Battery cell and manufacturing method therefor, battery, energy storage device, and electric device

Abstract

The present disclosure relates to the technical field of batteries. Disclosed are a battery cell and a manufacturing method therefor, a battery, an energy storage device, and an electric device. The battery cell comprises: a casing, the casing being provided with an accommodating cavity, and a first wall of the casing being provided with pole mounting holes; an electrode assembly, the electrode assembly being accommodated in the accommodating cavity; poles, at least part of each pole penetrating into the corresponding pole mounting hole and being connected to the electrode assembly; and seal rings, each seal ring being at least partially sandwiched between the outer peripheral surface of the corresponding pole and the inner wall of the corresponding pole mounting hole. Each seal ring in the battery cell is at least partially sandwiched between the outer peripheral surface of the corresponding pole and the inner wall of the corresponding pole mounting hole, so that the height space occupied by the seal ring can be reduced, thereby improving the volumetric energy density of battery cells.

Description

Battery cell and manufacturing method thereof, battery, energy storage device and electric device

[0001] Cross-reference to Related Applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202410430440.4, filed on April 10, 2024, entitled “Battery cell and manufacturing method thereof, battery, energy storage device and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a battery cell and manufacturing method thereof, a battery, an energy storage device and an electric device. BACKGROUND

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used, and batteries are also increasingly used in the field of energy storage and the like. In new energy vehicles equipped with batteries, the batteries can be used to provide all or part of the power. In the field of energy storage, the batteries can be installed in an energy storage box or directly installed at a user side.

[0005] With the continuous development of battery technology, the industry continues to demand higher volume energy density for batteries. SUMMARY

[0006] To solve the above technical problems, the present disclosure provides a battery cell with high volume energy density and a manufacturing method thereof, a battery, an energy storage device and an electric device.

[0007] The present disclosure is achieved by the following technical solutions.

[0008] A first aspect of the present disclosure provides a battery cell, comprising: a shell, the shell having a receiving cavity, a first wall of the shell being provided with a pole mounting hole; an electrode assembly, the electrode assembly being received in the receiving cavity; a pole, at least part of the pole being arranged in the pole mounting hole and connected to the electrode assembly; and a sealing ring, at least part of the sealing ring being clamped between an outer circumferential surface of the pole and an inner wall of the pole mounting hole.

[0009] In the battery cell provided by the embodiments of the present disclosure, at least part of the sealing ring is clamped between the outer circumferential surface of the pole and the inner wall of the pole mounting hole, which can reduce the occupation of the sealing ring to the height space and improve the volume energy density of the battery cell.

[0010] In some embodiments, the battery cell further comprises a fixing structure, and the pole is fixed to the first wall by the fixing structure.

[0011] The fixed structure is arranged, the fixed connection between the pole and the first wall of the shell is realized, the sealing ring is clamped more firmly between the outer circumferential surface of the pole and the inner wall of the pole mounting hole, the occupation of the sealing ring to the height space is reduced, and the volume energy density of the battery monomer can be improved.

[0012] In some embodiments, one of the outer circumferential surface of the pole and the inner circumferential surface of the fixed structure is provided with a recess, and the other is provided with a protrusion, and the protrusion is engaged in the recess.

[0013] In this way, the connection strength of the pole and the fixed structure is improved through the engagement of the recess and the protrusion, which is conducive to improving the connection strength of the pole and the shell; at the same time, since the sealing ring is clamped between the outer circumferential surface of the pole and the inner wall of the pole mounting hole, the occupation of the sealing ring to the height space is reduced, and the volume energy density of the battery monomer can be improved.

[0014] In some embodiments, the fixed structure includes a first fixed structure and a second fixed structure connected to the outer surface and the inner surface of the first wall respectively, and the first fixed structure and the second fixed structure are connected to the outer circumferential surface of the pole respectively, and the first fixed structure and the second fixed structure are connected to the two ends of the sealing ring along the axial direction of the pole respectively.

[0015] In this way, the connection strength of the fixed structure and the pole is improved, which is conducive to improving the connection strength of the pole and the shell; moreover, the first fixed structure and the second fixed structure fix the position of the sealing ring in the axial direction of the pole, improve the firmness of the sealing ring, improve the sealing performance of the sealing ring to the pole, thereby reducing the probability of electrolyte leakage, and prolonging the service life of the battery monomer; at the same time, since the sealing ring is clamped between the outer circumferential surface of the pole and the inner wall of the pole mounting hole, the occupation of the sealing ring to the height space is reduced, and the volume energy density of the battery monomer can be improved.

[0016] In some embodiments, the first fixed structure and the second fixed structure are both made of insulating materials.

[0017] In this way, the function of fixing the pole by the fixed structure is realized, and the pole and the shell can be insulated, and the normal function of the battery monomer is realized.

[0018] In some embodiments, the inner circumferential surface of the first fixed structure and the second fixed structure is provided with at least one protrusion, and the outer circumferential surface of the pole is provided with at least two recesses, and each protrusion is engaged in each recess one by one.

[0019] In this way, the connection strength of the first fixed structure and the second fixed structure and the pole is improved, thereby improving the connection strength of the pole and the shell. Moreover, since the sealing ring is clamped between the outer circumferential surface of the pole and the inner wall of the pole mounting hole, the occupation of the sealing ring to the height space is reduced, and the volume energy density of the battery monomer can be improved.

[0020] In some embodiments, the outer surface of the first wall is provided with an engaging protrusion, and the first fixing structure is provided with an engaging slot engaging with the engaging protrusion.

[0021] In this way, the connection strength of the shell and the first fixing structure is improved, thereby improving the structural strength of the battery monomer; and since the sealing ring is clamped between the outer circumferential surface of the pole and the inner wall of the pole mounting hole, the sealing ring occupies less height space, and the volumetric energy density of the battery monomer can be improved.

[0022] In some embodiments, at least two pole columns are provided, and a sealing ring is clamped between each pole column and the inner wall of the pole mounting hole through which the pole column passes, the at least two pole columns including a first pole column and a second pole column, the first pole column being connected to the negative tab of the electrode assembly, and the second pole column being connected to the positive tab of the electrode assembly.

[0023] The first pole column is connected to the negative tab of the electrode assembly, and the second pole column is connected to the positive tab of the electrode assembly, so that the first pole column serves as the negative pole column of the battery monomer, and the second pole column serves as the positive pole column of the battery monomer. The sealing rings of the positive pole column and the negative pole column are both radially sealed, reducing the occupation of height space by the sealing rings, and the volumetric energy density of the battery monomer can be improved.

[0024] In some embodiments, the first pole column includes a first column body portion and a second column body portion connected to the first column body portion, one end of the second column body portion away from the first column body portion being connected to the negative tab, and the first column body portion and the second column body portion being made of different conductive materials, the first column body portion being made of aluminum material.

