Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment, the battery monomer provided by the utility model comprises a shell assembly, a pole assembly and a sealing ring, the shell assembly comprises a wall part, and the wall part is provided with a through hole; the pole assembly is fixed on the wall part and covers the through hole, the pole assembly comprises a bearing seat and a pole, the bearing seat comprises an annular flange, the annular flange is provided with an inner end face and an outer end face which are arranged oppositely in the axial direction of the pole assembly and an inner ring face connected with the inner end face and the outer end face, the pole is arranged on the outer end face, and the inner end face and the wall part are arranged at an interval to form a spacer region; the pole is exposed from a hollow area formed by surrounding of the inner ring surface; the sealing ring is arranged in the annular flange and surrounds the through hole, the exposed part of the pole axially presses the sealing ring on the wall part, and the sealing ring is further arranged in the interval area in the pressing state. The sealing ring is arranged in the spacer region in the pressing state, so that the climbing path of the metal dendritic crystal is prolonged, and the risk of short circuit of the wall part and the pole is relieved.

Description

TECHNICAL FIELD

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

[0002] Energy saving and emission reduction is the key to sustainable development, which promotes the adjustment of energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle ability, high working voltage, environmental protection and low self-discharge.

[0003] The battery includes one or more battery monomers, the wall part of the battery monomer is provided with a pole, and the pole and the wall part are tightly pressed with a sealing ring. The pole and the wall part can be insulated by the sealing ring. However, during the long-term use of the battery monomer, metal dendrites may be generated on the outer wall surface of the sealing ring. For example, copper residues left by welding process or copper in the copper material of the pole may be precipitated in the form of ions and reduced to copper atoms on the outer wall surface of the sealing ring, thereby forming dendrites. The metal dendrites climb along the outer wall surface of the sealing ring, which may easily cause short circuit between the pole and the wall part. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the present application is to provide a battery monomer, a battery device and an electric equipment, which aims to solve the above technical problems existing in the prior art.

[0005] To solve the above problems, the present application provides a battery monomer, which includes a shell assembly, a pole assembly and a sealing ring. The shell assembly includes a wall part, and the wall part is provided with a through hole. The pole assembly is fixed to the wall part and covers the through hole. The pole assembly includes a seat and a pole arranged on the seat. The seat includes an annular flange having an inner end face and an outer end face arranged opposite to each other along the axial direction of the pole assembly, and an inner annular surface connecting the inner end face and the outer end face. The pole is arranged on the side of the outer end face away from the inner end face. The inner end face is arranged spaced apart from the wall part to form a spacing area. The pole is exposed from the hollow area surrounded by the inner annular surface. The sealing ring is arranged inside the annular flange and surrounds the through hole. The exposed part of the pole along the axial direction presses the sealing ring on the wall part in the pressing state. In the pressing state, the sealing ring is further arranged in the spacing area. Therefore, the inner end face of the annular flange is arranged spaced apart from the wall part to form a spacing area. By arranging the spacing area and arranging the sealing ring in the spacing area in the pressing state, the climbing path of the metal dendrites can be effectively prolonged, thereby relieving the risk of short circuit between the wall part and the pole caused by the metal dendrites, and improving the reliability of the battery monomer.

[0006] In some embodiments, in the compressed state, the sealing ring is in contact with the inner end face and / or the inner annular face. Thus, in the compressed state, the sealing ring is in contact with the inner end face and / or the inner annular face, reducing the climbable space of the metal dendrites on the outer wall surface of the sealing ring, further blocking the climbing path of the metal dendrites, thereby mitigating the risk of short circuit of the wall portion and the pole caused by the metal dendrites.

[0007] In some embodiments, in the compressed state, the volume of the portion of the sealing ring located in the spacing region is less than the volume of the spacing region. Thus, the sealing ring is provided with sufficient space redundancy by the spacing region, so that the sealing ring can be fully compressed by the pole, mitigating the risk of insufficient compression of the sealing ring due to insufficient space, and reducing the sealing performance.

[0008] In some embodiments, the seat further comprises a support portion surrounding the outer periphery of the annular flange, and having a support surface supported on the wall portion and a connecting surface connecting the support surface and the inner end face, the connecting surface being used to define the boundary of the spacing region along the radial direction of the pole assembly, and the portion of the sealing ring located in the spacing region is arranged in contact with the inner end face and spaced apart from the connecting surface. Thus, the sealing ring is in contact with the inner end face, reducing the climbable space of the metal dendrites on the outer wall surface of the sealing ring, blocking the climbing path of the metal dendrites, while the sealing ring is spaced apart from the connecting surface, improving the space redundancy, mitigating the risk of limited compression of the sealing ring due to insufficient space, and reducing the sealing performance.

[0009] In some embodiments, the sealing ring is arranged to be deformed to extend into the spacing region under the compression of the pole assembly. Thus, the portion of the sealing ring located in the spacing region can be formed by the deformation of the sealing ring itself, which is simple in structure and reduces production costs.

