Liquid injection device and liquid injection apparatus

Abstract

The application relates to the technical field of battery production, in particular to a liquid injection device and liquid injection equipment. The liquid injection device is used for liquid injection of a battery monomer, and comprises a first supporting plate, a buffer cup connected with the first supporting plate through an elastic piece, and a cup supporting assembly arranged in correspondence with the buffer cup and used for supporting the battery monomer, so that the battery monomer is subjected to liquid injection through the buffer cup. The buffer cup and the elastic piece are provided with a plurality of buffer cups and elastic pieces, and the buffer cup and the elastic piece are arranged in one-to-one correspondence. In the above manner, each buffer cup can float when the battery monomer is subjected to liquid injection, so that the battery monomer is not affected by unevenness, the sealing degree between the battery monomer and the buffer cup during liquid injection is improved, and the liquid injection effect is better.

Description

Technical Field

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

[0002] Electricity is a highly environmentally friendly energy source, with applications in energy storage, transportation, consumer goods, scientific research, and many other fields. Especially in the automotive industry, with the rise of new energy vehicles, batteries are being used extensively. Therefore, battery technology is a crucial factor in social development.

[0003] In the development of battery technology, the battery manufacturing process is a crucial factor determining battery quality, and electrolyte injection is a vital step in this process. Therefore, improving the effectiveness of electrolyte injection is a pressing technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the above problems, this application provides a liquid injection device and liquid injection equipment. The liquid injection device can solve the technical problem of poor liquid injection effect by improving the connection method between the buffer cup and the support plate.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is to provide a liquid injection device for injecting liquid into a battery cell. The liquid injection device includes: a first support plate; a buffer cup connected to the first support plate through an elastic element; and a cup support assembly corresponding to the buffer cup for supporting the battery cell, thereby injecting liquid into the battery cell through the buffer cup. Multiple buffer cups and elastic elements are provided, with each buffer cup and elastic element corresponding to the other.

[0006] In this way, each buffer cup can float when filling the battery cell with electrolyte, so it is not affected by the unevenness of the battery cell, resulting in a better seal between the battery cell and the buffer cup during electrolyte filling and a better electrolyte filling effect.

[0007] In some embodiments, the elastic element is a spring, with one end of the spring connected to the first support plate and the other end connected to the buffer cup.

[0008] The elastic movement path of a spring is generally a straight line, which makes it less likely for the buffer cup to deviate when floating.

[0009] In some embodiments, the spring connects to the sidewall of the buffer cup, and at least part of the buffer cup is located inside the spring.

[0010] This design allows the portion of the buffer cup located within the spring to act as a guide when the spring contracts, preventing the spring from tilting during elastic deformation and further ensuring that the buffer cup does not easily deviate when floating.

[0011] In some embodiments, the injection device further includes a second support plate, which is connected to the first support plate by a connector. An opening is formed on the second support plate, and a buffer cup is provided with a corresponding opening.

[0012] The overall structural strength of the injection device is enhanced by the cooperation of the second support plate with the first support plate.

[0013] In some embodiments, the cup assembly includes: a third support plate; a cup connected to the third support plate; a first engaging member connected to the third support plate and extending toward the second support plate; the liquid injection device further includes a second engaging member connected to the second support plate and extending at least partially toward the third support plate; the first engaging member and / or the second engaging member are elastic structures, and the first engaging member engages with the second engaging member.

[0014] This structure enables the cup holder assembly and the second support plate to automatically interlock.

[0015] In some embodiments, the second engaging member is further provided with a limiting member, which is disposed between the second support plate and the third support plate and corresponds to the first engaging member.

[0016] This structure limits the distance between the cup support assembly and the second support plate, thereby preventing the cup support from being too close to the buffer cup and preventing the battery cells from being excessively squeezed during liquid injection.

[0017] In some embodiments, a positioning structure is provided at the opening of the second support plate to align the battery cell with the buffer cup.

[0018] The positioning structure can locate individual battery cells, making the alignment of the battery cells with the buffer cup more precise.

[0019] In some embodiments, the positioning structure is a protrusion of the second support plate toward the third support plate. The positioning structure is arranged around at least a partial opening. The inner wall of the positioning structure is formed with a tapering structure along a first direction, which is the direction from the third support plate toward the second support plate and is perpendicular to the second support plate, with a vertical error of 5°.

[0020] This positioning structure can achieve positioning through a tapering structure, ensuring positioning effectiveness while simplifying the structure.

[0021] In some embodiments, the tapering structure is a straight tapering structure or an arc tapering structure.

[0022] These two tapered structures allow for a smooth transition, making it easier to position individual battery cells.

[0023] In some embodiments, the buffer cup has an injection port and an outlet. The injection port is disposed away from the cup support assembly, and the outlet is disposed towards the cup support assembly for connecting to the battery cell. The injection device also includes a negative pressure component, which is disposed corresponding to the buffer cup. One end of the negative pressure component is in contact with the injection port of the buffer cup for negative pressure adsorption of the buffer cup.