[0025] The first pole column serves as the negative pole column of the battery monomer, and the second column body portion is interposed between the first column body portion and the accommodation cavity, so that the electrolyte in the accommodation cavity is less likely to contact the first column body portion. Therefore, the first column body portion made of aluminum material is less likely to be corroded due to contact with the electrolyte, and the cost of the aluminum material is relatively low, so that the material cost of the battery monomer can be reduced. Furthermore, one end of the first column body portion close to the accommodation cavity is inserted into the groove of the second column body portion, further reducing the probability of contact between the first column body portion and the electrolyte in the accommodation cavity, and further reducing the probability of corrosion of the aluminum material by the electrolyte.

[0026] In some embodiments, the second column body portion is made of copper material.

[0027] The copper material is less likely to be oxidized by the electrolyte, that is, the electrolyte is less likely to corrode the copper material. Therefore, the second column body portion close to the electrolyte is made of copper material, which can reduce the probability of corrosion of the first pole column by the electrolyte, thereby prolonging the service life of the battery monomer.

[0028] In some embodiments, the surface of the second columnar portion facing away from the accommodating cavity is formed with a groove, and the first columnar portion is partially inserted into the groove.

[0029] In the battery cell provided by the embodiments of the present disclosure, the portion of the first columnar portion is partially inserted into the groove of the second columnar portion, which can increase the contact area between the first columnar portion and the second columnar portion, thereby improving the connection strength of the two. In addition, when an external force is applied in a direction perpendicular to the insertion direction of the first columnar portion and the second columnar portion, the portion of the first columnar portion and the groove of the second columnar portion form an engagement, so that the first pole column is not easy to deform or break at the connection between the first columnar portion and the second columnar portion, thereby improving the structural strength of the first pole column, and further improving the structural strength of the battery cell.

[0030] In some embodiments, the groove does not penetrate to the surface of the second columnar portion facing the accommodating cavity, and does not penetrate to the outer peripheral surface of the second columnar portion.

[0031] In this way, the second columnar portion blocks between the accommodating cavity and the first columnar portion, reducing the probability of the electrolyte contacting the first columnar portion, thereby reducing the probability of the first columnar portion being corroded, thereby facilitating the extension of the service life of the battery cell.

[0032] In some embodiments, the outer peripheral surface of the second columnar portion is provided with at least one recess, and the recess provided on the second columnar portion does not penetrate to the inner wall of the groove.

[0033] In this way, the connection strength of the second columnar portion and the fixing structure is improved, and the recess does not penetrate to the inner wall of the groove, which can reduce the probability of the electrolyte entering the groove to contact the first columnar portion, thereby reducing the probability of the first columnar portion being corroded, thereby extending the service life of the battery cell.

[0034] In some embodiments, the minimum distance between the surface of the second columnar portion facing the accommodating cavity and the inner wall of the groove facing away from the accommodating cavity is not less than 1 mm.

[0035] In this way, the portion of the second columnar portion blocking between the first columnar portion and the accommodating cavity is relatively thick, which reduces the probability of the second columnar portion penetrating this portion when being welded with the first columnar portion, thereby reducing the probability of the first columnar portion being corroded, thereby facilitating the extension of the service life of the battery cell.

[0036] In some embodiments, the first columnar portion includes a base portion and an insertion portion connected to one end of the base portion facing the accommodating cavity, the insertion portion is partially inserted into the groove, the outer peripheral edge of the base portion exceeds the insertion portion and forms a flange surface facing the accommodating cavity at the connection between the two, the flange surface and the end surface of the second columnar portion facing away from the accommodating cavity combine to form a first interface, the surface of the sealing ring facing away from the accommodating cavity and the first fixing structure combine to form a second interface, and the first interface is staggered from the second interface on the side away from the accommodating cavity.

[0037] The formation of the first interface further increases the contact area between the first columnar portion and the second columnar portion, thereby further improving the structural strength of the pole and the structural strength of the battery cell. The first interface is offset from the second interface away from the accommodation cavity, so that the sealing ring is in contact with the second columnar portion and not in contact with the first columnar portion, so that the electrolyte is less likely to contact the first columnar portion, further prolonging the service life of the battery cell.

[0038] The second aspect of the present disclosure provides a battery, comprising at least one battery cell as described above.

[0039] Since the battery comprises the battery cell provided by the first aspect, the battery comprises all the beneficial effects of the battery cell, so that the volumetric energy density of the battery is improved.

[0040] The third aspect of the present disclosure provides an energy storage device, comprising the battery cell as described above or the battery as described above.

[0041] Since the battery cell provided by the first aspect or the battery provided by the second aspect has a high volumetric energy density, the occupation of space in the energy storage device can be reduced or a higher total energy can be stored in a limited space.

[0042] The fourth aspect of the present disclosure provides an electric device, comprising the battery cell as described above or the battery as described above for providing electric energy.

[0043] Since the battery cell provided by the first aspect or the battery provided by the second aspect has a high volumetric energy density, the occupation of space in the electric device can be reduced or a higher total energy can be provided in a limited space.

[0044] The fifth aspect of the present disclosure provides a manufacturing method of a battery cell, comprising:

[0045] Providing a housing, an electrode assembly, a pole and a sealing ring, the first wall of the housing is provided with a pole mounting hole;

[0046] The sealing ring is sleeved on the outer peripheral side of the pole to obtain a first structure;

[0047] The first wall is sleeved on the outer peripheral side of the sealing ring through the pole mounting hole to obtain a second structure;

[0048] The sealing ring in the second structure is clamped between the outer peripheral surface of the pole and the inner wall of the pole mounting hole.

[0049] The battery cell manufactured by the method for manufacturing a battery cell provided by the embodiments of the present disclosure has at least part of the sealing ring clamped between the outer circumferential surface of the pole and the inner wall of the pole mounting hole, which can reduce the occupation of the sealing ring to the height space, and can improve the volumetric energy density of the battery cell.

[0050] In some embodiments, after obtaining the second structure, further comprising:

[0051] The second structure is injection molded to form a fixing structure connecting the pole and the first wall.

[0052] The fixing structure formed by injection molding enables the pole to be fixedly connected to the first wall of the shell, so that the sealing ring is clamped more firmly between the outer circumferential surface of the pole and the inner wall of the pole mounting hole, the occupation of the sealing ring to the height space is reduced, and the volumetric energy density of the battery cell can be improved.

