A battery control circuit for load shift protected on-line boost discharge

Abstract

The utility model requests protecting a kind of battery control circuit of online step-up discharging of preventing load transfer, it includes battery, boost module, pre-charging module, contactor K1 and contactor K2, nuclear capacity device is connected with the signal end of boost module, pre-charging module, contactor K1 and contactor K2 respectively;The positive pole and negative pole of battery are parallelly connected to external charging bus and load bus respectively, the positive pole of external power supply is connected to the output end of boost module and the positive pole of battery respectively, boost module side boost end and battery pack positive pole are connected, the other side boost end is connected by contactor K1 and battery pack negative pole, the negative pole of external power supply and the negative pole of battery are connected.The battery control circuit of the application is nuclear capacity to battery by DC / DC boost mode, when battery nuclear capacity, electric energy supplies load effectively, and the discharging process does not heat.

Description

Technical Field

[0001] This utility model relates to the field of battery capacity control technology, specifically to a battery control circuit for online boost discharge that prevents load transfer. Background Technology

[0002] Battery capacity assessment ensures battery performance and extends its lifespan. By assessing capacity, abnormal battery conditions, such as decreased capacity or increased internal resistance, can be detected and addressed promptly, preventing the battery from malfunctioning at critical moments. Furthermore, regular capacity assessments help users understand the battery's actual capacity, allowing for timely replacement or maintenance. In summary, battery capacity assessment is a crucial measure for ensuring stable power system operation and improving energy efficiency.

[0003] However, most existing battery capacity assessment methods first disconnect the battery from the power supply and then allow the battery to discharge to a dummy load. During the dummy load capacity assessment process, most of the electrical energy is consumed as heat, which fails to effectively utilize the battery's electrical energy and results in energy waste. Therefore, how to utilize the electrical energy during battery capacity assessment is the technical problem that this application aims to solve. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model proposes an online boost discharge battery control circuit that prevents load transfer. When the battery capacity is equalized, it can boost the voltage to discharge to the load, effectively utilizing electrical energy and preventing heat generation during the discharge process.

[0005] The technical solution of this utility model is as follows:

[0006] A battery control circuit for preventing load transfer and online boost discharge includes a battery, a boost module, a precharge module, contactors K1 and K2, wherein the battery is connected to the signal terminals of the boost module, the precharge module, contactors K1 and K2 respectively.

[0007] The positive terminal of the external power supply is connected to the output terminal of the boost module and the positive terminal of the battery, respectively. One input terminal of the boost module is connected to the positive terminal of the battery pack, and the other input terminal is connected to the negative terminal of the battery pack through contactor K1. The negative terminal of the external power supply is connected to the negative terminal of the battery.

[0008] The pre-charge module is connected in parallel to both ends of the battery.

[0009] In summary, the above technical solution has the following beneficial effects: The battery control circuit of this application uses a DC / DC boost mode to control the battery capacity. During battery capacity control, the electrical energy is effectively supplied to the load, and no heat is generated during the discharge process. During discharge, the battery is pressurized by the boost module to a voltage greater than the external power supply voltage, thus allowing the battery to continuously output to the load without the risk of offline operation. The boost discharge capacity control method is convenient to install and maintain, and has a moderate cost. The external power supply is the DC power generated by rectifier from AC power, which is connected in parallel to the load terminals and in parallel to the 48V bus in this application. Attached Figure Description

[0010] Figure 1 A schematic diagram of the capacity of a battery control circuit for online boost discharge with load transfer prevention;

[0011] Figure 2 A schematic diagram of equalization charging for an online boost discharge battery control circuit that prevents load transfer;

[0012] Figure 3 A schematic diagram of a float charge for an online boost discharge battery control circuit that prevents load transfer;

[0013] Figure 4 This is a schematic diagram of the main switch for an online boost discharge battery control circuit that prevents load transfer.