[0024] This design prevents residual liquid in the buffer cup from dripping out of the outlet, reducing the risk of battery cells being contaminated.

[0025] In some embodiments, the negative pressure assembly includes: an airflow pipe, one end of which is connected to a negative pressure device; a sealing head, which is connected to the airflow pipe and can be connected to the liquid inlet of the buffer cup, and seals the liquid inlet of the buffer cup when connected; a negative pressure head, which is connected to the airflow pipe through the sealing head, and together with the sealing head and the airflow pipe, forms an airflow channel; or, the negative pressure head is connected to the airflow pipe, the sealing head is disposed on the outside of the negative pressure head, and together with the airflow pipe, the negative pressure head forms an airflow channel.

[0026] This structure can achieve better results when the buffer cup is subjected to negative pressure adsorption, further reducing the risk of battery cells being contaminated.

[0027] In some embodiments, multiple sealing heads and negative pressure heads are provided, and the sealing heads and negative pressure heads are provided in a one-to-one correspondence. Multiple sealing heads and negative pressure heads are provided on an airflow pipe.

[0028] This structure can save on the number of airflow pipes and simplify the structure of the negative pressure component.

[0029] In some embodiments, the entire sealing head or the outer peripheral portion of the sealing head is a flexible structure.

[0030] The flexible sealing head can achieve a better sealing effect on the filling port of the buffer cup.

[0031] In some embodiments, a liquid injection opening is provided on the first support plate, the buffer cup includes a main body and a neck, the neck is connected to the main body, a liquid injection port is formed at the end of the neck away from the main body, a liquid outlet is formed at the end of the main body away from the neck, the diameter of the part of the neck away from the main body is not greater than the diameter of the liquid injection opening, and the main body is connected to an elastic member.

[0032] In this way, part of the neck of the buffer cup can move through the injection opening, thus achieving better floating.

[0033] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a liquid injection device, which includes a liquid injection apparatus as described in any of the above-mentioned claims.

[0034] In this way, the buffer cup in each liquid injection device can float when injecting liquid into the battery cell, so as not to be affected by the unevenness of the battery cell, thus improving the sealing between the battery cell and the buffer cup and the liquid injection effect.

[0035] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above contents and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of an injection device according to one or more embodiments of this application;

[0038] Figure 2 for Figure 1 A schematic diagram of the AA cross-sectional structure of the injection device in the middle;

[0039] Figure 3 for Figure 2 A magnified structural diagram of region B in the diagram;

[0040] Figure 4 This is a three-dimensional structural schematic diagram of an injection device according to one or more embodiments of this application;

[0041] Figure 5 for Figure 4 A magnified structural diagram of region C in the middle;

[0042] Figure 6 This is a three-dimensional structural diagram of the positioning structure of the injection device according to one or more embodiments of this application;

[0043] Figure 7 This is a schematic diagram of the negative pressure component of the liquid injection device according to one or more embodiments of this application;

[0044] Figure 8 for Figure 7 A magnified structural diagram of region D in the diagram.

[0045] Among them, 100-liquid injection device; 110-first support plate; 120-buffer cup; 121-liquid injection port; 122-liquid outlet; 123-main body; 124-neck; 130-elastic element; 140-cup support assembly; 141-third support plate; 142-cup support; 143-first locking element; 150-second support plate; 151-second locking element; 154-limiting element; 152-positioning structure; 153-gradient structure; 160-connector; 170-negative pressure assembly; 171-airflow pipe; 172-sealing head; 173-negative pressure head; 200-battery cell. Detailed Implementation

[0046] The embodiments of the technical solution of this application will be described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples, and should not be used to limit the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, unless otherwise explicitly specified, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0051] In the description of the embodiments of this application, the technical terms "length", "above", "below", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0052] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0053] The battery device disclosed in this application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using battery cells and batteries disclosed in this application.

[0054] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0055] The battery device includes a housing and individual battery cells, with the battery cells housed within the housing. The housing provides space for the battery cells and can have various structures. In some embodiments, the housing may include a first part and a second part, which overlap each other, collectively defining a space for accommodating the battery cells. The second part may be a hollow structure open at one end, while the first part may be a plate-like structure, covering the open side of the second part so that the first and second parts together define the space. Therefore, the first part can also be called a top cover, and the second part can also be called a housing section. Alternatively, both the first and second parts may be hollow structures open on one side, with the open side of the first part covering the open side of the second part. Of course, the housing formed by the first and second parts can have various shapes, such as a cylinder, a cuboid, etc.