[0053] Inventive Effects

[0054] Through the present disclosure, a battery cell with high volumetric energy density and a manufacturing method thereof, a battery, an energy storage device, and an electric device can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0055] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0056] FIG. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present disclosure;

[0057] FIG. 2 is a perspective exploded schematic diagram of a battery provided by some embodiments of the present disclosure;

[0058] FIG. 3 is a perspective structural schematic diagram of a battery cell provided by some embodiments of the present disclosure;

[0059] FIG. 4 is an exploded structural schematic diagram of a battery cell provided by some embodiments of the present disclosure;

[0060] FIG. 5 is a perspective structural schematic diagram of an end cover of a battery cell provided by some embodiments of the present disclosure;

[0061] FIG. 6 is a perspective exploded schematic diagram of the structure of the end cover of a battery cell provided by some embodiments of the present disclosure;

[0062] FIG. 7 is a sectional view of a first pole provided by some embodiments of the present disclosure;

[0063] FIG. 8 is a sectional view of the structure at the first pole of a battery cell provided by some embodiments of the present disclosure;

[0064] FIG. 9 is a cross-sectional view of a second pole post, according to some embodiments of the present disclosure;

[0065] FIG. 10 is a cross-sectional view of a first fixing structure, according to some embodiments of the present disclosure;

[0066] FIG. 11 is a cross-sectional view of a second fixing structure, according to some embodiments of the present disclosure;

[0067] FIG. 12 is a flowchart of a method of manufacturing a battery cell, according to some embodiments of the present disclosure.

[0068] BRIEF DESCRIPTION OF THE DRAWINGS 1000 vehicle; 100 battery; 200 controller; 300 motor; 10 battery box; 101 box cover; 102 box body; 20 battery cell; 1 shell; 11 end cover; 111 pole post mounting hole; 112 engagement protrusion; 113 pressure relief mechanism; 114 insulation structure; 115 pressure relief mechanism protection patch; 12 housing; 13 current collector; 2 electrode assembly; 21 negative electrode tab; 22 positive electrode tab; 3 pole post; 3a first pole post; 3b second pole post; 31 first post body portion; 311 recessed portion; 312 base portion; 313 insertion portion; 314 first interface; 32 second post body portion; 4 sealing ring; 41 second interface; 5 fixing structure; 51 first fixing structure; 511 protruding portion; 512 engagement slot; 52 second fixing structure; 6 bottom support plate; 7 insulation sheet; 8 top cover patch; 9 blue film. DETAILED DESCRIPTION

[0069] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0070] 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 present disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure; the terms "include" and "have" and any variations thereof used in the specification and the above drawings description are intended to cover the non-exclusive inclusion.

[0071] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like 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 technical features indicated. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0072] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0073] In the description of the embodiments of the disclosure, 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 front and rear associated objects.

[0074] In the description of the embodiments of the disclosure, the technical terms“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“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 disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, operate or be used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the disclosure.

[0075] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.

[0076] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical term“contact” should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0077] The disclosure will be described in detail below.

[0078] At present, new energy batteries are increasingly widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric transportation tools, aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0079] In the embodiments of the present disclosure, the battery can be a battery monomer.

[0080] The inventors of the present disclosure noticed that the existing top cover is assembled and sealed by adopting the way of axially compressing the sealing ring, that is, the sealing ring is clamped between the shaft end face of the pole and the shell, which occupies a large height space size, resulting in a low energy density of the battery monomer. The inventors of the present disclosure found through research that instead of sealing in the axial direction, sealing in the radial direction, that is, the sealing ring is clamped between the outer circumferential surface of the pole and the inner wall of the pole mounting hole, can reduce the occupation of the sealing ring to the height space, and can improve the volume energy density of the battery monomer.

[0081] Based on such design concept, the inventors of the present disclosure designed a battery monomer, which comprises a shell, an electrode assembly, a pole and a sealing ring. The shell has a containing cavity, and a first wall of the shell is provided with a pole mounting hole. The electrode assembly is contained in the containing cavity. At least part of the pole is arranged in the pole mounting hole and connected to the electrode assembly. At least part of the sealing ring is clamped between the outer circumferential surface of the pole and the inner wall of the pole mounting hole.

[0082] The sealing ring is clamped at least partially between the outer circumferential surface of the pole and the inner wall of the pole mounting hole, which can reduce the occupation of the sealing ring to the height space, and can improve the volume energy density of the battery monomer.

[0083] The battery monomer provided by the embodiments of the present disclosure can be used in, but not limited to, an electric device or an energy storage device. The electric device can be, but not limited to, a vehicle, a ship or an aircraft, etc. For example, a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The energy storage device can be, but not limited to, an energy storage container, an energy storage cabinet, etc.

[0084] The present disclosure also provides a battery, which can include one or more battery monomers to provide a single physical module with higher voltage and capacity. When there are multiple battery monomers, the multiple battery monomers are connected in series, in parallel or in a hybrid manner through a current combining component.

[0085] In some embodiments of the present disclosure, the battery can be a battery module, and when there are multiple battery monomers, the multiple battery monomers are arranged and fixed to form a battery module.

[0086] In some embodiments of the present disclosure, the battery can be a battery pack, the battery pack comprising a battery box and battery cells, the battery cells or battery modules being accommodated in the battery box.

[0087] In some embodiments of the present disclosure, the battery box can be part of the chassis structure of the vehicle. For example, part of the battery box can be part of the floor of the vehicle, or part of the battery box can be part of the cross beam and longitudinal beam of the vehicle.

[0088] The battery provided by the embodiments of the present disclosure can be used in, but is not limited to, an electric device or an energy storage device. The electric device can be, but is not limited to, a vehicle, a ship or an aircraft, etc. For example, a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, etc.

[0089] The embodiments of the present disclosure further provide an energy storage device. The energy storage device comprises a battery cell or a battery.

[0090] The energy storage device provided by the embodiments of the present disclosure can be, but is not limited to, an energy storage container, an energy storage cabinet, etc.

[0091] The embodiments of the present disclosure further provide an electric device. The electric device comprises a battery cell or a battery for providing electric energy.

[0092] The electric device provided by the embodiments of the present disclosure can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, for example, a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spaceship, etc.

[0093] In the following embodiments, for the convenience of description, the electric device of an embodiment of the present disclosure is taken as a vehicle 1000 for example. The following is described in conjunction with the accompanying drawings.

[0094] FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present disclosure.

[0095] The vehicle 1000 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. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0096] In some embodiments of the present disclosure, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0097] FIG. 2 is a perspective exploded schematic view of the battery 100 provided by an embodiment of the present disclosure.

[0098] As shown in FIG. 2, the battery 100 includes a battery box 10 and at least one battery cell 20, and the battery box 10 is internally provided with an accommodating space, and the at least one battery cell 20 is accommodated in the accommodating space.

[0099] In some embodiments of the present disclosure, the battery box 10 includes a box body 102 and a box cover 101, and the box cover 101 covers the box body 102, so as to form the accommodating space between the box body 102 and the box cover 101.

[0100] The box body 102 can be a hollow structure with one end open, and the box cover 101 can be a plate-shaped structure, which is combined with the open side of the box body 102 to jointly define the accommodating space; alternatively, the box cover 101 and the box body 102 can both be hollow structures with one side open, and the open side of the box cover 101 is combined with the open side of the box body 102. Of course, the battery box 10 formed by the box cover 101 and the box body 102 can have various shapes, such as a cylinder, a cuboid, etc.

