Battery cell, battery device, and electric device

Abstract

The application relates to a battery monomer, a battery device and an electric equipment. The battery monomer comprises a shell with a containing cavity and a liquid injection hole; an electrode assembly arranged in the containing cavity; and a valve assembly arranged in the containing cavity and comprising a valve body and a one-way valve core. The valve body has a liquid injection channel in the inside. The liquid injection channel has a first section and a second section which are communicated with each other. The first section is communicated with the liquid injection hole, and the second section is arranged intersectingly with the first section. The one-way valve core is movably arranged in the second section and has a closing position for closing the liquid injection channel and an opening position for one-way opening the liquid injection channel along the liquid injection direction. The valve assembly can form a buffering effect on electrolyte and reduce the impact force of the electrolyte during liquid injection. The one-way valve core can realize one-way opening of the liquid injection channel along the liquid injection direction during liquid injection, and the liquid injection channel is closed after the liquid injection is completed, so that the electrolyte is effectively prevented from overflowing from the containing cavity.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0002] A battery cell is the smallest unit that makes up a battery device. During the production process of a battery cell, electrolyte needs to be injected into the cell. However, due to various factors, electrolyte overflow can easily occur during injection, meaning that the electrolyte flows back from the inside of the battery cell to the outside, contaminating the cell and affecting production efficiency and battery cell performance. Utility Model Content

[0003] Therefore, it is necessary to provide a battery cell, battery device, and electrical equipment to address the problem that electrolyte overflow during electrolyte injection can easily contaminate battery cells, thereby affecting production efficiency and battery cell performance.

[0004] In a first aspect, this application provides a battery cell, including a housing, an electrode assembly, and a valve assembly. The housing has a receiving cavity and an injection hole communicating with the receiving cavity. The electrode assembly is disposed within the receiving cavity. The valve assembly is disposed within the receiving cavity and includes a valve body and a one-way valve core. The valve body has an injection channel inside, and the injection channel has a first section and a second section communicating with each other. The first section communicates with the injection hole, and the second section intersects with the first section. The one-way valve core is movably disposed in the second section and has a closed position for closing the injection channel and an open position for unidirectionally opening the injection channel along the injection direction.

[0005] Through the above structure, on the one hand, when the electrolyte flows within the injection channel, it is guided and redirected by the first and second sections, which provides a buffering effect, reducing the impact force during injection and better protecting the structure of the electrode assembly. On the other hand, the one-way valve core allows the injection channel to open unidirectionally along the injection direction during injection, ensuring smooth injection, and closes the injection channel after injection is complete, effectively preventing electrolyte from overflowing from the containment cavity, maintaining the cleanliness of the battery cells, and improving production efficiency and battery cell performance.

[0006] In some embodiments, the first segment is coaxially arranged with the injection hole, and the axial direction of the second segment is perpendicular to the axial direction of the first segment.

[0007] Through the above structure, the first and second sections can cooperate with each other to guide the electrolyte and buffer it during the process of the electrolyte entering the containment cavity, thereby reducing the impact of the electrolyte on the electrode assembly and protecting the structure of the electrode assembly.

[0008] In some embodiments, the one-way valve core includes a movable member and an opening / closing member disposed on the movable member. The movable member is rotatably disposed within the second section to switch between a closed position and an open position.

[0009] In the closed position, the opening and closing element blocks the second section; in the open position, the opening and closing element and the valve body form a flow gap connecting the second section and the receiving cavity.

[0010] With the above structure, the one-way valve core can switch between the closed and open positions by rotation, so that the one-way valve core can smoothly open the liquid injection channel during liquid injection and close the liquid injection channel in time after liquid injection is completed, reducing the probability of electrolyte overflow.

[0011] In some embodiments, the top of the movable member is rotatably connected to the valve body along the direction of gravity, and the one-way valve core is configured to return from the open position to the closed position under its own gravity.

[0012] With the above structure, after the electrolyte injection is completed, the one-way valve core can close the electrolyte injection channel in time under its own gravity, reducing the probability of electrolyte overflow inside the battery cell.

[0013] In some embodiments, the valve assembly further includes an elastic element connected between the one-way valve spool and the valve body, the elastic element being used to provide the elastic force for the one-way valve spool to return from the open position to the closed position.

