Lithium battery power supply connection relationship detection circuit

Abstract

The application provides a lithium battery power connection relationship detection circuit, a first power supply and a second power supply are connected in series or in parallel to form a power supply system; the detection circuit is used for detecting the series-parallel relationship between the first power supply and the second power supply; and the detection circuit comprises a voltage acquisition module, a voltage detection module and a main control module; a first input end of the voltage acquisition module is connected with a negative electrode of the first power supply, a second input end of the voltage acquisition module is connected with a negative electrode of the second power supply, and an output end of the voltage acquisition module is connected with an input end of the voltage detection module; an output end of the voltage detection module is connected with the main control module; and the main control module is used for receiving a detection signal output by the output end of the voltage detection module and determining the series-parallel relationship between the first power supply and the second power supply according to the detection signal. In the application, the voltage difference between the negative electrodes of the two power supplies is detected, and the series-parallel relationship between the two power supplies is determined according to the voltage difference, so that the circuit structure is simple and the detection is fast.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a lithium battery power supply connection relationship detection circuit. BACKGROUND

[0002] Lithium batteries are widely used in various fields due to their high energy density, high power and long cycle life. Lithium battery power supply is powered by lithium batteries and is used to provide energy for electrical equipment. To meet different power needs, multiple lithium battery power supplies can be connected in series or parallel to meet different power needs.

[0003] In the prior art, the output voltage of the power supply system formed by the lithium battery power supply cannot be quickly detected in the case that the output voltage of the power supply system formed by the lithium battery power supply is unknown. SUMMARY

[0004] The lithium battery power supply connection relationship detection circuit provided by the embodiments of the present application solves the problem that there is no effective technical means for detecting the series and parallel of lithium battery power supply in the prior art.

[0005] In a first aspect, the embodiments of the present application provide a lithium battery power supply connection relationship detection circuit, a first power supply and a second power supply are connected in series or parallel to form a power supply system; the detection circuit is used to detect the series and parallel relationship between the first power supply and the second power supply; wherein the series and parallel relationship between the first power supply and the second power supply can be switched;

[0006] The detection circuit comprises a voltage acquisition module, a voltage detection module and a main control module.

[0007] The first input end of the voltage acquisition module is connected with the negative electrode of the first power supply, the second input end of the voltage acquisition module is connected with the negative electrode of the second power supply, and the output end of the voltage acquisition module is connected with the input end of the voltage detection module.

[0008] The output end of the voltage detection module is connected with the main control module.

[0009] The main control module is used to receive the detection signal output by the output end of the voltage detection module, and determine the series and parallel relationship between the first power supply and the second power supply according to the detection signal.

[0010] Optionally, the input end of the voltage detection module comprises a first voltage input end and a second voltage input end; wherein the first voltage input end is connected with the output end of the voltage acquisition module, and the second voltage input end is connected with the second input end of the voltage acquisition module.

[0011] The voltage acquisition module comprises a first resistor and a second resistor.

[0012] The first end of the first resistor is connected with the first input end of the voltage acquisition module, and the second end of the first resistor is connected with the first end of the second resistor and the output end of the voltage acquisition module respectively;

[0013] The second end of the second resistor is connected with the second input end of the voltage acquisition module.

[0014] Optionally, the voltage detection module comprises: an optocoupler, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor.

[0015] The positive input end of the optocoupler is connected with the first end of the third resistor and the first end of the fourth resistor respectively, the negative input end of the optocoupler is connected with the second end of the fourth resistor and the first end of the fifth resistor respectively, the positive output end of the optocoupler is connected with the first end of the sixth resistor and the output end of the voltage detection module respectively, and the negative output end of the optocoupler is grounded.

[0016] The second end of the third resistor is connected with the first voltage input end of the voltage detection module.

[0017] The second end of the fifth resistor is connected with the second voltage input end of the voltage detection module.

[0018] The second end of the sixth resistor is connected with the direct current power supply.

[0019] Optionally, the voltage detection module further comprises: a stabilizing diode.

[0020] The cathode of the stabilizing diode is connected with the positive input end of the optocoupler, and the anode of the stabilizing diode is connected with the negative input end of the optocoupler.

