Electrolyte injection nozzle and electrolyte injection device

Abstract

The utility model relates to an electrolyte injection nozzle and an electrolyte injection device, and relates to the technical field of battery manufacturing equipment. The electrolyte injection nozzle comprises an electrolyte injection part and a connecting part, the liquid injection part is used for connecting a liquid injection hole of a battery cell and injecting liquid; the connecting part is arranged at one end, far away from the liquid injection hole, of the liquid injection part; and a communicating hole is formed in the electrolyte injection nozzle and penetrates through the electrolyte injection part and the connecting part. The end, close to the liquid injection hole, of the liquid injection part is provided with a liquid injection structure, the peripheral face of the liquid injection structure is a conical face, the size of the conical face is gradually reduced in the direction close to the liquid injection hole, and the hole diameter of the part, close to the liquid injection hole, of the communicating hole is gradually reduced. According to the electrolyte injection nozzle provided by the invention, electrolyte residues at the position of the electrolyte injection nozzle can be reduced in the electrolyte injection process, so that dotted overflow on the surface of a battery cell is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing equipment, in particular to an electrolyte injection nozzle and an injection device. BACKGROUND

[0002] In the production process of power batteries, one step is to inject electrolyte into the battery. In the process of large-scale production, professional injection equipment is usually used to inject electrolyte into the battery cell from the injection hole.

[0003] In the prior art, the injection equipment generally includes an injection nozzle. The injection nozzle is directly connected to the injection hole for injection. At this time, in order to ensure the injection amount and the injection efficiency, the end area of the injection nozzle usually needs to be set large.

[0004] However, the large end area of the injection nozzle will cause more electrolyte to remain in the injection nozzle after the injection is completed. The remaining electrolyte may drop on the battery cell in the subsequent injection process, thereby causing point overflow on the surface of the battery cell and affecting the product yield of the battery cell. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the present application is to provide an electrolyte injection nozzle and an injection device, which can reduce the electrolyte remaining at the position of the injection nozzle during injection, thereby reducing the point overflow on the surface of the battery cell.

[0006] In order to achieve the above purpose, according to the first aspect of the present application, an electrolyte injection nozzle is provided. The electrolyte injection nozzle includes an injection part and a connecting part. The injection part is used to connect the injection hole of the battery cell and perform injection, and the connecting part is arranged at one end of the injection part away from the injection hole. A communication hole is formed in the electrolyte injection nozzle, which penetrates the injection part and the connecting part. The end of the injection part close to the injection hole is provided as an injection structure, the outer peripheral surface of the injection structure is a tapered surface, the size of the tapered surface gradually decreases in the direction close to the injection hole, and the hole diameter of the communication hole close to the injection hole gradually shrinks.

[0007] Based on the above-mentioned embodiments of the present application, the above-mentioned electrolyte injection nozzle, when in use, the injection part in direct contact with the injection hole of the battery cell is provided as a tapered structure, and the corresponding communication hole inside the injection part is provided as a funnel-shaped structure. Therefore, without affecting the electrolyte input efficiency of the connecting part of the injection nozzle, the size of the end of the injection part is reduced, the contact area of the end of the injection part with the battery cell is reduced, the residual amount of electrolyte at the contact position of the injection part with the injection hole after injection is reduced, and the possibility of point overflow caused by the residual electrolyte dropping on the surface of the battery cell is reduced.

[0008] In some embodiments, the communication hole comprises a first liquid injection section and a second liquid injection section in communication with each other, and a contraction portion of the communication hole is formed in the second liquid injection section, and a cross-sectional area of the first liquid injection section is greater than a cross-sectional area of the second liquid injection section.

[0009] Based on the above-mentioned embodiments of the present application, by dividing the communication hole into a first liquid injection section and a second liquid injection section, and arranging the second liquid injection section on a side of the first liquid injection section close to the liquid injection hole of the battery cell, a funnel-shaped structure is formed in the second liquid injection section, so that the end of the second liquid injection section close to the liquid injection hole has a small size, and the taper structure formed on the end of the liquid injection part close to the liquid injection hole makes the contact area between the electrolyte injection nozzle and the liquid injection hole of the battery cell smaller, thereby reducing the residual electrolyte after injection. At the same time, by arranging the first liquid injection section to have a size greater than the second liquid injection section, the flow of electrolyte injected into the communication hole is ensured, thereby ensuring the injection efficiency.

