may be recessed inwardly into the housing 20 to form a second groove 211, and the second through hole 210 is formed on the bottom surface of the second groove 211. The second groove 211 can accommodate at least a part of the first conductive member 41, and the bottom surface of the second groove 211 can form an abutting relationship with the first conductive member 41 to limit the movement of the first conductive member 41 in the first direction z.

[0164] Optionally, the side of the first conductive member 41 facing away from the inside of the housing 20 may not extend beyond the outside of the first wall 21; optionally, the side of the first conductive member 41 facing away from the inside of the housing 20 may extend beyond the outside of the first wall 21.

[0165] In the above solution, by providing a second groove 211 on the outer side of the first wall 21 to accommodate at least a part of the first conductive member 41, the first conductive member 41 can make reasonable use of the space where the first wall 21 is located, so as to streamline the overall size of the battery cell 10, which is beneficial to improving the volumetric energy density of the battery cell 10, and further beneficial to improving the energy density of the battery device 100.

[0166] According to some embodiments of the present application, please refer to Figure 7 and Figure 11 , Figure 11 which is a schematic diagram of the first conductive member 41 in some embodiments of the present application. The first conductive member 41 includes a first conductive portion 412 and a second conductive portion 413 arranged along the first direction z. At least a part of the first conductive portion 412 is located in the second groove 211, and at least a part of the second conductive portion 413 is located in the second through hole 210. The second insulating member 70 includes a first insulating portion 71, a second insulating portion 72, and a third insulating portion 73. The second insulating portion 72 connects the first insulating portion 71 and the third insulating portion 73. The first insulating portion 71 is located between the side wall of the second groove 211 and the first conductive portion 412. The second insulating portion 72 is located between the bottom surface of the second groove 211 and the first conductive portion 412. The third insulating portion 73 is located between the hole wall of the second through hole 210 and the second conductive portion 413.

[0167] In some embodiments, the first conductive member 41 includes a first conductive portion 412 and a second conductive portion 413. The first conductive portion 412 can be arranged in the second groove 211, and the second conductive portion 413 can be arranged in the second through hole 210.

[0168] In some embodiments, the projected area of the first conductive portion 412 along the first direction z is larger than the projected area of the second conductive portion 413 along the first direction z, and the first conductive portion 412 can abut against the bottom surface of the second groove 211.

[0169] The connection relationship between the first conductive portion 412 and the second conductive portion 413 includes but is not limited to welding, clamping, riveting, or connection with a threaded member. Or the first conductive portion 412 and the second conductive portion 413 are an integrally formed structure, and are formed by processes such as die casting and casting.

[0170] In some embodiments, the manufacturing materials of the first conductive portion 412 and the second conductive portion 413 can be the same or different. Exemplarily, the materials of the first conductive portion 412 and the second conductive portion 413 are the same, and the manufacturing materials of the two can include but are not limited to aluminum, aluminum alloy, copper, copper alloy, or stainless steel, etc. Exemplarily, the materials of the first conductive portion 412 and the second conductive portion 413 are different. For example, the material of the first conductive portion 412 includes aluminum, and the material of the second conductive portion 413 includes copper.

[0171] The second insulating member 70 includes a plurality of structural members, and the second insulating member 70 includes a first insulating portion 71, a second insulating portion 72, and a third insulating portion 73. The first insulating portion 71, the second insulating portion 72, and the third insulating portion 73 are connected to each other so as to cover at least a portion of the outer contour of the first conductive portion 412 and the second conductive portion 413. Exemplarily, at least a portion of the first insulating portion 71 is located between the groove side surface of the second groove 211 and the outer peripheral surface of the first conductive portion 412 (for example, the first insulating portion 71 has a portion located outside the first wall 21); the second insulating portion 72 is located between the groove bottom surface of the second groove 211 and the surface of the first conductive portion 412 facing the inside of the housing 20; and the third insulating portion 73 is located between the hole wall of the second through hole 210 and the outer peripheral surface of the second conductive portion 413.

