Liquid injection assembly, battery monomer, battery device and electric equipment

Abstract

The utility model relates to a liquid injection assembly, a battery cell, a battery device and electric equipment, the liquid injection assembly comprises: a main body part, the interior of the main body part is provided with a liquid injection channel, and the liquid injection channel is provided with a liquid injection port in butt joint with a liquid injection hole; the deformation part is arranged at one end, provided with the liquid injection port, of the main body part; and the deformation part is configured to be capable of deforming under the action of external force to communicate the liquid injection channel with the liquid injection hole when the liquid injection port is in butt joint with the liquid injection hole, and is reset to close the liquid injection channel when the liquid injection port is separated from the liquid injection hole. The deformation part can deform under the action of the abutting force, and liquid injection is smoothly achieved; after liquid injection is completed, the deformation part closes the liquid injection channel through self deformation; therefore, the residual electrolyte in the electrolyte injection channel can be blocked, the probability that the electrolyte pollutes the battery monomer is reduced, and the use performance of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a liquid injection assembly, a battery cell, a battery device, and an electrical device. Background Technology

[0002] During the production of battery cells, after the battery cells are assembled, electrolyte needs to be injected into the cell through the injection port to ensure that the electrode components are properly immersed in the electrolyte. When using an external injection device to inject electrolyte into the injection port, the device must be separated from the battery cell after injection, and the injection port must be sealed.

[0003] However, after the electrolyte injection is completed, during the separation process between the external electrolyte injection device and the battery cell, the residual electrolyte on the electrolyte injection device can easily contaminate the battery cell and affect its performance. Utility Model Content

[0004] Therefore, it is necessary to provide an electrolyte injection assembly, a battery cell, a battery device, and an electrical device to address the problem that residual electrolyte on the external electrolyte injection device can easily contaminate the battery cell and affect its performance during the separation process from the battery cell.

[0005] In a first aspect, this application provides a liquid injection assembly for injecting liquid into the liquid injection hole of a battery cell. The liquid injection assembly includes a main body and a deformation part. The main body has a liquid injection channel inside, and the liquid injection channel has a liquid injection port that connects with the liquid injection hole. The deformation part is disposed at the end of the main body where the liquid injection port is formed. The deformation part is configured to deform under the action of an external force when the liquid injection port connects with the liquid injection hole to connect the liquid injection channel and the liquid injection hole, and to reset to close the liquid injection channel when the liquid injection port separates from the liquid injection hole.

[0006] With the above structure, the deformation part can open or close the electrolyte injection channel by its own deformation. In this way, the electrolyte injection channel can be closed in time when the electrolyte injection is completed, which will block the residual electrolyte in the electrolyte injection channel, reduce the probability of electrolyte contamination of the battery cell, and improve the performance of the battery cell.

[0007] In some embodiments, the main body and the deformable part are integrally formed. By integrally forming the main body and the deformable part, the overall structural strength and sealing effect of the injection assembly can be effectively improved, making the injection process smoother.

[0008] In some embodiments, the deformable part includes a plurality of valve flaps, which are arranged sequentially along the circumference of the injection port; wherein each valve flap has a connecting end connected to the main body and a free end disposed opposite to the connecting end, and the free end of each valve flap extends toward the center of the injection port and overlaps with each other in a sealing manner.

[0009] With the above structure, the deformation part can open the injection channel by deforming the free end of each valve disc to achieve smooth injection, and close the injection channel in time after the injection is completed to reduce the probability of residual electrolyte flowing out of the injection channel.

[0010] In some embodiments, each valve disc is configured as a resilient valve disc.

[0011] Therefore, the electrolyte injection channel can be opened or closed in a timely manner by the elastic deformation of each valve disc, reducing the probability of electrolyte contamination of battery cells.

[0012] In some embodiments, the arc length of each valve disc gradually decreases from the connecting end to the free end in the circumferential direction of the injection port. This allows the shape of each valve disc to better fit the injection port and injection channel, thereby improving the sealing of the injection channel.

[0013] In some embodiments, the free end of each valve disc is configured to bend and deform from the outside of the injection channel to the inside of the injection channel under the action of an external force when the injection port is connected to the injection hole.

[0014] Therefore, each valve disc can smoothly open and close the injection channel through its own elastic deformation, thereby smoothly realizing the injection and blocking the residual electrolyte in the injection channel after the injection is completed.

