Liquid injection device compatible with various types of cylindrical batteries and liquid injection production line

Abstract

The invention discloses a liquid injection device compatible with various types of cylindrical batteries and a liquid injection production line, the device comprises a support, the support is provided with a liquid injection mechanism and a first cup body with a downward opening, the liquid injection mechanism comprises a vacuumizing assembly, a positive pressure liquid injection assembly, a liquid discharge needle nozzle and a sealing ring used for sealing a liquid injection hole, the top of the first cup body is provided with a threaded through hole used for being in threaded connection with a threaded connection column of the cylindrical battery, the threaded connection column is provided with a liquid injection hole, the side wall of the first cup body is provided with threads, and the first cup body is connected with the side wall of the second cup body with an upward opening through the threads. The size of the containing cavity of the second cup body is matched with the outer diameter of the cylindrical battery so that the cylindrical battery can be detachably fixed. According to the liquid injection device, liquid injection connection is achieved through threaded connection of the first cup body and the second cup body, the second cup body can be adaptively replaced according to the type of the cylindrical lithium battery, compatibility is high, the remodeling cost is low, and remodeling steps are simple.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing, and in particular to a liquid injection device and a liquid injection production line that are compatible with cylindrical batteries of various models. Background Art

[0002] With the development and needs of the entire new energy industry, cylindrical lithium batteries (hereinafter referred to as batteries, cylindrical batteries or cylindrical lithium batteries, etc.) are widely popular for their excellent safety performance. Cylindrical battery models have been continuously developed and updated, and there are many models. The existing cylindrical lithium battery filling machines on the market have poor model compatibility, especially for high-capacity cylindrical lithium batteries with high vacuum / high positive pressure filling methods. In addition, the workload of changing the filling device according to different models of cylindrical batteries is large and the cost is high. In view of this, it is necessary to provide a filling device and production line that is compatible with multiple models of cylindrical lithium batteries, has simple replacement steps, and low replacement costs. Summary of the invention

[0003] The purpose of the present invention is to provide a liquid injection device and a liquid injection production line that are compatible with various types of cylindrical batteries, aiming to solve the problems that the current liquid injection device and production line for cylindrical batteries have to be improved in compatibility with cylindrical lithium-ion battery models, the model change steps are complicated, and the model change cost is high.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a liquid injection device that is compatible with various types of cylindrical batteries, including a bracket, on which a liquid injection mechanism and a first cup body with an opening facing downward are provided, the liquid injection mechanism includes a vacuum assembly, a positive pressure liquid injection assembly, a liquid lowering needle nozzle and a sealing ring for sealing the liquid injection hole, the top of the first cup body is provided with a threaded through hole for threadedly connecting a screw column of the cylindrical battery, the screw column is provided with a liquid injection hole that passes from the top of the screw column to the bottom, the side wall of the first cup body is threadedly connected to the side wall of the second cup body with an opening facing upward, and the size of the cavity of the second cup body is adapted to the outer diameter of the cylindrical battery for detachably fixing the cylindrical battery.

[0005] In a preferred embodiment, the cavity of the second cup body is cylindrical, and a ring is provided on the inner surface of the second cup body. The size of the ring is adapted to the outer diameter of the cylindrical battery so as to achieve detachable fixation of the cylindrical battery.

[0006] In a preferred embodiment, the side wall of the first cup body is provided with threads, specifically, the outer side wall of the first cup body is provided with threads.

[0007] In a preferred embodiment, the sealing ring is sleeved on the liquid discharge needle nozzle.

[0008] In a preferred embodiment, the bracket includes a mounting plate, the mounting plate is provided with a first through hole for passing the liquid discharge needle nozzle and the sealing ring, and the first cup body is fixed on the mounting plate.

[0009] In a preferred embodiment, the bracket further comprises a bottom plate and a support column mounted on the bottom plate, the mounting plate is mounted on the support column, and the second cup body is located above the bottom plate.

[0010] In a preferred embodiment, the upper surface of the first cup body is connected to the lower surface of the mounting plate.

[0011] In a preferred embodiment, the positive pressure liquid injection component includes a gas-liquid chamber, a gas-liquid through tube connected to the gas-liquid chamber, a high-pressure nitrogen valve arranged on the gas-liquid chamber, an injection valve arranged on the gas-liquid chamber, and a liquid lowering valve arranged on the gas-liquid through tube; the liquid lowering needle nozzle connects the gas-liquid through tube and the vacuum pumping component.

