Battery replacement cabinet power supply system and battery replacement cabinet
By independently heating each battery grid in the power supply system of the battery swap cabinet, the problems of difficult battery charging, high energy consumption and safety hazards in low temperature environments are solved, and more efficient and reliable battery charging and system stability are achieved.
Patent Information
- Application Number
- CN202420696006.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-04-07
AI Technical Summary
The existing battery swap cabinet power system is difficult to charge the battery, has high energy consumption and has great safety risks in low temperature environments, especially when the grid utilization rate is low and the heating package is uniformly heated, there are resource waste and safety risks.
A battery swap cabinet power system is designed, in which each battery grid is heated independently, and the independent power supply between the heating module and the battery module of each battery grid is realized through the DC DC conversion module and the switching unit, and the power factor correction unit and Control unit optimizes power management.
It realizes efficient heating of each battery grid, reduces overall energy consumption, improves the reliability and stability of the battery swap cabinet, simplifies the electrical system, and saves space.
Smart Images
Figure CN222365630U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery charging, and in particular to a power supply system of a battery exchange cabinet and a battery exchange cabinet. Background Art
[0002] In recent years, consumers have been increasingly demanding online shopping and food delivery, which has promoted the booming food delivery market and the popularity of shared electric bikes. As a result, electric bikes have become increasingly popular as a means of material delivery and daily travel, and the market demand for battery swap cabinets has also grown dramatically. However, problems such as difficulty in charging electric vehicle batteries in winter, slow charging, and many charging risks have become increasingly prominent and need to be addressed urgently.
[0003] In order to solve the problem of difficulty in charging electric vehicle batteries in winter, some battery swap cabinets have adopted the solution of installing a heating pack inside the battery swap cabinet. The heating pack can heat the battery to ensure normal charging of the battery in a low temperature environment. The commonly used power supply system of the battery swap cabinet currently determines whether to trigger the power supply of the heating pack by collecting the temperature of the battery in the battery swap cabinet, and then the heating pack heats the battery, thereby improving the charging efficiency of the battery when the ambient temperature is low.
[0004] In the above-mentioned power exchange cabinet power supply system, the heating pack heats the entire power exchange cabinet uniformly. However, the utilization rate of the power exchange cabinet slots is generally less than 50%. When only a small number of batteries are charged, the heating pack consumes a lot of energy to heat the entire power exchange cabinet uniformly, which will cause resource waste and increase costs; and the temperature of the chip in the heating pack is high, which poses certain safety risks if used for a long time. Utility Model Content
[0005] The utility model aims to provide a power supply system of a power exchange cabinet and a power exchange cabinet.
[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is:
[0007] A power supply system for a power exchange cabinet comprises a first DC-DC conversion unit, a second DC-DC conversion unit and a switch unit, wherein the second end of the first DC-DC conversion unit is connected to the first end of the second DC-DC conversion unit, the second end of the second DC-DC conversion unit is connected to the switch unit, the second DC-DC conversion unit comprises N DC-DC conversion modules, and the switch unit comprises M switches, wherein M is an integer, N is an integer, and M=2N; the first end of each of the DC-DC conversion modules is connected in parallel to the first end of the first DC-DC conversion unit, the positive pole of the second end of each of the DC-DC conversion modules is respectively connected to the positive pole of a heating module of a battery grid through a switch, the positive pole of the second end of each of the DC-DC conversion modules is respectively connected to the positive pole of a battery module of a battery grid through a switch, and the negative pole of the second end of each of the DC-DC conversion modules is respectively connected to the negative pole of a heating module of a battery grid and the negative pole of the battery module.
[0008] The above-mentioned power supply system for the power exchange cabinet also includes a power factor correction unit, a first end of the power factor correction unit is connected to the alternating current, and a second end of the power factor correction unit is connected to the first end of the first direct current to direct current conversion unit.
