Pole component, cover assembly, and battery cell

Abstract

A pole component, a cover assembly, and a battery cell, pertaining to the technical field of batteries. The pole component (101) comprises a first pole (1) and a second pole (2). A liquid injection hole (11) is formed on the first pole (1). The second pole (2) is connected to the first pole (1) to block the liquid injection hole (11). The pole component (101) is not a whole part, but is divided into the first pole (1) and the second pole (2). The first pole (1) is provided with the liquid injection hole (11), and an electrolyte can be injected by means of the liquid injection hole (11) into a cell located in a containing cavity defined by a shell and a cover assembly (100). After liquid injection is complete, the second pole (2) is connected to the first pole (1). Thus, by using the second pole (2) to block the liquid injection hole (11), it is not necessary to dispose an additional sealing pin for blocking the liquid injection hole (11), and the step of welding a sealing pin so as to block the liquid injection hole (11) is omitted. The pole component (101) has the function of conduction, and, by means of the liquid injection hole (11) of the first pole (1), the pole component (101) also has the function of liquid injection. In addition, by using the second pole (2) to block the liquid injection hole (11), the pole component (101) also has the function of a sealing pin.

Description

A pole assembly, a cover assembly and a battery cell

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on the Chinese patent application with application number 202322846435.5, application date October 23, 2023, and invention name “A pole assembly, cover assembly and battery cell”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to a pole assembly, a cover assembly, and a battery cell. Background Art

[0004] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in energy storage fields.

[0005] In the related art, the function of the pole assembly is relatively simple.

[0006] Utility Model Content

[0007] In order to solve the above technical problems, the present disclosure provides a pole assembly, a cover assembly and a battery cell, so that the pole assembly has at least two functions.

[0008] The present disclosure is achieved through the following technical solutions.

[0009] A first aspect of an embodiment of the present disclosure provides a pole assembly, comprising:

[0010] The first pole is formed with a liquid injection hole;

[0011] The second pole is connected to the first pole to block the liquid injection hole.

[0012] In the disclosed embodiment, the electrode assembly not only performs the function of conducting electricity, but also functions as a liquid injection device through the injection hole of the first electrode. By blocking the injection hole with the second electrode, the electrode assembly also functions as a sealing nail. Therefore, the disclosed electrode assembly has at least two functions, enriching the functionality of the electrode assembly and effectively solving the problem of the electrode assembly having a single function.

[0013] In one embodiment, the second pole has a mounting portion, and the first pole includes:

[0014] a substrate, wherein the injection hole is formed on the substrate;

[0015] A convex ring is connected to one side of the substrate, the convex ring and the substrate form a mounting cavity, the mounting cavity is connected to the injection hole, the injection hole is located on the side of the convex ring facing the mounting cavity, the second pole is connected to the convex ring, and the mounting portion is located in the mounting cavity to block the injection hole.

[0016] In the embodiment of the present disclosure, the mounting portion is located in the mounting cavity to block the liquid injection hole. By at least partially sinking the second pole into the mounting cavity, the volume energy density of the battery cell can be improved and the processing difficulty of the liquid injection hole can be reduced.

[0017] In one embodiment, the mounting portion is connected to the protruding ring so that the first pole and the second pole are pressed against each other.

[0018] In the embodiment of the present disclosure, the first pole and the second pole are squeezed against each other, so that the first pole and the second pole are in close contact, which is beneficial to enhancing the current flow capacity between the first pole and the second pole.

[0019] In one embodiment, an internal thread is formed on the side of the convex ring facing the mounting cavity, and an external thread is formed on the mounting portion, and the external thread and the internal thread are threadedly connected so that the first pole and the second pole are squeezed against each other; or, the mounting portion and the convex ring are riveted so that the first pole and the second pole are squeezed against each other.