[0010] In some embodiments, a fixing section is further arranged between the first liquid injection section and the second liquid injection section, and the cross-sectional area of the fixing section is greater than the cross-sectional area of the first liquid injection section.

[0011] Based on the above-mentioned embodiments of the present application, by arranging the fixing section and making the size of the fixing section greater than the first liquid injection section and the second liquid injection section, the electrolyte injection nozzle can be conveniently connected to other components, for example, the electrolyte injection nozzle is connected to the injection needle, and the fixing section can have an effect similar to a card slot when connected, and the electrolyte injection nozzle and the injection needle are quickly and stably connected and fixed by clamping.

[0012] In some embodiments, the connection part is arranged in a circular column structure, the liquid injection part is arranged in a circular cone structure, and the cross section of the communication hole is arranged in a circular structure.

[0013] Based on the above-mentioned embodiments of the present application, the electrolyte injection nozzle is arranged as a whole in a circular structure, and the communication hole is also arranged in a circular structure, thereby increasing the flow area during injection, thereby improving the injection efficiency.

[0014] In some embodiments, the diameter of the liquid injection part close to the liquid injection hole is φ1, and 5mm≤φ1≤7mm.

[0015] Based on the above-mentioned embodiments of the present application, by limiting the diameter of the liquid injection part close to the liquid injection hole, that is, limiting the diameter of the contact surface of the liquid injection part with the battery cell during injection, the electrolyte residual amount caused by the excessively large contact surface area between the liquid injection part and the battery cell is avoided, thereby avoiding the point-shaped overflow on the surface of the battery cell.

[0016] In some embodiments, the diameter of the communication hole close to the liquid injection hole is φ2, and 3.5mm≤φ2≤4mm.

[0017] Based on the above-mentioned embodiments of the present application, by limiting the diameter of the communication hole close to the liquid injection hole, and cooperating with the limitation of the diameter of the liquid injection part close to the liquid injection hole, the area of the annular contact area of the end of the liquid injection part can be limited, and the wall thickness of the end of the liquid injection part can be avoided, and the strength of the end of the liquid injection part can be avoided.

[0018] In some embodiments, a step surface is formed at the joint position of the liquid injection part and the connecting part, and / or the liquid injection part is provided with at least two sub-bodies with different sizes and a step surface is formed.

[0019] Based on the above-mentioned embodiments of the present application, the cross-sectional diameter of the electrolyte injection nozzle gradually decreases from the connecting part to the liquid injection part, and by forming a step surface, the diameter between the connecting part and the liquid injection part can be reduced in a faulted manner, so that the diameter of the connecting part can be reduced as much as possible without affecting the size of the connecting part, and finally the contact area of the liquid injection part and the battery can be reduced as much as possible, and the effect of reducing the residual electrolyte can be achieved.

[0020] In some embodiments, the electrolyte injection nozzle is a flexible injection nozzle, which is used to abut against the liquid injection area and is deformed under pressure.

[0021] Based on the above-mentioned embodiments of the present application, by providing the liquid injection part as a flexible injection part, the flexible structure can better fit the position of the liquid injection hole of the battery, so as to reduce the possibility of electrolyte splashing during injection due to pressure.

[0022] According to the second aspect of the present application, an injection device is provided, which comprises a housing and the above-mentioned electrolyte injection nozzle, and the electrolyte injection nozzle is directly or indirectly connected to the housing.

[0023] Based on the above-mentioned embodiments of the present application, the injection device provided by the present application comprises the above-mentioned electrolyte injection nozzle, and after the above-mentioned electrolyte injection nozzle is applied, the injection device of the present application can reduce the contact area with the battery during injection, so as to reduce the residual electrolyte, reduce the possibility of point-like overflow of residual electrolyte on the surface of the battery, and improve the yield of the battery.

[0024] In some embodiments, the injection device comprises an injection needle connected to the housing, and the end of the injection needle is at least partially inserted into the communication hole. A fixing block is formed on the injection needle, the cross-sectional size of the fixing block is larger than that of the injection needle, and the fixing block can be clamped to the fixing section.

[0025] Based on the above-mentioned embodiments of the present application, by the arrangement of the fixing block, the fixing block is clamped to the fixing section, so as to realize the quick and stable connection of the electrolyte injection nozzle and the injection needle.

[0026] Other features and advantages of the present application will be described in detail in the following specific embodiments. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the following detailed description to explain the present application, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the electrolyte injection nozzle provided in the embodiments of this application.