[0021] Optionally, the voltage detection module further comprises: a first capacitor and a second capacitor.

[0022] The first capacitor is connected with the fourth resistor in parallel.

[0023] The first end of the second capacitor is connected with the positive output end of the optocoupler, and the second end of the second capacitor is grounded.

[0024] Optionally, the power supply system further comprises: two series-parallel shorting rows.

[0025] The positive pole of the first power supply is connected with the positive output end of the power supply system, and the negative pole of the first power supply is connected with the neutral end of the power supply system.

[0026] The positive pole of the second power supply is vacant, and the second end of the second power supply is connected with the negative output end of the power supply system.

[0027] One of the series-parallel shorting rows is overlapped between the negative pole of the first power supply and the positive pole of the second power supply, so that the first power supply and the second power supply are connected in series; or

[0028] One string-parallel-short-circuit row is connected between the positive pole of the first power supply and the positive pole of the second power supply, and another string-parallel-short-circuit row is connected between the negative pole of the first power supply and the negative pole of the second power supply, so that the first power supply and the second power supply are connected in parallel.

[0029] Optionally, the power supply system further comprises a first connecting line, a second connecting line, a third connecting line and a fourth connecting line.

[0030] The positive pole of the first power supply is connected to the positive output end of the power supply system through the first connecting line.

[0031] The positive pole of the second power supply is connected to the second connecting line.

[0032] The negative pole of the first power supply is connected to the neutral line end of the power supply system through the third connecting line.

[0033] The negative pole of the second power supply is connected to the negative output end of the power supply system through the fourth connecting line.

[0034] One string-parallel-short-circuit row is connected between the second connecting line and the third connecting line, so that the first power supply and the second power supply are connected in series.

[0035] One string-parallel-short-circuit row is connected between the first connecting line and the second connecting line, and another string-parallel-short-circuit row is connected between the third connecting line and the fourth connecting line, so that the first power supply and the second power supply are connected in parallel.

[0036] Optionally, the number of the first power supplies is at least one, the number of the second power supplies is at least one, and the number of the first power supplies is the same as the number of the second power supplies.

[0037] The positive pole of each first power supply is connected to the first connecting line, and the negative pole of each first power supply is connected to the third connecting line.

[0038] The positive pole of each second power supply is connected to the second connecting line, and the negative pole of each second power supply is connected to the fourth connecting line.

[0039] One string-parallel-short-circuit row is connected between the second connecting line and the third connecting line, so that each first power supply is connected in series with a corresponding second power supply.

[0040] One string-parallel-short-circuit row is connected between the first connecting line and the second connecting line, and another string-parallel-short-circuit row is connected between the third connecting line and the fourth connecting line, so that each first power supply is connected in parallel with a corresponding second power supply.

[0041] Optionally, the first connecting line, the second connecting line, the third connecting line and the fourth connecting line are arranged in sequence and side by side.

[0042] The embodiment of the present application provides a lithium battery power supply connection relationship detection circuit, a first power supply and a second power supply are connected in series or in parallel to form a power supply system; the detection circuit is used for detecting the series-parallel relationship between the first power supply and the second power supply; wherein the series-parallel relationship between the first power supply and the second power supply is switchable; the detection circuit comprises a voltage acquisition module, a voltage detection module and a main control module; a first input end of the voltage acquisition module is used for being connected with a negative electrode of the first power supply, a second input end of the voltage acquisition module is used for being connected with a negative electrode of the second power supply, and an output end of the voltage acquisition module is connected with an input end of the voltage detection module; an output end of the voltage detection module is connected with the main control module; the main control module is used for receiving a detection signal output by the output end of the voltage detection module, and determining the series-parallel relationship between the first power supply and the second power supply according to the detection signal. In the embodiment of the present application, the voltage acquisition module acquires the voltage difference between the negative electrodes of the two power supplies, and the voltage detection module converts the voltage difference into a detection signal and sends the detection signal to the main control module, finally the main control module determines the series-parallel relationship between the two according to the detection signal, and the circuit structure is simple and the detection is fast. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0044] Figure 1 It is a circuit structure schematic diagram of a lithium battery power supply connection relationship detection circuit provided by the embodiment of the present application;

