Sealing element of battery cell liquid injection hole, battery cell, battery and electric equipment

Abstract

The utility model provides a sealing element for a battery cell liquid injection hole, a battery cell, a battery and electric equipment, and relates to the technical field of batteries. The sealing element of the battery cell liquid injection hole provided by the utility model comprises a sealing part and a blocking part, the sealing part is used for being in sealing fit with a liquid injection hole of a battery cell; the swelling degree of the material for preparing the barrier part in the electrolyte of the battery cell is smaller than that of the material for preparing the sealing part; the blocking part is fixedly connected with the sealing part; along the axial direction of the liquid injection hole, the blocking part is arranged on one side, facing the inner cavity of the shell of the battery cell, of the sealing part so as to isolate the sealing part from the electrolyte. The sealing element of the battery cell liquid injection hole provided by the utility model can improve the sealing effect. The sealing element for the battery cell liquid injection hole provided by the utility model is used for sealing the liquid injection hole.

Description

Technical Field

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

[0002] During the production of battery cells, electrolyte needs to be injected into the inner cavity of the shell through the injection hole on the battery cell shell. After the electrolyte is injected, a glue nail is generally inserted into the injection hole to seal the injection hole. However, the sealing effect of the glue nail in the related art is poor. Summary of the invention

[0003] The present application provides a seal for a battery cell injection hole, a battery cell, a battery and an electrical device, which can improve the sealing effect.

[0004] In a first aspect, the present application provides a seal for a liquid injection hole of a battery cell, the seal for the liquid injection hole of the battery cell comprising a sealing portion and a barrier portion. The sealing portion is used to seal with the liquid injection hole of the battery cell; the swelling degree of the material of the barrier portion in the electrolyte of the battery cell is less than that of the material of the sealing portion; the barrier portion is fixedly connected to the sealing portion; along the axial direction of the liquid injection hole, the barrier portion is arranged on the side of the sealing portion facing the inner cavity of the shell of the battery cell to isolate the sealing portion from the electrolyte.

[0005] By providing a barrier part with a swelling degree smaller than that of the sealing part in the electrolyte, the barrier part isolates the sealing part from the electrolyte, which is beneficial to reducing the volume increase of the sealing part due to absorption of electrolyte, and further beneficial to reducing the excessive force between the sealing part and the circumferential surface of the injection hole caused by the increase in volume, so that the sealing part is not easily crushed by the circumferential surface of the injection hole, the sealing component has high durability and is not easily damaged, which is beneficial to improving the sealing effect.

[0006] In some implementations of the present application, a mounting groove is formed on the barrier portion, the depth direction of the mounting groove is parallel to the axial direction of the injection hole, and the first end of the sealing portion cooperates with the mounting groove.

[0007] By making the first end of the sealing part cooperate with the installation groove, the barrier part and the sealing part are installed together, which is conducive to improving the installation stability of the sealing part and the barrier part. In addition, the first end cooperates with the installation groove, so that the barrier part covers the end of the sealing part close to the inner cavity of the shell, which is conducive to improving the effect of the barrier part isolating the sealing part from the electrolyte.

[0008] In some implementations of the present application, along the circumference of the liquid injection hole, the inner wall of the mounting groove surrounds the first end of the sealing portion for a circle.

[0009] By making the inner wall of the mounting groove surround the first end of the sealing part along the circumference of the injection hole, it is beneficial to improve the stability of the installation of the sealing part and the mounting groove, as well as the covering effect of the barrier part on the sealing part, which is beneficial to improve the effect of the barrier part isolating the sealing part from the electrolyte.

[0010] In some implementations of the present application, an opening of the mounting groove opposite to its bottom surface is sealingly matched with the first end of the sealing portion.

[0011] By making the opening of the installation groove relative to its bottom surface seal with the first end of the sealing part, it is helpful to improve the stability of the installation of the sealing part and the installation groove, as well as the covering effect of the barrier part on the sealing part, which is helpful to improve the effect of the barrier part isolating the sealing part from the electrolyte.

[0012] In some implementations of the present application, an end surface of the mounting groove away from its bottom surface is combined with the liquid injection hole, so that the barrier portion isolates the sealing portion from the electrolyte.

[0013] The barrier part is formed with an open side surface to isolate the sealing part from the electrolyte, thereby facilitating the processing and manufacturing of the barrier part and helping to reduce costs.

