Secondary liquid injection clamp

Abstract

The utility model discloses a secondary liquid injection clamp which comprises a clamp body, the clamp body comprises a frame body structure which is formed by a bottom plate and side plates and is used for placing a battery cell, and the clamp body further comprises a restraining plate and a vertical plate which are vertically arranged above the bottom plate and are used for dividing the frame body structure into a plurality of areas, and a restraining strip which is connected with the restraining plate and is used for restraining the restraining plate is arranged on the outer side of the frame body structure. The battery cell liquid injection device can accommodate battery cells with different widths, is wide in applicability, and can promote the battery cells to absorb electrolyte, shorten the liquid injection time and improve the liquid injection efficiency.

Description

Technical Field

[0001] The utility model relates to the field of battery liquid injection, in particular to a secondary liquid injection clamp. Background Art

[0002] Lithium-ion batteries have the advantages of high energy, high battery voltage, wide operating temperature range, long storage life and small size, and have been widely used in mobile energy, energy storage systems, electronic products, aerospace and other fields. In the production process of lithium batteries, liquid injection is a crucial process, and the quality of liquid injection directly affects the battery yield.

[0003] At present, the differential pressure injection process is usually used to perform secondary injection on the battery cell, that is, positive pressure, normal pressure, and negative pressure are applied to the internal circulation of the battery cell to encourage the battery cell to fully absorb the electrolyte. However, when the battery cell is injected with positive pressure, the battery cell is placed in the existing fixture, and deformation such as swelling usually occurs, which will cause the battery to be scrapped and waste manpower and material costs; in addition, most of the current lithium battery injection fixtures are fixed fixtures, and the battery cell can only be placed in the fixture when it is below a certain thickness. In actual production, oversized battery cells often appear, which not only easily leads to frequent production shutdowns and low work efficiency, but also easily causes the battery to be crushed and exploded due to excessive mechanical pressure. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a secondary liquid injection fixture, which has wide applicability and can effectively prevent the battery core from being deformed.

[0005] The technical solution of the utility model to solve the above problems is as follows:

[0006] A secondary liquid injection fixture includes a fixture body, wherein the fixture body includes a frame structure formed by a bottom plate and side plates for placing battery cells, and also includes a restraining plate and a vertical plate vertically arranged above the bottom plate to divide the frame structure into multiple areas, and a restraining strip connected to the restraining plate for restraining the restraining plate is arranged on the outside of the frame structure.

[0007] Preferably, the adjacent restraint plates, vertical plates, bottom plates and side plates together form a receiving area for placing the battery cells.

[0008] Preferably, the restraint strip comprises a second restraint strip arranged parallel to the restraint plate, a linear movable rod is arranged between the restraint plate and the second restraint strip for causing the restraint plate to move horizontally, and the linear movable rod and the restraint plate are arranged vertically.

[0009] Preferably, a linear bearing is provided on the side plate between the second restraint strip and the restraint plate, and the linear bearing is sleeved on the outer side of the linear movable rod.

[0010] Preferably, a spring is provided between the linear movable rod and the restraint plate.

[0011] Preferably, the clamp further comprises a first cylinder engaged with the second restraint strip for applying tension to the second restraint strip.

[0012] Preferably, the clamp further comprises a second cylinder abutting against the second restraint strip for applying thrust to the second restraint strip.

[0013] Preferably, the clamp further comprises a lifting device, and the lifting device comprises a lifting cylinder for driving the battery cell to move up and down within the clamp body.

[0014] Preferably, the lifting device is arranged below the clamp body; the lifting device also includes a lifting platform arranged above the lifting cylinder and a column arranged above the lifting platform and capable of abutting against the battery cell in the clamp body.

[0015] Preferably, the bottom plate is provided with a positioning hole for allowing the column to enter the fixture body.

[0016] The utility model has the following beneficial effects:

[0017] 1. The utility model can control the movement of the restraining plate through the first cylinder and the spring, so that batteries of different widths can be placed in the fixture, thereby enhancing the applicability of the fixture;

[0018] 2. During the battery filling process, the utility model can apply thrust to the second restraint strip through the second cylinder, so that the restraint plate is always in contact with the battery cell, effectively preventing the battery cell from being deformed due to excessive pressure during the filling process;

[0019] 3. During the battery injection process, the utility model can adjust the thrust of the second cylinder through a proportional valve connected to the second cylinder according to the different states of the battery core, such as positive pressure, normal pressure, and vacuum, to promote the battery core to absorb electrolyte, shorten the injection time, and improve the injection efficiency;

[0020] 4. The utility model provides a lifting device under the clamp body to assist in placing and taking out the battery cells, thereby improving the convenience of placing and taking out the batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a side view of the utility model before the battery cell is placed;

[0022] Figure 2 This is a top view of the utility model before the battery cell is placed;

[0023] Figure 3 It is a side view of the utility model after the battery cell is placed in and before liquid is injected;

[0024] In the figure: 1-clamp body, 11-bottom plate, 12-side plate, 13-constraint plate, 14-vertical plate, 15-first restraint bar, 16-second restraint bar, 17-linear movable rod, 18-spring, 19-linear bearing, 2-first cylinder, 3-second cylinder, 4-lifting device, 41-lifting cylinder, 42-column. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the utility model and the accompanying drawings 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 of 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.