[0045] Figure 2 It is a circuit principle diagram of a voltage acquisition module provided by the embodiment of the present application;

[0046] Figure 3 It is a circuit principle diagram of a voltage detection module provided by the embodiment of the present application;

[0047] Figure 4 It is a power supply system schematic diagram of the first power supply and the second power supply connected in series provided by the embodiment of the present application;

[0048] Figure 5 It is a power supply system schematic diagram of the first power supply and the second power supply connected in parallel provided by the embodiment of the present application;

[0049] Figure 6 It is another power supply system schematic diagram of the first power supply and the second power supply connected in series provided by the embodiment of the present application;

[0050] Figure 7is another first power supply and second power supply parallel power supply system schematic diagram provided by the embodiment of the present application. DETAILED DESCRIPTION

[0051] In the following description, for the purpose of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0052] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be described by specific embodiments in conjunction with the accompanying drawings.

[0053] Referring to Figure 1 It shows a lithium battery power supply connection relationship detection circuit provided by the embodiment of the present application, and the first power supply and the second power supply are in series or parallel to form a power supply system; the detection circuit is used for detecting the series-parallel relationship between the first power supply and the second power supply; wherein the series-parallel relationship between the first power supply and the second power supply is switchable.

[0054] The detection circuit comprises a voltage acquisition module 11, a voltage detection module 12 and a main control module 13.

[0055] The first input end of the voltage acquisition module 11 is used for being connected with the negative pole GND1 of the first power supply, the second input end of the voltage acquisition module 11 is used for being connected with the negative pole GND2 of the second power supply, and the output end of the voltage acquisition module 11 is connected with the input end of the voltage detection module 12.

[0056] The output end of the voltage detection module 12 is connected with the main control module 13.

[0057] The main control module 13 is used for receiving the detection signal output by the output end of the voltage detection module 12, and determining the series-parallel relationship between the first power supply and the second power supply according to the detection signal.

[0058] In the embodiment of the present application, the first power supply and the second power supply are both lithium battery power supplies, and the first power supply and the second power supply are in series or parallel to form a power supply system. For example, the rated voltage of the two power supplies is U; if the two power supplies are in series, the output voltage of the power supply system is 2U; if the two power supplies are in parallel, the output voltage of the power supply system is U.

[0059] Meanwhile, when the first power supply and the second power supply are connected in parallel, the negative poles (GND1 and GND2) of the two power supplies are connected, so that the voltage difference between the negative poles of the two power supplies is small; and when the first power supply and the second power supply are connected in series, the voltage difference between the negative poles (GND1 and GND2) of the two power supplies is relatively large. Based on this, in the embodiment of the application, the voltage acquisition module 11 acquires the voltage difference between the negative poles of the two power supplies and matches the voltage difference to a suitable voltage to send to the voltage detection module 12, the voltage detection module 12 generates a detection signal according to the voltage difference and sends the detection signal to the main control module 13, and the main control module 13 determines the series-parallel relationship between the two power supplies according to the detection signal, so that the circuit structure is simple and the detection is fast.

[0060] For example, when the voltage difference between the negative pole GND1 of the first power supply and the negative pole GND2 of the second power supply is greater than a preset voltage, the detection signal is a first level, and then the main control module 13 determines that the first power supply and the second power supply are connected in series; when the voltage difference between the negative pole GND1 of the first power supply and the negative pole GND2 of the second power supply is less than the preset voltage, the detection signal is a second level, and then the main control module 13 can determine that the first power supply and the second power supply are connected in parallel.

[0061] Specifically, the first level can be a low level, and the second level can be a high level.

[0062] In a possible implementation manner, referring to Figure 2 , the input end of the voltage detection module 12 can include a first voltage input end and a second voltage input end; the first voltage input end is connected with the output end of the voltage acquisition module 11, and the second voltage input end is connected with the second input end of the voltage acquisition module 11.

[0063] The voltage acquisition module 11 can include a first resistor R1 and a second resistor R2.

[0064] The first end of the first resistor R1 is connected with the first input end of the voltage acquisition module 11, and the second end of the first resistor R1 is connected with the first end of the second resistor R2 and the output end of the voltage acquisition module 11 respectively.

