Electrolyte injection device for lithium battery production line

Abstract

The utility model relates to the technical field of battery cell liquid injection, in particular to an electrolyte injection device for a lithium battery production line, which comprises a machine base, a mounting jig arranged on the machine base and used for mounting a battery cell, a liquid injection piece with two open ends and arranged on the machine base in a vertical sliding manner, and a liquid injection mechanism communicated with one end of the liquid injection piece, the liquid injection mechanism is used for conveying electrolyte into the liquid injection part; the collecting box is arranged on the machine base in a sliding mode, an opening is formed in the top of the collecting box, the collecting box is arranged between the liquid injection part and the mounting jig, and a collecting position exists on a sliding path of the collecting box; the pre-expanding mechanism is arranged on the machine base and used for pre-expanding a battery bag of a battery cell. Compared with the prior art, the device has the advantages that the leaked electrolyte is collected and utilized after the electrolyte is injected by the electrolyte injection mechanism, so that the waste of the electrolyte is reduced, the production cost of a battery cell is reduced, and the production safety of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core injection, in particular to an electrolyte injection device for a lithium battery production line. Background Art

[0002] In the production process of lithium batteries, after the battery cells are placed in the aluminum-plastic film, they need to go through the process of injecting electrolyte. Injection is a crucial process in the production process of lithium batteries. The quality of the injection process directly affects the quality and service life of lithium batteries.

[0003] After the existing liquid injection mechanism injects liquid into the battery cell, liquid leakage is likely to occur at the liquid injection port of the liquid injection mechanism, thereby causing electrolyte waste. In addition, the leaked electrolyte will splash to various parts of the equipment, which is likely to affect the equipment and the on-site environment, and needs to be solved urgently. Utility Model Content

[0004] In response to the above-mentioned deficiencies in the prior art, the present application provides an electrolyte injection device for a lithium battery production line, which aims to collect and utilize the electrolyte leakage after the injection mechanism injects the electrolyte, so as to reduce the waste of electrolyte, thereby reducing the production cost of battery cells and improving the safety of battery cell production.

[0005] The above invention objectives of the present application are achieved through the following technical solutions:

[0006] A machine base, wherein the machine base is provided with a mounting fixture for mounting the battery cell, the machine base is vertically slidably provided with a liquid injection piece with openings at both ends, one end of the liquid injection piece is connected to a liquid injection mechanism, the liquid injection mechanism is used to transport electrolyte into the liquid injection piece, when the battery cell is located on the mounting fixture, the liquid injection piece is located directly above the battery cell, and the machine base is provided with a first driving component for driving the liquid injection piece to slide;

[0007] A collecting box, the collecting box is slidably disposed on the machine base, the top of the collecting box is open and is disposed between the liquid injection piece and the mounting fixture, there is a collecting position on the sliding path of the collecting box, when the collecting box is located at the collecting position, the collecting box is located directly below the liquid injection piece and directly above the mounting fixture, and the machine base is provided with a second driving component for driving the collecting box to slide;

[0008] A pre-expansion mechanism is arranged on the base, and when the battery cell is located on the mounting fixture, the pre-expansion mechanism is used to pre-expand the battery bag of the battery cell.

[0009] By adopting the above technical solution, when the battery cell is located in the installation fixture, the battery bag of the battery cell is first preliminarily expanded by the pre-expansion mechanism, and then the first drive component drives the injection piece to move vertically downward close to the battery cell until it enters the battery cell. Under the action of the injection mechanism, the electrolyte enters the battery cell through the injection piece to complete the injection process. At this time, the first drive component drives the injection piece to move vertically upward away from the battery cell to make way for the collection box, and in the process of vertical movement, the leaked liquid will drip into the inside of the battery cell without leaking out. After making way, the second drive component drives the collection box to move to the collection position, and the leaked liquid drips into the collection box for collection. Compared with the traditional injection device, by setting a collection box to collect electrolyte, it can avoid the waste of electrolyte and reduce the possibility of electrolyte splashing to the site.

[0010] In a preferred example, the present application can be further configured as follows: the first driving component includes a lifting plate and a motor screw, the motor screw is vertically fixedly installed on the machine base, the motor screw is used to drive the lifting plate to move, and the injection part is fixedly installed on the lifting plate.

