Sodium-ion battery charging and discharging control system and power supply device

Abstract

The utility model relates to a kind of control system and power supply equipment of sodium ion battery charge-discharge, belong to the technical field of power supply equipment.The system includes first control circuit, second control circuit, conversion circuit and multiple temperature sensors;Among them, the first end of the conversion circuit is electrically connected with the first end of the sodium ion battery pack of the system, the second end of the conversion circuit is electrically connected with the energy storage converter of the system, the third end of the conversion circuit is electrically connected with the input end of the second control circuit, the output end of the second control circuit is electrically connected with multiple temperature sensors, part of the device of the conversion circuit is multiplexed by the second control circuit and the energy storage converter;Among them, the first end of the first control circuit is communicatively connected with the fourth end of the conversion circuit.

Description

Technical Field

[0001] This utility model relates to the technical field of power supply equipment, and more specifically, to a control system and power supply equipment for charging and discharging sodium-ion batteries. Background Technology

[0002] With the rapid development of power supply equipment, new energy power supply equipment is gradually becoming the mainstream. Currently, sodium-ion batteries, as a relatively common new energy power source, can supplement the power of energy storage converters to suit more power consumption scenarios. Existing sodium-ion battery charging and discharging control systems typically use a control chip to control the conversion circuit to convert the DC power output from the sodium-ion battery into DC power that meets the requirements of the energy storage converter, and use a temperature sensor powered by the control chip to detect the ambient temperature before and after the sodium-ion battery operates. However, when sodium-ion batteries are supplying power simultaneously, a single temperature sensor cannot measure the ambient temperature before and after all sodium-ion batteries are operating. Utility Model Content

[0003] Embodiments of this disclosure provide a control system and power supply device for charging and discharging a sodium-ion battery.

[0004] According to a first aspect of the present invention, a control system for charging and discharging a sodium-ion battery is provided, the system comprising a first control circuit, a second control circuit, a conversion circuit, and multiple temperature sensors;

[0005] Wherein, the first terminal of the conversion circuit is electrically connected to the first terminal of the sodium-ion battery pack of the system, the second terminal of the conversion circuit is electrically connected to the energy storage converter of the system, the third terminal of the conversion circuit is electrically connected to the input terminal of the second control circuit, the output terminal of the second control circuit is electrically connected to multiple temperature sensors, and some components of the conversion circuit are multiplexed by the second control circuit and the energy storage converter;

[0006] The first terminal of the first control circuit is communicatively connected to the fourth terminal of the conversion circuit.

[0007] Optionally, the conversion circuit includes a primary-side conversion circuit, an isolation circuit, a secondary-side conversion circuit, and a detection and power supply circuit;

[0008] Wherein, the first terminal of the primary-side conversion circuit is electrically connected to the first terminal of the sodium-ion battery pack, the second terminal of the primary-side conversion circuit is electrically connected to the first terminal of the isolation circuit, the second terminal of the isolation circuit is electrically connected to the first terminal of the secondary-side conversion circuit, the second terminal of the secondary-side conversion circuit is electrically connected to the energy storage converter of the system, the input terminal of the detection power supply circuit is electrically connected to the second terminal of the secondary-side conversion circuit, and the output terminal of the detection power supply circuit is electrically connected to the first terminal of the control circuit;

[0009] The components of the conversion circuit include a primary-side conversion circuit, an isolation circuit, and a secondary-side conversion circuit.

[0010] Optionally, the primary-side conversion circuit includes a first switch, a second switch, a third switch, and a fourth switch;

[0011] Specifically, the connection point between the source of the first switching transistor and the drain of the second switching transistor is electrically connected to the negative terminal of the first end of the isolation circuit; the connection point between the source of the third switching transistor and the drain of the fourth switching transistor is electrically connected to the positive terminal of the first end of the isolation circuit; the connection point between the drain of the first switching transistor and the drain of the third switching transistor is electrically connected to the positive terminal of the first end of the sodium-ion battery pack; and the connection point between the source of the second switching transistor and the source of the fourth switching transistor is electrically connected to the negative terminal of the first end of the sodium-ion battery pack.