[0101] The battery cell 20 refers to the smallest unit constituting a battery. In the battery 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series or in parallel or in a mixed manner. The mixed manner refers to that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series or in parallel or in a mixed manner, and then the whole of the multiple battery cells 20 is placed in the accommodating space formed by the box body 102 and the box cover 101. Of course, the battery 100 can also be that the multiple battery cells 20 are first 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 accommodating space formed by the box body 102 and the box cover 101. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0102] In the embodiments of the present disclosure, the battery cell 20 can be a secondary battery. The secondary battery refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0103] The battery cell 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present disclosure are not limited thereto.

[0104] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to FIGS. 3 to 12.

[0105] FIG. 3 is a perspective structural schematic view of a battery cell provided by some embodiments of the present disclosure; FIG. 4 is an exploded structural schematic view of a battery cell provided by some embodiments of the present disclosure; FIG. 5 is a perspective structural schematic view of an end cover of a battery cell provided by some embodiments of the present disclosure; FIG. 6 is a perspective exploded schematic view of a structure at an end cover of a battery cell provided by some embodiments of the present disclosure; FIG. 7 is a sectional view of a first pole provided by some embodiments of the present disclosure; FIG. 8 is a sectional view of a structure at a first pole of a battery cell provided by some embodiments of the present disclosure; FIG. 9 is a sectional view of a second pole provided by some embodiments of the present disclosure; FIG. 10 is a sectional view of a first fixing structure provided by some embodiments of the present disclosure; and FIG. 11 is a sectional view of a second fixing structure provided by some embodiments of the present disclosure.

[0106] A first aspect of the present disclosure provides a battery cell 20 as shown in FIGS. 3 to 8. The battery cell 20 includes a housing 1, an electrode assembly 2, a pole 3, and a sealing ring 4. The housing 1 has an accommodating cavity. A first wall of the housing 1 is provided with a pole mounting hole 111. The electrode assembly 2 is accommodated in the accommodating cavity. At least part of the pole 3 is arranged in the pole mounting hole 111 and is connected to the electrode assembly 2. The sealing ring 4 is at least partially clamped between the outer circumferential surface of the pole 3 and the inner wall of the pole mounting hole 111.

[0107] The electrode assembly 2 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 2 can be contained within the case 1. The electrode assembly 2 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet each have a portion with an active material constituting a main body of the electrode assembly, and a portion without the active material constituting a tab. The positive electrode tab 22 and the negative electrode tab 21 can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with an electrolyte, and the pole 3 is connected to the positive electrode tab 22 or the negative electrode tab 21.

[0108] The pole 3 is used to be mounted to the case 1 of the battery cell 20 and electrically connected to the electrode assembly 2 to output the electric energy generated by the electrode assembly 2. The pole 3 can be directly connected to the positive electrode tab 22 or the negative electrode tab 21 of the electrode assembly 2, or indirectly connected through the current collector 13. The pole 3 is made of an electrically conductive material to achieve the electrically conductive function. One pole 3 can be provided, which is connected to one of the positive electrode tab 22 and the negative electrode tab 21, and the other of the positive electrode tab 22 and the negative electrode tab 21 is connected to the case 1. Two or more poles 3 can be provided, at least one of which is connected to the positive electrode tab 22, and the rest of which is connected to the negative electrode tab 21. When two or more poles 3 are provided, a sealing ring 4 is clamped between each pole 3 and the inner wall of the pole mounting hole 111 in which the pole 3 is arranged.

[0109] The sealing ring 4 can be clamped only partially between the outer circumferential surface of the pole 3 and the inner wall of the pole mounting hole 111, or can be clamped entirely between the outer circumferential surface of the pole 3 and the inner wall of the pole mounting hole 111.

[0110] In the battery cell 20 provided by the embodiments of the present disclosure, at least part of the sealing ring 4 is clamped between the outer circumferential surface of the pole 3 and the inner wall of the pole mounting hole 111, which can reduce the occupation of the height space by the sealing ring 4 and improve the volumetric energy density of the battery cell 20.

[0111] In some embodiments of the present disclosure, as shown in FIGS. 3 and 4, the case 1 includes an end cover 11 and a shell 12, the shell 12 has a receiving cavity and an opening, the electrode assembly 2 is arranged in the receiving cavity, the end cover 11 closes the opening of the shell 12, and the first wall in which the pole mounting hole 111 is arranged can be any wall surface of the shell 12 or the end cover 11, that is, the pole 3 can be arranged on any wall surface of the shell 12 or the end cover 11.

[0112] The end cover 11 refers to a component that is covered on the opening of the shell 12 to isolate the internal environment of the battery monomer 20 from the external environment. Without limitation, the shape of the end cover 11 can be adapted to the shape of the shell 12 to fit the shell 12. Alternatively, the end cover 11 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 11 is not easily deformed when subjected to extrusion collision, so that the battery monomer 20 can have higher structural strength, and the safety performance can also be improved. The pole 3 is electrically connected to the electrode assembly 2 for outputting or inputting the electric energy of the battery monomer 20.

[0113] In some embodiments of the present disclosure, as shown in FIG. 6, the end cover 11 can also be provided with a pressure relief mechanism 113 for relieving the internal pressure when the internal pressure or temperature of the battery monomer 20 reaches a threshold value. The pressure relief mechanism 113 can be, but is not limited to, a pressure relief valve, and the outer side of the pressure relief mechanism 113 is attached with a pressure relief mechanism protection patch 115. The material of the end cover 11 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present disclosure do not have special restrictions thereon. In some embodiments of the present disclosure, an insulating structure 114 can also be provided on the inner side of the end cover 11. The insulating structure 114 can be used to isolate the electrical connection components in the shell 12 from the end cover 11 to reduce the risk of short circuit. Exemplarily, the insulating structure 114 can be plastic, rubber, etc.

[0114] The shell 12 is a component for fitting the end cover 11 to form the internal environment of the battery monomer 20, wherein the formed internal environment can be used to accommodate the electrode assembly 2, the electrolyte and other components. The shell 12 and the end cover 11 can be independent components, and an opening can be provided on the shell 12, and the end cover 11 is covered on the opening to form the internal environment of the battery monomer 20. Without limitation, the end cover 11 and the shell 12 can also be integrated, specifically, the end cover 11 and the shell 12 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the shell 12, the end cover 11 is covered on the shell 12. The shell 12 can be various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the shell 12 can be determined according to the specific shape and size of the electrode assembly 2. The material of the shell 12 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present disclosure do not have special restrictions thereon.

[0115] Exemplarily, the pole 3 is connected to the end cover 11 of the shell 1.

[0116] In some embodiments of the present disclosure, as shown in FIG. 5, the battery monomer 20 further comprises a fixing structure 5, and the pole 3 is fixed to the first wall through the fixing structure 5.