[0026] A secondary injection fixture, such as Figure 1 As shown, the fixture body 1 includes a bottom plate 11 and a plurality of side plates 12 arranged above the bottom plate 11. The side plates 12 are perpendicular to the bottom plate 11 and are respectively connected to the side edges of the bottom plate 11, so that the bottom plate 11 and the side plates 12 together form a rectangular frame structure. The two opposite wide sides of the frame structure are named first sides, and the two opposite narrow sides are named second sides.

[0027] The bottom plate 11 is also provided with a plurality of vertical plates 14 and a plurality of restraining plates 13. The vertical plates 14 and the restraining plates 13 are perpendicular to the bottom plate 11 and divide the frame structure into a plurality of areas. Among them, a restraining plate 13, the vertical plate 14, the side plate 12 disposed between the vertical plate 14 and the restraining plate 13, and the bottom plate 11 together constitute a receiving area for placing the battery cell.

[0028] A first restraint bar 15 is arranged outside the first side surface of the clamp body 1. There are two first restraint bars 15 arranged outside the two first side surfaces, that is, a total of four first restraint bars 15 are arranged, all of which are arranged horizontally and connected to the restraint plate 13 by bolts. Two second restraint bars 16 are arranged outside a second side surface of the clamp body 1. The second restraint bars 16 are also arranged horizontally and connected to the first restraint bar 15 by bolts. The restraint plate 13 close to the second restraint bar 16 is called the first restraint plate. The two restraint bars on the same side surface are arranged vertically and parallel to each other, and there is a gap between the two restraint bars.

[0029] There is a gap between the second restraint bar 16 and the side plate 12, and a linear bearing 19 is installed on the side plate 12 closest to the second restraint bar 16. A linear movable rod 17 is respectively arranged on the two second restraint bars 16, one end of the linear movable rod 17 is connected to the second restraint bar 16, and the other end passes through the linear bearing 19 and is connected to the first restraint plate through the spring 18. Therefore, when an external force acts on the second restraint bar 16, the second restraint bar 16 moves, and at the same time drives the first restraint bar 15 connected thereto to move.

[0030] When the second restraint strip 16 is not subjected to external force, the spring 18 is in a natural state. When a horizontal pulling force is applied to the second restraint strip 16, the spring 18 is in a stretched state, the second restraint strip 16, the first restraint strip 15 and the restraint plate 13 all move, and the space for the storage area for the battery cells becomes larger. When the pulling force is cancelled, the spring 18 returns to its natural state, and the second restraint strip 16, the first restraint strip 15 and the restraint plate 13 return to their initial positions.

[0031] When a horizontal thrust is applied to the second restraint bar 16, the second restraint bar 16, the first restraint bar 15 and the restraint plate 13 will first be slightly displaced, and the space of the accommodation area for placing the battery cells will hardly become smaller. As the thrust increases or the thrust action time increases, the second restraint bar 16, the first restraint bar 15 and the restraint plate 13 will no longer be displaced, but the force acting on the battery cells in the accommodation area will change with the thrust, and the relationship between the two is positively correlated.

[0032] Therefore, in order to facilitate the adjustment of the space of the accommodation area and the control of the force acting on the battery cells in the accommodation area, the first cylinder 2 and the second cylinder 3 are separately provided. Among them, the first cylinder 2 is arranged between the two second restraint strips 16, and applies a pulling force to the second restraint strip 16, which is used to adjust the space size of the accommodation area, so that the clamp can match the battery cells with different widths, thereby improving the applicable scope of the clamp; the second cylinder 3 is arranged on the outside of the second restraint strip 16, and also acts on the second restraint strip 16. According to the different states of the battery cells such as positive pressure, normal pressure, and vacuum, the thrust applied to the second restraint strip 16 is adjusted through the proportional valve connected to the second cylinder 3, thereby controlling the force acting on the battery cells in the accommodation area. On the one hand, this can make the restraint plate 13 always close to the battery cells to avoid deformation of the battery cells due to pressure changes, and on the other hand, it can also promote the battery cells to absorb electrolyte, reduce the injection time, and improve the injection efficiency.

