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 arranged in a liquid injection hole of a battery cell and comprises a matching surface, and the matching surface is used for being in sealing fit with the circumferential surface of the liquid injection hole; 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; in 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 matching surface, and the blocking part is used for being combined with the circumferential surface of the liquid injection hole so as to block communication between a seam between the matching surface and the circumferential surface of the liquid injection hole and the inner cavity of the shell. 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 the 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 be arranged in the liquid injection hole of the battery cell, the sealing portion comprises a mating surface, the mating surface is used to seal and cooperate with the circumferential surface of the liquid injection hole; 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 mating surface that faces the inner cavity of the shell of the battery cell, and the barrier portion is used to combine with the circumferential surface of the liquid injection hole to block the connection between the joint between the mating surface and the circumferential surface of the liquid injection hole and the inner cavity of the shell.

[0005] By providing a barrier portion having a swelling degree less than that of the sealing portion in the electrolyte, the barrier portion blocks the connection between the joint between the mating surface and the circumferential surface of the injection hole and the inner cavity of the shell, which is beneficial to reducing the contact between the portion of the sealing portion close to the mating surface and the electrolyte, thereby helping to reduce the volume increase of this portion due to swelling, and further helping to reduce the excessive force between the mating surface 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, 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, in the axial direction of the injection hole, the mating surface and the injection hole have a length difference; along the radial direction of the injection hole, the barrier portion is used to be supported between the circumferential surface of the injection hole and the circumferential outer surface of the sealing portion, so as to be combined with the circumferential surface of the injection hole to block the connection between the joint and the inner cavity of the shell.

[0007] By supporting the barrier part between the circumferential surface of the injection hole and the circumferential outer surface of the sealing part along the radial direction of the injection hole, the action force between the barrier part and the circumferential surface of the injection hole is stronger, which is beneficial to make the barrier part and the circumferential surface of the injection hole more closely combined, thereby facilitating improving the effect of the barrier part in blocking the electrolyte.

[0008] In some implementations of the present application, the sum of the length of the barrier portion and the supporting portion of the circumferential surface of the injection hole in the axial direction of the injection hole and the spacing between the supporting portion and the matching surface in the axial direction of the injection hole is equal to the length difference.

[0009] By making the barrier portion longer, the barrier portion can be directly combined with the edge of the end of the injection hole close to the inner cavity of the shell, which is conducive to improving the effect of blocking the electrolyte. The barrier portion is directly combined with the edge of the end of the injection hole close to the inner cavity of the shell, that is, along the radial direction of the injection hole, the sealing portion is supported on the edge of the end of the injection hole close to the inner cavity of the shell through the barrier portion, so that the sealing portion is not easily affected by the stress concentration effect generated by the edge of the end of the injection hole close to the inner cavity of the shell, which is conducive to improving the stress condition of the sealing portion and improving the durability of the sealing component.

[0010] In some implementations of the present application, in the axial direction of the injection hole, the distance between the barrier portion and the matching surface is greater than or equal to the length difference of the barrier portion.

[0011] By making the distance between the barrier part and the matching surface in the axial direction of the injection hole and the length of the barrier part greater than the length difference, when the seal is installed on the injection hole, along the axial direction of the injection hole, the end of the barrier part away from the sealing part extends to the side of the injection hole close to the inner cavity of the shell, which is conducive to improving the effect of the barrier part in blocking the electrolyte. By making the distance between the barrier part and the matching surface in the axial direction of the injection hole and the length of the barrier part equal to the length difference, it is conducive to saving materials.

[0012] In some implementations of the present application, in the axial direction of the liquid injection hole, the length of the mating surface is equal to 0.5 to 0.7 times the length of the liquid injection hole.

[0013] By making the length of the matching surface longer, the contact area between the sealing portion and the circumferential surface of the injection hole is larger, which is beneficial to improving the sealing effect of the sealing portion.

[0014] In some implementations of the present application, the blocking portion is combined with the mating surface to block the communication between the seam and the inner cavity of the shell.

[0015] By combining the barrier part with the matching surface, the barrier part and the matching surface are relatively close, which is beneficial to improving the barrier effect of the barrier part on the seam.

[0016] In some implementations of the present application, the outer surface of the sealing portion includes a first surface, the first surface is located in the inner cavity of the injection hole, the first surface has an angle with the axial direction of the injection hole, and the first surface is combined with the mating surface; the barrier portion includes a first fitting surface, the first fitting surface is fitted with the first surface and combined with the mating surface.

[0017] By making the first fitting surface of the barrier part fit with the first surface and combined with the mating surface, the contact between the first surface and the mating surface and the electrolyte is reduced, which helps to further reduce the swelling degree of the portion of the sealing part close to the mating surface, thereby helping to improve the sealing effect of the seal.