[0012] Optionally, the secondary-side switching circuit includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch;

[0013] Specifically, the connection point between the source of the fifth switch and the drain of the sixth switch is electrically connected to the positive terminal of the first end of the isolation circuit; the connection point between the source of the seventh switch and the drain of the eighth switch is electrically connected to the negative terminal of the first end of the isolation circuit; the connection point between the drain of the fifth switch and the drain of the seventh switch is electrically connected to the positive terminal of the first end of the energy storage converter; and the connection point between the source of the sixth switch and the source of the eighth switch is electrically connected to the negative terminal of the first end of the energy storage converter.

[0014] Optionally, the isolation circuit includes a first inductor, a second inductor, a sixth capacitor, a seventh capacitor, and a first transformer;

[0015] Wherein, the first end of the first inductor is electrically connected to the positive terminal of the second end of the primary-side conversion circuit, the second end of the first inductor is electrically connected to the first end of the primary-side coil of the first transformer, the first end of the sixth capacitor is electrically connected to the negative terminal of the second end of the primary-side conversion circuit, and the second end of the sixth capacitor is electrically connected to the second end of the primary-side coil of the first transformer.

[0016] Wherein, the first end of the second inductor is electrically connected to the positive terminal of the first terminal of the secondary-side conversion circuit, the second end of the second inductor is electrically connected to the first terminal of the secondary-side coil of the first transformer, the first end of the seventh capacitor is electrically connected to the negative terminal of the first terminal of the secondary-side conversion circuit, and the second end of the seventh capacitor is electrically connected to the second terminal of the secondary-side coil of the first transformer.

[0017] Optionally, the detection power supply circuit includes a second transformer, a first detection power supply circuit, and a second detection power supply circuit;

[0018] Wherein, the primary winding of the second transformer is electrically connected to the second terminal of the secondary conversion circuit, the first secondary winding of the second transformer is electrically connected to the first terminal of the first detection power supply circuit, the output terminal of the first detection power supply circuit is electrically connected to the first input terminal of the second control circuit, the second secondary winding of the second transformer is electrically connected to the first terminal of the second detection power supply circuit, and the output terminal of the second detection power supply circuit is electrically connected to the second input terminal of the second control circuit.

[0019] Optionally, the first detection power supply circuit includes a first step-down circuit, a first capacitor, and a second capacitor; the second detection power supply circuit includes a third capacitor, a fourth capacitor, and a fifth capacitor.

[0020] Wherein, the input terminal of the first step-down circuit is electrically connected to the first terminal of the first secondary coil of the second transformer, the output terminal of the first step-down circuit is electrically connected to the positive terminal of the first input terminal of the second control circuit, the first capacitor is connected between the input terminal and the ground terminal of the first step-down circuit, the second capacitor is connected between the output terminal and the ground terminal of the first step-down circuit, and the connection point between the ground terminal of the first step-down circuit and the second terminal of the first secondary coil is electrically connected to the negative terminal of the input terminal of the second control circuit.

[0021] The first end of the second secondary coil is electrically connected to the positive terminal of the second input terminal of the second control circuit, and the second end of the second secondary coil is electrically connected to the negative terminal of the second input terminal of the second control circuit. The third capacitor, the fourth capacitor, and the fifth capacitor are respectively connected across the positive and negative terminals of the second input terminal of the second control circuit.

[0022] Optionally, the detection power supply circuit further includes a first diode and a second diode;

[0023] The anode of the first diode is electrically connected to the first end of the first secondary coil of the second transformer, and the cathode of the first diode is electrically connected to the input terminal of the first step-down circuit; the anode of the second diode is electrically connected to the first end of the second secondary coil of the second transformer, and the cathode of the second diode is electrically connected to the positive terminal of the second input terminal of the second control circuit.

[0024] According to a second aspect of the present invention, a power supply device is provided, the device including a power supply unit, the power supply unit being a control system for charging and discharging a sodium-ion battery as described in the first aspect.

[0025] Optionally, the device further includes a sodium-ion battery pack electrically connected to a first terminal of the conversion circuit of the power supply device.

