Liquid injection device and liquid injection system

Abstract

The utility model discloses a liquid injection device and a liquid injection system, the liquid injection device comprises a liquid injection cup, a liquid injection branch pipe and a liquid injection needle, the liquid injection branch pipe is connected with the liquid injection cup, and the liquid injection branch pipe is communicated with the liquid injection cup; the liquid injection needles are connected to the ends, away from the liquid injection cups, of the liquid injection branch pipes and used for injecting liquid into the device to be injected. Each liquid injection branch pipe comprises a telescopic pipe section capable of stretching out and drawing back. Compared with the liquid injection branch pipes which are fixed in length, the liquid injection branch pipes comprise the telescopic pipe sections, by introducing the telescopic pipe sections, the liquid injection device can adjust the positions of the liquid injection needles according to different devices to be subjected to liquid injection, and therefore the liquid injection requirements of products of different specifications are met.

Description

Technical Field

[0001] This application relates to the technical field of liquid injection, and particularly relates to a liquid injection device and a liquid injection system. Background Art

[0002] In modern industrial production, liquid injection technology is widely used in multiple fields, including but not limited to battery manufacturing, pharmaceutical preparations, food processing, etc. The accuracy and safety of the liquid injection process are crucial for product quality and production efficiency.

[0003] Many existing liquid injection systems use liquid injection needles of fixed length, which may be sufficient when dealing with products of a single specification, but are not flexible enough when facing diverse product specifications. Existing liquid injection equipment is often designed for specific models of products. For different models of products, it is necessary to replace or adjust the liquid injection needles, which not only increases costs but also reduces production efficiency. Summary of the Utility Model

[0004] The main purpose of this application is to provide a liquid injection device and a liquid injection system, aiming to adapt to diverse liquid injection requirements when facing liquid injection devices of different specifications and models.

[0005] To achieve the above purpose, a liquid injection device proposed in this application includes a liquid injection cup; a liquid injection branch pipe, connected to the liquid injection cup and communicating with the liquid injection cup; a liquid injection needle, connected to the end of the liquid injection branch pipe far from the liquid injection cup, the liquid injection branch pipe communicating the liquid injection cup and the liquid injection needle, and the liquid injection needle being used to inject liquid into the device to be liquid-injected; wherein, the liquid injection branch pipe includes a telescopic pipe section.

[0006] In an optional embodiment of this application, the telescopic pipe section is arranged in a spiral shape; or the telescopic pipe section is arranged in a corrugated shape.

[0007] In an optional embodiment of this application, the telescopic pipe section includes a first telescopic section and a second telescopic section arranged coaxially, and the second telescopic section can slide relative to the first telescopic section.

[0008] In an optional embodiment of this application, the liquid injection branch pipe further includes a locking structure, which is arranged on the telescopic pipe section and is used to lock the first telescopic section and the second telescopic section.

[0009] In an optional embodiment of this application, the locking structure includes: a pressing ring, one end of which is a connecting end and the other end is an elastic locking end, the connecting end is connected to the first telescopic section, the second telescopic section passes through the locking end and extends into the first telescopic section; a fastening knob, coaxially sleeved on the pressing ring and pressing against the locking end of the pressing ring, so that the locking end squeezes the second telescopic section.

[0010] In an alternative embodiment of the present application, the telescopic pipe section further includes an elastic inner pipe, the inner pipe is arranged inside the first telescopic section and the second telescopic section, one end of the inner pipe is connected to the end of the first telescopic section away from the second telescopic section, and the other end of the inner pipe is connected to the injection needle.

[0011] In an alternative embodiment of the present application, at least a part of the injection branch pipe is a flexible pipe section, and the injection needle can rotate around the injection cup through the flexible pipe section.

[0012] In an alternative embodiment of the present application, one end of the flexible pipe section is connected to the injection cup, the other end of the flexible pipe section is connected to one end of the telescopic pipe section, and the injection needle is arranged at the end of the telescopic pipe section away from the flexible pipe section.

[0013] In an alternative embodiment of the present application, the injection device further includes a control valve, and the control valve is arranged on the injection branch pipe or on the injection needle.

[0014] The present application also provides an injection system, the injection system includes an injection device, a device to be injected, and the injection device as described above, and the injection device is arranged on the injection device.