[0056] In a battery device, there can be multiple battery cells, which can be connected in series, parallel, or a combination thereof. A combination of series and parallel connections refers to multiple battery cells being connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly is housed within a casing. Alternatively, the battery device can consist of multiple battery cells first connected in series, parallel, or a combination thereof to form battery modules, which are then connected in series, parallel, or a combination thereof to form a single unit housed within a casing. The battery device may also include other structures, such as a busbar component for electrical connection between the multiple battery cells. Each battery cell can be a secondary or primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. Battery cells can be square or round. A square battery cell is a rectangular prism, and a round battery cell is a cylindrical shape.

[0057] During the production of battery cells, electrolyte needs to be injected, a process known as electrolyte filling. To improve filling efficiency, multiple battery cells are typically placed in a support cup and filled together. However, due to individual differences in battery cells or unexpected situations during placement in the support cup, the height of the battery cells may not be completely uniform. In existing technology, the height of the support cup is uniform, which can lead to insufficient contact between some battery cells and the support cup, creating gaps. This results in inadequate sealing during electrolyte filling, affecting the filling effect. These gaps allow electrolyte to leak out, contaminating the battery cell.

[0058] Based on the above considerations, to address the technical problem in existing technologies where insufficient sealing between the battery cells and the buffer cups during electrolyte injection can affect the injection effect, this application proposes an electrolyte injection device and equipment. In this device, the buffer cups are connected to a first support plate via elastic elements, and multiple buffer cups and elastic elements are provided, with each buffer cup and elastic element corresponding to the other, allowing each buffer cup to achieve a certain displacement via the elastic elements. When the battery cells have uneven heights, the taller battery cells will first contact the buffer cup, then push the buffer cup to move the elastic elements, thus achieving the floating of a single buffer cup. The floating of a single buffer cup does not affect the position of other buffer cups, which can continue to contact battery cells of varying heights, thereby preventing gaps between the battery cells and the buffer cups, improving the sealing during electrolyte injection, and resulting in a better injection effect.

[0059] To prevent gaps between battery cells and the buffer cup, improve sealing during electrolyte filling, and achieve better filling results, this application provides an electrolyte filling device and equipment. Please refer to the following: Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of an injection device according to one or more embodiments of this application; Figure 2 for Figure 1 A schematic diagram of the AA cross-sectional structure of the injection device in the middle; Figure 3 for Figure 2 The diagram shows an enlarged view of region B. The liquid injection device 100 is used to inject liquid into the battery cell 200 and includes a first support plate 110, a buffer cup 120, an elastic element 130, and a cup support assembly 140. The buffer cup 120 is connected to the first support plate 110 via the elastic element 130. The cup support assembly 140 is correspondingly arranged with the buffer cup 120 to support the battery cell 200, thereby injecting liquid into the battery cell 200 through the buffer cup 120. Multiple buffer cups 120 and multiple elastic elements 130 are provided, with each buffer cup 120 and elastic element 130 corresponding to the other.

[0060] The first support plate 110 is a supporting and fixing structure used to fix the buffer cups 120, allowing the buffer cups 120 to be arranged as needed. The buffer cups 120 are components connected to the battery cells 200 for electrolyte filling and buffering the electrolyte. The external electrolyte storage component pours the electrolyte into the filling cup, and then the electrolyte flows into the battery cells 200 through the filling cup. The elastic element 130 is a component capable of elastic deformation, thereby causing the components it is connected to to move. The elastic element 130 is a passive moving component; it deforms under the action of external force and returns to its original state when the external force is removed. The cup support assembly 140 is a component used to support the battery cells 200. The battery cells 200 are placed on and fixed by the cup support assembly 140, and then the first support plate 110 is moved by a power device (not shown), for example, the power device moves the first support plate 110 toward the cup support assembly 140, thereby causing the buffer cups 120 to contact the battery cells 200. After the buffer cup 120 comes into contact with the battery cell 200, electrolyte is injected. After the electrolyte injection is completed, the power device drives the first support plate 110 to move away from the cup holder assembly 140, thereby removing the buffer cup 120 from the battery cell 200 and freeing the battery cell 200 so that the next batch of battery cells 200 can be replaced. Alternatively, the power device can drive the cup holder assembly 140 to move, or the power device can drive the cup holder assembly 140 and the first support plate 110 to move together. To improve working efficiency, multiple battery cells 200 are usually injected with electrolyte simultaneously. Therefore, an electrolyte injection device 100 may include multiple buffer cups 120 and elastic elements 130. Each buffer cup 120 is connected to the first support plate 110 through an elastic element 130, thereby achieving a one-to-one correspondence between the buffer cup 120 and the elastic element 130. During electrolyte injection, if the battery cell 200 is relatively tall, it will first contact its corresponding buffer cup 120 and push the buffer cup 120 to move, causing the elastic element 130 to deform elastically, thereby enabling the buffer cup 120 to float. Since each buffer cup 120 is independent, the movement of one buffer cup 120 does not affect the position of other buffer cups 120, and other battery cells 200 with lower heights can continue to dock normally with the buffer cups 120.