[0020] In the embodiment of the present disclosure, a threaded connection is achieved by screwing together an internal thread and an external thread, so that the first pole and the second pole can be pressed against each other roughly along the axial direction of the injection hole, thereby enhancing the flow capacity between the first pole and the second pole. Furthermore, the internal thread and the external thread are screwed together, so that the threads of the internal thread and the threads of the external thread bite each other, increasing the contact area between the first pole and the second pole, which is beneficial to enhancing the flow capacity between the first pole and the second pole. The threaded connection between the first pole and the second pole allows the first pole and the second pole to be assembled in a manner that is not contaminated by the electrolyte in the injection hole. The first pole and the second pole connected by rivets can still maintain a pressed state of squeezing each other even in a vibration environment.

[0021] In one embodiment, the second pole includes:

[0022] a pole body, the mounting portion being formed on the pole body;

[0023] A flange is connected to the pole body, surrounds the pole body, and is welded to an end of the convex ring facing away from the base plate.

[0024] In the disclosed embodiment, the flange is welded to the end of the convex ring facing away from the substrate, so that the axial dimension of the flange along the injection hole is smaller than the axial dimension of the pole body along the injection hole, which is conducive to the welding gun welding the flange and the convex ring from the side of the flange facing away from the convex ring, thereby improving the flow capacity of the flange and the convex ring.

[0025] In one embodiment, the mounting portion is in contact with the substrate, and / or a surface of the convex ring facing the mounting cavity is in contact with the mounting portion.

[0026] In the embodiment of the present disclosure, the fitting of the mounting portion with the substrate and / or the convex ring is conducive to increasing the contact area between the second pole and the first pole, thereby improving the current flow capacity between the first pole and the second pole.

[0027] In one embodiment, a surface of the second pole facing away from the substrate is flush with a surface of the convex ring facing away from the substrate.

[0028] In the embodiment of the present disclosure, the corresponding surfaces of the second pole and the convex ring are flush, and the second pole does not protrude from the side of the convex ring away from the substrate, which is beneficial to reducing the overall size of the pole assembly along the axial direction of the injection hole and improving the volume energy density of the battery cell.

[0029] In one embodiment, an axial dimension of the liquid injection hole is smaller than an axial dimension of the second pole along the liquid injection hole.

[0030] In the disclosed embodiment, the injection hole has a relatively small axial dimension, which reduces the difficulty of creating the injection hole on the first pole. The second pole has a relatively large axial dimension along the injection hole, which helps to strengthen the second pole that blocks the injection hole, reduces the possibility of damage to the second pole from external influences, and enables the second pole to more tightly block the injection hole.

[0031] In one embodiment, the second pole covers the outside of the liquid injection hole, and along the axial projection of the liquid injection hole, the projection area of ​​the liquid injection hole is located within the projection area of ​​the second pole.

[0032] In the embodiment of the present disclosure, the projection area of ​​the liquid injection hole is located within the projection area of ​​the second pole, and the liquid injection hole is completely covered by the second pole, which is conducive to the second pole better sealing the liquid injection hole. The second pole is outside the liquid injection hole, and the second pole does not need to be installed in the liquid injection hole. After the liquid injection is completed, a sealant can be injected into the liquid injection hole to complete the pre-sealing of the liquid injection hole, and then the second pole can be installed to the first pole so that the second pole covers the outside of the liquid injection hole to achieve the sealing of the liquid injection hole. Since the liquid injection hole can be pre-sealed, the contamination of the second pole by the electrolyte can be reduced during the process of installing the second pole to the first pole.

[0033] A second aspect of the present disclosure provides a cover assembly, comprising:

[0034] A main cover having a through hole, wherein the through hole passes through the main cover;

[0035] Any of the above-mentioned pole assemblies, wherein the pole assembly is provided through the corresponding through hole;

[0036] An insulating assembly is provided between the main cover and the pole assembly to prevent conduction between the main cover and the pole assembly.

[0037] In the disclosed embodiment, the electrode assembly not only performs the function of conducting electricity, but also functions as a liquid injection device through the injection hole of the first electrode. By blocking the injection hole with the second electrode, the electrode assembly also functions as a sealing nail. Therefore, the disclosed electrode assembly has at least two functions, enriching the functionality of the electrode assembly and effectively solving the problem of the electrode assembly having a single function.