[0018] In some implementations of the present application, along the axial direction of the injection hole, the sealing portion includes adjacent first diameter segment and second diameter segment, the first diameter segment is located in the inner cavity of the injection hole, the end face of one end of the first diameter segment close to the inner cavity of the shell is the first surface, the second diameter segment is located on the side of the first diameter segment close to the inner cavity of the shell, the circumferential outer contour of the second diameter segment is smaller than the circumferential outer contour of the first diameter segment, so that the barrier portion is sealed in cooperation with the installation space enclosed by the circumferential outer surface of the first surface and the second diameter segment.

[0019] By making the barrier part seal with the installation space and reducing the space between the barrier part and the sealing part, it is helpful to reduce the situation where the electrolyte enters the sealing part through the space between the barrier part and the sealing part, and it is helpful to improve the durability of the sealing part.

[0020] In some implementations of the present application, a mounting groove is formed on the sealing portion, the depth direction of the mounting groove is radial to the injection hole and points to the central axis of the injection hole, the blocking portion is arranged in the mounting groove and seals with the mounting groove, and the end face of the mounting groove at one end along the axial direction of the injection hole is the first surface.

[0021] By making the barrier part arrange the sealing part in the installation groove, it is helpful to improve the stability of the barrier part installed on the sealing part. In addition, by making the barrier part and the installation groove seal and reduce the space between the barrier part and the sealing part, it is helpful to reduce the situation that the electrolyte enters the sealing part through the space between the barrier part and the sealing part, and it is helpful to improve the durability of the sealing part.

[0022] In some implementations of the present application, the length of the mating surface is the same as the length of the injection hole, and the barrier portion includes a second fitting surface, which fits the circumferential outer surface of the sealing portion and is combined with the mating surface.

[0023] By making the mating surface longer, the sealing effect of the sealing part is improved. Moreover, by making the second fitting surface fit with the circumferential outer surface of the sealing part and combined with the mating surface, the contact between the mating surface and the surface of the sealing part located on the side of the mating surface close to the injection hole and the electrolyte is reduced, thereby further reducing the swelling degree of the part of the sealing part close to the mating surface, thereby improving the sealing effect of the seal.

[0024] In some implementations of the present application, the barrier portion extends along the circumference of the liquid injection hole to form a peripheral structure, so that the barrier portion blocks the communication between a peripheral seam and the inner cavity of the shell.

[0025] By making the barrier portion block the connection between the surrounding seam and the inner cavity of the shell, the barrier portion blocks the electrolyte in a larger range, which is beneficial to improving the durability of the sealing portion.

[0026] 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.

[0027] By making the sealing part more flexible, the matching surface can fit tightly with the circumferential surface of the injection hole, which is beneficial to improving the sealing effect of the sealing part.

[0028] In some implementations of the present application, the sealing portion is made of a rubber material.

[0029] By making the sealing part out of rubber material, the sealing part has lower cost and greater flexibility, and can achieve a better sealing effect.

[0030] In some implementations of the present application, the barrier portion is made of plastic material.

[0031] By making the barrier part out of plastic material, the barrier part has a lower cost and a smaller swelling degree in the electrolyte, and can play a better effect of isolating the electrolyte.

[0032] 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 an injection hole; a sealing portion is arranged in the injection hole, and a mating surface is sealingly matched with a circumferential surface of the injection hole; along the axial direction of the injection hole, a barrier portion is arranged on a side of the shell cavity of the battery cell where the mating surface faces the circumferential surface of the injection hole, and the barrier portion is combined with the circumferential surface of the injection hole to block the connection between the joint between the mating surface and the circumferential surface of the injection hole and the inner cavity of the shell.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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

[0038] 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:

[0039] Figure 1 is a cross-sectional view of a top cover without a seal installed in some embodiments of the present application;

[0040] Figure 2 One of the cross-sectional views of a top cover with a seal installed in some embodiments of the present application;

[0041] Figure 3 This is one of the structural schematic diagrams of the sealing member in some embodiments of the present application;

[0042] Figure 4 This is the second structural schematic diagram of the sealing member in some embodiments of the present application;

[0043] Figure 5 One of the cross-sectional views of the sealing member in some embodiments of the present application;

[0044] Figure 6 This is one of the structural schematic diagrams of the sealing portion in some embodiments of the present application;

[0045] Figure 7 This is one of the structural schematic diagrams of the barrier portion in some embodiments of the present application;

[0046] Figure 8 The second cross-sectional view of the top cover with the sealing member installed in some embodiments of the present application;

[0047] Fig. 9 The third cross-sectional view of the top cover with the sealing member installed in some embodiments of the present application;

[0048] Fig.10 This is the second structural schematic diagram of the sealing portion in some embodiments of the present application;

[0049] Fig.11 This is a second structural schematic diagram of the barrier portion in some embodiments of the present application;

[0050] Fig.12 This is the third structural schematic diagram of the sealing member in some embodiments of the present application;

[0051] Fig.13 This is a fourth cross-sectional view of a top cover for installing a seal in some embodiments of the present application.

