Pre-charging loop of energy storage high-voltage box

Abstract

The utility model relates to a pre-charging loop of an energy storage high-voltage box. The pre-charging loop comprises a first circuit, a second circuit, a first branch circuit, a second branch circuit and a seventh switch. In a normal state, the controller controls the third switch to be switched on, and the first circuit, the fourth branch circuit and the second circuit form a main loop. When the battery is charged, the fourth switch, the seventh switch and the tenth switch are switched on, the ninth switch, the fifth switch and the third switch are switched off, the first circuit, the first branch circuit, the second branch circuit and the second circuit form a pre-charging loop, and the first resistor and the second resistor are connected in series to limit current. When the batteries are in a discharging state and the voltage difference between the battery clusters is larger than the specified voltage difference, the fourth switch, the fifth switch and the ninth switch are closed, the third switch and the seventh switch are disconnected, and the first resistor and the second resistor are connected in parallel to control current balance. The pre-charging loop of the energy storage high-voltage box can meet the resistance requirements of each state of the battery, reduce the heating value of the resistor and prolong the service life.

Description

Technical Field

[0001] This utility model relates to the field of pre-charge circuit technology, and in particular to a pre-charge circuit for an energy storage high-voltage box. Background Technology

[0002] Existing high-voltage energy storage box pre-charge / suppression circulating current circuits typically use a series power resistor for current suppression and voltage balancing. This results in significant self-loss of the pre-charge circuit and insufficient control precision.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a pre-charge circuit for an energy storage high-voltage box, which solves the problems of low control accuracy and high losses in the pre-charge circuit.

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

[0006] A pre-charge circuit for an energy storage high-voltage box includes: a first circuit connected between the positive terminal of a power source and the positive terminal of a battery; a second circuit connected between the negative terminal of a power source and the negative terminal of a battery; a first branch and a second branch connected in parallel to the first circuit, wherein a fourth switch, a first resistor, and a ninth switch are sequentially arranged from front to back on the first branch, and a fifth switch and a second resistor are sequentially arranged from front to back on the second branch; and a seventh switch, wherein the first end is connected between the first resistor and the ninth switch, and the second end is connected between the fifth switch and the second resistor.

[0007] A further technical solution is that the pre-charge circuit of the energy storage high-voltage box includes: a third branch, which is connected in parallel with the first branch and the second branch to the first circuit, and a sixth switch and a third resistor are arranged sequentially from front to back on the third branch; a tenth resistor, which is arranged on the second branch and located at the rear end of the second resistor; and an eighth resistor, whose first end is connected between the second resistor and the tenth switch, and whose second end is connected between the sixth switch and the third resistor.

[0008] A further technical solution is that the pre-charge circuit of the energy storage high-voltage box includes: a fourth branch, which is connected in parallel with the first branch, the second branch and the third branch to the first circuit; and a third switch, which is disposed on the fourth branch.

[0009] A further technical solution is that the pre-charge circuit of the energy storage high-voltage box includes: a first switch, which is set on the first circuit; and a second switch, which is set on the second circuit.

[0010] A further technical solution is that the pre-charge circuit of the energy storage high-voltage box includes: a high-voltage box, the front panel of which has a first input port, a second input port, a first output port, and a second output port. The outside of the first input port is connected to the positive terminal of the power supply, and the inside of the first input port is connected to the front end of the first circuit. The outside of the second input port is connected to the negative terminal of the power supply, and the inside of the second input port is connected to the front end of the second circuit. The outside of the first output port is connected to the positive terminal of the battery, and the inside of the first output port is connected to the rear end of the first circuit. The outside of the second output port is connected to the negative terminal of the battery, and the inside of the second output port is connected to the rear end of the second circuit.

[0011] A further technical solution is that the high-voltage box includes a sensor disposed inside the high-voltage box, and the first circuit and the second circuit respectively pass through the sensor.

[0012] A further technical solution is that the pre-charge circuit of the energy storage high-voltage box includes a controller, which is electrically connected to the sensor, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, and the tenth switch.

[0013] A further technical solution is that the controller is a BMS (Battery Management System).