[0015] In some embodiments, the thickness of each valve disc is no greater than 1 mm. Setting the thickness of each valve disc within the above range enables each valve disc to stably open outward under the pressure of compressed gas, thereby smoothly discharging residual electrolyte from the injection channel.

[0016] In some embodiments, the thickness of each valve disc is no greater than 0.5 mm. Furthermore, setting the thickness of each valve disc within the above range can further improve the stability of the valve disc opening outward by compressed gas, thereby smoothly discharging the residual electrolyte in the injection channel.

[0017] In some embodiments, the number of valve discs is set to an even number, and in the radial direction of the injection port, every two valve discs are arranged opposite each other to form a group; wherein, one of the valve discs in each group extends at its free end to form a first step portion, and the other extends at its free end to form a second step portion, and the first step portion and the second step portion overlap and seal each other along the axial direction of the injection channel.

[0018] The above structure utilizes a staggered overlapping method to achieve a sealed connection between the first and second steps, which effectively increases the sealing area between each valve disc and improves the sealing effect of each valve disc on the injection channel.

[0019] In some embodiments, the number of valve discs is set to an even number, and in the radial direction of the injection port, every two valve discs are arranged opposite each other to form a group; wherein, one of the valve discs in each group protrudes at the free end to form a convex portion, and the other is recessed at the free end to form a groove, and the convex portion and the groove are sealed and inserted in a direction perpendicular to the axial direction of the injection channel.

[0020] With the above structure, the protrusion and the groove can be connected in a sealed manner. When the deformed part is in a closed state, the protrusion and the groove can increase the mating distance between each valve disc, thereby increasing the sealing size and improving the sealing effect.

[0021] Secondly, this application also provides a battery cell that is injected with liquid through the liquid injection assembly described above. The battery cell includes a housing and an electrode assembly disposed inside the housing. The housing has an injection hole. The deformable part of the liquid injection assembly can press against the housing and deform under the pressure to connect the injection channel and the injection hole.

[0022] Thirdly, this application also provides a battery device, including the battery cell as described above.

[0023] Fourthly, this application also provides an electrical device, including the battery device described above.

[0024] The aforementioned electrolyte injection assembly, battery cell, battery device, and electrical equipment all feature a deformable part that can flexibly open or close the electrolyte injection channel through its own deformation. Specifically, during electrolyte injection, when the injection port aligns with the injection hole on the battery cell, for example, when the electrolyte injection assembly is pressed against the surface of the battery cell, the deformable part deforms under the pressure, thereby opening the electrolyte injection channel and allowing communication between the channel and the hole, thus facilitating successful electrolyte injection. After electrolyte injection is complete, when the electrolyte injection assembly separates from the battery cell, the deformable part, freed from external force due to the disappearance of the pressure between the battery cell and the assembly, closes the electrolyte injection channel through its own deformation. This effectively blocks residual electrolyte within the injection channel, reducing the probability of electrolyte contamination of the battery cell and improving the battery cell's performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a liquid injection assembly according to one or more embodiments, showing the liquid injection channel closed when injecting liquid into a battery cell.

[0026] Figure 2 This is a schematic diagram of the structure in which the injection channel is opened when the injection assembly injects liquid into a battery cell according to one or more embodiments.

[0027] Figure 3 This is a schematic diagram of the structure for closing the injection channel in an injection assembly according to one or more embodiments.

[0028] Figure 4 A schematic diagram of a structure for opening an injection channel in a liquid injection assembly according to one or more embodiments.

[0029] Figure 5 A top view of the deformation portion closing the injection channel in an injection assembly according to one or more embodiments.

[0030] Figure 6 A top view showing the opening of the injection channel in the deformed portion of the injection assembly according to one or more embodiments.

[0031] Figure 7 This is a partial structural schematic diagram of the valve disc in an injection assembly according to one or more embodiments.

[0032] Figure 8 This is a partial structural schematic diagram of the valve disc in an injection assembly according to one or more embodiments.

[0033] Figure 9 This is a partial structural schematic diagram of the valve disc in an injection assembly according to one or more embodiments.

[0034] Figure 10 This is a schematic diagram of the structure of a battery cell according to one or more embodiments.