[0065] The second end of the second resistor R2 is connected with the second input end of the voltage acquisition module 11.

[0066] In the embodiment of the application, the first input end and the second input end of the voltage acquisition module 11 acquire the voltage difference between the negative poles of the two power supplies, and send the voltage difference to the voltage detection module 12 after voltage matching through voltage division of the first resistor R1 and the second resistor R2, so that the structure is simple, the devices are few, and the cost is low.

[0067] In a possible implementation manner, referring to Figure 3 , the voltage detection module 12 can include an optical coupler U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6.

[0068] The positive input end of the optical coupler U1 is connected with the first end of the third resistor R3 and the first end of the fourth resistor R4 respectively, the negative input end of the optical coupler U1 is connected with the second end of the fourth resistor R4 and the first end of the fifth resistor R5 respectively, the positive output end of the optical coupler U1 is connected with the first end of the sixth resistor R6 and the output end of the voltage detection module 12 respectively, and the negative output end of the optical coupler U1 is grounded.

[0069] The second end of the third resistor R3 is connected with the first voltage input end of the voltage detection module 12.

[0070] The second end of the fifth resistor R5 is connected with the second voltage input end of the voltage detection module 12.

[0071] The second end of the sixth resistor R6 is connected with the direct current power supply VCC3.

[0072] The optical coupler is a device for transmitting electrical signals by using light as a medium, the signal is transmitted in one direction, the input end and the output end are completely electrically isolated, the output signal has no effect on the input end, the anti-interference ability is strong, the work is stable, there is no contact, the service life is long, the transmission efficiency is high, and the optical coupler is widely applied to switch circuits.

[0073] In the embodiment of the application, the optical coupler U1 is used to generate a detection signal, when the first power supply and the second power supply are connected in parallel, the voltage difference between the negative poles of the two power supplies is small, the voltage difference between the positive input end and the negative input end of the optical coupler U1 is small, the optical coupler U1 is not conductive, and the voltage detection module 12 outputs a high level; when the first power supply and the second power supply are connected in parallel, the voltage difference between the negative poles of the two power supplies is relatively large, the optical coupler U1 is conductive, and the voltage detection module 12 outputs a low level, so that the detection of the series-parallel relationship of the two power supplies is realized. The above-mentioned circuit has a simple circuit structure, the optical coupler U1 has strong anti-interference ability before and after isolation, the work is stable, and the detection of the series-parallel relationship of the power supply is realized by using the simplest circuit.

[0074] Meanwhile, in the embodiment of the application, voltage matching is performed by the voltage acquisition module 11, so that the obtained voltage difference meets the voltage requirement of the input end of the optical coupler U1.

[0075] In a possible implementation manner, referring to Figure 3 , the voltage detection module 12 can further include a zener diode VD1.

[0076] The cathode of the zener diode VD1 is connected with the positive input end of the optical coupler U1, and the anode of the zener diode VD1 is connected with the negative input end of the optical coupler U1.

[0077] In the embodiment of the application, the zener diode VD1 is further arranged, the voltage of the input end of the optical coupler U1 is stabilized, the large voltage interference introduced by the input end of the optical coupler U1 is avoided, the optical coupler U1 is prevented from being damaged, and the stability and reliability of the circuit are effectively improved.

[0078] In a possible implementation, referring to Figure 3 , the voltage detection module 12 can further include a first capacitor C1 and a second capacitor C2.

[0079] The first capacitor C1 is connected in parallel with the fourth resistor R4.

[0080] The first end of the second capacitor C2 is connected with the positive output end of the optocoupler U1, and the second end of the second capacitor C2 is grounded.

[0081] The first capacitor C1 and the second capacitor C2 are used for filtering, and the reliability of the circuit is improved.

[0082] In the above embodiment, the master control module can include a single-chip microcomputer, and the single-chip microcomputer determines whether the first power supply and the second power supply are connected in series or in parallel according to the detection signal, which is not described herein again.

[0083] In a possible implementation, referring to Figure 4 and Figure 5 , the power supply system can further include two series-parallel shorting rows.