[0029] Figure 2 This is a cross-sectional schematic diagram of the electrolyte injection nozzle provided in the embodiments of this application.

[0030] Explanation of reference numerals in the attached figures

[0031] 1. Injection section; 11. Injection structure; 12. First cone; 13. Second cone; 2. Connecting part; 3. Communicating hole; 31. First injection section; 32. Second injection section; 33. Fixing section; 4. Step surface. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "in", "out" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "set", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the production process of power batteries, one of the steps is to inject electrolyte into the battery. In the process of mass production, professional liquid injection equipment is usually used to inject electrolyte into the battery from the injection hole.

[0039] In the prior art, the liquid injection equipment generally includes a liquid injection nozzle. The liquid injection nozzle is directly connected to the injection hole for liquid injection. At this time, in order to ensure the injection amount and the injection efficiency, the end area of the liquid injection nozzle usually needs to be set large, so that the liquid injection nozzle will be left with a lot of electrolyte after the injection is completed. The residual electrolyte may drop on the battery during the subsequent injection process, thereby causing point overflow on the surface of the battery, affecting the product yield of the battery.

[0040] In order to solve the above problems in the prior art, according to the first aspect of the present application, the electrolyte injection nozzle provided by the embodiments of the present application is provided, as shown in Figure 1 and Figure 2 The electrolyte injection nozzle includes an injection part 1 and a connecting part 2. The injection part 1 is used to connect the injection hole of the battery and perform injection, and the connecting part 2 is arranged at one end of the injection part 1 away from the injection hole. A communication hole 3 is formed on the electrolyte injection nozzle, and the communication hole 3 penetrates the injection part 1 and the connecting part 2. The end of the injection part 1 close to the injection hole is provided with an injection structure 11, the outer peripheral surface of the injection structure 11 is a tapered surface, and the size of the tapered surface gradually decreases in the direction close to the injection hole. The part close to the injection hole of the communication hole 3 is gradually contracted.

[0041] Based on the above embodiments of the present application, the electrolyte injection nozzle in specific use, by setting the outer peripheral surface of the one end of the injection part close to the electrolyte injection hole of the battery as a conical surface structure, and correspondingly setting the one end of the communication hole 3 close to the injection hole as a gradually shrinking hole diameter, and cooperating to gradually reduce the cross-sectional area of the annular structure of the electrolyte injection nozzle close to the injection hole, thereby reducing the size of the one end of the injection part 1 without affecting the electrolyte input efficiency of the injection nozzle connecting part 2, reducing the contact area of the one end of the injection part 1 with the battery, thereby reducing the residual amount of electrolyte at the contact position of the injection part 1 with the injection hole after injection, which can reduce the possibility of electrolyte gathering at the end, and realize the reduction of the electrolyte droplets falling on the surface of the battery.

[0042] Specifically, based on the above settings of the present application, the electrolyte injection nozzle of the present application in specific use is connected to the injection equipment, which is used to realize electrolyte supply and provide electrolyte injection power, wherein the connecting part 2 is directly connected to the liquid outlet part of the injection equipment to realize stable liquid supply into the electrolyte injection nozzle, and the electrolyte is injected through the communication hole 3 at one end of the connecting part 2, and then injected into the injection hole of the battery through the communication hole 3 at one end of the injection part 1.

[0043] At the same time, compared with the way of directly reducing the overall size of the electrolyte injection nozzle to reduce the contact area of the electrolyte injection nozzle with the battery, the above settings in the present application can not only reduce the contact area of the electrolyte injection nozzle with the battery, but also set the connecting part 2 to a larger size, and further set the part of the communication hole 3 located in the connecting part 2 to a larger size, thereby ensuring the electrolyte flow when the injection equipment injects liquid into the communication hole 3, and further avoiding affecting the injection efficiency of the electrolyte.

[0044] Further, in some embodiments of the present application, the injection part 1 and the connecting part 2 are two parts of the electrolyte injection nozzle, and they mainly have certain differences in function. Among them, the injection part 1 directly contacts the position of the injection hole of the battery to complete the injection, and the connecting part 2 is a connecting structure between the injection part 1 and the injection equipment. In specific structure, the injection part 1 and the connecting part 2 can be separately set and then connected, or can be integrally processed, such as integrally processed by injection molding. By integrally processing the injection part 1 and the connecting part 2, not only the production and processing efficiency can be improved, but also the connection and sealing effect between the two can be enhanced, avoiding the leakage of electrolyte and other situations.