[0014] In some implementations of the present application, the end surface of the mounting groove away from its own bottom surface is used to fit with the end surface of the injection hole close to the inner cavity of the shell, so that the barrier part closes the injection hole to isolate the sealing part from the electrolyte; the circumferential contour of the opening of the mounting groove relative to its own bottom surface is greater than or equal to the contour of the edge of the end of the injection hole close to the inner cavity of the shell.

[0015] The injection hole is closed by making the side of the barrier part with an opening fit with the end face of the injection hole close to the inner cavity of the shell, that is, the barrier part is located in the inner cavity of the shell and does not extend into the injection hole, which is conducive to increasing the contact area between the sealing part and the inner wall of the injection hole, and is conducive to improving the sealing effect of the sealing part. In addition, the circumferential contour of the opening is greater than or equal to the contour of the edge of the injection hole close to the inner cavity of the shell, so that the sealing part can contact the edge of the injection hole close to the inner cavity of the shell, and the contact area between the sealing part and the inner wall of the injection hole is large, which is conducive to improving the sealing effect.

[0016] In some implementations of the present application, the outer contour of the end surface of the barrier portion close to the sealing portion is larger than the contour of the edge of the end of the injection hole close to the inner cavity of the shell; the end surface of the barrier portion close to the sealing portion is used to fit with the end surface of the end of the injection hole close to the inner cavity of the shell, so that the barrier portion closes the injection hole and isolates the sealing portion from the electrolyte.

[0017] By making the end surface of the barrier part close to the sealing part fit with the end surface of the injection hole close to the inner cavity of the shell to close the injection hole, it is beneficial to improve the isolation effect of the barrier part on the sealing part and the electrolyte. In addition, the barrier part can isolate the sealing part from the electrolyte without extending into the injection hole, which is beneficial to have a larger contact surface between the sealing part and the inner wall of the injection hole, thereby improving the sealing effect of the seal.

[0018] In some implementations of the present application, along the axial direction of the injection hole, the length of the sealing portion is greater than the injection hole.

[0019] By making the sealing part more flexible and longer, the contact area of ​​the peripheral surface of the injection hole of the sealing part is increased, thereby improving the sealing effect. The longer length of the sealing part is also conducive to increasing the contact area between the sealing part and the barrier part, which is conducive to improving the stability of the installation of the sealing part and the barrier part.

[0020] In some implementations of the present application, in the radial direction of the injection hole, the sealing portion has greater flexibility than the blocking portion.

[0021] By making the sealing portion more flexible, the sealing portion can fit tightly with the circumferential surface of the injection hole, which is beneficial to improving the sealing effect of the sealing portion.

[0022] In some implementations of the present application, the sealing portion is made of a rubber material.

[0023] By making the sealing part out of rubber material, the cost is low and the flexibility is greater, so a better sealing effect can be achieved.

[0024] In some implementations of the present application, the barrier portion is made of plastic material.

[0025] By making the barrier part of a plastic material, the cost is low, and the swelling degree in the electrolyte is small, so that a better effect of blocking the electrolyte can be achieved.

[0026] In a second aspect, the present application provides a battery cell, comprising a shell and a seal for the battery cell injection hole provided in the first aspect of the present application, wherein the shell has the injection hole; and the sealing portion is in sealing cooperation with the injection hole.

[0027] The battery cell provided in the present application includes the sealing member for the battery cell injection hole provided in the first aspect of the present application, which can achieve the same effect, that is, can improve the sealing effect.

[0028] In a third aspect, the present application provides a battery, comprising the battery cell provided in the second aspect of the present application, wherein the number of the battery cells is multiple, the multiple battery cells are distributed in an array, and are connected in series, in parallel, or in a mixed manner through a busbar component.

[0029] The battery provided in the present application includes the battery cell provided in the second aspect of the present application, which can achieve the same effect, that is, it can improve the sealing effect.

[0030] In a fourth aspect, the present application provides an electrical device, which includes an electrical body and the battery provided in the third aspect of the present application, and the battery is used to supply power to the electrical body.

[0031] The electrical equipment provided in the present application includes the battery provided in the third aspect of the present application, which can achieve the same effect, that is, it can improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0033] Figure 1 is a cross-sectional view of a top cover without a seal installed in some embodiments of the present application;

[0034] Figure 2 This is one of the structural schematic diagrams of the sealing member in some embodiments of the present application;

[0035] Figure 3 One of the cross-sectional views of the sealing member in some embodiments of the present application;

[0036] Figure 4 A cross-sectional view of a top cover with a seal installed in some embodiments of the present application;

[0037] Figure 5 This is the second structural schematic diagram of the sealing member in some embodiments of the present application;

[0038] Figure 6 This is a second cross-sectional view of a sealing member in some embodiments of the present application;

[0039] Figure 7 This is the third structural schematic diagram of the sealing member in some embodiments of the present application;

[0040] Figure 8 This is the third cross-sectional view of the seal in some embodiments of the present application.