[0026] One technical advantage of this invention is that the sodium-ion battery charging and discharging control system provided by this invention can control the sodium-ion battery to supply power to the energy storage converter through the conversion circuit via the first control circuit. Furthermore, by configuring the first control circuit and the second control circuit, the sodium-ion battery can supply power to multiple temperature sensors through the conversion circuit. This allows for the simultaneous supply of power to multiple temperature sensors while reducing the manufacturing cost of the sodium-ion battery charging and discharging control system.

[0027] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0028] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the principles of the present invention.

[0029] Figure 1 This is a circuit diagram of a control system for charging and discharging a sodium-ion battery according to one embodiment. Detailed Implementation

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0032] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0033] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0035] See Figure 1 As shown, the control system for charging and discharging a sodium-ion battery according to an embodiment of this disclosure will be described.

[0036] The sodium-ion battery charging and discharging control system of this disclosure includes a first control circuit 1, a second control circuit 2, a conversion circuit, and multiple temperature sensors 3;

[0037] Wherein, the first terminal of the conversion circuit is electrically connected to the first terminal of the sodium-ion battery pack 4 of the system, the second terminal of the conversion circuit is electrically connected to the energy storage converter 5 of the system, the third terminal of the conversion circuit is electrically connected to the input terminal of the second control circuit 2, the output terminal of the second control circuit 2 is electrically connected to multiple temperature sensors 3, and some components of the conversion circuit are multiplexed by the second control circuit 2 and the energy storage converter 5.

[0038] The first terminal of the first control circuit 1 is communicatively connected to the fourth terminal of the conversion circuit.

[0039] In this embodiment, the sodium-ion battery charging and discharging control system can control the sodium-ion battery to supply power to the energy storage converter 5 through the conversion circuit via the first control circuit 1. Furthermore, by configuring the first control circuit 1 and the second control circuit 2, the sodium-ion battery can supply power to multiple temperature sensors 3 through the conversion circuit. This allows for simultaneous power supply to multiple temperature sensors 3 while reducing the manufacturing cost of the sodium-ion battery charging and discharging control system.

[0040] In some embodiments, the conversion circuit includes a primary-side conversion circuit, an isolation circuit, a secondary-side conversion circuit, and a detection power supply circuit;

[0041] Wherein, the first terminal of the primary-side conversion circuit is electrically connected to the first terminal of the sodium-ion battery pack 4, the second terminal of the primary-side conversion circuit is electrically connected to the first terminal of the isolation circuit, the second terminal of the isolation circuit is electrically connected to the first terminal of the secondary-side conversion circuit, the second terminal of the secondary-side conversion circuit is electrically connected to the energy storage converter 5 of the system, the input terminal of the detection power supply circuit is electrically connected to the second terminal of the secondary-side conversion circuit, and the output terminal of the detection power supply circuit is electrically connected to the first terminal of the control circuit;

[0042] The components of the conversion circuit include a primary-side conversion circuit, an isolation circuit, and a secondary-side conversion circuit.

[0043] In this embodiment, by setting up an isolation circuit, the primary-side conversion circuit and the secondary-side conversion circuit can be isolated from each other, effectively improving the line safety of the sodium-ion battery pack 4 power supply line. By reusing the primary-side conversion circuit, the isolation circuit, and the secondary-side conversion circuit, the manufacturing cost of the sodium-ion battery charging and discharging control system can be reduced.

[0044] In some embodiments, the primary-side conversion circuit includes a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4;

[0045] Specifically, the connection point between the source of the first switch Q1 and the drain of the second switch Q2 is electrically connected to the negative terminal of the first end of the isolation circuit; the connection point between the source of the third switch Q3 and the drain of the fourth switch Q4 is electrically connected to the positive terminal of the first end of the isolation circuit; the connection point between the drain of the first switch Q1 and the drain of the third switch Q3 is electrically connected to the positive terminal of the first end of the sodium-ion battery pack 4; and the connection point between the source of the second switch Q2 and the source of the fourth switch Q4 is electrically connected to the negative terminal of the first end of the sodium-ion battery pack 4.

[0046] In this embodiment, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 can be MOSFETs. The first switch Q1 and the fourth switch Q4 form one set of switches, and the second switch Q2 and the third switch Q3 form another set of switches. These two sets of switches are controlled by the first control circuit 1 and are alternately turned on under the control of the first control circuit 1, so that the primary-side conversion circuit can convert the DC power output from the sodium-ion battery pack 4 into AC power, so that the converted AC power is input into the isolation circuit and output to the secondary-side conversion circuit.