[0035] Explanation of reference numerals in the attached drawings: 100, liquid injection assembly; 200, battery cell; 201, liquid injection hole; 202, outer casing; 10, main body; 20, deformable part; 11, liquid injection channel; 12, liquid injection port; 21, valve disc; 22, connecting end; 23, free end; 24, first step; 25, second step; 26, protrusion; 27, groove. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] During electrolyte injection, an external injection device is typically used to inject electrolyte into the receiving cavity through an injection port. That is, the injection nozzle of the injection device is connected to the injection port, and electrolyte is injected into the injection port through the injection nozzle.

[0046] After the electrolyte filling is complete, the filling device needs to be removed to separate the filling nozzle from the filling hole. During this process, the residual electrolyte in the filling nozzle can easily flow downwards under gravity and drip onto the surface of the battery cells, causing contamination and affecting their performance.

[0047] Based on the above considerations, to address the problem that residual electrolyte on the external electrolyte injection device can easily contaminate the battery cell during the separation process from the battery cell, affecting its performance, one or more embodiments of this application provide an electrolyte injection assembly. A deformable portion can flexibly switch between a closed and open state through its own deformation. Specifically, during electrolyte injection, when the electrolyte injection assembly is connected to the battery cell, for example, when the assembly is pressed against the surface of the battery cell, the deformable portion deforms under pressure, switching from a closed to an open state, thus connecting the injection channel and the injection hole for smooth electrolyte injection. After injection is complete, when the electrolyte injection assembly separates from the battery cell, the deformable portion, due to the loss of connection between the battery cell and the assembly, is no longer subject to external force and quickly returns from the open state to the closed state through its own deformation, closing the injection channel. This effectively blocks residual electrolyte in the injection channel, reducing the probability of electrolyte contamination of the battery cell and improving its performance.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0053] See Figure 1 , Figure 2 , Figure 3 as well as Figure 4One embodiment of this application provides a liquid injection assembly 100 for injecting liquid into the liquid injection hole 201 of a battery cell 200. The liquid injection assembly 100 includes a main body 10 and a deformation part 20. The main body 10 has a liquid injection channel 11 inside, and the liquid injection channel 11 has a liquid injection port 12 that is connected to a first end of the liquid injection hole 201. The deformation part 20 is disposed at the first end of the main body 10 where the liquid injection port 12 is formed. The deformation part 20 is configured to deform under the action of an external force when the liquid injection port 12 is connected to the liquid injection hole 201, so as to connect the liquid injection channel 11 and the liquid injection hole 201, and to reset to close the liquid injection channel 11 when the liquid injection port 12 is separated from the liquid injection hole 201.

[0054] It should be noted that the electrolyte injection assembly 100 refers to a structure that can inject electrolyte into the internal cavity of the battery cell 200 through the electrolyte injection hole 201 opened on the battery cell 200. After the electrolyte injection is completed, the electrolyte injection assembly 100 needs to be separated from the battery cell 200, and the electrolyte injection hole 201 on the battery cell 200 needs to be sealed to complete the manufacturing of the battery cell 200.

[0055] The electrolyte injection assembly 100 includes a main body 10 and a deformable part 20. An electrolyte injection channel 11 is formed inside the main body 10, extending vertically through the assembly. The electrolyte injection channel 11 has a first end and a second end arranged opposite each other in the vertical direction. The first end can be used to connect with an electrolyte injection hole 201, thus forming an electrolyte injection port 12 at the first end. That is, during electrolyte injection, the main body 10 is pressed against the top cover of the battery cell 200, and the first end of the electrolyte injection channel 11 is aligned with the electrolyte injection hole 201. Thus, the electrolyte injection port 12 connects with the electrolyte injection hole 201. When the electrolyte injection channel 11 is open, it can communicate with the electrolyte injection hole 201, thereby injecting electrolyte into the electrolyte injection hole 201.

[0056] Furthermore, the injection channel 11 also has a second end disposed opposite to the first end, which can be connected to the injection cup or other structure to provide electrolyte into the injection channel 11.

[0057] The deformable part 20 can deform under the action of external force, and recover to its initial state through its own deformation recovery force when the external force disappears.

[0058] Specifically, when the deformable part 20 is in its initial state, it blocks the injection channel 11, thus closing the injection channel 11 and preventing communication between the injection channel 11 and the injection hole 201. However, when the deformable part 20 deforms under external force, it opens the injection channel 11 and allows it to communicate with the injection hole 201.