[0014] With the above structure, after the electrolyte injection is completed, the one-way valve core can close the electrolyte injection channel in time under the tension of the spring, reducing the probability of electrolyte overflow inside the battery cell.

[0015] In some embodiments, a limiting step protrudes from the inner wall of the second segment; in the closed position, the opening and closing element abuts against the limiting step in the opposite direction of the injection direction; in the open position, a flow gap is formed between the opening and closing element and the limiting step.

[0016] The above structure enables smooth switching of the one-way valve core between the closed and open positions, thereby facilitating electrolyte injection and timely closure of the injection channel after injection, reducing the probability of electrolyte overflow.

[0017] In some embodiments, the opening and closing member includes a main body and a vent portion disposed on the main body, the main body being fixedly connected to the movable member; in the closed position, the vent portion blocks the second section; in the open position, a flow gap is formed between the vent portion and the valve body.

[0018] Therefore, by setting up a main body and a venting part, the one-way valve core can be smoothly switched between the closed and open positions. In addition, the venting part can also vent the battery cells in the closed position, which can better balance the air pressure inside the battery cells.

[0019] In some embodiments, the main body and the movable part are detachably connected. This detachable connection allows for flexible replacement of the opening / closing element or the movable part, better ensuring the sealing effect of the opening / closing element within the injection channel.

[0020] In some embodiments, the breathable portion is configured as a waterproof and breathable membrane. This results in a waterproof and breathable membrane with good breathability, flexibility, and temperature resistance, while effectively preventing liquid penetration.

[0021] Secondly, this application also provides a battery device, including the battery cell as described above.

[0022] Thirdly, this application also provides an electrical device, including the battery device described above.

[0023] The aforementioned battery cells, battery devices, and electrical equipment, through the installation of a valve assembly connected to the injection port, allow the electrolyte to sequentially pass through the injection port and the valve assembly during injection, ultimately reaching the receiving cavity. During this process, the electrolyte first enters the first section of the injection channel connected to the injection port. As it flows from the first section to the second section, the intersecting extension directions of the first and second sections provide a buffering effect, reducing the impact force on the electrolyte during injection. Furthermore, the pressure of the flowing electrolyte can open the one-way valve core along the injection direction, enabling one-way opening of the injection channel for smooth injection. In the event of overflow, the one-way valve core closes the injection channel, preventing electrolyte from flowing out, maintaining the cleanliness of the battery cells, and improving production efficiency and battery cell performance. Attached Figure Description

[0024] Figure 1 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0025] Figure 2 This is a partial structural diagram of the casing in a battery cell according to one or more embodiments.

[0026] Figure 3 This is a partial structural diagram of the casing in a battery cell according to one or more embodiments.

[0027] Figure 4 This is a partial structural diagram of the casing in a battery cell according to one or more embodiments.

[0028] Figure 5 for Figure 4 Sectional view along the AA direction.

[0029] Figure 6 for Figure 5 A magnified view of the one-way valve core at point B in the open position.

[0030] Figure 7 for Figure 5 A magnified view of point B when the check valve core is in the closed position.

[0031] Figure 8 This is a schematic diagram of the structure of a one-way valve core in a battery cell according to one or more embodiments.

[0032] Explanation of reference numerals in the attached drawings: 100, battery cell; 10, casing; 20, electrode assembly; 30, valve assembly; 11, receiving cavity; 12, injection port; 31, valve body; 32, one-way valve core; 33, injection channel; 321, moving part; 322, opening and closing part; 323, flow gap; 324, main body; 325, vent; 331, first section; 332, second section; 333, limiting step. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0039] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as other fields. With the continuous expansion of the application areas of battery devices, the market demand is also constantly increasing.

[0040] A battery cell is the smallest unit that makes up a battery device. A battery cell typically includes a housing and an electrode assembly. The housing typically includes a casing and a top cover. The top cover is a sealing cover located at the opening of the casing, and the top cover and the casing together enclose a cavity in which the electrode assembly is placed.

[0041] Furthermore, the manufacturing process of a battery cell involves sequential steps such as venting and electrolyte injection. Venting involves placing the battery cell in a high-temperature, vacuum environment to bake it, allowing the moisture in the electrode components housed within the containment cavity to evaporate and drain out through the electrolyte injection hole on the top cover of the battery cell. After venting, the battery cell needs to be injected with electrolyte, that is, electrolyte is injected into the containment cavity.

