Power supply detection device and power supply cabinet
By incorporating an adjustable control unit and a parallel power supply into the power detection device, the problem of inconsistent current under conditions of high internal resistance or small potential difference is solved, thus achieving constant current output.
Patent Information
- Application Number
- CN202423022755.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-09
AI Technical Summary
Conventional power cabinets cannot achieve constant current discharge control when faced with high internal resistance batteries or batteries with small potential differences between their positive and negative terminals.
A second control circuit is formed by setting an adjustable first control unit and a selectively parallel first power supply in the power detection device. The power supply is connected and disconnected by a switch, and the resistance value is adjusted to keep the current constant.
Under conditions of high internal resistance or small potential difference, a constant output of current at the positive terminal interface of the power supply is achieved, ensuring that the current value always remains at the preset value.
Smart Images
Figure CN223664748U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power supply detection technology, and more specifically, to a power supply detection device and a power supply cabinet. Background Technology
[0002] In the battery industry, many operating conditions require constant current charging and discharging processes, such as battery capacity monitoring, lifespan testing, coulombic efficiency detection, formation, and capacity grading. Therefore, maintaining a constant circuit current is crucial for achieving these functions. In conventional battery circuit systems, when dealing with high internal resistance batteries or batteries with small potential differences between their positive and negative electrodes, the current-constant control circuits in conventional power supply cabinets have limited adjustment capabilities and cannot achieve a consistently constant current. Utility Model Content
[0003] This application provides a power detection device and a power cabinet.
[0004] This application provides a power supply detection device, including an input port and an output port, the input port and the output port being adapted to connect to a power supply under test; a first control unit, connected to the input port and the output port to form a first control circuit; the resistance value of the first control unit is adjustable; a first power supply, the first power supply being selectively connected in parallel with the first control unit to form a second control circuit; when the first power supply and the first control unit are connected in parallel, they are adapted to provide additional current to the constant current power supply detection device.
[0005] In some embodiments, the second control circuit further includes a switch connected in series with the first power supply; the switch is adapted to control the second control circuit to be turned on or off.
[0006] In some implementations, the switch is a relay, a transistor, or a diode.
[0007] In some embodiments, the second control circuit further includes a second control unit, which is connected in series with the first power supply, and the resistance value of the second control unit is adjustable.
[0008] In some embodiments, the second control unit includes a resistor, and / or a diode, and / or a transistor.
[0009] In some implementations, the first control unit includes a resistor, and / or a diode, and / or a transistor.
[0010] In some embodiments, a first acquisition unit is further included, which is connected to the input port and the output port, and is adapted to acquire the voltage of the input port and the output port.
[0011] In some embodiments, a second acquisition unit is further included, one end of which is connected to the first control circuit and the second control circuit, and the other end of which is connected to the input port; the second acquisition unit is adapted to acquire the current of the power detection device.
[0012] In some embodiments, the power supply detection device further includes a controller; the controller is adapted to control the resistance value of the first control unit; and / or control the first power supply to be selectively connected in parallel with the first control unit; and / or control the additional current value provided by the second control circuit to the constant current power supply detection device.
[0013] This application also provides a power cabinet, which includes a power detection device provided in this application.
[0014] The power detection device provided in this application, by setting a first power supply that can be selectively connected in parallel with the first control unit, enables the first power supply to selectively connect to the power detection device when the test power supply is in a high internal resistance state or when the positive and negative potential difference of the test power supply itself is small, thereby providing an appropriate auxiliary current to the power detection device, and thus maintaining a preset current value when the test power supply is discharging.
[0015] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description
[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:
[0017] Figure 1 This is a schematic diagram of a power detection device according to certain embodiments of this application;
[0018] Figure 2 This is a signal schematic diagram of a power detection device according to certain embodiments of this application.