[0052] Description of reference numerals:

[0053] 01-end cover; 011-injection hole; 0111-circumferential surface of the injection hole; 1-sealing part; 11-first diameter section; 111-matching surface; 112-first surface; 12-second diameter section; 13-mounting groove; 131-bottom surface of the mounting groove; 14-third diameter section; 2-barrier part; 21-first fitting surface; 22-second fitting surface; a-first direction; b-radial direction of the injection hole; c-length of the injection hole; d-length of the matching surface; e-length of the barrier part. DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] Below, this application is described in detail.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 includes a sealing portion and a blocking portion. The sealing portion is used to be arranged in the liquid injection hole of the battery cell, and the sealing portion includes a mating surface, and the mating surface is used to seal and match with the circumferential surface of the liquid injection hole; the swelling degree of the material of the blocking portion in the electrolyte of the battery cell is less than that of the material of the sealing portion; the blocking portion is fixedly connected to the sealing portion; along the axial direction of the liquid injection hole, the blocking portion is arranged on the side of the mating surface that faces the inner cavity of the shell of the battery cell, and the blocking portion is used to combine with the circumferential surface of the liquid injection hole to block the connection between the joint between the mating surface and the circumferential surface of the liquid injection hole and the inner cavity of the shell. By providing a barrier portion having a swelling degree less than that of the sealing portion in the electrolyte, the barrier portion blocks the connection between the joint between the mating surface and the circumferential surface of the injection hole and the inner cavity of the shell, which is beneficial to reducing the contact between the portion of the sealing portion close to the mating surface and the electrolyte, thereby helping to reduce the volume increase of this portion due to swelling, and further helping to reduce the excessive force between the mating surface 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, the sealing component has high durability and is not easily damaged, which is beneficial to improving the sealing effect.

[0067] The sealing member for the liquid injection hole of the battery cell provided in the present application is suitable for use on the battery cell. Specifically, the present application further provides a battery cell, which comprises a shell and a sealing member for the liquid injection hole of the battery cell, wherein the shell has the liquid injection hole; a sealing portion is arranged in the liquid injection hole, and a mating surface is sealed and matched with a circumferential surface of the liquid injection hole; along the axial direction of the liquid injection hole, a barrier portion is arranged on a side of the inner cavity of the shell of the battery cell where the mating surface faces the inner cavity of the shell, and the barrier portion is combined with the circumferential surface of the liquid injection hole to block the connection between the joint between the mating surface and the circumferential surface of the liquid injection hole and the inner cavity of the shell.

[0068] 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.

[0069] 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.

[0070] The present application also 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.

[0071] 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.

[0072] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0073] Please refer to Figure 1 and Figure 2 During the process of installing the sealing member on the injection hole 011, the sealing member 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. The sealing member of the battery cell injection hole includes a sealing portion 1 and a blocking portion 2. The sealing part 1 is used to be arranged in the injection hole 011 of the battery cell, and the sealing part 1 includes a mating surface 111, and the mating surface 111 is used to seal and cooperate with the circumferential surface 0111 of the injection hole; the material used to make the barrier part 2 has a lower swelling degree in the electrolyte of the battery cell than the material used to make the sealing part 1; the barrier part 2 is fixedly connected to the sealing part 1; along the axial direction of the injection hole 011, the barrier part 2 is arranged on the side of the mating surface 111 facing the inner cavity of the outer shell of the battery cell, and the barrier part 2 is used to combine with the circumferential surface 0111 of the injection hole to block the connection between the joint between the mating surface 111 and the circumferential surface 0111 of the injection hole and the inner cavity of the outer shell.

[0074] Generally, please refer to Figure 1 and Figure 2 , the 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, etc. Generally, the shell includes an end cap 01 and a shell, and the shell is provided with an opening, and 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, and 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.

[0075] The mating surface 111 in the embodiment of the present application extends along the circumference of the injection hole 011 , and the mating surface 111 is located in the inner cavity of the injection hole 011 , and the entirety of the mating surface 111 is in sealing contact with the entirety or part of the circumferential surface 0111 of the injection hole.

[0076] 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.

[0077] 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.

[0078] The seam in the embodiment of the present application is formed by the portion of the circumferential surface 0111 of the injection hole that is sealed with the mating surface 111 and the mating surface 111, and the seam is located between the mating surface 111 and the circumferential surface 0111 of the injection hole along the radial direction b of the injection hole.

[0079] In the embodiment of the present application, along the axial direction of the injection hole 011, the barrier portion 2 is arranged on the side of the mating surface 111 facing the inner cavity of the shell of the battery cell, so that when the seal is installed on the injection hole 011, along the axial direction of the injection hole 011, the barrier portion 2 is located on the side of the seam facing the inner cavity of the battery cell. It should be explained that along the axial direction of the injection hole 011, the barrier portion 2 is arranged on the side of the mating surface 111 facing the inner cavity of the shell of the battery cell, that is, along the axial direction of the injection hole 011, the barrier portion 2 is closer to the inner cavity of the shell than the mating surface 111, and the barrier portion 2 is flush with the mating surface 111 in the circumferential direction of the injection hole 011.

