Liquid injection blowout prevention mechanism and liquid injection device

Abstract

The utility model discloses a liquid injection blowout prevention mechanism and a liquid injection device, the liquid injection blowout prevention mechanism comprises a liquid injection piece and a one-way assembly, the liquid injection piece is provided with a liquid injection channel, and an upper opening and a lower opening which are communicated with the liquid injection channel; the one-way assembly is arranged in the liquid injection channel, the one-way assembly has a conducting state and a closing state, in the conducting state, the one-way assembly allows the electrolyte to enter the liquid injection channel through the upper opening and flow to the lower opening, and in the closing state, the one-way assembly blocks the electrolyte from flowing in the liquid injection channel. Compared with the prior art, the battery is provided with the one-way assembly, under the action of hydraulic pressure, the one-way assembly can be in a conducting state, electrolyte is injected into the battery through the liquid injection channel, after liquid injection is completed, the hydraulic pressure disappears, and meanwhile, due to micro-positive pressure in the battery, the one-way assembly is subjected to acting force in the direction opposite to the hydraulic pressure; the closed state is recovered, the electrolyte is prevented from flowing, and the electrolyte is prevented from being sprayed out from the electrolyte injection part.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a liquid injection anti-spray mechanism and liquid injection device. Background Technology

[0002] In the current battery production process, after the battery cell is installed, an electrolyte needs to be injected into the cell. The electrolyte acts as a medium for ion transport. The positive and negative electrode materials of the battery undergo chemical reactions during charging and discharging, and the charge needs to be transferred through ions in the electrolyte, thereby realizing the charging and discharging function of the battery.

[0003] Typically, the electrolyte injection needle is inserted into the battery's injection hole, and then the electrolyte is injected into the needle using an injection machine. After the electrolyte injection is completed, because the inside of the cell is under a slightly positive pressure, the internal pressure of the cell will release to the outside the moment the injection machine is withdrawn. If the electrolyte level is too close to the surface of the injection hole during the pressure release process, the electrolyte can easily spray from the injection hole onto the injection needle and out of the injection needle, polluting the external environment of the battery and affecting the insulation resistance performance, appearance, and welding yield of the sealing pins at the cell terminals. Utility Model Content

[0004] One objective of this invention is to provide an anti-spray mechanism and a liquid injection device, which aims to solve the technical problem that the electrolyte will spray out or overflow from the injection needle after the liquid injection is completed.

[0005] To achieve the above objectives, the present invention provides a solution: a liquid injection anti-blowout mechanism, which includes an injection component and a one-way component. The injection component has an injection channel and an upper opening and a lower opening communicating with the injection channel. The one-way component is disposed in the injection channel and has a conducting state and a closed state. In the conducting state, the one-way component allows electrolyte to enter the injection channel through the upper opening and flow to the lower opening. In the closed state, the one-way component blocks the flow of electrolyte in the injection channel.

[0006] Optionally, the injection channel includes a first channel and a clearance channel that are interconnected. The first channel is located at the end of the clearance channel near the upper opening, and the diameter of the clearance channel is larger than that of the first channel. The unidirectional component includes an isolator disposed in the clearance channel. In the closed state, the isolator abuts against the connection between the first channel and the clearance channel and blocks the first channel. In the open state, the isolator remains in the clearance channel, and the clearance channel and the first channel are in a connected state.

[0007] Optionally, the injection channel further includes a second channel located at the end of the clearance channel away from the first channel, and the diameter of the clearance channel is larger than that of the second channel; the unidirectional component further includes a reset member, one end of which is connected to the isolator and the other end of which is connected to the injection member, and the reset member is used to push the isolator against the connection between the first channel and the clearance channel; wherein, in the conducting state, the reset member is used to maintain the isolator in the clearance channel.

[0008] Optionally, the extension and the peripheral wall of the second channel slide against each other.

[0009] Optionally, the injection component is provided with an auxiliary channel, which is connected to the end of the second channel near the lower opening and the avoidance channel.

[0010] Optionally, the injection anti-blowout mechanism includes a fixing plate, which is disposed in the injection component and spans the second channel. The fixing plate has a clearance hole communicating with the second channel. The injection component is connected to the reset component through the fixing plate.

[0011] Optionally, the injection component includes an injection head and a connector. The injection head has a lower opening, and the connector has an upper opening. The injection channel passes through the injection head and the connector. The injection head and the connector are threadedly connected, and the injection head and the connector clamp the fixing plate.