[0042] During the electrolyte filling process, various factors can easily lead to electrolyte overflow, which is the backflow of electrolyte from the inside of the battery cell to the outside. For example, if the designed electrolyte filling volume of the battery cell is too high, or if the electrolyte absorption capacity of the electrode assembly is poor, or if the battery cell is impacted by external structures such as the production line, electrolyte overflow can occur. When electrolyte overflow occurs, it can easily contaminate the battery cell and affect production efficiency and battery cell performance.

[0043] Based on the above considerations, to address the problem of electrolyte overflow during injection, which contaminates battery cells and affects production efficiency and battery cell performance, one or more embodiments of this application provide a battery cell that, through a valve assembly connected to the injection hole, allows the electrolyte to pass sequentially through the injection hole and the valve assembly before reaching the receiving cavity. During this process, the electrolyte first enters the first section of the injection channel connected to the injection hole. As it flows from the first section to the second section, the intersecting extension directions of the first and second sections provide a buffering effect, reducing the impact force on the electrolyte during injection. Furthermore, the pressure of the flowing electrolyte can open a one-way valve core along the injection direction, enabling unidirectional opening of the injection channel for smooth injection. When overflow occurs, the one-way valve core closes the injection channel, preventing electrolyte outflow, maintaining the cleanliness of the battery cell, and improving production efficiency and battery cell performance.

[0044] It should be noted that the battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0045] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0046] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0047] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0048] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0049] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 as well as Figure 6 This application provides a battery cell 100, including a housing 10, an electrode assembly 20, and a valve assembly 30. The housing 10 has a receiving cavity 11 and an injection hole 12 communicating with the receiving cavity 11. The electrode assembly 20 is disposed within the receiving cavity 11. The valve assembly 30 is disposed within the receiving cavity 11 and includes a valve body 31 and a one-way valve core 32. The valve body 31 has an injection channel 33 inside, which has a first segment 331 and a second segment 332 communicating with each other. The first segment 331 communicates with the injection hole 12, and the second segment 332 intersects with the first segment 331. The one-way valve core 32 is movably disposed in the second segment 332 and has a closed position for closing the injection channel 33 and an open position for unidirectionally opening the injection channel 33 along the injection direction.

[0050] It should be noted that the outer casing 10 refers to a structure that provides housing space and protection for the electrode assembly 20 and other functional components. The outer casing 10 may include a top cover and a housing, one end of which has an opening. The top cover is sealed at the opening, so that the housing and the top cover together enclose and form a housing cavity 11.

[0051] An electrolyte injection hole 12 is provided on the outer casing 10. The position of the electrolyte injection hole 12 can be adjusted according to actual needs. For example, the electrolyte injection hole 12 can be provided on the top cover, that is, the electrolyte injection hole 12 is provided through the thickness direction of the top cover and communicates with the receiving cavity 11. Of course, the electrolyte injection hole 12 can also be provided on the casing, and can also be provided through the thickness direction of the wall to communicate with the receiving cavity 11. In this way, electrolyte can be injected into the receiving cavity 11 of the battery cell 100 through the electrolyte injection hole 12.

[0052] For ease of understanding, the following explanation will use the example of the injection hole 12 being located on the top cover. That is, the injection hole 12 is provided through the top cover along its thickness direction and communicates with the receiving cavity 11.

[0053] Electrode assembly 20 refers to the component in battery cell 100 where the actual electrochemical reaction occurs. Electrode assembly 20 typically includes a positive electrode, a separator, and a negative electrode that are stacked or wound in layers. The electrode assembly 20 is placed in the receiving cavity 11, and electrolyte is injected into the receiving cavity 11 through the injection hole 12 so that the electrode assembly 20 can be fully wetted with electrolyte, thereby enabling the battery cell 100 to be recycled.

[0054] Valve assembly 30 refers to a structure that enables the injection process to proceed smoothly and isolates the receiving cavity 11 from the external environment upon completion of injection. Valve assembly 30 is disposed within the receiving cavity 11 and includes a valve body 31 and a one-way valve core 32. The valve body 31 serves as the main structure of valve assembly 30, and its interior is hollow to form an injection channel 33. The one-way valve core 32 is a component capable of closing the injection channel 33 and opening it in one direction.

