Lithium battery liquid injection head

Abstract

The present application relates to a kind of lithium battery liquid injection head, including injection type cavity, one end of the injection type cavity is sealed end, the other end is injection end, injection needle is loaded inside the injection end, the injection needle is communicated with injection type cavity inside, vacuum type cavity is loaded outside the injection end, the battery slot for accommodating lithium battery is equipped with at the outer end of vacuum type cavity, the liquid outlet head of the injection needle corresponds with the injection hole position on lithium battery, the injection needle is communicated with vacuum type cavity inside;Injection sealing rod for sealing injection needle is equipped in the injection type cavity, and the outer end of the injection sealing rod is equipped with driving element.The lithium battery liquid injection head of the present application has the advantages of simple structure, high injection efficiency and good injection effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery liquid injection, in particular to a lithium battery liquid injection head. BACKGROUND

[0002] For the liquid injection operation of lithium battery, at present, the traditional vacuum backflow type liquid injection is mainly used, that is, the lithium battery is inverted in the electrolyte by manual operation, and the air in the lithium battery is extracted, and the electrolyte enters the lithium battery under the action of atmospheric pressure. When the liquid injection is performed in this way, the following disadvantages exist: 1. The electrolyte is easily taken away by the surface of the lithium battery steel shell and the cap, causing waste of the electrolyte; 2. The surface of the lithium battery is easily corroded, affecting the appearance of the lithium battery; 3. The lithium battery is placed in the electrolyte and taken out from the electrolyte by manual operation, which is time-consuming and low in efficiency.

[0003] With the increasingly wide application of lithium batteries, the lithium battery liquid injection is also paid more and more attention by the inventor. At present, automatic liquid injection devices or equipment have appeared on the market. In the current liquid injection device or equipment, more is to place the batteries on the battery arrangement plate, extract vacuum from the whole plate of batteries or the battery group on the battery plate by the vacuum equipment, form negative pressure in the battery, set the liquid injection head above each battery, and inject the electrolyte into each battery through the liquid injection head. This kind of battery liquid injection device or equipment has the advantages of high automation degree and high efficiency. However, the vacuum equipment is used to extract vacuum from the whole plate of batteries or the battery group at the same time, and the vacuum extraction amount of each battery is inconsistent, which leads to uneven negative pressure in each battery during the liquid injection process, and low negative pressure rate, thereby leading to inconsistent liquid injection amount of each battery. For the battery with high negative pressure rate, the liquid injection amount will be too high, and even will overflow the surface of the battery, causing corrosion to the battery. For the battery with low negative pressure rate, the liquid injection amount will be too low, leading to insufficient liquid injection amount in the battery. SUMMARY

[0004] The present application provides a lithium battery liquid injection head with simple structure, high liquid injection efficiency and good liquid injection effect.

[0005] In order to achieve the above purpose, the following technical scheme is adopted.

[0006] A lithium battery liquid injection head, comprising a liquid injection cavity, one end of the liquid injection cavity is a sealed end, and the other end is a liquid injection end, a liquid injection needle is arranged in the liquid injection end, the liquid injection needle is in communication with the inside of the liquid injection cavity, a vacuum cavity is arranged outside the liquid injection end, a battery slot for accommodating a lithium battery is arranged at the outer end of the vacuum cavity, the liquid outlet head of the liquid injection needle corresponds to the position of the liquid injection hole on the lithium battery, and the liquid injection needle is in communication with the inside of the vacuum cavity; a liquid injection sealing rod for sealing the liquid injection needle is arranged in the liquid injection cavity, and a driving member is arranged at the outer end of the liquid injection sealing rod.

[0007] Further, the electrolyte injection hole is arranged on the side wall of the injection cavity.

[0008] Further, the injection cavity is in a funnel shape with a large sealed end and a small electrolyte injection end.

[0009] Further, the injection cavity is provided with a locking sleeve for locking the injection needle at one end of the injection needle, and the locking sleeve is detachably connected with the injection cavity.

[0010] Further, the injection needle is provided with a stepped hole.