[0012] Optionally, in the direction away from the avoidance channel, at least a portion of the diameter of the first channel gradually increases.

[0013] Optionally, a chamfer is provided at the connection between the first channel and the avoidance channel, and the peripheral surface of the isolation member gradually tapers away from the lower opening, and the peripheral surface of the isolation member is used to abut against the chamfer.

[0014] To achieve the above objectives, the present invention provides a solution: a liquid injection device, which includes: a liquid injection anti-blowout mechanism of any of the above-mentioned methods and a liquid injection machine, wherein the upper opening of the liquid injection machine and the liquid injection anti-blowout mechanism are connected.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a liquid injection anti-spray mechanism and a liquid injection device. The liquid injection anti-spray mechanism includes an injection component and a one-way component. The injection component has an injection channel and an upper opening and a lower opening communicating with the injection channel. The one-way component is disposed in the injection channel and has a conducting state and a closed state. In the conducting state, the one-way component allows the electrolyte to enter the injection channel through the upper opening and flow to the lower opening. In the closed state, the one-way component blocks the flow of electrolyte in the injection channel. Compared with the prior art, this application provides a one-way component. Under the action of hydraulic pressure, the one-way component can be in the conducting state, and the electrolyte is injected into the battery through the injection channel. When the liquid injection is completed, the hydraulic pressure disappears. At the same time, because there is a slight positive pressure inside the battery, which acts oppositely to the hydraulic pressure, the one-way component is subjected to a force in the opposite direction to the hydraulic pressure, which can restore it to the closed state, blocking the flow of electrolyte and effectively preventing electrolyte from spraying out of the injection component. The electrolyte injection device with this anti-spray mechanism can close the injection channel when the injection machine is removed, preventing electrolyte from spraying out of the injection unit and polluting the battery environment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the closed state of the liquid injection anti-blowout mechanism provided in this embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the conduction state of the liquid injection anti-blowout mechanism provided in this embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the liquid injection anti-blowout mechanism provided in this embodiment of the utility model;

[0020] Figure 4 This is another structural schematic diagram of the liquid injection anti-spray mechanism provided in this embodiment of the utility model. Reference numerals are explained as follows: 10, injection component; 101, injection channel; 102, upper opening; 103, lower opening; 1011, first channel; 1012, clearance channel; 1013, second channel; 1014, chamfer; 104, auxiliary channel; 105, injection head; 106, connector; 20, one-way component; 201, isolator; 202, reset component; 2011, plug; 2012, transition portion; 2013, extension portion; 2014, through hole; 2015, assembly cavity; 30, fixing plate; 301, clearance hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 The present invention provides an electrolyte injection device, which includes an electrolyte injection anti-blowout mechanism and an electrolyte injection machine (not shown in the figure). The electrolyte injection machine and the electrolyte injection anti-blowout mechanism are connected. The electrolyte injection anti-blowout mechanism is connected to the electrolyte injection hole of the battery. The electrolyte injection machine injects electrolyte into the battery through the electrolyte injection anti-blowout mechanism.

[0023] Please refer to it again. Figure 1 The aforementioned liquid injection anti-blowout mechanism includes a liquid injection component 10 and a one-way component 20. The liquid injection component 10 has a liquid injection channel 101 and an upper opening 102 and a lower opening 103 communicating with the liquid injection channel 101. The one-way component 20 is disposed in the liquid injection channel 101 and has a conducting state and a closed state. In the conducting state, the one-way component 20 allows the electrolyte to enter the liquid injection channel 101 through the upper opening 102 and flow to the lower opening 103. In the closed state, the one-way component 20 blocks the flow of electrolyte in the liquid injection channel 101.

[0024] In practical applications, the upper opening 102 of the liquid injection machine and the liquid injection component 10 are connected, and the lower opening 103 of the liquid injection component 10 is connected to the liquid injection hole of the battery. The lower opening 103 of the liquid injection component 10 can be partially inserted into the liquid injection hole and abut against the battery to maintain the connection stability of the liquid injection component 10. A one-way component 20 is provided inside the liquid injection component 10. The one-way component 20 is used to control the opening and closing of the liquid injection channel 101. For example, during liquid injection, the liquid injection machine injects electrolyte into the liquid injection channel 101. The electrolyte injection has a certain liquid pressure. Under the action of liquid pressure, the one-way component 20 can be in the conducting state. The electrolyte is injected into the battery through the liquid injection channel 101. When the liquid injection is completed, the liquid pressure disappears. At the same time, since there is a slight positive pressure inside the battery, the slight positive pressure is opposite to the liquid pressure. The one-way component 20 is subjected to a force in the opposite direction to the liquid pressure and can return to the closed state, blocking the flow of electrolyte and effectively preventing electrolyte from spraying out of the liquid injection component 10.