[0055] Specifically, the injection channel 33 has a first segment 331 and a second segment 332 that are interconnected. The first segment 331 is connected to the injection hole 12 and extends along the axial direction of the injection hole 12. The second segment 332 extends in a direction that intersects the axial direction of the injection hole 12 and is connected to the receiving cavity 11. In other words, the injection channel 33 is configured as a curved channel, and the extending direction of the first segment 331 intersects the extending direction of the second segment 332.

[0056] Furthermore, the first segment 331 can be coaxially arranged with the injection hole 12, and the second segment 332 can extend in a direction perpendicular to the axial direction of the injection hole 12. That is, the first segment 331 extends along the thickness direction of the top cover, while the second segment 332 extends in a direction parallel to the top cover. Thus, the extension directions of the first segment 331 and the extension directions of the second segment 332 are perpendicular to each other.

[0057] It should be noted that during the injection process, the electrolyte enters the receiving cavity 11 from top to bottom through the injection hole 12. At this time, the electrolyte will exert a certain impact force on the electrode assembly 20 in the receiving cavity 11, which may easily affect the structure of the electrode assembly 20.

[0058] In this application, by setting the extension direction of the first segment 331 and the extension direction of the second segment 332 to be perpendicular to each other, during the injection, the electrolyte first flows down along the injection hole 12 to the first segment 331. During the process of flowing from the first segment 331 to the second segment 332, the flow direction of the electrolyte is changed by the influence of the second segment 332, which plays a buffering role on the electrolyte and can effectively reduce the impact force of the electrolyte.

[0059] Furthermore, the one-way valve core 32 is movably disposed in the second section 332. The one-way valve core 32 can be disposed within the second section 332 or movably disposed at the opening of the second section 332 that communicates with the receiving cavity 11.

[0060] The one-way valve core 32 has a closed position and an open position. During electrolyte injection, the electrolyte flows from the second section 332 to the receiving cavity 11. The one-way valve core 32 can switch from the closed position to the open position under the thrust or pressure of the electrolyte. At this time, the injection channel 33 is opened unidirectionally along the injection direction, and the electrolyte can flow smoothly into the receiving cavity 11. After the injection is completed, the one-way valve core 32 can return from the open position to the closed position under its own gravity or other external forces, thereby effectively preventing the electrolyte from overflowing from the receiving cavity 11.

[0061] Thus, through the above structure, on the one hand, when the electrolyte flows in the injection channel 33, it is guided by the first section 331 and the second section 332 and its direction is changed, which can form a certain buffering effect on the electrolyte, reduce the impact force of the electrolyte during injection, and better protect the structure of the electrode assembly 20. On the other hand, the one-way valve core 32 can open the injection channel 33 in one direction along the injection direction during injection to achieve smooth injection, and close the injection channel 33 after injection is completed, effectively preventing the electrolyte from overflowing from the receiving cavity 11, keeping the battery cell 100 clean, and improving production efficiency and the performance of the battery cell 100.

[0062] In some embodiments, the first segment 331 is coaxially arranged with the injection hole 12, and the axial direction of the second segment 332 is perpendicular to the axial direction of the first segment 331.

[0063] Specifically, the first segment 331 extends axially along the thickness direction of the top cover, and the first segment 331 is coaxially arranged with the injection hole 12, that is, the first segment 331 is connected to the lower part of the injection hole 12. The second segment 332 extends axially in a direction parallel to the top cover, that is, the axial direction of the second segment 332 is perpendicular to the axial direction of the first segment 331.

[0064] Furthermore, the number of second segments 332 can be set to one or more. When there are multiple second segments 332, each second segment 332 can be distributed circumferentially along the injection hole 12. In this way, when the electrolyte flows downward from the first segment 331 to the second segment 332, the electrolyte can be diverted, and each second segment 332 forms a branch, which then flows radially outward along the injection hole 12 and finally flows into the receiving cavity 11.

[0065] Through the above structure, the first segment 331 and the second segment 332 can cooperate with each other to guide the electrolyte and buffer it during the process of the electrolyte entering the receiving cavity 11, thereby reducing the impact of the electrolyte on the electrode assembly 20 and protecting the structure of the electrode assembly 20.