[0059] During the electrolyte injection process, when the main body 10 presses against the top cover of the battery cell 200, the deformation part 20 deforms under the pressure between itself and the battery cell 200, connecting the injection channel 11 with the injection hole 201, thereby injecting electrolyte into the injection hole 201 through the injection channel 11. When the electrolyte injection is complete, the main body 10 is separated from the battery cell 200. At this time, the pressure on the deformation part 20 disappears, and the deformation part 20 returns to its initial state under its own deformation, thus closing the injection channel 11. Therefore, when the electrolyte injection is complete, the deformation part 20 promptly closes the injection channel 11, preventing residual electrolyte from dripping onto the battery cell 200, thus reducing the probability of electrolyte contamination of the battery cell 200 and improving the performance of the battery cell 200.

[0060] With the above structure, the deformation part 20 can open or close the liquid injection channel 11 by its own deformation. In this way, the liquid injection channel 11 can be closed in time when the liquid injection is completed, which forms a barrier against the residual electrolyte in the liquid injection channel 11, reduces the probability of electrolyte contamination of the battery cell 200, and improves the performance of the battery cell 200.

[0061] In some embodiments, the main body 10 and the deformable part 20 are integrally formed.

[0062] Specifically, the main body 10 and the deformable part 20 can be made of the same material so that they can be integrally molded.

[0063] By integrally molding the main body 10 and the deformation part 20, the overall structural strength and sealing effect of the liquid injection assembly 100 can be effectively improved, making the liquid injection process smoother.

[0064] like Figure 5 and Figure 6 As shown, in some embodiments, the deformable part 20 includes a plurality of valve flaps 21, which are arranged sequentially along the circumference of the injection port 12. Each valve flap 21 has a connecting end 22 connected to the main body 10 and a free end 23 disposed opposite to the connecting end 22. The free ends 23 of each valve flap 21 extend toward the center of the injection port 12 and overlap and seal with each other.

[0065] Specifically, the deformable part 20 can be configured as multiple valve flaps 21, wherein the valve flap 21 refers to a flap-shaped structure, and each valve flap 21 can approach or open with each other. When each valve flap 21 approaches with each other, the valve flaps 21 are sealed together, and the injection channel 11 is closed. When each valve flap 21 is opened with each other, a gap is formed between each valve flap 21, and the injection channel 11 is opened.

[0066] Each valve disc 21 is arranged sequentially along the circumference of the injection port 12, that is, each two adjacent valve discs 21 are tightly fitted together, so as to better seal the injection channel 11.

[0067] Each valve disc 21 has a connecting end 22 and a free end 23. The connecting end 22 is connected to the main body 10, and the free end 23 extends in a direction away from the connecting end 22.

[0068] In its natural state, the free ends 23 of each valve disc 21 are sealed and overlapped with each other, thus closing the injection channel 11. When the main body 10 presses against the top cover of the battery cell 200, the top cover also applies a counter-pressure to the free ends 23 of each valve disc 21. Under the action of the pressure, the free ends 23 of each valve disc 21 bend and deform toward the inside of the injection channel 11. At this time, the free ends 23 of each valve disc 21 separate from each other to form a gap, thereby opening the injection channel 11 and connecting it with the injection hole 201, thus realizing the injection.

[0069] When the electrolyte injection is complete, the electrolyte injection assembly 100 separates from the battery cell 200. At this time, the resistance pressure on the free ends 23 of each valve disc 21 disappears, and the free ends 23 of each valve disc 21 re-seal and overlap each other under their own deformation, thus closing the electrolyte injection channel 11. This allows for timely closure of the electrolyte injection channel 11, reducing the probability of residual electrolyte flowing out.

[0070] With the above structure, the deformation part 20 can open the liquid injection channel 11 by the deformation of the free end 23 of each valve disc 21 to achieve smooth liquid injection, and close the liquid injection channel 11 in time after the liquid injection is completed to reduce the probability of residual electrolyte flowing out of the liquid injection channel 11.

[0071] In some embodiments, each valve disc 21 is configured as a resilient valve disc.

[0072] Specifically, each valve disc 21 can be configured as an elastic valve disc, that is, each valve disc 21 is made of an elastic material. The material of each valve disc 21 can be, but is not limited to, rubber, silicone or other elastic materials.

[0073] Under normal conditions, each valve disc 21 remains in a sealed overlapping state due to its own elastic deformation, that is, in a closed state, and the injection channel 11 is closed.

