Battery discharge processing device and discharge method

Abstract

The application provides a battery discharge processing device and a discharge method. The battery discharge processing device comprises a first loop and a second loop for controlling the conduction or disconnection of the first loop. The first loop comprises a load resistor and a first metal oxide semiconductor field effect transistor connected in series. The first metal oxide semiconductor field effect transistor and the load resistor are used to be electrically connected with a power source to be discharged. The first metal oxide semiconductor field effect transistor is used to connect or cut off the first loop. The second loop comprises the power source to be discharged and a second metal oxide semiconductor field effect transistor electrically connected with the power source to be discharged. When the voltage of the power source to be discharged is less than the threshold voltage of the second metal oxide semiconductor field effect transistor, the second metal oxide semiconductor field effect transistor cannot be conducted. The first metal oxide semiconductor field effect transistor is controlled to be cut off, so that the first loop is disconnected, the risk of over-discharge of the power source to be discharged is reduced, and the power source to be discharged is subsequently disassembled.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more specifically to a battery discharge processing device and discharge method. Background Technology

[0002] When lithium batteries are scrapped, they often need to be discharged to release their residual energy and reduce safety risks during transportation or subsequent dismantling. Current lithium battery discharge technologies mainly include salt solution immersion, needle penetration discharge, and discharge using specialized battery charging and discharging equipment. Using specialized equipment involves significant investment, and the batteries being processed have already undergone testing or use, posing a higher risk and requiring strict safety standards for the processing site and process. Salt solution immersion or puncture discharge consumes energy through electrolysis or short circuits, producing gases or electrolytes that require waste gas treatment. Furthermore, salt solution immersion necessitates the purchase of industrial salt and wastewater treatment, increasing processing costs. To reduce costs, direct resistance discharge is a simpler method, but it typically lacks voltage control, often leading to over-discharge of the lithium batteries, which is detrimental to subsequent dismantling. Summary of the Invention

[0003] In view of this, this application provides a battery discharge treatment device and discharge method to solve the problem that waste lithium batteries are over-discharged during the discharge process, which is not conducive to the subsequent dismantling of waste lithium batteries.

[0004] The first aspect of this application provides a battery discharge processing device, which includes a first circuit and a second circuit for controlling the first circuit to be turned on or off. The first circuit includes a load resistor and a first metal-oxide-semiconductor field-effect transistor connected in series. The first metal-oxide-semiconductor field-effect transistor and the load resistor are used to be electrically connected to the power supply to be discharged. The first metal-oxide-semiconductor field-effect transistor is used to connect or disconnect the first circuit.

[0005] The second circuit includes the power supply to be discharged and a second metal-oxide-semiconductor field-effect transistor electrically connected to the power supply to be discharged;

[0006] Wherein, the drain of the second metal-oxide-semiconductor field-effect transistor is used to be electrically connected to the gate of the first metal-oxide-semiconductor field-effect transistor, the gate of the second metal-oxide-semiconductor field-effect transistor is used to be electrically connected to the positive terminal of the power supply to be discharged, and the source of the second metal-oxide-semiconductor field-effect transistor is grounded.

[0007] The drain of the first metal-oxide-semiconductor field-effect transistor is electrically connected to the positive terminal of the power supply to be discharged, and the source of the first metal-oxide-semiconductor field-effect transistor is electrically connected to the negative terminal of the power supply to be discharged.

[0008] When the power supply to be discharged is connected to the battery discharge processing device, since the positive terminal of the power supply is electrically connected to the gate of the second metal-oxide-semiconductor field-effect transistor (MOSFET), a voltage is applied to the gate so that the voltage (Vgs) of the gate relative to its source of the second MOSFET exceeds its threshold voltage (Vth), thereby turning on the drain and source of the second MOSFET. Simultaneously, the drain of the second MOSFET is electrically connected to the gate of the first MOSFET. At this time, the drain of the second MOSFET can apply a voltage to the gate of the first MOSFET, thereby turning on the drain and source of the first MOSFET, thus turning on the first MOSFET. This, in turn, completes the first circuit, allowing the power supply to discharge through the load resistor, which improves the discharge efficiency of the power supply.

[0009] The threshold voltage (Vth) of the second metal-oxide-semiconductor field-effect transistor (MOSFET) can be the lower discharge limit voltage of the power supply to be discharged. As the discharge time increases, the voltage of the power supply to be discharged gradually decreases. When the voltage applied by the power supply to the gate of the second MOSFET is less than the threshold voltage (Vth) of the second MOSFET, the source and drain of the second MOSFET are cut off, i.e., they cannot conduct, so that the second circuit cannot conduct. Thus, the drain of the second MOSFET cannot apply a voltage to the gate of the first MOSFET, so that the drain and source of the first MOSFET are cut off, so that the first circuit cannot conduct. This can prevent the power supply to be discharged from continuing to discharge, thereby reducing the risk of over-discharge, reducing the risk of corrosion of the negative current collector of the power supply to be discharged and the risk of expansion of the power supply to be discharged, reducing the difficulty of subsequent disassembly of the power supply to be discharged, and thus reducing the difficulty of material disassembly and recycling, making it easier for the power supply to be discharged to be recycled and processed.

