Battery discharge system

Abstract

The utility model discloses a battery discharging system which comprises at least one DC / DC module used for being connected with a to-be-discharged battery, an AC / DC module connected with the DC / DC module and an isolation transformer connected with the AC / DC module and used for being connected with a power grid, the DC / DC module is used for conducting DC / DC conversion on direct current output by the to-be-discharged battery, and the AC / DC module is used for conducting DC / DC conversion on direct current output by the to-be-discharged battery. The AC / DC module is used for converting the direct current output by the DC / DC module into alternating current; and the isolation transformer is used for sending the alternating current into a power grid. According to the technical scheme disclosed by the invention, the DC / DC module, the AC / DC module and the isolation transformer are utilized to realize grid-connected recycling of the complementary energy of the battery to be discharged, so that the waste of the complementary energy of the battery is reduced, the utilization rate of the complementary energy of the battery is improved, the potential safety hazard of subsequent treatment of the battery is reduced, and the safety of battery recycling is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery recycling, and in particular to a battery discharging system. Background Art

[0002] In recent years, with the rapid rise of the new energy vehicle industry, a large number of waste power batteries will be generated. The recycling of waste power batteries not only solves the environmental pollution caused by battery disposal, but also brings huge economic value and is of great significance. After the power battery is retired, there is still residual power, which poses a great safety hazard in the transportation, storage and comprehensive treatment process. In order to facilitate the comprehensive recycling of waste power batteries safely and efficiently, the waste power batteries need to be discharged before recycling.

[0003] At present, when discharging used power batteries, the batteries are connected to resistors, and the residual energy of the batteries is consumed in the form of heat through the resistors. This method will lead to waste of residual energy in the batteries.

[0004] In summary, how to reduce the waste of residual battery energy is a technical problem that needs to be urgently solved by those skilled in the art. Utility Model Content

[0005] In view of this, an object of the present application is to provide a battery discharge system for reducing the waste of residual battery energy.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A battery discharge system comprises at least one DC / DC module connected to a battery to be discharged, an AC / DC module connected to the DC / DC module, and an isolation transformer connected to the AC / DC module and connected to a power grid, wherein: the DC / DC module is used to perform DC / DC conversion on the direct current output by the battery to be discharged; the AC / DC module is used to convert the direct current output by the DC / DC module into alternating current; and the isolation transformer is used to send the alternating current into the power grid.

[0008] Optionally, it further includes: a first detection module arranged between the DC / DC module and the battery to be discharged, used for detecting the DC voltage and / or DC current output by the battery to be discharged; a second detection module arranged between the DC / DC module and the AC / DC module, used for detecting the DC bus voltage and / or DC bus current on the DC input terminal of the AC / DC module; and a first switch element connected between the DC / DC module and the battery to be discharged, used for shutting down when the DC voltage and / or DC current output by the battery to be discharged is not within a corresponding first preset range, or when the DC bus voltage and / or DC bus current on the DC input terminal of the AC / DC module is not within a corresponding second preset range, so as to disconnect the DC / DC module from the battery to be discharged.

[0009] Optionally, it further includes a first control module connected to the first detection module, the second detection module and the first switch element, for acquiring data detected by the first detection module and the second detection module, and for controlling the on and off of the first switch element.

[0010] Optionally, the device further comprises a filtering and voltage stabilizing module disposed between the DC / DC module and the battery to be discharged, for filtering and stabilizing the direct current output by the battery to be discharged.

[0011] Optionally, it further includes an anti-electromagnetic interference module arranged between the DC / DC module and the battery to be discharged.

[0012] Optionally, it also includes: a third detection module arranged between the AC / DC module and the isolation transformer, used to detect the AC voltage and / or AC current output by the AC / DC module; a second switching element connected between the AC / DC module and the isolation transformer, used to shut down when the AC voltage and / or AC current output by the AC / DC module is not within a corresponding third preset range, so as to disconnect the connection between the AC / DC module and the isolation transformer.

[0013] Optionally, a second control module connected to the third detection module and the second switch element is further included, which is used to obtain data detected by the third detection module and to control the on and off of the second switch element.

[0014] Optionally, a filter module is further included, which is arranged between the AC / DC module and the isolation transformer, and is used to filter the alternating current output by the AC / DC module.

[0015] Optionally, the system further includes a first air switch disposed between the AC / DC module and the isolation transformer, and a second air switch disposed between the isolation transformer and the power grid.

[0016] Optionally, a fan system is further included, and a power supply of the fan system is connected to the AC output terminal of the AC / DC module.

[0017] The present application provides a battery discharge system, comprising at least one DC / DC module connected to a battery to be discharged, an AC / DC module connected to the DC / DC module, and an isolation transformer connected to the AC / DC module and connected to a power grid, wherein: the DC / DC module is used to perform DC / DC conversion on the direct current output by the battery to be discharged; the AC / DC module is used to convert the direct current output by the DC / DC module into alternating current; and the isolation transformer is used to send the alternating current into the power grid.