[0117] The fixing structure 5 is arranged, the fixed connection of the pole 3 and the first wall of the shell 1 is realized, so that the sealing ring 4 is more firmly clamped between the outer circumferential surface of the pole 3 and the inner wall of the pole mounting hole 111, the height space occupied by the sealing ring 4 is reduced, and the volume energy density of the battery monomer 20 can be improved.

[0118] In some embodiments of the present disclosure, as shown in FIGS. 7 and 8, one of the outer circumferential surface of the pole 3 and the inner circumferential surface of the fixing structure 5 is provided with a recess 311, and the other is provided with a protrusion 511, and the protrusion 511 is engaged in the recess 311.

[0119] For example, as shown in FIGS. 7 to 11, the outer circumferential surface of the pole 3 is provided with a recess 311, and the inner circumferential surface of the fixing structure 5 is provided with a protrusion 511, and the protrusion 511 is engaged in the recess 311.

[0120] For example, the outer circumferential surface of the pole 3 is provided with a protrusion 511, and the inner circumferential surface of the fixing structure 5 is provided with a recess 311, and the protrusion 511 is engaged in the recess 311.

[0121] In this way, through the engagement of the recess 311 and the protrusion 511, the connection strength of the pole 3 and the fixing structure 5 is improved, which is conducive to improving the connection strength of the pole 3 and the shell 1; at the same time, since the sealing ring 4 is clamped between the outer circumferential surface of the pole 3 and the inner wall of the pole mounting hole 111, the height space occupied by the sealing ring 4 is reduced, and the volume energy density of the battery monomer 20 can be improved.

[0122] In some embodiments of the present disclosure, the fixing structure 5 includes a first fixing structure 51 and a second fixing structure 52 connected to the outer surface and the inner surface of the first wall respectively, the first fixing structure 51 and the second fixing structure 52 are connected to the outer circumferential surface of the pole 3 respectively, and the first fixing structure 51 and the second fixing structure 52 are connected to the two ends of the sealing ring 4 along the axial direction of the pole 3 respectively.

[0123] In this way, the connection strength of the fixing structure 5 and the pole 3 is improved, which is conducive to improving the connection strength of the pole 3 and the shell 1; moreover, the first fixing structure 51 and the second fixing structure 52 fix the position of the sealing ring 4 in the axial direction of the pole 3, improve the firmness of the sealing ring 4, improve the sealing performance of the sealing ring 4 to the pole 3, thereby reducing the probability of electrolyte leakage, and further prolonging the service life of the battery monomer 20; at the same time, since the sealing ring 4 is clamped between the outer circumferential surface of the pole 3 and the inner wall of the pole mounting hole 111, the height space occupied by the sealing ring 4 is reduced, and the volume energy density of the battery monomer 20 can be improved.

[0124] In some embodiments of the present disclosure, the first fixing structure 51 and the second fixing structure 52 are both made of insulating material.

[0125] In this way, the fixing structure 5 not only fixes the pole 3, but also insulates the pole 3 and the shell 1, and realizes the normal function of the battery monomer 20.

[0126] In some embodiments of the present disclosure, the first fixing structure 51 and the second fixing structure 52 are both plastic parts, which are made by injection molding. In this way, the connection strength is improved, and the insulation effect is achieved.

[0127] In some embodiments of the present disclosure, the material of the plastic part includes at least one of polyphenylene sulfide, polypropylene, polyvinyl fluoride copolymer, and polybutylene terephthalate.

[0128] In some embodiments of the present disclosure, the inner circumferential surface of the first fixing structure 51 and the second fixing structure 52 is provided with at least one protrusion 511, and the outer circumferential surface of the pole 3 is provided with at least two recesses 311, and each protrusion 511 is correspondingly clamped in each recess 311.

[0129] For example, the inner circumferential surface of the first fixing structure 51 is provided with one protrusion 511, the inner circumferential surface of the second fixing structure 52 is provided with one protrusion 511, and the outer circumferential surface of the pole 3 is provided with two recesses 311, and each protrusion 511 is correspondingly clamped in each recess 311.

[0130] In this way, the connection strength of the first fixing structure 51 and the second fixing structure 52 with the pole 3 is improved, thereby improving the connection strength of the pole 3 and the shell 1. Moreover, since the sealing ring 4 is clamped between the outer circumferential surface of the pole 3 and the inner wall of the pole mounting hole 111, the occupation of the height space by the sealing ring 4 is reduced, and the volume energy density of the battery monomer 20 can be improved.

[0131] In some embodiments of the present disclosure, as shown in FIGS. 8 and 10, the outer surface of the first wall is provided with a clamping protrusion 112, and the first fixing structure 51 is provided with a clamping groove 512 which is clamped with the clamping protrusion 112.

[0132] In this way, the connection strength of the shell 1 and the first fixing structure 51 is improved, thereby improving the structural strength of the battery monomer 20. Moreover, since the sealing ring 4 is clamped between the outer circumferential surface of the pole 3 and the inner wall of the pole mounting hole 111, the occupation of the height space by the sealing ring 4 is reduced, and the volume energy density of the battery monomer 20 can be improved.

[0133] In some embodiments of the present disclosure, the pole 3 is provided with at least two poles 3, and the sealing ring 4 is clamped between each pole 3 and the inner wall of the pole mounting hole 111 in which the pole 3 is arranged, and the at least two poles 3 include a first pole 3a and a second pole 3b, the first pole 3a is connected to the negative electrode tab 21 of the electrode assembly 2, and the second pole 3b is connected to the positive electrode tab 22 of the electrode assembly 2. In some embodiments of the present disclosure, the pole 3 is provided with at least two poles 3, and the sealing ring 4 is clamped between each pole 3 and the inner wall of the pole mounting hole 111 in which the pole 3 is arranged, and the at least two poles 3 include a first pole 3a and a second pole 3b, the first pole 3a is connected to the negative electrode tab 21 of the electrode assembly 2, and the second pole 3b is connected to the positive electrode tab 22 of the electrode assembly 2.

[0134] The first pole 3a is connected to the negative electrode tab 21 of the electrode assembly 2, and the second pole 3b is connected to the positive electrode tab 22 of the electrode assembly 2, so that the first pole 3a serves as a negative electrode pole of the battery monomer 20, and the second pole 3b serves as a positive electrode pole of the battery monomer 20. The sealing rings 4 of the positive electrode pole and the negative electrode pole are both radially sealed, reducing the occupation of the sealing rings 4 on the height space, and the volume energy density of the battery monomer 20 can be improved.

[0135] In some embodiments of the present disclosure, the first pole 3a includes a first pole body 31 and a second pole body 32 connected to the first pole body 31, and an end of the second pole body 32 away from the first pole body 31 is connected to the negative electrode tab 21. The first pole body 31 and the second pole body 32 are made of different conductive materials, and the first pole body 31 is made of aluminum material.