[0025] Please see Figure 2The injection channel 101 includes a first channel 1011 and a clearance channel 1012 connected in sequence. The first channel 1011 is located at the end of the clearance channel 1012 near the upper opening 102, and the diameter of the clearance channel 1012 is larger than that of the first channel 1011. The unidirectional component 20 includes an isolator 201 disposed in the clearance channel 1012. In the closed state, the isolator 201 abuts against the connection between the first channel 1011 and the clearance channel 1012 and blocks the first channel 1011. In the open state, the isolator 201 remains in the clearance channel 1012, and the clearance channel 1012 and the first channel 1011 are in a connected state.

[0026] In practical applications, the first channel 1011 can have an upper opening 102, which is connected to the liquid injection machine, and a lower opening 103, which is connected to the liquid injection hole of the battery. The separator 201 is movably disposed in the liquid injection channel 101. Specifically, when no liquid is injected, that is, in the initial state, the separator 201 is partially located at the connection between the first channel 1011 and the avoidance channel 1012 to isolate the first channel 1011 and the avoidance channel 1012 and prevent the electrolyte from entering the avoidance channel 1012. When liquid is injected, the liquid injection machine injects electrolyte into the first channel 1011. Due to the hydraulic pressure, the separator 201 moves in the first direction in the liquid injection channel 101 until the first channel 1011 and the avoidance channel 1012 are connected. At this time, the electrolyte can enter the avoidance channel 1012 and enter the battery from the lower opening 103.

[0027] After the electrolyte injection is completed, the operator removes the injection machine. The liquid pressure disappears, and there is a slight positive pressure inside the battery. Since the slight positive pressure inside the battery acts in the opposite direction to the liquid pressure, the separator 201 will move in the second direction under this force, returning it to its initial state and closing the injection channel 101 again. This effectively prevents the electrolyte from being sprayed out of the injection device 10 due to the slight positive pressure inside the battery.

[0028] It should be noted that the first direction and the second direction represent two opposite directions, and the movement of the isolator 201 can be linear movement; in other embodiments, the movement of the isolator 201 can also be rotation or other movement modes.

[0029] Furthermore, the diameter of the clearance passage 1012 is larger than that of the first passage 1011. Therefore, a step is formed at the connection between the clearance passage 1012 and the first passage 1011. The step can abut against the isolation member 201 so that the isolation member 201 can better block the connection between the clearance passage 1012 and the first passage 1011.

[0030] Please refer to it again. Figure 2The injection channel 101 also includes a second channel 1013, which is located at the end of the avoidance channel 1012 away from the first channel 1011. The diameter of the avoidance channel 1012 is larger than that of the second channel 1013. The unidirectional component 20 also includes a reset member 202, one end of which is connected to the isolator 201 and the other end of which is connected to the injection component 10. The reset member 202 is used to push the isolator 201 against the connection between the first channel 1011 and the avoidance channel 1012 and to block the first channel 1011. In the conducting state, the reset member 202 is used to maintain the isolator 201 in the avoidance channel 1012.

[0031] In practical applications, the first channel 1011 can have an upper opening 102, and the second channel 1013 can have a lower opening 103. The upper opening 102 is connected to the liquid injection machine, and the lower opening 103 is connected to the liquid injection hole of the battery. The isolator 201 is slidably disposed in the liquid injection channel 101. The reset member 202 is connected to both the isolator 201 and the liquid injection member 10, and is used to push the isolator 201 to reset. When no liquid is injected, the isolator 201 is partially located at the connection between the first channel 1011 and the avoidance channel 1012 to isolate the first channel 1011 and the avoidance channel 1012. 12. Blocking electrolyte from entering the clearance channel 1012. At this time, the reset member 202 is usually in a natural state or a pre-compressed state. During the injection, the injector injects electrolyte into the first channel 1011. Due to the hydraulic pressure, the isolator 201 moves in the first direction within the injection channel 101 until the first channel 1011 and the clearance channel 1012 are connected. At this time, the electrolyte can enter the clearance channel 1012 and enter the battery through the second channel 1013. The movement of the isolator 201 causes the reset member 202 to be displaced or deformed.