[0172] In the above scheme, the second insulating member 70 includes a first insulating portion 71, a second insulating portion 72 and a third insulating portion 73. The first insulating portion 71, the second insulating portion 72 and the third insulating portion 73 are arranged along the outer contour of the first conductive member 41, which can effectively insulate and isolate the first conductive member 41 and the first wall 21, and can improve the sealing performance between the first conductive member 41 and the first wall 21, and can effectively reduce the risk of electrolyte leakage from the connection interface between the first wall 21 and the first conductive member 41, so that the reliability of the battery cell 10 is high, and then the reliability of the battery device 100 is high.

[0173] According to some embodiments of this application, see Figure 10 The second insulating member 70 further includes a fourth insulating portion 74 , which is connected to an end of the third insulating portion 73 away from the second insulating portion 72 , and is located between the first insulating member 60 and the second conductive portion 413 .

[0174] In some embodiments, the second insulating member 70 further includes a fourth insulating portion 74 located between the first insulating member 60 and the second conductive portion 413. For example, the fourth insulating portion 74 may be located between the first insulating member 60 and a side of the second conductive portion 413 facing the interior of the housing 20.

[0175] Optionally, along the circumference of the first conductive part 41, the second insulating part 70 is an annular structure, and a stepped hole structure is formed inside the second insulating part. Along the direction from the outer side of the first wall 21 to the inner side, the inner diameter of the stepped hole inside the second insulating part 70 decreases gradually, and the hole wall of the stepped hole includes a first insulating part 71, a second insulating part 72, a third insulating part 73 and a fourth insulating part 74 in sequence.

[0176] In the above solution, by providing the fourth insulating portion 74 and positioning the fourth insulating portion 74 between the first insulating portion 71 and the second conductive portion 413, on the one hand, it can achieve the effect of positioning and assembling the first conductive member 41, and on the other hand, it can form a seal at the contact portion between the first insulating member 60 and the fourth insulating portion 74, effectively reducing the risk of electrolyte leakage from the connection interface between the first wall 21 and the first conductive member 41, resulting in high reliability of the battery cell 10 and thus high reliability of the battery device 100.

[0177] According to some embodiments of the present application, the battery cell 10 further includes an electrode assembly 30 and a first current collector member 90. The electrode assembly 30 has a first tab. At least a part of the first current collector member 90 is disposed on a side of the first insulating member 60 facing away from the first wall 21, and the first tab and the first pole 42 are electrically connected through the first current collector member 90. The first current collector member 90 includes a first connection section 91, a second connection section 92, and a third connection section 93. The first tab is connected to the first connection section 91, the first pole 42 is connected to the third connection section 93, a first fold 94 is formed between the first connection section 91 and the second connection section 92, and a second fold 95 is formed between the second connection section 92 and the third connection section 93.

[0178] In some implementations, through holes are respectively provided in the first connection section 91, the second connection section 92, and the third connection section 93, and the first pole 42 passes through the through holes of the first connection section 91, the second connection section 92, and the third connection section 93.

[0179] The first current collector member 90 is a component for connecting the first tab and the first electrode terminal 40 for electrical connection. In some embodiments, one end of the first current collector member 90 is connected to the first pole 42, and the other end is connected to the first tab. The connection relationship between the first current collector member 90 and the first pole 42 includes, but is not limited to, bonding, welding, riveting, threaded member connection, or other connection relationships.

[0180] The first current collector member 90 can be a multi-segment structure, including the first connection section 91, the second connection section 92, and the third connection section 93 that are connected to each other, and each segment structure can be folded with respect to each other. Optionally, a first fold 94 is formed between the first connection section 91 and the second connection section 92, so that the first connection section 91 and the second connection section 92 can be folded or unfolded along the first fold 94. A second fold 95 is formed between the second connection section 92 and the third connection section 93, so that the second connection section 92 and the third connection section 93 can be folded or unfolded along the second fold 95. As Figure 7 shown, the first current collector member 90 is a three-segment folded structure, and the first connection section 91, the second connection section 92, and the third connection section 93 are folded into three layers.

[0181] Optionally, the first current collector member 90 is a current collecting plate, as Figure 5As shown, the first connecting section 91 is provided with two welding areas for welding with the first tab. The third connecting section 93 is connected to the first pole 42.