[0010] In some embodiments, in the natural state, the sealing ring comprises a main body portion located inside the annular flange and an extension portion located in the spacing region, and the exposed portion of the pole compresses the main body portion on the wall portion. Thus, by pre-arranging the extension portion located in the spacing region, it is easier to control the increase in the climbing path, while mitigating the risk of reduced sealing performance of the sealing ring due to excessive compression.

[0011] In some embodiments, the inner end face is arranged to compress the extension portion on the wall portion, and the compression distance of the main body portion along the axial direction is greater than the compression distance of the extension portion along the axial direction. Thus, the inner end face compresses the extension portion, which can improve the blocking effect of the climbing path of the metal dendrites, further mitigating the risk of short circuit of the wall portion and the pole caused by the metal dendrites, and the compression distance of the main body portion is greater than that of the extension portion, so that the main body portion is fully compressed, improving the sealing effect.

[0012] In some embodiments, the wall portion is provided with a groove, which is arranged at the periphery of the through hole and is used to accommodate the sealing ring in the compressed state. In this way, the groove can provide more compression space for the sealing ring, thereby alleviating the risk of insufficient compression of the sealing ring due to insufficient space, resulting in a decrease in sealing performance.

[0013] In some embodiments, the projection of the groove in the axial direction at least partially overlaps with the spacing area. In this way, the groove can accommodate the portion of the sealing ring in the spacing area, thereby improving the sealing effect of the portion of the sealing ring compressed by the exposed portion of the pole post.

[0014] In some embodiments, the depth of the groove increases in the radial direction of the pole post assembly and away from the through hole. In this way, the groove gradually increases the accommodation amount of the sealing ring in the radial direction of the pole post assembly and away from the through hole, so that the sealing ring sufficiently extends into the spacing area in the compressed state.

[0015] To solve the above problems, the application further provides a battery device, which comprises the above battery monomer.

[0016] To solve the above problems, the application further provides a power consumption device, which comprises the above battery device. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a structural schematic diagram of a vehicle according to one or more embodiments of the present application;

[0019] Figure 2 is an exploded structural schematic diagram of a battery device according to one or more embodiments of the present application;

[0020] Figure 3 is a structural schematic diagram of a battery monomer according to one or more embodiments of the present application;

[0021] Figure 4 is an exploded schematic diagram of a battery monomer according to Figure 3

[0022] Figure 5 is a partial exploded schematic diagram of a battery monomer according to Figure 3

[0023] Figure 6 is a partial exploded schematic diagram of a battery monomer according to Figure 3 ​​A cross-sectional view of the battery cell shown along the A-A direction;

[0024] Figure 7 is according to Figure 6 A partial enlarged view of the B area of the battery cell shown;

[0025] Figure 8 is according to Figure 7 A partial enlarged view of the C area of the battery cell shown.

[0026] Reference signs: vehicle 1; battery device 2; controller 3; motor 4; box 20; first part 21; second part 22; battery cell 10; shell assembly 100; wall part 110; through hole 111; groove 112; shell 120; end cover 130; pole post assembly 200; seat 210; annular flange 211; inner end face 2111; outer end face 2112; inner annular face 2113; support part 212; support face 2121; connecting face 2122; pole post 220; sealing ring 300; main body part 310; extension part 320; interval region P1; hollow region P2; axial direction x1; radial direction x2. DETAILED DESCRIPTION

[0027] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and the claims and the above description of drawings are intended to cover the inclusion not the exclusion of one or more elements.

[0029] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0030] In this document, the term "embodiment" means that the specific features, structures or properties described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0032] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0033] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of the battery, the demand of its market is also increasing.

[0036] Batteries referred to in the art can be classified as primary batteries and secondary batteries depending on whether they can be recharged. Primary batteries, also known as "disposable" batteries and primary cells, cannot be recharged and must be disposed of after their charge is depleted. Secondary batteries, also known as rechargeable batteries or secondary cells, are manufactured and processed differently from primary batteries and have the advantage of being able to be used multiple times after being recharged. Secondary batteries have a higher load current capacity than most primary batteries. Common types of secondary batteries include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. Lithium-ion batteries have the advantages of being lightweight, having a large capacity (1.5 to 2 times the capacity of a nickel-metal hydride battery of the same weight), having no memory effect, and having a very low self-discharge rate. As a result, even though they are relatively expensive, they are widely used. Lithium-ion batteries are also widely used in electric vehicles and hybrid vehicles. Lithium-ion batteries used for such purposes have a relatively low capacity, but have a high output, a high charging current, and a long service life, although they are more expensive.

[0037] The batteries described in the embodiments of the present application refer to secondary batteries or primary batteries. In the following, the embodiments of the present application will be described mainly with reference to lithium-ion batteries. It should be understood that the embodiments of the present application are applicable to any other suitable type of secondary battery. The batteries referred to in the embodiments disclosed in the present application can be directly or indirectly applied to suitable devices to power the devices.

[0038] The present application provides a power consuming device, which can include but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a stationary or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc. The power consuming device can include a battery device, and the power consuming device can provide power through the battery device to realize corresponding functions.

[0039] Taking an electric vehicle as an example, the electric vehicle can include a battery device.

