Pre-charging circuit of battery pack, pre-charging control system, battery pack and electric equipment

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By designing a precharge circuit including transistor Q and charge and discharge energy storage circuit in the battery pack, the precharge current of the capacitor is controlled, and the problem of inaccurate resistance adjustment in the prior art is solved, the controllability of the precharge current and time is achieved, and energy consumption is reduced.

CN222638207UActive Publication Date: 2025-03-18JIANGSU TRINATEC ELECTRIC CO LTD

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Patent Information

Application Number: CN202421171953.X
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-05-27
Publication Date: 2025-03-18
Estimated Expiration: 2034-05-27

AI Technical Summary

Technical Problem

The existing battery pack precharge circuit cannot quickly and accurately adjust the resistance value, resulting in uncontrollable precharge current and time and high energy consumption.

Method used

A precharge circuit including transistor Q and a charge and discharge energy storage circuit is designed. By controlling the conduction and shutdown of transistor Q, the precharge current of the capacitor is adjusted to achieve slow charging of the capacitor.

Benefits of technology

The energy consumption in the pre-charge resistor is reduced through slow charging, making the pre-charge current and time controllable, and avoiding the surge current at the start of the battery pack.

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Abstract

The utility model relates to the field of energy storage converters, in particular to a pre-charging circuit of a battery pack, a pre-charging control system, the battery pack and electric equipment, and the pre-charging circuit is arranged in the battery pack and comprises a transistor Q and a charging and discharging energy storage circuit; wherein the first end of the transistor Q is connected with the positive electrode of a battery cell module in the battery pack, and the second end of the transistor Q is electrically connected with the charging and discharging energy storage circuit; one end of the charging and discharging energy storage circuit is connected with the total positive electrode of the battery pack, and the other end of the charging and discharging energy storage circuit is electrically connected with the total negative electrode of the battery pack and the negative electrode of the battery cell module; the control end of the transistor Q is suitable for being connected with an on-off regulation and control signal. The pre-charging current and the pre-charging time of the capacitor are adjusted by controlling the conduction of the transistor Q, so that the energy consumed in the pre-charging resistor is reduced, and the pre-charging current and the pre-charging time are controllable.

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Description

Technical Field

[0001] The utility model relates to the field of energy storage converters, and in particular to a pre-charging circuit of a battery pack, a pre-charging control system, a battery pack and electrical equipment. Background Art

[0002] In the photovoltaic storage industry, energy storage batteries are connected to photovoltaic storage inverters for grid connection and to provide electricity to users. The large current when the battery is started will impact subsequent components or equipment, causing equipment damage. Therefore, an effective pre-charging circuit is added between the battery pack and the inverter to prevent the large current of the battery energy storage from impacting subsequent components or equipment. One of the existing pre-charging circuits uses a varistor that requires an external control circuit to control the change in the resistor value, and the other is a resistor that uses a fixed resistor. However, the circuits of these two methods are relatively complex and cannot quickly and accurately adjust the resistance value, resulting in high energy consumption in the resistor, and the pre-charging current and pre-charging time cannot be controlled.

[0003] Therefore, in order to solve the technical problem that the existing circuit cannot quickly and accurately adjust the resistance if a resistor is used, so that the pre-charging current and pre-charging time are controllable, it is necessary to design a battery pack pre-charging circuit, pre-charging control system and battery pack. Utility Model Content

[0004] In order to solve the technical problems mentioned in the background technology, the utility model provides a pre-charging circuit of a battery pack, a pre-charging control system, a battery pack and an electrical device:

[0005] In a first aspect, the utility model provides a pre-charging circuit of a battery pack.

[0006] The pre-charging circuit is arranged in the battery pack and comprises: a transistor Q and a charge and discharge energy storage circuit; wherein

[0007] The first end of the transistor Q is connected to the positive electrode of the battery cell module in the battery pack, and the second end thereof is electrically connected to the charge and discharge energy storage circuit; and

[0008] One end of the charge and discharge energy storage circuit is connected to the total positive electrode of the battery pack, and the other end is respectively connected to the total negative electrode of the battery pack and the negative electrode of the battery cell module;

[0009] The control end of the transistor Q is suitable for receiving an on-off control signal.

[0010] Further, the charging and discharging energy storage circuit includes: a diode D1 and an inductor L;

[0011] The cathode of the diode D1 is electrically connected to the transistor Q, and the anode of the diode D1 is electrically connected to the negative electrode of the battery cell module and is led out as the total negative electrode of the battery pack;

[0012] One end of the inductor L is electrically connected to the transistor Q, and the other end is connected to the total positive electrode of the battery pack.

[0013] In a second aspect, the utility model provides a pre-charging control system, comprising:

[0014] A pre-charging circuit, the pre-charging circuit is arranged in the battery pack and comprises: a transistor Q, a diode D1 and an inductor L; wherein the first end of the transistor Q is connected to the positive electrode of the battery cell module in the battery pack, and the second end thereof is connected to the total positive electrode of the battery pack through the inductor; and the second end of the transistor Q is also electrically connected to the cathode of the diode, the anode of the diode is electrically connected to the negative electrode of the battery cell module, and is led out as the total negative electrode of the battery pack;

[0015] A control module, whose on-off control signal output terminal is electrically connected to the control terminal of the transistor Q;

[0016] The detection module detects the output voltage of the battery pack and feeds it back to the control module to adjust the on-off control signal.