[0015] In an alternative embodiment of the present application, the device to be injected includes a housing, and the housing is provided with an injection hole for placing the injection needle;

[0016] Wherein, there is one injection needle and one injection hole; or

[0017] There is one injection needle and multiple injection holes, and one injection needle can be placed into any one of the injection holes; or

[0018] There are multiple injection needles and one injection hole, and any one of the injection needles can be placed into the injection hole; or

[0019] There are multiple injection needles and multiple injection holes, and the number of the injection needles is the same as that of the injection holes and they correspond one by one.

[0020] In an alternative embodiment of the present application, the device to be injected further includes an electric core, and the electric core is arranged inside the housing.

[0021] The present application provides a liquid injection device. The liquid injection branch pipe includes a telescopic pipe section. The liquid injection device can adapt to various types of devices to be liquid-injected. By adjusting the telescopic pipe section, the liquid injection needle can be inserted into the liquid injection hole on the device to be liquid-injected. The telescopic pipe section allows the position of the liquid injection needle to be adjusted, ensuring an ideal distance between the liquid injection port of the liquid injection needle and the liquid injection hole of the device to be liquid-injected, thereby reducing the risk of splashing during the liquid injection process. To improve the compatibility, accuracy, and safety of the liquid injection process. By introducing a telescopic pipe section, the liquid injection device can adjust the position of the liquid injection needle according to different devices to be liquid-injected, thereby meeting the liquid injection requirements of products with different specifications. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0023] Figure 1 It is one of the schematic structural diagrams of the liquid injection device and the device to be liquid-injected in the embodiments of the present application;

[0024] Figure 2 It is another schematic structural diagram of the liquid injection device and the device to be liquid-injected in the embodiments of the present application;

[0025] Figure 3 It is the schematic structural diagram of the coaxial arrangement of the flexible pipe section and the telescopic pipe section in the embodiments of the present application;

[0026] Figure 4 It is the exploded view of the telescopic pipe section and the locking structure in the embodiments of the present application;

[0027] Figure 5 It is the cross-sectional view of the liquid injection device in the embodiments of the present application;

[0028] Figure 6 It is Figure 4 The enlarged view of part A in

[0029] Explanation of the Reference Numerals in the Drawings:

[0030] Label Name Label Name 10 Liquid injection cup 20 Liquid injection needle 30 Liquid injection branch pipe 31 Outer pipe 311 Flexible pipe section 312a, 312b Telescopic pipe section 3121 First telescopic section 3122 Second telescopic section 32 Inner pipe 33 Locking structure 331 Compression ring 332 Fastening knob 40 Device to be liquid-injected 41 Liquid injection hole

[0031] The realization of the objectives of the present application, functional features, and advantages will be further described in conjunction with the embodiments and with reference to the drawings. Detailed Embodiments

[0032] The embodiments of the present application provide a liquid injection device and a liquid injection system. It can be understood that the liquid injection system includes a liquid injection device and a device to be liquid-injected. Regarding the liquid injection device, it will be described in detail below with reference to the accompanying drawings. Among them, the liquid injection device can be applied to related fields such as lithium batteries, catering, medical treatment, real estate, and military industry, and injects liquid into the device to be liquid-injected, that is, injects liquid into the device to be liquid-injected. The liquid can also be understood as a fluid. For the convenience of understanding, the device to be liquid-injected in the embodiments of the present application takes a battery as an example for exemplary description, and the injected liquid is electrolyte injection. It should be noted that the device to be liquid-injected is not limited to batteries, and the embodiments of the present application do not limit it. For example, in other embodiments, the device to be liquid-injected can also be a container for oral liquid, and the liquid injection device can inject liquid into the container for oral liquid.

[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present application or its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0034] Referring to "embodiment" or "embodiment mode" herein means that a specific feature, structure, or characteristic described in connection with the embodiment or embodiment mode can be included in at least one embodiment of the present application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0035] With the rapid development of battery technology, the diversity and complexity of battery products in the market are increasing day by day, and the layout of liquid injection holes on the battery covers of various models varies greatly. In the key link of battery manufacturing, the precise injection of electrolyte is directly related to the final performance and safety of the battery, and its importance is self-evident. However, the fixed-length liquid injection tube structure adopted by traditional liquid injection equipment lacks effective compatibility with different battery models. Whenever the production line needs to switch to producing batteries of different specifications, it faces the dilemma of complex adjustment or even overall replacement of the liquid injection machine. This process not only interrupts the continuous operation of the production line, reduces production efficiency, but also increases additional cost expenditure and time consumption.