[0080] The barrier part 2 in the embodiment of the present application is used to combine with the circumferential surface 0111 of the injection hole to block the connection between the joint between the matching surface 111 and the circumferential surface 0111 of the injection hole and the inner cavity of the shell, that is, the portion of the barrier part 2 used to combine with the circumferential surface 0111 of the injection hole is flush with the matching surface 111 in the radial direction b of the injection hole. In the circumferential surface 0111 of the injection hole, the portion combined with the barrier part 2 is closer to the inner cavity of the shell relative to the matching surface 111 along the axial direction of the injection hole 011, and is flush with the matching surface 111 in the circumferential direction of the injection hole 011, that is, it is directly opposite to the matching surface 111 in the axial direction of the injection hole 011, so that the barrier part 2 blocks the side of the joint along the axial direction of the injection hole 011 facing the inner cavity of the battery cell.

[0081] By setting the barrier part 2 whose swelling degree in the electrolyte is smaller than that of the sealing part 1, the barrier part 2 blocks the connection between the joint between the mating surface 111 and the circumferential surface 0111 of the injection hole and the inner cavity of the shell, which is beneficial to reducing the contact between the part of the sealing part 1 close to the mating surface 111 and the electrolyte, thereby helping to reduce the volume increase of this part due to swelling, and further helping to reduce the excessive force between the mating surface 111 and the circumferential surface 0111 of the injection hole due to the increase in volume, so that the sealing part 1 is not easily crushed by the circumferential surface 0111 of the injection hole, the sealing component has high durability and is not easy to be damaged, which is beneficial to improving the sealing effect.

[0082] In some embodiments of this application, please refer to Figure 2 In the axial direction of the injection hole 011, the length of the sealing part 1 is greater than the length of the injection hole 011. In this way, when the sealing member is installed on the injection hole 011, the sealing part 1 will extend into the inner cavity of the shell, which is beneficial to improve the sealing effect of the injection hole 011.

[0083] In some embodiments of this application, please refer to Figure 3 to Figure 7 , Figure 3 to Figure 7 Belong to the same embodiment. Figure 3 and Figure 4 The seals are shown in two different perspectives. Figure 4 and Figure 7 The first direction is perpendicular to the paper surface and points inward. The barrier portion 2 extends along the circumference of the injection hole 011 to form a peripheral structure, so that the barrier portion 2 blocks the communication between a peripheral seam and the inner cavity of the shell.

[0084] In the embodiment of the present application, the matching surface 111 extends along the circumference of the liquid injection hole 011 to form a peripheral structure to form a peripheral seam with the circumferential surface 0111 of the liquid injection hole.

[0085] By making the barrier part 2 block the connection between the circumferential seam and the inner cavity of the shell, the barrier part 2 blocks the electrolyte in a larger range, which is beneficial to improving the durability of the sealing part 1.

[0086] In some embodiments of this application, please refer to Figure 3 to Figure 7 The barrier part 2 is an annular structure, the annular structure is coaxial with the injection hole 011, and the annular structure is sleeved on the sealing part 1. Such a structural form is convenient for processing and manufacturing of the sealing part.

[0087] In some embodiments of this application, please refer to Figure 2 and Figure 8 In the axial direction of the injection hole 011, the mating surface 111 and the injection hole 011 have a length difference; along the radial direction b of the injection hole, the barrier part 2 is used to be supported between the circumferential surface 0111 of the injection hole and the circumferential outer surface of the sealing part 1, so as to be combined with the circumferential surface 0111 of the injection hole to block the connection between the joint and the inner cavity of the shell.

[0088] The length d of the mating surface, the length c of the injection hole, and the length d of the barrier portion in the embodiment of the present application refer to the lengths when the seal is installed in the injection hole 011 and the battery cell can work normally, which can be measured by a vernier caliper or a micrometer screw.

[0089] In the embodiment of the present application, along the radial direction b of the injection hole, the barrier portion 2 is used to be supported between the circumferential surface 0111 of the injection hole and the circumferential outer surface of the sealing portion 1, that is, along the radial direction b of the injection hole, the barrier portion 2 is located between the circumferential surface 0111 of the injection hole and the circumferential outer surface of the sealing portion 1, and the end surface of one end of the barrier portion 2 applies a first force radially outward along the injection hole 011 to the circumferential surface 0111 of the injection hole, and the end surface of the other end of the barrier portion 2 applies a second force radially inward along the injection hole 011 to the circumferential outer surface of the sealing portion 1, and the first force is balanced with the second force.

[0090] In the embodiment of the present application, along the radial direction b of the liquid injection hole, the portion of the barrier portion 2 supported on the circumferential surface 0111 of the liquid injection hole is also the portion where the barrier portion 2 is combined with the liquid injection hole 011 .