[0041] Description of reference numerals:

[0042] 01-end cover; 011-injection hole; 0111-circumferential surface of the injection hole; 0112-first end face; 1-sealing part; 11-matching surface; 12-first end of the sealing part; 2-barrier part; 21-second end face; 22-mounting groove; 23-guide slope; a-first direction; b-radial direction of the injection hole; c-length of the injection hole; d-length of the sealing part. DETAILED DESCRIPTION

[0043] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the technical steps may be interchanged in a specific order or sequence without conflict, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0047] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In some embodiments of the present application, "first", "second", "third", etc. may also refer to the same object. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "abutment" should be understood in a broad sense, and can be direct contact or contact through an intermediate medium layer. It can be contact with essentially no interaction force between the two contacting parties, or it can be contact with interaction force between the two contacting parties.

[0051] Below, this application is described in detail.

[0052] During the production of battery cells, electrolyte needs to be injected into the inner cavity of the shell through the injection hole on the battery cell shell. After the electrolyte is injected, a glue nail is generally inserted into the injection hole to seal the injection hole. However, the sealing effect of the glue nail in the related art is poor.

[0053] The following is an analysis of the reasons why the sealing effect of the rubber nails in the related art is poor, and the analysis process and conclusions are part of the creativity of this application.

[0054] The rubber nails in the related art tend to absorb more electrolyte, resulting in a larger volume expansion, i.e. swelling. When the volume of the rubber nail increases, the pre-tightening force between the rubber nail and the circumferential surface of the injection hole increases, and the rubber nail is easily crushed under the action of the pre-tightening force.

[0055] The present application provides a seal for a battery cell injection hole, which includes a sealing portion and a barrier portion. The sealing portion is used to seal with the injection hole of the battery cell; the material used to make the barrier portion has a lower swelling degree in the electrolyte of the battery cell than the material used to make the sealing portion; the barrier portion is fixedly connected to the sealing portion; along the axial direction of the injection hole, the barrier portion is arranged on the side of the sealing portion facing the inner cavity of the shell of the battery cell to isolate the sealing portion from the electrolyte. By providing a barrier portion having a swelling degree less than that of the sealing portion in the electrolyte, the barrier portion isolates the sealing portion from the electrolyte, which is beneficial to reducing the increase in volume of the sealing portion due to absorption of the electrolyte, and further beneficial to reducing the excessive force between the sealing portion and the circumferential surface of the injection hole due to the increase in volume, so that the sealing portion is not easily crushed by the circumferential surface of the injection hole, and the sealing portion has high durability and is not easily damaged, which is beneficial to improving the sealing effect.

[0056] The sealing member of the battery cell injection hole provided in the present application is applicable to the battery cell. Specifically, the present application further provides a battery cell.

[0057] The battery core comprises a shell and a sealing member for a liquid injection hole of the battery core, wherein the shell has the liquid injection hole; and the sealing member is in sealing cooperation with the liquid injection hole.

[0058] In the embodiment of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0059] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0060] The present application provides a battery, the battery includes a plurality of cells, the plurality of cells are arranged in an array and connected in series, in parallel or in mixed connection through a current converging component. The battery provided in the present application may be a battery module, a battery pack or an energy storage system.

[0061] The technical solutions described in the embodiments of the present application are applicable to various battery-powered electrical devices, which include an electrical device and a battery, and the battery is used to power the electrical device. For example, the electrical device may be a mobile phone, a portable device, a laptop computer, a battery car, an electric toy, an electric tool, a vehicle, a ship, and a spacecraft, for example, a spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft.

[0062] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0063] Please refer to Figure 1 to Figure 4 , Figure 1 to Figure 4 Belong to the same embodiment. The present application provides a seal for a liquid injection hole of a battery cell, and the seal for the liquid injection hole of the battery cell comprises a sealing portion 1 and a barrier portion 2. The sealing portion 1 is used to seal with the liquid injection hole 011 of the battery cell; the swelling degree of the material of the barrier portion 2 in the electrolyte of the battery cell is lower than that of the material of the sealing portion 1; the barrier portion 2 is fixedly connected to the sealing portion 1; along the axial direction of the liquid injection hole 011, the barrier portion 2 is arranged on the side of the sealing portion 1 facing the inner cavity of the outer shell of the battery cell to isolate the sealing portion 1 from the electrolyte.