[0018] The above technical solution disclosed in the present application is provided with at least one DC / DC module connected to the battery to be discharged, an AC / DC module connected to the DC / DC module, and an isolation transformer connected to the AC / DC module and connected to the power grid. The DC / DC module is used to convert the DC power output by the battery to be discharged into DC / DC, the AC / DC module is used to convert the DC power output by the DC / DC module into AC power, and the isolation transformer is used to isolate and stabilize the voltage, and then the AC power is sent to the power grid by the isolation transformer, so as to realize the grid-connected recycling of the residual energy of the battery to be discharged, thereby reducing the waste of the residual energy of the battery, improving the utilization rate of the residual energy of the battery, reducing the safety hazards of the subsequent processing of the battery, and improving the safety of battery recycling.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a battery discharge system provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a DC / DC power cabinet in a battery discharging system provided in an embodiment of the present application at one viewing angle;

[0022] Figure 3 A schematic diagram of a DC / DC power cabinet in a battery discharge system provided in an embodiment of the present application from another perspective;

[0023] Figure 4 A schematic diagram of a DC / DC power cabinet in a battery discharging system provided in an embodiment of the present application from another perspective;

[0024] Figure 5 A side view of an inverter feedback cabinet in a battery discharge system provided in an embodiment of the present application;

[0025] Figure 6 A schematic diagram of connecting a battery to be discharged to a DC / DC module provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the connection between the AC / DC module and the isolation transformer provided in an embodiment of the present application.

[0027] The reference numerals are as follows:

[0028] 100-battery to be discharged, 200-grid;

[0029] 1-DC / DC module, 11-IGBT power module, 12-IGBT driver board, 13-output capacitor group module, 14-auxiliary power supply isolation transformer, 15-auxiliary power board, 2-AC / DC module, 3-isolation transformer, 4-Hall sensor, 5-first switch element, 51-positive relay, 52-negative relay, 6-first control module, 7-filter voltage regulator module, 71-magnetic ring, 72-capacitor, 73-DC / DC inductor, 8-fuse, 9-anti-electromagnetic interference module, 91-bus capacitor module, 10-second switch element, 20-second control module, 30-filter module, 301-filter inductor, 302-filter capacitor, 40-first air switch, 50-second air switch, 60-fan, 601-main fan, 602-auxiliary fan, 61-fan start capacitor, 62-fan speed regulating transformer. DETAILED DESCRIPTION

[0030] In recent years, with the rapid rise of the new energy vehicle industry, a large number of waste power batteries will be generated. The recycling of waste lithium batteries and other waste power batteries can not only solve the environmental pollution caused by battery disposal, but also bring huge economic value, which is of great significance. After the power battery is retired, there is still residual power, which poses a great safety hazard during transportation, storage and comprehensive treatment (such as disassembly, crushing, etc.). In order to facilitate the safe and efficient comprehensive recycling of waste power batteries, discharge treatment should be carried out before recycling.

[0031] At present, when discharging used power batteries, the batteries are connected to resistors, and the residual energy of the batteries is consumed in the form of heat through the resistors. This method will lead to waste of residual energy in the batteries.

[0032] To this end, the present application provides a battery discharge system for reducing the waste of battery residual energy and improving the utilization rate of battery residual energy.

[0033] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0034] See also Figures 1 to 5 ,in, Figure 1 A schematic diagram of the structure of a battery discharge system provided in an embodiment of the present application is shown. Figure 2 A schematic diagram of a DC / DC power cabinet in a battery discharging system provided in an embodiment of the present application at a viewing angle is shown. Figure 3 A schematic diagram of a DC / DC power cabinet in a battery discharging system provided in an embodiment of the present application from another perspective is shown. Figure 4 A schematic diagram of a DC / DC power cabinet in a battery discharging system provided in an embodiment of the present application from another perspective is shown. Figure 5 A side view of an inverter feedback cabinet in a battery discharge system provided in an embodiment of the present application. A battery discharge system provided in an embodiment of the present application may include at least one DC / DC module 1 connected to a battery to be discharged 100, an AC / DC module 2 connected to the DC / DC module 1, and an isolation transformer 3 connected to the AC / DC module 2 and connected to a power grid 200, wherein:

[0035] A DC / DC module 1, used for performing DC / DC conversion on the direct current outputted by the battery 100 to be discharged;

[0036] AC / DC module 2, used for converting the direct current output by the DC / DC module 1 into alternating current;

[0037] The isolation transformer 3 is used to send the alternating current into the power grid 200 .

[0038] The battery discharge system provided in the embodiment of the present application may include at least one DC / DC (direct current / direct current) module 1 , an AC / DC (alternating current / direct current) module 2 and an isolation transformer 3 .

[0039] The number of DC / DC modules 1 can be set as needed, for example, 10 or 16. Each DC / DC module 1 is used to connect to a battery to be discharged 100, wherein the positive and negative electrodes of the battery to be discharged 100 can be connected to the corresponding input terminals of the DC / DC module 1 (specifically, the positive and negative electrodes of the battery to be discharged 100 are connected to the positive and negative input terminals of the DC / DC module 1), so as to use the DC / DC module 1 to perform DC / DC conversion on the DC power output by the battery to be discharged 100. Specifically, the DC / DC module 1 can be used to perform DC boost on the DC power output by the battery to be discharged 100 (that is, the DC / DC module 1 can be specifically a DC / DC boost module). For example, the voltage of the DC power output by the battery to be discharged 100 is 200V to 500V, and the DC / DC module 1 can boost the 200V to 500V output by the battery to be discharged 100 to 800V. It should be noted that the battery to be discharged 100 mentioned above may refer to a waste power battery, specifically a waste lithium-ion battery. Of course, it may also be other waste batteries as long as there is residual power. In addition, the DC / DC module 1 is a DC / DC converter. The DC / DC module 1 may include an IGBT (insulated gate bipolar transistor) power module 11, an IGBT driver board 12, an output capacitor 72 group module 13, an auxiliary power supply isolation transformer 14, an auxiliary power supply board 15, etc., wherein the IGBT power module 22 and the IGBT driver board 12 are used for frequency conversion, the output capacitor group module 13 plays the role of filtering, voltage stabilization and noise reduction, and the auxiliary power supply isolation transformer 14 and the auxiliary power supply board 15 are used for the control and protection of high-voltage circuits.