[0011] Further, the injection sealing rod is provided with a convex rod corresponding to the stepped hole of the injection needle at one end of the injection sealing rod connected with the injection needle, and the end of the convex rod and the stepped hole are respectively connected with the injection needle.

[0012] Further, the end of the convex rod is provided with a first sealing ring at the connection with the stepped plate of the stepped hole, and the stepped hole of the convex rod is provided with a second sealing ring at the connection with the end of the injection needle.

[0013] Further, the injection sealing rod and the inner wall of the injection cavity are provided with a space gap for containing electrolyte.

[0014] Further, the end of the injection sealing rod away from the injection needle is connected with the driving member after extending out of the sealed end, and the driving member drives the injection sealing rod to seal the injection needle or draws out the injection sealing rod to inject electrolyte.

[0015] Further, the vacuum cavity is provided with a vacuum hole for vacuumizing, and the vacuum cavity is installed outside the injection cavity through a vacuum cavity fixing plate.

[0016] Compared with the prior art, the lithium battery injection head has the following beneficial effects:

[0017] First, the structure is simple, and the lithium battery injection head mainly comprises an injection cavity, an injection needle in the injection cavity, an injection sealing rod for sealing the injection needle, and a vacuum cavity and a driving member respectively arranged at two ends of the injection cavity, so that the whole has few components and simple structure.

[0018] Second, the injection efficiency is high, the lithium battery injection head of the application sets a vacuum cavity at the liquid outlet end of the injection cavity, which is used for vacuumizing the inside of the battery; an injection needle is installed inside one end of the injection cavity, and an injection sealing rod for sealing the injection needle is arranged in the injection cavity; during use, the injection sealing rod is driven by the driving member connected to the outer end of the injection sealing rod to seal the injection needle, then electrolyte is injected into the injection cavity, after the electrolyte is injected, the injection sealing rod is driven by the driving member to be pulled out from the injection cavity, that is, the injection sealing rod is separated from the injection needle, at this time, the electrolyte in the injection cavity is injected into the battery through the injection needle under the action of negative pressure, and the injection of the battery is completed when the internal and external pressures of the battery are balanced, the whole injection process of the injection head is completed automatically, and the injection efficiency is high.

[0019] Third, the injection effect is good, the lithium battery of the application installs an injection needle inside the liquid outlet end of the injection cavity, and the position of the injection needle corresponds to the injection hole on the lithium battery installed in the vacuum cavity, the lithium battery is placed outside the injection cavity, which effectively avoids the problem that the traditional vacuum negative pressure injection places the lithium battery in the electrolyte, and further causes corrosion on the surface of the lithium battery, the injection head of the injection needle corresponds to the injection hole on the lithium battery, and the electrolyte in the injection cavity is injected into the battery under the negative pressure in the battery, which will not cause corrosion on the battery; on the other hand, the injection head is independently arranged, the vacuum cavity of the injection head only performs vacuumizing operation on a single battery in one injection cycle, the battery is removed after completing injection, and the next battery is loaded to perform vacuumizing and injection on the next battery independently, the injection of the battery is performed by using the independent vacuumizing mode, which effectively ensures the consistency of the injection amount of each battery, avoids the problem that the vacuum degree in each battery is inconsistent caused by vacuumizing the whole battery or the battery at one time in the prior art, and further causes the inconsistent performance of each battery, and effectively ensures the injection effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] ATTACHMENT Figure 1 It is a perspective view of the lithium battery injection head of the application;

[0021] ATTACHMENT Figure 2 It is a sectional view of the lithium battery injection head of the application;

[0022] ATTACHMENT Figure 3 It is an enlarged view of A in the Figure 2 DETAILED DESCRIPTION

[0023] The lithium battery injection head of the application will be further described in detail below in combination with specific embodiments and drawings.