[0036] To solve the above problems, please refer to Figure 1, this application proposes a liquid injection device, which includes a liquid injection cup 10, a liquid injection branch pipe 30, and a liquid injection needle 20. The liquid injection branch pipe 30 is connected to the liquid injection cup 10 and is in communication with the liquid injection cup 10; the liquid injection needle 20 is connected to one end of the liquid injection branch pipe 30 away from the liquid injection cup 10. The liquid injection branch pipe 30 communicates the liquid injection cup 10 and the liquid injection needle 20, and the liquid injection needle 20 is used to inject liquid into the device 40 to be injected. Specifically, a liquid injection hole 41 is provided on the device 40 to be injected. Among them, the liquid injection branch pipe 30 includes a telescopic pipe section 312a, and the telescopic pipe section 312a is used to adjust the distance between the liquid injection needle 20 and the liquid injection hole 41 on the battery.

[0037] The liquid injection branch pipe 30 of this application includes a telescopic pipe section 312a. By controlling the telescopic length of the pipe section 312a, the depth of the liquid injection needle 20 extending into the liquid injection hole 41 of the battery is adjusted, so that a preset distance is maintained between the liquid injection port of the liquid injection needle 20 and the orifice of the liquid injection hole 41 of the battery, reducing the risk of electrolyte splashing during the injection process, improving the accuracy and safety of the liquid injection process. Moreover, the telescopic pipe section 312a can be used to adjust the distance between the liquid injection needle 20 and the liquid injection hole 41 on the battery, improving the compatibility of the liquid injection device with various battery models.

[0038] Exemplarily, please continue to refer to Figure 1 , the telescopic pipe section 312a is arranged in a spiral shape; or the telescopic pipe section 312a is arranged in a corrugated shape. In some embodiments, the telescopic pipe section 312a is in a telescopic spiral shape. A spiral pipe is a pipe arranged in a spiral shape, and its shape is similar to a spiral spring, with strong elasticity and flexibility. It can be telescoped and turned according to different needs, and its shape changes are relatively flexible. In another implementation, the telescopic pipe section 312a can adopt a corrugated pipe. The inside of the corrugated pipe is in a corrugated structure, and it can undergo elastic deformation when subjected to external forces. The corrugated pipe not only has good telescopic performance but also can withstand pressure and maintain good telescopic performance. The telescopic length of the corrugated pipe can be adjusted by the expansion and contraction of the corrugations. In yet another implementation, the overall telescopic pipe is in a spiral shape, and at the same time its pipe body is a corrugated pipe. The specific shape of the telescopic pipe section 312a is not limited.

[0039] In the specific implementation process, the telescopic pipe section 312a in a spiral shape and / or a corrugated shape can include an inner layer and an outer layer. The inner layer can be made of polyvinyl fluoride or polytetrafluoroethylene material, and the outer layer can be a stainless steel braided mesh. Polyvinyl fluoride or polytetrafluoroethylene materials have high temperature resistance, resistance to electrolyte corrosion, and excellent airtightness. Protecting the outside of the inner layer with a stainless steel braided mesh not only ensures the corrosion resistance but also enhances the pressure resistance and tensile strength of the liquid injection branch pipe 30.

[0040] Exemplarily, please refer to Figure 2 and Figure 3 In an implementation manner of the embodiment of the present application, the telescopic pipe section 312b includes a first telescopic section 3121 and a second telescopic section 3122 which are coaxially arranged. The second telescopic section 3122 can slide relative to the first telescopic section 3121 to realize the adjustable length of the telescopic pipe section 312b.