[0084] The positive pole of the first power supply DC1 is connected with the positive output end DC+ of the power supply system, and the negative pole of the first power supply DC1 is connected with the neutral end N of the power supply system.

[0085] The positive pole of the second power supply DC2 is vacant, and the second end of the second power supply DC2 is connected with the negative output end DC- of the power supply system.

[0086] One of the two series-parallel shorting rows is connected between the negative pole of the first power supply DC1 and the positive pole of the second power supply DC2, and then the first power supply DC1 and the second power supply DC2 are connected in series.

[0087] One of the two series-parallel shorting rows is connected between the positive pole of the first power supply DC1 and the positive pole of the second power supply DC2, and the other is connected between the negative pole of the first power supply DC1 and the negative pole of the second power supply DC2, and then the first power supply DC1 and the second power supply DC2 are connected in parallel.

[0088] The power supply system in the embodiment of the application further includes two series-parallel shorting rows, and the series-parallel relationship between the first power supply DC1 and the second power supply DC2 is quickly switched through the two series-parallel shorting rows. Figure 4 , the positive pole of the second power supply DC2 is vacant, and when one of the series-parallel shorting rows is connected between the negative pole of the first power supply DC1 and the positive pole of the second power supply DC2, the negative pole of the first power supply DC1 and the positive pole of the second power supply DC2 are shorted, the first power supply DC1 and the second power supply DC2 are connected in series, and the voltage of the two power supplies connected in series is output through the positive output end DC+ and the negative output end DC- of the power supply system.

[0089] Similarly, since the positive electrode of the second power supply DC2 is vacant, and the negative electrode of the first power supply DC1 is connected with the neutral end N of the power supply system, therefore, referring to Figure 5 A first string-parallel shorting row can be used to short the positive electrode of the first power supply DC1 and the positive electrode of the second power supply DC2, a second string-parallel shorting row can be used to short the negative electrode of the first power supply DC1 and the negative electrode of the second power supply DC2, and the voltage of the two parallel power supplies can be output through the positive output end DC+ of the power supply system and the negative output end DC- of the power supply system.

[0090] In the embodiment of the present application, the fast switching of the series-parallel relationship of the two power supplies can be realized through only two string-parallel shorting rows, without modifying the wiring, which is fast and simple, so that the power supply system can output different voltages to meet the requirements of different application scenarios, and the adaptability of the power supply system is improved.

[0091] Note that at this time, the neutral end N of the power supply system cannot be externally connected.

[0092] In a possible implementation, referring to Figure 4 and Figure 5 The power supply system can further include a first connecting line L1, a second connecting line L2, a third connecting line L3, and a fourth connecting line L4.

[0093] The positive electrode of the first power supply DC1 is connected with the positive output end DC+ of the power supply system through the first connecting line L1.

[0094] The positive electrode of the second power supply DC2 is connected with the second connecting line L2.

[0095] The negative electrode of the first power supply DC1 is connected with the neutral end N of the power supply system through the third connecting line L3.

[0096] The negative electrode of the second power supply DC2 is connected with the negative output end DC- of the power supply system through the fourth connecting line L4.

[0097] One string-parallel shorting row is overlapped between the second connecting line L2 and the third connecting line L3, so that the first power supply DC1 and the second power supply DC2 are connected in series; or

[0098] One string-parallel shorting row is overlapped between the first connecting line L1 and the second connecting line L2, and another string-parallel shorting row is overlapped between the third connecting line L3 and the fourth connecting line L4, so that the first power supply DC1 and the second power supply DC2 are connected in parallel.

[0099] Specifically, in the embodiment of the present application, four connecting lines can be provided to realize the connection between the electrodes of the power supply and the terminals of the power supply system, and the connecting terminals are led out to facilitate the overlapping of the string-parallel shorting rows.

