Battery cell, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. Each battery monomer comprises a shell and a liquid injection valve; the shell is provided with a containing cavity used for containing electrolyte, the shell is provided with a liquid injection hole, and the liquid injection hole is communicated with the containing cavity. The liquid injection valve is arranged at the liquid injection hole, a liquid injection channel is arranged on the liquid injection valve, the liquid injection channel is used for being connected with liquid injection equipment, and a valve hole communicated with the liquid injection channel is further formed in the liquid injection valve. Wherein the liquid injection valve can move in the axial direction of the liquid injection hole, so that the valve hole and the hole wall of the liquid injection hole are opposite and blocked, or the valve hole is moved to be communicated with the containing cavity. According to the structure, the convenience during liquid injection and the sealing performance of the shell are considered, and the liquid injection efficiency and the operation stability of the battery monomers are improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and energy storage systems, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, sodium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] At present, the battery cell injection process is relatively complicated, and the sealing performance and injection convenience of the injection assembly are poor, so the above-mentioned technical problems need to be improved. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can improve the sealing performance of the liquid injection component, while improving the convenience of the liquid injection process and improving the liquid injection efficiency.

[0005] In a first aspect, the present application provides a battery cell, including a shell and an injection valve. The shell has a receiving cavity for receiving electrolyte, and the shell is provided with an injection hole, which is connected to the receiving cavity. The injection valve is provided at the injection hole, and the injection valve is provided with an injection channel, which is used to connect the injection device, and the injection valve is also provided with a valve hole connected to the injection channel. Among them, the injection valve can move along the axial direction of the injection hole to make the valve hole opposite to the hole wall of the injection hole and block it or move the valve hole to communicate with the receiving cavity.

[0006] In the technical solution of the embodiment of the present application, a shell is provided to seal the electrode assembly, electrolyte and other components inside, so as to provide a stable environment for the operation of the electrode assembly. In addition, an injection hole is provided on the shell to facilitate the injection of electrolyte, as well as secondary injection after the electrolyte is reduced. In particular, an injection valve is provided on the injection hole, and the injection valve has an injection channel and a valve hole, and the injection valve is used to connect the electrolyte supply source. When electrolyte filling is required, the valve hole can be conveniently opened by moving the relative position between the injection valve and the shell, and the injection channel can be connected to the accommodating chamber inside the shell to achieve injection. After the injection is completed, the injection valve can be moved to block the valve hole to ensure the sealing of the accommodating chamber and improve the stability of the operating environment of the electrode assembly. The above structure takes into account the convenience during injection and the sealing performance of the shell, and improves the efficiency of injection and the stability of the operation of the battery cell.

[0007] In some embodiments, the injection valve is threadedly connected to the housing, the injection valve is provided with an external thread, and the wall of the injection hole is provided with an internal thread matching the external thread. In the above structure, by rotating the injection valve, the valve hole can be connected and blocked, and the injection channel can be opened and closed, which is convenient to operate, has high injection efficiency, and strong sealing performance.

[0008] In some embodiments, the injection valve includes a valve body and a limiting portion. The valve body includes a side wall and a bottom wall, which together enclose an injection channel, and the valve hole passes through the side wall. The limiting portion is formed by protruding outward along the circumference of the side wall, and the limiting portion is arranged at one end of the side wall away from the bottom wall. In the above structure, the valve hole is arranged on the side wall, and moving the side wall can quickly achieve the sealing and connection of the valve hole, thereby improving the efficiency of the injection valve adjustment. In addition, a limiting portion is provided to limit the movement of the valve body to reduce the risk of the valve body falling into the shell.

[0009] In some embodiments, the outer diameter of the side wall gradually decreases along the direction from the limit portion to the bottom wall to form a guide portion. The above technical solution provides a guide portion to guide the movement direction of the valve body into the injection hole, thereby improving the accuracy of the direction in which the valve body enters the injection hole.

[0010] In some embodiments, the number of valve holes is multiple, and the multiple valve holes are arranged at intervals along the circumference of the side wall. In the above technical solution, by setting multiple valve holes, the flow rate of the injected liquid is increased and the injection efficiency is improved.