[0091] The barrier part 2 in the embodiment of the present application and the circumferential surface 0111 of the injection hole are supported radially along the injection hole 011, and can also produce a certain sealing effect on the injection hole 011, but the sealing effect of the barrier part 2 on the injection hole 011 is less than the sealing effect of the sealing part 1 on the injection hole 011. Generally, the sealing fit between the mating surface 111 and the circumferential surface 0111 of the injection hole is relatively tight relative to the barrier part 2. In some embodiments of the present application, 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 flexibility of the sealing part 1 larger, the mating surface 111 can fit tightly with the circumferential surface 0111 of the injection hole, which is conducive to improving the sealing effect of the sealing part 1. In some embodiments of the present application, the sealing part 1 is made of rubber material. By making the sealing part 1 made of rubber material, the cost is low and the flexibility is large, which can achieve a better sealing effect. In some embodiments of the present application, the barrier part 2 is made of plastic material. By making the barrier part 2 out of plastic material, the cost is low and the swelling degree in the electrolyte is small, so it can play a better effect of blocking the electrolyte. Moreover, when supported by the circumferential surface 0111 of the injection hole, it can also play a better sealing role for the injection hole 011.

[0092] By supporting the barrier part 2 between the circumferential surface 0111 of the injection hole and the circumferential outer surface of the sealing part 1 along the radial direction b of the injection hole, the action force between the barrier part 2 and the circumferential surface 0111 of the injection hole is stronger, which is beneficial to make the barrier part 2 and the circumferential surface 0111 of the injection hole combine more closely, thereby helping to improve the effect of the barrier part 2 in blocking the electrolyte.

[0093] In some embodiments of this application, please refer to Figure 2 and Figure 8 The sum of the length of the supporting portion of the barrier portion 2 and the circumferential surface 0111 of the injection hole in the axial direction of the injection hole 011 and the spacing between the supporting portion and the matching surface 111 in the axial direction of the injection hole 011 is equal to the length difference.

[0094] The supporting portion of the barrier portion 2 and the circumferential surface 0111 of the injection hole in the embodiment of the present application is the surface of the barrier portion 2 that seals with the circumferential surface 0111 of the injection hole, and the surface is coplanar with the mating surface 111 .

[0095] In the embodiment of the present application, in the axial direction of the injection hole 011, the sum of the spacing between the support part and the mating surface 111 and the length of the support part is equal to the length difference, that is, in the axial direction of the injection hole 011, the sum of the spacing between the support part and the mating surface 111, the length d of the mating surface and the length of the support part is equal to the axial length of the injection hole 011, so that when the seal is installed on the injection hole 011, along the axial direction of the injection hole 011, the end of the mating surface 111 away from the barrier part 2 is combined with the edge of the end of the injection hole 011 away from the inner cavity of the shell, and the end of the barrier part 2 away from the mating surface 111 is combined with the edge of the end of the injection hole 011 close to the inner cavity of the shell, that is, it is supported outwardly along the radial direction b of the injection hole on the edge of the end of the injection hole 011 close to the inner cavity of the shell.

[0096] The distance between the supporting portion and the mating surface 111 in the embodiment of the present application may be zero, but may also be non-zero.

[0097] By making the length d of the barrier portion longer, the barrier portion 2 can be directly combined 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 effect of blocking the electrolyte. The barrier portion 2 is directly combined with the edge of the end of the injection hole 011 close to the inner cavity of the shell, that is, along the radial direction b of the injection hole, the sealing portion 1 is supported on the edge of the end of the injection hole 011 close to the inner cavity of the shell through the barrier portion 2, so that the sealing portion 1 is not easily affected by the stress concentration effect generated by the edge of the end of the injection hole 011 close to the inner cavity of the shell, which is conducive to improving the stress condition of the sealing portion 1 and improving the durability of the sealing component.

[0098] In some embodiments of this application, please refer to Figure 2 and Figure 8 , in the axial direction of the injection hole 011, the distance between the barrier part 2 and the matching surface 111 is greater than or equal to the length d of the barrier part. For such a structural form, please refer to Figure 8By making the distance between the barrier part 2 and the mating surface 111 in the axial direction of the injection hole 011 and the length d of the barrier part greater than the length difference, when the seal is installed on the injection hole 011, along the axial direction of the injection hole 011, the barrier part 2 extends from the end of the sealing part 1 to the side of the injection hole 011 close to the inner cavity of the shell, which is conducive to improving the effect of the barrier part 2 in blocking the electrolyte. Please refer to Figure 2 By making the distance between the barrier portion 2 and the matching surface 111 and the length d of the barrier portion in the axial direction of the injection hole 011 equal to the length difference, it is beneficial to save materials.

[0099] In some embodiments of this application, please refer to Figure 2 and Figure 8 In the axial direction of the injection hole 011, the length d of the mating surface is equal to 0.5 to 0.7 times the length c of the injection hole. For example, in some embodiments of the present application, the length d of the mating surface is equal to 0.5, 0.6 or 0.7 of the length c of the injection hole.