[0136] The first pole 3a serves as a negative electrode pole of the battery monomer 20, and the second pole body 32 is interposed between the first pole body 31 and the accommodation cavity. The electrolyte in the accommodation cavity is not easy to contact the first pole body 31, so the first pole body 31 made of aluminum material is not easy to corrode the aluminum material due to the contact of the electrolyte and the aluminum material. Moreover, the aluminum material has a lower cost, so the material cost of the battery monomer 20 can be reduced. Furthermore, the end of the first pole body 31 close to the accommodation cavity is inserted into the groove of the second pole body 32, further reducing the probability of the electrolyte in the accommodation cavity contacting the first pole body 31, and further reducing the probability of the electrolyte corroding the aluminum material.

[0137] In some embodiments of the present disclosure, the second pole body 32 is made of copper material.

[0138] The copper material is not easy to have an oxidation reaction with the electrolyte, that is, the electrolyte is not easy to corrode the copper material. Therefore, the second pole body 32 close to the electrolyte is made of copper material, which can reduce the probability of the electrolyte corroding the first pole 3a, thereby being conducive to prolonging the service life of the battery monomer 20.

[0139] In some embodiments of the present disclosure, the second pole body 32 can be made of, but not limited to, zinc, lead, carbon or other materials.

[0140] In some embodiments of the present disclosure, the surface of the second pole body 32 away from the accommodation cavity is formed with a groove, and part of the first pole body 31 is inserted into the groove.

[0141] The recess of the second columnar portion 32 can be a cylindrical recess, a cubic recess, or other three-dimensional recess, as long as it can be partially inserted with the first columnar portion 31, and the shape of the recess of the second columnar portion 32 is not limited. The portion of the first columnar portion 31 inserted into the recess is adapted to the shape of the recess, so that at least part of the surface of the first columnar portion 31 is in contact with the inner wall of the recess, thereby realizing the electrical connection of the two. For example, the entire surface of the portion of the first columnar portion 31 inserted into the recess is in contact with the entire inner wall of the recess, so as to improve the connection strength of the first columnar portion 31 and the second columnar portion 32.

[0142] In the battery monomer 20 provided by the embodiments of the present disclosure, the portion of the first columnar portion 31 is partially inserted into the recess of the second columnar portion 32, which can increase the contact area between the first columnar portion 31 and the second columnar portion 32, thereby improving the connection strength of the two. Moreover, when an external force in a direction perpendicular to the insertion direction of the first columnar portion 31 and the second columnar portion 32 is applied, the portion of the first columnar portion 31 and the recess of the second columnar portion 32 form an engagement, so that the first pole column 3a is not easy to deform or break at the connection between the first columnar portion 31 and the second columnar portion 32, thereby improving the structural strength of the first pole column 3a, and further improving the structural strength of the battery monomer 20.

[0143] In some embodiments of the present disclosure, the connection mode of the first columnar portion 31 and the second columnar portion 32 includes friction welding.

[0144] The friction welding connection mode can firmly weld the portion of the first columnar portion 31 inserted into the recess of the second columnar portion 32 and the inner wall of the recess, thereby improving the firmness of the connection of the first columnar portion 31 and the second columnar portion 32, further improving the structural strength of the first pole column 3a, and thereby improving the structural strength of the battery monomer 20.

[0145] In some embodiments of the present disclosure, the recess does not penetrate to the surface of the second columnar portion 32 facing the accommodation cavity, and does not penetrate to the outer peripheral surface of the second columnar portion 32.

[0146] In this way, the second columnar portion 32 blocks between the accommodation cavity and the first columnar portion 31, thereby reducing the probability of the electrolyte contacting the first columnar portion 31, and thereby reducing the probability of the first columnar portion 31 being corroded, thereby facilitating the extension of the service life of the battery monomer 20.

[0147] In some embodiments of the present disclosure, the outer peripheral surface of the second columnar portion 32 is provided with at least one recess 311, and the recess 311 of the second columnar portion 32 does not penetrate to the inner wall of the recess.

[0148] In this way, the connection strength of the second columnar portion 32 and the fixing structure 5 is improved, and the recessed portion 311 does not penetrate the inner wall of the groove, so that the probability of the electrolyte entering the groove to contact the first columnar portion 31 is reduced, the probability of the first columnar portion 31 being corroded is reduced, and the service life of the battery monomer 20 is prolonged.

[0149] In some embodiments of the present disclosure, the fixing structure 5 includes a first fixing structure 51 and a second fixing structure 52, the first fixing structure 51 and the second fixing structure 52 are connected to the outer surface and the inner surface of the first wall respectively, the outer peripheral surface of the first columnar portion 31 is connected to the inner peripheral surface of the first fixing structure 51, and the outer peripheral surface of the second columnar portion 32 is connected to the inner peripheral surface of the second fixing structure 52.

[0150] The inner peripheral surface of the first fixing structure 51 can be connected only to the outer peripheral surface of the first columnar portion 31 and not to the outer peripheral surface of the second columnar portion 32, or the inner peripheral surface of the first fixing structure 51 can be connected to both the outer peripheral surface of the first columnar portion 31 and the outer peripheral surface of the second columnar portion 32. Correspondingly, the inner peripheral surface of the second fixing structure 52 can be connected only to the outer peripheral surface of the second columnar portion 32 and not to the outer peripheral surface of the first columnar portion 31, or the inner peripheral surface of the second fixing structure 52 can be connected to both the outer peripheral surface of the second columnar portion 32 and the outer peripheral surface of the first columnar portion 31.

[0151] For example, as shown in FIG. 8, the inner peripheral surface of the first fixing structure 51 is connected to both the outer peripheral surface of the first columnar portion 31 and the outer peripheral surface of the second columnar portion 32, and the inner peripheral surface of the second fixing structure 52 is connected only to the outer peripheral surface of the second columnar portion 32 and not to the outer peripheral surface of the first columnar portion 31.

[0152] In this way, the first columnar portion 31 is connected to the outer surface of the first wall through the first fixing structure 51, and the second columnar portion 32 is connected to the inner surface of the first wall through the second fixing structure 52, further improving the connection strength of the pole 3 and the first wall, thereby improving the structural strength of the battery monomer 20.

[0153] In some embodiments of the present disclosure, the outer peripheral surfaces of the first columnar portion 31 and the second columnar portion 32 are each provided with a recessed portion 311, the inner peripheral surfaces of the first fixing structure 51 and the second fixing structure 52 are each provided with a protruding portion 511, the recessed portion 311 of the first columnar portion 31 is engaged with the protruding portion 511 of the first fixing structure 51, and the recessed portion 311 of the second columnar portion 32 is engaged with the protruding portion 511 of the second fixing structure 52. In this way, the connection strength of the pole 3 and the fixing structure 5 is further improved.