[0009] In a specific embodiment, the power factor correction unit includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first inductor, a second inductor, a first switch, a second switch and a first capacitor, wherein the anode of the first diode is connected to the first end of the alternating current and the cathode of the second diode, the cathode of the first diode is connected to the cathode of the third diode, the anode of the third diode is connected to the cathode of the fourth diode and the second end of the alternating current, the anode of the fourth diode is connected to the anode of the second diode, the cathode of the third diode is connected to the first end of the first inductor and the first end of the second inductor, the second end of the first inductor is connected to the anode of the fifth diode, the second end of the second inductor is connected to the anode of the sixth diode, the cathode of the fifth diode is connected to the cathode of the sixth diode, the drain of the first switch is connected to the second end of the first inductor, the source of the first switch is connected to the anode of the fourth diode, the drain of the second switch is connected to the second end of the second inductor, the source of the second switch is connected to the anode of the fourth diode, the first end of the first capacitor is connected to the cathode of the fifth diode, the second end of the first capacitor is connected to the source of the second switch, and the first DC is output from both ends of the first capacitor.
[0010] In a specific embodiment, the first DC-DC conversion unit includes a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a third inductor, a first transformer and a second transformer, the drain of the third switch is connected to the positive electrode of the first DC power, the source of the third switch is connected to the drain of the fourth switch, the source of the fourth switch is connected to the negative electrode of the first DC power, the first end of the second capacitor is connected to the drain of the third switch, the second end of the second capacitor is connected to the first end of the third capacitor, the second end of the third capacitor is connected to the source of the fourth switch, the source of the third switch is connected to the first end of the third inductor, the second end of the third inductor is connected to the first end of the primary winding of the first transformer, the second end of the primary winding of the first transformer is connected to the first end of the third capacitor, the first end of the secondary winding of the first transformer is connected to the drain of the fifth switch, and the The source is connected to the first end of the fourth capacitor, the second end of the fourth capacitor is connected to the middle end of the secondary winding of the first transformer, the second end of the secondary winding of the first transformer is connected to the drain of the sixth switch, and the source of the sixth switch is connected to the source of the fifth switch; the second end of the third inductor is connected to the first end of the primary winding of the second transformer, the second end of the primary winding of the second transformer is connected to the first end of the third capacitor, the first end of the secondary winding of the second transformer is connected to the drain of the seventh switch, the source of the seventh switch is connected to the first end of the fifth capacitor, the second end of the fifth capacitor is connected to the middle end of the secondary winding of the second transformer, the second end of the secondary winding of the second transformer is connected to the drain of the eighth switch, the source of the eighth switch is connected to the source of the seventh switch, the second end of the fourth capacitor is connected to the first end of the fifth capacitor, the first end of the fourth capacitor is the positive electrode of the second direct current, and the second end of the fifth capacitor is the negative electrode of the second direct current.
[0011] In a specific embodiment, the DC-DC conversion module includes a ninth switch, a tenth switch, a seventh diode, an eighth diode, a fourth inductor and a sixth capacitor, the positive electrode of the second DC power is connected to the drain of the ninth switch, the source of the ninth switch is connected to the cathode of the seventh diode, the anode of the seventh diode is connected to the negative electrode of the second DC power, the cathode of the seventh diode is connected to the drain of the tenth switch through the fourth inductor, the source of the tenth switch is connected to the anode of the seventh diode, the drain of the tenth switch is connected to the anode of the eighth diode, the cathode of the eighth diode is connected to the first end of the sixth capacitor, the second end of the sixth capacitor is connected to the source of the tenth switch, the first end of the sixth capacitor is the positive electrode of the third DC power, and the second end of the sixth capacitor is the negative electrode of the third DC power.
[0012] In a specific embodiment, the switch of the switch unit is a relay.
[0013] In a specific embodiment, the switch of the switch unit is a MOSFET.