[0040] When there are multiple DC / DC modules 1, these DC / DC modules 1 are connected in parallel, and each DC / DC module 1 forms a discharge channel, and each discharge channel can discharge at the same time. Specifically, the input end of each DC / DC module 1 is connected to the corresponding battery 100 to be discharged, and the output end of each DC / DC module 1 is collected together and connected to the DC input end of the AC / DC module 2. Multiple discharge channels collect the currents of each branch and perform DC / DC conversion before transmitting them to the AC / DC module 2. Among them, connecting each DC / DC module 1 in parallel can realize modular design, so that each discharge channel can discharge independently, so that when a discharge channel fails and needs maintenance, only the discharge channel with the failure can be repaired, and the battery discharge system does not need to be shut down for maintenance. Other discharge channels can still be used normally, so as to shorten the maintenance time, reduce the maintenance cost, and reduce the impact of maintenance on the entire battery discharge system, and improve the discharge efficiency of the battery 100 to be discharged.

[0041] The AC / DC module 2 is connected to the DC / DC module 1, wherein when there are multiple DC / DC modules 1 connected in parallel in the battery discharge system, the AC / DC module 2 can be connected to the output end of the parallel DC / DC module 1, that is, the DC power output by all DC / DC modules is collected through the DC bus and then sent to the AC / DC module. The AC / DC module 2 is used to convert the DC power output by the DC / DC module 1 into AC power, and specifically, the DC power output by the DC / DC module 1 can be converted into AC power according to the requirements of the power grid 200 for AC power, so as to meet the requirements of the power grid 200. For example, when the AC power in the power grid 200 is 380V, the AC / DC module 2 can convert the DC power output by the DC / DC module 1 into AC power of about 380V or 400V, that is, the AC / DC module 2 is used to convert DC power to AC power and provide a stable voltage. Among them, the AC / DC module 2 is a three-phase AC / DC module, which is specifically an AC / DC inverter. The AC / DC module 2 can provide a stable DC bus voltage to ensure that the grid 200PF (power factor) value is above 0.98, and can realize the grid-connected inverter function when the battery 100 to be discharged is discharged, ensuring that the feedback energy meets the requirements of the national grid.

[0042] The AC / DC module 2 is connected to the isolation transformer 3 (specifically, the AC output end of the AC / DC module 2 is connected to the input end of the isolation transformer 3), and the output end of the isolation transformer 3 is connected to the power grid 200 (specifically, it can be connected with the 380V three-phase power of the power grid 200). The AC power converted by the AC / DC module 2 is sent to the power grid 200 through the isolation transformer 3, that is, the AC power converted by the AC / DC module 2 can be sent to the isolation transformer 3, and the isolation transformer 3 processes the AC power converted by the AC / DC module 2, and then sends the processed AC power to the power grid 200. Among them, the isolation transformer 3 can play the role of isolation, voltage transformation (transformation to 380V), voltage stabilization, etc., so that the AC power sent to the power grid 200 can be stabilized at 380V, that is, the isolation transformer 3 is used to realize the access of electric energy to the power grid 200, stabilize the AC voltage to 380V and feed it back to the power grid 200. By setting the isolation transformer 3, the quality of electric energy to be sent to the power grid 200 by the battery discharge system can be improved. Among them, the isolation transformer 3 included in the battery discharge system provided in the embodiment of the present application is also called an industrial frequency transformer.

[0043] The battery discharge system further includes a grounding branch that can be connected to a branch between the AC output end of the AC / DC module 2 and the input end of the isolation transformer 3. The first end of the grounding branch is connected to the branch between the AC output end of the AC / DC module 2 and the input end of the isolation transformer 3, and the second end is grounded to play a protective role. The aforementioned grounding branch can specifically include a switch and a capacitor 72. Of course, the aforementioned grounding branch can also be a wire.

[0044] It should be noted that the battery discharge system provided in the embodiment of the present application can be placed in a cabinet to form a battery discharge cabinet. The cabinet can include multiple placement grids, and the components in the battery discharge system can be placed in different placement grids. The battery discharge cabinet can be divided into two parts: a DC / DC power cabinet and an inverter feedback cabinet. Figure 2-Figure 5 As shown. The DC / DC power cabinet may include a DC / DC module 1, etc., which mainly realizes the control and adjustment of relevant parameters such as the current, voltage and power flow between the DC bus and the battery to be discharged 100, so as to meet the test requirements of the battery to be discharged 100 under various complex working conditions such as static and discharge. Among them, the discharge channel in the DC / DC power cabinet completes the discharge control of the battery to be discharged and realizes the constant current and constant voltage discharge function. The inverter feedback cabinet is connected to the 380V three-phase electricity of the power grid 200. The inverter feedback cabinet may include an AC / DC module 2, an isolation transformer 3, etc., which mainly realizes inversion and sends the surplus energy of the battery to be discharged 100 to the power grid 200. Among them, the inverter feedback cabinet can be divided into two parts: an AC / DC power cabinet and a transformer cabinet. The transformer cabinet may include an isolation transformer 3, etc., and the AC / DC power cabinet may include an AC / DC module 2, etc.

