Battery cell liquid supplementing and weighing device

Abstract

The utility model discloses a battery cell liquid supplementing and weighing device, comprising a weighing mechanism which comprises a weighing platform and a base supported below the weighing platform; the battery cell jig comprises a frame body structure with an open upper part and a first air cylinder which is arranged at the bottom of the frame body structure and is used for driving the frame body structure to do lifting motion, and a groove body through which the weighing platform enters and exits is formed in the bottom of the frame body structure; and the liquid injection mechanism comprises a liquid injection nozzle and is used for injecting electrolyte. The battery cell is driven by the liftable battery cell jig to move up and down, so that two functions of liquid injection and weighing are integrated, the liquid injection process is simplified, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery liquid filling equipment, in particular to a battery cell liquid filling weighing device. Background Art

[0002] Lithium-ion square batteries are a type of battery with a relatively high market share in the power lithium battery market. Liquid injection is a relatively critical process in the production process of lithium batteries. Generally, lithium-ion square batteries will be injected twice to meet the quality requirements of battery processing. The two injections are divided into a primary injection process and a secondary injection process. During the process of automatic battery injection, the primary and secondary injection machines will inevitably fail to meet the injection standards, especially when the injection volume is small. Therefore, this defect needs to be compensated by refilling. At present, there are two main refilling measures: the first is to use a liquid injection syringe to manually inject liquid until it is qualified, and the other is to use a single-station refilling device. After each refilling in the above two methods, the battery cell needs to be moved to the weighing module manually or automatically by the equipment for re-weighing, which affects the efficiency of the injection. Utility Model Content

[0003] The purpose of the utility model is to provide a battery cell liquid replenishing weighing device to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A battery cell refill weighing device, comprising:

[0006] A weighing mechanism, comprising a weighing platform and a base supported below the weighing platform;

[0007] A battery cell jig, comprising a frame structure with an open top, and a first cylinder disposed at the bottom of the frame structure for driving the frame structure to move up and down, wherein a slot is provided at the bottom of the frame structure for the weighing platform to enter and exit;

[0008] The liquid injection mechanism comprises a liquid injection nozzle for injecting electrolyte.

[0009] As a further solution of the utility model: the liquid injection mechanism also includes a second cylinder for driving the liquid injection nozzle to move up and down.

[0010] As a further solution of the utility model: it also includes a frame arranged above the battery cell fixture, and the second cylinder and the liquid injection nozzle are both connected to the top of the frame.

[0011] As a further solution of the utility model: it also includes a linear guide rail for driving the frame to move horizontally, and the linear guide rail is slidably connected to the bottom end of the frame.

[0012] As a further solution of the utility model: the height of the weighing platform is greater than the thickness of the trough body.

[0013] As a further solution of the utility model: the frame structure and the first cylinder are connected together via a support frame.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model drives the battery cell to move up and down by means of a liftable battery cell fixture, integrates the two functions of liquid injection and weighing in one, simplifies the liquid injection process, and improves work efficiency.

[0016] The first cylinder rises while the second cylinder descends, driving the injection nozzle and the battery cell to move toward each other, so that the injection nozzle and the battery cell injection port are accurately docked to facilitate pressurized injection. After the injection is completed, the first cylinder descends, driving the battery cell fixture to descend, so that the battery cell falls on the weighing platform and is weighed quickly, reducing the step of moving the battery cell during the injection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a cross-sectional view of the weighing mechanism and the battery cell fixture in the utility model;

[0019] In the figure: 1-weighing mechanism, 11-weighing platform, 12-base, 2-battery fixture, 21-frame structure, 211-tank body, 22-first cylinder, 23-support frame, 3-liquid injection mechanism, 31-liquid injection nozzle, 32-second cylinder, 4-frame, 5-linear guide. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1-2 In an embodiment of the utility model, a battery cell refilling weighing device includes a weighing mechanism 1, a battery cell fixture 2, and a liquid injection mechanism 3, wherein:

[0024] The weighing mechanism 1 includes a weighing platform 11 and a base 12 supported under the weighing platform 11; the battery cell fixture 2 includes a frame structure 21 with an open top, a support frame 23 arranged under the frame structure 21, and a first cylinder 22 arranged at the bottom of the support frame 23, wherein a slot 211 for the weighing platform 11 to enter and exit is opened at the bottom of the frame structure 21, and driven by the first cylinder 22, the frame structure 21 realizes the lifting function. The battery cell to be weighed is placed in the frame structure 21. When the first cylinder 22 pushes upward, the weighing platform 11 is separated from the frame structure 21, and liquid can be injected at this time; when the first cylinder 22 retracts downward, the weighing platform 11 extends into the slot 211 to lift the battery cell, and it can be weighed at this time. The injection mechanism 3 includes an injection nozzle 31 for injecting electrolyte.