[0011] In some embodiments, the injection valve further includes a valve cover, which is detachably connected to the side wall and arranged opposite to the bottom wall, and is used to close the injection channel. In the above structure, the injection channel is blocked by setting the valve cover, thereby reducing the risk of impurities entering the battery cell from the injection channel.

[0012] In some embodiments, a first annular seal is provided on the side of the side wall facing the injection hole wall, and a clearance hole is provided on the first seal, which is connected to the valve hole. In the above structure, the first seal is provided to improve the sealing between the valve body and the injection hole wall, and reduce the risk of electrolyte leakage or external impurities entering the battery cell.

[0013] In some embodiments, a second seal is provided on the wall of the injection hole, and the second seal is provided at one end of the injection hole close to the accommodating cavity. In the above structure, by providing the second seal, the sealing between the valve body and the wall of the injection hole is improved, and the risk of electrolyte leakage or external impurities entering the battery cell is reduced.

[0014] In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiment.

[0015] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0016] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the exploded structure of a battery according to an embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application;

[0021] Figure 4 This is a structural schematic diagram of the connected state of the injection valve of one embodiment of the present application;

[0022] Figure 5 This is a structural schematic diagram of a liquid injection valve in a closed state according to an embodiment of the present application;

[0023] Figure 6 This is a schematic diagram of the structure of a liquid injection valve according to an embodiment of the present application.

[0024] Detailed description of reference numerals:

[0025] 1. Vehicle; 2. Battery; 10. Electrode assembly; 20. Shell; 21. Liquid injection hole; 22. Accommodating chamber; 24. Pressure relief mechanism; 25. Electrode terminal; 30. End cover; 40. Shell; 3. Controller; 4. Motor; 5. Box; 51. First part; 52. Second part; 53. Accommodating space; 6. Liquid injection valve; 601. Liquid injection channel; 602. Valve hole; 603. External thread; 604. Valve body; 605. Limiting part; 606. Side wall; 607. Bottom wall; 608. Guide part; 609. Valve cover; 610. First sealing member; 611. Make way hole; 7. Battery cell. DETAILED DESCRIPTION

[0026] 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.

[0027] 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; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0028] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0029] 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.

[0030] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. 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.

[0031] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0032] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0033] 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.

[0034] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for one embodiment of the present application. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 2 is provided inside the vehicle 1, and the battery 2 may be provided at the bottom, head or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery 2 to power the motor 4, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0035] In some embodiments of the present application, the battery 2 can be used not only as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0036] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0037] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the exploded structure of a battery provided in one embodiment of the present application. The battery includes a box body 5 and a battery cell 7, and the battery cell is accommodated in the box body. The box body 5 is used to provide a storage space for the battery cell 6, and the box body 5 can adopt a variety of structures.

[0038] In some optional embodiments, the box body 5 includes a first part 51 and a second part 52 , the first part 51 and the second part 52 cover each other, and the first part 51 and the second part 52 jointly define an accommodating space 53 for accommodating the battery cell 7 .

[0039] In some embodiments, the box 5 can be used as part of the chassis structure of the vehicle 1. For example, part of the box 5 can become at least a part of the floor of the vehicle 1, or part of the box 5 can become at least a part of the cross beam and longitudinal beam of the vehicle 1.

[0040] In the battery 2, there can be multiple battery cells 7, and the multiple battery cells 7 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 7 are both connected in series and in parallel. The multiple battery cells 7 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 7 is accommodated in the box 5. Of course, the battery 2 can also be a battery module formed by connecting multiple battery cells 7 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 5. The battery 2 can also include other structures, for example, the battery 2 can also include a converging component for realizing the electrical connection between the multiple battery cells 7.

[0041] Each battery cell 7 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 7 may be cylindrical, flat, rectangular or in other shapes.

[0042] In some embodiments, the battery cells 7 are connected by busbars to realize series or parallel connection of the circuits. Exemplarily, the busbars include busbars, busbars, and the like.