[0045] From the above, it can be known that the battery discharge system provided by the embodiment of the present application can be used to feed back the surplus energy in the battery to be discharged 100 to the grid while discharging the battery to be discharged 100, and the recovered electric energy can be uploaded to the power grid 200 to reduce the waste of the surplus energy of the battery to be discharged 100 and improve the utilization of the surplus energy of the battery to be discharged 100. That is, the battery discharge system provided by the embodiment of the present application can not only discharge the waste batteries to reduce the safety hazards in the subsequent transportation, storage and comprehensive treatment of the waste batteries, so as to provide protection for the subsequent treatment processes such as module and battery pack, but also recycle the remaining energy in the waste batteries to improve the utilization rate of the residual electricity in the waste batteries.

[0046] The above technical solution disclosed in the embodiment of the present application is provided with at least one DC / DC module 1 connected to the battery to be discharged 100, an AC / DC module 2 connected to the DC / DC module 1, and an isolation transformer 3 connected to the AC / DC module 2 and connected to the power grid 200. The DC / DC module 1 is used to perform DC / DC conversion on the DC power output by the battery to be discharged 100, the AC / DC module 2 is used to convert the DC power output by the DC / DC module 1 into AC power, and the isolation transformer 3 is used to perform isolation and voltage stabilization, and then the AC power is sent to the power grid 200 by the isolation transformer 3, so as to realize the grid-connected recycling of the surplus energy of the battery to be discharged 100, thereby reducing the waste of the surplus energy of the battery, improving the utilization rate of the surplus energy of the battery, reducing the safety hazards of the subsequent treatment of the battery, and improving the safety of battery recycling.

[0047] See also Figure 6 and Figure 7 ,in, Figure 6 The figure shows a schematic diagram of connecting a battery to be discharged to a DC / DC module provided in an embodiment of the present application. Figure 7 A schematic diagram of the connection between the AC / DC module and the isolation transformer provided in an embodiment of the present application is shown. A battery discharge system provided in an embodiment of the present application may also include:

[0048] A first detection module provided between the DC / DC module 1 and the battery to be discharged 100, for detecting the DC voltage and / or DC current output by the battery to be discharged 100;

[0049] A second detection module provided between the DC / DC module 1 and the AC / DC module 2, for detecting a DC bus voltage and / or a DC bus current on a DC input terminal of the AC / DC module 2;

[0050] The first switch element 5 connected between the DC / DC module 1 and the battery to be discharged 100 is used to shut down when the DC voltage and / or DC current output by the battery to be discharged 100 is not within the corresponding first preset range, or when the DC bus voltage and / or DC bus current at the DC input end of the AC / DC module 2 is not within the corresponding second preset range, so as to disconnect the DC / DC module 1 from the battery to be discharged 100.

[0051] In the embodiment of the present application, the battery discharge system may further include a first detection module, a second detection module, and a first switch element 5 connected to the first detection module and the second detection module. Both the first detection module and the second detection module may be a voltage and current tester, a Hall sensor 4 (which may detect magnetic field changes caused by current, a protection circuit), etc., for detecting the corresponding voltage and / or current, wherein when it is necessary to detect the voltage and current, both the first detection module and the second detection module may be a sensor with voltage detection capability and current detection capability, or may include two sensors: one is a voltage sensor for voltage detection, and the other is a current sensor for current detection. When it is necessary to detect the voltage or current, the first detection module and the second detection module may be sensors with the capability of detecting the corresponding parameters. The first switch element 5 may specifically include a positive relay 51 arranged on the positive branch (i.e., the branch where the positive pole of the battery 100 to be discharged is connected to the positive pole of the DC / DC module 1) and a negative relay 52 arranged on the negative branch (i.e., the branch where the negative pole of the battery 100 to be discharged is connected to the negative pole of the DC / DC module 1). Of course, the first switch element 5 may also be other switch elements with on-off capability.

[0052] The first detection module may be arranged between the DC / DC module 1 and the battery to be discharged 100, and may be arranged on the branch connecting the DC / DC module 1 and the battery to be discharged 100 and may be close to the battery to be discharged 100, for detecting the DC voltage and / or DC current output by the battery to be discharged 100. The second detection device may be arranged between the DC / DC module 1 and the AC / DC module 2, and may be arranged on the branch connecting the DC / DC module 1 and the AC / DC module 2 and may be close to the AC / DC module 2, for detecting the DC bus voltage and / or DC bus current on the DC input end of the AC / DC module 2, and the second detection device may be arranged on the DC bus at the input end of the AC / DC module 2 to detect the voltage and / or current on the DC bus. The first switch element 5 is used to shut down when the DC voltage and / or DC current output by the battery to be discharged 100 detected by the first detection module is not within the corresponding first preset range (i.e., the DC voltage output by the battery to be discharged 100 has a corresponding first preset DC voltage range, and the DC current output by the battery to be discharged 100 has a corresponding first preset DC current range), or shut down when the DC bus voltage and / or DC bus current on the DC input end of the AC / DC module 2 detected by the second detection module is not within the corresponding second preset range (i.e., the DC bus voltage has a corresponding second preset DC bus voltage range, and the DC bus current has a corresponding second preset DC bus current range), so as to disconnect the DC / DC module 1 from the battery to be discharged 100, thereby ensuring the quality of the power that the surplus energy of the battery to be discharged 100 is inverted and fed back to the grid. Among them, the first preset range corresponding to the DC voltage and / or DC current output by the battery to be discharged 100, and the second preset range corresponding to the DC bus voltage and / or DC bus current on the DC input end of the AC / DC module 2 can be set according to the grid demand, etc.