[0010] In this scheme, when the voltage of the power supply to be discharged is greater than the threshold voltage (Vth) of the second metal-oxide-semiconductor field-effect transistor (MOSFET), the second MOSFET is turned on, and thus the second MOSFET can be used to control the first MOSFET to turn on. When the voltage of the power supply to be discharged is less than the threshold voltage (Vth) of the second MOSFET, the second MOSFET cannot be turned on, and thus the second MOSFET can control the first MOSFET to turn off. This allows the first circuit to be automatically disconnected when the discharge voltage of the power supply to be discharged is low, avoiding the risk of over-discharge caused by personnel not removing the power supply to be discharged from the battery discharge processing device in time. In other words, it reduces the risk of the discharge voltage of the power supply to be discharged being less than the lower discharge limit voltage, thereby reducing the risk of corrosion of the negative current collector of the power supply to be discharged and the risk of expansion of the power supply to be discharged, facilitating subsequent disassembly and improving the safety of use. Therefore, the second metal-oxide-semiconductor field-effect transistor can control the conduction and cutoff of the first metal-oxide-semiconductor field-effect transistor, thereby controlling the automatic conduction or cutoff of the first circuit without manual operation, improving the convenience of the battery discharge processing device for discharging the power supply to be discharged.

[0011] In this scheme, both the first metal-oxide-semiconductor field-effect transistor and the second metal-oxide-semiconductor field-effect transistor are N-channel enhancement-mode metal-oxide-semiconductor field-effect transistors.

[0012] In this solution, the battery discharge processing device further includes a thermal protector, which is used to disconnect the first circuit when the temperature of the first circuit reaches a preset temperature, and to connect the first circuit when the temperature of the first circuit is lower than the preset temperature.

[0013] The thermal protector is a positive temperature coefficient thermistor; and / or, the thermal protector is attached to the surface of the load resistor.

[0014] In this solution, the battery discharge processing device further includes an indicator component, which is connected in parallel with the first circuit or in parallel with the thermal protector, and is used to indicate whether the discharge is complete.

[0015] The indicating component is connected in parallel with the thermal protector, or the indicating component is connected in parallel with the first circuit between the thermal protector and the power supply to be discharged.

[0016] In this scheme, the indicator component includes a light-emitting diode and a first resistor connected in series with the light-emitting diode. The indicator component is used to be connected in parallel across the two ends of the power supply to be discharged to form a third circuit.

[0017] In this scheme, one end of the indicator component is electrically connected to the positive terminal of the power supply to be discharged, and the other end of the indicator component is electrically connected to the load resistor. The indicator component and the load resistor are connected in series with the power supply to be discharged to form a third circuit.

[0018] In this solution, the power source to be discharged is a single battery cell, a battery module, a battery pack, or an energy storage system.

[0019] A second aspect of this application also provides a discharge method, wherein the discharge method employs the battery discharge processing device described above.

[0020] The power source to be discharged is electrically connected to the battery discharge processing device;

[0021] When the second metal-oxide-semiconductor field-effect transistor is turned on, the first circuit is turned on, and the power supply to be discharged discharges through the load resistor on the first circuit.

[0022] When the discharge voltage of the power supply to be discharged is lower than the threshold voltage of the second metal-oxide-semiconductor field-effect transistor, the first circuit is disconnected.

[0023] Wherein, the threshold voltage of the first metal-oxide-semiconductor field-effect transistor is less than or equal to the threshold voltage of the second metal-oxide-semiconductor field-effect transistor.

[0024] In this solution, the battery discharge processing device includes a thermal protector. During the discharge process of the power supply to be discharged through the load resistor on the first circuit, when the temperature of the first circuit is greater than the preset temperature, the thermal protector disconnects to disconnect the first circuit.

[0025] When the temperature of the first circuit is lower than the preset temperature, and when the discharge voltage of the power supply to be discharged is greater than the threshold voltage of the second metal-oxide-semiconductor field-effect transistor, the thermal protector closes to make the first circuit conduct.

[0026] In this solution, the battery discharge processing device further includes an indicator component. When the power supply to be discharged begins to discharge, the indicator component lights up, and when the power supply to be discharged completes its discharge, the indicator component turns off.

[0027] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the battery discharge treatment device provided in this application in a specific embodiment;

[0030] Figure 2 This is a schematic diagram of the battery discharge treatment device provided in this application in another specific embodiment;

[0031] Figure 3 This is a schematic diagram of the battery discharge treatment device provided in this application in another specific embodiment;

[0032] Figure 4 This is a schematic diagram of the battery discharge treatment device provided in this application in another specific embodiment.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1-Battery discharge treatment device;

[0035] 11-First metal-oxide-semiconductor field-effect transistor;

[0036] 12-Second metal-oxide-semiconductor field-effect transistor;

[0037] 13 - Load resistance;

[0038] 14-Indicator components;

[0039] 141 - Light Emitting Diode;

[0040] 142 - First resistor;

[0041] 15 - Thermal protector;

[0042] 16 - Power supply to be discharged. Detailed Implementation

[0043] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0044] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0045] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0046] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0047] When lithium batteries are scrapped, they often need to be discharged to release their residual energy, thereby reducing the risk of short circuits, arcing, and subsequent fires or explosions during transportation or dismantling. Current lithium battery discharge technologies mainly include salt solution immersion, needle penetration discharge, and discharge using battery charging and discharging equipment. However, these technologies often result in over-discharge of the scrapped lithium batteries. Furthermore, the negative electrode current collector of scrapped lithium batteries is usually copper foil, which easily leads to corrosion of the negative electrode current collector, increasing the difficulty of subsequent dismantling. Simultaneously, over-discharge can also cause the scrapped lithium batteries to expand, increasing the internal pressure and further complicating dismantling.