[0043] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 7 provided in some embodiments of the present application. The battery cell 7 refers to the smallest unit that constitutes the battery 2. Figure 3 The battery cell 7 includes a housing 40, an electrode assembly 10 and other functional components.

[0044] The outer shell 40 may include an end cap 30 and a shell 20. The end cap 30 refers to a component that covers the opening of the shell 20 to isolate the internal environment of the battery cell 7 from the external environment. Without limitation, the shape of the end cap 30 may be adapted to the shape of the shell 20 to match the shell 20. Optionally, the end cap 30 may be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the end cap 30 is not easily deformed when squeezed or collided, so that the battery cell 7 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 25 may be provided on the end cap 30. The electrode terminal 25 can be used to be electrically connected to the electrode assembly 10 for outputting or inputting electrical energy of the battery cell 7.

[0045] In some embodiments, a pressure relief mechanism 24 for releasing the internal pressure when the internal pressure or temperature of the battery cell 7 reaches a threshold value may also be provided on the end cap 30. The material of the end cap 30 may also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application.

[0046] The housing 20 is a component used to cooperate with the end cap 30 to form the internal environment of the battery cell 7. The formed internal environment can be used to accommodate the electrode assembly 10, the electrolyte and other components. The housing 20 and the end cap 30 can be independent components, and an opening can be set on the housing 20, and the internal environment of the battery cell 7 is formed by covering the opening with the end cap 30.

[0047] The electrode assembly 10 is a component in the battery cell 7 where electrochemical reactions occur. One or more electrode assemblies 10 may be included in the housing 20. Multiple electrode assemblies 10 constitute an electrode unit. The electrode assembly 10 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 7, active ions (such as lithium ions) are embedded and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through. In some embodiments, the electrode assembly 10 also includes a separator, which is arranged between the positive electrode and the negative electrode.

[0048] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0049] In some embodiments, the battery cell 7 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application does not specifically limit the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid, and the liquid electrolyte is also called an electrolyte.

[0050] In some embodiments, the electrode assembly 10 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure. In some embodiments, the electrode assembly 10 is a laminated structure. In some embodiments, the shape of the electrode assembly 10 can be cylindrical, flat, or multi-prism, etc. In some embodiments, the electrode assembly 10 is provided with a pole ear, and the pole ear can lead the current from the electrode assembly 10. The pole ear includes a positive pole ear and a negative pole ear.

[0051] During the production of battery cells, the electrode assembly is placed in the shell and sealed, and then the shell is injected through the injection hole on the shell. After the battery cell has been running for a period of time, the electrode liquid is consumed by electrochemical reactions and evaporates to reduce its content, so secondary liquid replenishment is required. The traditional injection hole is sealed by a sealing structure, and the opening process is complicated; and the sealing structure is prone to aging and deformation, resulting in reduced sealing performance of the shell and reduced operating stability of the battery cell.

[0052] An embodiment of the present application provides a battery cell, in which an injection valve is arranged in the injection hole, and the injection valve has an injection channel and a valve hole, and the injection valve is used to connect the electrolyte supply source. When electrolyte filling is required, the valve hole can be conveniently opened by moving the relative position between the injection valve and the shell, and the injection channel can be connected with the accommodating chamber inside the shell to achieve injection. After the injection is completed, the injection valve can be moved to seal the valve hole to ensure the sealing of the accommodating chamber and improve the stability of the operating environment of the electrode assembly. The above structure takes into account the convenience of injection and the sealing performance of the shell, thereby improving the efficiency of injection and the stability of the battery cell operation.

[0053] The following is a detailed description of the battery cell of the embodiment of the present application in conjunction with the accompanying drawings. Figures 3 to 6 , Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application. Figure 4 This is a structural schematic diagram of the connected state of the injection valve of one embodiment of the present application. Figure 5 This is a structural schematic diagram of a liquid injection valve in a closed state according to an embodiment of the present application. Figure 6 This is a schematic diagram of the structure of a liquid injection valve according to an embodiment of the present application.