[0100] By making the length d of the matching surface longer, that is, the contact area between the sealing portion 1 and the circumferential surface 0111 of the liquid injection hole is larger, it is beneficial to improve the sealing effect of the sealing portion 1.

[0101] In some embodiments of this application, please refer to Figure 2 , Figure 8 , Fig. 9 and Fig.13 The blocking portion 2 is combined with the matching surface 111 to block the connection between the seam and the inner cavity of the shell.

[0102] In the embodiment of the present application, the barrier portion 2 is combined with the mating surface 111, that is, the distance between the barrier portion 2 and the mating surface 111 along the axial direction of the injection hole 011 is zero. In the axial direction of the injection hole 011, the sum of the distance between the barrier portion 2 and the mating surface 111 and the length d of the barrier portion is the length d of the barrier portion.

[0103] In the embodiment of the present application, it can be understood that, along the radial direction b of the injection hole, when the barrier part 2 is supported between the circumferential surface 0111 of the injection hole and the circumferential outer surface of the sealing part 1, the barrier part 2 is combined with the mating surface 111, that is, the part of the barrier part 2 supported by the circumferential surface 0111 of the injection hole is combined with the mating surface 111 at one end along the axial direction of the injection hole 011.

[0104] In the embodiment of the present application, it can be understood that when the length d of the mating surface is the same as the length c of the injection hole, the barrier portion 2 will be located in the inner cavity of the shell. In this case, the barrier portion 2 is combined with the mating surface 111, that is, the barrier portion 2 is combined with the edge of the injection hole 011 at one end close to the inner cavity of the shell.

[0105] By combining the barrier part 2 with the matching surface 111 , the barrier part 2 and the matching surface 111 are relatively close, which is beneficial to improving the barrier effect of the barrier part 2 on the seam.

[0106] In some embodiments of this application, please refer to Figure 2 , Figure 8 and Fig. 9 The outer surface of the sealing portion 1 includes a first surface 112, which is located in the inner cavity of the injection hole 011. The first surface 112 has an angle with the axial direction of the injection hole 011, and the first surface 112 is combined with the matching surface 111; the barrier portion 2 includes a first fitting surface 21, which is fitted with the first surface 112 and combined with the matching surface 111.

[0107] In the embodiment of the present application, the axial size of the first surface 112 and the injection hole 011 can be realized in various forms. The first surface 112 can be perpendicular to the axial direction of the injection hole 011, or the first surface 112 can be not perpendicular to the axial direction of the injection hole 011.

[0108] In the embodiment of the present application, the first surface 112 faces the inner cavity of the liquid injection hole 011 .

[0109] In the embodiment of the present application, the first surface 112 is combined with the matching surface 111. It can be understood that the end of the first surface 112 radially away from the central axis of the injection hole 011 is combined with the end of the matching surface 111 close to the inner cavity of the shell.

[0110] By making the first fitting surface 21 of the barrier part 2 fit with the first surface 112 and combined with the mating surface 111, it is helpful to reduce the contact between the first surface 112 and the mating surface 111 and the electrolyte, thereby helping to further reduce the swelling degree of the portion of the sealing part 1 close to the mating surface 111, and further helping to improve the sealing effect of the seal.

[0111] In some embodiments of this application, please refer to Fig. 9 , the first surface 112 is perpendicular to the axial direction of the injection hole 011, and the first surface 112 is coplanar with the end surface of the injection hole 011 close to the inner cavity of the shell. With such a structural form, the length d of the mating surface is longer, which means that the contact area between the sealing part 1 and the circumferential surface 0111 of the injection hole is larger, which is beneficial to improve the sealing effect of the sealing part 1. For example, in some embodiments of the present application, the length d of the mating surface can be the same as the length c of the injection hole. Of course, in some embodiments of the present application, refer to Figure 2 and Figure 8 The first surface 112 may also have a distance from the end surface of the injection hole 011 close to the inner cavity of the shell.

[0112] In some embodiments of this application, please refer to Figure 2 , Figure 8 and Fig. 9 Along the axial direction of the injection hole 011, the sealing portion 1 includes an adjacent first diameter section 11 and a second diameter section 12. The first diameter section 11 is located in the inner cavity of the injection hole 011. The end surface of the first diameter section 11 close to the inner cavity of the shell is a first surface 112. The second diameter section 12 is located on the side of the first diameter section 11 close to the inner cavity of the shell. The circumferential outer contour of the second diameter section 12 is smaller than the circumferential outer contour of the first diameter section 11, so that the first surface 112 and the circumferential outer surface of the second diameter section 12 enclose an installation space, and the barrier portion 2 is sealed and matched with the installation space.

[0113] In the embodiment of the present application, the first diameter section 11 and the second diameter section 12 are arranged adjacent to each other along the axial direction of the injection hole 011 . Both the first diameter section 11 and the second diameter section 12 are shaft-like structures, and the axial direction is the same as that of the injection hole 011 .