[0048] To address the aforementioned technical problems, this application provides a battery discharge processing device 1, such as... Figure 1 and Figure 2 As shown, the battery discharge processing device 1 includes a first circuit and a second circuit for controlling the first circuit to be turned on or off. The first circuit includes a load resistor 13 and a first metal-oxide-semiconductor field-effect transistor 11 connected in series. The first metal-oxide-semiconductor field-effect transistor 11 and the load resistor 13 are used to be electrically connected to the power supply 16 to be discharged. The first metal-oxide-semiconductor field-effect transistor 11 is used to connect or disconnect the first circuit.

[0049] The second circuit includes a power supply 16 to be discharged and a second metal-oxide-semiconductor field-effect transistor 12 electrically connected to the power supply 16. The drain of the second metal-oxide-semiconductor field-effect transistor 12 is electrically connected to the gate of a first metal-oxide-semiconductor field-effect transistor 11, the gate of the second metal-oxide-semiconductor field-effect transistor 12 is electrically connected to the positive terminal of the power supply 16 to be discharged, and the source of the second metal-oxide-semiconductor field-effect transistor 12 is grounded. The drain of the first metal-oxide-semiconductor field-effect transistor 11 is electrically connected to the positive terminal of the power supply 16 to be discharged, and the source of the first metal-oxide-semiconductor field-effect transistor 11 is electrically connected to the negative terminal of the power supply 16 to be discharged.

[0050] Metal-oxide-semiconductor field-effect transistors (MOSFETs) are semiconductor devices that control the output current by utilizing the electric field effect of the input circuit. MOSFETs are voltage-controlled semiconductor devices with advantages such as high input resistance, low noise, low power consumption, wide dynamic range, ease of integration, no secondary breakdown, and a wide safe operating area. MOSFETs can be classified according to their channel and material into N-channel enhancement-mode MOSFETs, N-channel depletion-mode MOSFETs, P-channel enhancement-mode MOSFETs, and P-channel depletion-mode MOSFETs.

[0051] In the embodiments of this application, such as Figure 1 and Figure 2 As shown, the first metal-oxide-semiconductor field-effect transistor 11 and the second metal-oxide-semiconductor field-effect transistor 12 are both N-channel enhancement-mode metal-oxide-semiconductor field-effect transistors, so that the first metal-oxide-semiconductor field-effect transistor 11 can cut off or turn on the first circuit, and the second metal-oxide-semiconductor field-effect transistor 12 can cut off or turn on the second circuit.

[0052] Specifically, an N-channel enhancement-mode metal-oxide-semiconductor field-effect transistor (MOSFET) includes a P-type semiconductor substrate. Two highly doped N-type semiconductors are fabricated on a lightly doped P-type substrate using diffusion technology, with leads extending from each semiconductor as the source (S) and drain (D) terminals. The P-type substrate is internally connected to the source in the N-channel MOSFET. An insulating layer is placed between the P-type substrate and the two N-type semiconductors, and a gate (G) is formed by leads extending from polysilicon. Because the gate has an insulating oxide layer, its input impedance is high, resulting in almost no current being drawn from it. This allows it to function as an electronic switch, and the gate is not connected to either the source or drain, thus isolating the gate from both the source and drain terminals of the N-channel MOSFET.

[0053] N-type semiconductors, also known as electron-type semiconductors, are impurity semiconductors where the concentration of free electrons is much greater than the concentration of holes. P-type semiconductors, also known as hole-type semiconductors, are semiconductors where positively charged holes are the primary conductors. In P-type semiconductors, holes are the majority carriers, and free electrons are the minority carriers, with holes being the main conductor. The more impurities added, the higher the concentration of majority carriers. When a voltage is applied to the gate of an N-channel enhancement-mode metal-oxide-semiconductor field-effect transistor, an electric field is generated on the insulating layer. This field repels majority carrier holes in the P-substrate and attracts minority carrier electrons, drawing electrons to the edge of the insulating layer. Since N-type semiconductors are predominantly electron-type, this attraction causes electrons to accumulate, forming an inversion layer. The portion of the P-type semiconductor near the insulating layer "becomes N-type" because the presence of electrons under the influence of the electric field creates a current, allowing the source and drain to conduct. When the voltage between the gate and the source (Vgs) exceeds the threshold voltage (Vth) and the voltage difference between the drain and the source (Vds) is positive, the metal-oxide-semiconductor field-effect transistor will enter the conducting state. At this time, the drain and the source are equivalent to a closed switch, and the current can flow from the drain to the source.