[0061] In this way, each buffer cup 120 can float when filling the battery cell 200 with liquid, so that it is not affected by the unevenness of the battery cell 200, and the sealing between the battery cell 200 and the buffer cup 120 is better during the liquid filling process.

[0062] In some embodiments, the elastic element 130 is a spring, with one end of the spring connected to the first support plate 110 and the other end connected to the buffer cup 120.

[0063] A spring is a common elastic component, a mechanical part that works by utilizing elasticity. The structure of a spring ensures that the path of elastic deformation is straight, making it simple to design, easy to install, and relatively inexpensive.

[0064] The elastic movement path of the spring is generally a straight line, which makes it less likely for the buffer cup 120 to deviate when floating.

[0065] In some embodiments, the spring connects to the sidewall of the buffer cup 120, and at least a portion of the buffer cup 120 is located inside the spring.

[0066] The spring is a hollow cylindrical structure. Because of its hollow interior, a portion of the buffer cup 120 can be incorporated into the hollow area of ​​the spring. The sidewall of the buffer cup 120 is its outer sidewall, and the spring can connect to the circumference of this outer sidewall. Since the buffer cup 120 is generally cylindrical, and the spring is also cylindrical, it can be fitted around the outer circumference of the buffer cup 120.

[0067] This design allows the portion of the buffer cup 120 located within the spring to act as a guide when the spring contracts, thereby preventing the spring from tilting during elastic deformation and further making it less prone to deviation when the buffer cup 120 floats.

[0068] In some embodiments, the injection device 100 further includes a second support plate 150, which is connected to the first support plate 110 via a connector 160. An opening is formed at the second support plate 150, and the buffer cup 120 is provided with a corresponding opening.

[0069] The second support plate 150 is disposed opposite to the first support plate 110 and can be located on opposite sides of the buffer cup 120. The second support plate 150 can be disposed parallel to the first support plate 110. Considering tolerance, the angle error is 3°, that is, the angle between the second support plate 150 and the first support plate 110 is less than or equal to 3° and is considered that the second support plate 150 and the first support plate 110 are parallel. The connector 160 is a component that connects the first support plate 110 and the second support plate 150. The connector 160 can be a columnar structure or a plate structure. A portion of the buffer cup 120 can pass through the opening so that it can be inserted into the battery cell 200.

[0070] The second support plate 150 cooperates with the first support plate 110 to enhance the overall structural strength of the injection device 100.

[0071] Please refer to further information. Figure 4 and Figure 5 , Figure 4 This is a three-dimensional structural schematic diagram of an injection device according to one or more embodiments of this application; Figure 5 for Figure 4An enlarged structural schematic diagram of region C. In some embodiments, the cup assembly 140 includes: a third support plate 141; a cup 142 connected to the third support plate 141; a first engaging member 143 connected to the third support plate 141 and extending toward the second support plate 150; the liquid injection device 100 further includes a second engaging member 151, which is connected to the second support plate 150 and extends at least partially toward the third support plate 141; the first engaging member 143 and / or the second engaging member 151 are elastic structures, and the first engaging member 143 and the second engaging member 151 engage with each other.

[0072] The third support plate 141 is a plate-like structure used to support the cup 142. The cup 142 is a component used to hold the battery cell 200. The cup 142 has grooves corresponding to the shape of the battery cell 200. The battery cell 200 is placed in the groove of the cup 142, also referred to as the battery cell 200 being placed in the cup 142. Multiple cups 142 can be provided on the third support plate 141. The number and arrangement of the cups 142 can be the same as those of the buffer cup 120. The cups 142 and the buffer cup 120 correspond one-to-one to facilitate the connection of the buffer cup 120 to the battery cell 200 on the cup 142. The first engaging member 143 and the second engaging member 151 are components used to engage and connect. The second support plate 150 is arranged opposite to the third support plate 141. The first engaging member 143 is connected to the third support plate 141 and is oriented towards the second support plate 150. The second engaging member 151 connects to the second support plate 150 and is positioned towards the third support plate 141. This arrangement ensures that when the first engaging member 143 and the second engaging member 151 are engaged, there is a certain distance between the second support plate 150 and the third support plate 141. To facilitate engagement between the first engaging member 143 and the second engaging member 151, one of them can be an elastic structure, or both can be elastic structures. This allows the first engaging member 143 and / or the second engaging member 151 to deform during engagement, making engagement easier. The first engaging member 143 and the second engaging member 151 can be strip-shaped structures, thus, regardless of whether they are made of metal or plastic, strip-shaped structures can possess a certain degree of elasticity, making them elastic structures.