[0012] In a preferred embodiment, the vacuum pump assembly includes a vacuum valve, a vacuum pump and a vacuum tube. The vacuum valve is located on the vacuum tube. One end of the vacuum tube is connected to the gas-liquid via the tube and the other end is connected to the vacuum pump.

[0013] The present invention also provides a battery liquid injection production line, which includes the liquid injection device that is compatible with various types of cylindrical batteries.

[0014] Compared with the prior art, the beneficial effects of the present invention, a liquid injection device and a liquid injection production line compatible with various types of cylindrical batteries, are as follows: the present invention designs a first cup body for threaded connection of the threaded through hole of the screw connection column of the cylindrical battery, the size of the cavity of the two cup bodies is adapted to the outer diameter of the cylindrical battery to achieve the basic fixation of the cylindrical battery, and the connection of liquid injection is achieved by threaded connection of the first cup body and the second cup body. With such a design, the second cup body can be adaptively replaced according to the model of the cylindrical lithium battery, and the compatibility is high; only the second cup body needs to be replaced, the cost is low, and the replacement steps are simple.

[0015] In order to make the above-mentioned objects, features and advantages of the invention more obvious and easy to understand, the preferred embodiments of the present invention are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A structural diagram of a liquid injection device provided by the present invention that is compatible with various types of cylindrical batteries;

[0018] Figure 2 A partial structural diagram of a liquid injection device provided by the present invention that is compatible with various types of cylindrical batteries;

[0019] Figure 3 A schematic structural diagram of the second cup body provided by the present invention.

[0020] Explanation of the reference numerals: 100, liquid injection device, 10, first cup body, 101, threaded through hole, 20, second cup body, 201, ring, 30, bracket, 301, mounting plate, 302, bottom plate, 303, support column, 40, liquid injection mechanism, 401, liquid lowering needle nozzle, 4021, gas-liquid chamber, 4022, gas-liquid passing tube, 4023, high-pressure nitrogen valve, 4024, liquid injection valve, 4025, liquid lowering valve, 4031, vacuum valve, 404, sealing ring. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0022] In an embodiment of the present invention, a liquid injection device 100 is provided that is compatible with various types of cylindrical batteries.

[0023] Please refer to Figure 1 and Figure 2The injection device 100 comprises a bracket 30, an injection mechanism 40, a first cup body 10 and a second cup body 20. The bracket 30 is provided with an injection mechanism 40 and a first cup body 10, the first cup body 10 is opened downward, the injection mechanism 40 comprises a vacuum assembly, a positive pressure injection assembly, a liquid lowering needle nozzle 401 and a sealing ring 404 for sealing the injection hole, the top of the first cup body 10 is provided with a threaded through hole 101, the threaded through hole 101 is used to thread the screw connection column of the cylindrical battery, the screw connection column is provided with an injection hole that passes from the top of the screw connection column to the bottom, the side wall of the first cup body 10 and the side wall of the second cup body 20 are both provided and correspondingly provided with threads, the side wall of the first cup body 10 is threadedly connected to the side wall of the second cup body 20 opened upward, and the size of the cavity of the second cup body 20 is adapted to the outer diameter of the cylindrical battery for detachably fixing the cylindrical battery.

[0024] In this embodiment, the vacuum pumping component and the positive pressure injection component are both located on the bracket 30, the lower liquid needle nozzle 401 is connected and communicates the vacuum pumping component and the positive pressure injection component, and the sealing ring 404 is arranged on the vacuum pumping component, the positive pressure injection component or the lower liquid needle nozzle 401. In a specific embodiment, the sealing ring 404 is arranged on the lower liquid needle nozzle 401.

[0025] It can be understood that the connection between the first cup body 10 and the second cup body 20 is cylindrical, but the overall shape of the first cup body 10 and the second cup body 20 is not limited to being cylindrical. Preferably, in order to facilitate the detachable threaded connection between the first cup body 10 and the second cup body 20, the first cup body 10 and the second cup body 20 are both cylindrical in shape.

[0026] In this embodiment, the cavity of the second cup body 20 is cylindrical.

[0027] Here, the cylindrical battery is stuck in the cavity of the second cup body 20 through the size relationship between the cavity and the cylindrical battery. The second cup body 20 supports the cylindrical battery. If it needs to be disassembled, a certain disassembly pulling force can be applied. Figure 3 In this embodiment, a ring 201 is provided in the second cup body 20, and the ring 201 is attached to the inner surface of the second cup body 20. The size of the ring 201 is adapted to the outer diameter of the cylindrical battery to achieve detachable fixation of the cylindrical battery.