[0154] In some embodiments of the present disclosure, as shown in FIG. 10, the first fixing structure 51 is provided with a protruding portion 511, as shown in FIG. 8, the outer circumferential surface of the first columnar portion 31 is provided with a first recessed structure near the edge of the second columnar portion 32, the outer circumferential surface of the second columnar portion 32 is provided with a second recessed structure near the edge of the first columnar portion 31, the first recessed structure and the second recessed structure are combined to form a recessed portion 311, the recessed portion 311 is clamped with the protruding portion 511 of the first fixing structure 51, in this way, the protruding portion 511 of the first fixing structure 51 is clamped with the first columnar portion 31 and the second columnar portion 32 at the same time, thereby improving the connection strength.

[0155] In some embodiments of the present disclosure, the minimum distance between the surface of the second columnar portion 32 facing the accommodation cavity and the inner wall of the groove opposite the accommodation cavity is not less than 1 mm.

[0156] As shown in FIG. 7, the surface of the second columnar portion 32 facing the accommodation cavity is F1, the inner wall of the groove opposite the accommodation cavity is F2, the minimum distance between the surface F1 and the inner wall F2 is L, and L≥1 mm.

[0157] For example, the minimum distance L between the surface of the second columnar portion 32 facing the accommodation cavity and the inner wall of the groove opposite the accommodation cavity is equal to 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm, etc.

[0158] In this way, the part of the second columnar portion 32 blocking between the first columnar portion 31 and the accommodation cavity is relatively thick, which reduces the probability of penetrating this part when the second columnar portion 32 is welded with the first columnar portion 31, thereby reducing the probability of corrosion of the first columnar portion 31, thereby facilitating the extension of the service life of the battery monomer 20.

[0159] In some embodiments of the present disclosure, as shown in FIG. 8, the first columnar portion 31 includes a base portion 312 and an insertion portion 313 connected to one end of the base portion 312 facing the accommodation cavity, the insertion portion 313 is inserted into the groove, the outer circumferential edge of the base portion 312 exceeds the insertion portion 313 and forms a flange surface facing the accommodation cavity at the connection between the two, the flange surface and the end surface of the one end of the second columnar portion 32 facing away from the accommodation cavity combine to form a first interface 314, the surface of the sealing ring 4 facing away from the accommodation cavity and the first fixing structure 51 combine to form a second interface 41, and the first interface 314 is staggered to the second interface 41 on the side away from the accommodation cavity.

[0160] The "end surface of the one end of the second columnar portion 32 facing away from the accommodation cavity" refers to the surface of the second columnar portion 32 facing away from the accommodation cavity, except for the inner wall of the groove, which is also the surface of the second columnar portion 32 facing away from the accommodation cavity and surrounding the outer circumference of the groove.

[0161] The formation of the first interface 314 further increases the contact area between the first columnar portion 31 and the second columnar portion 32, thereby further improving the structural strength of the pole column 3, and further improving the structural strength of the battery monomer 20. The first interface 314 is offset to the side away from the accommodation cavity relative to the second interface 41, so that the sealing ring 4 is in contact with the second columnar portion 32 and not in contact with the first columnar portion 31, so that the electrolyte is less likely to contact the first columnar portion 31, further prolonging the service life of the battery monomer 20.

[0162] In some embodiments of the present disclosure, the second pole column 3b is made of aluminum material.

[0163] The second pole column 3b is a positive pole column, and the aluminum material is less likely to cause oxidation reaction with the electrolyte and is less likely to cause corrosion to the aluminum material. In addition, the cost of the aluminum material is low, so that the material cost of the battery monomer 20 can be reduced, and the service life of the battery monomer 20 will not be affected.

[0164] In some embodiments of the present disclosure, the structure of the second pole column 3b is similar to that of the first pole column 3a, and the at least two parts are connected by the concave-convex matching mode. For specific structures, reference can be made to the foregoing description of the structure of the first pole column 3a, which will not be described here.

[0165] In some embodiments of the present disclosure, as shown in FIG. 9, the second pole column 3b is provided in an integral forming structure.

[0166] For example, the second pole column 3b is provided in an integral forming structure, which improves the structural strength of the second pole column 3b and further improves the structural strength of the battery monomer 20, thereby prolonging the service life of the battery monomer 20.

[0167] In some embodiments of the present disclosure, as shown in FIG. 4, the negative pole lug 21 and the positive pole lug 22 of the electrode assembly 2 are located at the same end of the main body portion, and a bottom supporting plate 6 is arranged between the side of the main body portion facing away from the negative pole lug 21 and the positive pole lug 22 and the shell 12; a blue film 9 is attached to the outer surface of the shell 12; an insulating sheet 7 is attached to the inner wall of the shell 12, and the insulating sheet 7 is used to insulate the electrode assembly 2 and the shell 12; and a top cover patch 8 is attached to the outer surface of the end cover 11.

[0168] The second aspect of the present disclosure provides a battery 100, which comprises at least one battery monomer 20 provided by the first aspect.

[0169] Since the battery 100 comprises the battery monomer 20 provided by the first aspect, the battery 100 comprises all the beneficial effects of the battery monomer 20, so that the volumetric energy density of the battery 100 is improved.

[0170] The third aspect of the present disclosure provides an energy storage device, the energy storage device comprising the battery cell 20 provided by the first aspect or the battery 100 provided by the second aspect.

[0171] The battery cell 20 provided by the first aspect or the battery 100 provided by the second aspect has a high volumetric energy density, so that the space occupation in the energy storage device can be reduced or a higher total energy can be stored in a limited space.

[0172] The fourth aspect of the present disclosure provides a power consumption device, the power consumption device comprising the battery cell 20 provided by the first aspect or the battery 100 provided by the second aspect for providing electric energy.

[0173] The battery cell 20 provided by the first aspect or the battery 100 provided by the second aspect has a high volumetric energy density, so that the space occupation in the power consumption device can be reduced or a higher total energy can be provided in a limited space.

[0174] FIG. 12 is a flowchart of a manufacturing method of a battery cell according to some embodiments of the present disclosure.

[0175] The fifth aspect of the present disclosure provides a manufacturing method of a battery cell, comprising:

[0176] S1, providing a housing, an electrode assembly, a pole and a sealing ring, a first wall of the housing is provided with a pole mounting hole;

[0177] S2, sleeving the sealing ring on the outer peripheral side of the pole to obtain a first structure;

[0178] S3, sleeving the first wall on the outer peripheral side of the sealing ring through the pole mounting hole to obtain a second structure;

[0179] In the second structure, the sealing ring 4 is clamped between the outer peripheral surface of the pole 3 and the inner wall of the pole mounting hole 111.

[0180] In the battery cell 20 manufactured by the manufacturing method of the battery cell provided by the embodiments of the present disclosure, at least part of the sealing ring 4 is clamped between the outer peripheral surface of the pole 3 and the inner wall of the pole mounting hole 111, which can reduce the space occupation of the sealing ring 4 in the height direction, and can improve the volumetric energy density of the battery cell 20.