[0017] Furthermore, the pre-charging control system further includes:

[0018] A PCS load module, wherein the PCS load module is electrically connected to a power output terminal of the battery pack.

[0019] Further, the PCS load module includes: a filter capacitor C arranged in parallel with the power output terminal;

[0020] The detection module detects the voltage value of the filter capacitor C and feeds it back to the control module to adjust the on-off control signal.

[0021] Further, the PCS load module also includes: a DC-DC module and a DC-AC module;

[0022] The output voltage of the battery pack passes through the filter capacitor C and is converted into alternating current through the DC-DC module and the DC-AC module for external output.

[0023] Further, the PCS load module also includes: a DC-DC module;

[0024] The output voltage of the battery pack passes through the filter capacitor C and is output to the outside through the DC-DC module.

[0025] Further, the PCS load module also includes: a DC-AC module;

[0026] The output voltage of the battery pack is converted into AC through a DC-AC module after passing through a filter capacitor C and then outputted externally.

[0027] In a third aspect, the utility model provides a battery pack, comprising the pre-charging circuit described above.

[0028] In a fourth aspect, the utility model provides an electrical device, including the pre-charging control system as described above.

[0029] The beneficial effect of the utility model is that the utility model controls the on and off of the transistor Q, thereby controlling the pre-charge current of the capacitor, and by slowly charging the capacitor, reduces the energy consumed in the pre-charge resistor, making the pre-charge current and pre-charge time controllable.

[0030] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A circuit schematic diagram of a pre-charging circuit involved in some embodiments is shown;

[0034] Figure 2 A circuit principle block diagram of a pre-charging control system involved in some embodiments is shown;

[0035] Figure 3 A circuit schematic diagram of a pre-charging control system according to some embodiments is shown. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] like Figure 1 As shown, at least one embodiment of the utility model provides a pre-charging circuit of a battery pack, wherein the pre-charging circuit is arranged in the battery pack and comprises: a transistor Q and a charge and discharge energy storage circuit; wherein the first end of the transistor Q is connected to the positive electrode of the battery cell module in the battery pack, and the second end thereof is electrically connected to the charge and discharge energy storage circuit; and one end of the charge and discharge energy storage circuit is connected to the total positive electrode of the battery pack, and the other end is respectively electrically connected to the total negative electrode of the battery pack and the negative electrode of the battery cell module; and the control end of the transistor Q is suitable for receiving an on-off control signal.

[0038] In some embodiments, the charge and discharge energy storage circuit includes: a diode D1 and an inductor L; the cathode of the diode D1 is electrically connected to the transistor Q, and the anode of the diode D1 is electrically connected to the negative electrode of the battery cell module, and is led out as the total negative electrode of the battery pack; one end of the inductor L is electrically connected to the transistor Q, and the other end is connected to the total positive electrode of the battery pack.

[0039] like Figure 2 As shown, some embodiments provide a pre-charging control system, including: a pre-charging circuit, which is arranged in a battery pack and includes: a transistor Q, a diode D1 and an inductor L; wherein the first end of the transistor Q is connected to the positive electrode of the battery cell module in the battery pack, and the second end thereof is connected to the total positive electrode of the battery pack through the inductor; and the second end of the transistor Q is also electrically connected to the cathode of the diode, the anode of the diode is electrically connected to the negative electrode of the battery cell module, and is led out as the total negative electrode of the battery pack; a control module, whose on-off control signal is electrically connected to the control end of the transistor Q; a detection module, which detects the output voltage of the battery pack and feeds back to the control module to adjust the on-off control signal.

[0040] like Figure 3 As shown, some embodiments provide that the pre-charging control system further includes a PCS load module, and the PCS load module is electrically connected to the power output terminal of the battery pack.

[0041] In some embodiments, the PCS load module includes: a filter capacitor C connected in parallel with the power output terminal; the detection module detects the voltage value of the filter capacitor C and feeds it back to the control module to adjust the on-off control signal. The filter capacitor C is used to smooth the DC voltage output by the battery, reduce voltage fluctuations and ripples, and provide a more stable power supply.

[0042] In some embodiments, the PCS load module further includes: a DC-DC module and a DC-AC module; after the output voltage of the battery pack passes through the filter capacitor C, it is converted into AC through the DC-DC module and the DC-AC module in sequence for external output. Through the filter capacitor and the DC-DC module, the system can provide a more stable voltage output, reduce the impact of voltage fluctuations on sensitive electronic devices, and the DC-AC module allows direct current to be converted into alternating current, so that conventional AC loads can be supplied.

[0043] In some embodiments, the PCS load module further includes: a DC-DC module; the output voltage of the battery pack is output to the outside through the DC-DC module after passing through the filter capacitor C.

[0044] In some embodiments, the PCS load module further includes: a DC-AC module; the output voltage of the battery pack is converted into AC through the DC-AC module after passing through the filter capacitor C and then outputted externally.