[0045] In the present application, the electrolyte injection nozzle can be selected from any suitable material.

[0046] In an example embodiment provided in the present application, the electrolyte injection nozzle can be provided as a flexible injection nozzle. By providing the electrolyte injection nozzle as a flexible material, in specific use, a terpolymer of ethylene, propylene and non-conjugated diene, a chloroprene rubber or other organic polymer material such as polyimide, etc. can be selected. Through the above setting, on the one hand, the certain elastic property of the terpolymer of ethylene, propylene and non-conjugated diene, etc. itself is utilized to facilitate the connection of the electrolyte injection nozzle with the liquid injection equipment, and the electrolyte injection nozzle can be quickly connected through sleeving or other methods during connection. On the other hand, the electrolyte injection nozzle can be better fitted with the position of the liquid injection hole of the battery cell, and the slight compression deformation of the electrolyte injection nozzle after abutting against the position of the battery cell can be caused by the elasticity of the terpolymer of ethylene, propylene and non-conjugated diene itself, so as to improve the sealing effect of the contact position of the electrolyte injection nozzle and the liquid injection hole, thereby reducing the possibility of electrolyte splashing during liquid injection due to pressure.

[0047] Meanwhile, the terpolymer of ethylene, propylene and non-conjugated diene, etc. itself has good corrosion resistance, which can resist the corrosion of the electrolyte on the electrolyte injection nozzle, thereby prolonging the service life of the electrolyte injection nozzle. In specific use, any suitable material can be selected based on the above connection and corrosion resistance requirements, and the present application does not make specific limitations thereon.

[0048] Reference Figure 2 As shown in FIG. 3, in some embodiments of the present application, the communication hole 3 can include a first injection section 31 and a second injection section 32 in communication with each other, and the contraction part of the communication hole 3 is formed in the second injection section 32, and the cross-sectional area of the first injection section 31 is greater than that of the second injection section 32.

[0049] Based on the above embodiments of the present application, by dividing the communication hole 3 into the first injection section 31 and the second injection section 32, wherein the second injection section 32 is arranged on the side of the first injection section 31 close to the liquid injection hole of the battery cell. The contraction part of the communication hole 3 is formed in the second injection section 32 so that the end part of the second injection section 32 close to the liquid injection hole has a smaller cross-sectional area, and the outer peripheral surface formed at the end part of the liquid injection part 1 close to the liquid injection hole is a conical surface structure, so that the contact area of the electrolyte injection nozzle and the liquid injection hole of the battery cell is smaller, thereby reducing the residual electrolyte after liquid injection. At the same time, by arranging the cross-sectional area of the first injection section 31 to be greater than that of the second injection section 32, the flow of the electrolyte injected into the communication hole 3 is ensured, thereby ensuring the liquid injection efficiency.

[0050] Specifically, the first liquid injection section 31 is mainly used for connecting with the liquid injection needle and other structures to complete the input of electrolyte, so by setting the first liquid injection section 31 to have a larger cross-sectional area, the size of the liquid injection needle and other components can be correspondingly set larger, thereby ensuring the liquid injection efficiency. Meanwhile, the second liquid injection section 32 gradually reduces in size in the direction towards the liquid injection hole, thereby ensuring the connection and cooperation of the second liquid injection section 32 with the first liquid injection section 31, and also ensuring that the electrolyte injection nozzle has a smaller contact area with the battery cell. Meanwhile, the flow rate of the electrolyte increases when passing through the funnel-shaped second liquid injection section 32, thereby also ensuring higher liquid injection efficiency.

[0051] In addition, it should be noted that the application limits the cross-sectional area of the first liquid injection section 31 and the cross-sectional area of the second liquid injection section 32 in order to ensure the flow area of the communication hole 3 and the contact area between the electrolyte injection nozzle end and the battery cell, so it can be understood that the above-mentioned cross-sectional area in the application refers to the cross-sectional area formed by the cross section perpendicular to the direction of the electrolyte flow in the communication hole 3.

[0052] Further, in the application, the cross-sectional shape of the connecting portion 2, the liquid injection portion 1 and the internal communication hole 3 can be set to any suitable shape, such as a circular shape, a rectangular shape and a triangular shape, etc.