[0011] By adopting the above technical solution, a lifting plate is set to provide an installation position for the injection piece, and a motor screw is vertically set to provide a power source for vertical movement of the lifting plate, so as to drive the injection piece to move vertically into the battery cell for injection. At the same time, the transmission accuracy of the motor screw is high, which is suitable for the working conditions of battery cell injection.

[0012] In a preferred example, the present application can be further configured as follows: the second driving component includes a movable plate and a cylinder, the base is provided with a clearance opening, the cylinder is fixedly mounted on the base and is used to drive the movable plate to slide in the clearance opening, and the collection box is fixedly mounted on the movable plate.

[0013] By adopting the above technical solution, a movable plate is set to provide an installation position for the collection box, and a cylinder is set to provide a power source for the movable plate to move in the clearance port, so as to drive the collection box to move to the liquid injection piece to collect the leaked liquid.

[0014] In a preferred example, the present application can be further configured as follows: the injection mechanism includes a liquid storage tank and a first liquid pump, the liquid storage tank is filled with electrolyte, the liquid storage tank and the first liquid pump are both arranged on one side of the machine base, one end of the first liquid pump is connected to the top of the injection piece through an infusion tube and the other end is connected to the liquid storage tank through an infusion tube.

[0015] By adopting the above technical solution, when the liquid injection piece is located inside the battery cell, the first liquid pump can generate a negative pressure state in the liquid storage tank through the infusion tube, so that the electrolyte in the liquid storage tank is transported to the liquid injection piece through the infusion tube, and then enters the battery cell to complete the liquid injection.

[0016] In a preferred example, the present application can be further configured as follows: a second liquid pump is provided on one side of the base, one end of the second liquid pump is connected to the collection box through an infusion tube and the other end of the second liquid pump is connected to the liquid storage tank through an infusion tube.

[0017] By adopting the above technical solution, the second liquid pump can generate a negative pressure state inside the collection box through the infusion tube, so that the electrolyte collected in the collection box is transported to the liquid storage tank through the infusion tube, thereby completing the recovery and utilization of the leaked electrolyte.

[0018] In a preferred example, the present application can be further configured as follows: the size of the liquid injection part gradually increases from bottom to top.

[0019] By adopting the above technical solution, it is convenient for the liquid injection piece to enter the battery bag of the battery cell, and the possibility of damaging the battery bag is reduced.

[0020] In a preferred example, the present application can be further configured as follows: the pre-expansion mechanism includes a rotating rod, which is rotatably connected to the machine base, and the rotating rod is provided with a first thread segment and a second thread segment, and the first thread segment and the second thread segment are in opposite directions. The rotating rod is penetrated by two relative sliding seats, and the two sliding seats are respectively threadedly engaged with the first thread segment and the second thread segment, and each sliding seat is horizontally provided with a suction cup, which is connected to an external air pump, and the two suction cups are respectively used to abut against the opposite sides of the battery cell bag, and the machine base is fixedly installed with a motor for driving the rotating rod to rotate.

[0021] By adopting the above technical solution, when the battery cell is located in the installation fixture, according to the principle of screw transmission, the rotating rod rotates under the action of the motor, and since the directions of the first thread segment and the second thread segment are opposite, the two sliding seats drive the suction cups to move towards each other until they respectively abut against the opposite sides of the battery bag of the battery cell. At this time, the suction cups generate adsorption force on the battery bag through the external air pump, and then drive the two sliding seats to move in opposite directions. The battery bag is opened under the pull of the two relative suction cups, thereby realizing the pre-expansion process of the battery bag to facilitate the liquid injection part to enter the interior of the battery cell.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. When the battery cell is located in the installation fixture, the battery bag of the battery cell is first expanded by the pre-expansion mechanism, and then the first drive component drives the injection piece to move vertically downward close to the battery cell until it enters the battery cell. Under the action of the injection mechanism, the electrolyte enters the battery cell through the injection piece to complete the injection process. At this time, the first drive component drives the injection piece to move vertically upward away from the battery cell to make way for the collection box, and in the process of vertical movement, the leaked liquid will drip into the inside of the battery cell without leaking out. After making way, the second drive component drives the collection box to move to the collection position, and the leaked liquid drips into the collection box for collection. Compared with the traditional injection device, by setting a collection box to collect electrolyte, it can avoid the waste of electrolyte and reduce the possibility of electrolyte splashing to the site.