[0064] Generally, please refer to Figure 1The injection hole 011 is formed on the outer shell of the battery cell. The outer shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. Generally, the outer shell includes an end cap 01 and a shell. The shell is provided with an opening. The end cap 01 closes the opening to form a closed space for accommodating substances such as electrode assemblies and electrolytes. The injection hole 011 is generally formed on the end cap 01. The injection hole 011 is a through hole. The axial direction of the through hole is the thickness direction of the end cap 01, that is, the through hole passes through the end cap 01 along the thickness direction of the end cap 01, so that the inner cavity of the shell is connected with the external environment of the shell through the injection hole 011, so that the electrolyte can flow from the outside of the shell into the inner cavity of the shell through the injection hole 011. After the electrolyte is injected, the injection hole 011 is sealed by a seal.

[0065] The sealing part 1 in the embodiment of the present application is sealed with the injection hole 011, that is, the sealing part 1 is inserted into the injection hole 011, and the circumferential surface of the sealing part 1 is sealed with the circumferential surface 0111 of the injection hole, so that the sealing part 1 blocks the injection hole 011. The part where the sealing part 1 is in contact with the circumferential surface 0111 of the injection hole is shown in FIG. Figure 2 and Figure 3 The mating surface 11 is located in the inner cavity of the injection hole 011 and extends along the circumference of the injection hole 011 to form a circumferential structure, which is coaxial with the injection hole 011. Along the axial direction of the injection hole 011, the length of the mating surface 11 can be equal to the length c of the injection hole, that is, the circumferential surface 0111 of the injection hole is completely in contact with the mating surface 11, or the length of the mating surface 11 can be less than the length c of the injection hole, that is, a part of the circumferential surface 0111 of the injection hole is in contact with the mating surface 11.

[0066] In the embodiment of the present application, the sealing portion 1 is a shaft-type part, and the axial direction is the same as the axial direction of the injection hole 011.

[0067] In the embodiment of the present application, during the process of installing the seal onto the injection hole 011, the sealing portion 1 extends into the injection hole 011 along the first direction a. It can be understood that the first direction a is parallel to the axial direction of the injection hole 011, and points from the side of the injection hole 011 away from the inner cavity of the shell to the side close to the inner cavity of the shell.

[0068] The swelling degree in the embodiments of the present application has the same meaning as that generally understood by those skilled in the art, and refers to the ratio of the volume of the substance when it absorbs solvent molecules to reach equilibrium under a certain temperature and pressure to the volume when it does not absorb solvent molecules. When the substance absorbs solvent molecules to reach equilibrium, that is, when the substance is completely immersed in the solvent, no matter how long the substance is in contact with the solvent, the amount of solvent molecules absorbed by the substance no longer increases, and a state of equilibrium is reached. In the embodiments of the present application, the solvent refers to an electrolyte, and the temperature and pressure under the above-mentioned certain temperature and pressure are the same as the temperature and pressure of the electrolyte of the battery cell when the battery cell is working normally.

[0069] The barrier portion 2 and the sealing portion 1 in the embodiment of the present application may be fixedly connected in a variety of ways, such as integral injection molding, bonding, bonding by adhesive, interference fit, snap fit or threaded fit.

[0070] By providing a barrier part 2 having a swelling degree less than that of the sealing part 1 in the electrolyte, the barrier part 2 isolates the sealing part 1 from the electrolyte, which is beneficial to reducing the volume increase of the sealing part 1 due to absorption of the electrolyte, and further beneficial to reducing the excessive force between the sealing part 1 and the circumferential surface of the injection hole 011 caused by the increase in volume, so that the sealing part 1 is not easily crushed by the circumferential surface of the injection hole 011, the sealing component has high durability and is not easily damaged, which is beneficial to improving the sealing effect.

[0071] In the embodiment of the present application, there are many ways to implement the barrier part 2 to isolate the sealing part 1 from the electrolyte.

[0072] In some embodiments of this application, please refer to Figure 1 to Figure 4 The barrier part 2 includes a first matching sub-part. The first matching sub-part is located in the inner cavity of the hole section of the injection hole 011 close to the inner cavity of the shell, and is sealed with the hole section, that is, the first matching sub-part blocks one end of the injection hole 011 close to the inner cavity of the shell, thereby isolating the sealing part 1 from the electrolyte.

