Power converter and energy storage device

Abstract

The utility model provides a power converter. The power converter comprises a power conversion circuit module, an input terminal, an output terminal and a printed circuit board (PCB). The power conversion circuit module comprises a first positive electrode circuit, a first negative electrode circuit, a first input bridge arm, a second input bridge arm, a power inductor and an output bridge arm, the first positive electrode circuit comprises a first wire, the first negative electrode circuit comprises a second wire, and the first wire and the second wire are overlapped on a projection plane perpendicular to the PCB. And at least part of the first wire or the second wire is not in contact with the PCB. According to the power converter provided by the invention, lamination of the positive electrode circuit and the negative electrode circuit of the power conversion circuit in the circuit board can be avoided.

Description

Technical Field

[0001] The present application relates to the field of power electronics, and in particular to a power converter and an energy storage device. Background Art

[0002] In recent years, with the rapid development of energy, photovoltaic and other industries, the power of high-power power converters has been continuously improved, which has put forward new requirements for the safety specifications of existing power converters. Taking the direct current (DC) / DC converter in the 48V smart lithium battery system as an example, it includes an H-bridge power conversion circuit, which can realize the functions of boosting, bucking, charging and discharging of smart batteries, among which the positive and negative poles of the input end of the H-bridge power conversion circuit are respectively used to connect to the positive and negative poles of the battery.

[0003] However, in the prior art, when the positive and negative electrodes at the input end of the power conversion circuit are respectively arranged in different layers on the circuit board, the circuits of the positive and negative electrodes may overlap on the projection plane perpendicular to the circuit board, which is a phenomenon of lamination. When a component on the circuit board fails and causes a small-scale fire, the insulating medium separating different layers in the circuit board may be carbonized to generate conductivity, so that the circuits with overlapping positive and negative electrodes are directly connected, that is, the positive and negative electrodes of the battery are short-circuited, which further causes battery failure, and even fire, explosion and other safety issues. Utility Model Content

[0004] The present application provides a power converter and an energy storage device, which can prevent the positive and negative circuits in the power conversion circuit from being stacked in a circuit board.

[0005] In a first aspect, the present application provides a power converter, and the power converter provided by the present application includes a power conversion circuit module, an input terminal, an output terminal and a printed circuit board PCB. The power conversion circuit module forms a power conversion circuit through a trace on the PCB, and the first end of the power conversion circuit is connected to a DC power supply through the input terminal, and the second end of the power conversion circuit is used for output, and the input terminal includes a first positive terminal and a first negative terminal. The power conversion circuit module includes a first positive circuit, a first negative circuit, a first input bridge arm, a second input bridge arm, a power inductor and an output bridge arm, and the first input bridge arm and the second input bridge arm are connected between the first positive terminal and the input end of the power inductor through the first positive circuit, and the first input bridge arm and the second input bridge arm are connected between the first negative terminal and the input end of the power inductor through the first negative circuit, and the output bridge arm is connected between the output end of the power inductor and the output terminal, wherein the first positive circuit includes a first trace, the first negative circuit includes a second trace, the first trace and the second trace are used to conduct the power conversion circuit, and the first trace and the second trace overlap on a projection plane perpendicular to the PCB. At least a portion of the first trace or the second trace does not contact the PCB.

[0006] The power converter provided in the embodiment of the present application makes part of one of the two overlapping traces in the input circuit perpendicular to the projection surface of the PCB not in contact with the PCB, that is, sets this part of the trace in the area outside the PCB, so that the positive and negative circuits do not form a stack in the PCB, thereby avoiding the possibility of direct conduction of the circuits with overlapping positive and negative electrodes when the insulating medium separating different layers in the circuit board is carbonized to produce conductivity. It should be understood that when the insulating medium separating different layers in the circuit board at the input end is carbonized and conductive, it is impossible to avoid short circuiting the positive and negative electrodes of the battery by shutting off the circuit, so the present application can improve the safety of the PCB.

[0007] In combination with the first aspect, in some implementations of the first aspect, a first bridge is provided on the PCB, and the first bridge is used to conduct the power conversion circuit. At least part of the first routing line does not contact the PCB, and at least part of the first routing line that does not contact the PCB crosses the second routing line through the first bridge, wherein two contacts connecting the first bridge and the PCB are respectively arranged on both sides of the second routing line, or at least part of the second routing line does not contact the PCB, and at least part of the second routing line that does not contact the PCB crosses the first routing line through the first bridge, wherein the two contacts connecting the first bridge and the PCB are respectively arranged on both sides of the first routing line.