[0014] The utility model also provides a power exchange cabinet, including the above-mentioned power exchange cabinet power supply system, and also includes N battery grids, each battery grid includes a heating module and a battery module, the positive pole of the second end of each DC-DC conversion module is connected to the positive pole of the heating module of a battery grid through a switch, the positive pole of the second end of each DC-DC conversion module is connected to the positive pole of the battery module of a battery grid through a switch, and the negative pole of the second end of each DC-DC conversion module is connected to the negative pole of the heating module of a battery grid and the negative pole of the battery module.
[0015] In a specific embodiment, the above-mentioned power exchange cabinet also includes a control unit, and the control unit controls the on and off of the switch in the switch unit.
[0016] Beneficial effect: The utility model provides a power supply system for a battery swap cabinet and a battery swap cabinet, which can heat each battery compartment individually, thereby saving costs while simplifying the electrical system, improving the reliability and stability of the power supply system of the battery swap cabinet, and saving space in the battery swap cabinet.
[0017] In order to make the above features and advantages of the utility model more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of a power supply system of a power exchange cabinet of the utility model.
[0019] Figure 2 for Figure 1 A circuit diagram of a specific embodiment of a power factor correction unit 1.
[0020] Figure 3 for Figure 1 A circuit diagram of a specific embodiment of the first DC-DC conversion unit 2 is shown in FIG.
[0021] Figure 4 for Figure 1 FIG. 1 is a circuit diagram of a specific embodiment of the first DC-DC conversion module 31. FIG. DETAILED DESCRIPTION
[0022] In order to make the purpose and technical solution of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] Figure 1 This is a schematic diagram of the structure of a power supply system for a power exchange cabinet of the utility model. Figure 1 As shown, the utility model provides a power supply system for a power exchange cabinet, including a power factor correction unit 1, a first DC-DC conversion unit 2, a second DC-DC conversion unit 3, and a switch unit 4. The first end of the power factor correction unit 1 is connected to an AC power source u AC The second end of the power factor correction unit 1 is connected to the first end of the first DC-DC conversion unit 2, the second end of the first DC-DC conversion unit 2 is connected to the first end of the second DC-DC conversion unit 3, the second end of the second DC-DC conversion unit 3 is connected to the first end of the switch unit 4, and the second end of the switch unit 4 is connected to the power exchange cabinet grid 5.
[0024] Further, the second DC-DC conversion unit 3 includes N DC-DC conversion modules, specifically a first DC-DC conversion module 31, a second DC-DC conversion module 32, up to an Nth DC-DC conversion module 3N, and the first ends of the first DC-DC conversion module 31, the second DC-DC conversion module 32, up to the Nth DC-DC conversion module 3N are all connected in parallel to the second end of the first DC-DC conversion unit 2, where N is an integer.
[0025] Furthermore, the switch unit 4 includes M switches, specifically switch S1, switch S2, and switch SM. The power exchange cabinet grid 5 includes N battery grids, specifically a first battery grid 51, a second battery grid 52, and an Nth battery grid 5N. Each battery grid includes a battery grid heating module and a battery grid battery module. The first battery grid 51 includes a first battery grid heating module 511 and a first battery grid battery module 512. The second battery grid 52 includes a second battery grid heating module 521 and a second battery grid battery module 522, and the Nth battery grid 5N includes an Nth battery grid heating module 5N1 and an Nth battery grid battery module 5N2. The positive electrode of the second end of the first DC-DC conversion module 31 is connected to the positive electrode of the first end of the first battery grid heating module 511 through the switch S1, the negative electrode of the second end of the first DC-DC conversion module 31 is connected to the negative electrode of the first end of the first battery grid heating module 511, the positive electrode of the second end of the first DC-DC conversion module 31 is connected to the positive electrode of the first end of the first battery grid battery module 512 through the switch S2, and the negative electrode of the second end of the first DC-DC conversion module 31 is connected to the negative electrode