[0024] 2. By setting a movable plate to provide an installation position for the collection box, and setting a cylinder, a power source can be provided for the movable plate to move in the make way port, so as to drive the collection box to move to the liquid injection piece for collecting the leaked liquid.

[0025] 3. The second liquid pump can generate a negative pressure state inside the collection box through the infusion tube, so that the electrolyte collected in the collection box is transported to the liquid storage tank through the infusion tube, thereby completing the recovery and utilization of the electrolyte leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of an electrolyte injection device for a lithium battery production line in one embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the structure of the electrolyte injection device of the lithium battery production line after the pre-expansion mechanism is hidden in one embodiment of the present application;

[0028] Figure 3 It is a partial structural schematic diagram of an electrolyte injection device for a lithium battery production line in one embodiment of the present application.

[0029] Figure markings: B1, base; B2, battery cell; B3, mounting fixture; B4, liquid injection part; B5, liquid injection mechanism; B51, liquid storage tank; B52, first liquid pump; B6, first drive assembly; B61, lifting plate; B62, motor screw; B7, collecting box; B8, second drive assembly; B81, moving plate; B82, cylinder; B9, pre-expansion mechanism; B91, rotating rod; B92, first threaded segment; B93, second threaded segment; B94, sliding seat; B95, suction cup; B96, motor; B10, second liquid pump. DETAILED DESCRIPTION

[0030] The following is a description of exemplary embodiments of the present application in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0031] It should be noted that the terms "first", "second", etc. in the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure.

[0032] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally means that the associated objects before and after are in an "or" relationship.

[0033] The following describes an electrolyte injection device for a lithium battery production line of the present application with reference to the accompanying drawings.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the electrolyte injection device of the lithium battery production line includes a machine base B1, the machine base B1 is provided with a mounting fixture B3 for mounting a battery cell B2, the machine base B1 is vertically slidably provided with an injection piece B4 with openings at both ends, wherein the size of the injection piece B4 gradually increases from bottom to top, so as to facilitate the injection piece B4 to enter the battery bag of the battery cell B2 and reduce the possibility of damaging the battery bag, one end of the injection piece B4 is connected to an injection mechanism B5, the injection mechanism B5 is used to transport the electrolyte into the injection piece B4, when the battery cell B2 is located on the mounting fixture B3, the injection piece B4 is located directly above the battery cell B2, and the machine base B1 is provided with a first driving component B6 for driving the injection piece B4 to slide;

[0035] In order to collect electrolyte leakage, Figure 1 and Figure 2As shown, the base B1 is provided with a collecting box B7, which is slidably arranged on the base B1. The top of the collecting box B7 is opened and is arranged between the liquid injection piece B4 and the mounting fixture B3. There is a collecting position on the sliding path of the collecting box B7. When the collecting box B7 is located at the collecting position, the collecting box B7 is located directly below the liquid injection piece B4 and directly above the mounting fixture B3. The base B1 is provided with a second driving component B8 for driving the collecting box B7 to slide. The base B1 is provided with a pre-expansion mechanism B9. When the battery cell B2 is located on the mounting fixture B3, the pre-expansion mechanism B9 is used to pre-expand the battery bag of the battery cell B2. When the battery cell B2 is located on the mounting fixture B3, the pre-expansion mechanism B9 is used to pre-expand the battery bag of the battery cell B2. When the battery cell B2 is located on the mounting fixture B3, the pre-expansion mechanism B9 is first used to perform a preliminary expansion process on the battery bag of the battery cell B2, and then Then, the first driving component B6 drives the injection part B4 to move vertically downward close to the battery cell B2 until it enters the battery cell B2. Under the action of the injection mechanism B5, the electrolyte enters the battery cell B2 through the injection part B4 to complete the injection process. At this time, the first driving component B6 drives the injection part B4 to move vertically upward away from the battery cell B2 to make way for the collecting box B7, and in the process of vertical movement, the leaked liquid will drip into the battery cell B2 without leaking out. After making way, the collecting box B7 is driven by the second driving component B8 to move to the collection position, and the leaked liquid drips into the collecting box B7 for collection. Compared with the traditional injection device, by setting the collecting box B7 to collect the electrolyte, the waste of electrolyte can be avoided and the possibility of electrolyte splashing to the scene can be reduced.