[0019] Explanation of key component symbols:
[0020] 1-Power supply; 14-Positive power supply interface; 15-Negative power supply interface; 2-Power supply detection device; 21-Switch; 22-First power supply; 23-Input port; 24-Output port; R1-First internal resistance; R2-First control unit; R3-Second control unit; R4-Second internal resistance; 100-First control circuit; 200-Second control circuit; 3-Second acquisition unit; 4-First acquisition unit; 51-Current sampling circuit; 55-Voltage control circuit. Detailed Implementation
[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.
[0022] In the battery industry, constant current charging and discharging processes are required under many operating conditions, such as battery capacity monitoring, life testing, coulombic efficiency testing, formation, and capacity grading. In conventional battery circuitry, to achieve constant current discharge, a control unit with continuously adjustable resistance is typically composed of a hybrid of resistors, diodes, and transistors. Adjusting the resistance of this control unit maintains a constant current value. However, during discharge, the internal resistance of the power supply may increase periodically, and when the power supply's energy is low, the potential difference between its positive and negative terminals will be small. In this situation, conventional battery circuitry cannot achieve constant current discharge; that is, the current value at the power supply's input port cannot remain constant, or cannot maintain the desired current value.
[0023] To address the aforementioned issues, this patent proposes a power detection device 2. The power detection device 2 includes an input port 23 and an output port 24. The input port 23 is adapted to connect to the positive power interface 14 of a power supply 1, and the output port 24 is adapted to connect to the negative power interface 15 of the power supply 1. The power supply 1 provides a voltage U0 to ensure that a voltage U0 exists between the input port 23 and the output port 24. The power detection device 2 also includes a first control unit R2, which is connected to the input port 23 and the output port 24 to form a first control circuit 100. The resistance value of the first control unit R2 is adjustable. Based on the formula I = U / R = U0 / (R1 + R2), since the first internal resistance R1 of power supply 1 changes in real time during discharge, or after a period of discharge, the voltage U0 between the positive terminal 14 and the negative terminal 15 of power supply 1 is relatively small, the resistance value of the first control unit R2 is adjusted to keep the current I at the positive terminal 14 constant. For example, when the resistance value of the first internal resistance R1 is too large, the resistance value of the first control unit R2 is reduced to keep the current at the positive terminal 14 constant. When the value of R1 is too large, the current I cannot remain constant. That is, when the first internal resistance R1 of power supply 1 is too large, even when the resistance value of the first control unit R2 is adjusted to 0Ω, the current I at the positive terminal 14 still cannot maintain a constant current output, which means that the minimum adjustment range of the resistance value of the power detection device 2 is exceeded. The power supply detection device 2 proposed in this patent also includes a first power supply 22. The first power supply 22 can be selectively connected in parallel with the first control unit R2 to form a second control circuit 200. That is, when the resistance value of the power supply detection device 2 is not exceeded, the first power supply 22 can be selectively not connected to the power supply detection device 2. However, when the resistance value of the power supply detection device 2 is exceeded, the first power supply 22 will be connected to the power supply detection device 2. At this time, the first power supply 22 is suitable for providing additional current to the constant current power supply detection device 2. The first power supply 22 and the first control unit R2 are connected in parallel, and the first power supply 22 provides an additional voltage U1 so that the second control circuit 200 has additional current, thereby increasing the current at the positive terminal interface 14 of the power supply.
[0024] I = I0 + I1 = U0 / (R1 + R2) + U1 / R4. Even if the first internal resistance R1 of power supply 1 is too large, the current can still be kept constant by adjusting the size of the first control unit R2 and / or adjusting the voltage value U1 of the first power supply 22, thus keeping the current I at the positive terminal interface 14 of the power supply constant. It should be noted that the second internal resistance R4 represents the internal resistance of the first power supply 22.
[0025] It should be noted that, in some embodiments, the first control unit R2 may be a control unit composed of a mixture of resistors, and / or diodes, and / or transistors, which can realize continuously adjustable resistance values. The minimum resistance value of the first control unit R2 can be adjusted to 0Ω.
