Device for accelerating pre-lithiation of lithium battery

Abstract

The utility model discloses a device for accelerating pre-lithiation of a lithium battery. The device comprises a fixed shaft, a battery limiting shaft and a tray, a plurality of conductive tracks are arranged at the upper part of the fixed shaft; the battery limiting shaft is cylindrical and is fixed on the tray, the axis of the battery limiting shaft coincides with the circle center of the tray, a battery limiting hoop is arranged on the tray, a plurality of limiting grooves are formed in the outer side wall of the battery limiting shaft, and the limiting grooves and the battery limiting hoop are used for clamping battery blocks; the fixing shaft is located on an inner ring of the battery limiting shaft, a rotating bearing is installed on the lower portion of the fixing shaft, the lower portion of the inner ring of the battery limiting shaft is in sliding connection with the fixing shaft through the rotating bearing, a plurality of pressure arms are rotationally connected to the upper end of the battery limiting shaft, and each limiting groove corresponds to one pressure arm. And each group of pressure arms is provided with an electricity testing mechanism, and finally, voltage monitoring and recording of each battery are realized through the battery tester.

Description

Technical Field

[0001] The utility model relates to the technical field of pre-lithiation of battery cells, in particular to a device for accelerating the pre-lithiation of lithium batteries. Background Art

[0002] Currently, most electrochemical pre-lithiation is still in the experimental exploration stage. Automatic pre-lithiation of battery cells (the built-in lithium source of the battery cell is short-circuited with the negative electrode) technology is widely used in laboratories, but the static pre-lithiation rate is slow and difficult to control, and the pre-lithiation consistency is poor, making it difficult to meet industrialization conditions.

[0003] In order to solve the problem of slow pre-lithium speed, experimenters have developed a method of rotational vibration of pre-lithium battery cells. Although this method can slightly increase the pre-lithium speed, the one-time manufacturing volume is low, the degree of industrialization is low, and it may cause internal damage to the battery cell. The degree of pre-lithium cannot be controlled, and it is difficult to ensure the consistency of the pre-lithium battery cells.

[0004] Gas will be produced during the automatic pre-lithiation process. If a rubber plug is used to seal and leave it alone, it will not only cause the battery cell to expand, but also lead to insufficient wetting of the electrode, resulting in interface mottling. If the battery is left open and left alone, it will cause electrolyte loss. Utility Model Content

[0005] In order to solve the technical problems existing in the background technology, the utility model proposes a device for accelerating the pre-lithiation of a lithium battery.

[0006] The utility model provides a device for accelerating the pre-lithiation of a lithium battery, comprising a fixed shaft, a battery limiting shaft and a tray; the upper part of the fixed shaft is provided with a plurality of conductive tracks;

[0007] The battery limiting shaft is cylindrical and fixed on the tray. The axis of the battery limiting shaft coincides with the center of the tray. The tray is provided with a battery limiting hoop.

[0008] The fixed shaft is located at the inner ring of the battery limiting shaft, a rotary bearing is installed at the lower part of the fixed shaft, and the lower part of the inner ring of the battery limiting shaft is slidably connected with the fixed shaft through the rotary bearing.

[0009] The outer side wall of the battery limiting shaft is provided with a plurality of limiting grooves, and the limiting grooves and the battery limiting hoop are used for clamping the battery block;

[0010] The battery block is clamped in the limit groove of the battery limit shaft, and the battery block away from the limit groove is limited by the limit hoop to prevent the battery block from being affected by centrifugal force and detaching from the battery limit shaft during rotation. A plurality of pressure arms are rotatably connected to the upper end of the battery limit shaft, each limit groove corresponds to a pressure arm, and each group of pressure arms is provided with an electrical measuring mechanism.

[0011] Driven by a motor, the battery limiting shaft can perform circular motion around the fixed shaft through a rotating bearing. The battery limiting shaft is fixed on the tray, and the pressure arms are distributed above the battery limiting shaft. During application, the pressure arms are manually lifted, the battery is placed into the groove of the battery limiting shaft, and the pressure arms are lowered. At this time, the positive probe and the negative probe on the pressure arms are respectively in contact with the positive and negative electrodes of the battery, and the measuring mechanism measures the parameters of each battery block.