[0054] As shown in the figure, the battery cell 7 provided in the embodiment of the present application includes a shell 20 and a liquid injection valve 6. The shell 20 has a accommodating chamber 22 for accommodating electrolyte, and the shell 20 is provided with a liquid injection hole 21, and the liquid injection hole 21 is connected to the accommodating chamber 22. The liquid injection valve 6 is arranged at the liquid injection hole 21, and the liquid injection valve 6 is provided with a liquid injection channel 601, and the liquid injection channel 601 is used to connect the liquid injection equipment. The liquid injection valve 6 is also provided with a valve hole 602 connected to the liquid injection channel 601. Among them, the liquid injection valve 6 can move axially along the liquid injection hole 21 to make the valve hole 602 face the hole wall of the liquid injection hole 21 and block it or move the valve hole 602 to communicate with the accommodating chamber 22.

[0055] The injection valve 6 can be made of materials with certain structural strength and corrosion resistance, and can be made of copper, stainless steel, aluminum alloy, polymer material, ceramic and other materials. The shape of the injection valve 6 matches the shape of the injection hole 21. For example, the injection hole 21 is circular and the injection valve 6 is correspondingly set to a cylindrical structure to facilitate the installation and relative movement of the injection valve 6.

[0056] Furthermore, the injection valve 6 is sealed to the wall of the injection hole 21, and the outer wall 606 of the injection valve 6 is at least partially in contact with the wall of the injection hole 21. The blocking of the valve hole 602 means that the outlet of the valve hole 602 is completely blocked by the wall of the injection hole 21, and liquid or gas cannot pass through the opening of the valve hole 602 and cannot enter the injection hole 21. The valve hole 602 is connected, which means that the opening of the valve hole 602 is connected to the injection hole 21, and is connected to the interior of the accommodating chamber 22 through the injection hole 21, and liquid or gas can enter the injection hole 21 from the valve hole 602 and enter the accommodating chamber 22.

[0057] In the technical solution of the embodiment of the present application, a shell 20 is provided to seal the electrode assembly 10, the electrolyte and other components inside, and provide a stable environment for the operation of the electrode assembly 10. In addition, an injection hole 21 is provided on the shell 20 to facilitate the injection of the electrolyte, as well as the secondary injection after the electrolyte is reduced. In particular, an injection valve 6 is provided in the injection hole 21, and the injection valve 6 has an injection channel 601 and a valve hole 602, and the injection valve 6 is used to connect the electrolyte supply source. When electrolyte filling is required, by moving the relative position between the injection valve 6 and the shell 20, the valve hole 602 can be easily opened, and the injection channel 601 is connected to the accommodating chamber 22 inside the shell 20 to achieve injection. After the injection is completed, the injection valve 6 can be moved to block the valve hole 602 to ensure the sealing of the accommodating chamber 22 and improve the stability of the operating environment of the electrode assembly 10. The above structure takes into account the convenience of injection and the sealing performance of the shell 20, and improves the efficiency of injection and the stability of the operation of the battery cell 7.

[0058] In some optional embodiments, the injection hole 21 is provided in the end cover 30, and the injection valve 6 is correspondingly connected to the end cover 30. In other embodiments, the injection hole 21 is provided in the housing 20, and the injection valve 6 is correspondingly connected to the housing 20.

[0059] In some optional embodiments, the injection valve 6 moves relative to the housing 20 along the axial direction of the injection hole 21. The outer wall of the injection valve 6 is provided with a groove or a convex portion extending along the axial direction of the injection hole 21, and the hole wall of the injection hole 21 is provided with a convex portion or a groove matching the threshold value, and the injection valve 6 moves relative to the housing 20 through the above structure.

[0060] like Figure 6 As shown, in some embodiments of the present application, the injection valve 6 is threadedly connected to the housing 20, the injection valve 6 is provided with an external thread 603, and the wall of the injection hole 21 is provided with an internal thread matching the external thread 603. The external thread 603 of the injection valve 6 matches the internal thread of the wall of the injection hole 21, and by rotating the injection valve 6, the communication and blocking of the valve hole 602 can be easily achieved, thereby controlling the opening and closing of the injection channel 601, which is convenient and intuitive, and improves the efficiency of injection.