[0182] In the above technical solution, the first current collector member 90 includes a first connecting section 91, a second connecting section 92, and a third connecting section 93 that are sequentially connected, and the three-section structure can be folded with each other. On the one hand, it can reduce the assembly difficulty of the first current collector member 90, the first pole 42, and the electrode assembly 30, and improve the manufacturing efficiency of the battery cell 10; on the other hand, since the first current collector member 90 can be folded, the space utilization of the first current collector member 90 is high, which is conducive to the improvement of the volumetric energy density of the battery cell 10, and further conducive to the improvement of the volumetric energy density of the battery device 100.

[0183] Some embodiments of the present application also provide a battery device 100, which includes the battery cell 10 described above.

[0184] In some embodiments, please refer to Figure 2 , the battery device 100 includes a battery cell 10 and a box body 200, and the battery cell 10 is accommodated in the box body 200. Among them, the box body 200 is used to provide an accommodation space for the battery cell 10, and the box body 200 can adopt various structures. In some embodiments, the box body 200 may include a first box body part 200a and a second box body part 200b, the first box body part 200a and the second box body part 200b are covered with each other, and the first box body part 200a and the second box body part 200b jointly define an accommodation space for accommodating the battery cell 10. The second box body part 200b may be a hollow structure with one end open, and the first box body part 200a may be a plate-like structure. The first box body part 200a is covered on the opening side of the second box body part 200b so that the first box body part 200a and the second box body part 200b jointly define an accommodation space; the first box body part 200a and the second box body part 200b may also both be hollow structures with one side open, and the opening side of the first box body part 200a is covered on the opening side of the second box body part 200b. Of course, the box body 200 formed by the first box body part 200a and the second box body part 200b can be various shapes, such as a cylinder, a cuboid, etc.

[0185] In the battery device 100, the battery cells 10 may be one or more, and each battery cell 10 may be fixed to the box body 200 by a connecting member (such as a bolt), or each battery cell 10 may be fixed to the box body 200 by an adhesive method. In some embodiments, multiple battery cells 10 may first form a battery cell assembly and then be arranged in the box body 200 in the form of the battery cell assembly.

[0186] Some embodiments of the present application further provide an electrical device 1000, the battery cell 10 provided above, or the battery device 100 provided above. The battery cell 10 is used to provide electrical energy.

[0187] The electrical device 1000 may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like.

[0188] Exemplarily, the electrical device 1000 may be a vehicle. The battery cell 10 can not only serve as the operating power source or the power source for use of the vehicle, but also serve as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0189] According to some embodiments of the present application, a battery cell 10 is provided. Please refer to Figures 3 - 11 The battery cell 10 includes a housing 20, a first electrode terminal 40, a second electrode terminal 50, and an electrode assembly 30.

[0190] The housing 20 may include a housing body 22, a first end cap, and a second end cap 23. Along the first direction z, both ends of the housing body 22 form openings, and the first end cap and the second end cap 23 respectively close the two openings to jointly form a sealed space. In some embodiments, the first end cap is the first wall 21 of the housing 20, and the first direction z is the thickness direction of the first end cap.

[0191] The first end cap is provided with the first electrode terminal 40, the second end cap 23 is provided with the second electrode terminal 50, and the electrode assembly 30 is disposed inside the housing 20. In some embodiments of the present application, the first electrode is taken as the positive electrode and the second electrode is taken as the negative electrode as an example for illustration. In some embodiments of the present application, the structural relationship between the first electrode terminal 40 and the first end cap is described, and the structural relationship between the second electrode terminal 50 and the second end cap 23 can be understood by corresponding reference.

[0192] In some embodiments, the first end cap is provided with a liquid injection hole and a pressure relief mechanism, and the electrolyte can be injected into the housing 20 through the liquid injection hole. The second end cap 23 is provided with a pressure relief mechanism.

[0193] Please refer to Figures 3 - 11 The first electrode terminal 40 includes a first conductive member 41 and a first pole column 42. A first groove 411 is formed on the outer side of the first conductive member 41, and a first through hole 410 is formed on the groove bottom surface of the first groove 411. The first pole column 42 is installed in the first through hole 410. The first through hole 410 is a stepped hole, including a first hole section 4100 and a second hole section 4101, and the first hole section 4100 and the second hole section 4101 are connected by a first step surface 4102.