[0008] The power converter provided in the embodiment of the present application can enable at least part of the routing that does not contact the PCB to cross the routing of the other pole in an area outside the PCB through a bridge structure, so that the positive and negative circuits do not form a stack in the PCB, thereby improving the safety of the PCB.

[0009] Optionally, the first bridge may be a metal conductor, or a composite circuit unit composed of a metal conductor and other PCBs, which is not limited in the present application. The outer layer of the metal conductor may be coated with an insulating material. It should be understood that the bridge composed of metal conductors has a stronger conductivity than the wiring in the PCB, and thus can further reduce the line loss of the circuit where the bridge is located.

[0010] In combination with the first aspect, in certain implementations of the first aspect, the PCB includes a first area and a second area which are arranged adjacent to each other in sequence, the input terminal is arranged in the first area, the first input bridge arm and the second input bridge arm are arranged in the second area, the first area and the second area are arranged in sequence along a first direction, the first input bridge arm and the second input bridge arm are arranged in sequence along a second direction, and an angle is formed between the second direction and the first direction.

[0011] The power converter provided in the embodiment of the present application can shorten the distance between the two input bridge arms and the input terminals by arranging the first area including the input terminals and the second area including the two input bridge arms in sequence along a first direction, and arranging the two input bridge arms in sequence along another direction, thereby shortening the electrical connection path between the two input bridge arms and the input terminals, which has the advantage of reducing power consumption.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the two contacts connecting the first bridge and the PCB are respectively a first contact and a second contact, the first contact is arranged between the first input bridge arm and the second input bridge arm in the second zone, and the second contact is arranged in the first zone.

[0013] In the power converter provided in the embodiment of the present application, the first input bridge arm and the second input bridge arm in the second zone are high-power consumption circuits, that is, circuits that mainly generate heat. The first zone of the input terminal has lower power consumption. By respectively arranging the two contacts of the bridge in the high-power consumption area and the low-power consumption area, the excellent thermal conductivity of the bridge can be used to direct the heat generated by the input bridge arm and the power inductor to the low-power consumption area, thereby improving the heat dissipation effect of the high-power consumption area and balancing the temperature of the power conversion circuit.

[0014] In combination with the first aspect, in some implementations of the first aspect, at least a portion of the power inductor is disposed between the first input bridge arm and the second input bridge arm in the second region.

[0015] The power converter provided by the embodiment of the present application can save PCB space by setting at least part of the power inductor between the two input bridge arms, which is conducive to the design of the miniaturization of the size of the overall PCB architecture, and the power consumption of the power inductor is less than the power consumption of the first input bridge arm and the second input bridge arm. The part of the power inductor set between the two input bridge arms will not affect the heat dissipation of the two input bridge arms, and the heat of the two input bridge arms will not affect the working performance of the power inductor. Since the two input bridge arms need to be electrically connected to the input end of the power inductor, the smaller the electrical connection path between the two circuits, the smaller the power consumption. This solution can reduce the electrical connection path between the two input bridge arms and the input end of the power inductor by setting part of the power inductor between the two input bridge arms, which has the advantage of reducing power consumption.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the PCB includes a first side and a third side that are relatively arranged, the extension direction of the first side and the third side are both in the first direction, the first input bridge arm is adjacent to the first side, and the second input bridge arm is adjacent to the third side.

[0017] The power converter provided in the embodiment of the present application makes the two input bridge arms located at different edge positions of the PCB so that the interval between the two input bridge arms is as large as possible, thereby improving the heat dissipation efficiency of the two input bridge arms.

[0018] In combination with the first aspect, in some implementations of the first aspect, the first contact is electrically connected to the first input bridge arm and the second input bridge arm.

[0019] The power converter provided in the embodiment of the present application can reduce the complexity of routing in the PCB and further reduce the line loss of the circuit where the bridge is located by electrically connecting the two input bridge arms to the bridge at the same time and conducting current convergence through the bridge.

[0020] In combination with the first aspect, in certain implementations of the first aspect, the power conversion circuit module includes a second positive circuit and a second negative circuit, the output bridge arm includes a first output bridge arm and a second output bridge arm, the output terminal includes a second positive terminal and a second negative terminal, the first output bridge arm and the second output bridge arm are connected between the two positive terminals and the output end of the power inductor through the second positive circuit, and the first output bridge arm and the second output bridge arm are connected between the second negative terminal and the output end of the power inductor through the second negative circuit, wherein the second positive circuit includes a third trace, the second negative circuit includes a fourth trace, the third trace and the fourth trace are used to conduct the power conversion circuit, the third trace and the fourth trace overlap on a projection plane perpendicular to the PCB, and at least part of the third trace or the fourth trace does not contact the PCB.