[0032] After the electrolyte injection is completed, the operator removes the injection machine, the liquid pressure disappears, and the battery has a slight positive pressure. Simultaneously, the reset component 202 has a certain reset function. Since the slight positive pressure inside the battery and the reset effect of the reset component 202 are both opposite to the direction of the liquid pressure, under this force, the isolator 201 will move in the second direction, returning to its initial state and closing the injection channel 101 again. This effectively prevents the electrolyte from spraying out of the injection component 10 due to the slight positive pressure inside the battery. The reset component 202 changes the pressure threshold at which the electrolyte pushes the isolator 201 in the opposite direction, allowing the isolator 201 to return to its initial state more quickly and close the injection channel 101 the instant the injection machine is removed and the injection pressure disappears.

[0033] Furthermore, the diameter of the clearance channel 1012 is larger than that of the second channel 1013, which allows the clearance channel 1012 to store more electrolyte so that the electrolyte can continuously flow to the second channel 1013 and then to the battery, thereby improving the electrolyte injection efficiency.

[0034] It should be noted that when the movement of the isolator 201 is linear, the reset member 202 can adopt an elastic structure such as a spring; in other embodiments, the movement of the isolator 201 can also be rotation, in which case the reset member 202 can adopt an elastic structure such as a torsion spring.

[0035] Please see Figure 3 The isolation component 201 includes a plug 2011, a transition portion 2012, and an extension portion 2013 connected in sequence. The plug 2011 is used to abut against the connection between the first channel 1011 and the avoidance channel 1012 and to block the first channel 1011. The extension portion 2013 is assembled in the second channel 1013 and has an assembly cavity 2015. The reset component 202 is assembled in the assembly cavity 2015 and is connected to the liquid injection component 10. The transition portion 2012 has a through hole 2014 that connects the assembly cavity 2015 and the avoidance channel 1012.

[0036] In practical applications, the isolator 201 can move linearly within the injection channel 101. The isolator 201 includes a plug 2011, a transition portion 2012, and an extension portion 2013. When no liquid is injected, the plug 2011 blocks the connection between the first channel 1011 and the clearance channel 1012. The transition portion 2012 is located within the clearance channel 1012. The extension portion 2013 is at least partially located within the second channel 1013. The reset member 202 is assembled within the assembly cavity 2015 of the extension portion 2013, and the assembly cavity 2015 communicates with the lower opening 103. When liquid is injected, the hydraulic pressure pushes the plug 2011 to move. The plug 2011 is away from the connection between the first channel 1011 and the clearance channel 1012. At this time, the first channel 1011 and the clearance channel 1012 are connected. At the same time, since the transition part 2012 has a through hole 2014 that connects the assembly cavity 2015 and the clearance channel 1012, the clearance channel 1012 is also connected to the assembly cavity 2015 after the first channel 1011 and the clearance channel 1012 are connected. Therefore, the electrolyte can flow from the first channel 1011 through the clearance channel 1012 and the assembly cavity 2015 in sequence, and finally be injected into the battery from the lower opening 103.

[0037] The transition section 2012 has a through hole 2014. After the plug 2011 connects the first channel 1011 and the avoidance channel 1012, the electrolyte is directly introduced into the lower opening 103 of the second channel 1013 through the through hole 2014. The plug 2011 only needs to move a short distance to quickly connect the flow channel from the upper opening 102 to the lower opening 103, which shortens the flow time and path of the electrolyte in the injection channel 101 and improves the injection efficiency.

[0038] Please refer to it again. Figure 3The extension 2013 slides against the peripheral wall of the second channel 1013. The size of the extension 2013 can be adapted to the inner sidewall of the second channel 1013. The second channel 1013 can serve as a positioning reference, enabling the extension 2013 to be accurately installed in the predetermined position without frequent alignment adjustments, thus improving installation efficiency. Furthermore, the second channel 1013 provides lateral support to the extension 2013, preventing it from shifting due to lateral forces during movement.

[0039] Please refer to it again. Figure 3 The electrolyte injection component 10 has an auxiliary channel 104, which is connected to the end of the second channel 1013 near the lower opening 103 and the clearance channel 1012. In practical applications, if the injection pressure of the electrolyte injection machine is high and a large amount of electrolyte is injected, the assembly cavity 2015 may not be able to meet the electrolyte flow rate. In this case, the high hydraulic pressure may compress the reset component 202 beyond its elastic limit. Therefore, the auxiliary channel 104 can play a role in assisting flow guidance. The electrolyte is injected into the battery through the auxiliary channel 104, increasing the flow rate of electrolyte to the second channel 1013, so that the electrolyte can quickly fill the battery and shorten the injection time. In addition, the auxiliary channel 104 can also serve as a backup channel. When the through hole 2014 or the assembly cavity 2015 is blocked, the electrolyte can flow into the battery through the auxiliary channel 104 to maintain the basic function of the device.