[0073] The first matching sub-portion in the embodiment of the present application can also produce a certain sealing effect on the injection hole 011, but the sealing effect of the first matching sub-portion on the injection hole 011 is less than the sealing effect of the sealing portion 1 on the injection hole 011. Generally, the sealing fit between the matching surface 11 and the circumferential surface 0111 of the injection hole is tighter than the sealing fit between the circumferential surface of the first matching sub-portion and the circumferential surface 0111 of the injection hole.

[0074] In some embodiments of this application, please refer to Figure 1 to Figure 4 , in the radial direction b of the injection hole, the flexibility of the sealing part 1 is greater than that of the barrier part 2. By making the sealing part 1 more flexible, the mating surface 11 can fit tightly with the circumferential surface 0111 of the injection hole, which is beneficial to improving the sealing effect of the sealing part 1. In some embodiments of the present application, the sealing part 1 is made of a rubber material. By making the sealing part 1 made of a rubber material, the cost is low and the flexibility is high, which can achieve a better sealing effect. In some embodiments of the present application, the barrier part 2 is made of a plastic material. By making the barrier part 2 made of a plastic material, the cost is low and the swelling degree in the electrolyte is small, which can achieve a better effect of blocking the electrolyte, and when supported by the circumferential surface 0111 of the injection hole, it can also achieve a better sealing effect on the injection hole 011.

[0075] In some embodiments of this application, please refer to Figure 1 to Figure 4The barrier portion 2 includes a second matching sub-portion. The second matching sub-portion is a rod-shaped structure, the second matching sub-portion is coaxial with the injection hole 011, the second matching sub-portion is located in the inner cavity of the shell, and the outer contour of the end surface of one end close to the injection hole 011 along the axial direction is consistent with the contour of the edge of the one end of the injection hole 011 close to the inner cavity of the shell, so that the outer edge of the end surface of the second matching sub-portion close to the injection hole 011 is combined with the edge of the one end of the injection hole 011 close to the inner cavity of the shell, so that the end surface seals the end of the injection hole 011 close to the inner cavity of the shell, and the sealing portion 1 is isolated from the electrolyte.

[0076] In some embodiments of this application, please refer to Figure 1 to Figure 4 The outer contour of the end face of the barrier part 2 close to the sealing part 1 is larger than the contour of the edge of the end of the injection hole 011 close to the inner cavity of the shell; the end face of the barrier part 2 close to the sealing part 1 is used to fit with the end face of the end of the injection hole 011 close to the inner cavity of the shell, so that the barrier part 2 closes the injection hole 011 and isolates the sealing part 1 from the electrolyte.

[0077] In the embodiment of the present application, the end surface of the injection hole 011 close to the inner cavity of the shell refers to the first end surface 0112 in the figure.

[0078] In the embodiment of the present application, the end face of the barrier portion 2 close to the sealing portion 1 refers to the second end face 21 in the figure, which is the end face of the barrier portion 2 close to the sealing portion 1 along the axial direction of the injection hole 011, and its direction is from the side of the injection hole 011 close to the inner cavity of the shell to the side away from the inner cavity of the shell.

[0079] By making the end surface of the barrier part 2 close to the sealing part 1 fit with the end surface of the injection hole 011 close to the inner cavity of the shell to close the injection hole 011, it is beneficial to improve the isolation effect of the barrier part 2 on the sealing part 1 and the electrolyte. In addition, the barrier part 2 can isolate the sealing part 1 from the electrolyte without extending into the injection hole 011, which is beneficial to have a larger contact surface between the sealing part 1 and the inner wall of the injection hole 011, thereby improving the sealing effect of the seal.

[0080] In some embodiments of this application, please refer to Figure 1 to Figure 4 A mounting groove 22 is formed on the barrier portion 2 , the depth direction of the mounting groove 22 is parallel to the axial direction of the injection hole 011 , and the first end 12 of the sealing portion cooperates with the mounting groove 22 .

[0081] The depth direction of the mounting groove 22 in the embodiment of the present application is directed from the side of the injection hole 011 away from the inner cavity of the shell to the side close to the inner cavity of the shell.

[0082] The first end 12 of the sealing portion in the embodiment of the present application is also the end of the sealing portion 1 close to the inner cavity of the shell. The first end 12 of the sealing portion extends into the installation groove 22 along the depth direction of the installation groove 22 .