[0047] In some embodiments, the secondary-side switching circuit includes a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, and an eighth switch Q8;

[0048] Specifically, the connection point between the source of the fifth switch Q5 and the drain of the sixth switch Q6 is electrically connected to the positive terminal of the first end of the isolation circuit; the connection point between the source of the seventh switch Q7 and the drain of the eighth switch Q8 is electrically connected to the negative terminal of the first end of the isolation circuit; the connection point between the drain of the fifth switch Q5 and the drain of the seventh switch Q7 is electrically connected to the positive terminal of the first end of the energy storage converter 5; and the connection point between the source of the sixth switch Q6 and the source of the eighth switch Q8 is electrically connected to the negative terminal of the first end of the energy storage converter 5.

[0049] In this embodiment, the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 can be MOSFETs. The fifth switch Q5 and the eighth switch Q8 form one set of switches, and the sixth switch Q6 and the seventh switch Q7 form another set of switches. These two sets of switches are controlled by the first control circuit 1 and are alternately turned on under the control of the first control circuit 1, so that the secondary-side conversion circuit can convert the AC power output from the isolation circuit into DC power, and input the converted DC power into the energy storage converter 5.

[0050] In some embodiments, such as Figure 1 As shown, the isolation circuit includes a first inductor L1, a second inductor L2, a sixth capacitor C6, a seventh capacitor C7, and a first transformer T1;

[0051] Wherein, the first end of the first inductor L1 is electrically connected to the positive terminal of the second end of the primary-side conversion circuit, the second end of the first inductor L1 is electrically connected to the first end of the primary-side coil of the first transformer T1, the first end of the sixth capacitor C6 is electrically connected to the negative terminal of the second end of the primary-side conversion circuit, and the second end of the sixth capacitor C6 is electrically connected to the second end of the primary-side coil of the first transformer T1.

[0052] Wherein, the first end of the second inductor L2 is electrically connected to the positive terminal of the first terminal of the secondary-side conversion circuit, the second end of the second inductor L2 is electrically connected to the first terminal of the secondary-side coil of the first transformer T1, the first end of the seventh capacitor C7 is electrically connected to the negative terminal of the first terminal of the secondary-side conversion circuit, and the second end of the seventh capacitor C7 is electrically connected to the second terminal of the secondary-side coil of the first transformer T1.

[0053] In this embodiment, an LC resonant filter circuit is formed by setting a first inductor L1 and a sixth capacitor C6 to improve the stability of the AC output of the primary-side conversion circuit.

[0054] In some embodiments, the detection power supply circuit includes a second transformer T2, a first detection power supply circuit, and a second detection power supply circuit;

[0055] Specifically, the primary winding of the second transformer T2 is electrically connected to the second terminal of the secondary conversion circuit, the first secondary winding of the second transformer T2 is electrically connected to the first terminal of the first detection power supply circuit, the output terminal of the first detection power supply circuit is electrically connected to the first input terminal of the second control circuit 2, the second secondary winding of the second transformer T2 is electrically connected to the first terminal of the second detection power supply circuit, and the output terminal of the second detection power supply circuit is electrically connected to the second input terminal of the second control circuit 2.

[0056] In this embodiment, by setting a second transformer T2, the second control circuit 2 and the energy storage converter 5 can be isolated, effectively improving the safety factor of the conversion circuit. By setting a first detection power supply circuit and a second detection power supply circuit, different voltage values ​​of electrical energy can be provided to the second control circuit 2 to meet the different voltage values ​​required internally by the second control circuit 2.

[0057] In some embodiments, the first detection power supply circuit includes a first step-down circuit U1, a first capacitor C1, and a second capacitor C2; the second detection power supply circuit includes a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5.