[0026] In some embodiments, the first power supply 22 is a combination device composed of some components and power supply that can control whether it is connected to the circuit and can control its voltage or resistance value. For example, some integrated modules include batteries and relays or transistors. In this case, the integrated module is the first power supply 22. By controlling the relays or other transistors in the first unit 22, it is possible to control whether the first power supply 22 is connected to the power detection device 2, and also to control how much additional current the first power supply 22 provides to the power detection device 2 after it is connected to the power detection device 2.
[0027] In some embodiments, the second control circuit 200 further includes a switch 21 connected in series with the first power supply 22. The switch 21 can control the opening and closing of the second control circuit 200, thereby controlling whether the first power supply 22 is connected to the power detection device 2.
[0028] In some embodiments, the second control circuit 200 further includes a second control unit R3, which is connected in series with the first power supply 22. Based on I1 = U1 / (R3 + R4), the second control unit R3 can adjust the magnitude of the current I1 of the second control circuit.
[0029] In some embodiments, the second control circuit 200 includes a switch 21 and a second control unit R3, which are connected in series with the first power supply 22. The first power supply 22 can be a battery. The switch 21 controls the opening and closing of the second control circuit 200. When the switch 21 is closed, the first power supply 22 is connected to the power detection device, providing a voltage U1 to the device. When the resistance R1 of the power supply 1 is too high or the voltage U0 provided by the power supply 1 is too low, the switch 21 closes, and the first power supply 22 is connected to the power detection device 2, providing a voltage U1. In this case, the second control circuit 200 provides an additional current I1 to the power detection device, thereby keeping the current I at the positive terminal interface 14 constant. Of course, when the first internal resistance R1 does not exceed the minimum adjustment range of the power detection device's resistance, adjusting the resistance of the first control unit R2 will also keep the current I at the positive terminal interface 14 constant. In this case, opening the switch 21 disconnects the second control circuit 200, and the first power supply 22 is not connected to the power detection device 2.
[0030] Furthermore, the resistance of the second control unit R3 is adjustable. Typically, the first power source 22 is a battery or battery pack, meaning the voltage U1 of the first power source 22 is determined by its electrochemical performance or specifications. For example, the voltage U1 provided by the first power source 22 is determined by its energy density or volume, meaning the voltage U1 of the first power source 22 cannot be adjusted by the system or manually. When the first power source 22 is connected to the power detection device 2, the current I may not remain constant due to an excessively high voltage U1. In this case, adjusting the resistance of the second control unit R3 can adjust the current I1 of the second control circuit 200, thereby maintaining a preset current value at the positive power interface 14.
[0031] In some embodiments, switch 21 can be a relay, a MOSFET, or a PLC controller. Of course, in some embodiments, switch 21 can also be a mechanical switch. Any device that can turn the second control circuit 200 on or off can be used as a switch in the embodiments of this application, and no specific limitation is made here.
[0032] In some embodiments, the second control unit R3 may be a control unit composed of a mixture of resistors, and / or diodes, and / or transistors, etc., which can realize continuously adjustable resistance values. The minimum resistance value of the second control unit R3 can be adjusted to 0Ω.
[0033] In some embodiments, see Figure 1 and Figure 2 The power detection device 2 also includes a first acquisition unit 4. The first acquisition unit 4 can be a voltage detector or other measuring element used to measure the voltage between the positive power interface 14 and the negative power interface 15. The first acquisition unit 4 is connected to the positive power interface 14 and the negative power interface 15 to form a voltage control circuit 55. The voltage control circuit 55 can measure or acquire the voltage value between the positive power interface 14 and the negative power interface 15. The voltage value between the positive power interface 14 and the negative power interface 15 can be measured through the voltage control circuit 55.