[0066] like Figure 6 and Figure 7As shown, in some embodiments, the one-way valve core 32 includes a movable member 321 and an opening / closing member 322 disposed on the movable member 321. The movable member 321 is rotatably disposed within the second segment 332 to switch between a closed position and an open position. In the closed position, the opening / closing member 322 blocks the second segment 332. In the open position, a flow gap 323 is formed between the opening / closing member 322 and the valve body 31, communicating between the second segment 332 and the receiving cavity 11.

[0067] Specifically, the movable component 321 is rotatably connected to the valve body 31, allowing the one-way valve core 32 to be rotatably mounted on the valve body 31. A rotating shaft can be provided on the valve body 31, with its axial direction intersecting the axial direction of the second segment 332. The movable component 321 is then rotatably mounted on the rotating shaft. In this way, the one-way valve core 32 can rotate around the rotating shaft, switching between a closed position and an open position during rotation.

[0068] Furthermore, when the axial direction of the second segment 332 extends along the length direction of the top cover, the axial direction of the rotating shaft can be set along the width direction of the top cover. And when the axial direction of the second segment 332 extends along the width direction of the top cover, the axial direction of the rotating shaft can be set along the length direction of the top cover.

[0069] In the closed position, the opening / closing element 322 can abut against the valve body 31 in the opposite direction of the injection direction under the action of gravity or other external forces. Thus, when electrolyte overflow occurs, the pressure from the electrolyte on the one-way valve core 32 is opposite to the direction of the abutment force of the valve body 31 against the one-way valve core 32, thereby keeping the one-way valve core 32 in the closed position and blocking the electrolyte through the one-way valve core 32.

[0070] During electrolyte injection, the electrolyte applies pressure to the one-way valve core 32 along the injection direction, causing the opening / closing element 322 to separate from the valve body 31, forming a flow gap 323 between them, allowing the electrolyte to pass through. At this time, the one-way valve core 32 switches from the closed position to the open position.

[0071] With the above structure, the one-way valve core 32 can switch between the closed position and the open position by rotation, so that the one-way valve core 32 can smoothly open the liquid injection channel 33 during liquid injection and close the liquid injection channel 33 in time after the liquid injection is completed, reducing the probability of electrolyte overflow.

[0072] In some embodiments, the movable element 321 is rotatably connected to the valve body 31 at its top end along the direction of gravity, and the one-way valve core 32 is configured to return from the open position to the closed position under its own gravity.

[0073] Specifically, the top of the movable part 321 is rotatably connected to the valve body 31 along the direction of gravity. During liquid injection, the electrolyte applies pressure to the one-way valve core 32 along the injection direction. Under the action of pressure, the movable part 321 and the opening and closing part 322 on it rotate around the rotating shaft along the injection direction, so that the opening and closing part 322 is separated from the valve body 31, thereby forming a flow gap 323 to realize the injection of electrolyte.

[0074] After the electrolyte injection is completed, the pressure of the electrolyte applied to the one-way valve core 32 disappears, and the moving part 321 and its opening and closing part 322 can abut against the valve body 31 again under the action of the one-way valve core 32's own gravity, thereby restoring the one-way valve core 32 from the open position to the closed position, thus blocking the overflow of electrolyte inside the battery cell 100.

[0075] Therefore, through the above structure, after the electrolyte injection is completed, the one-way valve core 32 can close the electrolyte injection channel 33 in time under its own gravity, reducing the probability of electrolyte overflow inside the battery cell 100.

[0076] In some embodiments, the valve assembly 30 further includes an elastic element (not shown) connected between the one-way valve core 32 and the valve body 31, the elastic element being used to provide the elastic force for the one-way valve core 32 to return from the open position to the closed position.

[0077] Specifically, the elastic element can be, but is not limited to, a spring, which is connected between the one-way valve core 32 and the valve body 31, so that the one-way valve core 32 can be restored from the open position to the closed position by the spring force.

[0078] Understandably, during electrolyte injection, the electrolyte applies pressure to the one-way valve core 32 along the injection direction. Under the action of pressure, the one-way valve core 32 overcomes the elastic force of the spring and rotates around the axis along the injection direction, causing the opening and closing element 322 to separate from the valve body 31, thereby forming a flow gap 323 and realizing the injection of electrolyte.