[0073] In some embodiments, the second engaging member 151 has a protruding structure at one end facing the third support plate 141, and the first engaging member 143 has a recessed structure at one end facing the second support plate 150. The protruding structure and the recessed structure cooperate to complete the engaging connection. When the first support plate 110, the second support plate 150, and the buffer cup 120 move toward the third support plate 141 and the cup holder 142, the first engaging member 143 and the second engaging member 151 first abut against each other, and then deform. The protruding structure moves into the recessed structure to form an engaging engagement, thereby interlocking the cup holder assembly 140 with the second support plate 150. When the first support plate 110, the second support plate 150 and the buffer cup 120 move away from the third support plate 141 and the cup holder 142, the protruding structure of the second engaging member 151 and / or the recessed structure of the first engaging member 143 deforms, causing the protruding structure of the second engaging member 151 to disengage from the recessed structure of the first engaging member 143, thereby disengaging from the engaging connection.

[0074] This structure enables the cup holder assembly 140 and the second support plate 150 to automatically interlock, ensuring the distance between the buffer cup 120 and the cup holder assembly 140.

[0075] In some embodiments, the second latching member 151 is further provided with a limiting member 154, which is disposed between the second support plate 150 and the third support plate 141 and corresponds to the first latching member 143.

[0076] The limiting member 154 can have any structure, such as a plate or a block, as long as it can abut against the first engaging member 143 after the first engaging member 143 and the second engaging member 151 are engaged, preventing the first engaging member 143 from moving excessively. The limiting member 154 can be an integral part of the second engaging member 151.

[0077] This structure limits the distance between the cup assembly 140 and the second support plate 150, thereby preventing the cup 142 from being too close to the buffer cup 120 and preventing the battery cell 200 from being excessively squeezed during liquid injection.

[0078] In some embodiments, a positioning structure 152 is provided at the opening of the second support plate 150 to align the battery cell 200 with the buffer cup 120.

[0079] The positioning structure 152 is used to position the battery cell 200, ensuring that the designated position of the battery cell 200 is located at the opening of the second support plate 150, preventing the battery cell 200 from shifting. The specific shape of the positioning structure 152 can be determined according to the shape of the battery cell 200. When the battery cell 200 is a circular battery, the positioning structure 152 can be annular. When the battery cell 200 is a square battery, the positioning structure 152 can be rectangular.

[0080] The positioning structure 152 can position the battery cell 200, making the alignment of the battery cell 200 and the buffer cup 120 more accurate.

[0081] Please refer to further information. Figure 6 , Figure 6 This is a perspective structural diagram of the positioning structure of an injection device according to one or more embodiments of this application. In some embodiments, the positioning structure 152 is a protrusion of the second support plate 150 toward the third support plate 141. The positioning structure 152 is arranged around at least a partial opening. The inner wall of the positioning structure 152 has a tapering structure 153 formed along a first direction, which is the direction from the third support plate 141 toward the second support plate 150 and is perpendicular to the second support plate 150, with a vertical error of 5°.

[0082] The positioning structure 152 is disposed on the surface of the second support plate 150 facing the third support plate 141 and protrudes towards the third support plate 141. The positioning structure 152 can be a ring structure surrounding the opening; or it can be multiple arc-shaped structures surrounding a portion of the opening. The inner wall of the positioning structure 152 is the inner sidewall communicating with the opening, and the positioning structure 152 cannot cover the opening. The inner wall of the positioning structure 152 forms a tapering structure 153 in the first direction, which can guide the battery cell 200 to a certain extent. The first direction is perpendicular to the second support plate 150. Considering tolerance and other factors, an angle of 85° to 95° between the first direction and the second support plate 150 can be considered a perpendicular relationship.

[0083] This positioning structure 152 can achieve positioning through the tapering structure 153, ensuring the positioning effect while making the structure simpler.

[0084] In some embodiments, the tapering structure 153 is a straight tapering structure 153 or an arc tapering structure 153.

[0085] The straight-line tapering structure 153 has a straight edge in its cross-sectional view, which tapers gradually along the straight line. The curved tapering structure 153 has an arc-shaped edge in its cross-sectional view, which tapers gradually along the arc.

[0086] These two tapered structures 153 can achieve a smooth transition, which is more conducive to the positioning of the battery cell 200.

[0087] Please refer to further information. Figure 7 , Figure 7This is a schematic diagram of the negative pressure component of a liquid injection device according to one or more embodiments of this application. In some embodiments, the buffer cup 120 has an injection port 121 and an outlet port 122. The injection port 121 is disposed away from the cup support assembly 140, and the outlet port 122 is disposed towards the cup support assembly 140, for docking with the battery cell 200. The liquid injection device 100 also includes a negative pressure component 170, which is disposed corresponding to the buffer cup 120. One end of the negative pressure component 170 is in contact with the injection port 121 of the buffer cup 120 for negative pressure adsorption of the buffer cup 120.