[0074] During electrolyte injection, the free ends 23 of each valve disc 21 are pressed against the top cover of the battery cell 200. Under the pressure, each valve disc 21 undergoes elastic deformation, and the free ends 23 bend towards the inside of the injection channel 11, creating a gap between the valve discs 21, thereby opening the injection channel 11. At this time, electrolyte can be injected into the injection hole 201 through the injection channel 11.

[0075] After the electrolyte injection is completed, the electrolyte injection assembly 100 is removed. At this time, the resistance pressure on each valve disc 21 disappears, and each valve disc 21 returns to a sealed overlap under its own elastic deformation, thus closing the electrolyte injection channel 11. As a result, the deformable part 20 can block the residual electrolyte in the electrolyte injection channel 11, reducing the probability of electrolyte dripping onto the battery cell 200 and thus contaminating the battery cell 200.

[0076] Therefore, the opening and closing of the liquid injection channel 11 can be achieved by the elastic deformation of each valve disc 21, reducing the probability of electrolyte contamination of the battery cell 200.

[0077] In some embodiments, in the circumferential direction of the injection port 12, the arc length of each valve disc 21 gradually decreases from the connecting end 22 to the free end 23.

[0078] Specifically, the injection channel 11 is typically designed as a circular channel, and along the circumference of the injection channel 11, the arc length of each valve disc 21 gradually decreases from the connecting end 22 to the free end 23. In this way, the shape of each valve disc 21 can better fit the injection channel 11, thereby better sealing the injection channel 11.

[0079] In some embodiments, the free end 23 of each valve disc 21 is configured to bend and deform from the outside of the injection channel 11 to the inside of the injection channel 11 under the action of an external force when the injection port 12 is connected to the injection hole 201.

[0080] Specifically, when the injection channel 11 is closed, the free ends 23 of each valve disc 21 are sealed and overlapped with each other, and are located outside the injection channel 11. When injection is required, the free ends 23 of each valve disc 21 are pressed against the top cover of the battery cell 200, so that the free ends 23 of each valve disc 21 bend and deform towards the inside of the injection channel 11 under the action of the pressure. At this time, the valve discs 21 are spaced apart from each other, thereby opening the injection channel 11.

[0081] When the injection is completed, as the resistance pressure on each valve disc 21 disappears, the free end 23 of each valve disc 21 can return to its initial state through its own elastic restoring force, thereby closing the injection channel 11.

[0082] Therefore, each valve disc 21 can smoothly open and close the injection channel 11 through its own elastic deformation, thereby smoothly realizing the injection and blocking the residual electrolyte in the injection channel 11 after the injection is completed.

[0083] In some embodiments, the thickness of each valve disc 21 is no greater than 1 mm.

[0084] It should be noted that after the injection is completed, compressed gas can be introduced into the injection channel 11 to push each valve 21 outward and blow out the electrolyte remaining in the injection channel 11.

[0085] Specifically, during the process of removing residual electrolyte in the injection channel 11 by compressed gas, the thickness of the valve disc 21 will affect whether each valve disc 21 can be smoothly pushed outward by the compressed gas.

[0086] Therefore, by setting the thickness of each valve disc 21 within the above-mentioned range, each valve disc 21 can achieve stable outward opening under the pressure of compressed gas, thereby smoothly discharging the residual electrolyte in the injection channel 11.

[0087] As one specific embodiment, the thickness of each valve disc 21 may be set to, but is not limited to, 0.2mm, 0.4mm, 0.6mm, 0.8mm, or 1mm.

[0088] In some embodiments, the thickness of each valve disc 21 is no greater than 0.5 mm.

[0089] Furthermore, by setting the thickness of each valve disc 21 within the aforementioned range, the stability of each valve disc 21 opening outward by compressed gas can be further improved, thereby smoothly discharging the residual electrolyte in the injection channel 11.

[0090] As one specific embodiment, the thickness of each valve disc 21 may be set to, but is not limited to, 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm.

[0091] like Figure 7 As shown, in some embodiments, the number of valve discs 21 is set to an even number, and in the radial direction of the injection port 12, every two valve discs 21 are arranged opposite each other to form a group. In each group of valve discs 21, one extends from the free end 23 to form a first step portion 24, and the other extends from the free end 23 to form a second step portion 25. The first step portion 24 and the second step portion 25 are mutually sealingly overlapped along the axial direction of the injection channel 11.

