Rapid deep discharge treatment method for lithium battery

Abstract

The invention relates to the technical field of lithium battery recycling and discharging, and particularly discloses a rapid and deep discharging treatment method for a lithium battery, which comprises the following steps: S1, connecting the positive and negative electrodes of the lithium battery with a discharging load through a wire to form a closed electric loop; s2, monitoring voltage and temperature at two ends of the lithium battery in the discharging process; s3, a first threshold value and a second threshold value for controlling the circuit to be disconnected are set in the control terminal, the circuit is disconnected when the voltage value is lower than the first threshold value, and the circuit is disconnected when the temperature value is higher than the second threshold value; the discharging load is communicated with the positive electrode and the negative electrode of the lithium battery through the wires, residual electric quantity of the lithium battery is quickly discharged through the discharging load, and the discharging efficiency of the lithium battery is effectively improved; in addition, the lithium battery does not need to be immersed in saline water, the saline water does not need to be recycled, and the discharging cost of the lithium battery is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery recovery and discharge, and in particular to a method for rapid deep discharge processing of lithium batteries. Background Art

[0002] There is usually a certain amount of residual power left in the used lithium batteries. Before dismantling the used lithium batteries, they need to be discharged first.

[0003] At present, the industry mostly adopts salt water discharge method, but the salt water discharge method has a slow discharge speed, generally more than 3 days, and low efficiency. The lithium battery needs to be immersed in salt water, and heavy metals, electrolytes and other harmful substances will remain in the liquid during the process. The subsequent comprehensive treatment is complicated and uneconomical.

[0004] Therefore, a more environmentally friendly and rapid lithium battery discharge treatment method is now proposed. Summary of the invention

[0005] In view of the above problems in the prior art, the present invention provides a method for rapid deep discharge processing of a lithium battery, the purpose of which is to reduce the discharge cost of the lithium battery and improve the discharge efficiency of the lithium battery.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0007] A method for rapid deep discharge of a lithium battery is provided, comprising the following steps: S1. connecting the positive and negative electrodes of the lithium battery and the discharge load through a wire to form a closed electrical circuit; S2. monitoring the voltage and temperature of the two ends of the lithium battery during the discharge process; S3. setting a first threshold and a second threshold for disconnecting the control circuit in a control terminal, disconnecting the circuit when the voltage value is lower than the first threshold, and disconnecting the circuit when the temperature value is higher than the second threshold.

[0008] Furthermore, the method also includes: a first voltmeter, connected in parallel to the two ends of the lithium battery, for detecting the voltage U1 at the two ends of the lithium battery; a second voltmeter, connected in parallel to the two ends of the discharge load, for detecting the voltage U2 at the two ends of the discharge load; an infrared temperature detector, for detecting the temperature of the lithium battery; an adjustment component, which can change the resistance R of the discharge load until U1=U2.

[0009] Furthermore, the discharge load is spherical conductive particles; wherein the regulating component includes: a storage component, in which a storage channel is opened in the vertical direction, and a plurality of discharge loads are stored in the storage channel; a functional component, in which a load channel is opened in the vertical direction for stacking the discharge loads; a first resistance component, slidably disposed in the load channel, for contacting the top of the discharge load; a second contact component, disposed on one side of the load channel, for contacting the side of the discharge load; and the first contact component and the second contact component are connected to the positive and negative electrodes of the lithium battery; a rotating component, rotatably disposed below the storage component and the functional component, for blocking the storage channel and the load channel; a receiving channel, opened on the rotating component in the vertical direction; a piston, slidably disposed in the receiving channel; a telescopic component, for driving the piston to move; a first drive motor, for driving the rotating component to rotate, thereby driving the receiving channel to connect to the storage channel / load channel.

[0010] Furthermore, a first spring is provided at one end of the first contact component away from the discharge load.

[0011] Furthermore, the first base component and the second contact component are both made of copper, the second contact component is an O-shaped spring sheet, and the second contact component has a tendency to extend toward the inside of the load channel.