[0041] In a specific implementation process, before injecting liquid into the battery cell, first align the liquid injection needle 20 with the liquid injection hole 41 on the battery, and then extend the second telescopic section 3122 into the liquid injection hole 41 of the battery to an appropriate depth, so that the liquid injection port of the liquid injection needle 20 extends into the liquid injection hole 41 as much as possible, thereby effectively avoiding the electrolyte injected from reflecting out of the liquid injection hole 41. By adjusting the length of the telescopic pipe section 312b by axially sliding the second telescopic section 3122, it can effectively avoid the change of the angle and direction of the liquid injection needle 20 when adjusting the length of the liquid injection branch pipe 30, ensure that the liquid injection branch pipe 30 can accurately extend into the liquid injection hole 41, and ensure the accuracy and success rate of the liquid injection operation.

[0042] To ensure the stability of the telescopic pipe section 312b during the liquid injection process, please refer to Figure 4 In this embodiment, the liquid injection branch pipe 30 further includes a locking structure 33. The locking structure 33 is arranged on the telescopic pipe section 312b and is used to lock the first telescopic section 3121 and the second telescopic section 3122 after they slide relative to each other to a preset position.

[0043] Exemplarily, the locking structure 33 includes a pressing ring 331 and a fastening knob 332. One end of the pressing ring 331 is a connecting end, and the other end is an elastic locking end. The connecting end is connected to the first telescopic section 3121. The second telescopic section 3122 passes through the locking end and extends into the first telescopic section 3121; the fastening knob 332 is coaxially sleeved on the pressing ring 331 and presses against the locking end of the pressing ring 331, so that the locking end squeezes the second telescopic section 3122 to realize the locking of the first telescopic section 3121 and the second telescopic section 3122.

[0044] Exemplarily, the locking end of the pressing ring 331 can be made of materials such as polymer or synthetic resin. The locking end of the pressing ring 331 can be set to a conical shape to facilitate the fitting of the fastening knob 332. The outer surface of the pressing ring 331 is provided with an external thread, and the inner wall of the fastening knob 332 is provided with an internal thread. The fastening knob 332 and the pressing ring 331 are locked through threaded connection. In a specific implementation process, when the first telescopic section 3121 and the second telescopic section 3122 are telescoped to a preset length, the fastening knob 332 is rotated to move the fastening knob 332 from the locking end of the pressing ring 331 towards the connecting end of the pressing ring 331. During the movement, the inner wall of the fastening knob 332 presses the pressing ring 331, causing the locking end of the pressing ring 331 to move towards the axis direction of the second telescopic section 3122. When the fastening knob 332 is rotated in place, the locking end of the pressing ring 331 is pressed against the outer wall of the telescopic section, restricting the movement of the second telescopic section 3122, thereby realizing the locking of the first telescopic section 3121 and the second telescopic section 3122.

[0045] Exemplarily, in an implementation manner of the embodiment of the present application, a plurality of clamping holes are provided on the side wall of the first telescopic section 3121, and the plurality of clamping holes are arranged at intervals along the axial direction of the first telescopic section 3121. A plurality of elastic protrusions are provided on the outer wall of the second telescopic section 3122, and the plurality of elastic protrusions are arranged at intervals along the axial direction of the second telescopic section 3122. The first telescopic section 3121 is sleeved outside the second telescopic section 3122. When the first telescopic section 3121 and the second telescopic section 3122 are telescoped to a preset length, the elastic protrusions are clamped into the corresponding clamping holes to realize the locking of the first telescopic section 3121 and the second telescopic section 3122.

[0046] In this embodiment, the length of the telescopic pipe section 312b is adjustable by the structure of the relative sliding of the first telescopic section 3121 and the second telescopic section 3122. During the relative movement of the first telescopic section 3121 and the second telescopic section 3122, the sealing performance inside the telescopic pipe section 312b will be affected to a certain extent.

[0047] To solve the above problems, please continue to refer to Figure 5 and Figure 6 , in an implementation manner of the embodiment of the present application, the telescopic pipe section further includes an elastic inner pipe 32. The inner pipe 32 is arranged inside the first telescopic section 3121 and the second telescopic section 3122. One end of the inner pipe 32 is connected to the end of the first telescopic section 3121 far from the second telescopic section 3122, and the other end of the inner pipe 32 is connected to the injection needle 20.

[0048] The first telescopic section 3121 and the second telescopic section 3122 form an outer tube 31 that wraps the inner tube 32. The inner tube 32 itself has a telescopic elastic property, such as a corrugated tube. One end of the inner tube 32 is connected to the end of the first telescopic section 3121 that is far from the second telescopic section 3122, and the other end is connected to the injection needle 20.