[0114] The mating surface 111 in the embodiment of the present application is formed on the circumferential outer surface of the first diameter section 11 .

[0115] In the embodiment of the present application, along the radial direction b of the injection hole, the barrier part 2 is used to be supported between the circumferential surface 0111 of the injection hole and the circumferential outer surface of the sealing part 1, and the portion of the circumferential outer surface of the sealing part 1 that is radially supported by the barrier part 2 along the injection hole 011 is formed on the circumferential surface of the second diameter section 12.

[0116] By making the barrier part 2 seal with the installation space and reducing the space between the barrier part 2 and the sealing part 1, it is beneficial to reduce the situation where the electrolyte enters the sealing part 1 through the space between the barrier part 2 and the sealing part 1, and it is beneficial to improve the durability of the sealing part 1.

[0117] In some embodiments of this application, please refer to Figure 2 , Figure 8 and Fig. 9 A mounting groove 13 is formed on the sealing portion 1, the depth direction of the mounting groove 13 is the radial direction b of the injection hole, and points to the central axis of the injection hole 011, the blocking portion 2 is arranged in the mounting groove 13, and is sealed with the mounting groove 13, and the end face of one end of the mounting groove 13 along the axial direction of the injection hole 011 is the first surface 112.

[0118] In the embodiment of the present application, the bottom surface 131 of the mounting groove is also the circumferential surface of the second diameter section 12 .

[0119] In the embodiment of the present application, the sealing portion 1 also includes a third diameter section 14. Along the axial direction of the injection hole 011, the third diameter section 14 is located on the side of the second diameter section 12 away from the first diameter section 11. The circumferential outer contour of the third diameter section 14 is larger than the circumferential outer contour of the second diameter section 12. The portion of the third diameter section 14 protruding radially relative to the second diameter section 12 and the portion of the first diameter section 11 protruding radially relative to the second diameter section 12 are opposite to each other along the axial direction of the injection hole 011, so that the end face of the first diameter section 11 close to one end of the second diameter section 12, the end face of the third diameter section 14 close to one end of the second diameter section 12 and the circumferential surface of the second diameter section 12 together enclose a mounting groove 13.

[0120] In the embodiment of the present application, along the radial direction b of the injection hole, the edge of the injection hole 011 at one end close to the inner cavity of the shell may be flush with the first surface 112, so that the length d of the mating surface is longer, which is beneficial to improving the sealing effect; the edge of the injection hole 011 at one end close to the inner cavity of the shell may be located between the first diameter section 11 and the third diameter section 14, which is beneficial to reduce the stress concentration caused by the edge of the injection hole 011 at one end close to the inner cavity of the shell on the sealing part 1; the edge of the injection hole 011 at one end close to the inner cavity of the shell may be flush with the end face of the third diameter section 14 at one end close to the second diameter section 12.

[0121] By making the barrier part 2 arrange the sealing part 1 in the installation groove 13, it is helpful to improve the stability of the barrier part 2 installed on the sealing part 1. In addition, by making the barrier part 2 and the installation groove 13 seal and match, the gap between the barrier part 2 and the sealing part 1 is reduced, which is helpful to reduce the situation that the electrolyte enters the sealing part 1 through the gap between the barrier part 2 and the sealing part 1, and it is helpful to improve the durability of the sealing part 1.

[0122] In some embodiments of this application, please refer to Figure 10 to Figure 13 , Figure 10 to Figure 13 The length d of the matching surface is the same as the length c of the injection hole. The barrier portion 2 includes a second fitting surface 22 , which fits the circumferential outer surface of the sealing portion 1 and is combined with the matching surface 111 .

[0123] By making the mating surface 111 longer, it is helpful to improve the sealing effect of the sealing part 1. Moreover, by making the second fitting surface 22 fit the circumferential outer surface of the sealing part 1 and combine with the fitting surface 111, it is helpful to reduce the contact between the fitting surface 111 and the surface of the sealing part 1 located on the side of the fitting surface 111 close to the injection hole 011 and the electrolyte, so as to further reduce the swelling degree of the part of the sealing part 1 close to the fitting surface 111, and further improve the sealing effect of the seal.

[0124] In some embodiments of this application, please refer to Figure 10 to Figure 13, the second fitting surface 22 is parallel to the axial direction of the injection hole 011. Such a structural form facilitates the installation of the seal and is also conducive to improving the barrier effect of the barrier part 2. Of course, in some other embodiments of the present application, the second fitting surface 22 may not be parallel to the axial direction of the injection hole 011.

[0125] 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 portion, used to be arranged in the liquid injection hole of the battery core, the sealing portion comprising a matching surface, and the matching surface is used to seal and cooperate with the circumferential surface of the liquid injection hole; A barrier portion, wherein the material of the barrier portion has a lower swelling degree in the electrolyte of the battery cell than the material of the sealing portion; The blocking portion is fixedly connected to the sealing portion; along the axial direction of the injection hole, the blocking portion is arranged on the side of the matching surface facing the inner cavity of the shell of the battery cell, and the blocking portion is used to combine with the circumferential surface of the injection hole to block the connection between the joint between the matching surface and the circumferential surface of the injection hole and the inner cavity of the shell.