[0054] When the power supply 16 is connected to the battery discharge processing device 1, since the positive terminal of the power supply 16 is electrically connected to the gate of the second metal-oxide-semiconductor field-effect transistor 12, a voltage is applied to the gate so that the voltage (Vgs) of the gate of the second metal-oxide-semiconductor field-effect transistor 12 relative to its source exceeds its threshold voltage (Vth). This causes the drain and source of the second metal-oxide-semiconductor field-effect transistor 12 to conduct, i.e., the second metal-oxide-semiconductor field-effect transistor 12 is turned on. At the same time, the drain of the second metal-oxide-semiconductor field-effect transistor 12 is electrically connected to the gate of the first metal-oxide-semiconductor field-effect transistor 11. At this time, the drain of the second metal-oxide-semiconductor field-effect transistor 12 can apply a voltage to the gate of the first metal-oxide-semiconductor field-effect transistor 11, thereby causing the drain and source of the first metal-oxide-semiconductor field-effect transistor 11 to conduct, i.e., the first metal-oxide-semiconductor field-effect transistor 11 is turned on. This, in turn, makes the first circuit conduct, so that the power supply 16 can discharge through the load resistor 13, which is beneficial to improving the discharge efficiency of the power supply 16.

[0055] The threshold voltage (Vth) of the second metal-oxide-semiconductor field-effect transistor 12 can be the lower discharge limit voltage of the power supply 16 to be discharged. As the discharge time increases, the voltage of the power supply 16 to be discharged will gradually decrease. When the voltage applied by the power supply 16 to the gate of the second metal-oxide-semiconductor field-effect transistor 12 is less than the threshold voltage (Vth) of the second metal-oxide-semiconductor field-effect transistor 12, the source and drain of the second metal-oxide-semiconductor field-effect transistor 12 are cut off, that is, they cannot conduct, so that the second circuit cannot conduct. Thus, the drain of the second metal-oxide-semiconductor field-effect transistor 12 cannot apply voltage to the gate of the first metal-oxide-semiconductor field-effect transistor 11, so that the drain and source of the first metal-oxide-semiconductor field-effect transistor 11 are cut off, so that the first circuit cannot conduct. This can prevent the power supply 16 to continue discharging, thereby reducing the risk of over-discharge, reducing the risk of corrosion of the negative current collector of the power supply 16 and the risk of expansion of the power supply 16, reducing the difficulty of subsequent disassembly of the power supply 16, and thus reducing the difficulty of material disassembly and recycling, making it easier for the power supply 16 to be recycled and processed.

[0056] Therefore, when the voltage of the power supply 16 to be discharged is greater than the threshold voltage (Vth) of the second metal-oxide-semiconductor field-effect transistor 12, the second metal-oxide-semiconductor field-effect transistor 12 is turned on, and thus the second metal-oxide-semiconductor field-effect transistor 12 can be used to control the first metal-oxide-semiconductor field-effect transistor 11 to be turned on; when the voltage of the power supply 16 to be discharged is less than the threshold voltage (Vth) of the second metal-oxide-semiconductor field-effect transistor 12, the second metal-oxide-semiconductor field-effect transistor 12 cannot be turned on, and thus the second metal-oxide-semiconductor field-effect transistor 12 can control the first metal-oxide-semiconductor field-effect transistor 11 to be turned off, so that the first circuit can be automatically disconnected when the discharge voltage of the power supply 16 to be discharged is low, avoiding the risk of over-discharge caused by personnel not removing the power supply 16 to be discharged from the battery discharge processing device 1 in time, that is, reducing the risk of the discharge voltage of the power supply 16 to be discharged being less than the lower discharge limit voltage, thereby reducing the risk of corrosion of the negative current collector of the power supply 16 to be discharged and the risk of expansion of the power supply 16 to be discharged, facilitating subsequent disassembly and improving the safety of use. Therefore, the second metal-oxide-semiconductor field-effect transistor 12 can control the conduction and cutoff of the first metal-oxide-semiconductor field-effect transistor 11, thereby controlling the automatic conduction or cutoff of the first circuit without manual operation, improving the convenience of the battery discharge processing device 1 for discharging the power supply 16.

[0057] In one possible implementation, such as Figures 1-4 As shown, the battery discharge processing device 1 also includes a thermal protector 15, which is used to disconnect the first circuit when the temperature of the first circuit reaches a preset temperature, and to connect the first circuit when the temperature of the first circuit is lower than the preset temperature. Simultaneously, the thermal protector 15 can also disconnect the first circuit when the circuit current in the battery discharge processing device 1 is too high.

[0058] In this embodiment, as the discharge time increases, when the current in the first circuit becomes too large, the temperature of the first circuit often exceeds the preset temperature. At this time, the thermal protector 15 disconnects, thus disconnecting the first circuit. That is, the thermal protector 15 can provide overcurrent protection for the first metal-oxide-semiconductor field-effect transistor 11, reducing the risk of damage to the first metal-oxide-semiconductor field-effect transistor 11 due to excessive current, and avoiding the risk of the load resistor 13 becoming too hot. This reduces the safety hazards that may occur during discharge and improves the reliability and safety of discharge.