[0053] Exemplarily, the above specific implementation process may be: the relevant personnel obtain the DC voltage and / or DC current output by the battery to be discharged 100 detected by the first detection device, the DC bus voltage and / or DC bus current on the DC input terminal of the AC / DC module 2 detected by the second detection device, and may compare the DC voltage and / or DC current output by the battery to be discharged 100 detected by the first detection device with the corresponding first preset range, and compare the DC bus voltage and / or DC bus current on the DC input terminal of the AC / DC module 2 detected by the second detection device with the corresponding second preset range. When it is determined that the DC voltage and / or DC current output by the battery to be discharged 100 detected by the first detection device is not within the corresponding first preset range, or when it is determined that the DC bus voltage and / or DC bus current on the DC input terminal of the AC / DC module 2 detected by the second detection device is not within the corresponding second preset range, the first switch element 5 may be controlled to be turned off, thereby disconnecting the connection between the DC / DC module 1 and the battery to be discharged 100. When the DC voltage and / or DC current output by the battery to be discharged 100 detected by the first detection device is within the corresponding first preset range, and when the DC bus voltage and / or DC bus current on the DC input end of the AC / DC module 2 detected by the second detection device is within the corresponding second preset range, the first switch element 5 can be kept closed to keep the DC / DC module 1 connected to the battery to be discharged 100, thereby realizing the discharge of the battery to be discharged 100 and sending the discharged energy of the battery to be discharged 100 to the power grid 200 through inverter feedback. Of course, the first switch element 5 can also be controlled to be on and off in other ways.

[0054] A battery discharge system provided in an embodiment of the present application may further include a first control module 6 connected to the first detection module, the second detection module and the first switch element 5, for obtaining data detected by the first detection module and the second detection module, and for controlling the on and off of the first switch element 5.

[0055] In the embodiment of the present application, the battery discharge system may further include a first control module 6 connected to the first detection module, the second detection module and the first switch element 5. The first control module 6 may specifically be a controller, a single chip microcomputer and the like.

[0056] The first control module 6 can obtain the data detected by the first detection module and the data detected by the second detection module, and can control the first switch element 5 to be turned off when the DC voltage and / or DC current output by the battery to be discharged 100 detected by the first detection device is not within the corresponding first preset range, or when the DC bus voltage and / or DC bus current on the DC input end of the AC / DC module 2 detected by the second detection device is not within the corresponding second preset range; when the DC voltage and / or DC current output by the battery to be discharged 100 detected by the first detection device is within the corresponding first preset range, and when the DC bus voltage and / or DC bus current on the DC input end of the AC / DC module 2 detected by the second detection device is within the corresponding second preset range, the first switch element 5 is controlled to remain closed.

[0057] The first control module 6 may include a comparator, etc., to compare whether the DC voltage and / or DC current output by the battery to be discharged 100 detected by the first detection device is within the corresponding first preset range, and whether the DC bus voltage and / or DC bus current on the DC input end of the AC / DC module 2 detected by the second detection device is within the corresponding second preset range, and can output a control signal according to the comparison result to control the on-off of the first switch element 5. Of course, the battery discharge system may also include a host computer connected to the first control module 6, and the first control module 6 may send the acquired data detected by the first detection module and the data detected by the second detection module to the host computer, and the host computer compares and determines whether the DC voltage and / or DC current output by the battery to be discharged 100 detected by the first detection device is within the corresponding first preset range, and whether the DC bus voltage and / or DC bus current on the DC input end of the AC / DC module 2 detected by the second detection device is within the corresponding second preset range, and sends a control signal to the first control module 6 according to the comparison result, and the first control module controls the on-off of the first switch element 5. In the case of including a host computer, after the battery discharge system is connected to the battery to be discharged 100, the host computer can first control the first switch element 5 to close so that the battery to be discharged 100 is discharged, and the data detected by the first detection module and the data detected by the second detection module can be obtained through the first control module 6 during the discharge process of the battery to be discharged 100, so as to monitor the current, voltage, discharge capacity, discharge power, etc. during the discharge process of the battery to be discharged 100, and perform the above process. Wherein, if the host computer determines that the DC voltage and / or DC current output by the battery to be discharged 100 detected by the first detection device is not within the corresponding first preset range, or determines that the DC bus voltage and / or DC bus current on the DC input end of the AC / DC module 2 detected by the second detection device is not within the corresponding second preset range, in addition to controlling the first switch element 5, an alarm can also be performed, so that relevant personnel can obtain relevant information in time and take corresponding measures. In addition, after acquiring the data detected by the first detection module and the data detected by the second detection module, the host computer can generate data curves corresponding to various types of data according to the acquired data and the corresponding time (the horizontal axis can be time, and the vertical axis can be the corresponding data detected by the first detection module and the second detection module), and can display each data curve, so that relevant personnel can obtain the discharge status of the battery to be discharged 100 through the displayed data curve. Of course, after acquiring the data detected by the first detection module and the second detection module, the host computer can also directly display the data detected by the first detection module and the second detection module.

[0058] A battery discharging system provided in an embodiment of the present application may further include a filtering and voltage stabilizing module 7 disposed between the DC / DC module 1 and the battery to be discharged 100, for filtering and stabilizing the direct current output by the battery to be discharged 100.

[0059] In the embodiment of the present application, the battery discharge system may further include a filter and voltage regulator module 7 disposed between the DC / DC module 1 and the battery to be discharged 100. The DC power output by the battery to be discharged 100 is first filtered and voltage-regulated by the filter and voltage regulator module 7, and the filtered and voltage-regulated DC power is input into the DC / DC module 1, and the DC / DC conversion is performed by the DC / DC module 1. By disposing the filter and voltage regulator module 7 between the DC / DC module 1 and the battery to be discharged 100, the quality of the DC power output by the battery to be discharged 100 can be improved.