[0040] Please refer to it again. Figure 3 The liquid injection anti-blowout mechanism includes a fixing plate 30, which is disposed in the liquid injection component 10 and spans the second channel 1013. The fixing plate 30 has a clearance hole 301 communicating with the second channel 1013. The liquid injection component 10 is connected to the reset component 202 through the fixing plate 30.

[0041] In practical applications, to ensure more stable installation of the reset component 202, this application provides a fixing plate 30. Along the radial direction of the second channel 1013, the fixing plate 30 spans the second channel 1013. The fixing plate 30 provides a larger connecting surface, which facilitates the installation and positioning of the reset component 202. The larger connecting surface allows for more even force distribution at the end of the reset component 202, and can disperse the force transmitted by the reset component 202, thereby reducing stress concentration and protecting the device from damage. Simultaneously, the fixing plate 30 is provided with clearance holes 301 for guiding the electrolyte flow.

[0042] Please see Figure 4The injection component 10 also includes an injection head 105 and a connector 106. The injection head 105 has a lower opening 103, and the connector 106 has an upper opening 102. The injection channel 101 passes through the injection head 105 and the connector 106. The injection head 105 and the connector 106 are threaded together. The injection head 105 and the connector 106 clamp the fixing plate 30.

[0043] In practical applications, after prolonged use, residual electrolyte or internal battery substances may accumulate in the electrolyte filling component 10. To facilitate cleaning and replacement, the electrolyte filling component 10 is divided into an filling head 105 and a connector 106. The filling head 105 and the connector 106 are detachably connected. When replacement or cleaning is required, the filling head 105 can be separated from the connector 106, allowing for individual cleaning of either the filling head 105 or the connector 106. Simultaneously, the filling head 105 and the connector 106 respectively clamp the fixing plate 30, serving two purposes: firstly, to securely install the fixing plate 30 without requiring additional fixing devices; and secondly, to facilitate disassembly and replacement of the fixing plate 30.

[0044] In one embodiment, the injection head 105 and the connector 106 can be connected by threads, which makes the installation and removal of the injection head 105 easier and allows control over the force with which the injection head 105 clamps the fixing plate 30; other methods such as plug-in can also be used, which are not limited in this application.

[0045] Please refer to it again. Figure 4 In the direction away from the avoidance channel 1012, the diameter of at least part of the first channel 1011 gradually increases. That is, the diameter of the first channel 1011 gradually increases in the direction near the upper opening 102. This facilitates smoother electrolyte flow. At the same time, the inner wall of the first channel 1011 has a guiding effect, which increases the flow speed of the electrolyte. Relatively speaking, the inside of the first channel 1011 is easier to be rinsed clean by the electrolyte, reducing the possibility of electrolyte residue and impurity accumulation.

[0046] Please refer to it again. Figure 4 A chamfer 1014 is provided at the connection between the first channel 1011 and the avoidance channel 1012. The circumferential surface of the isolation member 201 gradually tapers away from the lower opening 103, and the circumferential surface of the isolation member 201 is used to abut against the chamfer 1014.

[0047] In practical applications, the circumference of the isolator 201 gradually shrinks in the direction away from the lower opening 103, and the chamfer 1014 tilts towards the inside of the first channel 1011. In this way, when the isolator 201 blocks the connection between the first channel 1011 and the avoidance channel 1012, the isolator 201 and the chamfer 1014 can fit tightly together, which strengthens the blocking effect of the isolator 201.