[0038] A third aspect of the present disclosure provides a battery cell, including:

[0039] shell;

[0040] Any of the above-mentioned cover assemblies is configured with the housing to form a receiving cavity;

[0041] The battery cell is located in the accommodating cavity, and the battery cell has a tab, which is electrically connected to the pole assembly.

[0042] In the disclosed embodiment, the electrode assembly not only performs the function of conducting electricity, but also functions as a liquid injection device through the injection hole of the first electrode. By blocking the injection hole with the second electrode, the electrode assembly also functions as a sealing nail. Therefore, the disclosed electrode assembly has at least two functions, enriching the functionality of the electrode assembly and effectively solving the problem of the electrode assembly having a single function.

[0043] Utility model effect:

[0044] The pole assembly of the embodiment of the present disclosure is no longer a whole, but is divided into two parts, a first pole and a second pole. There is a liquid injection hole on the first pole, through which electrolyte can be injected into the battery cell located in the accommodating cavity surrounded by the shell and the cover assembly. After the liquid injection is completed, the second pole is connected to the first pole, and the liquid injection hole is sealed by the second pole. There is no need to set an additional sealing nail to seal the liquid injection hole, and the step of welding the sealing nail to seal the liquid injection hole is omitted. The pole assembly not only has the function of conducting electricity, but also has the function of injecting liquid through the liquid injection hole of the first pole, and has the function of a sealing nail by blocking the liquid injection hole through the second pole. Therefore, the pole assembly of the present disclosure has at least two functions, which makes the pole assembly more functional and better solves the problem of the single function of the pole assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0046] FIG1 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure;

[0047] FIG2 is a schematic structural diagram of a cover assembly according to an embodiment of the present disclosure, wherein the second pole shown in the figure includes a flange located outside the mounting cavity;

[0048] FIG3 is a cross-sectional view at position AA in FIG2 ;

[0049] FIG4 is an exploded view of the cover assembly according to an embodiment of the present disclosure;

[0050] FIG5 is a cross-sectional view at position BB in FIG4 ;

[0051] FIG6 is a perspective view of a cover assembly according to an embodiment of the present disclosure;

[0052] FIG7 is a schematic structural diagram of the cover assembly according to an embodiment of the present disclosure, in which the first surface and the second surface are flush.

[0053] Explanation of the accompanying drawings: 1. First pole; 11. Liquid injection hole; 12. Base plate; 13. Convex ring; 131. Internal thread; 132. Second surface; 14. Mounting cavity; 2. Second pole; 21. Mounting portion; 211. External thread; 22. Pole body; 23. Flange; 24. First surface; 100. Cover assembly; 101. Pole assembly; 102. Main cover; 112. Through hole; 103. Insulation assembly; 113. First insulating ring; 123. Sealing insulating ring; 133. Second insulating ring; 200. Housing. DETAILED DESCRIPTION

[0054] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this disclosure; the terms "including" and "having" of the embodiments of this disclosure and any variations thereof are intended to cover non-exclusive inclusions.

[0056] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0057] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0059] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0060] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0061] As part of the creative concept of the present disclosure, before describing the embodiments of the present disclosure, it is necessary to analyze the reasons why the pole assembly of the battery cell has a single function in the related art, and obtain the technical solution of the embodiments of the present disclosure through reasonable analysis.

[0062] In related technologies, the battery cell's terminal assembly is electrically connected to the cell's tab. The battery cell discharges electricity through the tab and the terminal assembly, and an external power source can charge the battery cell through the terminal assembly and the tab. The terminal assembly is primarily used for electrical conduction and has a relatively simple function.

[0063] The battery cell's injection hole is usually located in the main cover. After injection, a sealing nail is welded to the main cover to seal the injection hole. The electrode is divided into two parts, one of which has an injection hole. This allows the electrode assembly to not only conduct electricity but also inject electrolyte through the injection hole provided on the electrode. After injection, the injection hole is sealed with the other part of the electrode. The electrode itself also functions as a sealing nail, thus giving the electrode assembly at least two functions, avoiding a single function.