of the first end of the first battery grid battery module 512; the positive electrode of the second end of the second DC-DC conversion module 32 is connected to the positive electrode of the first end of the second battery grid heating module 521 through the switch S3, the negative electrode of the second end of the second DC-DC conversion module 32 is connected to the negative electrode of the first end of the second battery grid heating module 521, and the second The positive electrode of the second end of the DC-DC conversion module 32 is connected to the positive electrode of the first end of the second battery cell module 522 through the switch S4, and the negative electrode of the second end of the first DC-DC conversion module 32 is connected to the negative electrode of the first end of the second battery cell module 522; by analogy, the positive electrode of the second end of the Nth DC-DC conversion module 3N is connected to the positive electrode of the first end of the Nth battery cell heating module 5N1 through the switch S (M-1), the negative electrode of the second end of the second DC-DC conversion module 3N is connected to the negative electrode of the first end of the Nth battery cell heating module 5N1, the positive electrode of the second end of the second DC-DC conversion module 3N is connected to the positive electrode of the first end of the Nth battery cell module 5N2 through the switch SM, and the negative electrode of the second end of the Nth DC-DC conversion module 3N is connected to the negative electrode of the first end of the Nth battery cell module 5N2. Wherein, M is an integer, M=2N.
[0026] Optionally, the switch S1 , the switch S2 , and up to the switch SM include but are not limited to a relay, a MOSFET, and the like.
[0027] Optionally, the switch S1, the switch S2, and the switch SM may be a single switch tube or a pair of switch tubes.
[0028] More specifically, the power factor correction unit 1 converts the AC power u ACThe first DC-DC conversion unit 2 converts the DC power V1 into DC power V2 and outputs it to multiple DC-DC conversion modules, including the first DC-DC conversion module 31, the second DC-DC conversion module 32, and the Nth DC-DC conversion module 3N. 31 , DC V 32 Until DC V 3N , supplying power to each battery grid heating module and each battery grid battery module.
[0029] More specifically, switches S1 to SM are controlled by a control unit (not shown in the figure), and the output of each DC-DC conversion module can power the battery compartment heating module and the battery compartment battery module of the same battery compartment. Taking the first DC-DC conversion module 31 as an example, switch S1 and switch S2 cannot be turned on at the same time. When the temperature of the battery module 512 of the first battery compartment is too low, switch S1 is turned on to power the first battery compartment heating module 511, and the first battery compartment heating module 511 starts heating. After the temperature of the battery module 512 of the first battery compartment rises to a temperature that allows charging, switch S1 is turned off, and switch S2 is turned on to charge the battery module 512 of the first battery compartment. The power supply process of other DC-DC conversion modules is similar to the above, thereby realizing the function that the output of a DC-DC conversion module can simultaneously power the heating module and charge the battery module.
[0030] It can be seen that for a battery swap cabinet with N battery slots, a battery swap cabinet power supply system with N outputs can be used. Taking a battery swap cabinet with 6 battery slots as an example, a battery swap cabinet power supply system with 6 outputs can be used. Compared with the traditional solution of uniformly heating the entire battery swap cabinet with a heating pack, the utility model provides a battery swap cabinet power supply system that can heat each battery slot individually, which saves costs while simplifying the electrical system, improves the reliability and stability of the battery swap cabinet power supply system, and saves space in the battery swap cabinet.
[0031] Optionally, the voltage or current supplied to the battery grid heating module and the battery grid battery module can be adjusted according to demand by communicating with the power supply system of the battery swap cabinet. More specifically, after the temperature of the battery grid battery module meets the charging requirements, the switch connected to the battery grid heating module is turned off, and the voltage and current required for charging the battery grid battery module are reset, and the switch connected to the battery grid battery module is turned on to charge the battery grid battery module.