[0059] Specifically, such as Figure 1 and Figure 2As shown, the thermal protector 15 is located between the power supply 16 to be discharged and the first metal-oxide-semiconductor field-effect transistor 11, and also between the power supply 16 to be discharged and the second metal-oxide-semiconductor field-effect transistor 12, i.e., the thermal protector 15 is connected in series in the first circuit and the second circuit. In this embodiment, when the temperature of the first circuit and / or the second circuit reaches a preset temperature, the thermal protector 15 can automatically disconnect to directly cut off the first circuit and the second circuit, so that the power supply 16 to be discharged cannot discharge through the first metal-oxide-semiconductor field-effect transistor 11 and the load resistor 13, thereby improving the safety of the battery discharge processing device 1. When the temperature of the first circuit recovers to below the preset temperature, the thermal protector 15 can automatically close to connect the first circuit and the second circuit, so that the power supply 16 to be discharged can continue to discharge through the first circuit.

[0060] like Figure 3 and Figure 4 As shown, the thermal protector 15 is located between the power supply 16 to be discharged and the second metal-oxide-semiconductor field-effect transistor 12, and is connected in series only in the second circuit. In this embodiment, when the temperature of the first circuit and / or the second circuit reaches a preset temperature, the thermal protector 15 can automatically disconnect to directly cut off the second circuit. This causes the second metal-oxide-semiconductor field-effect transistor 12 to turn off, thereby controlling the first metal-oxide-semiconductor field-effect transistor 11 to turn off, indirectly breaking the first circuit. This prevents the power supply 16 from discharging through the first metal-oxide-semiconductor field-effect transistor 11 and the load resistor 13, improving the safety of the battery discharge processing device 1. When the temperature of the first circuit returns to below the preset temperature, the thermal protector 15 can automatically close to connect the second circuit. This allows the second metal-oxide-semiconductor field-effect transistor 12 to control the first metal-oxide-semiconductor field-effect transistor 11 to conduct, enabling the power supply 16 to continue discharging through the first circuit.

[0061] Therefore, by providing a thermal protector 15 in the battery discharge treatment device 1, the battery discharge treatment device 1 can have overcurrent protection, overtemperature protection and temperature regulation capabilities, reducing the risk of damage to electrical components in the device due to overheating, thereby greatly improving the safety and convenience of using the battery discharge treatment device 1.

[0062] In addition, when the voltage of the power supply 16 to be discharged is mismatched with the load resistor 13, it is easy to cause excessive current and excessive temperature of the load resistor 13. By setting a thermal protector 15 in the battery discharge processing device 1, the first circuit and the second circuit can be cut off in time, reducing the risk of burns to operators or fire hazards.

[0063] In one possible implementation, such as Figures 1-4 As shown, thermal protector 15 is a positive temperature coefficient thermistor; and / or, thermal protector 15 is attached to the surface of load resistor 13.

[0064] In this embodiment, the thermal protector 15 can be a positive temperature coefficient thermistor (PTC), whose resistance increases as the temperature rises, and can be used to limit current. Simultaneously, the PTC can be configured with a hot-start temperature (i.e., the aforementioned preset temperature, at which point the thermal protector 15 is disconnected) and a low-temperature recovery temperature (at which point the thermal protector 15 is closed) according to actual needs. Furthermore, the thermal protector 15 can be attached to the surface of the load resistor 13 to ensure a tight fit, allowing for accurate temperature measurement. When the temperature of the load resistor 13 exceeds the preset temperature (i.e., the hot-start temperature), the thermal protector 15 can quickly respond and disconnect the first circuit. In one possible implementation, such as... Figure 1 and Figure 2 As shown, the battery discharge processing device 1 also includes an indicator component 14, which is connected in parallel with the first circuit and is used to indicate whether the discharge is complete.

[0065] When the power supply 16 begins to discharge, the indicator component 14 can prompt the personnel that the power supply 16 is in a discharging state, indicating that the battery discharge processing device 1 is working normally. When the power supply 16 finishes discharging, the indicator component 14 can prompt the personnel that the power supply 16 has finished discharging, prompting the personnel to remove the power supply 16 in a timely manner and replace it with another power supply 16 that needs to be discharged, thereby improving discharge efficiency and subsequent processing efficiency.

[0066] In one possible implementation, such as Figure 1 As shown, the indicating component 14 includes a light-emitting diode 141 and a first resistor 142 connected in series with the light-emitting diode 141. The indicating component 14 is used to be connected in parallel across the power supply 16 to form a third circuit. Wherein, as... Figure 1 and Figure 3 In the embodiment shown, the first resistor 142 is electrically connected to the positive terminal of the power supply 16 to be discharged, and the light-emitting diode 141 is electrically connected to the negative terminal of the power supply 16 to be discharged. That is, the first resistor 142, the light-emitting diode 141 and the power supply 16 to be discharged form a third circuit.