[0064] The solutions of the disclosed embodiments can be applied, but are not limited to, to pole assemblies, cap assemblies, battery cells, battery modules, battery packs, energy storage devices, and electrical devices. By providing a liquid injection hole on the pole of the pole assembly and injecting liquid through the pole seal, the pole assembly has at least two functions, enriching its functionality and effectively solving the problem of the pole assembly having a single function.

[0065] An electrical device is a device that uses electricity as an energy source and consumes it to achieve its corresponding function. For example, an electrical device may include, but is not limited to, a mobile phone, tablet computer, laptop computer, electric toy, power tool, battery-powered vehicle, electric vehicle, ship, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0066] The electric device of the embodiment of the present disclosure may include a device body and a power supply device, the power supply device is used to supply power to the device body, and the power supply device may include a battery cell or a battery pack.

[0067] The "device body" refers to the main structure that consumes electrical energy to perform its corresponding functions. For example, a power-consuming device could be a mobile phone, where the "device body" is the portion that performs functions such as communication, and power is supplied to this portion via a battery cell or battery pack. For example, a power-consuming device could be a car, where the "device body" is the portion that provides passengers with a seat and allows them to travel on the road, and power is supplied to this portion via a battery cell or battery pack.

[0068] A power supply device is a device that can output electrical energy. For example, the electrical energy can be output by a battery pack composed of battery cells.

[0069] The electric device according to an embodiment of the present disclosure is described as a vehicle as an example.

[0070] The vehicle provided in one embodiment of the present disclosure may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery pack is provided inside the vehicle, and the battery pack may be provided at the bottom, head or tail of the vehicle. The battery pack may be used to power the vehicle. For example, the battery pack may serve as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller may be used to control the battery pack to power the motor. For example, the battery pack may be used for starting, navigating and operating power requirements of the vehicle during driving.

[0071] In some embodiments of the present disclosure, the battery pack can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0072] The battery pack according to the embodiment of the present disclosure includes a battery cell.

[0073] For example, a battery pack can be directly combined by combining multiple battery cells.

[0074] For example, multiple battery cells can be combined into a battery module, and then multiple battery modules can be combined into a battery pack.

[0075] There can be multiple battery cells, and these cells can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of both series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid configuration to form a battery pack. Of course, multiple battery cells can first be connected in series, in parallel, or in a hybrid configuration to form a battery module, which can then be connected in series, in parallel, or in a hybrid configuration to form a battery pack. A battery pack may also include other structures, such as a busbar assembly for electrically connecting multiple battery cells.

[0076] A battery cell is a unit that can convert chemical energy into electrical energy.

[0077] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0078] In the embodiments of the present disclosure, the battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., but the embodiments of the present disclosure are not limited to this.

[0079] Referring to FIG1 , the battery cell of the embodiment of the present disclosure includes a housing 200 , a cover assembly 100 , and a battery cell. The cover assembly 100 and the housing 200 enclose a receiving cavity. The battery cell is located in the receiving cavity.

[0080] Illustratively, the battery cell may be a wound battery cell or a laminated battery cell.

[0081] Exemplarily, the battery cell includes a positive electrode sheet, a negative electrode sheet, and a separator, and the separator is arranged between the positive electrode sheet and the negative electrode sheet.

[0082] In the embodiment of the present disclosure, the battery cell located in the accommodation cavity is protected by the housing 200 and the cover assembly 100 .

[0083] Referring to Figures 2 to 6 , the cover assembly 100 of the present embodiment includes a main cover 102, a pole assembly 101, and an insulating assembly 103. The main cover 102 has through-holes 112 extending therethrough. The pole assembly 101 is positioned in a corresponding through-hole 112. The insulating assembly 103 is disposed between the main cover 102 and the pole assembly 101 to prevent electrical conduction between the main cover 102 and the pole assembly 101.

[0084] Exemplarily, the battery cell has a tab, which is electrically connected to the pole assembly 101 .

[0085] Illustratively, the tab may be a positive tab or a negative tab, the positive tab corresponds to the positive electrode sheet, and the negative tab corresponds to the negative electrode sheet.