[0034] In some embodiments, see Figure 1 and Figure 2The power detection device 2 also includes a second acquisition unit 3. The second acquisition unit 3 can be a current detector or other measuring element used to measure the current I at the positive power interface 14. One end of the second acquisition unit 3 is connected to the first control circuit and the second control circuit, and the other end of the second acquisition unit 3 is connected to the input port 23, thereby forming a current sampling circuit 51. The current sampling circuit 51 can acquire the total current value of the power detection device 2. Since the input port 23 is electrically connected to the positive power interface 14, the current value I at the positive power interface 14 is the same as the total current value at the input port 23. The total current value refers to the sum of the current I0 of the first control circuit 100 and the current I1 of the second control circuit 200, i.e., I = I0 + I1.
[0035] In some embodiments, the positive power interface 14 and negative power interface 15 of the power supply 1 to be measured are connected to the input port 23 and output port 24 of the power detection device 2. If the first internal resistance R1 of the power supply 1 is too large during the discharge process and exceeds the minimum resistance adjustment range of the power detection device 2, the first power supply 22 can be connected to the power detection device 2 by closing the switch 21. By adjusting the resistance values of the first control unit R2 and the second control unit R3, the current I of the positive power interface 14 can always be kept at the preset value, thereby realizing constant current discharge of the power supply 1.
[0036] In some embodiments, the power detection device 2 further includes a controller that can control the opening or closing of switch 21, and can also control the first control unit R2 and / or the second control unit R3 to adjust their resistance values. It should be noted that switch 21 can be a relay, thus allowing the controller to control its opening or closing. In some complex power detection devices, the controller can be a control module or a control chip. By setting a desired current value in the controller and adjusting the resistance value of the first control unit R2, or controlling whether switch 21 is closed, and adjusting the resistance values of the first control unit R2 and the second control unit R3 after switch 21 is closed, the current I at the positive power interface 14 of the power supply 1 is kept constant.
[0037] This application also provides a power supply cabinet, which includes the power detection device provided in this application.
[0038] After the power cabinet or power detection device of this application is connected to the power supply 1 to be tested, the current value at the input port 23 can be controlled manually or automatically, that is, the current at the positive terminal interface of the power supply 1 to be tested can be kept constant.
[0039] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0040] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.
Claims
1. A power supply detection device, characterized in that, include: An input port and an output port, wherein the input port and the output port are adapted to connect to the power supply under test; A first control unit is connected to the input terminal and the output terminal to form a first control circuit; The resistance value of the first control unit is adjustable; A first power source, which may be selectively connected in parallel with the first control unit to form a second control circuit; the first power source is adapted to provide additional current when connected in parallel with the first control unit.
2. The power detection device according to claim 1, characterized in that, The second control circuit also includes a switch, which is connected in series with the first power supply; The switch is adapted to control the opening or closing of the second control circuit.
3. The power supply detection device according to claim 2, characterized in that, The switch is a relay, a transistor, or a diode.
4. The power supply detection device according to claim 1, characterized in that, The second control circuit also includes a second control unit, which is connected in series with the first power supply, and the resistance value of the second control unit is adjustable.
5. The power detection device according to claim 4, characterized in that, The second control unit includes resistors, and / or diodes, and / or transistors.
6. The power detection device according to claim 1, characterized in that, The first control unit includes a resistor, and / or a diode, and / or a transistor.
7. The power supply detection device according to claim 1, characterized in that, It also includes a first acquisition unit, which is connected to the input port and the output port, and is adapted to acquire the voltage of the input port and the output port.
8. The power supply detection device according to claim 1, characterized in that, It also includes a second acquisition unit, one end of which is connected to the first control circuit and the second control circuit, and the other end of which is connected to the input port; The second acquisition unit is adapted to acquire the current of the power supply detection device.
9. The power supply detection device according to any one of claims 1-8, characterized in that, The power detection device also includes a controller; The controller is adapted to control the resistance value of the first control unit; and / or The first power supply is selectively connected in parallel with the first control unit, and / or Control the first power supply to output a corresponding additional current.
10. A power supply cabinet, characterized in that, include: The power detection device according to any one of claims 1-9.