[0014] The beneficial effects of this utility model embodiment are as follows:

[0015] (I) The pre-charge circuit of the energy storage high-voltage box of this utility model includes a first circuit, a second circuit, a first branch, a second branch, and a seventh switch. Under normal conditions, the controller controls the third switch to close, and the first circuit, the fourth branch, and the second circuit constitute the main circuit. When the battery is charging, the fourth switch and the seventh switch are closed, and the ninth switch, the fifth switch, and the third switch are opened. The first circuit, the first branch, the second branch, and the second circuit constitute the pre-charge circuit, and the first resistor and the second resistor are connected in series to limit the current. When the battery is discharging and the voltage difference between the battery clusters is greater than the specified voltage difference, the fourth switch, the fifth switch, and the ninth switch are closed, and the third switch and the seventh switch are opened. The first resistor and the second resistor are connected in parallel to control the current balance. The pre-charge circuit of the energy storage high-voltage box in this embodiment can meet the resistance requirements of the battery in various states, reduce the heat generated by the resistor, and improve the service life.

[0016] (II) Further, a third branch is included, which is connected in parallel to the first and second branches on the first circuit. A sixth switch and a third resistor are sequentially arranged on the third branch from front to back. A tenth switch is located on the second branch, downstream of the second resistor. The first end of the eighth switch is connected between the second resistor and the tenth switch, and the second end of the eighth switch is connected between the sixth switch and the third resistor. By closing the fourth, seventh, and eighth switches and opening the ninth, fifth, tenth, and sixth switches, the first, second, and third resistors are connected in series. By closing the switches on both sides of all resistors, the number of closed seventh and eighth switches determines the number of resistors connected in parallel; the more resistors connected in parallel, the smaller the resistance, further controlling the current balance of the battery cluster. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the pre-charge circuit of an energy storage high-voltage box according to the present invention.

[0018] Figure 2 This is a schematic diagram of the high-voltage box in the pre-charge circuit of an energy storage high-voltage box according to the present invention.

[0019] Figure 3 This is a connection diagram of the controller in the pre-charge circuit of an energy storage high-voltage box according to this utility model.

[0020] In the picture:

[0021] 1. First circuit; 11. First switch; 2. Second circuit; 21. Second switch; 3. First branch; 31. Fourth switch; 32. First resistor; 33. Ninth switch; 4. Second branch; 41. Fifth switch; 42. Second resistor; 43. Tenth switch; 5. Third branch; 51. Sixth switch; 52. Third resistor; 6. Fourth branch; 61. Third switch; 7. Seventh switch; 8. Eighth switch; 9. High voltage box; 91. Sensor; 92. Controller; 901. First input port; 902. Second input port; 903. First output port; 904. Second output port. Detailed Implementation

[0022] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the device proposed by this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer according to the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, only used to conveniently and clearly assist in illustrating the purpose of the embodiments of this utility model. Please refer to the accompanying drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification, for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0024] First embodiment:

[0025] This embodiment discloses a pre-charge circuit for an energy storage high-voltage box.

[0026] like Figure 1 As shown, the pre-charge circuit of the energy storage high-voltage box includes a first circuit 1, a second circuit 2, a first branch 3, a second branch 4, and a seventh switch 7.

[0027] The first circuit 1 is connected between the positive terminal of the power supply and the positive terminal of the battery. The second circuit 2 is connected between the negative terminal of the power supply and the negative terminal of the battery. The first branch 3 and the second branch 4 are connected in parallel to the first circuit 1. The fourth switch 31, the first resistor 32, and the ninth switch 33 are arranged sequentially from front to back on the first branch 3. The fifth switch 41 and the second resistor 42 are arranged sequentially from front to back on the second branch 4. The first terminal of the seventh switch 7 is connected between the first resistor 32 and the ninth switch 33, and the second terminal of the seventh switch 7 is connected between the fifth switch 41 and the second resistor 42.

[0028] like Figure 1 As shown, the pre-charge circuit of the energy storage high-voltage box further includes a fourth branch 6 and a third switch 61. The fourth branch 6 is connected in parallel to the first circuit 1 along with the first branch 3, the second branch 4, and the third branch 5, and the third switch 61 is disposed on the fourth branch 6. For example, the fourth branch 6 is integrated with the first circuit 1.