[0086] Exemplarily, the polarity of the electrode assembly 101 may be positive or negative. The polarity of the electrode assembly 101 electrically connected to the positive electrode tab is positive, and the polarity of the electrode assembly 101 electrically connected to the negative electrode tab is negative.

[0087] For example, referring to Figures 2 to 6 , the insulation assembly 103 includes a first insulating ring 113, a sealing insulating ring 123, and a second insulating ring 133, which are connected in sequence. The first insulating ring 113, the sealing insulating ring 123, and the second insulating ring 133 are located between the main cover 102 and the pole assembly 101. The first insulating ring 113 is located at the end of the sealing insulating ring 123 that faces away from the base plate 12 along the axial direction of the liquid injection hole 11, and the second insulating ring 133 is located at the end of the sealing insulating ring 123 that faces toward the base plate 12 along the axial direction of the liquid injection hole 11.

[0088] Exemplarily, the first insulating ring 113 and the second insulating ring 133 are both made of plastic.

[0089] In the embodiment of the present disclosure, the battery cell can release electrical energy to the outside through the electrode tab and the corresponding electrode column assembly 101, and the external power supply can charge the battery cell through the electrode column assembly 101 and the electrode tab.

[0090] 3 to 5 , the pole assembly 101 of the embodiment of the present disclosure includes a first pole 1 and a second pole 2. The first pole 1 is formed with a liquid injection hole 11. The second pole 2 is connected to the first pole 1 to block the liquid injection hole 11.

[0091] The injection hole 11 is used to inject electrolyte into the battery cell in the accommodating cavity.

[0092] Both the first pole 1 and the second pole 2 are capable of conducting electricity.

[0093] The first pole 1 is connected to the second pole 2 , and charged particles can flow from the first pole 1 to the second pole 2 or from the second pole 2 to the first pole 1 .

[0094] Exemplarily, the second pole 2 and the first pole 1 are welded.

[0095] For example, the second pole 2 and the first pole 1 may be connected in other detachable or non-detachable manners other than welding.

[0096] For example, the second pole 2 and the first pole 1 may be connected in a variety of ways.

[0097] In the embodiment of the present disclosure, the pole assembly 101 is no longer a whole, but is divided into two parts, a first pole 1 and a second pole 2. The first pole 1 has an injection hole 11, through which the electrolyte can be injected into the battery cell located in the accommodating cavity surrounded by the shell and the cover assembly 100. After the injection is completed, the second pole 2 is connected to the first pole 1, and the injection hole 11 is blocked by the second pole 2. There is no need to set an additional sealing nail to block the injection hole 11, and the step of welding the sealing nail to block the injection hole 11 is omitted. The pole assembly 101 not only has the function of conducting electricity, but also has the function of injecting liquid through the injection hole 11 of the first pole 1, and the function of a sealing nail by blocking the injection hole 11 through the second pole 2. Therefore, the pole assembly 101 of the present disclosure has at least two functions, which makes the pole assembly 101 more functional, and better solves the problem of the single function of the pole assembly 101.

[0098] In one embodiment, referring to FIG. 3 , the second pole 2 covers the outside of the injection hole 11 . Projected along the axial direction of the injection hole 11 , the projection area of ​​the injection hole 11 is within the projection area of ​​the second pole 2 .

[0099] In the disclosed embodiment, the projection area of ​​the liquid injection hole 11 is located within the projection area of ​​the second pole 2, and the liquid injection hole 11 is completely covered by the second pole 2, which is conducive to the second pole 2 to better seal the liquid injection hole 11. The second pole 2 is outside the liquid injection hole 11, and the second pole 2 does not need to be installed inside the liquid injection hole 11. After the liquid injection is completed, a sealant can be injected into the liquid injection hole 11 to complete the pre-sealing of the liquid injection hole 11, and then the second pole 2 can be installed to the first pole 1 so that the second pole 2 covers the outside of the liquid injection hole 11 to achieve the sealing of the liquid injection hole 11. Since the liquid injection hole 11 can be pre-sealed, the contamination of the second pole 2 by the electrolyte can be reduced during the process of installing the second pole 2 to the first pole 1.