[0049] The inner tube 32 and the injection needle 20 form a sealed injection channel. The inner tube 32 can telescope with the telescopic tube section 312b. When the telescopic tube section 312b elongates, the inner tube 32 elongates with the telescopic tube section 312b under the drive of the telescopic tube section 312b. When the telescopic tube section 312b shortens, the inner tube 32 shortens with the telescopic tube section 312b under the drive of the telescopic tube section 312b. An elastic hose is used inside the injection liquid branch pipe 30, and a telescopic tube section 312b is used outside, which not only ensures the sealing performance and length adjustability of the injection liquid branch pipe 30, but also ensures the compressive resistance of the telescopic tube, and enables the injection liquid branch pipe 30 to be stably maintained at a preset angle. The inner tube 32 includes one of a polyvinyl fluoride inner tube 32 or a polytetrafluoroethylene inner tube 32; the outer tube 31 includes a stainless steel outer tube 31.

[0050] Exemplarily, please continue to refer to Figure 3 , in an implementation manner of the embodiment of the present application, at least a part of the injection liquid branch pipe 30 is a flexible pipe section 311. The injection needle 20 can rotate around the injection cup 10 through the flexible pipe section 311, and the injection needle can be maintained at a preset position.

[0051] In a specific implementation process, the orientation of the flexible pipe section 311 can be adjusted, so that an included angle is formed between the axis of the injection needle 20 and the axis of the injection hole 41 on the battery, that is, the liquid flow direction in the injection cup 10 is different from the liquid flow direction in the injection needle 20. The electrolyte in the injection needle 20 is injected into the battery in a direction inclined with respect to the axis of the injection hole 41, reducing the resistance of the electrolyte injected into the battery inside the injection needle 20, improving the injection efficiency, and at the same time reducing the intensity of the electrolyte rebound collision, effectively avoiding electrolyte leakage.

[0052] In practical applications, the flexible pipe section 311 can adopt a universal bellows pipe. The universal bellows pipe can be composed of a 65 manganese spring steel disc spring as the main body, with a chromium-plated surface, having the gloss of stainless steel, not rusting or oxidizing. The inner lining adopts a white plastic hose and a sealing plastic part, and the pipe body can be bent arbitrarily. The telescopic tube section 312b bends a preset angle around the liquid outlet through the universal bellows pipe and can be maintained at the preset angle.

[0053] It should be emphasized that the flexible pipe section 311 and the telescopic tube section 312b can be coaxially arranged, that is, the flexible pipe section 311 and the telescopic tube section 312b are collinearly arranged, asFigure 3 As shown; a preset angle can also be formed between the telescopic pipe section 312b and the flexible pipe section 311, such as Figure 2 As shown; compared with the rigid connection between the liquid injection branch pipe 30 and the liquid injection cup 10 in the prior art, the flexible pipe section 311 in this embodiment adopts a universal bamboo joint pipe that can be bent arbitrarily, and the included angle between the axes of the liquid injection needle 20 and the liquid injection hole 41 can be adjusted, improving the compatibility of the liquid injection device. In this embodiment, the universal bamboo joint pipe is used as a specific example of the flexible pipe section 311, aiming to demonstrate its design concept and functionality, rather than the only limitation on the material of the flexible pipe section 311. In fact, the material selection of the flexible pipe section 311 is extensive, not limited to the bamboo joint pipe, and other suitable materials can be flexibly selected according to the actual application scenario, performance requirements and cost considerations.

[0054] Exemplarily, in an implementation manner of the embodiment of the present application, one end of the flexible pipe section 311 is connected to the liquid injection cup 10, the other end of the flexible pipe section 311 is connected to one end of the telescopic pipe section 312b, and the liquid injection needle 20 is arranged at the end of the telescopic pipe section 312b away from the flexible pipe section 311, and the telescopic pipe section 312b can rotate around the liquid injection cup 10 through the flexible pipe section 311.

[0055] The flexible pipe section 311 is arranged at one end of the liquid injection branch pipe 30 away from the liquid injection needle 20, which can effectively avoid interference caused by the rigidity or length limitation of the pipe section when adjusting the angle of the liquid injection needle 20. This design enables the liquid injection needle 20 to adjust the angle more independently and flexibly, improving the accuracy and efficiency of the adjustment. Thus, the angle adjustment of the liquid injection needle 20 is more convenient.