[0100] In a possible implementation, referring to Figure 6 andFigure 7 The number of the first power supply DC1 can be at least one, the number of the second power supply DC2 can be at least one, and the number of the first power supply DC1 is the same as the number of the second power supply DC2;

[0101] The positive pole of each first power supply DC1 is connected with the first connecting line L1, and the negative pole of each first power supply DC1 is connected with the third connecting line L3;

[0102] The positive pole of each second power supply DC2 is connected with the second connecting line L2, and the negative pole of each second power supply DC2 is connected with the fourth connecting line L4;

[0103] One string-parallel short-circuiting row is connected between the second connecting line L2 and the third connecting line L3, and each first power supply DC1 is connected in series with the corresponding second power supply DC2; or

[0104] One string-parallel short-circuiting row is connected between the first connecting line L1 and the second connecting line L2, and another string-parallel short-circuiting row is connected between the third connecting line L3 and the fourth connecting line L4, and each first power supply DC1 is connected in parallel with the corresponding second power supply DC2.

[0105] In the embodiment of the application, the first power supply DC1 and the second power supply DC2 can both be multiple. Each first power supply DC1 is connected in parallel, and each second power supply DC2 is also connected in parallel. The parallel connection of each power supply is realized through the four connecting lines (L1, L2, L3 and L4), and the series connection or parallel connection of the power supply is realized by connecting the string-parallel short-circuiting rows between the four connecting lines, so that the output of different voltages is realized, and the power supply system can meet different application requirements.

[0106] In a possible implementation manner, referring to Figure 6 and Figure 7 The first connecting line L1, the second connecting line L2, the third connecting line L3 and the fourth connecting line L4 can be arranged side by side in sequence.

[0107] Specifically, the four connecting lines (L1, L2, L3 and L4) can be arranged side by side in sequence, which facilitates the connection of the string-parallel short-circuiting rows, avoids the cross-connection of the connecting lines, and meets the insulation requirements. For example, referring to Figure 6 When one string-parallel short-circuiting row is connected on the middle two connecting lines, the first power supply DC1 and the second power supply DC2 are connected in series; referring to Figure 7 When two string-parallel short-circuiting rows are connected between the first connecting line L1 and the second connecting line L2 and between the third connecting line L3 and the fourth connecting line L4 respectively, the first power supply DC1 and the second power supply DC2 are connected in parallel, and the cross-connection of the connecting lines does not occur, which facilitates the wiring and does not cause a short-circuit fault, thereby improving the safety of the power supply system.

[0108] Furthermore, referring toFigure 6 and Figure 7 The first power supply DC1 and the second power supply DC2 can be generated by the same lithium battery group, and the lithium battery group outputs two paths of 240V through a DCDC converter, and the two paths are respectively the first power supply DC1 and the second power supply DC2.

[0109] Specifically, the first power supply DC1 and the second power supply DC2 can also be obtained by different power supply modules (for example, lithium battery groups) in series and in parallel, and the connection relationship of each power supply module in the first power supply DC1 and the second power supply DC2 is not limited and can be different, and the output voltages of the two are the same.

[0110] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A lithium battery power source connection relationship detection circuit, characterized by, The first power supply and the second power supply are connected in series or in parallel to form a power supply system; the detection circuit is used for detecting the series-parallel relationship between the first power supply and the second power supply; wherein the series-parallel relationship between the first power supply and the second power supply is switchable; when the first power supply and the second power supply are connected in series, the positive electrode of the first power supply is connected with the positive output end of the power supply system, the negative electrode of the first power supply is connected with the positive electrode of the second power supply, and the negative electrode of the second power supply is connected with the negative output end of the power supply system; the detection circuit comprises a voltage acquisition module, a voltage detection module and a main control module; the first input end of the voltage acquisition module is used for being connected with the negative electrode of the first power supply, the second input end of the voltage acquisition module is used for being connected with the negative electrode of the second power supply, and the output end of the voltage acquisition module is connected with the input end of the voltage detection module; the output end of the voltage detection module is connected with the main control module; the main control module is used for receiving the detection signal output by the output end of the voltage detection module, and determining the series-parallel relationship between the first power supply and the second power supply according to the detection signal.

2. The lithium battery power connection relationship detection circuit according to claim 1, characterized in that, the input end of the voltage detection module comprises a first voltage input end and a second voltage input end; wherein the first voltage input end is connected with the output end of the voltage acquisition module, and the second voltage input end is connected with the second input end of the voltage acquisition module; the voltage acquisition module comprises a first resistor and a second resistor; the first end of the first resistor is connected with the first input end of the voltage acquisition module, and the second end of the first resistor is respectively connected with the first end of the second resistor and the output end of the voltage acquisition module; the second end of the second resistor is connected with the second input end of the voltage acquisition module.