[0060] The filter and voltage stabilizing module 7 may specifically include a magnetic ring 71 disposed on the positive branch between the DC / DC module 1 and the battery to be discharged 100, a capacitor 62 having one end connected to the positive branch between the DC / DC module 1 and the battery to be discharged 100 and the other end connected to the negative branch between the DC / DC module 1 and the battery to be discharged 100, and a DC / DC inductor 73 disposed on the positive branch between the DC / DC module 1 and the battery to be discharged 100. Based on the foregoing, a fourth detection module may be provided to detect the capacitor voltage of the capacitor 62 in the filter and voltage stabilizing module 7 so as to obtain information about the capacitor 62 in the filter and voltage stabilizing module 7.

[0061] In addition, the battery discharge system may further include a fuse 8 disposed between the DC / DC module 1 and the battery to be discharged 100. Specifically, the fuse 8 may be disposed on the positive branch between the DC / DC module 1 and the battery to be discharged 100 to provide overload protection.

[0062] A battery discharging system provided in an embodiment of the present application may further include an electromagnetic interference protection module 9 disposed between the DC / DC module 1 and the battery to be discharged 100 .

[0063] In addition, the battery discharge system may further include an anti-electromagnetic interference module 9 arranged between the DC / DC module 1 and the battery to be discharged 100, wherein one end of the anti-electromagnetic interference module 9 may be connected to the positive branch between the DC / DC module 1 and the battery to be discharged 100, and the other end may be connected to the negative branch between the DC / DC module 1 and the battery to be discharged 100, so as to reduce the electromagnetic interference intensity between the internal components of the battery discharge system and the internal components to the external environment.

[0064] The anti-electromagnetic interference module 9 may specifically be an EMI (electromagnetic interference) board, and the EMI board may include a bus capacitor module 91 for introducing harmonic current into the bus capacitor module 91 to reduce the harmonic current.

[0065] A battery discharging system provided in an embodiment of the present application may further include:

[0066] A third detection module provided between the AC / DC module 2 and the isolation transformer 3, for detecting the AC voltage and / or AC current output by the AC / DC module 2;

[0067] The second switch element 10 connected between the AC / DC module 2 and the isolation transformer 3 is used to shut down when the AC voltage and / or AC current output by the AC / DC module 2 is not within the corresponding third preset range, so as to disconnect the connection between the AC / DC module 2 and the isolation transformer 3.

[0068] In the embodiment of the present application, the battery discharge system may further include a third detection module and a second switch element 10. The third detection module may be a voltage and current tester, a Hall sensor, etc., for detecting the corresponding voltage and / or current, wherein when the voltage and current need to be detected, the third detection module may be a sensor with voltage detection capability and current detection capability, or may include two sensors: one is a voltage sensor for voltage detection, and the other is a current sensor for current detection. When the voltage or current needs to be detected, the third detection module may be a sensor with the ability to detect the corresponding parameters. The second switch element 10 may specifically be a grid-connected contactor, and of course, may also be other switch elements with on-off capabilities.

[0069] The third detection module can be arranged between the AC / DC module 2 and the isolation transformer 3, and is used to detect the AC voltage and / or AC current output by the AC / DC module 2. The third switch element can be arranged between the AC / DC module 2 and the isolation transformer 3, and is used to shut down when the AC voltage and / or AC current output by the AC / DC module 2 detected by the third detection module is not within the corresponding third preset range (i.e., the AC voltage output by the AC / DC module 2 has a corresponding third preset AC voltage range, and the AC current output by the AC / DC module 2 has a corresponding third preset AC current range), so as to disconnect the connection between the AC / DC module 2 and the isolation transformer 3, thereby ensuring the quality of the electric energy that the remaining energy of the battery 100 to be discharged can be inverted and fed back to the grid. Among them, the third preset range corresponding to the AC voltage and / or AC current output by the AC / DC module 2 can be specifically set according to the grid demand, etc.

[0070] Exemplarily, the above implementation process may be: the relevant personnel obtain the AC voltage and / or AC current output by the AC / DC module 2 detected by the third detection device, compare the AC voltage and / or AC current output by the AC / DC module 2 obtained by the third detection module with the corresponding third preset range, if the AC voltage and / or AC current output by the AC / DC module 2 is not within the corresponding third preset range, then control the second switch element 10 to be turned off to disconnect the connection between the AC / DC module 2 and the isolation transformer 3, if the AC voltage and / or AC current output by the AC / DC module 2 is within the corresponding third preset range, then keep the second switch element 10 closed, so that the AC / DC module 2 is connected to the isolation transformer 3, so as to discharge the battery 100 to be discharged and send the discharged energy of the battery 100 to be discharged to the power grid 200 through inverter feedback. Of course, the second switch element 10 may also be controlled to be turned on and off in other ways.

[0071] A battery discharging system provided in an embodiment of the present application may further include a second control module 20 connected to the third detection module and the second switch element 10 , for acquiring data detected by the third detection module and for controlling the on and off of the second switch element 10 .