[0088] Electrolyte is injected into the buffer cup 120 through the injection port 121, and then flows into the battery cell 200 through the outlet 122 of the buffer cup 120. The negative pressure assembly 170 is a component that can create negative pressure by evacuating air. When the buffer cup 120 is in use, the injection port 121 is at the top and the outlet 122 is at the bottom, so that the electrolyte in the buffer cup 120 flows out through the outlet 122 under the action of gravity. During the injection phase, electrolyte needs to be injected into the injection port 121 of the buffer cup 120, so the negative pressure assembly 170 is separated from the buffer cup 120. After the injection is completed, the negative pressure assembly 170 moves to contact and connect with the injection port 121 of the buffer cup 120 and performs negative pressure adsorption on the buffer cup 120. The outlet 122 of the buffer cup 120 will then draw in air and prevent liquid from flowing out, thus preventing residual electrolyte in the buffer cup 120 from flowing out through the outlet 122. In some embodiments, the injection device may also include a power component that drives the negative pressure assembly to move. The power component may be a commonly used power device such as a cylinder or an electric motor, and is not limited here.

[0089] This design prevents residual liquid in the buffer cup 120 from dripping out of the outlet 122, reducing the risk of contamination of the battery cell 200.

[0090] Please refer to further information. Figure 8 , Figure 8 for Figure 7 The diagram shows an enlarged view of region D. In some embodiments, the negative pressure assembly 170 includes an airflow pipe 171, a sealing head 172, and a negative pressure head 173. One end of the airflow pipe 171 is connected to the negative pressure device. The sealing head 172 is connected to the airflow pipe 171 and can abut against the liquid inlet 121 of the buffer cup 120, sealing the liquid inlet 121 of the buffer cup 120 during connection. The negative pressure head 173 is connected to the airflow pipe 171 through the sealing head 172, forming an airflow channel together with the sealing head 172 and the airflow pipe 171. Alternatively, the negative pressure head 173 is connected to the airflow pipe 171, and the sealing head 172 is disposed on the outside of the negative pressure head 173, forming an airflow channel together with the airflow pipe 171.

[0091] The airflow pipe 171 is a conduit that allows gas to flow. The airflow pipe 171 can be circular or square; its specific shape can be designed according to actual needs without affecting its use. The sealing head 172 is a component used to seal the liquid inlet of the buffer cup 120. The outer perimeter of the sealing head 172 is not less than the perimeter of the liquid inlet 121 of the buffer cup 120. When the negative pressure assembly 170 is connected to the buffer cup 120, the sealing head 172 needs to cover the liquid inlet 121 of the buffer cup 120. The shape of the sealing head 172 can be adapted to the shape of the liquid inlet 121 of the buffer cup. When the negative pressure assembly 170 is connected to the buffer cup 120, the negative pressure head 173 extends into the interior of the buffer cup 120 to apply negative pressure adsorption to the interior of the buffer cup 120. The airflow pipe 171 can be connected to the sealing head 172, which in turn is connected to the negative pressure head 173. This structure requires that the sealing head 172 also has an airflow channel, allowing gas to enter the airflow pipe 171 through the negative pressure head 173 and the sealing head 172. In this case, the negative pressure head 173 is connected to the airflow pipe 171 through the sealing head 172, forming an airflow channel together with the sealing head 172 and the airflow pipe 171. Alternatively, the negative pressure head 173 can be directly connected to the airflow pipe 171, forming an airflow channel together with the airflow pipe 171. The sealing head 172 is located on the outer periphery of the negative pressure head 173 to seal the liquid injection port 121 of the buffer cup 120.

[0092] This structure can achieve better results when the buffer cup 120 is subjected to negative pressure adsorption, further reducing the risk of contamination of the battery cell 200.

[0093] In some embodiments, multiple sealing heads 172 and negative pressure heads 173 are provided, and the sealing heads 172 and negative pressure heads 173 are provided in a one-to-one correspondence. Multiple sealing heads 172 and negative pressure heads 173 are provided on an airflow pipe 171.

[0094] Since there are multiple buffer cups 120, multiple sealing heads 172 and negative pressure heads 173 are required. The number of sealing heads 172 and negative pressure heads 173 can be the same as the number of buffer cups 120. The function of the airflow pipe 171 is to pass air, so it does not need to correspond one-to-one with the buffer cups 120. One airflow pipe 171 can be equipped with multiple sealing heads 172 and negative pressure heads 173. There can be one or multiple airflow pipes 171, depending on the specific requirements. The airflow pipes 171 can be arranged in a straight line, and multiple airflow pipes 171 can be arranged side by side.

[0095] This structure can save the number of airflow pipes 171 and simplify the structure of the negative pressure assembly 170.

[0096] In some embodiments, the entire sealing head 172 or the outer peripheral portion of the sealing head 172 is a flexible structure.

[0097] The sealing head 172 needs to seal the filling port 121 of the buffer cup 120, and the flexible structure can deform under stress to ensure that the sealing head 172 completely covers the filling port 121 of the buffer cup 120. The flexible structure can be rubber, resin, etc.