[0058] Wherein, the input terminal of the first step-down circuit U1 is electrically connected to the first terminal of the first secondary coil of the second transformer T2, the output terminal of the first step-down circuit U1 is electrically connected to the positive terminal of the first input terminal of the second control circuit 2, the first capacitor C1 is connected between the input terminal and the ground terminal of the first step-down circuit U1, the second capacitor C2 is connected between the output terminal and the ground terminal of the first step-down circuit U1, and the connection point between the ground terminal of the first step-down circuit U1 and the second terminal of the first secondary coil is electrically connected to the negative terminal of the input terminal of the second control circuit 2;

[0059] The first end of the second secondary coil is electrically connected to the positive terminal of the second input terminal of the second control circuit 2, and the second end of the second secondary coil is electrically connected to the negative terminal of the second input terminal of the second control circuit 2. The third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 are respectively connected across the positive and negative terminals of the second input terminal of the second control circuit 2.

[0060] In this embodiment, the first step-down circuit U1 can be a step-down chip or a Buck circuit, and is not limited thereto. By setting the first detection circuit, the AC power output from the second transformer T2 can be converted to output electrical energy with a first voltage value. By setting the second detection power supply circuit, electrical energy with a second voltage value can be output to realize the different voltage values ​​required by the second control circuit 2.

[0061] In some embodiments, the detection power supply circuit further includes a first diode D1 and a second diode D2;

[0062] Wherein, the anode of the first diode D1 is electrically connected to the first end of the first secondary coil of the second transformer T2, and the cathode of the first diode D1 is electrically connected to the input terminal of the first step-down circuit U1; the anode of the second diode D2 is electrically connected to the first end of the second secondary coil of the second transformer T2, and the cathode of the second diode D2 is electrically connected to the positive terminal of the second input terminal of the second control circuit 2.

[0063] In this embodiment, by setting a first diode D1 and a second diode D2, the diodes act as anti-reverse diodes, which can effectively prevent damage to electronic equipment or circuits when the power supply polarity is reversed.

[0064] The power supply device of this disclosure includes a power supply unit, which is a control system for charging and discharging sodium-ion batteries in any of the above embodiments.

[0065] In some embodiments, the device further includes a sodium-ion battery pack 4, which is electrically connected to a first terminal of the conversion circuit of the power supply device.

[0066] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A control system for charging and discharging a sodium-ion battery, characterized in that, The system includes a first control circuit, a second control circuit, a conversion circuit, and multiple temperature sensors; Wherein, the first terminal of the conversion circuit is electrically connected to the first terminal of the sodium-ion battery pack of the system, the second terminal of the conversion circuit is electrically connected to the energy storage converter of the system, the third terminal of the conversion circuit is electrically connected to the input terminal of the second control circuit, the output terminal of the second control circuit is electrically connected to multiple temperature sensors, and some components of the conversion circuit are multiplexed by the second control circuit and the energy storage converter; The first terminal of the first control circuit is communicatively connected to the fourth terminal of the conversion circuit.

2. The system according to claim 1, characterized in that, The conversion circuit includes a primary-side conversion circuit, an isolation circuit, a secondary-side conversion circuit, and a detection and power supply circuit; Wherein, the first terminal of the primary-side conversion circuit is electrically connected to the first terminal of the sodium-ion battery pack, the second terminal of the primary-side conversion circuit is electrically connected to the first terminal of the isolation circuit, the second terminal of the isolation circuit is electrically connected to the first terminal of the secondary-side conversion circuit, the second terminal of the secondary-side conversion circuit is electrically connected to the energy storage converter of the system, the input terminal of the detection power supply circuit is electrically connected to the second terminal of the secondary-side conversion circuit, and the output terminal of the detection power supply circuit is electrically connected to the first terminal of the control circuit; The components of the conversion circuit include a primary-side conversion circuit, an isolation circuit, and a secondary-side conversion circuit.

3. The system according to claim 2, characterized in that, The primary-side conversion circuit includes a first switch, a second switch, a third switch, and a fourth switch. Specifically, the connection point between the source of the first switching transistor and the drain of the second switching transistor is electrically connected to the negative terminal of the first end of the isolation circuit; the connection point between the source of the third switching transistor and the drain of the fourth switching transistor is electrically connected to the positive terminal of the first end of the isolation circuit; the connection point between the drain of the first switching transistor and the drain of the third switching transistor is electrically connected to the positive terminal of the first end of the sodium-ion battery pack; and the connection point between the source of the second switching transistor and the source of the fourth switching transistor is electrically connected to the negative terminal of the first end of the sodium-ion battery pack.