[0048] Unlike existing technologies, this utility model provides a liquid injection anti-blowout mechanism and a liquid injection device. The liquid injection anti-blowout mechanism includes a liquid injection component 10 and a one-way component 20. The liquid injection component 10 has a liquid injection channel 101 and an upper opening 102 and a lower opening 103 communicating with the liquid injection channel 101. The one-way component 20 is disposed in the liquid injection channel 101 and has a conducting state and a closed state. In the conducting state, the one-way component 20 allows the electrolyte to enter the liquid injection channel 101 through the upper opening 102 and flow to the lower opening 103. In the closed state, the one-way component 20 blocks the flow of electrolyte in the liquid injection channel 101. Compared to existing technologies, this application incorporates a unidirectional component 20. Under hydraulic pressure, the unidirectional component 20 is in a conductive state, allowing electrolyte to be injected into the battery through the injection channel 101. Once injection is complete, the hydraulic pressure disappears. Simultaneously, due to the presence of a slight positive pressure inside the battery, which acts in the opposite direction to the hydraulic pressure, the unidirectional component 20 experiences a force in the opposite direction to the hydraulic pressure, allowing it to return to a closed state and block the flow of electrolyte, effectively preventing electrolyte from spraying out of the injection component 10. This injection device employing such an anti-spray mechanism can close the injection channel 101 when the injection machine is removed, preventing electrolyte from spraying out of the injection component 10 and contaminating the battery environment.

[0049] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0050] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0051] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0052] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A liquid injection anti-blowout mechanism, characterized in that, include: The liquid injection component has a liquid injection channel and an upper opening and a lower opening communicating with the liquid injection channel; as well as A one-way component is disposed in the injection channel. The one-way component has a conducting state and a closed state. In the conducting state, the one-way component allows electrolyte to enter the injection channel through the upper port and flow to the lower port. In the closed state, the one-way component blocks the flow of electrolyte in the injection channel.

2. The liquid injection anti-blowout mechanism according to claim 1, characterized in that, The injection channel includes a first channel and a clearance channel that are interconnected. The first channel is located at the end of the clearance channel near the upper opening, and the diameter of the clearance channel is larger than that of the first channel. The unidirectional component includes an isolator disposed in the clearance channel. In the closed state, the isolator abuts against the connection between the first channel and the clearance channel and blocks the first channel. In the conducting state, the isolating element remains in the avoidance channel, and the avoidance channel and the first channel are in a connected state.

3. The liquid injection anti-blowout mechanism according to claim 2, characterized in that, The injection channel further includes a second channel, which is located at the end of the avoidance channel away from the first channel, and the diameter of the avoidance channel is larger than that of the second channel; The unidirectional component further includes a reset member, one end of which is connected to the isolator and the other end of which is connected to the injection member. The reset member is used to push the isolator against the connection between the first channel and the avoidance channel. In the conducting state, the reset member is used to maintain the isolator in the avoidance channel.

4. The liquid injection anti-blowout mechanism according to claim 3, characterized in that, The isolation component includes a plug, a transition portion, and an extension portion connected in sequence. The plug is used to abut against the connection between the first channel and the avoidance channel and to block the first channel. The extension portion is assembled in the second channel and has an assembly cavity. The reset component is assembled in the assembly cavity and connected to the liquid injection component. The transition portion has a through hole connecting the assembly cavity and the avoidance channel.

5. The liquid injection anti-blowout mechanism according to claim 4, characterized in that, The extension and the peripheral wall of the second channel slide against each other.

6. The liquid injection anti-blowout mechanism according to claim 4, characterized in that, The injection component has an auxiliary channel, which is connected to the end of the second channel near the lower opening and the clearance channel.

7. The liquid injection anti-blowout mechanism according to any one of claims 3 to 6, characterized in that, The liquid injection anti-blowout mechanism includes a fixing plate, which is disposed in the liquid injection component and spans the second channel. The fixing plate has a clearance hole communicating with the second channel. The liquid injection component is connected to the reset component through the fixing plate.

8. The liquid injection anti-blowout mechanism according to claim 7, characterized in that, The injection component includes an injection head and a connector. The injection head has a lower opening, and the connector has an upper opening. The injection channel passes through the injection head and the connector. The injection head and the connector are threadedly connected, and the injection head and the connector clamp the fixing plate.

9. The liquid injection anti-blowout mechanism according to any one of claims 2 to 6, characterized in that, In the direction away from the avoidance passage, at least a portion of the diameter of the first passage gradually increases.

10. The liquid injection anti-blowout mechanism according to any one of claims 2 to 6, characterized in that, The connection between the first channel and the avoidance channel is provided with a chamfer, and the peripheral surface of the isolation member gradually tapers away from the lower opening, and the peripheral surface of the isolation member is used to abut against the chamfer.

11. A liquid injection device, characterized in that, The injection device includes: an injection machine and an injection anti-blowout mechanism as described in any one of claims 1 to 10, wherein the upper openings of the injection machine and the injection anti-blowout mechanism are connected.

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