[0025] Furthermore, the injection mechanism 3 also includes a second cylinder 32 for driving the injection nozzle 31 to move up and down. Under the joint action of the second cylinder 32 and the first cylinder 22, the injection hole of the battery cell is tightly fitted with the injection nozzle 31, and the missing electrolyte is added to the NG battery cell by pressurization.

[0026] Furthermore, the device further comprises a frame 4 disposed above the battery fixture 2, and the second cylinder 32 and the liquid injection nozzle 31 are both connected to the top of the frame 4. The liquid injection nozzle 31 is vertically downward and moves up and down under the drive of the second cylinder 32.

[0027] Furthermore, it also includes a linear guide rail 5 slidably connected to the bottom end of the frame 4, and the linear guide rail 5 drives the injection mechanism 3 to move horizontally, so that the robot arm can grasp the battery cell without interference.

[0028] Furthermore, the height of the weighing platform 11 is greater than the thickness of the tank body 211 , the tank body 211 is a square tank, and the cross section of the battery cell is greater than the cross section of the tank body 211 .

[0029] When the utility model is in use, the unqualified battery cell is grabbed by the manipulator and put into the frame structure 21. Driven by the linear guide rail 5, the battery cell fixture 2 moves to the position directly below the liquid injection nozzle 31 and directly above the weighing platform 11. The first cylinder 22 retracts to drive the battery cell fixture 2 to descend, so that the battery cell falls on the weighing platform 11, and the battery cell weight value G1 is read. The difference between G1 and the standard battery cell weight G (i.e., the amount of liquid replenishment) is calculated; then, the first cylinder 22 pushes up to lift the battery cell, and at the same time, the second cylinder 32 extends downward. The injection nozzle 31 is driven downward and tightly connected with the liquid filling port of the battery cell, and the missing electrolyte is injected therein by pressurizing; after the injection is completed, the second cylinder 32 retracts upward, driving the injection nozzle 31 to move upward, and at the same time, the first cylinder 22 retracts downward, driving the battery cell fixture 2 to descend, so that the battery cell falls on the weighing platform 11 again, and the battery cell weight value G2 is read again, and the difference between the standard battery cell weight G and G2 is calculated. If the difference falls within the allowable error range, the battery cell liquid filling meets the standard, otherwise the above process is repeated to continue the injection.

[0030] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0031] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A battery cell refill weighing device, characterized in that: include: A weighing mechanism (1) comprises a weighing platform (11) and a base (12) supported below the weighing platform (11); A battery cell jig (2), comprising a frame structure (21) with an open top, and a first cylinder (22) disposed at the bottom of the frame structure (21) for driving the frame structure to move up and down, wherein a slot (211) is provided at the bottom of the frame structure (21) for the weighing platform (11) to enter and exit; The liquid injection mechanism (3) comprises a liquid injection nozzle (31) for injecting electrolyte.

2. The battery cell refill weighing device according to claim 1, characterized in that: The liquid injection mechanism (3) also includes a second cylinder (32) for driving the liquid injection nozzle (31) to move up and down.

3. The battery cell refill weighing device according to claim 2, characterized in that: It also includes a frame (4) arranged above the battery core fixture (2), and the second cylinder (32) and the liquid injection nozzle (31) are both connected to the top of the frame (4).

4. The battery cell refill weighing device according to claim 3, characterized in that: It also comprises a linear guide rail (5) for driving the frame (4) to move horizontally, and the linear guide rail (5) is slidably connected to the bottom end of the frame (4).

5. The battery cell refill weighing device according to claim 1, characterized in that: The height of the weighing platform (11) is greater than the thickness of the tank body (211).

6. The battery cell refill weighing device according to claim 1, characterized in that: The frame structure (21) and the first cylinder (22) are connected together via a support frame (23).

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