[0024] Referring to Figures 1 to 3 ​In a non-restrictive embodiment of the present application, a lithium battery liquid injection head comprises a liquid injection cavity 100, one end of the liquid injection cavity 100 is a sealed end, and the other end is a liquid injection end, the liquid injection end is internally provided with a liquid injection needle 200, the liquid injection needle 200 is in communication with the inside of the liquid injection cavity 100, the liquid injection end is externally provided with a vacuum cavity 400, the outer end of the vacuum cavity 400 is provided with a battery groove 410 for accommodating a lithium battery, the liquid outlet head of the liquid injection needle 200 corresponds to the position of the liquid injection hole on the lithium battery, and the liquid injection needle 200 is in communication with the inside of the vacuum cavity 400; the liquid injection cavity 100 is internally provided with a liquid injection sealing rod 300 for sealing the liquid injection needle 200, and the outer end of the liquid injection sealing rod 300 is provided with a driving member 500. In this embodiment, the sealed end is provided with a sealing cover 111 assembly 110, the sealing cover 111 assembly 110 comprises a sealing cover 111, the sealed end of the liquid injection cavity 100 is provided with a sealing groove for placing the sealing cover 111, the sealing cover 111 is placed in the sealing groove, the sealing cover 111 is externally provided with a sealing cover fixing plate 112 for fixing the sealing cover 111, the sealing cover fixing plate 112 is fixedly connected with the sealed end of the liquid injection cavity 100, and the outer side of the sealing cover fixing plate 112 is further provided with a liquid injection cavity sealed end cover 113, and the liquid injection sealing rod 300 is sealingly movably connected with the sealing cover 111 and the liquid injection cavity sealed end cover 113 respectively.

[0025] Referring to Figures 1 to 3 In this embodiment, the driving member 500 is used to drive the liquid injection sealing rod 300 to move towards the liquid injection needle 200, seal the liquid injection needle 200, and seal the electrolyte 130 in the liquid injection cavity 100, or is used to drive the liquid injection sealing rod 300 to move away from the liquid injection needle 200, that is, to drive the liquid injection sealing rod 300 to be pulled out from the liquid injection cavity 100, so that the liquid injection sealing rod 300 moves away from the liquid injection needle 200, at this time, the electrolyte 130 in the liquid injection cavity 100 is injected into the battery through the liquid injection needle 200 under the suction of the negative pressure in the battery, and when the pressure in the battery is balanced with the pressure in the liquid injection cavity 100, the liquid injection of the battery is completed. The driving member 500 can be a gas pressure drive, such as the gas cylinder 510 in this embodiment, the gas cylinder 510 is installed on the sealing cover fixing plate 112 of the liquid injection cavity 100 through a gas cylinder mounting bracket 520; the driving member 500 can also be a hydraulic drive, such as a hydraulic oil cylinder, can be a ball screw module drive, or other common linear drives. Figure 2