[0098] The flexible sealing head 172 can achieve a better sealing effect on the liquid injection port 121 of the buffer cup 120.

[0099] In some embodiments, the first support plate 110 is provided with a liquid injection opening, the buffer cup 120 includes a main body 123 and a neck 124, the neck 124 is connected to the main body 123, a liquid injection port 121 is formed at one end of the neck 124 away from the main body 123, a liquid outlet 122 is formed at one end of the main body 123 away from the neck 124, the diameter of a portion of the neck 124 away from the main body 123 is not greater than the diameter of the liquid injection opening, and the main body 123 is connected to an elastic member 130.

[0100] The electrolyte inlet is an opening formed on the first support plate 110, which exposes the electrolyte inlet 121 of the buffer cup 120. The electrolyte inlet 121 of the buffer cup 120 extends out of the first support plate 110 from this opening, or other components extend into this opening to connect to the electrolyte inlet 121 of the buffer cup 120. The main body 123 of the buffer cup 120 is its lower portion, and the neck 124 is its upper portion. The main body 123 is used to store electrolyte and connect to the battery cell 200, while the neck 124 corresponds to the electrolyte inlet of the first support plate 110 and receives the injection of electrolyte. The neck 124 is connected to the main body 123. The main body 123 has a larger diameter to store electrolyte, and the diameter of the portion of the neck 124 connected to the main body 123 gradually decreases away from the main body 123 until it is the same as or smaller than the diameter of the opening. Furthermore, the dimension of the portion of the neck 124 whose diameter is the same as or smaller than the diameter of the opening in the first direction must be larger than the dimension of the first support plate 110 in the first direction. The main body 123 is connected to the elastic element 130, and at least a portion of the neck 124 is located within the elastic element 130. For example, the elastic element 130 is a spring, and at least a portion of the neck 124 is located within the hollow portion in the middle of the elastic element 130. A sealing element may also be provided at the liquid injection opening, and the neck 124 is in contact with the sealing element. The main body 123 and the neck 124 are simply different names for different locations within the buffer cup 120.

[0101] In this way, a portion of the neck 124 of the buffer cup 120 can move through the injection opening, thereby achieving better floating.

[0102] The above-mentioned liquid injection device 100 can inject liquid into either round or square battery cells.

[0103] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a liquid injection device, which includes a liquid injection device 100 as described in any of the above.

[0104] In this way, the buffer cup 120 in each liquid injection device can float when injecting liquid into the battery cell 200, so that it is not affected by the unevenness of the battery cell 200, and the sealing between the battery cell 200 and the buffer cup 120 is better during liquid injection, resulting in a better liquid injection effect.

[0105] Finally, in a specific application scenario, to prevent gaps between the battery cell 200 and the buffer cup 120, improve the sealing during liquid injection, and achieve better liquid injection results, this application provides a liquid injection device 100 and a liquid injection equipment. The liquid injection device 100 of this application is used to inject liquid into the battery cell 200 and includes a first support plate 110, a buffer cup 120, an elastic element 130, and a cup support assembly 140. The buffer cup 120 is connected to the first support plate 110 through the elastic element 130. The cup support assembly 140 is correspondingly arranged with the buffer cup 120 to support the battery cell 200, thereby injecting liquid into the battery cell 200 through the buffer cup 120. Multiple buffer cups 120 and multiple elastic elements 130 are provided, with one buffer cup 120 and one elastic element 130 corresponding to each other. The elastic element 130 is a spring, with one end connected to the first support plate 110 and the other end connected to the buffer cup 120. The liquid injection device 100 further includes a second support plate 150, which is connected to the first support plate 110 via a connector 160. An opening is formed in the second support plate 150, and a buffer cup 120 is correspondingly positioned at the opening. The cup support assembly 140 includes: a third support plate 141; a cup 142 connected to the third support plate 141; and a first engaging member 143 connected to the third support plate 141 and extending toward the second support plate 150. The liquid injection device 100 also includes a second engaging member 151, which is connected to the second support plate 150 and extends at least partially toward the third support plate 141. The first engaging member 143 and / or the second engaging member 151 are elastic structures, engaging and cooperating with each other. A positioning structure 152 is provided at the opening of the second support plate 150 to align the battery cell 200 with the buffer cup 120. The buffer cup 120 has an injection port 121 and an outlet 122. The injection port 121 is located away from the cup support assembly 140, and the outlet 122 is located towards the cup support assembly 140, for connecting to the battery cell 200. The injection device 100 also includes a negative pressure assembly 170, which is positioned corresponding to the buffer cup 120. One end of the negative pressure assembly 170 is in contact with the injection port 121 of the buffer cup 120 for negative pressure adsorption of the buffer cup 120.