[0194] The first terminal post 42 includes a first main body 420, a first flange 421 and a second flange 422. The first flange 421 is disposed in the first groove 411, and the bottom surface of the first flange 421 abuts against the bottom surface of the first groove 411. The first main body 420 passes through the first through hole 410, and the second flange 422 is located inside the first conductive member 41 for connecting the first tab of the electrode assembly 30.

[0195] In some embodiments, a first seal 80 is disposed in the first through hole 410. The first seal 80 is located in the first hole section 4100. The first seal 80 is an O-ring, and the O-ring is sleeved on the first main body 420.

[0196] The first end cap is formed with a second groove 211, and a second through hole 210 is formed in the bottom surface of the second groove 211. The first conductive member 41 includes a first conductive portion 412 and a second conductive portion 413. The first conductive portion 412 is disposed in the second groove 211, and the second conductive portion 413 is disposed in the second through hole 210.

[0197] A second insulating member 70 is disposed between the first end cap and the first conductive member 41. The second insulating member 70 covers at least a part of the outer contours of the first conductive portion 412 and the second conductive portion 413. For example, the second insulating member 70 covers the outer peripheral surface of the first conductive portion 412 and the surface of the first conductive portion 412 facing the inside of the housing 20. The second insulating member 70 further includes the outer peripheral surface of the second conductive portion 413 and a part of the surface of the second conductive portion 413 facing the inside of the housing 20.

[0198] The battery cell 10 further includes a first insulating member 60. The first insulating member 60 includes a first part 61 and a second part 62. A first through hole 63 is formed in the middle of the first part 61, and the first main body 420 passes through the first through hole 63. In some embodiments, the first flange 421 can pass through the first through hole 63 by pressing the first part 61. In some embodiments, the first insulating member 60 and the first terminal post 42 can be integrally formed by injection molding. The second part 62 is disposed around the edge of the first through hole 63 and protrudes from the first part 61.

[0199] A part of the first part 61 can be connected to the inner side of the first wall 21, and a part of the first part 61 can be located between the upper surfaces of the first conductive member 41 and the second flange 422. The second part 62 can be located between the first main body 420 and the hole wall of the first through hole 410. A convex portion 621 is provided on the surface of the second part 62 facing the first hole section 4100. The convex portion 621 is frustum-shaped, and the convex portion 621 has a first connection surface 622 facing the first step surface 4102. The first connection surface 622 abuts against the first step surface 4102 to limit the movement of the first conductive member 41 in the first direction z.

[0200] In the above solution, by disposing the second part 62 of the first insulating member 60 between the first through hole 410 and the first pole 42, and providing a convex portion 621 on the second part 62 that abuts against the first step surface 4102 of the first through hole 410, the positional relationship of the first conductive part 412 relative to the first wall 21 can be effectively restricted, and the structural stability among the first insulating member 60, the first wall 21, and the first conductive member 41 can be made high, reducing the risk that the first conductive member 41 displaces outward from the first wall 21 due to the internal pressure of the battery cell 10, resulting in loosening of the connection interface between the first conductive member 41 and the first pole 42 to generate a gap and thus causing electrolyte leakage. Therefore, the reliability of the battery cell 10 can be effectively improved, and further the reliability of the battery device 100 can be improved.

[0201] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that, include: a housing having a first wall; A first conductive member is disposed on the first wall and insulated from the first wall, and the first conductive member has a first through hole along a first direction, and the first direction is a thickness direction of the first wall; A first pole, mounted in the first through hole; a first insulating member, at least partially disposed on an inner side of the first wall; Wherein, the first insulating member and the first conductive member are connected to each other.

2. The battery cell according to claim 1, characterized in that: The first insulating member includes a first part and a second part, the first part is arranged on the inner side of the first wall, the second part is arranged on the side of the first part facing the first conductive member, and the second part is at least partially located between the hole wall of the first through hole and the outer peripheral surface of the first pole, and the second part is connected to the hole wall of the first through hole.