[0026] Referring to Figures 1 to 3 ​The lithium battery liquid injection head is mainly composed of a liquid injection cavity 100, a liquid injection needle 200 in the liquid injection cavity 100, a liquid injection sealing rod 300 for sealing the liquid injection needle 200, and a vacuum cavity 400 and a driving member 500 respectively located at two ends of the liquid injection cavity 100, and has few overall components and simple structure; the lithium battery liquid injection head is provided with the vacuum cavity 400 at the liquid outlet end of the liquid injection cavity 100, for vacuumizing the inside of the battery; the liquid injection needle 200 is arranged inside one end of the liquid injection cavity 100, and the liquid injection sealing rod 300 for sealing the liquid injection needle 200 is arranged in the liquid injection cavity 100; in use, the liquid injection sealing rod 300 is driven by the driving member 500 connected to the outer end of the liquid injection sealing rod 300 to seal the liquid injection sealing rod 300 and the liquid injection needle 200, then electrolyte 130 is injected into the liquid injection cavity 100, after the electrolyte 130 is injected, the liquid injection sealing rod 300 is driven by the driving member 500 to be pulled out from the liquid injection cavity 100, that is, the liquid injection sealing rod 300 is separated from the liquid injection needle 200, at this time, the electrolyte 130 in the liquid injection cavity 100 is injected into the battery through the liquid injection needle 200 under the action of negative pressure in the battery, and the internal and external pressures of the battery are balanced, that is, the liquid injection of the battery is completed, the whole liquid injection process of the battery is automatically completed, and the liquid injection efficiency is high; the lithium battery is provided with the liquid injection needle 200 arranged inside the liquid outlet end of the liquid injection cavity 100, and the position of the liquid injection needle 200 corresponds to the liquid injection hole of the lithium battery arranged in the vacuum cavity 400, the lithium battery is arranged outside the liquid injection cavity 100, the lithium battery is not arranged in the electrolyte 130 in the traditional vacuum negative pressure injection, and the surface of the lithium battery is not corroded, the liquid outlet end of the liquid injection needle 200 corresponds to the liquid injection hole of the lithium battery, the electrolyte 130 in the liquid injection cavity 100 is injected into the battery under the negative pressure in the battery, and the battery is not corroded; on the other hand, the liquid injection head is independently arranged, the vacuum cavity 400 only performs vacuumizing operation on a single battery in one liquid injection cycle, the battery is removed after the liquid injection is completed, and the next battery is arranged to perform vacuumizing and liquid injection on the next battery, the liquid injection on the battery is performed by the independent vacuumizing mode, the consistency of the liquid injection amount of each battery is effectively ensured, the vacuum degrees of the batteries are inconsistent in the prior art, and the performance of the batteries is inconsistent, and the liquid injection effect is effectively ensured.

[0027] Reference Figure 1 and Figure 2In a non-limiting embodiment of the present invention, an injection hole 120 for electrolyte 130 is provided on the side wall of the liquid injection cavity 100, which is used to inject the electrolyte 130 into the liquid injection cavity 100. A sealing hole cover (not shown in the figure) is provided at the injection hole 120. The electrolyte 130 is added to the liquid injection cavity 100 through the injection hole 120. After the electrolyte 130 in the liquid injection cavity 100 is filled, the sealing hole cover is used to cover the injection hole 120 to prevent the electrolyte 130 in the liquid injection cavity 100 from being contaminated, thereby further ensuring the quality and effect of the liquid injection.

[0028] Reference Figure 2 and Figure 3 In a non-limiting embodiment of the present invention, the interior of the injection cavity 100 is funnel-shaped, with a larger sealing end and a smaller injection end. This funnel-shaped structure effectively ensures that the injection cavity 100 can accommodate the electrolyte 130. It also facilitates the installation and securement of a smaller injection needle 200, effectively conserves materials, and provides a foundation for smooth injection of the electrolyte 130 into the battery.

[0029] Reference Figure 2 and Figure 3 In a non-limiting embodiment of the present invention, a locking sleeve 220 for locking the injection needle 200 is provided on the outside of one end of the injection cavity 100 where the injection needle 200 is installed. The locking sleeve 220 is detachably connected to the injection cavity 100. In this embodiment, the inner sidewall of the locking sleeve 220 is provided with a thread, and the locking sleeve 220 is threadedly connected to the injection cavity 100 to block and lock the injection needle 200, preventing the injection needle 200 from escaping from the injection cavity 100, ensuring the stability of the injection needle 200, and preventing the injection needle 200 from deviating during the injection process, causing the electrolyte 130 to overflow on the battery surface. The liquid outlet head of the injection needle 200 is always aligned with the injection hole on the battery, ensuring that the electrolyte 130 enters the battery interior, further ensuring the quality and effect of the injection.

[0030] Reference Figure 2 and Figure 3 In a non-limiting embodiment of the present invention, the interior of the injection needle 200 is provided with a stepped hole 210 of one level or more, and the exterior of the injection needle 200 is a stepped structure. The needle tip of the injection needle 200 extends out of the injection cavity 100 and the bottom plate of the locking sleeve 220. The inner end of the injection needle 200 is installed at the liquid outlet end of the injection cavity 100. This stepped structure of the injection needle 200 makes the installation and fixation of the injection needle 200 more stable. The stepped hole 210 of one level or more inside the injection needle 200 allows the electrolyte 130 to gradually flow into the needle tip of the injection needle 200 and out in a funnel-like manner, ensuring the smooth injection of the electrolyte 130 into the battery interior and effectively improving the injection efficiency.