[0040] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of a vehicle according to one or more embodiments of the present application.

[0041] The vehicle 1 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1 is internally provided with a battery device 2, which can be arranged at the bottom, the head, or the tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as an operating power source of the vehicle 1. The vehicle 1 can further include a controller 3 and a motor 4, and the controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the power demand of the vehicle 1 during starting, navigation, and driving.

[0042] In some embodiments of the present application, the battery device 2 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0043] In order to improve the performance of the electric equipment, the present application further provides a battery device, which is described below with reference to Figure 2 , Figure 2 is a schematic diagram of the exploded structure of the battery device according to one or more embodiments of the present application.

[0044] The shape of the battery device 2 can include but is not limited to a square cylinder or any other shape.

[0045] In some embodiments, the battery device 2 can include a box body 20 and a battery cell 10, and the battery cell 10 is accommodated in the box body 20. The box body 20 is used to provide an accommodation space 130 for the battery cell 10, and the box body 20 can adopt various structures. In some embodiments, the box body 20 can include a first part 21 and a second part 22, and the first part 21 and the second part 22 are mutually covered to jointly define the accommodation space 130 for accommodating the battery cell. The second part 22 can be a hollow structure with one end open, and the first part 21 can be a plate structure, which is covered on the open side of the second part 22 to jointly define the accommodation space 130 with the second part 22; or the first part 21 and the second part 22 can both be hollow structures with one side open, and the open side of the first part 21 is covered on the open side of the second part 22.

[0046] In the battery device 2, the battery cells 10 can be multiple, and the multiple battery cells 10 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 10 are connected in series and in parallel. The multiple battery cells 10 can be directly connected in series or in parallel or in a mixed manner, and then the multiple battery cells 10 are accommodated in the box 20. Of course, the battery device 2 can also be that the multiple battery cells 10 are connected in series or in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole and are accommodated in the box 20. The battery device 2 can also include other structures. For example, the battery device 2 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 10.

[0047] The manufacturing methods of the battery cells 10 include the laminated type and the winding type, that is, the battery cells 10 are divided into the laminated battery and the winding battery. The laminated battery has uniform current collection effect, small internal resistance, and large specific power. However, in order to improve the precision, the mold precision is required to be extremely high, the equipment investment is high, and the process is relatively complex, and the production efficiency is low. The winding battery is simple to manufacture, the equipment precision is generally required in the manufacturing and assembling process, the production efficiency is high, and the cost is relatively low. In terms of performance, the winding battery has excellent high and low temperature performance, very fast charging, super long life, stable high output voltage, and strong structure and shock resistance.

[0048] The battery cell 10 refers to the smallest unit of the battery device 2. The battery cell 10 can include a housing assembly 100, an electrode assembly, and other functional components. The housing assembly 100 can form an internal environment of the battery cell 10 and isolate the internal environment of the battery cell 10 from the external environment. It can be understood that the housing assembly 100 can provide support and protection for the components in the internal environment of the battery cell 10.

[0049] The outer wall surface of the sealing ring 300 near the pole post 220 of the battery cell 10 can generate metal dendrites. For example, copper residues left over from welding or copper in the copper material of the pole post 220 can be precipitated in the form of ions and reduced to copper atoms on the outer wall surface of the sealing ring 300, and then form dendrites. The wall portion 110 of the battery cell 10 is usually made of conductive material. The metal dendrites climb along the outer wall surface of the sealing ring 300, which can easily cause short circuit between the pole post 220 and the wall portion 110.

[0050] To solve the technical problems in the related art, a battery cell, a battery device, and an electric equipment are provided. The seat of the battery cell pole post assembly for supporting the pole post has an annular flange. The sealing ring is arranged inside the annular flange, and in the pressing state, the sealing ring is also arranged in the interval between the inner end surface of the annular flange and the wall portion, thereby effectively prolonging the climbing path of the metal dendrites, and thereby relieving the risk of short circuit between the wall portion and the pole post caused by the metal dendrites.

[0051] Referring to Figures 3-8 , Figure 3 is a structural schematic diagram of a battery cell according to one or more embodiments of the present application; Figure 4 is an exploded schematic diagram of a battery cell according to Figure 3 ; Figure 5 is a partial exploded schematic diagram of a battery cell according to Figure 3 ; Figure 6 is a sectional schematic diagram of a battery cell along the A-A direction according to Figure 3 ; Figure 7 is a partial enlarged schematic diagram of a B region of a battery cell according to Figure 6 ; Figure 8 is a partial enlarged schematic diagram of a C region of a battery cell according to Figure 7 .