[0083] By making the first end 12 of the sealing part cooperate with the installation groove 22, the barrier part 2 and the sealing part 1 are installed together, which is conducive to improving the installation stability of the sealing part 1 and the barrier part 2. In addition, the first end cooperates with the installation groove 22, so that the barrier part 2 covers the end of the sealing part 1 close to the inner cavity of the shell, which is conducive to improving the effect of the barrier part 2 isolating the sealing part 1 from the electrolyte.

[0084] In some embodiments of this application, please refer to Figure 1 to Figure 4 Along the circumference of the injection hole 011, the inner wall of the mounting groove 22 surrounds the first end 12 of the sealing portion.

[0085] By making the inner wall of the mounting groove 22 surround the first end 12 of the sealing part along the circumference of the injection hole 011, it is beneficial to improve the stability of the installation of the sealing part 1 and the mounting groove 22, as well as the covering effect of the barrier part 2 on the sealing part 1, which is beneficial to improve the effect of the barrier part 2 isolating the sealing part 1 from the electrolyte.

[0086] In some embodiments of this application, please refer to Figure 1 to Figure 4 The inner cavity size of the mounting groove 22 matches the size of one end of the sealing portion 1. In this way, the mounting groove 22 is stably matched with one end of the sealing portion 1, which is conducive to improving the stability of the installation.

[0087] In some embodiments of this application, please refer to Figure 1 to Figure 4 The opening of the mounting groove 22 opposite to its bottom surface is sealed with the first end 12 of the sealing portion.

[0088] By making the opening of the installation groove 22 opposite to its bottom surface and the first end 12 of the sealing part seal in cooperation, it is beneficial to improve the stability of the installation of the sealing part 1 and the installation groove 22, as well as the covering effect of the barrier part 2 on the sealing part 1, which is beneficial to improve the effect of the barrier part 2 isolating the sealing part 1 from the electrolyte.

[0089] In some embodiments of this application, please refer to Figure 1 to Figure 4 The end surface of the mounting groove 22 away from the bottom surface thereof, that is, the side surface of the barrier portion 2 having an opening is combined with the liquid injection hole 011 to isolate the sealing portion 1 from the electrolyte.

[0090] The barrier part 2 is formed with an open side to isolate the sealing part 1 from the electrolyte, thereby facilitating the processing and manufacturing of the barrier part 2 and helping to reduce costs.

[0091] In some embodiments of the present application, the barrier portion 2 is formed with an open side surface, that is, an end surface of the barrier portion 2 close to the sealing portion 1 .

[0092] In some embodiments of this application, please refer to Figure 1 to Figure 4The mounting groove 22 can be formed on the first matching sub-part, the barrier part 2 is formed with an open side located in the inner cavity of the injection hole 011, and the outer edge is combined with the circumferential surface 0111 of the injection hole everywhere, so that the barrier part 2 isolates the sealing part 1 from the electrolyte.

[0093] In some embodiments of this application, please refer to Figure 1 to Figure 4 The mounting groove 22 can be formed on the second matching sub-part, and the outer edge of the side of the barrier part 2 with an opening is combined with the edge of the injection hole 011 at one end close to the inner cavity of the shell, so that the barrier part 2 isolates the sealing part 1 from the electrolyte.

[0094] In some embodiments of this application, please refer to Figure 1 to Figure 4 The barrier portion 2 is formed with an open side surface for fitting with the end surface of the injection hole 011 close to the inner cavity of the shell, so that the barrier portion 2 closes the injection hole 011 to isolate the sealing portion 1 from the electrolyte. On this basis, in some embodiments of the present application, the circumferential contour of the opening is greater than or equal to the contour of the edge of the injection hole 011 close to the inner cavity of the shell.

[0095] By making the side surface of the barrier part 2 with an opening fit with the end surface of the injection hole 011 close to the inner cavity of the shell, the injection hole 011 is closed, that is, the barrier part 2 is located in the inner cavity of the shell and does not extend into the injection hole 011, which is conducive to increasing the contact area between the sealing part 1 and the inner wall of the injection hole 011, and is conducive to improving the sealing effect of the sealing part 1. In addition, the circumferential contour of the opening is greater than or equal to the contour of the edge of the end of the injection hole 011 close to the inner cavity of the shell, so that the sealing part 1 can contact the edge of the end of the injection hole 011 close to the inner cavity of the shell, and the contact area between the sealing part 1 and the inner wall of the injection hole 011 is large, which is conducive to improving the sealing effect.