[0031] Reference Figure 2 andFigure 3 In a non-restrictive embodiment of the present application, the end of the liquid injection sealing rod 300 connected with the liquid injection needle 200 is a convex rod 310 corresponding to the stepped hole 210 of the innermost part of the liquid injection needle 200, and the end and the stepped part of the convex rod 310 are respectively connected with the liquid injection needle 200 in a sealed manner. The connection between the liquid injection sealing rod 300 and the liquid injection needle 200 is provided with the structure of the convex rod 310 corresponding to the stepped hole 210 of the liquid injection needle 200, which effectively ensures the sealing performance of the connection between the liquid injection sealing rod 300 and the liquid injection needle 200, and ensures that the electrolyte 130 does not flow out of the liquid injection needle 200 when no liquid injection is performed.

[0032] Referring to Figure 2 and Figure 3 In a non-restrictive embodiment of the present application, the end of the convex rod 310 is connected with the stepped plate of the stepped hole 210, and the stepped part of the convex rod 310 is connected with the end of the liquid injection needle 200, and the first sealing ring 320 is arranged at the connection position between the end and the stepped part of the convex rod 310 and the liquid injection needle 200, and the second sealing ring 330 is arranged at the connection position between the stepped part of the convex rod 310 and the end of the liquid injection needle 200. The first sealing ring 320 and the second sealing ring 330 are arranged at the connection positions of the end and the stepped part of the convex rod 310 and the liquid injection needle 200, respectively, so that the liquid injection sealing rod 300 forms a two-stage sealing when sealing the liquid injection needle 200, and further enhances the sealing performance between the liquid injection sealing rod 300 and the liquid injection needle 200.

[0033] Referring to Figure 2 and Figure 3 In a non-restrictive embodiment of the present application, a space gap for accommodating the electrolyte 130 is left between the liquid injection sealing rod 300 and the inner wall of the liquid injection cavity 100. The space gap is provided so that the liquid injection sealing rod 300 and the inner wall of the liquid injection cavity 100 always have a moving space for the electrolyte 130 during the process of the liquid injection sealing rod 300 being pulled out, so as to avoid the electrolyte 130 being blocked due to the contact between the liquid injection sealing rod 300 and the liquid injection cavity 100 during the process of the liquid injection sealing rod 300 being pulled out, and to ensure that the electrolyte 130 is smoothly injected into the battery during the process of the liquid injection sealing rod 300 being pulled out.

[0034] Referring to Figure 2 and Figure 3 In a non-restrictive embodiment of the present application, the end of the liquid injection sealing rod 300 away from the liquid injection needle 200 is connected with the driving member 500 after being extended out of the sealing end, and the driving member 500 drives the liquid injection sealing rod 300 to seal the liquid injection needle 200 or to pull out the liquid injection sealing rod 300 to enable the liquid injection needle 200 to perform liquid injection.

[0035] Referring to Figure 2 and Figure 3In a non-restrictive embodiment of the present application, the vacuum cavity 400 is provided with a vacuum hole 420 for vacuumizing, the vacuum cavity 400 is installed outside the liquid injection cavity 100 through a vacuum cavity fixing plate 430, the end of the vacuum cavity fixing plate 430 is provided with a vacuum cavity sealing cover plate 440, so that the vacuum cavity fixing plate 430 is firmly fixed outside the liquid injection cavity 100.