[0036] Among them, the first driving component B6 includes a lifting plate B61 and a motor screw B62. The motor screw B62 is vertically fixed on the machine base B1. The motor screw B62 is used to drive the lifting plate B61 to move. The injection part B4 is fixedly installed on the lifting plate B61. By setting the lifting plate B61 to provide an installation position for the injection part B4, and vertically setting the motor screw B62, a power source for vertical movement can be provided to the lifting plate B61, so as to drive the injection part B4 to move vertically to the inside of the battery cell B2 for injection. At the same time, the transmission accuracy of the motor screw B62 is high, which is suitable for the working condition of injecting liquid into the battery cell B2.

[0037] The second driving component B8 includes a moving plate B81 and a cylinder B82. The base B1 is provided with a clearance opening. The cylinder B82 is fixedly installed on the base B1 and is used to drive the moving plate B81 to slide in the clearance opening. The collecting box B7 is fixedly installed on the moving plate B81. By setting the moving plate B81 to provide an installation position for the collecting box B7, and setting the cylinder B82, a power source can be provided for the moving plate B81 to move in the clearance opening, so as to drive the collecting box B7 to move to the liquid injection part B4 to collect the leaked liquid.

[0038] In addition, if Figure 1As shown, the injection mechanism B5 includes a liquid storage tank B51 and a first liquid pump B52. The liquid storage tank B51 is filled with electrolyte. The liquid storage tank B51 and the first liquid pump B52 are both arranged on one side of the machine base B1. One end of the first liquid pump B52 is connected to the top of the injection piece B4 through an infusion tube (not shown in the figure) and the other end is connected to the liquid storage tank B51 through the infusion tube. When the injection piece B4 is located inside the battery cell B2, the first liquid pump B52 can generate a negative pressure state in the liquid storage tank B51 through the infusion tube, so that the electrolyte in the liquid storage tank B51 is transported to the injection piece B4 through the infusion tube, thereby entering the battery cell B2 to complete the injection.

[0039] Furthermore, a second liquid pump B10 is provided on one side of the base B1, one end of the second liquid pump B10 is connected to the collection box B7 through an infusion tube (not shown in the figure) and the other end is connected to the liquid storage tank B51 through the infusion tube. The second liquid pump B10 can generate a negative pressure state inside the collection box B7 through the infusion tube, so that the electrolyte collected in the collection box B7 is transported to the liquid storage tank B51 through the infusion tube, thereby completing the recycling of the leaked electrolyte.

[0040] In this embodiment, if Figure 3 As shown, the pre-expansion mechanism B9 includes a rotating rod B91, which is rotatably connected to the base B1, and is provided with a first thread segment B92 and a second thread segment B93, the first thread segment B92 and the second thread segment B93 are in opposite directions, and the rotating rod B91 is penetrated by two opposite sliding seats B94, the two sliding seats B94 are respectively threadedly matched with the first thread segment B92 and the second thread segment B93, each sliding seat B94 is horizontally provided with a suction cup B95, the suction cup B95 is connected to an external air pump (not shown in the figure), and the two suction cups B95 are respectively used to abut the opposite sides of the battery bag of the battery cell B2, and the base B1 is fixedly installed with a suction cup B95 for driving the battery cell B2. The motor B96 that rotates the rotating rod B91, when the battery cell B2 is located on the mounting fixture B3, according to the principle of screw transmission, the rotating rod B91 rotates under the action of the motor B96, and since the directions of the first thread segment B92 and the second thread segment B93 are opposite, the two sliding seats B94 drive the suction cups B95 to move towards each other until they respectively abut against the opposite sides of the battery bag of the battery cell B2. At this time, the suction cups B95 generate adsorption force on the battery bag through an external air pump, and then drive the two sliding seats B94 to move in opposite directions. The battery bag is opened under the pull of the two relative suction cups B95, thereby realizing the pre-expansion process of the battery bag, so that the injection part B4 can enter the interior of the battery cell B2.

[0041] The implementation principle of the electrolyte injection device of a lithium battery production line in an embodiment of the present application is as follows: when working, the battery cell B2 is first placed on the mounting fixture B3, and after the pre-expansion mechanism B9 completes the preliminary expansion process of the battery cell B2, the lifting plate B61 is driven by the motor screw B62 to drive the injection part B4 to descend to the inside of the battery cell B2, and the injection is carried out through the injection mechanism B5. After the injection is completed, the injection part B4 rises to make way for the moving plate B81, so that the cylinder B82 drives the moving plate B81 to drive the collection box B7 to move to the injection part B4 to complete the leakage collection, which can avoid the waste of electrolyte and reduce the possibility of electrolyte splashing to the site.