[0096] In some embodiments of this application, please refer to Figure 1 to Figure 4 The circumferential contour of the opening is greater than or equal to the contour of the edge of the end of the injection hole 011 close to the inner cavity of the shell, and the opening is sealed with the first end 12 of the sealing part. In this way, the sealing part 1 is sealed with the edge of the end of the injection hole 011 close to the inner cavity of the shell, which is conducive to improving the sealing effect.

[0097] In some embodiments of this application, please refer to Figure 1 to Figure 4 , along the axial direction of the injection hole 011 , the length d of the sealing portion is greater than the injection hole 011 .

[0098] By making the sealing part 1 more flexible and the sealing part length d longer, it is beneficial to increase the contact area of ​​the circumferential surface of the injection hole 011 of the sealing part 1, thereby improving the sealing effect. The longer length d of the sealing part is also beneficial to increase the contact area between the sealing part 1 and the barrier part 2, which is beneficial to improve the stability of the installation of the sealing part 1 and the barrier part 2.

[0099] In some embodiments of this application, please refer to Figure 1 to Figure 4 The circumferential outer surface of the barrier portion 2 also includes a guide slope 23, which has an angle with the axial direction of the injection hole 011. Along the axial direction a of the injection hole 011, the second end of the guide slope 23 is close to the central axis of the injection hole 011 relative to the first end, and the second end of the guide slope 23 is away from the injection hole 011 and away from the inner cavity of the shell relative to the first end.

[0100] By setting the guiding bevel 23, the guiding bevel 23 can guide the sealing member when it is inserted into the injection hole 011, so that even if the sealing member is eccentric with the injection hole 011, the guiding bevel 23 can guide the sealing member to move to a position coaxial with the injection hole 011, so that the sealing member can be smoothly inserted into the injection hole 011, which is conducive to improving the convenience of installation.

[0101] In some embodiments of this application, please refer to Figure 1 to Figure 4 The guiding inclined surface 23 extends along the circumference of the injection hole 011 to form a circumferential structure. This is conducive to further improving the convenience of installation. On this basis, in some embodiments of the present application, the guiding inclined surface 23 can be a spherical surface or a conical surface. For spherical surface, please refer to Figure 1 to Figure 4 , please refer to the conical surface Figures 5 to 8 .in, Figure 5 and Figure 6 Belonging to the same embodiment, Figure 7 and Figure 8 Belong to the same embodiment.

[0102] In some embodiments of this application, please refer to Figure 1 to Figure 4 The end surface of the barrier part 2 close to the sealing part 1 is fitted with the end surface of the injection hole 011 close to the inner cavity of the shell, so that the barrier part 2 closes the injection hole 011 to isolate the sealing part 1 from the electrolyte. The first end of the guide slope 23 is combined with the end surface of the barrier part 2 close to the sealing part 1. In this way, the extension length of the guide slope 23 is long, which is conducive to playing a sufficient guiding role.

[0103] In some embodiments of this application, please refer to Figure 1 to Figure 4 The side surface of the barrier part 2 with an opening is fitted with the end surface of the injection hole 011 close to the inner cavity of the shell, so that the barrier part 2 closes the injection hole 011 to isolate the sealing part 1 from the electrolyte. The first end of the guide slope 23 is combined with the side surface of the barrier part 2 with an opening. The extension direction of the side surface of the mounting groove 22 is the same as the extension direction of the guide slope 23. Such a structural form facilitates the processing and manufacturing of the barrier part 2.

[0104] In some embodiments of this application, please refer to Figure 1 to Figure 4The sealing part 1 is made of rubber material, and the barrier part 2 is made of plastic material. A mounting groove 22 is formed on the barrier part 2, and the depth direction of the mounting groove 22 is parallel to the axial direction of the injection hole 011, and the first end 12 of the sealing part cooperates with the mounting groove 22. The opening of the mounting groove 22 opposite to its own bottom surface is sealed with the first end 12 of the sealing part. The barrier part 2 is formed with an opening on the side surface for fitting with the end surface of the injection hole 011 close to the inner cavity of the shell, so that the barrier part 2 closes the injection hole 011 to isolate the sealing part 1 from the electrolyte; the circumferential contour of the opening is greater than or equal to the contour of the edge of the injection hole 011 close to the inner cavity of the shell.

[0105] By making the side surface of the barrier part 2 with an opening fit with the end surface of the injection hole 011 close to the inner cavity of the shell, the injection hole 011 is closed, that is, the barrier part 2 is located in the inner cavity of the shell and does not extend into the injection hole 011, which is conducive to increasing the contact area between the sealing part 1 and the inner wall of the injection hole 011, and is conducive to improving the sealing effect of the sealing part 1. In addition, the circumferential contour of the opening is greater than or equal to the contour of the edge of the end of the injection hole 011 close to the inner cavity of the shell, so that the sealing part 1 can contact the edge of the end of the injection hole 011 close to the inner cavity of the shell, and the contact area between the sealing part 1 and the inner wall of the injection hole 011 is large, which is conducive to improving the sealing effect.