[0072] The battery discharge system may further include a second control module 20 connected to the third detection module and the second switch element 10, and the second control module 20 may be a DSP (digital signal processing) control board, a controller, a single chip microcomputer, etc. The second control module 20 is used to obtain the AC voltage and / or AC current output by the AC / DC module 2 detected by the third detection module, and compare the AC voltage and / or AC current output by the AC / DC module 2 detected by the third detection module with the corresponding third preset range, and control the second switch element 10 to be turned off if it is determined that the AC voltage and / or AC current output by the AC / DC module 2 is not within the corresponding third preset range, and keep the second switch element 10 closed if it is determined that the AC voltage and / or AC current output by the AC / DC module 2 is within the corresponding third preset range.

[0073] The second control module 20 may include a comparator, etc., to compare whether the AC voltage and / or AC current output by the AC / DC module 2 detected by the third detection module is within the corresponding third preset range, and the second switch element 10 may be controlled to be turned on and off according to the comparison result. Of course, the battery discharge system may also include a host computer connected to the second control module 20, and the second control module 20 may send the AC voltage and / or AC current output by the AC / DC module 2 detected by the third detection module to the host computer, and the host computer determines whether the AC voltage and / or AC current output by the AC / DC module 2 detected by the third detection module is within the corresponding third preset range, and sends a control signal to the second control module 20 according to the result, and the second control module 20 controls the on and off of the first switch element 5. When the host computer determines that the AC voltage and / or AC current output by the AC / DC module 2 detected by the third detection module is not within the corresponding third preset range, in addition to controlling the second switch element 10, it may also issue an alarm, etc., so that relevant personnel can obtain relevant information in time and take corresponding measures. In addition, after obtaining the AC voltage and / or AC current output by the AC / DC module 2 detected by the third detection module, the upper computer can also generate a corresponding data curve based on the AC voltage and / or AC current output by the AC / DC module 2 detected by the third detection module and the corresponding time, and can display the generated data curve so that relevant personnel can obtain the inversion condition of the discharge of the battery 100 to be discharged through the displayed data curve.

[0074] A battery discharge system provided in an embodiment of the present application may further include a filter module 30 disposed between the AC / DC module 2 and the isolation transformer 3 , for filtering the alternating current output by the AC / DC module 2 .

[0075] In the embodiment of the present application, the battery discharge system may further include a filter module 30 disposed between the AC / DC module 2 and the isolation transformer 3, and the filter module 30 is used to filter the alternating current output by the AC / DC module 2, that is, the alternating current output by the AC / DC module 2 is first filtered by the filter module 30, and then the filtered alternating current is sent to the power grid 200 through the isolation transformer 3. By arranging the filter module 30 between the AC / DC module 2 and the isolation transformer 3, the quality of the alternating current sent by the battery discharge system to the power grid 200 can be improved.

[0076] The filter module 30 may specifically include a filter inductor 301 having a first end connected to the AC output end of the AC / DC module 2 and a second end connected to the input end of the isolation transformer 3, and a filter capacitor 302 connected to the second end of the filter inductor 301, wherein the filter capacitor 302 may specifically be three capacitors connected in a triangle. On the basis of the above, after the battery discharge system starts working, the filter capacitor 302 needs to be charged to the required voltage before it can work. In order to detect the influence of the filter capacitor 302 on the battery discharge system, a fifth detection module may also be provided to detect the current of the filter capacitor 302.

[0077] On the basis of the above, a sixth detection module may be provided between the isolation transformer and the filter module, for detecting the grid voltage and / or grid current, and when the grid voltage and / or grid current are not within the corresponding fourth preset range, the second switch may be turned off (wherein the sixth detection module may be connected to the second control module) to disconnect the discharge process of the battery to be discharged 100. Moreover, after disconnecting the discharge process of the battery to be discharged 100, if some components in the battery discharge system need electricity, electricity may be taken from the grid 200 through the isolation transformer, and at this time, the sixth detection module may be used to detect the grid voltage and / or grid current.

[0078] A battery discharge system provided in an embodiment of the present application may further include a first air switch 40 arranged between the AC / DC module 2 and the isolation transformer 3, and a second air switch 50 arranged between the isolation transformer 3 and the power grid 200.

[0079] In the embodiment of the present application, the battery discharge system may further include a first air switch 40 and a second air switch 50. The first air switch 40 is disposed between the AC / DC module 2 and the isolation transformer 3 to control the on / off status of the connection between the isolation transformer 3 and the AC / DC module 2. Figure 7 As shown, if a filter module 30 is provided between the AC / DC module 2 and the isolation transformer 3 , the first air switch 40 may be provided between the output end of the filter module 30 and the isolation transformer 3 .

[0080] The second air switch 50 is arranged between the isolation transformer 3 and the power grid 200, and is the main switch of the battery discharge system, and is used to control the on-off status of the power grid 200 and the battery discharge system to protect the battery discharge system.

[0081] A battery discharge system provided in an embodiment of the present application may further include a fan system, and a power supply of the fan system is connected to the AC output end of the AC / DC module 2.

[0082] In the embodiment of the present application, the battery discharge system may further include a fan system, the power supply of the fan system may be connected to the AC output terminal of the AC / DC module 2, that is, the power supply of the fan system may be connected between the isolation transformer 3 and the AC / DC module 2 to obtain power from the AC power converted by the AC / DC module 2. Among them, a first transformer may be included between the power supply of the fan system and the AC output terminal of the AC / DC module 2, so that the AC power obtained from the AC / DC module 2 can better meet the power demand of the fan system by using the first transformer, and the first transformer may be connected to the AC output terminal of the AC / DC module 2 through a switch. It should be noted that when the filter module 30 and the first air switch 40 are provided between the AC / DC module 2 and the isolation transformer 3, the power supply of the fan system can be connected to the second end of the first air switch 40 (the first end of the first air switch 40 is connected to the output end of the filter module 30), so as to improve the quality of power acquisition when the battery 100 to be discharged is discharged. When the discharge of the battery 100 to be discharged is disconnected, if the fan system needs to work, the power supply of the fan system can obtain power from the power grid 200 through the isolation transformer 3 to work. The fan system can specifically include a fan 60 (the fan 60 can be divided into a main fan 601 and an auxiliary fan 602), a fan starting capacitor 61, a fan speed regulating transformer 62, etc. The fan system is used to ventilate and dissipate heat for the components in the battery discharge system, thereby improving the reliability of the battery discharge system.