[0052] The battery cell 10 comprises a housing assembly 100, a pole assembly 200 and a sealing ring 300, the housing assembly 100 comprises a wall portion 110, and the wall portion 110 is provided with a through hole 111; the pole assembly 200 is fixed to the wall portion 110 and covers the through hole 111, and the pole assembly 200 comprises a seat 210 and a pole 220 provided on the seat 210, the seat 210 comprises an annular flange 211, the annular flange 211 has an inner end face 2111 and an outer end face 2112 which are arranged opposite to each other along an axial direction x1 of the pole assembly 200, and an inner annular face 2113 connecting the inner end face 2111 and the outer end face 2112, the pole 220 is arranged on a side of the outer end face 2112 away from the inner end face 2111, the inner end face 2111 is arranged spaced apart from the wall portion 110 to form a spacing region P1, and the pole 220 is exposed from a hollow region P2 formed by the inner annular face 2113; the sealing ring 300 is arranged inside the annular flange 211 and surrounds the through hole 111, the exposed part of the pole 220 along the axial direction x1 holds the sealing ring 300 on the wall portion 110, and in the holding state, the sealing ring 300 is further arranged in the spacing region P1.

[0053] The shell assembly 100 can serve as a carrier of the pole assembly 200 and the sealing ring 300, so that the pole assembly 200 and the sealing assembly are directly or indirectly fixed relative to the shell assembly 100. The shell assembly 100 can isolate the internal environment of the battery monomer 10 from the external environment. The shell assembly 100 can have a certain hardness and strength, so that the shell assembly 100 is not easy to deform when being squeezed and collided, thereby improving the safety performance of the battery monomer 10. The shell assembly 100 can have any shape, for example, the shape of the shell assembly 100 includes but is not limited to a square, a cylinder, a prism, etc. The shell assembly 100 can be an internal hollow structure, and the inside of the shell assembly 100 can be used to accommodate electrode assemblies, electrolyte, etc. The electrode assembly is a component in which electrochemical reactions occur in the battery monomer 10. The shell assembly 100 can contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually arranged between the positive and negative electrode sheets. The positive and negative electrode sheets have a portion of active material constituting a main body 310 of the electrode assembly, and a portion of the positive and negative electrode sheets without active material each constitutes a tab. The positive and negative tabs can be located at one end of the main body 310 or at two ends of the main body 310, respectively. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.

[0054] The shell assembly 100 can include a shell 120 and an end cover 130. The end cover 130 refers to a component that covers the opening of the shell 120 to isolate the internal environment of the battery monomer 10 from the external environment. Without limitation, the shape of the end cover 130 can be adapted to the shape of the shell 120 to fit the shell 120. Optionally, the end cover 130 can be made of a material with a certain hardness and strength, such as an aluminum alloy, so that the end cover 130 is not easy to deform when being squeezed and collided, so that the battery monomer 10 can have higher structural strength, and the safety performance can also be improved. The end cover 130 can be provided with functional components such as electrode terminals. The electrode terminals can be used for electrical connection with the electrode assembly for output or input of the electrical energy of the battery monomer 10. In some embodiments, the electrode terminals can include the pole assembly 200. The pole assembly 200 can include positive and negative pole assemblies 220 for output of current and connection with external circuits. In some embodiments, the end cover 130 can also be provided with a pressure relief device for relieving internal pressure when the internal pressure or temperature of the battery monomer 10 reaches a threshold value. The material of the end cover 130 can include but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member can also be provided on the inner side of the end cover 130. The insulating member can be used to isolate the electrical connection components in the shell 120 from the end cover 130 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0055] The shell 120 is a component for fitting the end cover 130 to form an internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell 120 and the end cover 130 can be independent components, and an opening can be provided on the shell 120, and the end cover 130 is used to cover the opening to form the internal environment of the battery cell 10. Without limitation, the end cover 130 and the shell 120 can also be integrated, specifically, the end cover 130 and the shell 120 can form a common connecting surface 2122 before other components enter the shell, and when it is necessary to seal the internal environment of the shell assembly 100, the end cover 130 is used to cover the shell 120. The shell 120 can be of various shapes and sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 120 can be determined according to the specific shape and size of the electrode assembly. The material of the shell 120 can include but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0056] The shell assembly 100 includes a wall portion 110, which can be any side wall of the shell assembly 100. For example, when the shell assembly 100 is square, the six side surfaces of the square shell assembly 100 can be used as the wall portion 110 of the present embodiment. Alternatively, the wall portion 110 can be the side wall of the shell assembly 100 where the end cover 130 is located. It should be noted that the wall portion 110 is usually made of conductive material, so if the metal dendrites contact the wall portion 110 and the pole 220 at the same time, it is easy to cause short circuit between the wall portion 110 and the pole 220.

