Power supply device

Abstract

The utility model relates to the technical field of batteries, in particular to a power supply device which comprises a first battery module, a second battery module, a control module and a switching module, and the second battery module and the first battery module are connected in parallel; the control module can detect the voltage of the first battery module and the voltage of the second battery module; the switching module is respectively connected with the first battery module, the second battery module, the control module and the load module, and responds to the first control signal to control the first battery module to charge the second battery module; the switching module responds to the second control signal to control the second battery module to charge the first battery module. Circulating current in the power supply device can be suppressed to at least a certain extent.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power supply, and in particular to a power supply device. Background Art

[0002] With the development and progress of technology, more and more equipment uses pure electric systems as their power devices. In order to increase the current in some electrical equipment, parallel battery packs are usually used as power devices. In practical applications, due to the different working cycles and aging degrees of different battery packs in electrical equipment, circulating currents will be formed between parallel battery packs.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] An object of the present disclosure is to provide a power supply device, thereby suppressing circulating current in the power supply device at least to a certain extent.

[0005] The present disclosure provides a power supply device, the power supply device comprising:

[0006] a first battery module;

[0007] a second battery module, the second battery module being connected in parallel with the first battery module;

[0008] a control module, wherein the control module is capable of detecting the voltage of the first battery module and the voltage of the second battery module, and when the voltage of the first battery module is greater than the voltage of the second battery module, and the difference between the voltage of the first battery module and the voltage of the second battery module is greater than a first preset threshold, the control module outputs a first control signal, and when the voltage of the second battery module is greater than the voltage of the first battery module, and the difference between the voltage of the second battery module and the voltage of the first battery module is greater than the first preset threshold, the control module outputs a second control signal;

[0009] A switching module, wherein the switching module respectively connects the first battery module, the second battery module, the control module and the load module, the switching module controls the first battery module to charge the second battery module in response to the first control signal, and the switching module controls the second battery module to charge the first battery module in response to the second control signal.

[0010] According to an embodiment of the present disclosure, the switching module includes:

[0011] Switch module;

[0012] A pre-charging resistor, the pre-charging resistor connecting the switch module and the load module;

[0013] The control module is also used to output a pre-charge signal and a working signal. The switch controls the first battery module and / or the second battery module to supply power to the pre-charge resistor in response to the pre-charge signal. The switch module supplies power to the load module in response to the working signal.

[0014] According to one embodiment of the present disclosure, the switch module includes:

[0015] a first switch, wherein the first switch connects the first battery module and the load module;

[0016] a second switch, the second switch connecting the second battery module and the load module;

[0017] a third switch, the third switch connecting the first battery module and the pre-charging resistor;

[0018] a fourth switch, wherein the fourth switch connects the second battery module and the load module;

[0019] The second switch and the third switch are turned on in response to the first control signal, the first switch and the fourth switch are turned off in response to the first control signal, the first switch and the fourth switch are turned on in response to the second control signal, and the second switch and the third switch are turned off in response to the second control signal.

[0020] According to an embodiment of the present disclosure, the third switch and / or the fourth switch is turned on in response to the pre-charge signal, and the first switch and the second switch are turned off in response to the pre-charge signal;

[0021] The third switch and the fourth switch are turned off in response to the working signal, and the first switch and / or the second switch are turned on in response to the working signal.

[0022] According to one embodiment of the present disclosure, the switch module includes:

[0023] a fifth switch, wherein the fifth switch connects the first battery module and the load module;

[0024] a sixth switch, the sixth switch connecting the second battery module and the load module;

[0025] a first diode, wherein the first diode is connected to the first battery module and the pre-charging resistor;

[0026] a second diode, wherein the second diode is connected between the second battery module and the pre-charging resistor;

[0027] The fifth switch is turned off in response to the first control signal, the sixth switch is turned on in response to the first control signal, the fifth switch is turned on in response to the second control signal, and the sixth switch is turned off in response to the second control signal.