[0042] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. An electrolyte injection device for a lithium battery production line, characterized in that: include: A machine base (B1), wherein the machine base (B1) is provided with a mounting fixture (B3) for mounting a battery cell (B2), the machine base (B1) is vertically slidably provided with a liquid injection piece (B4) with openings at both ends, one end of the liquid injection piece (B4) is connected to a liquid injection mechanism (B5), the liquid injection mechanism (B5) is used to transport electrolyte into the liquid injection piece (B4), when the battery cell (B2) is located on the mounting fixture (B3), the liquid injection piece (B4) is located directly above the battery cell (B2), and the machine base (B1) is provided with a first driving component (B6) for driving the liquid injection piece (B4) to slide; A collecting box (B7), the collecting box (B7) is slidably arranged on the machine base (B1), the top of the collecting box (B7) is open and is arranged between the liquid injection piece (B4) and the mounting fixture (B3), there is a collecting position on the sliding path of the collecting box (B7), when the collecting box (B7) is located at the collecting position, the collecting box (B7) is located directly below the liquid injection piece (B4) and directly above the mounting fixture (B3), and the machine base (B1) is provided with a second driving component (B8) for driving the collecting box (B7) to slide; A pre-expansion mechanism (B9), wherein the pre-expansion mechanism (B9) is arranged on the base (B1), and when the battery cell (B2) is located on the mounting fixture (B3), the pre-expansion mechanism (B9) is used to pre-expand the battery bag of the battery cell (B2).

2. The electrolyte injection device for a lithium battery production line according to claim 1, characterized in that: The first driving component (B6) comprises a lifting plate (B61) and a motor screw (B62), wherein the motor screw (B62) is vertically fixedly mounted on the machine base (B1), and the motor screw (B62) is used to drive the lifting plate (B61) to move, and the injection piece (B4) is fixedly mounted on the lifting plate (B61).

3. The electrolyte injection device for a lithium battery production line according to claim 1, characterized in that: The second driving component (B8) comprises a movable plate (B81) and a cylinder (B82); the machine base (B1) is provided with a clearance opening; the cylinder (B82) is fixedly mounted on the machine base (B1) and is used to drive the movable plate (B81) to slide in the clearance opening; the collecting box (B7) is fixedly mounted on the movable plate (B81).

4. The electrolyte injection device for a lithium battery production line according to claim 1, characterized in that: The injection mechanism (B5) comprises a liquid storage tank (B51) and a first liquid pump (B52), wherein the liquid storage tank (B51) contains electrolyte, and the liquid storage tank (B51) and the first liquid pump (B52) are both arranged on one side of the machine base (B1), and one end of the first liquid pump (B52) is connected to the top of the injection piece (B4) through an infusion tube, and the other end of the first liquid pump (B52) is connected to the liquid storage tank (B51) through an infusion tube.

5. The electrolyte injection device for a lithium battery production line according to claim 4, characterized in that: A second liquid pump (B10) is provided on one side of the machine base (B1), one end of the second liquid pump (B10) is connected to the collection box (B7) through an infusion tube, and the other end of the second liquid pump (B10) is connected to the liquid storage tank (B51) through an infusion tube.

6. The electrolyte injection device for a lithium battery production line according to claim 1, characterized in that: The size of the liquid injection part (B4) gradually increases from bottom to top.

7. The electrolyte injection device for a lithium battery production line according to claim 1, characterized in that: The pre-expansion mechanism (B9) includes a rotating rod (B91), the rotating rod (B91) is rotatably connected to the machine base (B1), the rotating rod (B91) is provided with a first thread segment (B92) and a second thread segment (B93), the first thread segment (B92) and the second thread segment (B93) are in opposite directions, the rotating rod (B91) is penetrated by two relative sliding seats (B94), the two sliding seats (B94) are respectively threadedly matched with the first thread segment (B92) and the second thread segment (B93), each sliding seat (B94) is horizontally provided with a suction cup (B95), the suction cup (B95) is connected to an external air pump, the two suction cups (B95) are respectively used to abut against the opposite sides of the battery bag of the battery cell (B2), and the machine base (B1) is fixedly installed with a motor (B96) for driving the rotating rod (B91) to rotate.

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