[0012] Furthermore, the adjustment component also includes: a plurality of slide grooves, which are arranged in an array along the vertical direction on the functional component; a connecting component, which is slidably arranged in the slide groove and can be inserted into / exited from the load channel; two arc-shaped surfaces, which are symmetrically arranged on the connecting component up and down, and are respectively used to contact two adjacent discharge loads up and down; and a driving component, which is used to drive the connecting component to slide.

[0013] Furthermore, the driving component includes: a push rod, which is slidably arranged on a side of the connecting component away from the discharge load along the vertical direction; a first inclined surface, which is arranged on the connecting component; a second inclined surface, which is arranged on the push rod, and the first inclined surface and the second inclined surface can be in sliding contact; a second spring, one end of which abuts against the functional component and the other end of which abuts against the connecting component, providing the connecting component with a tendency to move in a direction away from the discharge load; a gear and a rack, which are meshed and installed, the rack is arranged on the push rod, and the gear is arranged on the output shaft of the second drive motor.

[0014] Furthermore, the telescopic component is a hydraulic cylinder, the main body of the hydraulic cylinder is fixedly arranged on the rotating component, and the telescopic rod of the hydraulic cylinder is connected to the piston.

[0015] The beneficial effects of the present invention are as follows: in the present invention, by connecting the discharge load to the positive and negative electrodes of the lithium battery through a wire, the residual power of the lithium battery is quickly discharged through the discharge load, thereby effectively improving the discharge efficiency of the lithium battery; in addition, there is no need to immerse the lithium battery in salt water, and there is no need to recycle the salt water, thereby reducing the discharge cost of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the circuit structure provided for this embodiment.

[0017] Figure 2 A schematic diagram of the structure of the adjustment component provided in this embodiment.

[0018] Figure 3 for Figure 2 An enlarged schematic diagram of point A.

[0019] Figure 4 for Figure 2 An enlarged schematic diagram of point B.

[0020] Among them, 1. lithium battery; 2. control terminal; 21. first voltmeter; 22. second voltmeter; 23. infrared temperature detector; 3. discharge load; 41. storage component; 42. functional component; 43. first resistance component; 44. second resistance component; 45. rotating component; 46. receiving channel; 47. piston; 48. telescopic component; 49. first drive motor; 51. first spring; 52. connecting component; 53. arc surface; 54. push rod; 55. first inclined surface; 56. second inclined surface; 57. second spring; 58. gear; 61. first mounting seat; 62. second mounting seat; 63. cylinder. DETAILED DESCRIPTION

[0021] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Reference Figure 1 As shown, an embodiment of the present invention provides a method for rapid deep discharge processing of a lithium battery, comprising the following steps: S1. connecting the positive and negative electrodes of the lithium battery 1 and the discharge load 3 through a wire to form a closed electrical circuit; S2. monitoring the voltage and temperature at both ends of the lithium battery 1 during the discharge process; S3. setting a first threshold and a second threshold for disconnecting the control circuit in the control terminal 2, disconnecting the circuit when the voltage value is lower than the first threshold, and disconnecting the circuit when the temperature value is higher than the second threshold.

[0023] In the present invention, the discharge load 3 is connected to the positive and negative electrodes of the lithium battery 1 through a wire, and the residual power of the lithium battery 1 is quickly discharged through the discharge load 3, thereby effectively improving the discharge efficiency of the lithium battery 1; in addition, there is no need to immerse the lithium battery 1 in salt water, and there is no need to recycle the salt water, thereby reducing the discharge cost of the lithium battery 1.

[0024] Specifically, the method also includes: a first voltmeter 21, connected in parallel to the two ends of the lithium battery 1, for detecting the voltage U1 at the two ends of the lithium battery 1; a second voltmeter 22, connected in parallel to the two ends of the discharge load 3, for detecting the voltage U2 at the two ends of the discharge load 3; an infrared temperature detector 23, for detecting the temperature of the lithium battery 1; an adjustment component, which can change the resistance R of the discharge load 3 until U1=U2.