[0028] According to an embodiment of the present disclosure, the fifth switch and the sixth switch are turned off in response to the pre-charge signal, and the fifth switch and / or the sixth switch are turned on in response to the working signal.

[0029] According to one embodiment of the present disclosure, the power supply device further includes:

[0030] A discharge switch is connected to the switching module and the load module, and the discharge switch is turned off in response to the first control signal or the second control signal.

[0031] According to one embodiment of the present disclosure, the first battery module includes:

[0032] a first battery pack;

[0033] A first manual maintenance switch, wherein the first manual maintenance switch is disposed between the first battery pack and the switching module;

[0034] The second battery module comprises:

[0035] A second battery pack;

[0036] A second manual maintenance switch is provided between the second battery pack and the switching module.

[0037] According to one embodiment of the present disclosure, the first battery module further includes:

[0038] A first current sensor, wherein the first current sensor and the first battery pack are connected in series;

[0039] The second battery module further includes:

[0040] A second current sensor is connected in series with the second battery pack.

[0041] According to an embodiment of the present disclosure, the first manual maintenance switch is connected to the positive electrode of the first battery pack, and the first current sensor is connected to the negative electrode of the first battery pack;

[0042] The second manual maintenance switch is connected to the positive electrode of the second battery pack, and the second current sensor is connected to the negative electrode of the second battery pack.

[0043] In the power supply device provided by the embodiment of the present disclosure, the second battery module and the first battery module are connected in parallel. When the voltage of the first battery module is greater than the voltage of the second battery module, and the difference between the voltage of the first battery module and the voltage of the second battery module is greater than the first preset threshold, the control module outputs a first control signal. When the voltage of the second battery module is greater than the voltage of the first battery module, and the difference between the voltage of the second battery module and the voltage of the first battery module is greater than the first preset threshold, the control module outputs a second control signal. The switching module controls the first battery module to charge the second battery module in response to the first control signal. The switching module controls the second battery module to charge the first battery module in response to the second control signal. The voltage balance of the first battery module and the second battery module is achieved through the control module and the switching module, thereby suppressing the circulation between the first battery module and the second battery module connected in parallel.

[0044] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0046] Figure 1 A schematic diagram of a first power supply device provided for an exemplary embodiment of the present disclosure;

[0047] Figure 2 A schematic diagram of a second power supply device provided for an exemplary embodiment of the present disclosure;

[0048] Figure 3 A schematic diagram of a third power supply device provided by an exemplary embodiment of the present disclosure.

[0049] 110, first battery module; 120, second battery module; 130, switching module; 131, switch module; 140, control module; 150, discharge switch; 210, load module;

[0050] D1, first battery pack; MSD1, first manual maintenance switch; H1, first current sensor; D2, second battery pack; MSD2, second manual maintenance switch; H2, second current sensor; R1, pre-charging resistor; MK1, first switch; MK2, second switch; MK3, third switch; MK4, fourth switch; MK5, fifth switch; MK6, sixth switch; VD1, first diode; VD2, second diode. DETAILED DESCRIPTION

[0051] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0052] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0053] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0054] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0055] The exemplary embodiments of the present disclosure provide a power supply device, such as Figure 1As shown, the power supply device includes: a first battery module 110, a second battery module 120, a control module 140 and a switching module 130, the second battery module 120 and the first battery module 110 are connected in parallel; the control module 140 can detect the voltage of the first battery module 110 and the voltage of the second battery module 120, when the voltage of the first battery module 110 is greater than the voltage of the second battery module 120, and the difference between the voltage of the first battery module 110 and the voltage of the second battery module 120 is greater than a first preset threshold value, the control module 140 outputs a first control signal, when the second battery module 1 20 is greater than the voltage of the first battery module 110, and the difference between the voltage of the second battery module 120 and the voltage of the first battery module 110 is greater than the first preset threshold, the control module 140 outputs a second control signal; the first battery module 110, the second battery module 120, the control module 140 and the load module 210 are switched to be connected respectively, the switching module 130 controls the first battery module 110 to charge the second battery module 120 in response to the first control signal, and the switching module 130 controls the second battery module 120 to charge the first battery module 110 in response to the second control signal.