[0014] Reference numerals: 10, battery; 20, boost module; 30, precharge module; 40, buck unit; 41, buck module; 42, freewheeling diode. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0016] A control circuit for an online boost-discharge battery 10 with load transfer prevention includes a battery 10, a boost module 20, a pre-charge module 30, contactors K1 and K2. The battery 10 is connected to the signal terminals of the boost module 20, the pre-charge module 30, contactors K1 and K2, respectively. The positive terminal of an external power supply is connected to the output terminal of the boost module 20 and the positive terminal of the battery 10. One input terminal of the boost module 20 is connected to the positive terminal of the battery pack, and the other input terminal is connected to the negative terminal of the battery pack through contactor K1. The negative terminal of the external power supply is connected to the negative terminal of the battery 10. The pre-charge module 30 is connected in parallel to both ends of the battery 10.

[0017] The battery 10 control circuit of this application uses a DC / DC boost mode to limit the capacity of the battery 10. During capacity limiting, the electrical energy supplied to the load is effectively utilized, and no heat is generated during the discharge process. During discharge, the battery 10 is pressurized by the boost module 20 to a voltage greater than the external power supply voltage, thus ensuring continuous output to the load without the risk of offline operation. This boost-discharge capacity limiting method is convenient to install and maintain, and has a moderate cost. The external power supply is AC power rectified to DC power, which is connected in parallel to the load terminals and in parallel to the 48V bus in this application.

[0018] Specifically, the positive charging terminal of the pre-charging module 30 is connected to the positive terminal of the battery 10, and the negative charging terminal is connected to the negative terminal of the battery 10 through contactor K2.

[0019] like Figure 1 As shown, specifically, when the battery 10 is charged, the charging device controls the contactor K1 switch to close, energizing the boost module 20, and controls the contactor K2 switch to open, disconnecting the pre-charge module 30. The battery 10 is boosted through the boost module 20, and outputs a voltage greater than that of the external power supply from the output terminal of the boost module 20, thereby supplying power to the load by the battery 10.

[0020] like Figure 2 As shown, when the monitoring unit host determines that the battery 10 has completed its capacity assessment, the capacity assessment device controls the contactor K1 switch to open, causing the boost module 20 to disconnect, and controls the contactor K2 switch to close, causing the pre-charge module 30 to conduct, thereby enabling the charging module to charge the battery 10. The input of the pre-charge module 30 is an external 220V AC power supply, which is rectified by the pre-charge module 30 and then used to charge the battery 10.

[0021] like Figure 3 As shown, when the monitoring unit host determines that the battery 10 is fully charged, the capacity control contactor K2 switch is opened, causing the charging module to disconnect, and the external rectifier is connected to both ends of the battery 10 to perform float charging on the battery 10.

[0022] When all 10 batteries are fully charged, contactor K1 switches also open, disconnecting the boost module 20. Because the capacitive charging time is shorter than the float charging time, contactors K1 and K2 are preferably normally open contactors. The signal terminals of the boost module 20 and the pre-charge module 30 are also connected to an external capacitive charging unit host to determine their operating status.

[0023] The remote capacity verification system employs isolated boost technology for enhanced safety in capacity verification control. Through intelligent charge and discharge management, it can remotely discharge and verify the capacity of battery 10. The capacity verification device establishes remote communication with the boost module 20, pre-charge module 30, and monitoring unit host via a 485 network port or other communication network port. The device collects the operating status of the capacity verification circuit and indicates it via indicator lights. The operation indicator light indicates that the host is running; it illuminates in any operating state. The online float charge indicator light indicates that the host is in "online float charge state." The capacity test indicator light indicates that the host is conducting a capacity verification test; it illuminates when the host is performing a capacity verification test. The KD test indicator light indicates that the host is conducting a KD test. The internal resistance test indicator light indicates that the host is conducting an internal resistance test. The power outage discharge indicator light indicates that the host room is experiencing a power outage, and battery 10 is supplying power externally through the equipment.

[0024] It also includes a step-down unit 40, and the positive terminal of the power supply is connected to the positive terminal of the battery 10 through the step-down unit 40.