[0100] In one embodiment, referring to FIG. 3 and FIG. 5 , the axial dimension of the liquid injection hole 11 is smaller than the axial dimension of the second pole 2 along the liquid injection hole 11 .

[0101] For example, referring to FIG5 , the axial dimension of the injection hole 11 is D1, the axial dimension of the second pole 2 along the injection hole 11 is D2, and D1 <D2。

[0102] For example, before the second pole 2 is mounted on the first pole 1 , the axial dimension of the liquid injection hole 11 may be measured using a tape measure or a vernier caliper.

[0103] For example, before the second pole 2 is mounted on the first pole 1 , the dimension of the second pole 2 along the axial direction of the liquid injection hole 11 may be measured using a tape measure or a vernier caliper.

[0104] In the disclosed embodiment, the axial dimension of the injection hole 11 is relatively small, which can reduce the difficulty of opening the injection hole 11 on the first pole 1. The axial dimension of the second pole 2 along the injection hole 11 is relatively large, which helps to enhance the strength of the second pole 2 blocking the injection hole 11, reduce the possibility of damage to the second pole 2 due to external influences, and enable the second pole 2 to block the injection hole 11 more tightly.

[0105] In one embodiment, referring to Figures 3 and 5 , the second pole 2 has a mounting portion 21. The first pole 1 includes a base plate 12 and a protruding ring 13. A liquid injection hole 11 is formed in the base plate 12. The protruding ring 13 is connected to one side of the base plate 12. The protruding ring 13 and the base plate 12 enclose a mounting cavity 14, which is connected to the liquid injection hole 11. The liquid injection hole 11 is located on the side of the protruding ring 13 facing the mounting cavity 14. The second pole 2 is connected to the protruding ring 13, and the mounting portion 21 is located within the mounting cavity 14 to block the liquid injection hole 11.

[0106] The protruding ring 13 is an annular structure protruding from one side of the base plate 12 .

[0107] The mounting cavity 14 is a space for accommodating the mounting portion 21 .

[0108] 3 and 5 , the thickness of the substrate 12 is smaller than the axial dimension of the second pole 2 along the injection hole 11. The injection hole 11 is formed in the substrate 12, and the axial dimension of the injection hole 11 is substantially equal to the thickness of the substrate 12.

[0109] For example, referring to FIG. 3 and FIG. 7 , the overall dimension of the pole assembly 101 along the axial direction of the liquid injection hole 11 is D3 .

[0110] For example, after the second pole 2 is mounted on the first pole 1 to block the liquid injection hole 11 , the overall size of the pole assembly 101 along the axial direction of the liquid injection hole 11 can be measured using a tape measure or a vernier caliper.

[0111] For example, the overall dimension of the pole assembly 101 along the axial direction of the liquid injection hole 11 may be less than or equal to 1 mm.

[0112] The substrate 12 and the protruding ring 13 are connected, and charged particles can move from the substrate 12 to the protruding ring 13 or from the protruding ring 13 to the substrate 12 .

[0113] In the disclosed embodiment, the mounting portion 21 is positioned within the mounting cavity 14 to block the liquid injection hole 11. By at least partially sinking the second electrode 2 into the mounting cavity 14, while still maintaining the larger axial dimension of the second electrode 2 along the liquid injection hole 11, the overall dimension of the electrode assembly 101 along the axial direction of the liquid injection hole 11 is reduced, thereby improving the volumetric energy density of the battery cell. Furthermore, the mounting portion 21 is positioned within the mounting cavity 14 to block the liquid injection hole 11. By at least partially sinking the second electrode 2 into the mounting cavity 14, the liquid injection hole 11 does not extend to the end of the protruding ring 13 facing away from the base plate 12, thereby suppressing the axial dimension of the liquid injection hole 11 and reducing the difficulty of machining the liquid injection hole 11.

[0114] In one embodiment, referring to FIG. 3 , the mounting portion 21 is connected to the protruding ring 13 so that the first pole 1 and the second pole 2 are pressed against each other.