[0181] In some embodiments of the present disclosure, after obtaining the second structure, the method further comprises:

[0182] S4, injection molding the second structure to form a fixing structure connecting the pole and the first wall.

[0183] The fixing structure 5 formed by injection molding makes the pole 3 fixedly connected with the first wall of the shell 1, so that the sealing ring 4 is clamped more firmly between the outer circumferential surface of the pole 3 and the inner wall of the pole mounting hole 111, the occupation of the height space by the sealing ring 4 is reduced, and the volume energy density of the battery monomer 20 can be improved.

[0184] In the following, specific examples of some embodiments of the present disclosure are described in conjunction with the drawings.

[0185] As a specific example, a battery monomer 20 is provided, a sealing structure (sealing ring 4) of the battery monomer 20 is clamped from both sides by the pole (pole 3) and the inner wall of the pole mounting hole (pole mounting hole 111) in the radial direction of the pole, realizing radial compression to realize the sealing function. The negative pole (first pole 3a) in the pole includes a first part (first pole part 31) made of aluminum material and a second part (second pole part 32) made of copper material, the surface of the second part facing away from the accommodation cavity of the battery monomer 20 is provided with a groove, part of the first part is inserted into the groove, the part of the first part inserted into the groove and the inner bottom wall of the groove combine to form a first composite interface, the part of the first part inserted into the groove and the inner side wall of the groove combine to form a second composite interface, and the part of the first part not inserted into the groove and the surface of the second part facing away from the accommodation cavity of the battery monomer 20 combine to form a third composite interface (first interface 314). The first part and the second part form three composite interfaces of the first composite interface, the second composite interface and the third composite interface, increase the interface size of the two parts, increase the contact area, and improve the connection strength. The negative pole uses a copper-aluminum composite pole, the second part close to the electrolyte uses copper, and the first part away from the electrolyte uses aluminum, the second part plays a blocking role, which can reduce the corrosion of the electrolyte to aluminum. The positive pole (second pole 3b) uses all-aluminum, which will not be corroded, and reduces the cost.

[0186] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure 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 present disclosure, and they should be covered in the scope of the specification of the present disclosure. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, comprising: A housing having a receiving cavity, wherein a first wall of the housing is provided with a pole mounting hole; an electrode assembly, the electrode assembly being accommodated in the accommodating cavity; a pole, at least a portion of which is inserted into the pole mounting hole and connected to the electrode assembly; A sealing ring is at least partially clamped between the outer peripheral surface of the pole and the inner wall of the pole mounting hole.

2. The battery cell according to claim 1, wherein: The battery cell further includes a fixing structure, and the pole is fixed to the first wall through the fixing structure.

3. The battery cell according to claim 2, wherein: One of the outer circumferential surface of the pole and the inner circumferential surface of the fixing structure is provided with a recessed portion, and the other is provided with a protruding portion, and the protruding portion is engaged with the recessed portion.

4. The battery cell according to claim 3, wherein: The fixing structure includes a first fixing structure and a second fixing structure respectively connected to the outer surface and the inner surface of the first wall, the first fixing structure and the second fixing structure are respectively connected to the outer peripheral surface of the pole, and the first fixing structure and the second fixing structure are respectively connected to the two ends of the sealing ring along the axial direction of the pole.

5. The battery cell according to claim 4, wherein: The first fixing structure and the second fixing structure are both made of insulating materials.

6. The battery cell according to claim 4 or 5, wherein: The inner circumferences of the first fixing structure and the second fixing structure are each provided with at least one protrusion, and the outer circumference of the pole is provided with at least two recesses, and each protrusion is engaged with each recess in a one-to-one correspondence.

7. The battery cell according to any one of claims 4 to 6, wherein: An engaging protrusion is provided on the outer surface of the first wall, and the first fixing structure is provided with a engaging groove engaged with the engaging protrusion.

8. The battery cell according to any one of claims 4 to 7, wherein: There are at least two poles, and the sealing ring is clamped between each pole and the inner wall of the pole mounting hole through which the pole is passed. The at least two poles include a first pole and a second pole, the first pole is connected to the negative pole tab of the electrode assembly, and the second pole is connected to the positive pole tab of the electrode assembly.

9. The battery cell according to claim 8, wherein: The first pole includes a first column portion and a second column portion connected to the first column portion, and an end of the second column portion facing away from the first column portion is connected to the negative electrode tab. The first column portion and the second column portion are made of different conductive materials, and the first column portion is made of aluminum.

10. The battery cell according to claim 9, wherein: The second column portion is made of copper.

11. The battery cell according to claim 9 or 10, wherein: A groove is formed on a surface of the second column portion facing away from the accommodating cavity, and a portion of the first column portion is inserted into the groove.

12. The battery cell according to claim 11, wherein: The groove does not penetrate to the surface of the second column portion facing the accommodating cavity, and does not penetrate to the outer peripheral surface of the second column portion.

13. The battery cell according to claim 11 or 12, wherein: At least one recessed portion is provided on the outer circumferential surface of the second column portion, and the recessed portion provided on the second column portion does not penetrate through the inner wall of the groove.

14. The battery cell according to any one of claims 11 to 13, wherein: A minimum distance between a surface of the second column portion facing the accommodating cavity and an inner wall of the groove opposite to the accommodating cavity is not less than 1 mm.

15. The battery cell according to any one of claims 11 to 14, wherein: The first column portion includes a base portion and an insertion portion connected to the base portion at one end facing the accommodating cavity, the insertion portion is inserted into the groove, the outer peripheral edge of the base portion extends beyond the insertion portion and forms a flange surface facing the accommodating cavity at the connection between the two, the flange surface is combined with the end surface of the second column portion at one end facing away from the accommodating cavity to form a first interface, the surface of the sealing ring facing away from the accommodating cavity is combined with the first fixed structure to form a second interface, and the first interface is offset from the second interface toward the side away from the accommodating cavity.

16. A battery comprising: At least one battery cell according to any one of claims 1 to 15. 17 . An energy storage device, comprising the battery cell according to claim 1 or the battery according to claim 16 .

18. An electrical device comprising the battery cell according to any one of claims 1 to 15 or the battery according to claim 16 for providing electrical energy.

19. A method for manufacturing a battery cell, comprising: Providing a housing, an electrode assembly, a pole and a sealing ring, wherein a first wall of the housing is provided with a pole mounting hole; Putting the sealing ring on the outer circumference of the pole to obtain a first structure; The first wall is inserted into the outer circumference of the sealing ring through the pole mounting hole to obtain a second structure; Wherein, the sealing ring in the second structure is clamped between the outer peripheral surface of the pole and the inner wall of the pole mounting hole.

20. The method for manufacturing a battery cell according to claim 19, wherein: After obtaining the second structure, it also includes: The second structure is injection molded to form a fixed structure connecting the pole and the first wall.

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