[0061] At the same time, the threaded connection has a high sealing performance. When the injection valve 6 is rotated into place, the external thread 603 fits tightly with the internal thread to form a sealing barrier, which can reduce the risk of electrolyte leakage and external impurities intrusion, and improve the stability and purity of the internal environment of the battery 2.

[0062] In some optional embodiments, the injection valve 6 includes a cylindrical body and an injection channel 601 formed in the body, and a valve hole 602 is formed at one end of the injection channel 601 close to the side wall 606. The above structure can guide the flow direction of the electrolyte through the injection channel 601.

[0063] like Figure 5 As shown, in some embodiments of the present application, the injection valve 6 includes a valve body 604 and a limiting portion 605. The valve body 604 includes a side wall 606 and a bottom wall 607, and the side wall 606 and the bottom wall 607 together enclose a liquid injection channel 601, and the valve hole 602 penetrates the side wall 606. The limiting portion 605 is formed by protruding outward along the circumference of the side wall 606, and the limiting portion 605 is arranged at one end of the side wall 606 away from the bottom wall 607.

[0064] In the above structure, the valve body 604 is composed of a side wall 606 and a bottom wall 607, which together enclose a liquid injection channel 601, and the valve hole 602 penetrates the side wall 606. Such a structure is easy to manufacture and is conducive to improving production efficiency. In addition, the limiting portion 605 is formed by protruding outward along the circumference of the side wall 606, and is located at the end of the side wall 606 away from the bottom wall 607, which increases the contact area between the liquid injection valve 6 and the shell 20 and improves the stability of the connection. At the same time, the limiting portion 605 can prevent the valve body 604 from excessively penetrating into the shell 20 during the movement process, reducing the risk of the valve body 604 falling into the shell 20. The smooth progress of the liquid injection process is ensured, and problems such as electrolyte leakage that may be caused by the valve body 604 falling off are avoided.

[0065] In some optional embodiments, the valve body 604 and the limiting portion 605 are made of the same material and are integrally formed.

[0066] like Figure 4 As shown, in some embodiments of the present application, along the direction from the limiting portion 605 to the bottom wall 607, the outer diameter of the side wall 606 gradually decreases to form a guide portion 608. When the valve body 604 enters the injection hole 21, the guide portion 608 can guide the valve body 604 to move in the correct direction, ensuring that the valve body 604 can smoothly and accurately dock with the injection hole 21. The accuracy of the injection operation is improved and the risk of leakage caused by improper operation is reduced.

[0067] In some embodiments of the present application, there are multiple valve holes 602, and the multiple valve holes 602 are arranged at intervals along the side wall 606. The design of multiple valve holes 602 further improves the injection efficiency. By increasing the number of valve holes 602, the total area of ​​the injection channel 601 can be increased, so that the electrolyte can flow into the battery 2 more quickly, thereby improving the injection efficiency.

[0068] In some embodiments of the present application, the injection valve 6 further includes a valve cover 609 , which is detachably connected to the side wall 606 and disposed opposite to the bottom wall 607 , and is used to close the injection channel 601 .

[0069] By setting the valve cover 609 to block the injection channel 601, the electrolyte is prevented from leaking when injection is not needed. At the same time, the risk of impurities entering the battery cell 7 from the injection channel 601 is reduced. Secondly, the detachable connection design between the valve cover 609 and the side wall 606 facilitates the maintenance and replacement of the injection valve 6. When the injection valve 6 needs to be cleaned or replaced, the valve cover 609 can be easily removed, the injection channel 601 can be thoroughly cleaned, or a new injection valve 6 can be replaced. This design not only improves production efficiency, but also reduces maintenance costs. The valve cover 609 is arranged opposite to the bottom wall 607 to ensure the closure of the injection channel 601. During the injection process, the valve cover 609 and the bottom wall 607 together form a closed space, so that the electrolyte can smoothly enter the battery 2 through the injection channel 601 without leakage.