[0115] In the embodiment of the present disclosure, the connection between the convex ring 13 and the mounting portion 21 enables mutual compression between the first pole 1 and the second pole 2. The mutual compression between the first pole 1 and the second pole 2 results in a tighter contact between the first pole 1 and the second pole 2, which is beneficial for enhancing the current carrying capacity between the first pole 1 and the second pole 2.

[0116] In one embodiment, referring to FIG. 5 , an internal thread 131 is formed on the side of the protruding ring 13 facing the mounting cavity 14 , and an external thread 211 is formed on the mounting portion 21 . The external thread 211 and the internal thread 131 are threadedly connected to squeeze the first pole 1 and the second pole 2 against each other.

[0117] An internal thread 131 is formed on a side of the protruding ring 13 facing the installation cavity 14 , that is, the internal thread 131 is located on a side wall of the installation cavity 14 .

[0118] In the embodiment of the present disclosure, a threaded connection is achieved by screwing the internal thread 131 and the external thread 211 together, so that the first pole 1 and the second pole 2 can be pressed against each other roughly along the axial direction of the injection hole 11, thereby enhancing the flow capacity between the first pole 1 and the second pole 2. Furthermore, the internal thread 131 and the external thread 211 are screwed together, so that the threads of the internal thread 131 and the threads of the external thread 211 engage with each other, increasing the contact area between the first pole 1 and the second pole 2, which is conducive to enhancing the flow capacity between the first pole 1 and the second pole 2. The threaded connection between the first pole 1 and the second pole 2 allows the first pole 1 and the second pole 2 to be assembled in a manner that is not contaminated by the electrolyte in the injection hole 11.

[0119] In one embodiment, the mounting portion 21 and the protruding ring 13 are riveted to press the first pole 1 and the second pole 2 against each other.

[0120] In the embodiment of the present disclosure, the connection between the first pole 1 and the second pole 2 is achieved by riveting, so that the first pole 1 and the second pole 2 are pressed against each other. The riveted first pole 1 and the second pole 2 can maintain a pressed state against each other even in a vibration environment.

[0121] In one embodiment, referring to Figures 3 and 5 , the second pole 2 includes a pole body 22 and a flange 23. The mounting portion 21 is formed on the pole body 22. The flange 23 is connected to the pole body 22, surrounding the pole body 22 and welded to the end of the protruding ring 13 facing away from the base plate 12.

[0122] The pole body 22 and the flange 23 are connected, and charged particles can move from the pole body 22 to the flange 23 or from the flange 23 to the pole body 22 .

[0123] For example, referring to FIG5 , the axial dimension of the flange 23 along the injection hole 11 is D4, and the axial dimension of the pole body 22 along the injection hole 11 is equal to the axial dimension of the second pole 2 along the injection hole 11, that is, the axial dimension of the pole body 22 along the injection hole 11 is D2, D4 <D2。

[0124] For example, before the second pole 2 is mounted on the first pole 1 , the axial dimension of the flange 23 along the liquid injection hole 11 may be measured using a tape measure or a vernier caliper.

[0125] Exemplarily, the flange 23 and the protruding ring 13 are welded by laser welding.

[0126] In the embodiment of the present disclosure, the flange 23 is welded to the end of the convex ring 13 facing away from the substrate 12, the mounting portion 21 is located in the mounting cavity 14, and the convex ring 13 protrudes from the substrate 12 and occupies a part of the space. The mounting portion 21 and the convex ring 13 are in a mutually crossed state, so that the axial dimension of the flange 23 along the injection hole 11 is smaller than the axial dimension of the pole body 22 along the injection hole 11. The smaller size of the flange 23 is conducive to the welding gun to weld the flange 23 and the convex ring 13 from the side of the flange 23 facing away from the convex ring 13, so that the flange 23 and the convex ring 13 are welded more firmly, which can improve the flow capacity of the flange 23 and the convex ring 13.

[0127] In one embodiment, referring to FIG. 3 , the mounting portion 21 is in contact with the substrate 12 , and / or the surface of the protruding ring 13 facing the mounting cavity 14 is in contact with the mounting portion 21 .