[0067] In this implementation, when the power supply 16 to be discharged is connected to the battery discharge processing device 1, the light-emitting diode 141 lights up; when the power supply 16 to be discharged is completed, the light-emitting diode 141 turns off to indicate to the personnel that the discharge is complete so that the personnel can replace the power supply 16 to be discharged in a timely manner.

[0068] In addition, the light-emitting diode 141 is connected in series with a first resistor 142 with a large resistance value. Since the light-emitting diode 141 is usually allowed to pass through a current in the milliampere range, the first resistor 142 in series can limit the current in the third circuit, reduce the risk of the light-emitting diode 141 overheating or even burning out, and help improve the reliability of the light-emitting diode 141 in the operation of the battery discharge treatment device 1, while also improving the safety of the battery discharge treatment device 1.

[0069] In one possible implementation, such as Figure 2 As shown, one end of the indicating component 14 is electrically connected to the positive terminal of the power supply 16 to be discharged, and the other end of the indicating component 14 is electrically connected to the load resistor 13. The indicating component 14 and the load resistor 13 are connected in series with the power supply 16 to form a third circuit. Figure 2 and Figure 4 In the illustrated embodiment, one end of the indicating component 14 is electrically connected to the positive terminal of the power supply 16 to be discharged, and the other end is connected between the load resistor 13 and the first metal-oxide-semiconductor field-effect transistor 11. The first resistor 142 is electrically connected to the positive terminal of the power supply 16 to be discharged. The first resistor 142, the light-emitting diode 141 and the load resistor 13 are connected in series, and the load resistor 13 is electrically connected to the negative terminal of the power supply 16 to be discharged. That is, the first resistor 142, the light-emitting diode 141, the load resistor 13 and the power supply 16 to be discharged form a third circuit.

[0070] In one possible implementation, such as Figures 1-4 As shown, in one possible implementation, such as Figures 1-4 As shown, the indicating component 14 is connected in parallel with the thermal protector 15, or the indicating component 14 is connected in parallel with the first circuit containing the thermal protector 15 and the power supply 16 to be discharged. Specifically, as Figure 1 As shown, thermal protector 15 is connected in series in both the first and second circuits, and indicator assembly 14 is connected in parallel with the first circuit containing thermal protector 15; as Figure 2 As shown, the thermal protector 15 is connected in series in the first and second circuits, and the indicator assembly 14 is connected in parallel with the first circuit containing the thermal protector 15 and the power supply 16 to be discharged; as Figure 3 and Figure 4 As shown, the indicator component 14 is connected in parallel with the first circuit containing the thermal protector 15 and the power supply 16 to be discharged. That is, as... Figures 1-4As shown, the indicator component 14 is used to connect between the positive terminal of the power supply 16 to be discharged and the thermal protector 15. Even if the thermal protector 15 cannot be connected in series in the third circuit, so that the thermal protector 15 cannot be connected in series in the first circuit, the second circuit and the third circuit at the same time, the risk of the third circuit being disconnected when the thermal protector 15 is disconnected is avoided, and the risk of the light-emitting diode 141 being extinguished due to the excessive temperature of the battery discharge processing device 1 is reduced, thereby reducing the risk that the indicator component 14 cannot indicate that the power supply 16 to be discharged has completed the discharge.

[0071] It should be noted that after the thermal protector 15 trips, disconnecting the first and second circuits, the third circuit remains conductive. Since the third circuit is allowed to carry a current in the milliampere range, there is still no risk of over-discharge in the power supply 16. In summary, the battery discharge processing device 1 provided in this application has a simple structure, low cost, and the discharge process is environmentally friendly with low safety risks.

[0072] In one possible implementation, such as Figures 1-4 As shown, the power source to be discharged 16 is a single battery cell, a battery module, a battery pack, or an energy storage system. That is, the battery discharge processing device 1 can discharge the single battery cell, the battery module, the battery pack, or the energy storage system to meet various discharge requirements.

[0073] When the power supply 16 is a single battery cell, the thermal protector 15 has an overcurrent capability of 17A and a preset temperature (i.e., hot start temperature) of 80℃; the load resistor 13 is a ripple resistor with a rated power of 3KW and an internal resistance of 0.2Ω; the first metal-oxide-semiconductor field-effect transistor 11 has a threshold voltage of 1.2V and an overcurrent capability of 18A~27.5A; the second metal-oxide-semiconductor field-effect transistor 12 has a threshold voltage of 1.5V; the light-emitting diode 141 is a yellow LED; and the first resistor 142 has a resistance of 220Ω. The thermal protector 15 is attached to the surface of the load resistor 13.

[0074] When the power supply 16 is a battery pack or system, the thermal protector 15 has an overcurrent capability of 17A and a preset temperature (i.e., hot start temperature) of 80℃; the load resistor 13 is a ripple resistor with a rated power of 5KW and an internal resistance of 20Ω; the first metal-oxide-semiconductor field-effect transistor 11 and the second metal-oxide-semiconductor field-effect transistor 12 have the same specifications, both with a threshold voltage of 180V and an overcurrent capability of 18A to 27.5A; the light-emitting diode 141 is a blue LED, and the first resistor 142 has a resistance of 25kΩ. The thermal protector 15 is attached to the surface of the load resistor 13.