[0070] like Figure 6 As shown, in some embodiments of the present application, a first annular sealing member 610 is provided on the side of the side wall 606 facing the injection hole 21 , and a clearance hole 611 is provided on the first sealing member 610 , which is connected to the valve hole 602 .

[0071] First, the annular first seal 610 can effectively fill the tiny gap between the valve body 604 and the wall of the injection hole 21, forming a reliable sealing barrier. It can prevent the electrolyte from leaking from the injection hole 21 under extreme conditions such as high pressure or high temperature, and can also effectively isolate the outside air and impurities to maintain the purity and stability of the battery 2. In addition, the clearance hole 611 provided on the first seal 610 is connected to the valve hole 602, ensuring the smooth flow of the injection channel 601. It not only ensures the convenience of the injection operation, but also improves the sealing effect between the injection valve 6 and the wall of the injection hole 21.

[0072] In some optional embodiments, the shape of the clearance hole 611 matches that of the valve hole 602. For example, the valve hole 602 and the clearance hole 611 can both be set to be circular, racetrack-shaped or square. The above structure can minimize the blocking effect of the clearance hole 611 on the liquid flow of the valve hole 602, thereby ensuring the injection efficiency.

[0073] In some optional embodiments, the first sealing member 610 is provided with a plurality of intersecting notches at positions corresponding to the valve hole 602, and the notches are continuous along the thickness direction of the first sealing member 610. During the liquid injection process, the pressure of the liquid can break through the notches of the first sealing member 610 and form a clearance hole 611 on the first sealing member 610. The above structure can improve the sealing effect of the first sealing member 610 and ensure that the liquid in the valve hole 602 flows out smoothly.

[0074] In some optional embodiments, the first sealing member 610 is made of a material with excellent elasticity and corrosion resistance to ensure that it can maintain good sealing performance during long-term use. For example, a sealing ring can be made of rubber, silicone, etc. and sleeved outside the valve body 604.

[0075] In some optional embodiments, the first sealing member 610 is in interference fit with the housing 20. The above structure can further fill the gap between the first sealing member 610 and the wall of the injection hole 21, thereby improving the sealing performance of the first sealing member 610.

[0076] In some embodiments of the present application, a second seal is provided on the wall of the injection hole 21, and the second seal is provided at one end of the injection hole 21 close to the accommodating chamber 22. Exemplarily, the second seal is a sealing layer provided around the wall of the injection hole 21, and the second seal can be formed by applying sealant or providing a sealing rubber ring.

[0077] When the valve body 604 is docked with the injection hole 21, the second seal can fit tightly with the corresponding part of the valve body 604 to form a sealing barrier. The electrolyte is prevented from passing through the leakage channel, and a high sealing performance can be maintained even under extreme conditions such as high pressure or high temperature. At the same time, the setting of the second seal also takes into account the actual situation during the production and use of the battery 2. During the production process of the battery 2, the injection hole 21 may be subject to certain wear or contamination, and the second seal can compensate for these potential risks to ensure that the sealing performance of the injection hole 21 is not affected. During the use of the battery 2, due to factors such as the circulation of the electrolyte and temperature changes, the pressure inside the battery 2 may change, and the second seal can withstand these pressure changes and maintain a stable sealing effect.

[0078] In some optional embodiments, the second sealing member is made of a material with excellent elasticity and corrosion resistance to ensure that it can maintain good sealing performance during long-term use. For example, a sealing ring can be made of rubber, silicone, etc. and sleeved outside the valve body 604.

[0079] In some optional embodiments, there is an interference fit between the second sealing member and the valve body 604. The above structure can further fill the gap between the second sealing member and the side wall 606 of the valve body 604, thereby improving the sealing performance of the second sealing member.