[0012] Preferably, each group of the pressure arms and the limiting grooves are distributed centered on the axis of the battery limiting shaft. Each pressure arm corresponds to a battery block in a limiting groove, and the measuring mechanism on the pressure arm measures each battery block.

[0013] Preferably, the battery limiting shaft can rotate around the fixed shaft, and its driving force source is a motor, and the driving method is through a gear and a transmission mechanism.

[0014] Power is provided by the motor to drive the rotation of the battery limiting shaft, or the battery limiting shaft can also be driven to rotate by means of gear transmission.

[0015] Preferably, a vertically downward force is provided by a tension spring at the end of each group of the pressure arms to press the pressure arms tightly against the positive and negative electrodes of the corresponding battery block to prevent detachment or the generation of a gap.

[0016] Preferably, the measuring mechanism includes a conductive contact, a positive probe, a negative probe, and an electrolyte buffer cup;

[0017] The conductive contacts are sequentially installed on the inner side of the battery limiting shaft. Two conductive contacts correspond to each battery block, and the conductive contacts are not connected;

[0018] The pressure arm is provided with a positive probe, a negative probe, and an electrolyte buffer cup, corresponding to the positive electrode tab, the negative electrode tab, and the liquid injection hole of the battery block respectively. Wires are fixed on the pressure arm to connect the positive probe, the negative probe, and the conductive contact respectively.

[0019] The positive probe and the negative probe on the pressure arm are respectively in contact with the positive and negative electrodes of the battery. The gasket below the electrolyte buffer box corresponds to the battery liquid injection hole, so that the cavity of the electrolyte buffer box is communicated with the battery cavity.

[0020] Preferably, the conductive track surrounding the fixed shaft is an electrical contact track. The electrical contact tracks are insulated from each other and the number corresponds to the total number of the positive and negative electrodes of the battery. Each single track is in a horizontal plane, and each conductive track of the electrical contact track corresponds to a conductive contact. During the operation of the device, each conductive contact performs circular motion around the conductive track and always maintains electrical connection;

[0021] A battery tester is installed at the top of the fixed shaft, and each track of the electrical contact track is connected to the battery tester through a wire.

[0022] The positive and negative probes on the pressure arm collect the battery voltage and are connected through wires to the conductive contact points distributed on the inner wall of the battery limiting shaft. Each conductive contact point corresponds individually to an electrical contact track on the fixed shaft. When the mechanism operates, the conductive contact points move in a circular motion along the electrical contact track, maintaining stable electrical contact at all times. Each electrical contact track is connected by one wire and leads out from the upper end of the electrical contact bearing and then connected to the battery tester. Finally, the battery tester is used to monitor and record the voltage of each battery.

[0023] Preferably, the battery limiting hoop is in a circular structure to prevent the battery from moving during rotation.

[0024] In the present utility model, a device for accelerating the prelithiation of lithium batteries is proposed. Driven by a motor, the battery limiting shaft can perform circular motion around the fixed shaft through a rotating bearing. The battery limiting shaft is fixed on the tray, and the pressure arm is distributed and fixed above the battery limiting shaft. During application, the pressure arm is manually lifted, the battery is placed into the groove of the battery limiting shaft, and the pressure arm is lowered. At this time, the positive and negative probes on the pressure arm are respectively in contact with the positive and negative electrodes of the battery, and the gasket below the electrolyte buffer box corresponds to the battery liquid injection hole, so that the cavity of the electrolyte buffer box is communicated with the cavity of the battery.

[0025] The positive and negative probes on the pressure arm collect the battery voltage and are connected through wires to the conductive contact points distributed on the inner wall of the battery limiting shaft. Each conductive contact point corresponds individually to an electrical contact track on the fixed shaft. When the mechanism operates, the conductive contact points move in a circular motion along the electrical contact track, maintaining stable electrical contact at all times. Each electrical contact track is connected by one wire and leads out from the upper end of the electrical contact bearing and then connected to the battery tester. Finally, the battery tester is used to monitor and record the voltage of each battery.