[0029] like Figure 1As shown, the pre-charge circuit of the energy storage high-voltage box further includes a first switch 11 and a second switch 21. The first switch 11 is set on the first circuit 1 and controls the on / off state of the entire first circuit 1. The second switch 21 is set on the second circuit 2 and controls the on / off state of the entire second circuit 2. The first switch 11 and the second switch 21 are normally closed.

[0030] like Figure 2 As shown, the pre-charge circuit of the energy storage high-voltage box further includes a high-voltage box 9. The front panel of the high-voltage box 9 has a first input port 901, a second input port 902, a first output port 903, and a second output port 904. The outer side of the first input port 901 is connected to the positive terminal of the power supply, and the inner side of the first input port 901 is connected to the front end of the first circuit 1. The outer side of the second input port 902 is connected to the negative terminal of the power supply, and the inner side of the second input port 902 is connected to the front end of the second circuit 2. The outer side of the first output port 903 is connected to the positive terminal of the battery, and the inner side of the first output port 903 is connected to the rear end of the first circuit 1. The outer side of the second output port 904 is connected to the negative terminal of the battery, and the inner side of the second output port 904 is connected to the rear end of the second circuit 2. The high-voltage box 9 plays a role in power transmission, control, and protection, ensuring the safe operation of the power system.

[0031] like Figure 2 and Figure 3 As shown, the high-voltage box 9 further includes a sensor 91, which is disposed inside the high-voltage box 9. The first circuit 1 and the second circuit 2 respectively pass through the sensor 91. For example, the sensor 91 is a Hall sensor 91, which detects the electrical signals in the first circuit 1 and the second circuit 2.

[0032] like Figure 2 and Figure 3 As shown, further, the pre-charge circuit of the energy storage high-voltage box includes a controller 92, which is electrically connected to a sensor 91, a first switch 11, a second switch 21, a third switch 61, a fourth switch 31, a fifth switch 41, a seventh switch 7, and a ninth switch 33. In this application, electrical connection refers to the connection between different components in a circuit via physical lines capable of transmitting electrical signals, such as PCB copper foil or wires. For example, the controller 92 is a BMS (Battery Management System). The BMS receives the detection results from the sensor 91 and controls the first switch 11, the second switch 21, the third switch 61, the fourth switch 31, the fifth switch 41, the seventh switch 7, and the ninth switch 33 to connect or disconnect; the control program is prior art.

[0033] In this embodiment, under normal conditions, the controller 92 controls the third switch 61 to close, and the first circuit 1, the fourth branch 6, and the second circuit 2 constitute the main circuit. When the battery is charging, the fourth switch 31 and the seventh switch 7 are closed, and the ninth switch 33, the fifth switch 41, and the third switch 61 are opened. The first circuit 1, the first branch 3, the second branch 4, and the second circuit 2 constitute the pre-charge circuit, and the first resistor 32 and the second resistor 42 are connected in series to limit the current. When the battery is discharging and the voltage difference between the battery clusters is greater than the specified voltage difference, the fourth switch 31, the fifth switch 41, and the ninth switch 33 are closed, and the third switch 61 and the seventh switch 7 are opened. The first resistor 32 and the second resistor 42 are connected in parallel to control current balance. The pre-charge circuit of the energy storage high-voltage box in this embodiment can meet the resistance requirements of the battery in various states, reduce the heat generated by the resistors, and improve the service life.

[0034] Second embodiment:

[0035] Based on the first embodiment, the second embodiment further optimizes and refines the pre-charge circuit of the energy storage high-voltage box.

[0036] like Figure 1 As shown, the pre-charge circuit of the energy storage high-voltage box includes a third branch 5, which is connected in parallel with the first branch 3 and the second branch 4 to the first circuit 1. A sixth switch 51 and a third resistor 52 are sequentially arranged on the third branch 5 from front to back. A tenth switch 43 is located on the second branch 4, downstream of the second resistor 42. The first end of an eighth switch 8 is connected between the second resistor 42 and the tenth switch 43, and the second end of the eighth switch 8 is connected between the sixth switch 51 and the third resistor 52. For example, the controller 92 is electrically connected to the sixth switch 51, the eighth switch 8, and the tenth switch 43.