[0056] In the power supply device provided by the embodiment of the present disclosure, the second battery module 120 and the first battery module 110 are connected in parallel. When the voltage of the first battery module 110 is greater than the voltage of the second battery module 120, and the difference between the voltage of the first battery module 110 and the voltage of the second battery module 120 is greater than the first preset threshold, the control module 140 outputs a first control signal. When the voltage of the second battery module 120 is greater than the voltage of the first battery module 110, and the difference between the voltage of the second battery module 120 and the voltage of the first battery module 110 is greater than the first preset threshold, the control module 140 outputs a second control signal. The switching module 130 controls the first battery module 110 to charge the second battery module 120 in response to the first control signal. The switching module 130 controls the second battery module 120 to charge the first battery module 110 in response to the second control signal. The voltage balance of the first battery module 110 and the second battery module 120 is achieved through the control module 140 and the switching module 130, thereby suppressing the circulation between the first battery module 110 and the second battery module 120 connected in parallel.

[0057] Furthermore, the power supply device provided in the embodiment of the present disclosure further includes a discharge switch 150, the discharge switch 150 connects the switching module 130 and the load module 210, and the discharge switch 150 is turned off in response to the first control signal or the second control signal. The load module 210 is disconnected by the discharge switch 150 to prevent the load module 210 from affecting the balancing process of the first battery module 110 and the second module, and the power supply device can be controlled not to discharge the load module 210 when the balancing is not completed.

[0058] The following is a detailed description of each part of the power supply device provided in the embodiment of the present disclosure:

[0059] like Figure 2 As shown, the first battery module 110 includes a first battery pack D1, a first manual maintenance switch MSD1 and a first current sensor H1, wherein the first manual maintenance switch MSD1 is disposed between the first battery pack D1 and the switching module 130; the first current sensor H1 and the first battery pack D1 are connected in series, and the first current sensor H1 is used to detect the current of the first battery module 110. For example, the first manual maintenance switch MSD1 is connected to the positive electrode of the first battery pack D1, and the first current sensor H1 is connected to the negative electrode of the first battery pack D1.

[0060] Among them, the first battery pack D1 includes at least one single battery. When the first battery pack D1 includes multiple single batteries, the multiple single batteries can be connected in parallel or in series. The first battery pack D1 can be in the form of a battery pack, a battery module or a single battery. The first current sensor H1 can be a Hall sensor. The first manual maintenance switch MSD1 is a high-voltage connector with a fuse. In order to ensure the safety of people and vehicles during the maintenance of high-voltage electrical equipment, the power supply of the high-voltage system is disconnected by unplugging the MSD. It can achieve electrical isolation of the high-voltage system and also play a role in short-circuit protection.

[0061] The second battery module 120 includes a second battery pack D2, a second manual maintenance switch MSD2, and a second current sensor H2, wherein the second manual maintenance switch MSD2 is disposed between the second battery pack D2 and the switching module 130. The second current sensor H2 is connected in series with the second battery pack D2, and the first current sensor H1 is used to detect the current of the first battery module 110. For example, the second manual maintenance switch MSD2 is connected to the positive electrode of the second battery pack D2, and the second current sensor H2 is connected to the negative electrode of the second battery pack D2.

[0062] Among them, the second battery pack D2 includes at least one single battery. When the second battery pack D2 includes multiple single batteries, the multiple single batteries can be connected in parallel or in series. The second battery pack D2 can be in the form of a battery pack, a battery module or a single battery. The second current sensor H2 can be a Hall sensor. The second manual maintenance switch MSD2 is a high-voltage connector with a fuse. In order to ensure the safety of people and vehicles during the maintenance of high-voltage electrical equipment, the power supply of the high-voltage system is disconnected by unplugging the MSD. It can achieve electrical isolation of the high-voltage system and also play a role in short-circuit protection.