[0036] With reference to Figures 1 to 3 The working principle of the lithium battery liquid injection head of the present application is as follows:

[0037] The lithium battery liquid injection head of the present application is provided with a vacuum cavity 400 at the liquid outlet end of the liquid injection cavity 100, which is used for vacuumizing the inside of the battery; a liquid injection needle 200 is installed inside one end of the liquid injection cavity 100, and a liquid injection sealing rod 300 for sealing the liquid injection needle 200 is arranged in the liquid injection cavity 100; in use, the liquid injection sealing rod 300 is driven to seal the liquid injection needle 200 through a driving member 500 connected to the outer end of the liquid injection sealing rod 300, then electrolyte 130 is injected into the liquid injection cavity 100, after the electrolyte 130 is injected, the liquid injection sealing rod 300 is driven to be pulled out from the liquid injection cavity 100 by the driving member 500, that is, the liquid injection sealing rod 300 is separated from the liquid injection needle 200, at this time, the electrolyte 130 in the liquid injection cavity 100 is injected into the battery through the liquid injection needle 200 under the action of negative pressure, and the internal and external pressures of the battery are balanced, that is, the liquid injection of the battery is completed.

[0038] In the description of the present application, it should be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0040] In this application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] The above embodiments are only specific embodiments of the present application, which are described in detail and in detail, but should not be construed as limiting the scope of the patent of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, and these obvious alternative forms are within the scope of the present application.

Claims

1. A lithium battery liquid injection head, characterized in that The utility model provides a lithium battery injection device, which comprises a liquid injection type cavity, one end of the liquid injection type cavity is a sealed end, the other end is a liquid injection end, a liquid injection needle is arranged in the liquid injection end, the liquid injection needle is communicated with the liquid injection type cavity, a vacuum type cavity is arranged outside the liquid injection end, a battery groove for accommodating a lithium battery is arranged at the outer end of the vacuum type cavity, the liquid injection needle is communicated with the vacuum type cavity, a liquid injection sealing rod for sealing the liquid injection needle is arranged in the liquid injection type cavity, a driving element is arranged at the outer end of the liquid injection sealing rod, wherein, The liquid injection needle is provided with a stepped hole inside, and the liquid injection needle is provided with a stepped structure outside, the liquid injection head of the liquid injection needle is arranged outside the bottom plate of the locking sleeve and extends out of the bottom plate; The liquid injection head is independently arranged, the vacuum type cavity only performs vacuumizing operation on a single battery in one liquid injection cycle, the battery is removed after completing liquid injection, and the next battery is loaded to perform independent vacuumizing and liquid injection.

2. The lithium battery liquid injection head according to claim 1, wherein, An electrolyte injection hole is arranged on the side wall of the liquid injection type cavity, and the electrolyte is injected into the liquid injection type cavity.

3. The lithium battery liquid injection head of claim 1, wherein, The liquid injection type cavity is in the shape of a funnel with a large sealed end and a small liquid injection end.

4. The lithium battery liquid injection head of claim 1, wherein, The outer end of the liquid injection type cavity is provided with a locking sleeve for locking the liquid injection needle, and the locking sleeve is detachably connected with the liquid injection type cavity.

5. The lithium battery liquid injection head according to any one of claims 1 to 4, characterized in that, The end of the liquid injection sealing rod connected with the liquid injection needle is a convex rod corresponding to the stepped hole in the innermost part of the liquid injection needle, and the end of the convex rod and the stepped part are respectively connected with the liquid injection needle.

6. The lithium battery liquid injection head according to claim 5, wherein, The first sealing ring is arranged at the connection between the end of the convex rod and the stepped plate of the stepped hole, and the second sealing ring is arranged at the connection between the stepped part of the convex rod and the end of the liquid injection needle.

7. The lithium battery liquid injection head according to claim 6, wherein, The liquid injection sealing rod and the inner wall of the liquid injection type cavity are connected with a space gap for accommodating electrolyte.

8. The lithium battery liquid injection head according to claim 6, wherein, The end of the liquid injection sealing rod away from the liquid injection needle is connected with the driving element after extending out of the sealed end, and the driving element drives the liquid injection sealing rod to seal the liquid injection needle or drives the liquid injection sealing rod to be extracted to make the liquid injection needle inject liquid.

9. The lithium battery liquid injection head of claim 1, wherein, The vacuum type cavity is provided with a vacuum hole for vacuumizing, and the vacuum type cavity is installed outside the liquid injection type cavity through a vacuum type cavity fixing plate.

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