[0033] In addition, in order to facilitate the placement or removal of the battery cell, a lifting device 4 is provided below the fixture body 1. The lifting device 4 includes a lifting platform and a lifting cylinder 41. The lifting cylinder 41 is installed below the lifting platform and can be used to control the lifting of the lifting platform. The lifting platform includes a horizontal bottom surface parallel to the bottom plate 11 of the fixture body 1, and a plurality of columns 42 are vertically arranged above the horizontal bottom surface. The columns 42 match the plurality of positioning holes provided on the bottom plate 11 of the fixture body 1, that is, the columns 42 can pass through the positioning holes and control the battery cell placed above the positioning holes to rise or fall, which is more convenient for taking and placing the battery cell.

[0034] When the battery cell is about to be placed in the fixture, the lifting cylinder 41 controls the lifting platform to rise, and the column 42 passes through the positioning hole and enters the interior of the fixture body 1. After the battery cell is discharged, the lifting cylinder 41 controls the lifting platform to descend, and the battery cell placed on the column 42 descends accordingly until the battery cell contacts the bottom plate 11 of the fixture body 1, and the discharge is completed. After the battery cell completes the liquid injection process, the lifting cylinder 41 controls the lifting platform to rise, and the column 42 supports the battery cell to move upward to facilitate the battery cell to be taken out.

[0035] The workflow of this utility model is as follows:

[0036] When the battery cell is about to be placed in the fixture body 1, the first cylinder 2 applies a pulling force to the second restraint strip 16, the restraint plate 13 moves, and the space of the accommodating area becomes larger. Then the lifting cylinder 41 controls the lifting platform to rise. After the battery cell is placed in the fixture body 1, the lifting cylinder 41 controls the lifting platform to descend until the battery cell contacts the bottom plate 11. The first cylinder 2 no longer applies a pulling force to the second restraint strip 16, and the restraint plate 13 returns to its original position under the elastic force of the spring 18 to restrain the battery cell. After the battery cell begins to be injected with electrolyte, it will cycle through the three states of positive pressure, normal pressure, and vacuum, and the second cylinder 3 applies a thrust to the second restraint strip 16, and adjusts the thrust through the proportional valve connected to the second cylinder 3 according to the state of the battery cell, so that the restraint plate 13 can always be close to the battery cell, reducing the deformation of the battery cell while promoting the battery cell's absorption of electrolyte and improving the injection efficiency.

Claims

1. A secondary liquid injection fixture, comprising a fixture body (1), wherein the fixture body (1) comprises a frame structure formed by a bottom plate (11) and a side plate (12) for placing a battery cell, characterized in that: It also comprises a restraining plate (13) and a vertical plate (14) vertically arranged above the bottom plate (11) to divide the frame structure into a plurality of areas, and a restraining strip connected to the restraining plate (13) and used to restrain the restraining plate (13) is arranged on the outside of the frame structure.

2. A secondary liquid injection fixture according to claim 1, characterized in that: The adjacent restraining plates (13), vertical plates (14), bottom plates (11), and side plates (12) together form a receiving area for placing the battery cells.

3. A secondary liquid injection fixture according to claim 1, characterized in that: The restraint strip comprises a second restraint strip (16) arranged parallel to the restraint plate (13); a linear movable rod (17) is arranged between the restraint plate (13) and the second restraint strip (16) for causing the restraint plate (13) to move horizontally; and the linear movable rod (17) and the restraint plate (13) are arranged vertically.

4. A secondary liquid injection fixture according to claim 3, characterized in that: A linear bearing (19) is provided on the side plate (12) between the second restraining strip (16) and the restraining plate (13), and the linear bearing (19) is sleeved on the outside of the linear movable rod (17).

5. A secondary liquid injection fixture according to claim 3, characterized in that: A spring (18) is provided between the linear movable rod (17) and the restraining plate (13).

6. A secondary liquid injection fixture according to claim 3, characterized in that: The clamp further comprises a first cylinder (2) which is engaged with the second restraining strip (16) and is used to apply a tensile force to the second restraining strip (16).

7. A secondary liquid injection fixture according to claim 3, characterized in that: The clamp further comprises a second cylinder (3) abutting against the second restraining strip (16) for applying a thrust to the second restraining strip (16).

8. The secondary liquid injection fixture according to claim 1, characterized in that: The clamp further comprises a lifting device (4), wherein the lifting device (4) comprises a lifting cylinder (41) for driving the battery core to move up and down within the clamp body (1).

9. A secondary liquid injection fixture according to claim 8, characterized in that: The lifting device (4) is arranged below the clamp body (1); the lifting device (4) further comprises a lifting platform arranged above the lifting cylinder (41) and a column (42) arranged above the lifting platform and capable of abutting against the battery cell in the clamp body (1).

10. A secondary liquid injection fixture according to claim 9, characterized in that: The bottom plate (11) is provided with a positioning hole for the upright column (42) to enter the clamp body (1).

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