[0106] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A seal for a battery cell injection hole, characterized in that: include: A sealing part, used for sealing with the liquid injection hole of the battery cell; The barrier part is made of a material whose swelling degree in the electrolyte of the battery cell is lower than that of the material of the sealing part; the barrier part is fixedly connected to the sealing part; along the axial direction of the injection hole, the barrier part is arranged on a side of the sealing part facing the inner cavity of the shell of the battery cell to isolate the sealing part from the electrolyte.

2. The sealing member for the battery cell injection hole according to claim 1, characterized in that: The barrier portion is formed with a mounting groove, the depth direction of the mounting groove is parallel to the axial direction of the liquid injection hole, and the first end of the sealing portion is matched with the mounting groove.

3. The sealing member for the battery cell injection hole according to claim 2, characterized in that: Along the circumferential direction of the liquid injection hole, the inner wall of the mounting groove surrounds the first end of the sealing portion.

4. The sealing member for the battery cell injection hole according to claim 3, characterized in that: The opening of the installation groove opposite to the bottom surface thereof is sealingly matched with the first end of the sealing portion.

5. The sealing member for the battery cell injection hole according to claim 3, characterized in that: The end surface of the mounting groove at one end away from the bottom surface thereof is combined with the liquid injection hole, so that the blocking part isolates the sealing part from the electrolyte.

6. The sealing member for the battery cell injection hole according to claim 4, characterized in that: The end surface of the mounting groove at one end away from the bottom surface thereof is combined with the liquid injection hole, so that the blocking part isolates the sealing part from the electrolyte.

7. The sealing member for the battery cell injection hole according to claim 5, characterized in that: The end surface of the mounting groove away from its bottom surface is used to fit with the end surface of the injection hole close to the inner cavity of the shell, so that the barrier part closes the injection hole to isolate the sealing part from the electrolyte; the circumferential contour of the opening of the mounting groove relative to its bottom surface is greater than or equal to the contour of the edge of the injection hole close to the inner cavity of the shell.

8. The sealing member for the battery cell injection hole according to claim 6, characterized in that: The end surface of the mounting groove away from its bottom surface is used to fit with the end surface of the injection hole close to the inner cavity of the shell, so that the barrier part closes the injection hole to isolate the sealing part from the electrolyte; the circumferential contour of the opening of the mounting groove relative to its bottom surface is greater than or equal to the contour of the edge of the injection hole close to the inner cavity of the shell.

9. The sealing member for the battery cell liquid injection hole according to any one of claims 1 to 8, characterized in that: The outer contour of the end surface of the barrier portion close to the sealing portion is larger than the contour of the edge of the end of the injection hole close to the inner cavity of the shell; the end surface of the barrier portion close to the sealing portion is used to fit with the end surface of the injection hole close to the inner cavity of the shell, so that the barrier portion closes the injection hole and isolates the sealing portion from the electrolyte.

10. The sealing member for the battery cell liquid injection hole according to any one of claims 1 to 8, characterized in that: Along the axial direction of the liquid injection hole, the length of the sealing portion is greater than that of the liquid injection hole.

11. The sealing member for the battery cell liquid injection hole according to any one of claims 1 to 8, characterized in that: In the radial direction of the liquid injection hole, the sealing portion has greater flexibility than the blocking portion.

12. The sealing member for the battery cell liquid injection hole according to any one of claims 1 to 8, characterized in that: The sealing part is made of rubber material.

13. The sealing member for the battery cell liquid injection hole according to any one of claims 1 to 8, characterized in that: The blocking part is made of plastic material.

14. A battery cell, characterized in that: include: A housing having a liquid injection hole; The sealing member for the liquid injection hole of a battery cell according to any one of claims 1 to 13, wherein the sealing portion is in sealing cooperation with the liquid injection hole.

15. A battery, characterized in that: Including the battery cell as described in claim 14, the number of the battery cells is multiple, and the multiple battery cells are distributed in an array and connected in series, parallel or mixed through a busbar component.

16. An electrical equipment, characterized in that: include: Electricity-consuming entity; The battery as claimed in claim 15 is used to supply power to the power-consuming entity.

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