[0075] This application embodiment also provides a discharge method, which uses the battery discharge processing device 1 in any of the above embodiments;

[0076] In one specific embodiment, the discharge method includes:

[0077] S1: Connect the power supply 16 to be discharged to the battery discharge processing device 1.

[0078] S2: The power supply to be discharged 16 controls the second metal-oxide-semiconductor field-effect transistor 12 to turn on, and then the second metal-oxide-semiconductor field-effect transistor 12 controls the first metal-oxide-semiconductor field-effect transistor 11 to turn on, so that the first circuit is turned on, and the power supply to be discharged 16 discharges through the load resistor 13 on the first circuit.

[0079] S3: When the discharge voltage of the power supply to be discharged 16 is lower than the threshold voltage of the second metal-oxide-semiconductor field-effect transistor 12, the second metal-oxide-semiconductor field-effect transistor 12 is turned off, and the second metal-oxide-semiconductor field-effect transistor 12 controls the first metal-oxide-semiconductor field-effect transistor 11 to be turned off, so as to disconnect the first circuit.

[0080] In this embodiment, by using the above step S3, when the second metal-oxide-semiconductor field-effect transistor 12 is turned off, the first metal-oxide-semiconductor field-effect transistor 11 is turned off, so that the first circuit cannot be turned on, thereby avoiding the risk of over-discharge caused by the power supply 16 continuing to discharge through the first circuit, thus reducing the difficulty of subsequent disassembly of the power supply 16 and facilitating the subsequent recycling and processing of the power supply 16.

[0081] Specifically, the threshold voltage of the first metal-oxide-semiconductor field-effect transistor (MOSFET) 11 should be less than or equal to the threshold voltage of the second MOSFET 12, since the second MOSFET 12 acts as a signal control source to control the conduction and cutoff of the first MOSFET 11. If the threshold voltage of the first MOSFET 11 is greater than the threshold voltage of the second MOSFET 12, the voltage applied from the drain of the second MOSFET 12 to the gate of the first MOSFET 11 will be smaller, resulting in the first MOSFET 11 never being able to conduct. Therefore, having the threshold voltage of the first MOSFET 11 less than or equal to the threshold voltage of the second MOSFET 12 improves the feasibility and reliability of the first MOSFET 11 conducting, thereby improving the feasibility and reliability of the first circuit conducting.

[0082] In one possible implementation, such as Figures 1-4 As shown, the battery discharge processing device 1 also includes a thermal protector 15.

[0083] In one specific embodiment, step S2 may further include steps S21 and S22:

[0084] S21: During the discharge process of the power supply 16 to be discharged through the load resistor 13 in the first circuit, if the temperature of the first circuit is greater than the preset temperature, the thermal protector 15 will disconnect to make the first circuit open.

[0085] S22: When the temperature of the first circuit recovers to a temperature lower than the preset temperature, and when the discharge voltage of the power supply to be discharged 16 is greater than the threshold voltage of the second metal oxide semiconductor field-effect transistor 12, the thermal protector 15 closes to make the first circuit conduct.

[0086] In this embodiment, through step S21, when the temperature of the first circuit is too high, the thermal protector 15 automatically disconnects, allowing both the first and second circuits to be disconnected, i.e., no current flows, reducing the risk of damage to the second metal-oxide-semiconductor field-effect transistor 12 and the first metal-oxide-semiconductor field-effect transistor 11, and improving the reliability and safety of the battery discharge processing device 1. Through step S22, when the temperature of the first circuit returns to below the preset temperature, the thermal protector 15 automatically closes, allowing both the first and second circuits to be connected, i.e., current flows, so that the power supply 16 to be discharged can continue to discharge through the first circuit, improving the discharge efficiency.

[0087] In one possible implementation, such as Figures 1-4 As shown, the battery discharge processing device 1 also includes an indicator component 14.

[0088] In one specific embodiment, step S1 may further include step S11, and step S3 may be followed by step S4:

[0089] S11: When the power supply to be discharged 16 starts to discharge, the light-emitting diode 141 of the indicator component 14 lights up.

[0090] S4: When the power supply to be discharged 16 has finished discharging, the light-emitting diode 141 of the indicator component 14 turns off.

[0091] In this embodiment, after the power supply 16 to be discharged is electrically connected to the battery discharge processing device 1, that is, when the power supply 16 to be discharged starts to discharge, the light-emitting diode 141 of the indicator component 14 lights up, that is, after performing step S1, step S11 is performed to prompt the personnel that the power supply 16 to be discharged has started to discharge.

[0092] After steps S2 and S3, step S4 is performed. At this time, the light-emitting diode 141 of the indicator component 14 is turned off to indicate to the personnel that the power supply 16 to be discharged has been discharged, so that the personnel can replace the power supply 16 to be discharged in time to improve the discharge efficiency.

[0093] In summary, as Figures 1-4 The discharge method in the illustrated embodiment is as follows: Step S1 is performed, and simultaneously, the thermal protector 15 is closed, and steps S11 and S2 are performed, meaning that the first circuit, the second circuit, and the third circuit are all conducting at this time. Subsequently, if the temperature of the battery discharge processing device 1 is high, steps S21 and S22 are performed. If the temperature of the battery discharge processing device 1 never exceeds the preset temperature, steps S21 and S22 are not performed. Then, step S3 is performed, and finally step S4 is performed to complete the discharge.