[0056] There are many types and models of existing batteries. Some batteries are provided with two liquid injection holes 41, and some batteries are provided with three liquid injection holes 41. In order to improve the injection efficiency of the electrolyte, at least two liquid outlets are provided, and the number of the liquid injection branch pipes 30 and the liquid injection needles 20 corresponds to the number of the liquid outlets. For example, for a battery to be injected with liquid having two liquid injection holes 41, two liquid outlets are provided on the liquid injection cup 10, two liquid injection branch pipes 30 are provided, and the two liquid injection branch pipes 30 and the two liquid outlets are arranged in one-to-one correspondence. The two liquid injection branch pipes 30 both form an included angle with the axis of the liquid injection cup 10, and the included angle between the two liquid injection cups 10 is less than 180 degrees. In some embodiments, please refer to Figure 3 , and the connection line between the two liquid injection holes 41 on the battery and the two liquid injection branch pipes 30 enclose an isosceles triangle. In this embodiment, the included angle between the two liquid injection branch pipes 30 is not limited.

[0057] Exemplarily, the liquid injection device further includes a control valve, and the control valve is arranged on the liquid injection branch pipe 30; or, the control valve is arranged on the liquid injection needle 20. The control valve is used to control the opening or closing of the liquid injection channel.

[0058] In a specific implementation process, when it is necessary to inject liquid into the liquid injection hole 41, the control valve is controlled to open for liquid injection. When liquid injection is not required in the liquid injection hole 41, the control valve is controlled to close. The setting of the control valve can flexibly control the opening and closing of the liquid injection channel, which is convenient to use. Moreover, when the number of liquid injection branch pipes 30 on the liquid injection device is more than the number of battery liquid injection holes 41, as long as the control valve on the idle liquid injection branch pipe 30 is controlled to close, the compatibility of the liquid injection device with various battery models can be improved.

[0059] The technical solution of this application also proposes a battery liquid injection system, including a liquid injection device, a device to be liquid-injected, and the above-mentioned liquid injection device, and the liquid injection device is arranged on the liquid injection device.

[0060] Exemplarily, the liquid injection device further includes an air storage tank, an air pump, and a liquid injection cup fixing bracket. The liquid injection cup 10 is arranged on the liquid injection cup fixing bracket, and the battery to be liquid-injected is arranged below the liquid injection cup 10. In the field of battery manufacturing, as an important structure in the production process, the existing technology of the liquid injection device is quite mature. The specific structure and specific liquid injection process of the liquid injection device will not be elaborated here.

[0061] Exemplarily, the device to be liquid-injected includes a housing and an electric core arranged inside the housing. The housing is provided with the above-mentioned liquid injection hole 41. The housing includes a hole wall for forming the liquid injection hole 41. The housing has an up-down direction, and the extending direction of the hole wall is arranged at an angle with the up-down direction, so that the injected electrolyte enters the battery obliquely, reducing the resistance of the electrolyte injected into the housing interior in the liquid injection needle 20, improving the liquid injection efficiency, and at the same time reducing the intensity of the electrolyte rebound collision, effectively avoiding electrolyte leakage.

[0062] Exemplarily, the liquid injection hole 41 includes a first liquid injection hole and a second liquid injection hole. The housing includes a first hole wall for forming the first liquid injection hole and a second hole wall for forming the second liquid injection hole, and the extending directions of the first hole wall and the second hole wall are opposite.

[0063] The first hole wall and the second hole wall with two opposite extending directions allow the liquid injection device to inject electrolyte into the housing interior from two different angles, which is beneficial to the electrolyte filling the interior space of the battery faster and more evenly, especially in the case of a complex battery shape or a larger interior space.

[0064] Among them, there is one liquid injection needle 20 and one liquid injection hole 41. The operator can set and calibrate more quickly, reducing the complexity of the operation, making the liquid injection process more concentrated and precise, reducing possible errors, and improving the accuracy.