[0025] Moreover, in the present invention, the temperature of the lithium battery 1 is monitored in real time by an infrared temperature detector 23. When the temperature of the lithium battery 1 is higher than the second threshold value set in the control end point, the control terminal 2 transmits an electrical signal to the switch of the circuit to disconnect the switch to prevent the temperature of the lithium battery 1 from getting out of control or even catching fire. The voltage change in the lithium battery 1 is also monitored in real time by a first voltmeter 21. When the value of U1 is less than the first threshold value, the control terminal 2 also transmits an electrical signal to the switch of the circuit to disconnect the switch to complete the discharge work.

[0026] It is worth mentioning that as the use time of the lithium battery 1 increases, the internal resistance of the lithium battery 1 gradually increases.

[0027] In the present invention, by adjusting the value of the resistance R of the discharge load 3 , the resistance R of the discharge load 3 can be made close to the internal resistance of the lithium battery 1 .

[0028] Preferably, until the resistance R of the discharge load 3 is equal to the internal resistance of the lithium battery 1 , the output power of the lithium battery 1 can be maximized, and the discharge efficiency of the lithium battery 1 can be effectively improved.

[0029] The discharge load 3 is spherical conductive particles; the material used to make the discharge load 3 includes one or more of acetylene black, carbon fiber, superconductive carbon black, graphite, copper powder, silver powder, aluminum powder, and zinc powder.

[0030] Reference Figure 2As shown, the regulating assembly includes: a storage component 41, in which a storage channel is opened in the vertical direction, and a plurality of discharge loads 3 are stored in the storage channel; a functional component 42, in which a load channel is opened in the vertical direction for the discharge loads 3 to be stacked; a first resistance component 43, which is slidably arranged in the load channel, and is used to contact the top of the discharge load 3; a second contact component, which is arranged on one side of the load channel, and is used to contact the side of the discharge load 3; and the first contact component and the second contact component are connected to the positive and negative electrodes of the lithium battery 1; a rotating component 45, which is rotatably arranged below the storage component 41 and the functional component 42, and is used to block the storage channel and the load channel; a receiving channel 46, which is opened on the rotating component 45 in the vertical direction; a piston 47, which is slidably arranged in the receiving channel 46; a telescopic component 48, which is used to drive the piston 47 to move; a first driving motor 49, which is used to drive the rotating component 45 to rotate, so as to drive the receiving channel 46 to connect to the storage channel / load channel.

[0031] Specifically, the first drive motor 49 can be driven by the gear 58 to drive and connect the rotating component 45 and the output shaft of the first motor.

[0032] Reference Figure 2 and Figure 3 As shown, when the output shaft of the first drive motor 49 rotates, it can drive the receiving channel 46 to connect with the storage channel, and under the action of gravity, the discharge load 3 in the storage channel falls into the receiving channel 46; the output shaft of the first drive motor 49 is reversed, and the receiving channel 46 and the load channel are connected, and then the piston 47 is driven by the telescopic component 48 to move close to the load channel until the discharge load 3 is pushed into the load channel; by repeating the above process different times, different numbers of discharge loads 3 can be stacked in the load channel; similarly, in the present invention, the discharge load 3 can also be sent back from the load channel to the storage channel to reduce the number of discharge loads 3 stacked in the load channel; until the value of U2 approaches U1 to the maximum extent, thereby improving the discharge efficiency of the lithium battery 1.

[0033] It is worth mentioning that the depth of the receiving channel 46 can be changed by moving the piston 47 through the telescopic component 48, so that different numbers of discharge loads 3 can fall into the receiving channel 46; preferably, the depth of the receiving channel 46 should be an integer multiple of the diameter of the discharge load 3.