[0079] After the electrolyte injection is completed, the pressure of the electrolyte applied to the one-way valve core 32 disappears. Under the tension of the spring, the one-way valve core 32 causes the opening and closing part 322 to abut against the valve body 31 again, thereby restoring the one-way valve core 32 from the open position to the closed position, thus blocking the overflow of electrolyte inside the battery cell 100.

[0080] Therefore, through the above structure, after the electrolyte injection is completed, the one-way valve core 32 can close the electrolyte injection channel 33 in time under the tension of the spring, reducing the probability of electrolyte overflow inside the battery cell 100.

[0081] In some embodiments, a limiting step 333 protrudes from the inner wall of the second segment 332. In the closed position, the opening / closing member 322 abuts against the limiting step 333 in the opposite direction to the injection direction. In the open position, a flow gap 323 is formed between the opening / closing member 322 and the limiting step 333.

[0082] Specifically, a limiting step 333 can be formed by protruding circumferentially on the inner wall of the second section 332. In this way, the opening and closing member 322 can abut against the limiting step 333 in the opposite direction of the injection direction under its own weight or under the elastic force of the spring, thereby blocking the injection channel 33.

[0083] During electrolyte injection, the opening and closing element 322 rotates along the injection direction under the pressure of the electrolyte, thereby separating the opening and closing element 322 from the limiting step 333 to form a flow gap 323, allowing the electrolyte to pass through smoothly.

[0084] The above structure enables the one-way valve core 32 to switch smoothly between the closed and open positions, thereby achieving electrolyte injection and timely closure of the injection channel 33 after injection, reducing the probability of electrolyte overflow.

[0085] like Figure 6 and Figure 8 As shown, in some embodiments, the opening / closing member 322 includes a main body 324 and a vent 325 disposed on the main body 324, the main body 324 being fixedly connected to the movable member 321. In the closed position, the vent 325 blocks the second section 332. In the open position, a flow gap 323 is formed between the vent 325 and the valve body 31.

[0086] Specifically, the vent 325 refers to a structure that allows gas to pass through while blocking liquids or particles. The movable part 321 may, but is not limited to, be a rocker arm, one end of which is rotatably connected to the valve body 31, fixing the main body 324 to the rocker arm. In the closed position, the vent 325 abuts against the limiting step 333, blocking the second section 332 of the liquid injection channel 33. At this time, gas inside the battery cell 100 can be discharged through the vent 325, while simultaneously blocking the electrolyte inside the battery cell 100, reducing the probability of electrolyte overflow.

[0087] During injection, the electrolyte applies pressure to the vent 325 along the injection direction. The vent 325 rotates around the shaft under the action of the rocker arm and separates from the limiting step 333, forming a flow gap 323, which allows the electrolyte to pass through smoothly.

[0088] Therefore, by setting the main body 324 and the vent 325, the one-way valve core 32 can be smoothly switched between the closed position and the open position. In addition, the vent 325 can also vent the battery cell 100 in the closed position, which can better balance the air pressure inside the battery cell 100.

[0089] In some embodiments, the outline of the vent 325 matches the cross-sectional shape of the second segment 332 and is used to isolate the second segment 332 from the receiving cavity 11 in the closed position.

[0090] Specifically, the outline of the vent 325 matches the cross-sectional shape of the second segment 332. When the injection channel 33 is set as a circular channel, the cross-sectional shape of the second segment 332 is circular, and the vent 325 can be set as circular. When the injection channel 33 is set as a square channel, the cross-sectional shape of the second segment 332 is square, and the vent 325 can be set as square.

[0091] In this way, the vent 325 can better match the cross-sectional shape of the second section 332, thereby better sealing the injection channel 33 and achieving isolation between the injection channel 33 and the receiving cavity 11.

[0092] In some embodiments, the main body 324 is detachably connected to the movable member 321.

[0093] The detachable connection allows for flexible replacement of the opening and closing element 322 on the movable part 321, thus better ensuring the sealing effect of the opening and closing element 322 within the injection channel 33.

[0094] Specifically, a mounting hole can be made on the movable part 321, and the main body 324 can be set as a protrusion. The protrusion is inserted into the mounting hole, thereby realizing a detachable connection between the opening / closing part 322 and the movable part 321.

[0095] Of course, other detachable connection methods can also be used between the moving part 321 and the opening / closing part 322, such as by snap-fit ​​connection or by adhesive bonding, which will not be elaborated here.