[0065] Alternatively, there is one liquid injection needle 20 and multiple liquid injection holes 41. One liquid injection needle 20 can be placed into any one of the liquid injection holes 41, which increases the adaptability of the liquid injection system, enables it to meet different requirements for liquid injection positions, can reduce the total number of liquid injection needles 20, and thus reduces costs.

[0066] Alternatively, there are multiple liquid injection needles 20 and one liquid injection hole 41. Any one of the liquid injection needles 20 can be placed into the liquid injection hole 41. When it is necessary to replace the liquid injection needle 20 to adapt to different liquids or different specifications of liquid injection, the liquid injection needle 20 can be quickly replaced, improving production efficiency.

[0067] Alternatively, there are multiple liquid injection needles 20 and multiple liquid injection holes 41, and the number of liquid injection needles 20 is the same as that of the liquid injection holes 41 and they correspond to each other one by one.

[0068] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present application under the inventive concept of the present application, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A liquid injection device, characterized in that, Comprising: A liquid injection cup; A liquid injection branch pipe, connected to the liquid injection cup and communicating with the liquid injection cup; A liquid injection needle, the liquid injection needle being connected to one end of the liquid injection branch pipe far from the liquid injection cup, the liquid injection branch pipe communicating the liquid injection cup and the liquid injection needle, and the liquid injection needle being used for injecting liquid into a device to be liquid-injected; Wherein, the liquid injection branch pipe includes a telescopic telescopic pipe section.

2. The liquid injection device according to claim 1, wherein The telescopic pipe section is arranged in a spiral shape; or the telescopic pipe section is arranged in a corrugated shape.

3. The liquid injection device according to claim 1, wherein, The telescopic pipe section includes a first telescopic section and a second telescopic section arranged coaxially, and the second telescopic section can slide relative to the first telescopic section.

4. The liquid injection device according to claim 3, characterized in that, The liquid injection branch pipe further includes a locking structure, and the locking structure is arranged on the telescopic pipe section for locking the first telescopic section and the second telescopic section.

5. The liquid injection device according to claim 4, wherein The locking structure includes: A pressing ring, one end of the pressing ring being a connection end and the other end being an elastic locking end, the connection end being connected to the first telescopic section, and the second telescopic section passing through the locking end and extending into the first telescopic section; A fastening knob, coaxially sleeved on the pressing ring and pressing against the locking end of the pressing ring so that the locking end presses the second telescopic section.

6. The liquid injection device according to claim 3, wherein, The telescopic pipe section further includes an elastic inner pipe, and the inner pipe is arranged inside the first telescopic section and the second telescopic section. One end of the inner pipe is connected to one end of the first telescopic section far from the second telescopic section, and the other end of the inner pipe is connected to the liquid injection needle.

7. The liquid injection device according to claim 1, wherein, At least a part of the liquid injection branch pipe is a flexible pipe section, and the liquid injection needle can rotate around the liquid injection cup through the flexible pipe section.

8. The liquid injection device according to claim 7, wherein, One end of the flexible pipe section is connected to the liquid injection cup, the other end of the flexible pipe section is connected to one end of the telescopic pipe section, and the liquid injection needle is arranged at one end of the telescopic pipe section far from the flexible pipe section.

9. The liquid injection device according to any one of claims 1 to 8, characterized in that, The liquid injection device further includes a control valve, and the control valve is arranged on the liquid injection branch pipe or on the liquid injection needle.

10. A liquid injection system, characterized in that, The liquid injection system includes: A liquid injection device and a device to be liquid-injected; The liquid injection device according to any one of claims 1 to 9, and the liquid injection device is arranged on the liquid injection equipment.

11. The liquid injection system according to claim 10, wherein The device to be liquid-injected includes a housing, and the housing is provided with a liquid injection hole for placing the liquid injection needle; Wherein, there is one liquid injection needle and one liquid injection hole; or There is one liquid injection needle and multiple liquid injection holes, and one liquid injection needle can be placed into any one of the liquid injection holes; or There are multiple liquid injection needles and one liquid injection hole, and any one of the liquid injection needles can be placed into the liquid injection hole; or There are multiple liquid injection needles and multiple liquid injection holes, and the number of the liquid injection needles is the same as that of the liquid injection holes and they correspond one by one.

12. The liquid injection system according to claim 11, wherein The device to be liquid-injected further includes an electric core, and the electric core is arranged inside the housing.

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