[0053] Reference Figure 2 As shown in the prior art, in an exemplary embodiment provided by the application, the connecting portion 2 can be set to a circular cylindrical structure, the liquid injection portion 1 can be set to a circular conical structure, and the cross section of the communication hole 3 can also be set to a circular shape.

[0054] Based on the above-mentioned embodiments of the application, the cross-sectional shape of the connecting portion 2, the liquid injection portion 1 and the internal communication hole 3 are all set to a circular shape, thereby increasing the flow area during liquid injection, thereby improving the liquid injection efficiency.

[0055] Specifically, by setting the external profile of the electrolyte injection nozzle and the internal communication hole 3 to a circular structure, on the one hand, the circular structure is easier to process than a prism structure, and can also avoid stress concentration around the edges during use, thereby affecting the service life, on the other hand, the area of a circular shape is the largest under the condition of a certain circumference, so under the condition of using the same material, the communication hole 3 of the circular structure can be set to have a larger flow area, thereby improving the efficiency of the electrolyte injection. At the same time, it is also more convenient to adapt to the liquid injection hole which is usually set to a circular shape.

[0056] Further, when the cross-sectional shape of the connecting portion 2, the liquid injection portion 1 and the internal communication hole 3 are all set to a circular shape, in some embodiments of the application, the diameter of the liquid injection portion 1 close to the liquid injection hole is φ1, and 5mm≤φ1≤7mm.

[0057] Based on the above embodiments of the application, by limiting the diameter of the liquid injection part 1 close to the liquid injection hole, that is, limiting the diameter of the contact surface of the liquid injection part 1 with the battery during liquid injection, the area of the contact surface of the liquid injection part 1 with the battery is avoided to be too large, which in turn causes the electrolyte residue to be too large, and further causes the point-shaped overflow of the electrolyte on the surface of the battery. In specific use, it can be selected to be set to 5mm, 5.5mm, 6mm, 6.5mm and 7mm and the like.

[0058] Further, in some embodiments of the application, the diameter of the communication hole 3 close to the liquid injection hole is φ2, 3.5mm≤φ2≤4mm.

[0059] Based on the above embodiments of the application, by limiting the diameter of the communication hole 3 close to the liquid injection hole, and cooperating with the limitation of the diameter of the liquid injection part 1 close to the liquid injection hole, the area of the annular contact area of the end of the liquid injection part 1 can be limited, and the wall thickness of the end of the liquid injection part 1 can be avoided to be affected, and the strength of the end of the liquid injection part 1 can be avoided to be affected. In specific use, it can be selected to be set to 3.5mm, 3.8mm and 4mm and the like.

[0060] At the same time, when the diameter of the communication hole 3 close to the liquid injection hole is φ2, if the size is too small, at this time the electrolyte will maintain a high flow rate when flowing through the outlet position of the communication hole 3, which will cause the injection pressure to be too large when injecting the electrolyte into the liquid injection hole of the battery, which will easily cause the electrolyte to splash out, affecting the stability during injection.

[0061] In summary, during use of the electrolyte injection nozzle, the contact area between the electrolyte injection nozzle and the battery is an annular area, at this time by limiting the diameter of the liquid injection part 1 and the corresponding communication hole 3 part at the same time, the area of the annular contact area is limited within a more appropriate range. For example, when the diameter φ1 of the liquid injection part 1 close to the liquid injection hole is set to 6mm, and the diameter φ2 of the communication hole 3 close to the liquid injection hole is set to 3.8mm at the same time, at this time the radial size of the annular contact area is 2.2mm, and the area is about 16.9mm 2 .

[0062] Further, the radial size of the annular contact area is the wall thickness of the contact end of the electrolyte injection nozzle, which can be set within a more appropriate range by the above setting of the application. If the wall thickness is too thin, the strength of the end of the electrolyte injection nozzle will be affected, which may cause liquid leakage and the like during injection.

[0063] Reference Figure 2 In some embodiments of the application, as shown in the reference, a fixed section 33 can also be arranged between the first liquid injection section 31 and the second liquid injection section 32, and the cross-sectional area of the fixed section 33 is greater than that of the first liquid injection section 31.

[0064] Based on the above-mentioned embodiments of the present application, by setting the fixed section 33, and the fixed section 33 is larger than the first liquid injection section 31 and the second liquid injection section 32, so as to facilitate the electrolyte injection nozzle and other components are connected, for example, the electrolyte injection nozzle and injection needle are connected, in the connection, the fixed section 33 can play a similar effect to the card slot, through the clamping way, the electrolyte injection nozzle and injection needle are quickly and stably connected and fixed.