[0057] The wall portion 110 is provided with a through hole 111, which can communicate the inside and outside of the shell assembly 100, and the pole assembly 200 is fixed to the wall portion 110 and covers the through hole 111. The pole assembly 200 includes a seat 210 and a pole 220 arranged on the seat 210, and the seat 210 can be used to support the pole 220. The material of the seat 210 can be a material with good insulation, including but not limited to plastic and rubber. The pole 220 can be a negative pole 220. It can be understood that the risk of metal cations being reduced to metal atoms near the negative pole 220 to form metal dendrites is higher. The seat 210 includes an annular flange 211, which has an inner end face 2111 and an outer end face 2112 arranged opposite along the axial direction x1 of the pole assembly 200, and an inner annular face 2113 connecting the inner end face 2111 and the outer end face 2112. It should be noted that the axial direction x1 of the pole assembly 200 can be understood as the direction of the center of the pole 220 pointing to or away from the internal space of the shell assembly 100, for example, the direction of the interval between the inner and outer end faces 2112 of the pole 220. It can be understood that, as viewed along the axial direction x1 of the pole assembly 200, the annular flange 211 has a ring shape, and the outer end face 2112 is farther away from the internal space of the shell assembly 100 than the inner end face 2111. The pole 220 is arranged on the side of the outer end face 2112 of the annular flange 211 away from the inner end face 2111, so as to facilitate the seat 210 to provide support for the pole 220 through the annular flange 211. The inner end face 2111 of the annular flange 211 is arranged in a spaced manner with the wall portion 110 to form a spacing area P1. The inner annular face 2113 of the annular flange 211 surrounds a hollow area P2, and the pole 220 is exposed through the hollow area P2. It should be noted that the pole 220 exposed through the hollow area P2 can mean that the pole 220 is exposed on the side of the annular flange 211 close to the internal space of the shell assembly 100 through the hollow area P2.

[0058] The sealing ring 300 is arranged inside the annular flange 211 and surrounds the through hole 111. It can be understood that the sealing ring 300 has a certain elasticity and can be deformed to a certain extent under the action of an external force, and has good sealing performance, thereby facilitating sealing of the surrounding of the through hole 111. The pole column 220 presses the sealing ring 300 on the wall portion 110 in the axial direction x1 from the exposed part of the hollowed-out area P2. It can be understood that the exposed part of the pole column 220 can press the sealing ring 300 in cooperation with the wall portion 110 to make the sealing ring 300 deform to a certain extent, thereby improving the sealing effect of the sealing ring 300 on the sealing part between the wall portion 110 and the pole column 220. In the pressed state, the sealing ring 300 is further arranged in the interval area P1. It can be understood that in the pressed state, the sealing ring 300 is further arranged in the interval area P1, compared with the sealing ring 300 being arranged only in the area corresponding to the pole column 220 exposed through the hollowed-out area P2, the extension length of the sealing ring 300 connecting the outer wall surface of the pole column 220 and the wall portion 110 is increased, thereby prolonging the climbing path of the metal dendrites on the outer wall surface of the sealing ring 300 between the pole column 220 and the wall portion 110, so that the metal dendrites need to climb a longer path to possibly contact the pole column 220 and the wall portion 110 at the same time, thereby relieving the risk of short circuit between the wall portion 110 and the pole column 220.

[0059] Through the above embodiment, the inner end surface 2111 of the annular flange 211 is arranged in the interval area P1 to form the interval area P1. By arranging the interval area P1 and making the sealing ring 300 further arranged in the interval area P1 in the pressed state, the climbing path of the metal dendrites can be effectively prolonged, thereby relieving the risk of short circuit between the wall portion 110 and the pole column 220 caused by the metal dendrites.

[0060] In some embodiments, in the pressed state, the sealing ring 300 is in contact with the inner end surface 2111 and / or the inner annular surface 2113. For example, in the pressed state, the sealing ring 300 can be in contact with the inner end surface 2111 but not in contact with the inner annular surface 2113, or can be in contact with the inner annular surface 2113 but not in contact with the inner end surface 2111, or can be in contact with both the inner annular surface 2113 and the inner end surface 2111. It can be understood that, in the pressed state, the sealing ring 300 can be in contact with the inner end surface 2111 and / or the inner annular surface 2113 of the annular flange 211, so as to reduce the space between the outer wall surface of the sealing ring 300 and the inner end surface 2111 and the inner annular surface 2113, thereby blocking the climbing path of the metal dendrites exuded from the outer wall surface of the sealing ring 300. For example, in the case where the sealing ring 300 is in contact with the inner end surface 2111, in an ideal case, the sealing ring 300 is in full abutment with the inner end surface 2111 in the pressed state, and the gap space between the outer wall surface of the sealing ring 300 and the inner end surface 2111 is minimized, and in some application scenarios, the interval between the outer wall surface of the sealing ring 300 and the inner end surface 2111 at the contact position of the sealing ring 300 and the inner end surface 2111 can be considered to be 0, so that it is difficult for metal dendrites to form at the junction of the outer wall surface of the sealing ring 300 and the inner end surface 2111, i.e., the metal dendrites that can exist on both sides of the junction of the outer wall surface of the sealing ring 300 and the inner end surface 2111 are broken off when they climb to the junction, thereby blocking the metal dendrites from forming a continuous conductive path on the outer wall surface of the sealing ring 300. Further, in the pressed state, the sealing ring 300 is in contact with both the inner end surface 2111 and the inner annular surface 2113, i.e., the climbing path of the metal dendrites at the junction of the sealing ring 300 and the inner end surface 2111 is broken off, and the climbing path of the metal dendrites at the junction of the sealing ring 300 and the inner annular surface 2113 is also broken off, thereby further blocking the climbing path of the metal dendrites. Thus, in the pressed state, the sealing ring 300 is in contact with the inner end surface 2111 and / or the inner annular surface 2113, reduces the climbable space of the metal dendrites on the outer wall surface of the sealing ring 300, further blocks the climbing path of the metal dendrites, and thereby alleviates the risk of short circuit of the wall portion 110 and the pole 220 caused by the metal dendrites.