[0096] The above structure allows for flexible replacement of the opening / closing element 322 or the movable element 321, making operation convenient and improving the practicality of the one-way valve core 32.

[0097] In some embodiments, the breathable portion 325 is configured as a waterproof and breathable membrane.

[0098] Specifically, the pore size of waterproof and breathable membranes is typically at the nanometer or micrometer level, allowing gas molecules to pass through while blocking liquids or particles. These membranes can be made from polymer materials such as polypropylene (PP), polyester (PET), and polyvinylidene chloride (PVDC).

[0099] This gives the waterproof and breathable membrane excellent breathability, flexibility, and temperature resistance, and it can effectively block liquid penetration.

[0100] Based on the same concept as the battery cell 100 described above, this application also provides a battery device including the battery cell 100 as described above.

[0101] Based on the same concept as the battery device described above, this application also provides an electrical device including the battery device described above.

[0102] According to one or more embodiments, when this application is used in a specific state, the opening and closing member 322 and the moving member 321 abut against the limiting step 333 inside the valve body 31 under their own gravity or under the elastic force of the spring. At this time, the venting part 325 blocks the liquid injection channel 33, and the liquid injection channel 33 is closed.

[0103] During injection, an external injection device is used to inject electrolyte into the injection hole 12. At this time, the electrolyte applies pressure to the vent 325 from the outside to the inside along the injection direction, causing the movable part 321 to drive the opening and closing part 322 to rotate around the shaft. The vent 325 and the limiting step 333 separate to form a flow gap 323, and the electrolyte smoothly enters the receiving cavity 11 through the flow gap 323.

[0104] After the electrolyte injection is completed, the pressure of the electrolyte applied to the vent 325 disappears, and the opening / closing element 322 and the moving element 321 return to the closed position under their own weight or the force of the spring. At this time, the gas inside the battery cell 100 can be discharged through the vent 325, and the vent 325 blocks the electrolyte, reducing the probability of electrolyte overflow.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized in that, include: The outer casing has a receiving cavity and an injection port communicating with the receiving cavity; The electrode assembly is disposed within the receiving cavity; and A valve assembly is disposed within the receiving cavity and includes a valve body and a one-way valve core. The valve body has an injection channel inside, and the injection channel has a first section and a second section that are interconnected. The first segment is connected to the injection hole, and the second segment is intersecting with the first segment; The one-way valve core is movably disposed in the second section and has a closed position for closing the injection channel and an open position for unidirectionally opening the injection channel along the injection direction.

2. The battery cell according to claim 1, characterized in that, The first segment is coaxially arranged with the injection hole, and the axial direction of the second segment is perpendicular to the axial direction of the first segment.

3. The battery cell according to claim 1, characterized in that, The one-way valve core includes a movable part and an opening / closing part disposed on the movable part. The movable part is rotatably disposed within the second section to switch between the closed position and the open position. In the closed position, the opening / closing element blocks the second section; in the open position, the opening / closing element and the valve body form a flow gap communicating between the second section and the receiving cavity.

4. The battery cell according to claim 3, characterized in that, The movable part is rotatably connected to the valve body at its top end along the direction of gravity, and the one-way valve core is configured to return from the open position to the closed position under its own gravity.

5. The battery cell according to claim 3, characterized in that, The valve assembly further includes an elastic element connected between the one-way valve core and the valve body, the elastic element being used to provide the elastic force for the one-way valve core to return from the open position to the closed position.

6. The battery cell according to claim 3, characterized in that, A limiting step protrudes from the inner wall of the second section; in the closed position, the opening and closing element abuts against the limiting step in the opposite direction of the injection direction; in the open position, the flow gap is formed between the opening and closing element and the limiting step.

7. The battery cell according to claim 3, characterized in that, The opening and closing component includes a main body and a ventilated part disposed on the main body, and the main body is fixedly connected to the movable component; In the closed position, the vent blocks the second section; in the open position, the vent and the valve body form the flow gap.

8. The battery cell according to claim 7, characterized in that, The main body and the movable part are detachably connected.

9. The battery cell according to claim 7, characterized in that, The breathable portion is constructed as a waterproof and breathable membrane.

10. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-9.

11. An electrical appliance, characterized in that, Includes the battery device as described in claim 10.

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