4. The system according to claim 2, characterized in that, The secondary-side switching circuit includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch; Specifically, the connection point between the source of the fifth switching transistor and the drain of the sixth switching transistor is electrically connected to the positive terminal of the first end of the isolation circuit; the connection point between the source of the seventh switching transistor and the drain of the eighth switching transistor is electrically connected to the negative terminal of the first end of the isolation circuit; the connection point between the drain of the fifth switching transistor and the drain of the seventh switching transistor is electrically connected to the positive terminal of the first end of the energy storage converter; and the connection point between the source of the sixth switching transistor and the source of the eighth switching transistor is electrically connected to the negative terminal of the first end of the energy storage converter.

5. The system according to claim 2, characterized in that, The isolation circuit includes a first inductor, a second inductor, a sixth capacitor, a seventh capacitor, and a first transformer; Wherein, the first end of the first inductor is electrically connected to the positive terminal of the second end of the primary-side conversion circuit, the second end of the first inductor is electrically connected to the first end of the primary-side coil of the first transformer, the first end of the sixth capacitor is electrically connected to the negative terminal of the second end of the primary-side conversion circuit, and the second end of the sixth capacitor is electrically connected to the second end of the primary-side coil of the first transformer. Wherein, the first end of the second inductor is electrically connected to the positive terminal of the first terminal of the secondary-side conversion circuit, the second end of the second inductor is electrically connected to the first terminal of the secondary-side coil of the first transformer, the first end of the seventh capacitor is electrically connected to the negative terminal of the first terminal of the secondary-side conversion circuit, and the second end of the seventh capacitor is electrically connected to the second terminal of the secondary-side coil of the first transformer.

6. The system according to claim 2, characterized in that, The detection power supply circuit includes a second transformer, a first detection power supply circuit, and a second detection power supply circuit. Wherein, the primary winding of the second transformer is electrically connected to the second terminal of the secondary conversion circuit, the first secondary winding of the second transformer is electrically connected to the first terminal of the first detection power supply circuit, the output terminal of the first detection power supply circuit is electrically connected to the first input terminal of the second control circuit, the second secondary winding of the second transformer is electrically connected to the first terminal of the second detection power supply circuit, and the output terminal of the second detection power supply circuit is electrically connected to the second input terminal of the second control circuit.

7. The system according to claim 6, characterized in that, The first detection power supply circuit includes a first step-down circuit, a first capacitor, and a second capacitor; the second detection power supply circuit includes a third capacitor, a fourth capacitor, and a fifth capacitor. Wherein, the input terminal of the first step-down circuit is electrically connected to the first terminal of the first secondary coil of the second transformer, the output terminal of the first step-down circuit is electrically connected to the positive terminal of the first input terminal of the second control circuit, the first capacitor is connected between the input terminal and the ground terminal of the first step-down circuit, the second capacitor is connected between the output terminal and the ground terminal of the first step-down circuit, and the connection point between the ground terminal of the first step-down circuit and the second terminal of the first secondary coil is electrically connected to the negative terminal of the input terminal of the second control circuit. The first end of the second secondary coil is electrically connected to the positive terminal of the second input terminal of the second control circuit, and the second end of the second secondary coil is electrically connected to the negative terminal of the second input terminal of the second control circuit. The third capacitor, the fourth capacitor, and the fifth capacitor are respectively connected across the positive and negative terminals of the second input terminal of the second control circuit.

8. The system according to claim 7, characterized in that, The detection power supply circuit also includes a first diode and a second diode; The anode of the first diode is electrically connected to the first end of the first secondary coil of the second transformer, and the cathode of the first diode is electrically connected to the input terminal of the first step-down circuit; the anode of the second diode is electrically connected to the first end of the second secondary coil of the second transformer, and the cathode of the second diode is electrically connected to the positive terminal of the second input terminal of the second control circuit.

9. A power supply device, characterized in that, The device includes: A power supply device, wherein the power supply device is a control system for charging and discharging a sodium-ion battery as described in any one of claims 1 to 8.

10. The power supply equipment according to claim 9, characterized in that, The device also includes a sodium-ion battery pack, which is electrically connected to the first terminal of the conversion circuit of the power supply device.

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