[0021] The power converter provided in the embodiment of the present application makes a portion of one of the two overlapping traces in the output circuit on the projection plane perpendicular to the PCB not contact the PCB, that is, this portion of the trace is arranged in an area outside the PCB, so that the positive and negative circuits do not form a stack in the PCB, thereby reducing the possibility of direct conduction of the circuit with overlapping positive and negative electrodes when the insulating medium separating different layers in the circuit board is carbonized to generate conductivity, thereby improving the safety of the output circuit in the PCB.

[0022] In combination with the first aspect, in certain implementations of the first aspect, a second bridge is provided on the PCB, the second bridge is used to conduct the power conversion circuit, at least part of the third routing is not in contact with the PCB, at least part of the third routing that is not in contact with the PCB crosses the fourth routing through the second bridge, wherein two contacts connecting the second bridge and the PCB are respectively arranged on both sides of the fourth routing, or at least part of the fourth routing is not in contact with the PCB, at least part of the fourth routing that is not in contact with the PCB crosses the third routing through the second bridge, wherein the two contacts connecting the second bridge and the PCB are respectively arranged on both sides of the fourth routing.

[0023] The power converter provided in the embodiment of the present application can enable at least part of the wiring in the output circuit that does not contact the PCB to cross the wiring of the other pole in an area outside the PCB through a bridge structure, so that the positive and negative circuits do not form a stack in the PCB, thereby improving the safety of the output circuit of the PCB.

[0024] In combination with the first aspect, in certain implementations of the first aspect, the PCB includes a third area and a fourth area that are arranged adjacent to each other in sequence, the first output bridge arm and the second output bridge arm are arranged in the third area, the output terminal is arranged in the fourth area, the third area and the fourth area are arranged in sequence along the first direction, the first output bridge arm and the second output bridge arm are arranged in sequence along the second direction, and an angle is formed between the second direction and the first direction.

[0025] The power converter provided in the embodiment of the present application can shorten the distance between the two output bridge arms and the output terminals by arranging the fourth area including the output terminals and the third area including the two output bridge arms in sequence along a first direction, and arranging the two output bridge arms in sequence along another direction, thereby shortening the electrical connection path between the two output bridge arms and the output terminals, which has the advantage of reducing power consumption.

[0026] In combination with the first aspect, in certain implementations of the first aspect, the two contacts connecting the second bridge frame and the PCB are respectively a third contact and a fourth contact, the third contact is arranged between the first output bridge arm and the second output bridge arm in the third zone, and the fourth contact is arranged in the fourth zone.

[0027] The power converter provided in the embodiment of the present application can utilize the excellent thermal conductivity of the bridge frame to direct the heat generated by the output bridge arms and the power inductor to the low-power consumption area by respectively arranging the two contacts of the bridge frame in the output circuit in a high-power consumption area including the two output bridge arms and a low-power consumption area including the output terminals, thereby further improving the heat dissipation effect of the high-power consumption area and balancing the temperature of the power conversion circuit.

[0028] Optionally, the second bridge is made of a metal conductor.

[0029] In combination with the first aspect, in some implementations of the first aspect, at least a portion of the power inductor is disposed between the first output bridge arm and the second output bridge arm in the third region.

[0030] The power converter provided in the embodiment of the present application can further save PCB space by setting at least part of the power inductor between the two output bridge arms, which is beneficial to the design of miniaturization of the overall PCB architecture. In addition, since the two output bridge arms need to be electrically connected to the output end of the power inductor, the smaller the electrical connection path between the two circuits, the smaller the power consumption. By setting part of the power inductor between the two output bridge arms, the present solution can shorten the electrical connection path between the two output bridge arms and the output end of the power inductor, which has the advantage of reducing power consumption.

[0031] In combination with the first aspect, in certain implementations of the first aspect, the PCB includes a first side and a third side that are relatively arranged, the extension direction of the first side and the third side are both in the first direction, the first output bridge arm is adjacent to the first side, and the second output bridge arm is adjacent to the third side.

[0032] The power converter provided in the embodiment of the present application makes the two output bridge arms located at different edge positions of the PCB so that the interval between the two output bridge arms is as large as possible, thereby improving the heat dissipation efficiency of the two output bridge arms.

[0033] In combination with the first aspect, in certain implementations of the first aspect, the third contact is electrically connected to the first output bridge arm and the second output bridge arm.