[0065] Reference Figure 1 And Figure 2 As shown in the present application, in some embodiments of the present application, the injection part 1 and the connecting part 2 are formed with a step surface 4, and / or, the injection part 1 is provided with at least two sub-bodies of different sizes and is formed with a step surface 4.

[0066] Specifically, when setting, the step surface 4 structure can be formed only at the connecting position of the injection part 1 and the connecting part 2, or only on the injection part 1, or both on the injection part 1 and the connecting part 2.

[0067] Based on the above-mentioned embodiments of the present application, in the direction from the connecting part 2 to the injection part 1, the cross-sectional diameter of the electrolyte injection nozzle gradually decreases, and by forming the step surface 4, the diameter between the connecting part 2 and the injection part 1 can be reduced in a faulted manner, so as to minimize the diameter of the connecting part 2 without affecting the size of the connecting part 2, and finally minimize the contact area between the injection part 1 and the battery, and reduce the electrolyte residue.

[0068] Further, without setting the step surface 4, in order to realize the connecting part 2 to keep larger size to ensure the injection efficiency and the injection part 1 and the battery has smaller contact area, in one case, the taper surface part formed on the injection part 1 needs to be set longer in the axial direction, so as to keep the end of the injection part 1 finally contacting with the battery smaller size. In another case, the taper surface part needs to be set with larger inclination, at this time, the size difference between the two ends of the taper structure is larger. Or, the above two ways are combined, that is, the taper surface part is set with larger inclination and longer size.

[0069] In the above two manners, when the conical surface part is set to a longer size, the overall length of the liquid injection part 1 and the electrolyte injection nozzle is too long, which not only occupies a large space, but also affects the strength of the electrolyte injection nozzle as a whole, so that the liquid injection part 1 is prone to bending and deforming during use, and is prone to problems such as electrolyte leakage during electrolyte injection. When the conical surface part is set to a larger inclination, the funnel-shaped structure formed by the gradually shrinking hole diameter of the second liquid injection section 32 inside the liquid injection part 1 also needs to be set to a larger inclination, which causes the flow rate of the electrolyte to increase rapidly in the second liquid injection section 32, and eventually causes the pressure of the electrolyte to be too large when injected into the injection hole, which is prone to cause problems such as electrolyte overflow.

[0070] In this case, by setting the step surface 4 structure as described above in the present application, the step surface 4 structure is formed at the connection position of the connection part 2 and the liquid injection part 1 and on the liquid injection part 1, and the size of the electrolyte injection nozzle is reduced in a stepwise manner at the position of the step surface 4 structure, so that the connection part 2 can be set to a larger size, and the contact area of the liquid injection part 1 at the contact position with the battery cell is small, and the conical structure on the liquid injection part 1 is not too long or has too large an inclination.

[0071] Reference Figure 1 and Figure 2 In an exemplary embodiment provided in the present application, the step surface 4 structure is formed at the connection position of the connection part 2 and the liquid injection part 1 and on the liquid injection part 1, and the step surface 4 structure on the liquid injection part 1 divides the conical structure into a first cone 12 and a second cone 13, and the second cone 13 is arranged on the side of the first cone 12 facing the injection hole. In this case, when the diameter φ1 of the liquid injection part 1 near the injection hole is set to 6 mm, the diameter φ3 of the connection part 2 away from the injection hole is set to 16 mm, and the inclination angles α1 of the first cone 12 and the second cone 13 are both set to 20°, the overall length H1 of the electrolyte injection nozzle can be controlled to about 22 mm, and the length H2 of the liquid injection part 1 can be controlled to about 8 mm.

[0072] In summary, by setting the step surface 4 structure, the problem of the conical structure being too long or having too large an inclination angle can be avoided while the connection part 2 is set to a larger size and the end of the liquid injection part 1 is set to a smaller size.

[0073] In addition, by setting the step surface 4 structure, if the electrolyte splashes due to injection pressure problems during electrolyte injection, the step surface 4 structure can also play a blocking role, and the splashed electrolyte will directly impact the surface of the step surface 4 facing the injection hole, thereby avoiding the splashed electrolyte from continuing to splash outward and affecting subsequent production and processing.