[0045] Among them, when the battery pack is started, the detection module detects the battery voltage and the voltage of the filter capacitor C, and inputs the two voltages into the control module. After comparison in the control module, the two voltages differ greatly, and the voltage of the filter capacitor C is far from 90% of the battery voltage. Therefore, the control module controls the duty cycle of the switching signal PWM of the transistor QQ, and charges the capacitor with a small current pulse from a narrower PWM duty cycle. After the capacitor voltage gradually rises, in order to reduce the pre-charge time, the PWM duty cycle is increased to increase the pre-charge current of the capacitor C. When the voltage of the capacitor C reaches 90% of the battery voltage, the PWM duty cycle is adjusted to 1, that is, the IGBT is turned on, so that the battery voltage directly charges the capacitor. By controlling the PWM duty cycle and then controlling the pre-charge current size and pre-charge time of the filter capacitor C, the surge current when the battery pack is started can be limited to a large extent, avoiding large current damage to the filter capacitor.

[0046] The various devices selected in this embodiment (components whose specific structures are not described) are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel in this field through technical manuals or through conventional experimental methods; the detection module in this embodiment can be used for monitoring and managing the battery pack status by, but not limited to, battery voltage monitoring, current signal and temperature detection, and the control module in this embodiment determines the output control signal to the transistor Q according to the compared voltage difference, thereby controlling the opening and closing of the transistor Q. The method belongs to the scope of the prior art, and this embodiment does not make substantial improvements to the above method.

[0047] Some embodiments provide a battery pack including the pre-charging circuit as described above.

[0048] Some embodiments provide an electrical device, comprising the pre-charging control system as described above.

[0049] In summary, the utility model controls the on and off of the transistor Q, thereby controlling the pre-charge current of the capacitor. By slowly charging the capacitor, the energy consumed in the pre-charge resistor is reduced, making the pre-charge current and pre-charge time controllable.

[0050] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0052] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. With the above-mentioned ideal embodiments of the utility model as inspiration, through the above-mentioned description, relevant staff can make various changes and modifications without departing from the scope of the technical idea of the utility model. The technical scope of the utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A pre-charging circuit for a battery pack, characterized in that: The pre-charging circuit is arranged in the battery pack and comprises: a transistor Q and a charge and discharge energy storage circuit; wherein The first end of the transistor Q is connected to the positive electrode of the battery cell module in the battery pack, and the second end thereof is electrically connected to the charge and discharge energy storage circuit; and One end of the charge and discharge energy storage circuit is connected to the total positive electrode of the battery pack, and the other end is respectively connected to the total negative electrode of the battery pack and the negative electrode of the battery cell module; The control end of the transistor Q is suitable for receiving an on-off control signal.

2. precharge circuit according to claim 1, characterized in that, The charging and discharging energy storage circuit comprises: a diode D1 and an inductor L; The cathode of the diode D1 is electrically connected to the transistor Q, and the anode of the diode D1 is electrically connected to the negative electrode of the battery cell module and is led out as the total negative electrode of the battery pack; One end of the inductor L is electrically connected to the transistor Q, and the other end is connected to the total positive electrode of the battery pack.

3. A pre-charging control system, characterized in that: include: A pre-charging circuit, the pre-charging circuit is arranged in the battery pack and comprises: a transistor Q, a diode D1 and an inductor L; wherein the first end of the transistor Q is connected to the positive electrode of the battery cell module in the battery pack, and the second end thereof is connected to the total positive electrode of the battery pack through the inductor; and the second end of the transistor Q is also electrically connected to the cathode of the diode, the anode of the diode is electrically connected to the negative electrode of the battery cell module, and is led out as the total negative electrode of the battery pack; A control module, whose on-off control signal is electrically connected to the control end of the transistor Q; The detection module detects the output voltage of the battery pack and feeds it back to the control module to adjust the on-off control signal.

4. The pre-charging control system according to claim 3, characterized in that: Also includes: A PCS load module, wherein the PCS load module is electrically connected to a power output terminal of the battery pack.

5. The pre-charging control system according to claim 4, characterized in that: The PCS load module comprises: a filter capacitor C arranged in parallel with the power output terminal; The detection module detects the voltage value of the filter capacitor C and feeds it back to the control module to adjust the on-off control signal.

6. The pre-charging control system according to claim 5, characterized in that: The PCS load module also includes: a DC-DC module and a DC-AC module; The output voltage of the battery pack passes through the filter capacitor C and is converted into alternating current through the DC-DC module and the DC-AC module for external output.

7. The pre-charging control system according to claim 5, characterized in that: The PCS load module also includes: a DC-DC module; The output voltage of the battery pack passes through the filter capacitor C and is output to the outside through the DC-DC module.

8. The pre-charging control system according to claim 5, characterized in that: The PCS load module also includes: a DC-AC module; The output voltage of the battery pack is converted into AC through a DC-AC module after passing through a filter capacitor C and then outputted externally.

9. A battery pack, characterized in that: Includes the pre-charging circuit as described in claim 1 or 2.

10. An electrical device, characterized in that: Including the pre-charging control system described in any one of claims 3-8.