[0034] Specifically, the telescopic component 48 is a hydraulic cylinder, the main body of the hydraulic cylinder is fixedly arranged on the rotating component 45, the telescopic rod of the hydraulic cylinder is connected to the piston 47, and the telescopic rod can be driven to perform stable telescopic movement by injecting oil into the hydraulic cylinder in both directions.

[0035] In this embodiment, the first driving motor 49 performs a 180° reciprocating rotation motion.

[0036] Specifically, a first spring 51 is provided at one end of the first contact component away from the discharge load 3, and the first spring 51 is always in a compressed state, providing the first contact component with a tendency to move closer to the discharge load 3; the first base component and the second contact component are both made of copper, and the second contact component is an O-shaped spring sheet, and the second contact component has a tendency to extend toward the load channel; it is ensured that both the first contact component and the second contact component can be connected to the discharge load 3, and the circuit is closed.

[0037] Among them, the adjustment component also includes: a plurality of slide grooves, which are arranged in an array along the vertical direction on the functional component 42; a connecting component 52, which is slidably arranged in the slide groove and can be inserted into / exited from the load channel; two arc-shaped surfaces 53, which are symmetrically arranged on the connecting component 52 up and down, and are respectively used to contact two adjacent discharge loads 3 up and down; a driving component, which is used to drive the connecting component 52 to slide.

[0038] Specifically, the driving component includes: a push rod 54, which is slidably arranged on the side of the connecting component 52 away from the discharge load 3 along the vertical direction; a first inclined surface 55, which is arranged on the connecting component 52; a second inclined surface 56, which is arranged on the push rod 54, and the first inclined surface 55 and the second inclined surface 56 can be in sliding contact; a second spring 57, one end of which abuts against the functional component 42, and the other end abuts against the connecting component 52, providing the connecting component 52 with a tendency to move in a direction away from the discharge load 3; a gear 58 and a rack, which are meshed and installed, the rack is arranged on the push rod 54, and the gear 58 is arranged on the output shaft of the second drive motor.

[0039] Specifically, the connecting component 52 is made of the same material as the discharge load 3. By rotating the second drive motor (not shown in the figure), the push rod 54 can be driven to move upward. Under the guidance of the first inclined surface 55 and the second inclined surface 56, the connecting component 52 squeezes the second spring 57 until the connecting component 52 is inserted between two adjacent discharge loads 3 above and below, which can further improve the adjustment range of the size of the resistor R connected to the discharge load 3, thereby improving the scope of application of the present invention.

[0040] It can be understood that by changing the height to which the push rod 54 moves, the number of connecting components 52 inserted into the load passage can be changed.

[0041] Specifically, a fixed first mounting seat 61 and a second mounting seat 62 that can slide in a vertical direction are also provided on the rotating component 45, and a cylinder 63 for driving the second mounting seat 62 to slide is also provided. The cylinder 63 drives the second mounting seat 62 to slide toward the direction close to the first mounting seat 61, so as to clamp the lithium battery 1.

[0042] It can be understood that metal sheets connecting the first contact component and the second contact component are respectively arranged on the first mounting seat 61 and the second mounting seat 62, and the two metal sheets contact the positive and negative electrodes of the lithium battery 1 respectively, so as to form a closed circuit.

[0043] It is worth mentioning that the control terminal 2 can realize the opening and closing of the discharge circuit by controlling the extension and contraction of the cylinder 63 .

[0044] Of course, in order to limit the temperature rise of the lithium battery 1 and the discharge load 3, a fan can be used to blow air to the surface of the lithium battery 1 and the discharge load 3 to increase the air flow rate, delay the temperature rise, and ensure the discharge efficiency.

[0045] It should be understood by those skilled in the art that, although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments once those skilled in the art are aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and the equivalent technology, the present invention is also intended to include these modifications and variations.