[0061] In some embodiments, in the compression state, the volume of the portion of the sealing ring 300 located in the spacing region P1 is less than the volume of the spacing region P1. That is, the spatial volume of the spacing region P1 is greater than the volume of the portion of the sealing ring 300 located in the spacing region P1 in the compression state, so that the spacing region P1 can provide sufficient spatial redundancy for the sealing ring 300. It should be noted that the compression of the sealing ring 300 by the pole post 220 can cause the sealing ring 300 to deform to a certain extent and generate volume flow, which can refer to the volume of the sealing ring 300 becoming smaller after deformation and the spatial position changing. In the state that the volume of the portion of the sealing ring 300 located in the spacing region P1 is less than the volume of the spacing region P1, the sealing ring 300 can obtain sufficient spatial redundancy in the spacing region P1 to meet the volume flow of the sealing ring 300 caused by the action of the pole post 220, so that the sealing ring 300 is fully compressed by the pole post 220. Conversely, if the volume of the spacing region P1 is equal to the volume of the portion of the sealing ring 300 located in the spacing region P1, the space of the spacing region P1 can not meet the volume flow of the sealing ring 300 caused by the compression of the pole post 220, thereby causing the sealing ring 300 to be insufficiently compressed and the risk of reduced sealing. Further, if the space available for accommodating the sealing ring 300 is insufficient, the sealing ring 300 will also be excessively compressed, causing the sealing ring 300 to deform to a certain extent, reducing the elasticity of the sealing ring 300, and in some application scenarios, the insufficient rebound of the sealing ring 300 when the battery cell 10 is in the EOL (End of Life, End of Life) state, thereby causing sealing failure. In the compression state, the volume of the portion of the sealing ring 300 located in the spacing region P1 is less than the volume of the spacing region P1, which alleviates the risk of limited compression of the sealing ring 300. Thus, by providing sufficient spatial redundancy for the sealing ring 300 through the spacing region P1, the sealing ring 300 can be fully compressed by the pole post 220, thereby alleviating the risk of insufficient compression of the sealing ring 300 and reduced sealing caused by insufficient space.

[0062] In some embodiments, the seat 210 further comprises a support portion 212, which is arranged around the outer periphery of the annular flange 211 and has a support surface 2121 supported on the wall portion 110 and a connecting surface 2122 connecting the support surface 2121 and the inner end surface 2111, the connecting surface 2122 is used to define the boundary of the interval region P1 along the radial direction x2 of the pole assembly 200, and the part of the sealing ring 300 located in the interval region P1 is arranged in contact with the inner end surface 2111 and spaced apart from the connecting surface 2122. The support portion 212 can provide support for the annular flange 211 to space the inner end surface 2111 of the annular flange 211 from the wall portion 110, and the support portion 212 is in contact with and supported on the wall portion 110 through the support surface 2121, so that the stability of the seat 210 can be improved through the support surface 2121. The connecting surface 2122 is connected with the support surface 2121 and the inner end surface 2111 and is used to define the boundary of the interval region P1 along the radial direction x2 of the pole assembly 200, and it should be noted that the radial direction x2 refers to the direction perpendicular to the axial direction x1 of the pole assembly 200, and it is not limited that the pole assembly 200 must be circular, and the pole assembly 200 can be any shape including but not limited to circular, square, etc. It can be understood that the farther the interval distance between the connecting surface 2122 and the inner annular surface 2113 in the radial direction x2 of the pole assembly 200, the farther the interval distance between the boundary of the interval region P1 away from the inner annular surface 2113 side and the inner annular surface 2113 in the radial direction x2 of the pole assembly 200. The part of the sealing ring 300 located in the interval region P1 is in contact with the inner end surface 2111 and spaced apart from the connecting surface 2122, so that the metal dendrite climbing path at the junction of the sealing ring 300 and the inner end surface 2111 is broken, and at the same time, sufficient space redundancy can be provided for the sealing ring 300. Thus, the sealing ring 300 is in contact with the inner end surface 2111, reducing the climbable space of metal dendrites on the outer wall surface of the sealing ring 300, blocking the climbing path of metal dendrites, and at the same time, the sealing ring 300 is spaced apart from the connecting surface 2122, improving the space redundancy, relieving the risk of limited compression of the sealing ring 300 due to insufficient space and the risk of reduced sealing performance.

[0063] In some embodiments, the sealing ring 300 is arranged to be deformed to extend into the spacing area P1 under the pressing of the pole assembly 200. For example, the sealing ring 300 can be located entirely outside the spacing area P1 in a natural state, which can refer to a state without any external force, or a state with only gravity and a support force balanced with the gravity. In the present embodiment, it can also be understood as a state without the pressing of the pole assembly 200. The sealing ring 300 is arranged to be deformed to extend into the spacing area P1 under the pressing of the pole assembly 200, i.e., the sealing ring 300 is transformed from the natural state to the pressing state of the pole assembly 200, and the sealing ring 300 is elastically deformed and deformed to extend into the spacing area P1. Thus, the part of the sealing ring 300 located in the spacing area P1 can be formed by the deformation of the sealing ring 300 itself, which is simple in structure and reduces production cost.