[0128] In the embodiment of the present disclosure, the fitting of the mounting portion 21 with the substrate 12 and / or the convex ring 13 is conducive to increasing the contact area between the second pole 2 and the first pole 1 and improving the current flow capacity between the first pole 1 and the second pole 2.

[0129] In one embodiment, referring to FIG. 7 , the surface of the second pole 2 facing away from the substrate 12 is flush with the surface of the protruding ring 13 facing away from the substrate 12 .

[0130] For example, referring to FIG. 7 , the surface of the second pole 2 facing away from the substrate 12 is the first surface 24 .

[0131] For example, referring to FIG. 7 , the surface of the protruding ring 13 facing away from the base plate 12 is the second surface 132 .

[0132] For example, referring to FIG. 7 , the overall dimension of the pole assembly 101 along the axial direction of the liquid injection hole 11 is D3 .

[0133] In the embodiment of the present disclosure, the corresponding surfaces of the second pole 2 and the protruding ring 13 are flush, and the second pole 2 does not protrude from the side of the protruding ring 13 away from the substrate 12, which is beneficial to reducing the overall size of the pole assembly 101 along the axial direction of the liquid injection hole 11 and improving the volume energy density of the battery cell.

[0134] The above embodiments are intended only to illustrate the technical solutions of the present disclosure, and are not intended to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. Such modifications or replacements do not deviate from the essence of the corresponding technical solutions and are intended to be included within the scope of the present disclosure. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts.

Claims

1. A pole assembly, comprising: The first pole is formed with a liquid injection hole; The second pole is connected to the first pole to block the injection hole.

2. The pole assembly according to claim 1, wherein: The second pole has a mounting portion, and the first pole includes: a substrate, wherein the injection hole is formed on the substrate; A convex ring is connected to one side of the substrate, the convex ring and the substrate form a mounting cavity, the mounting cavity is connected to the injection hole, the injection hole is located on the side of the convex ring facing the mounting cavity, the second pole is connected to the convex ring, and the mounting portion is located in the mounting cavity to block the injection hole.

3. The pole assembly according to claim 2, wherein: The mounting portion is connected to the convex ring so that the first pole and the second pole are pressed against each other.

4. The pole assembly according to claim 3, wherein: The convex ring is formed with an internal thread on one side facing the mounting cavity, and the mounting portion is formed with an external thread, and the external thread and the internal thread are threadedly connected to squeeze the first pole and the second pole against each other; or, the mounting portion and the convex ring are riveted to squeeze the first pole and the second pole against each other.

5. The pole assembly according to any one of claims 2 to 4, wherein: The second pole comprises: A pole body, wherein the mounting portion is formed on the pole body; A flange is connected to the pole body, the flange surrounds the pole body, and the flange is welded to an end of the convex ring away from the base plate.

6. The pole assembly according to any one of claims 2 to 5, wherein: The mounting portion is in contact with the substrate, and / or a surface of the convex ring facing the mounting cavity is in contact with the mounting portion.

7. The pole assembly according to any one of claims 2 to 6, wherein: A surface of the second pole facing away from the substrate is flush with a surface of the convex ring facing away from the substrate.

8. The pole assembly according to any one of claims 1 to 7, wherein: An axial dimension of the injection hole is smaller than an axial dimension of the second pole along the axial direction of the injection hole.

9. The pole assembly according to any one of claims 1 to 8, wherein: The second pole covers the outside of the injection hole, and along the axial projection of the injection hole, the projection area of ​​the injection hole is located within the projection area of ​​the second pole.

10. A capping assembly comprising: A main cover having a through hole, wherein the through hole passes through the main cover; The pole assembly according to any one of claims 1 to 9, wherein the pole assembly is inserted into the corresponding through hole; The insulating assembly is arranged between the main cover and the pole assembly to prevent the main cover and the pole assembly from being electrically connected.

11. A battery cell, comprising: shell; The cover assembly according to claim 10, and the cover assembly and the housing are arranged to form a receiving cavity; The battery cell is located in the accommodating cavity, and the battery cell has a pole ear, and the pole ear is electrically connected to the pole column assembly.

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