3. The lithium battery power connection relationship detection circuit according to claim 2, characterized in that, the voltage detection module comprises an optocoupler, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; the positive input end of the optocoupler is respectively connected with the first end of the third resistor and the first end of the fourth resistor, the negative input end of the optocoupler is respectively connected with the second end of the fourth resistor and the first end of the fifth resistor, the positive output end of the optocoupler is respectively connected with the first end of the sixth resistor and the output end of the voltage detection module, and the negative output end of the optocoupler is grounded; the second end of the third resistor is connected with the first voltage input end of the voltage detection module; the second end of the fifth resistor is connected with the second voltage input end of the voltage detection module; the second end of the sixth resistor is connected with a direct current power supply.

4. The lithium battery power connection relationship detection circuit according to claim 3, characterized in that, the voltage detection module further comprises a voltage stabilizing diode; the cathode of the voltage stabilizing diode is connected with the positive input end of the optocoupler, and the anode of the voltage stabilizing diode is connected with the negative input end of the optocoupler.

5. The lithium battery power connection relationship detection circuit according to claim 3, characterized in that, the voltage detection module further comprises a first capacitor and a second capacitor; the first capacitor is connected in parallel with the fourth resistor; the first end of the second capacitor is connected with the positive output end of the optocoupler, and the second end of the second capacitor is grounded.

6. The lithium battery power connection relationship detection circuit according to any one of claims 1 to 5, characterized in that, the power supply system further comprises two series-parallel shorting rows; The positive pole of the first power supply is connected with the positive output end of the power supply system, and the negative pole of the first power supply is connected with the neutral line end of the power supply system; The positive pole of the second power supply is vacant, and the second end of the second power supply is connected with the negative output end of the power supply system; One string-parallel-short-circuit row is connected between the negative pole of the first power supply and the positive pole of the second power supply, and the first power supply and the second power supply are connected in series; or One string-parallel-short-circuit row is connected between the positive pole of the first power supply and the positive pole of the second power supply, and another string-parallel-short-circuit row is connected between the negative pole of the first power supply and the negative pole of the second power supply, and the first power supply and the second power supply are connected in parallel.

7. The lithium battery power connection relationship detection circuit according to claim 6, characterized in that, The power supply system further comprises a first connecting line, a second connecting line, a third connecting line and a fourth connecting line; The positive pole of the first power supply is connected with the positive output end of the power supply system through the first connecting line; The positive pole of the second power supply is connected with the second connecting line; The negative pole of the first power supply is connected with the neutral line end of the power supply system through the third connecting line; The negative pole of the second power supply is connected with the negative output end of the power supply system through the fourth connecting line; One string-parallel-short-circuit row is connected between the second connecting line and the third connecting line, and the first power supply and the second power supply are connected in series; or One string-parallel-short-circuit row is connected between the first connecting line and the second connecting line, and another string-parallel-short-circuit row is connected between the third connecting line and the fourth connecting line, and the first power supply and the second power supply are connected in parallel.

8. The lithium battery power connection relationship detection circuit according to claim 7, characterized in that, The number of the first power supply is at least one, the number of the second power supply is at least one, and the number of the first power supply is the same as the number of the second power supply; The positive pole of each first power supply is connected with the first connecting line, and the negative pole of each first power supply is connected with the third connecting line; The positive pole of each second power supply is connected with the second connecting line, and the negative pole of each second power supply is connected with the fourth connecting line; One string-parallel-short-circuit row is connected between the second connecting line and the third connecting line, and each first power supply is connected in series with a corresponding second power supply; or One string-parallel-short-circuit row is connected between the first connecting line and the second connecting line, and another string-parallel-short-circuit row is connected between the third connecting line and the fourth connecting line, and each first power supply is connected in parallel with a corresponding second power supply.

9. The lithium battery power connection relationship detection circuit according to claim 8, characterized in that, The first connecting line, the second connecting line, the third connecting line and the fourth connecting line are arranged in sequence and side by side.

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