[0106] In this way, each buffer cup 120 can float during the liquid injection of the battery cell 200, thus avoiding the influence of unevenness of the battery cell 200, resulting in a better seal between the battery cell 200 and the buffer cup 120 and a more effective liquid injection. The elastic movement path of the spring is generally linear, making it less likely for the buffer cup 120 to deviate during floating. The second support plate 150 cooperates with the first support plate 110 to enhance the overall structural strength of the liquid injection device 100. This structure enables automatic interlocking between the cup support assembly 140 and the second support plate 150, ensuring the distance between the buffer cup 120 and the cup support assembly 140. The positioning structure 152 can position the battery cell 200, making the alignment between the battery cell 200 and the buffer cup 120 more precise. This setting prevents residual liquid in the buffer cup 120 from dripping out of the outlet 122, reducing the risk of contamination of the battery cell 200.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A liquid injection device for injecting liquid into a battery cell, characterized in that, The injection device includes: First support plate; The buffer cup is connected to the first support plate via an elastic element; A cup support assembly, corresponding to the buffer cup, is used to support the battery cell, thereby allowing the battery cell to be injected with electrolyte through the buffer cup; The buffer cup and the elastic element are provided in multiple ways, and the buffer cup and the elastic element are provided in a one-to-one correspondence.

2. The liquid injection device according to claim 1, characterized in that, The elastic element is a spring, with one end of the spring connected to the first support plate and the other end connected to the buffer cup.

3. The liquid injection device according to claim 2, characterized in that, The spring is connected to the side wall of the buffer cup, and at least part of the buffer cup is located inside the spring.

4. The liquid injection device according to any one of claims 1-3, characterized in that, The liquid injection device further includes a second support plate, which is connected to the first support plate by a connector. An opening is formed in the second support plate, and the buffer cup is provided corresponding to the opening.

5. The liquid injection device according to claim 4, characterized in that, The cup holder assembly includes: Third support plate; The cup holder is connected to the third support plate. The first fastener is connected to the third support plate and extends toward the second support plate; The injection device further includes a second engaging member, which is connected to the second support plate and extends at least partially toward the third support plate; The first engaging component and / or the second engaging component are elastic structures, and the first engaging component and the second engaging component engage with each other.

6. The liquid injection device according to claim 5, characterized in that, The second engaging component is also provided with a limiting component, which is disposed between the second support plate and the third support plate, and is provided corresponding to the first engaging component.

7. The liquid injection device according to claim 5, characterized in that, The second support plate has a positioning structure at its opening to align the battery cell with the buffer cup.

8. The liquid injection device according to claim 7, characterized in that, The positioning structure is a protrusion of the second support plate facing the third support plate. The positioning structure is arranged around at least part of the opening. The inner wall of the positioning structure has a tapering structure along a first direction. The first direction is the direction from the third support plate to the second support plate and is perpendicular to the second support plate, with a vertical error of 5°.

9. The liquid injection device according to claim 8, characterized in that, The tapering structure can be a straight tapering structure or an arc tapering structure.

10. The liquid injection device according to any one of claims 1-3, characterized in that, The buffer cup has an injection port and an outlet. The injection port is located away from the cup support assembly, and the outlet is located towards the cup support assembly, for connecting to the battery cell. The injection device also includes a negative pressure component, which is located corresponding to the buffer cup. One end of the negative pressure component is in contact with the injection port of the buffer cup for negative pressure adsorption of the buffer cup.

11. The liquid injection device according to claim 10, characterized in that, The negative pressure component includes: The airflow pipe is connected at one end to the negative pressure equipment. A sealing head is connected to the airflow tube. The sealing head can be connected to the liquid inlet of the buffer cup and seals the liquid inlet of the buffer cup when connected. The negative pressure head is connected to the airflow pipe through the sealing head, forming an airflow channel together with the sealing head and the airflow pipe; or, the negative pressure head is connected to the airflow pipe, the sealing head is disposed on the outside of the negative pressure head, and the negative pressure head and the airflow pipe together form the airflow channel.

12. The liquid injection device according to claim 11, characterized in that, Multiple sealing heads and negative pressure heads are provided, and each sealing head and negative pressure head is provided in a one-to-one correspondence. Multiple sealing heads and negative pressure heads are provided on one airflow pipe.

13. The liquid injection device according to claim 11, characterized in that, The sealing head as a whole or the outer periphery of the sealing head is a flexible structure.

14. The liquid injection device according to claim 10, characterized in that, The first support plate is provided with a liquid injection opening. The buffer cup includes a main body and a neck. The neck is connected to the main body. The liquid injection port is formed at the end of the neck away from the main body. The liquid outlet is formed at the end of the main body away from the neck. The diameter of the part of the neck away from the main body is not greater than the diameter of the liquid injection opening. The main body is connected to the elastic member.

15. A liquid injection device, characterized in that, The injection device includes the injection apparatus as described in any one of claims 1-14.

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