[0063] It should be noted that, in an ideal state, in the embodiment of the present disclosure, the first battery pack D1 and the second battery pack D2 are the same. However, in actual applications, due to manufacturing errors, or different working cycles and aging degrees, there will be a pressure difference between the first battery pack D1 and the second battery pack D2, and this pressure difference will generate a circulating current when the power supply device is working. In the embodiment of the present disclosure, the control module 140 and the switching module 130 are used to suppress the circulating current of the first battery pack D1 and the second battery pack D2.

[0064] The power supply device provided in the embodiment of the present disclosure has multiple working stages such as a balancing mode, a pre-charging mode and a working mode. In the balancing mode, the control module 140 controls the switching module 130 to balance the voltages of the first battery pack D1 and the second battery pack D2. In the pre-charging mode, the control module 140 controls the switching module 130 to pre-charge the load. In the working mode, the control module 140 controls the first battery pack D1 and / or the second battery pack D2 to supply power to the load.

[0065] In the balancing mode, the control module 140 can detect and obtain the voltage of the first battery module 110 and the voltage of the second battery module 120. When the voltage of the first battery module 110 is greater than the voltage of the second battery module 120, and the difference between the voltage of the first battery module 110 and the voltage of the second battery module 120 is greater than the first preset threshold, the control module 140 outputs a first control signal; when the voltage of the first battery module 110 is greater than the voltage of the second battery module 120, and the difference between the voltage of the first battery module 110 and the voltage of the second battery module 120 is less than the second preset threshold, the control module 140 outputs a third control signal. When the voltage of the second battery module 120 is greater than the voltage of the first battery module 110, and the difference between the voltage of the second battery module 120 and the voltage of the first battery module 110 is greater than the first preset threshold, the control module 140 outputs a second control signal. When the voltage of the second battery module 120 is greater than the voltage of the first battery module 110 and the difference between the voltage of the second battery module 120 and the voltage of the first battery module 110 is less than a second preset threshold, the control module 140 outputs a fourth control signal. The second preset threshold is less than the first preset threshold.

[0066] The switch module 130 controls the first battery module 110 to charge the second battery module 120 in response to the first control signal, and the switch module 130 stops the first battery module 110 from charging the second battery module 120 in response to the third control signal. The switch module 130 controls the second battery module 120 to charge the first battery module 110 in response to the second control signal, and the switch module 130 stops the second battery module 120 from charging the first battery module 110 in response to the third control signal.

[0067] The switching module 130 includes a switch module 131 and a pre-charging resistor R1, which connects the switch module 131 and the load module 210; the pre-charging resistor R1 is used to limit the current in the balancing mode and the pre-charging mode to avoid excessive current during balancing and pre-charging to damage the battery or the load module 210.

[0068] In the balancing mode, the switch module 131 controls the first battery module 110 to charge the second battery module 120 in response to the first control signal, and controls the second battery module 120 to charge the first battery module 110 in response to the second control signal. In the pre-charging mode, the switch module 131 controls the first battery module 110 and / or the second battery module 120 to supply power to the pre-charging resistor R1 in response to the pre-charging signal. In the working mode, the switch module 131 supplies power to the load module 210 in response to the working signal.

[0069] In a possible implementation, if Figure 2 As shown, the switch module 131 includes a first switch MK1, a second switch MK2, a third switch MK3 and a fourth switch MK4. The first switch MK1 connects the first battery module 110 and the load module 210; the second switch MK2 connects the second battery module 120 and the load module 210; the third switch MK3 connects the first battery module 110 and the pre-charging resistor R1; and the fourth switch MK4 connects the second battery module 120 and the load module 210.

[0070] In the balanced mode, the second switch MK2 and the third switch MK3 are turned on in response to the first control signal, and the second switch MK2 and the third switch MK3 are turned off in response to the third control signal, and the first switch MK1 and the fourth switch MK4 are turned off in response to the first control signal. The first switch MK1 and the fourth switch MK4 are turned on in response to the second control signal, and the first switch MK1 and the fourth switch MK4 are turned off in response to the fourth control signal, and the second switch MK2 and the third switch MK3 are turned off in response to the second control signal.