[0028] It can be understood that the above-mentioned ring 201 can be replaced with other structures, such as a plurality of protrusions.

[0029] In this embodiment, the opening of the first cup body 10 and the opening of the second cup body 20 are arranged correspondingly. The thread on the side wall of the first cup body 10 is located on the outer wall of the first cup body 10, and the thread on the side wall of the second cup body 20 is located on the inner wall of the second cup body 20. The connection position relationship can be seen in Figure 2 .

[0030] Preferably, the length of the thread of the side wall of the first cup body 10 is greater than the length of the thread of the second cup body 20 .

[0031] See also Figure 1 In this embodiment, the bracket 30 includes a mounting plate 301, and the mounting plate 301 is provided with a first through hole for passing the liquid needle nozzle 401 and the sealing ring 404, and the first cup body 10 is fixed on the mounting plate 301. The number of corresponding first through holes on the mounting plate 301 is not limited, and each first through hole specifically corresponds to a liquid injection position, that is, corresponds to a liquid injection mechanism 40, the first cup body 10 and the second cup body 20.

[0032] Please see again Figure 1 The bracket 30 also includes a bottom plate 302 and a support column 303 installed on the bottom plate 302 , the mounting plate 301 is installed on the support column 303 , and the second cup body 20 is located above the bottom plate 302 .

[0033] Specifically, the upper surface of the first cup body 10 is connected to the lower surface of the mounting plate 301, such as Figure 1 As described, the second cup body 20 is located between the bottom plate 302 and the mounting plate 301 .

[0034] Here, the positive pressure liquid injection component includes a gas-liquid chamber 4021, a gas-liquid through tube 4022 connected to the gas-liquid chamber 4021, a high-pressure nitrogen valve 4023 arranged on the gas-liquid chamber 4021, an injection valve 4024 arranged on the gas-liquid chamber 4021, and a lower liquid valve 4025 arranged on the gas-liquid through tube 4022.

[0035] The liquid lowering needle nozzle 401 is connected to the gas-liquid passing tube 4022 and the vacuum pumping assembly. The lower end (liquid and gas outlet end) of the liquid lowering needle nozzle 401 can be located in the liquid injection hole. When the screw connection column is threadedly connected to the first cup body 10, the lower end of the liquid lowering needle nozzle 401 can be located in the liquid injection hole. It can be that when the screw connection column thread is gradually connected to the first cup body 10, the lower end of the liquid lowering needle nozzle 401 enters the liquid injection hole accordingly, or after the screw connection column thread is connected to the first cup body 10, the liquid lowering needle nozzle 401 moves downward so that the lower end of the liquid lowering needle nozzle 401 enters the liquid injection hole accordingly. Similarly, the situation where separation is achieved by rotation can be known.

[0036] The vacuum pump assembly includes a vacuum valve 4031, a vacuum pump and a vacuum tube. The vacuum valve 4031 is used to control whether the vacuum pump vacuumizes the cylindrical battery through the liquid needle nozzle 401. The vacuum valve 4031 is located on the vacuum tube, one end of the vacuum tube is connected to the gas-liquid through the tube 4022 and the other end is connected to the vacuum pump.

[0037] In this embodiment, when the injection mechanism 40 enters the injection hole, the sealing ring 404 is arranged between the lower liquid tube and the injection hole, and the sealing of the injection hole is achieved by the sealing ring 404 and the lower liquid needle nozzle 401. Here, the sealing ring 404 is located on the lower liquid needle nozzle 401, specifically on the lower half, and here, a groove is provided on the side wall of the lower liquid needle nozzle 401, and the sealing ring 404 is located in the groove.

[0038] The working process of the present invention is as follows: when liquid injection is required, it is determined that the second cup body 20 is not connected to the first cup body 10, and a suitable second cup body 20 is selected according to the model or size of the cylindrical battery, and the cylindrical battery is placed in the second cup body 20, and the second cup body 20 is rotated. By rotating the second cup body 20 and the first cup body 10, a threaded connection is achieved. In this process, the threaded connection between the screw column and the threaded through hole 101 is naturally achieved, and the liquid injection mechanism 40 (the lower liquid needle nozzle 401) is also achieved. The liquid injection port is sealed (the lower liquid needle nozzle 401 and the sealing ring 404), and then the liquid injection and other operations are performed. After completion, the second cup body 20 is rotated to separate the second cup body 20 from the first cup body 10. The cylindrical battery after liquid injection is directly taken out from the second cup body 20 cavity.