[0032] Figure 2 for Figure 1 A circuit diagram of a specific embodiment of a power factor correction unit 1 is shown in FIG. Figure 2As shown, the power factor correction unit 1 includes a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, an inductor L1, an inductor L2, a switch Q1, a switch Q2 and a capacitor C1, and the anode of the diode D1 is connected to the AC u AC The first end of the diode D1 is connected to the cathode of the diode D2, the cathode of the diode D1 is connected to the cathode of the diode D3, and the anode of the diode D3 is connected to the cathode of the diode D4 and the alternating current u AC The second end of the inductor L1 is connected to the anode of the diode D4, the cathode of the diode D3 is connected to the first end of the inductor L1 and the first end of the inductor L2, the second end of the inductor L1 is connected to the anode of the diode D5, the second end of the inductor L2 is connected to the anode of the diode D6, the cathode of the diode D5 is connected to the cathode of the diode D6, the drain of the switch Q1 is connected to the second end of the inductor L1, the source of the switch Q1 is connected to the anode of the diode D4, the drain of the switch Q2 is connected to the second end of the inductor L2, the source of the switch Q2 is connected to the anode of the diode D4, the first end of the capacitor C1 is connected to the cathode of the diode D5, the second end of the capacitor C1 is connected to the source of the switch Q2, and the two ends of the capacitor C1 output a direct current V1.
[0033] More specifically, the switch Q1 and the switch Q2 are N-type MOSFETs.
[0034] Optionally, the first DC-DC conversion unit 2 adopts an isolated DC-DC conversion circuit. Figure 3 for Figure 1 A circuit diagram of a specific embodiment of the first DC-DC conversion unit 2 is shown in FIG. Figure 3As shown, the first DC-DC conversion unit 2 includes a switch Q3, a switch Q4, a switch Q5, a switch Q6, a switch Q7, a switch Q8, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, an inductor L3, a transformer T1 and a transformer T2, the drain of the switch Q3 is connected to the positive electrode of the DC power V1, the source of the switch Q3 is connected to the drain of the switch Q4, the source of the switch Q4 is connected to the negative electrode of the DC power V1, the first end of the capacitor C2 is connected to the drain of the switch Q3, the second end of the capacitor C2 is connected to the first end of the capacitor C3, the second end of the capacitor C3 is connected to the source of the switch Q4, and the The source is connected to the first end of the inductor L3, the second end of the inductor L3 is connected to the first end of the primary winding of the transformer T1, the second end of the primary winding of the transformer T1 is connected to the first end of the capacitor C3, the excitation inductor Lm1 is connected in parallel to the two ends of the primary winding of the transformer T1, the first end of the secondary winding of the transformer T1 is connected to the drain of the switch Q5, the source of the switch Q5 is connected to the first end of the capacitor C4, the second end of the capacitor C4 is connected to the middle end of the secondary winding of the transformer T1, the second end of the secondary winding of the transformer T1 is connected to the drain of the switch Q6, and the source of the switch Q6 is connected to the source of the switch Q5. The second end of the inductor L3 is connected to the first end of the primary winding of the transformer T2, the second end of the primary winding of the transformer T2 is connected to the first end of the capacitor C3, the first end of the secondary winding of the transformer T2 is connected to the drain of the switch Q7, the source of the switch Q7 is connected to the first end of the capacitor C5, the second end of the capacitor C5 is connected to the middle end of the secondary winding of the transformer T2, the second end of the secondary winding of the transformer T2 is connected to the drain of the switch Q8, the source of the switch Q8 is connected to the source of the switch Q7, the second end of the capacitor C4 is connected to the first end of the capacitor C5, the first end of the capacitor C4 is the positive electrode of the direct current V2, and the second end of the capacitor C5 is the negative electrode of the direct current V2.
[0035] More specifically, the switch Q3 , the switch Q4 , the switch Q5 , the switch Q6 , the switch Q7 , and the switch Q8 are N-type MOSFETs.