[0092] Specifically, the number of valve discs 21 is set to an even number, so that each valve disc 21 can correspond one-to-one along the radial direction of the injection port 12, and two opposite valve discs 21 form a group.

[0093] Furthermore, the two valve discs 21 in each group are arranged opposite each other radially along the injection port 12. Then, in each group of valve discs 21, the free end 23 of one valve disc 21 is extended outward to form a first step portion 24, and the free end 23 of the other valve disc 21 is extended outward to form a second step portion 25, so that the first step portion 24 and the second step portion 25 can be sealed and overlapped with each other along the axial direction of the injection channel 11.

[0094] The first step portion 24 and the second step portion 25 are offset from each other along the axial direction of the injection port 12, so that the first step portion 24 can overlap the second step portion 25, or the second step portion 25 can overlap the first step portion 24. In this way, the first step portion 24 and the second step portion 25 can be sealed and overlapped with each other along the axial direction of the injection port 12, thereby closing the injection channel 11.

[0095] The above structure achieves a sealed connection between the first step 24 and the second step 25 by means of staggered overlapping, which can effectively increase the sealing area between each valve disc 21 and improve the sealing effect of each valve disc 21 on the injection channel 11.

[0096] like Figure 8 and Figure 9 As shown, in some embodiments, the number of valve discs 21 is set to an even number, and in the radial direction of the injection port 12, every two valve discs 21 are arranged opposite each other to form a group. In each group of valve discs 21, one of them protrudes at the free end 23 to form a protrusion 26, and the other protrudes at the free end 23 to form a groove 27. The protrusion 26 and the groove 27 are sealed and inserted in a direction perpendicular to the axial direction of the injection port 12.

[0097] Specifically, in each set of valve discs 21, the free end 23 of one valve disc 21 protrudes outward to form a convex portion 26, and the free end 23 of the other valve disc 21 is recessed inward to form a groove 27, with the shapes of the convex portion 26 and the groove 27 matching each other. In this way, when the deformable part 20 is in the closed state, each convex portion 26 can be inserted into the corresponding groove 27, increasing the mating distance between the valve discs 21, thereby increasing the sealing size.

[0098] Understandably, the specific shapes of the protrusion 26 and the groove 27 may be, but are not limited to, triangular, trapezoidal or other shapes.

[0099] With the above structure, the protrusion 26 and the groove 27 can be connected in a sealed manner. When the deformable part 20 is in the closed state, the protrusion 26 and the groove 27 can increase the mating distance between each valve disc 21, thereby increasing the sealing size and improving the sealing effect.

[0100] Please refer to the following: Figure 1 , Figure 2 as well as Figure 10Based on the same concept as the liquid injection assembly 100 described above, this application also provides a battery cell 200, which is injected with liquid through the liquid injection assembly 100 as described above. The battery cell 200 includes a housing 202 and an electrode assembly (not shown in the figure) disposed inside the housing 202. A liquid injection hole 201 is provided on the housing 202. The deformable portion 20 of the liquid injection assembly 100 can press against the housing 202 and deform under the pressure to connect the liquid injection channel 11 and the liquid injection hole 201.

[0101] Specifically, when the liquid injection assembly 100 injects liquid into the battery cell 200, it first presses the free end 23 of each valve disc 21 against the outer shell 202 of the battery cell 200, for example, against the top cover of the battery cell 200, so that the liquid injection channel 11 is aligned with the liquid injection hole 201 opened on the top cover.

[0102] Under the action of the pressure, the free ends 23 of each valve disc 21 bend and deform toward the inside of the injection channel 11, so that the injection channel 11 opens and the injection hole 201 is connected to each other, and liquid can be injected into the injection hole 201 through the injection channel 11.

[0103] Furthermore, after the liquid injection is completed, the liquid injection assembly 100 is removed. At this time, each valve 21 is separated from the top cover of the battery cell 200, and the pressure on each valve 21 disappears. Thus, under the action of its own elastic restoring force, the free end 23 of each valve 21 returns to the state of mutual sealing connection, thereby closing the liquid injection channel 11.

[0104] Therefore, each valve disc 21 can promptly block the electrolyte remaining in the injection channel 11, reducing the probability of electrolyte contaminating the battery cell 200.

[0105] In addition, compressed gas can be introduced into the injection channel 11 to push each valve 21 outward, thereby blowing out the residual electrolyte in the injection channel 11 and keeping the inside of the injection channel 11 clean.