2. The sealing member for the battery cell injection hole according to claim 1, characterized in that: In the axial direction of the injection hole, the mating surface and the injection hole have a length difference; along the radial direction of the injection hole, the blocking portion is used to be supported between the circumferential surface of the injection hole and the circumferential outer surface of the sealing portion, so as to be combined with the circumferential surface of the injection hole to block the connection between the seam and the inner cavity of the shell.

3. The sealing member for the battery cell injection hole according to claim 2, characterized in that: The sum of the length of the blocking portion and the supporting portion of the circumferential surface of the injection hole in the axial direction of the injection hole and the distance between the supporting portion and the matching surface in the axial direction of the injection hole is equal to the length difference.

4. The sealing member for the battery cell injection hole according to claim 3, characterized in that: In the axial direction of the injection hole, the distance between the blocking portion and the matching surface and the length of the blocking portion are greater than or equal to the length difference.

5. The sealing member for the battery cell injection hole according to claim 3, characterized in that: In the axial direction of the injection hole, the length of the matching surface is equal to 0.5 to 0.7 times the length of the injection hole.

6. The sealing member for the battery cell injection hole according to claim 4, characterized in that: In the axial direction of the injection hole, the length of the matching surface is equal to 0.5 to 0.7 times the length of the injection hole.

7. The sealing member for the battery cell liquid injection hole according to any one of claims 1 to 6, characterized in that: The blocking portion is combined with the matching surface to block the communication between the seam and the inner cavity of the shell.

8. The sealing member for the battery cell injection hole according to claim 7, characterized in that: The outer surface of the sealing portion includes a first surface, the first surface is located in the inner cavity of the injection hole, the first surface has an angle with the axial direction of the injection hole, and the first surface is combined with the matching surface; the blocking portion includes a first fitting surface, the first fitting surface is fitted with the first surface and combined with the matching surface.

9. The sealing member for the battery cell injection hole according to claim 8, characterized in that: Along the axial direction of the injection hole, the sealing portion includes an adjacent first diameter segment and a second diameter segment, the first diameter segment is located in the inner cavity of the injection hole, the end surface of one end of the first diameter segment close to the inner cavity of the shell is the first surface, the second diameter segment is located on the side of the first diameter segment close to the inner cavity of the shell, the circumferential outer contour of the second diameter segment is smaller than the circumferential outer contour of the first diameter segment, so that the first surface and the circumferential outer surface of the second diameter segment enclose an installation space, and the barrier portion is sealed in cooperation with the installation space.

10. The sealing member for the battery cell liquid injection hole according to claim 8, characterized in that: A mounting groove is formed on the sealing portion, the depth direction of the mounting groove is the radial direction of the injection hole and points to the central axis of the injection hole, the blocking portion is arranged in the mounting groove and is sealed with the mounting groove, and the end face of one end of the mounting groove along the axial direction of the injection hole is the first surface.

11. The sealing member for the battery cell liquid injection hole according to claim 7, characterized in that: The length of the matching surface is the same as the length of the injection hole. The blocking portion includes a second fitting surface, which fits the circumferential outer surface of the sealing portion and is combined with the matching surface.

12. The sealing member for the battery cell liquid injection hole according to any one of claims 1 to 6, characterized in that: The blocking portion extends along the circumference of the liquid injection hole to form a circumferential structure, so that the blocking portion blocks the communication between the seam and the inner cavity of the shell for one circumference.

13. The sealing member for the battery cell liquid injection hole according to any one of claims 1 to 6, characterized in that: In the radial direction of the liquid injection hole, the sealing portion has greater flexibility than the blocking portion.

14. The sealing member for the battery cell liquid injection hole according to any one of claims 1 to 6, characterized in that: The sealing part is made of rubber material.

15. The sealing member for the battery cell liquid injection hole according to any one of claims 1 to 6, characterized in that: The blocking part is made of plastic material.

16. A battery cell, characterized in that: include: A housing having a liquid injection hole; The sealing member for a liquid injection hole of a battery cell according to any one of claims 1 to 15, wherein the sealing portion is arranged in the liquid injection hole, and the mating surface is sealingly matched with the circumferential surface of the liquid injection hole; along the axial direction of the liquid injection hole, the blocking portion is arranged on the side of the mating surface facing the inner cavity of the shell of the battery cell, and the blocking portion is combined with the circumferential surface of the liquid injection hole to block the connection between the joint between the mating surface and the circumferential surface of the liquid injection hole and the inner cavity of the shell.

17. A battery, characterized in that: Including the battery cell as described in claim 16, 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.

18. An electrical equipment, characterized in that: include: Electricity-consuming entity; The battery as claimed in claim 17 is used to supply power to the power-consuming entity.

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