[0080] The embodiment of the present application provides a battery 2, which includes the battery cell 7 in the above embodiment. The embodiment of the present application also provides an electrical device, which includes the battery 2 in the above embodiment, and the battery 2 is used to provide electrical energy. The above battery 2 and the electrical device both include the battery cell 7 in the above embodiment, and the battery cell 7 is provided with a shell 20 to seal the electrode assembly 10, the electrolyte and other components inside, and provide a stable environment for the operation of the electrode assembly 10. In addition, an injection hole 21 is provided on the shell 20 to facilitate the injection of the electrolyte, and the secondary injection after the electrolyte is reduced. In particular, an injection valve 6 is provided in the injection hole 21, and the injection valve 6 has an injection channel 601 and a valve hole 602, and the injection valve 6 is used to connect the electrolyte supply source. When the electrolyte needs to be filled, by moving the relative position between the injection valve 6 and the shell 20, the valve hole 602 can be easily opened, and the injection channel 601 is connected to the accommodating chamber 22 inside the shell 20 to achieve injection. After the injection is completed, the injection valve 6 can be moved to seal the valve hole 602 to ensure the sealing of the accommodating chamber 22 and improve the stability of the operating environment of the electrode assembly 10. The above structure takes into account the convenience of injection and the sealing performance of the shell 20, improving the efficiency of injection and the stability of the battery cell 7.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been 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 battery cell (7), characterized in that: include: A housing (20) having a receiving cavity (22) for receiving electrolyte, the housing (20) being provided with a liquid injection hole (21), the liquid injection hole (21) being in communication with the receiving cavity (22); The liquid injection valve (6) is arranged on the liquid injection hole (21), the liquid injection valve (6) is provided with a liquid injection channel (601), the liquid injection channel (601) is used to connect to the liquid injection equipment, and the liquid injection valve (6) is also provided with a valve hole (602) connected to the liquid injection channel (601), The injection valve (6) is capable of moving axially along the injection hole (21) to align the valve hole (602) with the hole wall of the injection hole (21) and seal it, or to move the valve hole (602) to communicate with the accommodating cavity (22).

2. The battery cell (7) according to claim 1, characterized in that: The injection valve (6) is threadedly connected to the housing (20), the injection valve (6) is provided with an external thread (603), and the hole wall of the injection hole (21) is provided with an internal thread matching the external thread (603).

3. The battery cell (7) according to claim 1 or 2, characterized in that: The injection valve (6) comprises: The valve body (604) includes a side wall (606) and a bottom wall (607), wherein the side wall (606) and the bottom wall (607) together enclose the liquid injection channel (601), and the valve hole (602) penetrates the side wall (606). The limiting portion (605) is formed to protrude outwardly along the circumference of the side wall (606), and the limiting portion (605) is arranged at one end of the side wall (606) away from the bottom wall (607).

4. The battery cell (7) according to claim 3, characterized in that: Along the direction from the limiting portion (605) toward the bottom wall (607), the outer diameter of the side wall (606) gradually decreases to form a guide portion (608).

5. The battery cell (7) according to claim 3, characterized in that: There are multiple valve holes (602), and the multiple valve holes (602) are arranged at intervals along the circumferential direction of the side wall (606).

6. The battery cell (7) according to claim 3, characterized in that: The injection valve (6) further comprises a valve cover (609), wherein the valve cover (609) is detachably connected to the side wall (606) and is arranged opposite to the bottom wall (607), and the valve cover (609) is used to close the injection channel (601).

7. The battery cell (7) according to any one of claims 4 to 6, characterized in that: A first annular sealing member (610) is provided on one side of the side wall (606) facing the wall of the liquid injection hole (21), and a clearance hole (611) is provided on the first sealing member (610), and the clearance hole (611) is communicated with the valve hole (602).

8. The battery cell (7) according to any one of claims 4 to 6, characterized in that: A second sealing member is provided on the wall of the liquid injection hole (21), and the second sealing member is provided at one end of the liquid injection hole (21) close to the accommodating cavity (22).

9. A battery (2), characterized in that: The invention comprises a battery cell (7) as claimed in any one of claims 1 to 8.

10. An electrical device, characterized in that: The electrical device comprises the battery (2) as claimed in claim 9, and the battery (2) is used to provide electrical energy.

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