[0036] Optionally, the first DC-DC conversion module 31 , the second DC-DC conversion module 32 , and up to the Nth DC-DC conversion module 3N are non-isolated DC-DC conversion modules. Figure 4 for Figure 1 FIG. 3 is a circuit diagram of a specific embodiment of the first DC-DC conversion module 31. Figure 4As shown, the first DC-DC conversion module 31 is a BUCK-BOOST topology, and the first DC-DC conversion module 31 includes a switch Q9, a switch Q10, a diode D7, a diode D8, an inductor L4 and a capacitor C6, the positive electrode of the DC power V2 is connected to the drain of the switch Q9, the source of the switch Q9 is connected to the cathode of the diode D7, the anode of the diode D7 is connected to the negative electrode of the DC power V2, the cathode of the diode D7 is connected to the drain of the switch Q10 through the inductor L4, the source of the switch Q10 is connected to the anode of the diode D7, the drain of the switch Q10 is connected to the anode of the diode D8, the cathode of the diode D8 is connected to the first end of the capacitor C6, the second end of the capacitor C6 is connected to the source of the switch Q10, and the first end of the capacitor C6 is the DC power V 31 The positive electrode of the capacitor C6 is a DC voltage V 31 of the negative electrode.
[0037] More specifically, the switch Q9 and the switch Q10 are N-type MOSFETs.
[0038] The circuit topology of the second DC-DC conversion module 32 to the Nth DC-DC conversion module 3N is the same as that of the first DC-DC conversion module 31 , and will not be described in detail herein.
[0039] The utility model also provides a power exchange cabinet, which includes the above-mentioned power exchange cabinet power supply system and power exchange cabinet grid, the power exchange cabinet grid includes multiple battery grids, each battery grid includes a battery grid heating module and a battery grid battery module, and the power exchange cabinet power supply system supplies power to the battery grid heating module and the battery grid battery module.
[0040] Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.
Claims
1. A power supply system for a power exchange cabinet, characterized in that: It includes a first DC-DC conversion unit, a second DC-DC conversion unit and a switch unit, wherein the second end of the first DC-DC conversion unit is connected to the first end of the second DC-DC conversion unit, the second end of the second DC-DC conversion unit is connected to the switch unit, the second DC-DC conversion unit includes N DC-DC conversion modules, and the switch unit includes M switches, wherein M is an integer, N is an integer, and M=2N; the first end of each DC-DC conversion module is connected in parallel to the first end of the first DC-DC conversion unit, the positive electrode of the second end of each DC-DC conversion module is respectively connected to the positive electrode of a heating module of a battery grid through a switch, the positive electrode of the second end of each DC-DC conversion module is respectively connected to the positive electrode of a battery module of a battery grid through a switch, and the negative electrode of the second end of each DC-DC conversion module is respectively connected to the negative electrode of the heating module of a battery grid and the negative electrode of the battery module.
2. A power supply system for a power exchange cabinet as claimed in claim 1, characterized in that: It also includes a power factor correction unit, a first end of which is connected to alternating current, and a second end of which is connected to a first end of the first direct current to direct current conversion unit.
3. A power supply system for a power exchange cabinet as claimed in claim 2, characterized in that: The power factor correction unit includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first inductor, a second inductor, a first switch, a second switch and a first capacitor, wherein an anode of the first diode is connected to a first end of the alternating current and a cathode of the second diode, a cathode of the first diode is connected to a cathode of the third diode, an anode of the third diode is connected to a cathode of the fourth diode and a second end of the alternating current, an anode of the fourth diode is connected to an anode of the second diode, a cathode of the third diode is connected to a first end of the first inductor and a first end of the second inductor, a second end of the first inductor is connected to an anode of the fifth diode, a second end of the second inductor is connected to an anode of the sixth diode, a cathode of the fifth diode is connected to a cathode of the sixth diode, a drain of the first switch is connected to a second end of the first inductor, a source of the first switch is connected to an anode of the fourth diode, a drain of the second switch is connected to a second end of the second inductor, a source of the second switch is connected to an anode of the fourth diode, a first end of the first capacitor is connected to a cathode of the fifth diode, a second end of the first capacitor is connected to a source of the second switch, and first direct current is output from both ends of the first capacitor.