[0025] The step-down unit 40 includes a step-down module 41 and a contactor K0; the positive terminal of the power supply is connected to one end of the contactor K0 and one end of the step-down module 41, the other end of the contactor K0 is connected to the positive terminal of the battery 10, and the other end of the step-down module 41 is connected to the positive terminal of the battery 10.

[0026] When it is determined that the battery 10 has completed its capacity calculation, the pre-charge module 30 charges the battery 10, controls the contactor K0 switch to open, and turns on the step-down module 41. The step-down module 41 controls the voltage between the battery 10 and the load to be less than the voltage of the external power supply, thereby avoiding load interference with the charging of the battery 10.

[0027] Function of step-down module 41: Without step-down module 41, after the battery 10 is discharged, the charging module starts to charge the battery 10. As the charging process progresses, the charging voltage curve rises from low to high, with the highest equalization charging voltage reaching 56.3V. At this time, the voltage of the core capacitor circuit is higher than the normal voltage of 54V of the external power supply, creating a voltage difference with the external power supply bus. The freewheeling diode 42 on the core capacitor circuit is turned on, and the load on the external power supply is transferred to the core capacitor circuit. In addition to charging the battery 10, the pre-charge module 30 will also bear the entire load on the external power supply. Therefore, step-down module 41 is added in the design to adjust the voltage of step-down module 41 to 52V, which is lower than the external power supply voltage. This ensures that the voltage of 54V on the external power supply is always higher than the voltage on the core capacitor circuit, guaranteeing the normal operation of the core capacitor circuit.

[0028] When battery 10 is charging, the capacity control device opens contactor K0, connecting battery 10 and step-down module 41. This ensures that even if the voltage rise during charging exceeds the external power supply voltage, the step-down module 41 will reduce it to below the external power supply voltage, thus preventing the charging of battery 10 from being affected by the external power supply or load. When the monitoring unit determines that battery 10 is fully charged, the capacity control device closes contactor K0, short-circuiting step-down module 41, allowing external power to flow through contactor K0 for float charging of battery 10.

[0029] The step-down unit 40 also includes a freewheeling diode 42, and the positive terminal of the power supply is connected to the step-down module 41 through the freewheeling diode 42.

[0030] The positive terminal of the power supply is connected to the negative terminal of the freewheeling diode 42, and the positive terminal of the freewheeling diode 42 is connected to the step-down module 41.

[0031] The freewheeling diode 42 is used to prevent voltage and current surges and to provide a path.

[0032] It also includes a main control module, a main switch ZY, a discharge switch FD, and a charging switch CD. The main switch, discharge switch, and charging switch are used to connect the control terminals of contactor K0, contactor K1, and relay K2, respectively.

[0033] The main control module controls the switching on and off of the transistor module through the second optocoupler module. The transistor module is connected to the control terminals of the main switch, discharge switch, and charging switch, respectively. The other pins of the second optocoupler module and the transistor module are connected to the common terminal.

[0034] The first normally open output terminal of the main switch is connected to the first input terminal of the discharge switch, the second normally open output terminal is connected to the control terminal of contactor K0 through the first optocoupler module, the third normally open output terminal is connected to the first input terminal of the charging switch, and the fourth output terminal serves as a signal terminal; the first normally closed output terminal of the discharge switch is connected to the control terminal of the charging switch, and the second normally open output terminal controls the on / off state of contactor K1 through the first optocoupler module; the first normally closed output terminal of the charging switch is connected to the control terminal of the discharge switch for interlocking with the discharge switch, and the second normally open output terminal controls the on / off state of contactor K2 through the first optocoupler module.