[0071] In the pre-charge mode, the third switch MK3 and / or the fourth switch MK4 are turned on in response to the pre-charge signal, and the first switch MK1 and the second switch MK2 are turned off in response to the pre-charge signal. In the working mode, the third switch MK3 and the fourth switch MK4 are turned off in response to the working signal, and the first switch MK1 and / or the second switch MK2 are turned on in response to the working signal.

[0072] The first switch MK1, the second switch MK2, the third switch MK3, the fourth switch MK4 and the discharge switch 150 are all contactors. The first end of the first switch MK1 is connected to the first manual maintenance switch MSD1, the second end of the first switch MK1 is connected to the first end of the discharge switch 150, and the control end of the first switch MK1 is connected to the control module 140. The first end of the second switch MK2 is connected to the second manual maintenance switch MSD2, the second end of the second switch MK2 is connected to the first end of the discharge switch 150, and the control end of the second switch MK2 is connected to the control module 140. The first end of the third switch MK3 is connected to the first manual maintenance switch MSD1, the second end of the third switch MK3 is connected to the first end of the pre-charging resistor R1, and the control end of the third switch MK3 is connected to the control module 140. The first end of the fourth switch MK4 is connected to the second manual maintenance switch MSD2, the second end of the fourth switch MK4 is connected to the first end of the pre-charging resistor R1, and the control end of the fourth switch MK4 is connected to the control module 140. The second end of the pre-charging resistor R1 is connected to the first end of the discharge switch 150.

[0073] For example, in the balancing mode, the control module 140 collects the voltage U1 of the first battery module 110 and the voltage U2 of the second battery module 120. When U1-U2≥A, the control module 140 controls the third switch MK3 and the second switch MK2 to be turned on to balance the branches. When U1-U2≤B, it is considered that the balancing between the branches is completed; the control module 140 controls the second switch MK2 and the third switch MK3 to be turned off;

[0074] The control module 140 collects the voltage U1 of the first battery module 110 and the voltage U2 of the second battery module 120. When U2-U1≥A, the control module 140 controls the first switch MK1 and the fourth switch MK4 to be turned on to balance the branches. When U2-U1≤B, it is considered that the balance between the branches is completed; the control module 140 controls the first switch MK1 and the fourth switch MK4 to be turned off;

[0075] After completing the balancing of the two-branch power battery modules, the power supply device can enter the pre-charging mode, first close the discharge switch 150, and then close the third switch MK3 and / or the fourth switch MK4 to pre-charge the rear-end capacitive load. When the voltage of the load module 210 reaches 0.95 times the voltage of the first battery module 110 or the second battery module 120, the pre-charging is considered to be completed. In the working mode, close the first switch MK1 and / or the second switch MK2, and use the power battery pack of the first battery module 110 and / or the second battery module 120 to discharge the system.

[0076] In another feasible embodiment of the present disclosure, Figure 3As shown, the switch module 131 includes a fifth switch MK5, a sixth switch MK6, a first diode VD1 and a second diode VD2. The fifth switch MK5 connects the first battery module 110 and the load module 210; the sixth switch MK6 connects the second battery module 120 and the load module 210; the first diode VD1 connects the first battery module 110 and the pre-charge resistor R1; the second diode VD2 connects the second battery module 120 and the pre-charge resistor R1. By using power diodes, the circuit control complexity is further simplified, and the reliability and performance of the power system are guaranteed.

[0077] In the balanced mode, the fifth switch MK5 is turned off in response to the first control signal, the sixth switch MK6 is turned on in response to the first control signal, the fifth switch MK5 is turned on in response to the second control signal, and the sixth switch MK6 is turned off in response to the second control signal. The fifth switch MK5 and the sixth switch MK6 are turned off at the same time in response to the third control signal; the fifth switch MK5 and the sixth switch MK6 are turned off at the same time in response to the fourth control signal.