3. The battery cell according to claim 2, characterized in that: Along the circumference of the first pole, the second portion is an annular structure.

4. The battery cell according to claim 2, characterized in that, Also includes: A first sealing member is disposed in the first through hole and is located between a hole wall of the first through hole and an outer peripheral surface of the first pole.

5. The battery cell according to claim 4, characterized in that: A limiting portion is provided between the second portion and the hole wall of the first through hole, for limiting the relative displacement of the first insulating member and the first conductive member along the first direction; Along the first direction, the first sealing member is located on a side of the limiting portion away from the first portion.

6. The battery cell according to claim 5, characterized in that: The limiting portion includes a convex portion provided on a side of the second portion facing the hole wall of the first through hole, and along the first direction, the convex portion has a first connecting surface facing the first portion; Along the first direction, the first through hole includes a first hole segment and a second hole segment arranged with each other, the first hole segment and the second hole segment are connected by a first step surface, and the first connecting surface is connected with the first step surface with each other.

7. The battery cell according to claim 6, characterized in that: The second part also includes a second connecting surface and a third connecting surface. Along the first direction, the second connecting surface is arranged opposite to the first connecting surface, the third connecting surface connects the first connecting surface and the second connecting surface, and the third connecting surface is arranged obliquely to the first connecting surface.

8. The battery cell according to claim 2, characterized in that: The first pole includes a first body, a first flange and a second flange. Along the first direction, the first flange and the second flange are respectively arranged at opposite ends of the first body, the first body is penetrated by the first through hole, the first flange is connected to the outer side of the first wall, and the second flange is located on the side of the first part away from the first wall.

9. The battery cell according to claim 8, characterized in that: A first groove is formed on the outer side of the first conductive member, the first through hole is formed on the bottom surface of the first groove, and at least a portion of the first flange is disposed in the first groove.

10. The battery cell according to claim 1, characterized in that: Along the first direction, the first wall has a second through hole, and at least part of the first conductive member is disposed in the second through hole; the battery cell further includes a second insulating member, and at least part of the second insulating member is disposed between the hole wall of the second through hole and the first conductive member.

11. The battery cell according to claim 10, characterized in that: A second groove is formed on the outer side of the first wall, the second through hole is formed on the bottom surface of the second groove, and at least a portion of the first conductive member is disposed in the second groove.

12. The battery cell according to claim 11, characterized in that: The first conductive member includes a first conductive portion and a second conductive portion arranged along a first direction, at least a portion of the first conductive portion is located in the second groove, and at least a portion of the second conductive portion is located in the second through hole; The second insulating part includes a first insulating portion, a second insulating portion and a third insulating portion, the second insulating portion connects the first insulating portion and the third insulating portion, the first insulating portion is located between the groove side surface of the second groove and the first conductive portion, the second insulating portion is located between the groove bottom surface of the second groove and the first conductive portion, and the third insulating portion is located between the hole wall of the second through hole and the second conductive portion.

13. The battery cell according to claim 12, characterized in that: The second insulating member further includes a fourth insulating portion, the fourth insulating portion is connected to an end of the third insulating portion that is away from the second insulating portion, and the fourth insulating portion is located between the first insulating member and the second conductive portion.

14. The battery cell according to any one of claims 1-13, characterized in that, Also includes: An electrode assembly having a first electrode tab; a first current collecting member, at least partially disposed on a side of the first insulating member away from the first wall, the first electrode tab and the first electrode post being electrically connected via the first current collecting member; The first current collecting member includes a first connecting segment, a second connecting segment and a third connecting segment, the first electrode tab is connected to the first connecting segment, the first electrode column is connected to the third connecting segment, a first fold is formed between the first connecting segment and the second connecting segment, and a second fold is formed between the second connecting segment and the third connecting segment.

15. A battery device, characterized in that, A battery cell comprising the battery cell according to any one of claims 1 to 14.

16. An electrical device, characterized in that, The invention comprises the battery cell according to any one of claims 1 to 14, or the battery device according to claim 15, wherein the battery cell is used to provide electrical energy.

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