[0035] When the main switch control terminal is engaged, the normally closed contactor K0 is energized and disconnects. The main control module energizes one of the control terminals of the charging and discharging switches. Because one line of the control terminal of the discharging and charging switches is controlled by the first normally closed output terminal of the other, when one control terminal of the discharging and charging switches is engaged, the other control terminal is not engaged, achieving an interlocking relationship where contactor K1 and contactor K2 are energized while the other is not. When the main switch control terminal is disconnected, neither the charging nor discharging switch can be energized. In the attached diagram, the ninth pin on the left side of the main switch, discharge switch, and charging switch is the first input terminal, the tenth pin is the second input terminal, the eleventh pin is the third input terminal, and the twelfth pin is the fourth input terminal. On the right side, the first pin is the first normally closed output terminal, the fifth pin is the first normally open output terminal, the second pin is the second normally closed output terminal, the sixth pin is the second normally open output terminal, the third pin is the third normally closed output terminal, the seventh pin is the third normally open output terminal, the fourth pin is the fourth normally closed output terminal, and the eighth pin is the fourth normally open output terminal. The thirteenth and fourteenth pins on the left side serve as control terminals. The first optocoupler module, the second optocoupler module, and the transistor module act as isolating switches.

[0036] Contactor K0 is a normally closed contactor, while contactors K1 and K2 are normally open contactors.

[0037] This configuration ensures that when the normally closed contactor K0 is not energized, the normally open contactors K1 and K2 cannot be energized and closed, and the capacitance system is in a floating charge state. When capacitance verification is required, the normally closed contactor K0 is energized and opened, and then the normally open contactor K1 can be controlled to close, allowing the boost module 20 to conduct and discharge for capacitance verification. At this time, the normally open contactor K2 cannot be energized and closed due to interlocking, and the pre-charge module 30 cannot operate. When capacitance verification is complete, the normally open contactor K1 can be de-energized and opened, ending the boost of the boost module 20. Then, the normally open contactor K2 can be energized and closed, allowing the pre-charge module 30 to conduct and operate, achieving equal charging of the 10 batteries. This makes equipment control more intelligent and safer.

[0038] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A battery control circuit for preventing load transfer and online boost discharge, characterized in that, It includes a storage battery (10), a boost module (20), a pre-charge module (30), a contactor K1 and a contactor K2, wherein the storage battery (10) is connected to the signal terminals of the boost module (20), the pre-charge module (30), the contactor K1 and the contactor K2 respectively; The positive terminal of the external power supply is connected to the output terminal of the boost module (20) and the positive terminal of the battery (10). The input terminal of the boost module (20) on one side is connected to the positive terminal of the battery pack, and the input terminal on the other side is connected to the negative terminal of the battery pack through contactor K1. The negative terminal of the external power supply is connected to the negative terminal of the battery (10). The pre-charge module (30) is connected in parallel to both ends of the battery (10).

2. The battery control circuit for online boost discharge with load transfer prevention according to claim 1, characterized in that, It also includes a step-down unit (40), and the positive terminal of the power supply is connected to the positive terminal of the battery (10) through the step-down unit (40).

3. The battery control circuit for online boost discharge with load transfer prevention according to claim 2, characterized in that, The step-down unit (40) includes a step-down module (41) and a contactor K0; The positive terminal of the external power supply is connected to one end of the contactor K0 and one end of the step-down module (41), the other end of the contactor K0 is connected to the positive terminal of the battery (10), and the other end of the step-down module (41) is connected to the positive terminal of the battery (10).

4. The battery control circuit for online boost discharge with load transfer prevention according to claim 3, characterized in that, The step-down unit (40) also includes a freewheeling diode (42), and the positive terminal of the external power supply is connected to the step-down module (41) through the freewheeling diode (42).

5. A battery control circuit for online boost discharge with load transfer prevention according to claim 4, characterized in that, The positive terminal of the external power supply is connected to the negative terminal of the freewheeling diode (42), and the positive terminal of the freewheeling diode (42) is connected to the step-down module (41).

6. The battery control circuit for online boost discharge with load transfer prevention according to claim 3, characterized in that, The contactor K0 is a normally closed contactor.

7. A battery control circuit for online boost discharge with load transfer prevention according to claim 3, characterized in that, The contactor K1 is a normally open contactor.

8. A battery control circuit for online boost discharge with load transfer prevention according to claim 3, characterized in that, The contactor K2 is a normally open contactor.

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