[0078] In the pre-charge mode, the fifth switch MK5 and the sixth switch MK6 are turned off in response to the pre-charge signal. In the working mode, the fifth switch MK5 and / or the sixth switch MK6 are turned on in response to the working signal.

[0079] The fifth switch MK5, the sixth switch MK6 and the discharge switch 150 are all contactors, and the first diode VD1 and the second diode VD2 are power diodes. The first end of the fifth switch MK5 is connected to the first manual maintenance switch MSD1, the second end of the fifth switch MK5 is connected to the first end of the discharge switch 150, and the control end of the fifth switch MK5 is connected to the control module 140. The first end of the sixth switch MK6 is connected to the second manual maintenance switch MSD2, the second end of the sixth switch MK6 is connected to the first end of the discharge switch 150, and the control end of the sixth switch MK6 is connected to the control module 140. The first diode VD1 is connected between the first manual maintenance switch MSD1 and the pre-charging resistor R1, and the second diode VD2 is connected between the second manual maintenance switch MSD2 and the pre-charging resistor R1.

[0080] For example, in the balancing mode, the control module 140 collects the voltage U1 of the first battery module 110 and the voltage U2 of the second battery module 120. When U1-U2≥A, the control module 140 controls the sixth switch MK6 to balance the branches. When U1-U2≤B, it is considered that the balancing between the branches is completed; the control module 140 controls to turn off the second switch MK2 and the third switch MK3;

[0081] The control module 140 collects the voltage U1 of the first battery module 110 and the voltage U2 of the second battery module 120. When U2-U1≥A, the control module 140 controls the fifth switch MK5 to turn on to balance the branches. When U2-U1≤B, it is considered that the balance between the branches is completed; the control module 140 controls the first switch MK1 and the fourth switch MK4 to turn off;

[0082] After completing the balancing of the two-branch power battery modules, the power supply device can enter the pre-charging mode, first close the discharge switch 150, and then close the third switch MK3 and / or the fourth switch MK4 to pre-charge the rear-end capacitive load. When the voltage of the load module 210 reaches 0.95 times the voltage of the first battery module 110 or the second battery module 120, the pre-charging is considered to be completed. In the working mode, close the fifth switch MK5 and / or the sixth switch MK6, and use the power battery pack of the first battery module 110 and / or the second battery module 120 to discharge the system.

[0083] In the power supply device provided by the embodiment of the present disclosure, the second battery module 120 and the first battery module 110 are connected in parallel. When the voltage of the first battery module 110 is greater than the voltage of the second battery module 120, and the difference between the voltage of the first battery module 110 and the voltage of the second battery module 120 is greater than the first preset threshold, the control module 140 outputs a first control signal. When the voltage of the second battery module 120 is greater than the voltage of the first battery module 110, and the difference between the voltage of the second battery module 120 and the voltage of the first battery module 110 is greater than the first preset threshold, the control module 140 outputs a second control signal. The switching module 130 controls the first battery module 110 to charge the second battery module 120 in response to the first control signal. The switching module 130 controls the second battery module 120 to charge the first battery module 110 in response to the second control signal. The voltage balance of the first battery module 110 and the second battery module 120 is achieved through the control module 140 and the switching module 130, thereby suppressing the circulation between the first battery module 110 and the second battery module 120 connected in parallel. While meeting the pre-charging requirements of the rear-end capacitive load, it can solve the circulation problem caused by voltage imbalance between branches and ensure the reliability and performance of the power system.

[0084] Furthermore, the first battery module 110 and the second battery module 120 in the power supply device provided by the embodiment of the present disclosure share a pre-charging resistor R1. Compared with the traditional dual-branch circuit, while satisfying the requirement that the dual branches can operate independently, the use of electrical components can be reduced, the weight and cost of the power system can be reduced, and the complexity of circuit control can be simplified. It can realize that a single branch can independently provide power for the device, and it can also realize that the dual branches can simultaneously provide power for the device, thereby ensuring the safety and reliability of the device operation.