[0026] The additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the present utility model;

[0028] Figure 2 It is a schematic diagram of the internal electrical connection structure of the present utility model;

[0029] Explanation of the reference numerals in the figure: 1. Tray; 101. Battery limiting hoop; 2. Battery block; 3. Fixed shaft; 301. Conductive track; 302. Rotating bearing; 303. Battery tester; 4. Pressure arm; 401. Positive probe; 402. Electrolyte buffer cup; 403. Negative probe; 5. Battery limiting shaft; 501. Conductive contact point. Detailed implementation manners

[0030] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar symbols represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0031] As Figure 1 - Figure 2 shown, a device for accelerating the prelithiation of a lithium battery includes a fixed shaft 3, a battery limiting shaft 5 and a tray 1; a plurality of conductive tracks 301 are provided on the upper part of the fixed shaft 3;

[0032] The battery limiting shaft 5 is in a cylindrical shape and is fixed on the tray 1. The axis of the battery limiting shaft 5 coincides with the center of the tray 1. A battery limiting hoop 101 is provided on the tray 1. A plurality of limiting grooves are formed on the outer side wall of the battery limiting shaft 5. The limiting grooves and the battery limiting hoop 101 are used for clamping the battery block 2;

[0033] The fixed shaft 3 is located inside the battery limiting shaft 5. A rotary bearing 302 is installed at the lower part of the fixed shaft 3. The lower part of the inner circle of the battery limiting shaft 5 is slidably connected to the fixed shaft 3 through the rotary bearing 302. A plurality of pressure arms 4 are rotatably connected to the upper end of the battery limiting shaft 5. Each limiting groove corresponds to a pressure arm 4. A power measuring mechanism is provided on each group of the pressure arms 4.

[0034] Preferably, each group of the pressure arms 4 and the limiting grooves are distributed centered on the axis of the battery limiting shaft 5.

[0035] Preferably, the battery limiting shaft 5 can rotate around the fixed shaft 3, and its driving force source is a motor. The driving mode includes but is not limited to gear and transmission mechanism transmission.

[0036] Preferably, a vertically downward force is provided by a tension spring at the end of each group of the pressure arms 4.

[0037] Preferably, the power measuring mechanism includes a conductive contact 501, a positive probe 401, a negative probe 403 and an electrolyte buffer cup 402;

[0038] The conductive contacts 501 are sequentially distributed and installed on the inner side of the battery limiting shaft 5. Two conductive contacts 501 correspond to each battery block 2, and the conductive contacts 501 are not connected;

[0039] The pressure arm 4 is provided with a positive probe 401, a negative probe 403 and an electrolyte buffer cup 402, which respectively correspond to the positive electrode tab, the negative electrode tab and the liquid injection hole of the battery block 2. Wires are fixed on the pressure arm 4 and are respectively connected to the positive probe 401, the negative probe 403 and the conductive contact 501.

[0040] Preferably, the conductive track 301 around the fixed shaft 3 is an electrical contact track. The electrical contact tracks are insulated from each other and the number corresponds to the total number of the positive and negative poles of the battery. Each single track is in a horizontal plane. Each conductive track 301 of the electrical contact track corresponds to a conductive contact 501. When the device operates, each conductive contact 501 makes a circular motion around the conductive track 301 to maintain electrical connection at all times;

[0041] A battery tester 303 is installed at the top of the fixed shaft 3. Each track of the electrical contact track is connected to the battery tester 303 through a wire.

[0042] Preferably, the battery limiting hoop 101 is of a circular structure to prevent the battery from moving during rotation.

[0043] During the working process of this embodiment: Driven by the motor, the battery limiting shaft 5 can make a circular motion around the fixed shaft 3 through the rotary bearing 302. The battery limiting shaft 5 is fixed on the tray 1 and the pressure arms 4 are distributed and fixed above the battery limiting shaft 5. During application, manually lift the pressure arm 4, place the battery into the groove of the battery limiting shaft 5, and lower the pressure arm 4. At this time, the positive probe 401 and the negative probe 403 on the pressure arm 4 are respectively in contact with the positive and negative poles of the battery, and the gasket below the electrolyte buffer box corresponds to the battery liquid injection hole, so that the cavity of the electrolyte buffer box is communicated with the battery cavity.