[0064] In some embodiments, in a natural state, the sealing ring 300 includes a main body part 310 located inside the annular flange 211 and an extension part 320 located in the spacing area P1, and the exposed part of the pole 220 presses the main body part 310 on the wall part 110. The natural state can refer to a state without any external force, or a state with only gravity and a support force balanced with the gravity. In the present embodiment, it can also be understood as a state without the pressing of the pole assembly 200. The exposed part of the pole 220 presses the main body part 310 on the wall part 110, and the sealing ring 300 can be arranged in the spacing area P1 through the extension part 320, thereby facilitating the pre-setting of the size of the extension part 320 located in the spacing area P1, and more easily controlling the size of the outer wall surface of the extension part 320 in the spacing area P1. Thus, by pre-setting the extension part 320 located in the spacing area P1, it is easier to control the increase amount of the climbing path, and at the same time, it can alleviate the risk of the sealing ring 300 being excessively compressed and leading to a decrease in sealing performance.

[0065] In some embodiments, the inner end surface 2111 is configured to press the extension portion 320 against the wall portion 110, and the compression distance of the main body portion 310 along the axial direction x1 is greater than the compression distance of the extension portion 320 along the axial direction x1. The inner end surface 2111 presses the extension portion 320 against the wall portion 110, for example, the inner end surface 2111 presses the extension portion 320 against the wall portion 110, so as to reduce the space between the outer wall surface of the extension portion 320 and the inner end surface 2111, so as to block the climbing path of the metal dendrites exuded from the outer wall surface of the extension portion 320. In an ideal case, the inner end surface 2111 is in full abutment with the extension portion 320, the gap space between the outer wall surface of the extension portion 320 and the inner end surface 2111 is minimized, and in some application scenarios, the gap between the outer wall surface of the extension portion 320 and the inner end surface 2111 can be considered as 0, so that it is difficult for the metal dendrites to form at the junction of the outer wall surface of the extension portion 320 and the inner end surface 2111, that is, the metal dendrites that may exist on both sides of the junction of the outer wall surface of the extension portion 320 and the inner end surface 2111 are broken at the junction, thereby blocking the metal dendrites from forming a continuous conductive path on the outer wall surface of the extension portion 320. The compression distance can refer to the height of the sealing ring 300 along the axial direction x1 of the pole assembly 200 in a natural state minus the height of the sealing ring 300 along the axial direction x1 of the pole assembly 200 in a pressed state, and the compression distance of the main body portion 310 along the axial direction x1 is greater than the compression distance of the extension portion 320 along the axial direction x1, so that the main body portion 310 is more fully compressed. In some embodiments, the height of the extension portion 320 along the axial direction x1 is less than the height of the main body portion 310 along the axial direction x1 in a natural state. In this way, the inner end surface 2111 presses the extension portion 320, which can improve the blocking effect of the metal dendrite climbing path, further alleviate the risk of short circuit of the wall portion 110 and the pole 220 caused by the metal dendrites, and the compression distance of the main body portion 310 is greater than the compression distance of the extension portion 320, so that the main body portion 310 is fully compressed, and the sealing effect is improved.

[0066] In some embodiments, in combination with Figure 8 The wall portion 110 is provided with a groove 112, which is arranged at the periphery of the through hole 111 and is used to accommodate the sealing ring 300 in the pressed state. It can be understood that at least part of the sealing ring 300 can be accommodated in the groove 112 in the pressed state. The groove 112 can be recessed compared to the pole assembly 200. The shape of the groove 112 can be similar to that of the sealing ring 300, for example, the shapes of the groove 112 and the sealing ring 300 can both be annular, so that the sealing ring 300 is accommodated and positioned through the groove 112. In this way, the groove 112 can provide more compression space for the sealing ring 300, thereby alleviating the risk of limited compression of the sealing ring 300 due to insufficient space, resulting in a decrease in sealing performance.

[0067] In some embodiments, the projection of the groove 112 along the axial direction x1 at least partially overlaps with the spacing region P1. Illustratively, the projection of the groove 112 along the axial direction x1 can partially overlap with the spacing region P1, or the projection of the groove 112 along the axial direction x1 can completely overlap with the spacing region P1. Thus, the groove 112 can accommodate the portion of the sealing ring 300 located in the spacing region P1, to provide more redundant space for the portion of the sealing ring 300 located in the spacing region P1, to alleviate the risk of insufficient compression of the sealing ring 300 due to insufficient space. In this way, the sealing effect of the portion of the sealing ring 300 pressed by the exposed portion of the pole post 220 can be improved by accommodating the portion of the sealing ring 300 in the spacing region P1 through the groove 112.