Claims

1. A method for rapid deep discharge of a lithium battery, characterized in that: The following steps are involved: S1. The positive and negative electrodes of the lithium battery (1) and the discharge load (3) are connected through wires to form a closed electrical circuit; S2. During the discharge process, monitoring the voltage and temperature across the lithium battery (1); S3. A first threshold and a second threshold for disconnecting the control circuit are set in the control terminal (2). The circuit is disconnected when the voltage value is lower than the first threshold, and the circuit is disconnected when the temperature value is higher than the second threshold.

2. The rapid deep discharge processing method of a lithium battery according to claim 1, characterized in that: Also includes: A first voltmeter (21), connected in parallel to both ends of the lithium battery (1), and used to detect a voltage U1 at both ends of the lithium battery (1); A second voltmeter (22) is connected in parallel to both ends of the discharge load (3) and is used to detect a voltage U2 at both ends of the discharge load (3); An infrared temperature detector (23) for detecting the temperature of the lithium battery (1); The adjustment component can change the resistance R of the discharge load (3) until U1 = U2.

3. The rapid deep discharge processing method of a lithium battery according to claim 2, characterized in that: The discharge load (3) is spherical conductive particles; The adjustment components include: A storage component (41), wherein a storage channel is provided in the storage component (41) in a vertical direction, and a plurality of discharge loads (3) are stored in the storage channel; A functional component (42), wherein a load channel is provided in the functional component (42) along a vertical direction for stacking the discharge load (3); A first abutting member (43) is slidably disposed in the load channel and is used to contact the top of the discharge load (3); A second contact component is arranged at one side of the load channel and is used to contact a side of the discharge load (3); The first contact component and the second contact component are connected to the positive and negative electrodes of the lithium battery (1); A rotating component (45) is rotatably disposed below the storage component (41) and the functional component (42) and is used to block the storage channel and the load channel; A receiving channel (46) is vertically opened on the rotating component (45); A piston (47) slidably disposed in the receiving passage (46); A telescopic member (48) for driving the piston (47) to move; The first driving motor (49) is used to drive the rotating component (45) to rotate, thereby driving the receiving channel (46) to connect with the storage channel / load channel.

4. The rapid deep discharge treatment method for a lithium battery according to claim 3, characterized in that: A first spring (51) is provided at one end of the first contact component away from the discharge load (3).

5. The rapid deep discharge treatment method for lithium batteries according to claim 3, characterized in that: The first base component and the second contact component are both made of copper. The second contact component is an O-shaped spring sheet. The second contact component has a tendency to extend toward the inside of the load channel.

6. The rapid deep discharge treatment method for a lithium battery according to claim 3, characterized in that: The adjustment components also include: A plurality of slide grooves are arranged in an array along a vertical direction on the functional component (42); A connecting member (52) is slidably disposed in the slide slot and can be inserted into / withdrawn from the load channel; Two arc-shaped surfaces (53) are symmetrically arranged on the connecting component (52) and are used to contact two upper and lower adjacent discharge loads (3) respectively; The driving component is used for driving the connecting component (52) to slide.

7. The rapid deep discharge processing method of a lithium battery according to claim 6, characterized in that: The drive components include: A push rod (54) is slidably disposed on a side of the connecting component (52) away from the discharge load (3) in a vertical direction; A first inclined surface (55) is disposed on the connecting component (52); A second inclined surface (56) is disposed on the push rod (54), and the first inclined surface (55) and the second inclined surface (56) are capable of sliding contact; A second spring (57), one end of which abuts against the functional component (42) and the other end of which abuts against the connecting component (52), providing the connecting component (52) with a tendency to move in a direction away from the discharge load (3); The gear (58) and the rack are engaged and installed, the rack is arranged on the push rod (54), and the gear (58) is arranged on the output shaft of the second driving motor.

8. The rapid deep discharge processing method of a lithium battery according to claim 3, characterized in that: The telescopic component (48) is a hydraulic cylinder, the main body of which is fixedly arranged on the rotating component (45), and the telescopic rod of the hydraulic cylinder is connected to the piston (47).

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