[0083] In addition, other auxiliary power supplies in the battery discharge system can also be connected to the AC output end of the AC / DC module 2 (wherein the connection position of other auxiliary power supplies in the battery discharge system is the same as the connection position of the power supply of the fan system) to obtain power from the AC power converted by the AC / DC module 2, and a second transformer can be included between the other auxiliary power supplies and the AC / DC module 2, so that the AC power obtained from the AC / DC module 2 can better meet the power demand of other auxiliary devices by using the second transformer, wherein the second transformer can also be connected to the second end of the first air switch 40 through a switch. Moreover, the electrical equipment in the factory can also be connected to the AC output end of the AC / DC module 2 through a third transformer (wherein a switch can also be provided), so as to use the AC power obtained after the residual energy of the battery 100 to be discharged is recovered and inverted to power the electrical equipment in the factory.

[0084] Through the above, it can be achieved that the excess energy of the battery 100 to be discharged is recovered by inversion to give priority to meeting the power demand of the power supply in the battery discharge system and the power demand of the factory where the battery discharge system is located. The excess AC power can be uploaded to the power grid 200 through the isolation transformer 3 to obtain benefits, reduce the waste of electricity, and improve the utilization rate of electricity.

[0085] In order to verify that the battery discharge system provided by this application has a good technical effect, a discharge-feedback experiment was carried out on a certain battery pack using the battery discharge system provided by this application. Measurements before the experiment found that the voltage of a single cell in the battery pack was 3.75V and the total voltage was 313V, and a staged constant current discharge and constant voltage discharge lasted for 149 minutes. After 149 minutes, the total voltage dropped to 83V, and the accumulated feedback residual energy reached 22.3KWh. The experiment fully proved that the battery discharge system provided by this application can complete the discharge of the battery residual energy while completing the grid-connected recycling of electric energy, avoiding the waste of battery residual energy and improving the utilization rate of battery residual energy.

[0086] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0088] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0089] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery discharge system, characterized in that: The device comprises at least one DC / DC module connected to a battery to be discharged, an AC / DC module connected to the DC / DC module, and an isolation transformer connected to the AC / DC module and connected to a power grid, wherein: The DC / DC module is used to perform DC / DC conversion on the direct current output by the battery to be discharged; The AC / DC module is used to convert the direct current output by the DC / DC module into alternating current; The isolation transformer is used to send alternating current into the power grid.

2. The battery discharge system according to claim 1, characterized in that: Also includes: A first detection module provided between the DC / DC module and the battery to be discharged, and configured to detect a DC voltage and / or a DC current output by the battery to be discharged; A second detection module disposed between the DC / DC module and the AC / DC module, used for detecting a DC bus voltage and / or a DC bus current on a DC input terminal of the AC / DC module; A first switch element connected between the DC / DC module and the battery to be discharged is used to shut down when the DC voltage and / or DC current output by the battery to be discharged is not within a corresponding first preset range, or when the DC bus voltage and / or DC bus current at the DC input terminal of the AC / DC module is not within a corresponding second preset range, so as to disconnect the DC / DC module from the battery to be discharged.

3. The battery discharge system according to claim 2, characterized in that: It also includes a first control module connected to the first detection module, the second detection module and the first switch element, which is used to obtain data detected by the first detection module and the second detection module and to control the on and off of the first switch element.

4. The battery discharge system according to claim 1, characterized in that: It also includes a filtering and voltage stabilizing module arranged between the DC / DC module and the battery to be discharged, which is used for filtering and stabilizing the direct current output by the battery to be discharged.

5. The battery discharge system according to claim 1, characterized in that: It also includes an anti-electromagnetic interference module arranged between the DC / DC module and the battery to be discharged.

6. The battery discharge system according to claim 1, characterized in that: Also includes: A third detection module disposed between the AC / DC module and the isolation transformer, used for detecting the AC voltage and / or AC current output by the AC / DC module; A second switch element connected between the AC / DC module and the isolation transformer is used to shut down when the AC voltage and / or AC current output by the AC / DC module is not within a corresponding third preset range, so as to disconnect the connection between the AC / DC module and the isolation transformer.

7. The battery discharge system according to claim 6, characterized in that: It also includes a second control module connected to the third detection module and the second switch element, which is used to obtain data detected by the third detection module and to control the on and off of the second switch element.

8. The battery discharge system according to claim 1, characterized in that: It also includes a filter module arranged between the AC / DC module and the isolation transformer, which is used to filter the alternating current output by the AC / DC module.

9. The battery discharge system according to any one of claims 1 to 8, characterized in that: It also includes a first air switch arranged between the AC / DC module and the isolation transformer, and a second air switch arranged between the isolation transformer and the power grid.

10. The battery discharge system according to claim 9, characterized in that: It also includes a fan system, and the power supply of the fan system is connected to the AC output end of the AC / DC module.

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