[0106] Based on the same concept as the battery cell 200 described above, this application also provides a battery device including the battery cell 200 as described above.

[0107] Based on the same concept as the battery device described above, this application also provides an electrical device including the battery device described above.

[0108] According to one or more embodiments, in the initial state of actual use, each valve disc 21 is sealed to each other, and the liquid injection channel 11 is closed. When liquid injection is required, the free end 23 of each valve disc 21 is pressed against the top cover of the battery cell 200, so that the liquid injection channel 11 is aligned with the liquid injection hole 201.

[0109] Under the action of the pressure, the free ends 23 of each valve disc 21 bend and deform toward the inside of the injection channel 11, so that the injection channel 11 opens and the injection channel 11 is connected to the injection hole 201. At this time, electrolyte can be injected into the injection hole 201 through the injection channel 11.

[0110] After the electrolyte injection is completed, the electrolyte injection assembly 100 is removed. At this time, each valve disc 21 separates from the top cover of the battery cell 200, the pressure on each valve disc 21 disappears, and each valve disc 21 returns to a sealed connection under the action of its own elastic restoring force, thus closing the electrolyte injection channel 11. In this way, each valve disc 21 can block the residual electrolyte in the electrolyte injection channel 11, reducing the probability of electrolyte contamination of the battery cell 200.

[0111] In addition, compressed gas can be introduced into the injection channel 11 to push each valve 21 outward, thereby blowing out the residual electrolyte in the injection channel 11 and keeping the inside of the injection channel 11 clean.

[0112] 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.

[0113] 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 liquid injection assembly, characterized in that, For injecting liquid into the injection port of a battery cell, the injection assembly includes: The main body has an internal injection channel with an injection port that connects to the injection hole; and A deformable portion is provided at the end of the main body where the injection port is formed; The deformable part is configured to deform under external force to connect the injection channel and the injection hole when the injection port is connected to the injection hole, and to reset to close the injection channel when the injection port is separated from the injection hole.

2. The injection assembly according to claim 1, characterized in that, The main body and the deformable part are integrally formed.

3. The injection assembly according to claim 1, characterized in that, The deformable part includes multiple valve flaps, and each valve flap is arranged sequentially along the circumference of the injection port; Each valve disc has a connecting end connected to the main body and a free end disposed opposite to the connecting end. The free ends of each valve disc extend toward the center of the injection port and overlap and seal with each other.

4. The injection assembly according to claim 3, characterized in that, Each of the valve discs is configured as an elastic valve disc.

5. The injection assembly according to claim 3 or 4, characterized in that, In the circumferential direction of the injection port, the arc length of each valve disc gradually decreases from the connecting end to the free end.

6. The injection assembly according to claim 3 or 4, characterized in that, The free end of each valve disc is configured to bend and deform from outside the injection channel to inside the injection channel under the action of an external force when the injection port is connected to the injection hole.

7. The injection assembly according to claim 3 or 4, characterized in that, The thickness of each valve disc is no greater than 1 mm.

8. The injection assembly according to claim 7, characterized in that, The thickness of each valve disc is no greater than 0.5 mm.

9. The injection assembly according to claim 3 or 4, characterized in that, The number of valve discs is set to an even number, and in the radial direction of the injection port, every two valve discs are arranged opposite each other to form a group; In each group of valve discs, one extends at the free end to form a first step portion, and the other extends at the free end to form a second step portion. The first step portion and the second step portion are mutually sealed and overlapped along the axial direction of the injection channel.

10. The injection assembly according to claim 3 or 4, characterized in that, The number of valve discs is set to an even number, and in the radial direction of the injection port, every two valve discs are arranged opposite each other to form a group; In each set of valve discs, one of the valve discs protrudes at the free end to form a convex portion, and the other is recessed at the free end to form a groove. The convex portion and the groove are sealed and inserted together in a direction perpendicular to the axial direction of the injection channel.

11. A single battery cell, characterized in that, Liquid is injected using the liquid injection assembly as described in any one of claims 1-10, wherein the battery cell includes a housing and an electrode assembly disposed inside the housing, and the housing has a liquid injection hole. The deformable part of the injection assembly can press against the outer shell and deform under the pressure to connect the injection channel and the injection hole.

12. A battery device, characterized in that, Includes the battery cell as described in claim 11.

13. An electrical appliance, characterized in that, Includes the battery device as described in claim 12.

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