[0094] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery discharge treatment device, characterized in that, The battery discharge treatment device (1) for discharging waste lithium batteries includes a first circuit and a second circuit for controlling the first circuit to be turned on or off. The first circuit includes a load resistor (13) connected in series and a first metal oxide semiconductor field-effect transistor (11). The first metal oxide semiconductor field-effect transistor (11) and the load resistor (13) are used to be electrically connected to the power supply (16) to be discharged. The first metal oxide semiconductor field-effect transistor (11) is used to connect or disconnect the first circuit. The second circuit includes the power supply to be discharged (16) and a second metal-oxide-semiconductor field-effect transistor (12) electrically connected to the power supply to be discharged (16). Wherein, the first metal-oxide-semiconductor field-effect transistor (11) and the second metal-oxide-semiconductor field-effect transistor (12) are both N-channel enhancement-mode metal-oxide-semiconductor field-effect transistors, the drain of the second metal-oxide-semiconductor field-effect transistor (12) is used to be electrically connected to the gate of the first metal-oxide-semiconductor field-effect transistor (11), the gate of the second metal-oxide-semiconductor field-effect transistor (12) is used to be electrically connected to the positive terminal of the power supply to be discharged (16), and the source of the second metal-oxide-semiconductor field-effect transistor (12) is grounded; The drain of the first metal-oxide-semiconductor field-effect transistor (11) is electrically connected to the positive terminal of the power supply to be discharged (16), and the source of the first metal-oxide-semiconductor field-effect transistor (11) is electrically connected to the negative terminal of the power supply to be discharged (16). The threshold voltage of the second metal-oxide-semiconductor field-effect transistor (12) is the lower discharge limit voltage of the power supply to be discharged (16); The threshold voltage of the first metal-oxide-semiconductor field-effect transistor (11) is less than or equal to the threshold voltage of the second metal-oxide-semiconductor field-effect transistor (12).

2. The battery discharge treatment apparatus according to claim 1, characterized in that, The battery discharge processing device (1) further includes a thermal protector (15), which is used to cut off the first circuit when the temperature of the first circuit reaches a preset temperature, and to connect the first circuit when the temperature of the first circuit is lower than the preset temperature. The thermal protector (15) is a positive temperature coefficient thermistor; and / or, The thermal protector (15) is attached to the surface of the load resistor (13).

3. The battery discharge treatment apparatus according to claim 2, characterized in that, The battery discharge processing device (1) further includes an indicator component (14), which is connected in parallel with the first circuit and is used to indicate whether the discharge is complete; The indicating component (14) is connected in parallel with the thermal protector (15), or the indicating component (14) is connected in parallel with the first circuit between the thermal protector (15) and the power supply to be discharged (16).

4. The battery discharge treatment apparatus according to claim 3, characterized in that, The indicator component (14) includes a light-emitting diode (141) and a first resistor (142) connected in series with the light-emitting diode (141). The indicator component (14) is used to be connected in parallel across the two ends of the power supply to be discharged (16) to form a third circuit.

5. The battery discharge treatment apparatus according to claim 3, characterized in that, One end of the indicator component (14) is electrically connected to the positive terminal of the power supply to be discharged (16), and the other end of the indicator component (14) is electrically connected to the load resistor (13). The indicator component (14) and the load resistor (13) are connected in series with the power supply to be discharged (16) to form a third circuit.

6. The battery discharge treatment apparatus according to any one of claims 1-5, characterized in that, The power source to be discharged (16) is a single battery cell, a battery module, a battery pack, or an energy storage system.

7. A discharge method, characterized in that, The discharge method employs the battery discharge processing device (1) as described in any one of claims 1-6. The power supply to be discharged (16) is electrically connected to the battery discharge processing device (1); The second metal-oxide-semiconductor field-effect transistor (12) is turned on, making the first circuit open, and the power supply to be discharged (16) is discharged through the load resistor (13) on the first circuit; When the discharge voltage of the power supply to be discharged (16) is lower than the threshold voltage of the second metal oxide semiconductor field-effect transistor (12), the first circuit is disconnected.

8. The discharge method according to claim 7, characterized in that, The battery discharge processing device (1) includes a thermal protector (15). During the discharge process of the power supply to be discharged (16) through the load resistor (13) on the first circuit, when the temperature of the first circuit is greater than the preset temperature, the thermal protector (15) disconnects to make the first circuit open. When the temperature of the first circuit is lower than the preset temperature, and when the discharge voltage of the power supply to be discharged (16) is greater than the threshold voltage of the second metal oxide semiconductor field-effect transistor (12), the thermal protector (15) closes to make the first circuit conduct.

9. The discharge method according to claim 7, characterized in that, The battery discharge processing device (1) further includes an indicator component (14). When the power supply to be discharged (16) starts to discharge, the indicator component (14) lights up, and when the power supply to be discharged (16) finishes discharging, the indicator component (14) turns off.

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