[0044] The positive probe 401 and the negative probe 403 on the pressure arm 4 collect the battery voltage and are connected to the conductive outlet contacts distributed on the inner wall of the battery limiting shaft 5 through wires. Each conductive contact 501 individually corresponds to an electrical contact track on the fixed shaft 3. When the mechanism operates, the conductive contact 501 makes a circular motion along the electrical contact track to maintain stable electrical contact at all times. Each electrical contact track has 1 wire connected and led out from the upper end of the electrical contact bearing and then connected to the battery tester 303. Finally, the battery tester 303 is used to monitor and record the voltage of each battery.

[0045] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0047] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0049] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A device for accelerating the prelithiation of a lithium battery, characterized in that: It includes a fixed shaft (3), a battery limiting shaft (5) and a tray (1); several conductive tracks (301) are provided on the upper part of the fixed shaft (3); The battery limiting shaft (5) is cylindrical in shape and is fixed on the tray (1). The axis of the battery limiting shaft (5) coincides with the center of the tray (1). A battery limiting hoop (101) is provided on the tray (1); The fixed shaft (3) is located inside the battery limiting shaft (5). A rotary bearing (302) is installed at the lower part of the fixed shaft (3). The lower part of the inner circle of the battery limiting shaft (5) is slidably connected to the fixed shaft (3) through the rotary bearing (302).

2. The device for accelerating the prelithiation of a lithium battery according to claim 1, wherein: Several limiting grooves are provided on the outer side wall of the battery limiting shaft (5). The limiting grooves and the battery limiting hoop (101) are used to clamp the battery block (2). Several pressure arms (4) are rotatably connected to the upper end of the battery limiting shaft (5). Each limiting groove corresponds to a pressure arm (4). A power measuring mechanism is provided on each group of the pressure arms (4).

3. The device for accelerating the prelithiation of a lithium battery according to claim 2, characterized in that: Each group of the pressure arms (4) and the limiting grooves are distributed centered on the axis of the battery limiting shaft (5).

4. The device for accelerating the prelithiation of a lithium battery according to claim 1, characterized in that: The battery limiting shaft (5) can rotate around the fixed shaft (3). Its driving force source is a motor, and the driving method is through a gear and a transmission mechanism.

5. The device for accelerating the prelithiation of a lithium battery according to claim 2, wherein: A vertically downward force is provided by a tension spring at the end of each group of the pressure arms (4).

6. The device for accelerating the prelithiation of a lithium battery according to claim 2, wherein: The power measuring mechanism includes a conductive contact (501), a positive probe (401), a negative probe (403) and an electrolyte buffer cup (402); The conductive contacts (501) are sequentially installed on the inner side of the battery limiting shaft (5). Each battery block (2) corresponds to 2 conductive contacts (501), and the conductive contacts (501) are not connected; The positive probe (401), the negative probe (403) and the electrolyte buffer cup (402) are provided on the pressure arm (4), corresponding to the positive ear, the negative ear and the liquid injection hole of the battery block (2) respectively. Wires are fixed on the pressure arm (4) to connect the positive probe (401), the negative probe (403) and the conductive contact (501) respectively.

7. An apparatus for accelerating the prelithiation of a lithium battery according to claim 6, characterized in that: The conductive tracks (301) surrounding the fixed shaft (3) are electrical contact tracks. The electrical contact tracks are insulated from each other and the number corresponds to the total number of battery positive and negative poles. Each single track is in a horizontal plane. Each conductive track (301) of the electrical contact track corresponds to a conductive contact (501). When the device is running, each conductive contact (501) makes a circular motion around the conductive track (301) and always maintains electrical connection; A battery tester (303) is installed at the top of the fixed shaft (3). Each track of the electrical contact track is connected to the battery tester (303) through a wire.

8. The device for accelerating the prelithiation of a lithium battery according to claim 2, wherein: The battery limiting hoop (101) is a circular structure to prevent the battery from moving during rotation.

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