[0085] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A power supply device, characterized in that: The power supply device comprises: a first battery module; a second battery module, the second battery module being connected in parallel with the first battery module; a control module, wherein the control module is capable of detecting the voltage of the first battery module and the voltage of the second battery module, and when the voltage of the first battery module is greater than the voltage of the second battery module, and the difference between the voltage of the first battery module and the voltage of the second battery module is greater than a first preset threshold, the control module outputs a first control signal, and when the voltage of the second battery module is greater than the voltage of the first battery module, and the difference between the voltage of the second battery module and the voltage of the first battery module is greater than the first preset threshold, the control module outputs a second control signal; A switching module, wherein the switching module respectively connects the first battery module, the second battery module, the control module and the load module, the switching module controls the first battery module to charge the second battery module in response to the first control signal, and the switching module controls the second battery module to charge the first battery module in response to the second control signal.

2. The power supply device according to claim 1, characterized in that: The switching module comprises: Switch module; A pre-charging resistor, the pre-charging resistor connecting the switch module and the load module; The control module is also used to output a pre-charge signal and a working signal. The switch module controls the first battery module and / or the second battery module to supply power to the pre-charge resistor in response to the pre-charge signal. The switch module supplies power to the load module in response to the working signal.

3. The power supply device according to claim 2, characterized in that: The switch module comprises: a first switch, wherein the first switch connects the first battery module and the load module; a second switch, the second switch connecting the second battery module and the load module; a third switch, the third switch connecting the first battery module and the pre-charging resistor; a fourth switch, wherein the fourth switch connects the second battery module and the load module; The second switch and the third switch are turned on in response to the first control signal, the first switch and the fourth switch are turned off in response to the first control signal, the first switch and the fourth switch are turned on in response to the second control signal, and the second switch and the third switch are turned off in response to the second control signal.

4. The power supply device according to claim 3, characterized in that: The third switch and / or the fourth switch is turned on in response to the pre-charge signal, and the first switch and the second switch are turned off in response to the pre-charge signal; The third switch and the fourth switch are turned off in response to the working signal, and the first switch and / or the second switch are turned on in response to the working signal.

5. The power supply device according to claim 2, characterized in that: The switch module comprises: a fifth switch, wherein the fifth switch connects the first battery module and the load module; a sixth switch, the sixth switch connecting the second battery module and the load module; a first diode, wherein the first diode is connected to the first battery module and the pre-charging resistor; a second diode, wherein the second diode is connected between the second battery module and the pre-charging resistor; The fifth switch is turned off in response to the first control signal, the sixth switch is turned on in response to the first control signal, the fifth switch is turned on in response to the second control signal, and the sixth switch is turned off in response to the second control signal.

6. The power supply device according to claim 5, characterized in that: The fifth switch and the sixth switch are turned off in response to the pre-charge signal, and the fifth switch and / or the sixth switch are turned on in response to the working signal.

7. The power supply device according to claim 1, characterized in that: The power supply device also includes: A discharge switch is connected to the switching module and the load module, and the discharge switch is turned off in response to the first control signal or the second control signal.

8. The power supply device according to claim 1, characterized in that: The first battery module comprises: a first battery pack; A first manual maintenance switch, wherein the first manual maintenance switch is disposed between the first battery pack and the switching module; The second battery module comprises: A second battery pack; A second manual maintenance switch is provided between the second battery pack and the switching module.

9. The power supply device according to claim 8, characterized in that: The first battery module further includes: A first current sensor, wherein the first current sensor and the first battery pack are connected in series; The second battery module further includes: A second current sensor is connected in series with the second battery pack.

10. The power supply device according to claim 9, characterized in that: The first manual maintenance switch is connected to the positive electrode of the first battery pack, and the first current sensor is connected to the negative electrode of the first battery pack; The second manual maintenance switch is connected to the positive electrode of the second battery pack, and the second current sensor is connected to the negative electrode of the second battery pack.

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