[0037] Preferably, the pre-charge circuit of the energy storage high-voltage box includes several sets of parallel third branches 5, several sets of tenth switches 43, and several sets of eighth switches 8. A sixth switch 51 and a third resistor 52 are sequentially arranged from front to back on each set of third branches 5. Each set of tenth switches 43 is located at the rear end of the third resistor 52 in the previous set of third branches 5. The first end of each set of eighth switches 8 is connected between the third resistor 52 and the tenth switch 43 in the previous set of third branches 5, and the second end is connected between the sixth switch 51 and the third resistor 52 in its own set of third branches 5.

[0038] In this embodiment, the first resistor 32, the second resistor 42, and the third resistor 52 are connected in series by closing the fourth switch 31, the seventh switch 7, and the eighth switch 8, and opening the ninth switch 33, the fifth switch 41, the tenth switch 43, and the sixth switch 51. By closing the switches on both sides of all resistors, the number of times the seventh switch 7 and several eighth switches 8 are closed determines the number of resistors connected in parallel. The more resistors connected in parallel, the smaller the resistance, further controlling the current balance of the battery cluster.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A pre-charge circuit for an energy storage high-voltage box, characterized in that, The pre-charge circuit of the energy storage high-voltage box includes: The first circuit is connected between the positive terminal of the power supply and the positive terminal of the battery; The second circuit is connected between the negative terminal of the power supply and the negative terminal of the battery; The first branch and the second branch are connected in parallel to the first circuit. The first branch is provided with the fourth switch, the first resistor and the ninth switch in sequence from front to back. The second branch is provided with the fifth switch and the second resistor in sequence from front to back. The seventh switch has its first end connected between the first resistor and the ninth switch, and its second end connected between the fifth switch and the second resistor.

2. The pre-charge circuit for the energy storage high-voltage box according to claim 1, characterized in that, The pre-charge circuit of the energy storage high-voltage box includes: The third branch is connected in parallel to the first branch and the second branch on the first circuit. A sixth switch and a third resistor are arranged sequentially from front to back on the third branch. The tenth resistor is disposed on the second branch and located at the rear end of the second resistor; The eighth resistor has its first end connected between the second resistor and the tenth switch, and its second end connected between the sixth switch and the third resistor.

3. The pre-charge circuit for the energy storage high-voltage box according to claim 1 or 2, characterized in that, The pre-charge circuit of the energy storage high-voltage box includes: The fourth branch is connected in parallel to the first circuit along with the first, second, and third branches; The third switch is located on the fourth branch.

4. The pre-charge circuit for the energy storage high-voltage box according to claim 1, characterized in that, The pre-charge circuit of the energy storage high-voltage box includes: The first switch is set on the first circuit; The second switch is located on the second circuit.

5. The pre-charge circuit for the energy storage high-voltage box according to claim 1, characterized in that, The pre-charge circuit of the energy storage high-voltage box includes: A high-voltage box has a first input port, a second input port, a first output port, and a second output port on its front panel. The outer side of the first input port is connected to the positive terminal of the power supply, and the inner side of the first input port is connected to the front end of the first circuit. The outer side of the second input port is connected to the negative terminal of the power supply, and the inner side of the second input port is connected to the front end of the second circuit. The outer side of the first output port is connected to the positive terminal of the battery, and the inner side of the first output port is connected to the rear end of the first circuit. The outer side of the second output port is connected to the negative terminal of the battery, and the inner side of the second output port is connected to the rear end of the second circuit.

6. The pre-charge circuit for the energy storage high-voltage box according to claim 5, characterized in that, The high-voltage box includes a sensor disposed inside the high-voltage box, and the first circuit and the second circuit respectively pass through the sensor.

7. The pre-charge circuit for the energy storage high-voltage box according to claim 6, characterized in that, The pre-charge circuit of the energy storage high-voltage box includes: A controller, which is electrically connected to the sensor.

8. The pre-charge circuit of the energy storage high-voltage box according to claim 7, characterized in that: The controller is a BMS (Battery Management System).

Images