4. A power supply system for a power exchange cabinet as claimed in claim 3, characterized in that: The first DC-DC conversion unit includes a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a third inductor, a first transformer and a second transformer, wherein the drain of the third switch is connected to the positive electrode of the first DC power, the source of the third switch is connected to the drain of the fourth switch, the source of the fourth switch is connected to the negative electrode of the first DC power, the first end of the second capacitor is connected to the drain of the third switch, the second end of the second capacitor is connected to the first end of the third capacitor, the second end of the third capacitor is connected to the source of the fourth switch, the source of the third switch is connected to the first end of the third inductor, the second end of the third inductor is connected to the first end of the primary winding of the first transformer, the second end of the primary winding of the first transformer is connected to the first end of the third capacitor, the first end of the secondary winding of the first transformer is connected to the drain of the fifth switch, the source of the fifth switch is connected to the The first end of the fourth capacitor and the second end of the fourth capacitor are connected to the middle end of the secondary winding of the first transformer, the second end of the secondary winding of the first transformer is connected to the drain of the sixth switch, and the source of the sixth switch is connected to the source of the fifth switch; the second end of the third inductor is connected to the first end of the primary winding of the second transformer, the second end of the primary winding of the second transformer is connected to the first end of the third capacitor, the first end of the secondary winding of the second transformer is connected to the drain of the seventh switch, the source of the seventh switch is connected to the first end of the fifth capacitor, the second end of the fifth capacitor is connected to the middle end of the secondary winding of the second transformer, the second end of the secondary winding of the second transformer is connected to the drain of the eighth switch, the source of the eighth switch is connected to the source of the seventh switch, the second end of the fourth capacitor is connected to the first end of the fifth capacitor, the first end of the fourth capacitor is the positive electrode of the second direct current, and the second end of the fifth capacitor is the negative electrode of the second direct current.
5. A power supply system for a power exchange cabinet as claimed in claim 4, characterized in that: The DC-DC conversion module includes a ninth switch, a tenth switch, a seventh diode, an eighth diode, a fourth inductor and a sixth capacitor, the positive electrode of the second DC is connected to the drain of the ninth switch, the source of the ninth switch is connected to the cathode of the seventh diode, the anode of the seventh diode is connected to the negative electrode of the second DC, the cathode of the seventh diode is connected to the drain of the tenth switch through the fourth inductor, the source of the tenth switch is connected to the anode of the seventh diode, the drain of the tenth switch is connected to the anode of the eighth diode, the cathode of the eighth diode is connected to the first end of the sixth capacitor, the second end of the sixth capacitor is connected to the source of the tenth switch, the first end of the sixth capacitor is the positive electrode of the third DC, and the second end of the sixth capacitor is the negative electrode of the third DC.
6. A power supply system for a power exchange cabinet as claimed in claim 1, characterized in that: The switch of the switch unit is a relay.
7. A power supply system for a power exchange cabinet as claimed in claim 1, characterized in that: The switch of the switch unit is a MOSFET.
8. A power exchange cabinet, characterized in that: It comprises a power supply system for a battery exchange cabinet as described in any one of claims 1 to 7, and also comprises N battery grids, each battery grid comprises a heating module and a battery module, the positive pole of the second end of each DC-DC conversion module is respectively connected to the positive pole of the heating module of a battery grid through a switch, the positive pole of the second end of each DC-DC conversion module is respectively connected to the positive pole of the battery module of a battery grid through a switch, and the negative pole of the second end of each DC-DC conversion module is respectively connected to the negative pole of the heating module of a battery grid and the negative pole of the battery module.
9. A power exchange cabinet as claimed in claim 8, characterized in that: It also includes a control unit, which controls the on and off of the switch in the switch unit.