[0068] In some embodiments, the depth of the groove 112 increases in the radial direction x2 of the pole post assembly 200 and away from the through hole 111. Illustratively, at least part of the depth of the groove 112 gradually increases in the radial direction x2 of the pole post assembly 200 and away from the through hole 111. In some application scenarios, the groove 112 can include a first groove segment and a second groove segment arranged in the radial direction x2 of the pole post assembly 200 and away from the through hole 111, the depth of the first groove segment gradually increases in the radial direction x2 of the pole post assembly 200 and away from the through hole 111, and the depth of the second groove segment remains constant in the radial direction x2 of the pole post assembly 200 and away from the through hole 111. In this way, the groove 112 gradually increases the accommodation amount of the sealing ring 300 in the radial direction x2 of the pole post assembly 200 and away from the through hole 111, so that the sealing ring 300 can sufficiently extend into the spacing region P1 in the pressed state.

[0069] In summary, the battery cell 10 provided by the application comprises a shell assembly 100, a pole assembly 200 and a sealing ring 300. The shell assembly 100 comprises a wall portion 110, and the wall portion 110 is provided with a through hole 111. The pole assembly 200 is fixed to the wall portion 110 and covers the through hole 111. The pole assembly 200 comprises a seat 210 and a pole 220 arranged on the seat 210. The seat 210 comprises an annular flange 211, which has an inner end face 2111 and an outer end face 2112 arranged opposite to each other along an axial direction x1 of the pole assembly 200, and an inner annular face 2113 connecting the inner end face 2111 and the outer end face 2112. The pole 220 is arranged on a side of the outer end face 2112 away from the inner end face 2111. The inner end face 2111 is arranged in a spaced manner with the wall portion 110 to form a spacing area P1. The pole 220 is exposed from a hollow area P2 formed by the inner annular face 2113. The sealing ring 300 is arranged inside the annular flange 211 and surrounds the through hole 111. The exposed part of the pole 220 from the hollow area P2 presses the sealing ring 300 on the wall portion 110 along the axial direction x1. In the pressing state, the sealing ring 300 is further arranged in the spacing area P1. Thus, the inner end face 2111 of the annular flange 211 is arranged in a spaced manner with the wall portion 110 to form the spacing area P1. By arranging the spacing area P1 and arranging the sealing ring 300 in the spacing area P1 in the pressing state, the climbing path of the metal dendrites can be effectively prolonged, so as to alleviate the risk of short circuit of the wall portion 110 and the pole 220 caused by the metal dendrites. Compared with other types of battery cells, the battery cell 10 provided by the application has higher reliability.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the specification of the application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing assembly comprising a wall portion provided with a through hole; a pole assembly fixed to the wall portion and covering the through hole, the pole assembly comprising a seat and a pole provided on the seat, the seat comprising an annular flange having an inner end face and an outer end face arranged opposite to each other along an axial direction of the pole assembly and an inner annular surface connecting the inner end face and the outer end face, the pole being provided on a side of the outer end face away from the inner end face, the inner end face being arranged spaced apart from the wall portion to form a spacing region, and the pole being exposed from a hollow region formed by the inner annular surface; a sealing ring provided inside the annular flange and surrounding the through hole, the pole being arranged to press the sealing ring against the wall portion along the axial direction in a pressed state, and the sealing ring being further arranged in the spacing region in the pressed state.

2. The battery cell of claim 1, wherein, In the pressed state, the sealing ring is in contact with the inner end face and / or the inner annular surface.

3. The battery cell of claim 1, wherein, In the pressed state, a volume of the portion of the sealing ring located in the spacing region is less than a volume of the spacing region.

4. The battery cell of claim 3, wherein, The seat further comprises a support portion surrounding an outer periphery of the annular flange and having a support surface arranged to support the wall portion and a connecting surface connecting the support surface and the inner end face, the connecting surface being arranged to define a boundary of the spacing region along a radial direction of the pole assembly, and the portion of the sealing ring located in the spacing region being arranged in contact with the inner end face and spaced apart from the connecting surface.

5. The battery cell according to any one of claims 1 to 4, characterized in that The sealing ring is arranged to be deformed to extend into the spacing region under the pressing action of the pole assembly.

6. The battery cell of any one of claims 1-4, wherein, In a natural state, the sealing ring comprises a main body portion located inside the annular flange and an extension portion located in the spacing region, and the exposed portion of the pole is arranged to press the main body portion against the wall portion.

7. The battery cell of claim 6, wherein, The inner end face is arranged to press the extension portion against the wall portion, and a compression distance of the main body portion along the axial direction is greater than a compression distance of the extension portion along the axial direction.

8. The battery cell of any one of claims 1-4, wherein, The wall portion is provided with a groove arranged around the through hole and arranged to accommodate the sealing ring in the pressed state.

9. The battery cell of claim 8, wherein, A projection of the groove along the axial direction at least partially overlaps the spacing region.

10. The battery cell of claim 8, wherein, A depth of the groove increases in a direction away from the through hole along a radial direction of the pole assembly.

11. A battery device characterized by comprising: The battery device comprises the battery cell according to any one of claims 1-10.

12. An electrical device, characterized by The electric appliance comprises the battery device according to claim 11.

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