[0074] On the basis of the technical solution, according to the second aspect of the present application, an electrolyte injection device is provided, which comprises a shell and the electrolyte injection nozzle.

[0075] Based on the above-mentioned embodiments of the present application, the electrolyte injection device provided by the present application comprises the electrolyte injection nozzle, and after the electrolyte injection nozzle is applied, the electrolyte injection device can reduce the contact area with the battery during injection, thereby reducing the residual electrolyte and reducing the possibility of point overflow of residual electrolyte on the surface of the battery, thereby improving the yield of the battery.

[0076] In some embodiments of the present application, the electrolyte injection device can comprise an injection needle connected to the shell, and the end of the injection needle is at least partially inserted into the communication hole 3. The injection needle is formed with a fixing block, the cross-sectional size of the fixing block is larger than that of the injection needle, and the fixing block can be clamped to the fixing section 33.

[0077] Based on the above-mentioned embodiments of the present application, through the setting of the fixing block, the fixing block is clamped to the fixing section 33, realizing the quick and stable connection of the electrolyte injection nozzle and the injection needle.

[0078] Specifically, when the injection needle is connected to the electrolyte injection nozzle, the electrolyte injection nozzle is directly sleeved on the injection needle after being expanded to a certain size by the elasticity of the electrolyte injection nozzle, and at this time, the fixing block is clamped to the fixing section 33 to avoid falling off.

[0079] In addition, it should be noted that the electrolyte injection device in the present application is not limited to the above structure, and can be set according to the injection method and the like. For example, when the injection method is selected as negative pressure injection, a negative pressure element can also be provided.

[0080] The preferred embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the specific details in the above-mentioned embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0081] In addition, it should be noted that the various specific technical features described in the above-mentioned specific embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present application will not further describe various possible combination manners.

[0082] In addition, the various different embodiments of the present application can also be combined in any manner, as long as it does not deviate from the idea of the present application, and it should also be considered as disclosed by the present application.

Claims

1. An electrolyte injection nozzle, characterized by comprising: The electrolyte injection nozzle comprises: an injection part for connecting an injection hole of a battery cell and performing injection; a connecting part provided at one end of the injection part away from the injection hole; a communication hole is provided on the electrolyte injection nozzle, and the communication hole penetrates the injection part and the connecting part; wherein one end of the injection part close to the injection hole is provided as an injection structure, the outer peripheral surface of the injection structure is a tapered surface, and the size of the tapered surface gradually decreases towards the direction close to the injection hole; the communication hole gradually shrinks in diameter close to the injection hole.

2. The electrolyte injection nozzle according to claim 1, wherein The communication hole comprises a first injection section and a second injection section in communication with each other, and the shrinkage part of the communication hole is formed in the second injection section; The cross-sectional area of the first injection section is greater than that of the second injection section.

3. The electrolyte injection nozzle according to claim 2, wherein A fixing section is further provided between the first injection section and the second injection section, and the cross-sectional area of the fixing section is greater than that of the first injection section.

4. The electrolyte injection nozzle according to any one of claims 1 to 3, characterized in that The connecting part is provided as a circular cylindrical structure, and the injection part is provided as a circular conical structure; The cross section of the communication hole is provided as a circular structure.

5. The electrolyte injection nozzle according to claim 4, wherein The diameter of the injection part close to the injection hole is φ1, and 5mm≤φ1≤7mm.

6. The electrolyte injection nozzle according to claim 4, wherein The diameter of the communication hole close to the injection hole is φ2, and 3.5mm≤φ2≤4mm.

7. The electrolyte injection nozzle of claim 1, wherein, A step surface is formed at the intersection position of the injection part and the connecting part, and / or the injection part is provided with at least two sub-bodies of different sizes and forms a step surface.

8. The electrolyte injection nozzle of claim 1, wherein, The electrolyte injection nozzle is provided as a flexible injection nozzle, which is used to abut the injection area to be injected and is deformed under pressure.

9. A liquid injection device characterized by comprising: The injection device comprises: a shell; and The electrolyte injection nozzle according to any one of claims 1-8 is directly or indirectly connected to the shell.

10. The liquid injection apparatus according to claim 9, wherein The injection device comprises an injection needle connected to the shell, and the end of the injection needle is at least partially inserted into the communication hole; A fixing block is formed on the injection needle, the cross-sectional size of the fixing block is greater than that of the injection needle, and the fixing block can be clamped in the fixing section.

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