[0039] Combined with the above detailed description of the specific implementation of the present invention, it can be seen that, compared with the prior art, the present invention designs a second cup body 20 that can be adaptively replaced according to the model of the cylindrical lithium battery. The other devices of the present invention do not need to be replaced. When the second cup body 20 and the first cup body 10 are connected, the connection between the screw connection column and the threaded through hole 101 of the first cup body 10 can be realized synchronously, thereby realizing the direct connection between the injection mechanism 40 and the battery injection hole. The connection and disassembly method is simple and easy to operate; by only adjusting the design of the second cup body 20 according to the model of the cylindrical battery, the compatibility cost of the injection device 100 of the present invention is low, and the compatible replacement is simple; the present invention has high compatibility, and the injection device 100 can adapt to positive pressure / vacuum injection of various models of cylindrical lithium batteries by designing a large-sized first cup body 10 and designing a second cup body 20 of various cavity sizes. The present invention has a vacuum / high positive pressure injection method, and its injection effect is good.

[0040] The present invention also provides a battery filling production line, which includes a filling device 100 compatible with various types of cylindrical batteries in any of the above embodiments. It can be understood that after the production line adopts the above filling device 100, it is suitable for the filling production of various circular lithium batteries. When the battery is changed, the production line is easy to adapt and only the second cup body 20 needs to be changed, and the change cost is low.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as described in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A liquid injection device compatible with various types of cylindrical batteries, characterized in that: It comprises a bracket, on which a liquid injection mechanism and a first cup body with an opening facing downward are provided, the liquid injection mechanism comprises a vacuum assembly, a positive pressure liquid injection assembly, a liquid lowering needle nozzle and a sealing ring for sealing the liquid injection hole, the top of the first cup body is provided with a threaded through hole for threadedly connecting a screw column of a cylindrical battery, the screw column is provided with a liquid injection hole extending from the top of the screw column to the bottom, the side wall of the first cup body is threadedly connected to the side wall of a second cup body with an opening facing upward, the size of the cavity of the second cup body is adapted to the outer diameter of the cylindrical battery for detachably fixing the cylindrical battery.

2. A liquid injection device compatible with various types of cylindrical batteries as claimed in claim 1, characterized in that: The cavity of the second cup body is cylindrical, and a ring is provided on the inner surface of the second cup body. The size of the ring is adapted to the outer diameter of the cylindrical battery so as to achieve detachable fixing of the cylindrical battery.

3. A liquid injection device compatible with various types of cylindrical batteries as claimed in claim 1, characterized in that: The side wall of the first cup body is provided with threads, specifically, the outer side wall of the first cup body is provided with threads.

4. A liquid injection device compatible with various types of cylindrical batteries as claimed in claim 1, characterized in that: The sealing ring is sleeved on the lower liquid needle nozzle.

5. The liquid injection device compatible with various types of cylindrical batteries as claimed in claim 1, characterized in that: The bracket comprises a mounting plate, the mounting plate is provided with a first through hole for passing the liquid discharge needle nozzle and the sealing ring, and the first cup body is fixed on the mounting plate.

6. A liquid injection device compatible with various types of cylindrical batteries as claimed in claim 5, characterized in that: The bracket also includes a bottom plate and a support column installed on the bottom plate, the mounting plate is installed on the support column, and the second cup body is located above the bottom plate.

7. A liquid injection device compatible with various types of cylindrical batteries as claimed in claim 5, characterized in that: The upper surface of the first cup body is connected to the lower surface of the mounting plate.

8. The liquid injection device compatible with various types of cylindrical batteries as claimed in claim 1, characterized in that: The positive pressure liquid injection component includes a gas-liquid chamber, a gas-liquid through tube connected to the gas-liquid chamber, a high-pressure nitrogen valve arranged on the gas-liquid chamber, an injection valve arranged on the gas-liquid chamber, and a lower liquid valve arranged on the gas-liquid through tube; the lower liquid needle nozzle connects the gas-liquid through tube and the vacuum pumping component.

9. A liquid injection device compatible with various types of cylindrical batteries as claimed in claim 8, characterized in that: The vacuum pump assembly comprises a vacuum valve, a vacuum pump and a vacuum tube. The vacuum valve is located on the vacuum tube. One end of the vacuum tube is connected to the gas-liquid through-tube and the other end is connected to the vacuum pump.

10. A battery injection production line, characterized in that: The battery filling production line comprises a filling device according to any one of claims 1 to 9 that is compatible with various types of cylindrical batteries.

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