[0034] The power converter provided in the embodiment of the present application can reduce the complexity of routing in the PCB and further reduce the line loss of the circuit where the bridge is located by electrically connecting the two output bridge arms to the bridge at the same time and conducting current convergence through the bridge.

[0035] In combination with the first aspect, in certain implementations of the first aspect, the first input bridge arm, the power inductor and the first output bridge arm constitute a first-phase H-bridge power conversion circuit, the second input bridge arm, the power inductor and the second output bridge arm constitute a second-phase H-bridge power conversion circuit, and the first-phase H-bridge power conversion circuit and the second-phase H-bridge power conversion circuit are connected in parallel.

[0036] The power converter provided in the embodiment of the present application limits a specific circuit architecture. The H-bridge power conversion circuit is symmetrical, energy is easy to flow in both directions, and is easy to control. In addition, the two-phase interleaved circuit layout is simple, which can ensure the stability and reliability of the circuit.

[0037] In a second aspect, the present application provides an energy storage device, which includes an energy storage unit and a power converter in the above-mentioned first aspect or any possible implementation of the first aspect, one end of the power converter is used to connect to a power grid and / or a load, and the other end of the power converter is used to connect to the energy storage unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1A schematic structural diagram of an energy storage system 100 provided in this application.

[0039] Figure 2 It is a schematic diagram of a power converter provided by the present application.

[0040] Figure 3 It is a schematic diagram of an energy storage device provided in this application.

[0041] Figure 4 It is a schematic diagram of a wiring method of a traditional circuit board 400.

[0042] Figure 5 4 is a schematic cross-sectional view of a circuit board 400 with stacking phenomenon.

[0043] Figure 6 It is a schematic diagram of the architecture of a circuit board 600 provided in the present application.

[0044] Figure 7 It is a cross-sectional schematic diagram of the circuit board 600 provided in the present application.

[0045] Figure 8 It is a schematic diagram of another structural method of a circuit board 600 provided in the present application.

[0046] Fig. 9 It is a cross-sectional schematic diagram of another circuit board 600 provided in the present application.

[0047] Fig.10 It is a schematic diagram of another structural method of a circuit board 600 provided in the present application.

[0048] Fig.11 It is a schematic diagram of another structural method of a circuit board 600 provided in the present application.

[0049] Fig.12 It is a cross-sectional schematic diagram of the power converter 200 provided in the present application.

[0050] Fig.13 It is an equivalent circuit diagram of the power conversion circuit provided in this application. DETAILED DESCRIPTION

[0051] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0052] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application.

[0053] The terms "first", "second", "third", "fourth", etc. (if any) in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The size of the sequence number of each process below does not mean the order of execution, and the execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. For example, in the embodiment of the present application, the words "110", "210", "220" and the like are only marks made for the convenience of description, and are not intended to limit the device.

[0054] References to "some embodiments" and the like described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in some embodiments" and the like that appear at different places in this specification do not necessarily all refer to the same embodiment, but rather mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "comprises", "has" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0055] The terms used in the disclosed embodiments are only for the purpose of describing specific embodiments and are not intended to limit the disclosed embodiments. The singular forms of "a", "the" used in the disclosed embodiments and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0056] It should be noted that in the embodiments of the present application, "connection" refers to electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. For example, the connection between A and B can also be a direct connection between A and C, and C and B can be directly connected, and A and B are connected through C.

[0057] First, the application scenarios of the present application are introduced. The power converter provided in the present application can be applied to various application fields such as the energy storage power field, photovoltaic power generation field, new energy intelligent microgrid field, power transmission and distribution field, etc. The structure of the power converter provided in the embodiment of the present application can be applied to equipment with power conversion function, such as photovoltaic optimizers, DC / DC converters and other power converter equipment. The power converter provided in the embodiment of the present application is suitable for different application scenarios, such as energy storage power supply scenarios, photovoltaic power supply scenarios, photovoltaic storage hybrid power supply scenarios, uninterruptible power supply (UPS) power supply scenarios, etc., which are not limited in the embodiments of the present application. The following is an explanation taking the energy storage power supply scenario as an example.

[0058] Figure 1 A schematic structural diagram of an energy storage system 100 provided in an embodiment of the present application.

[0059] like Figure 1 As shown, the energy storage system 100 includes N energy storage devices (e.g., energy storage devices 111 to 11n) and a controller 170. Each of the N energy storage devices includes at least one energy storage unit and a direct current (DC) / DC conversion circuit. One end of the DC / DC conversion circuit of each energy storage device is connected to a DC bus.

[0060] Specifically, taking the energy storage device 111 as an example, the energy storage device 111 includes a DC / DC conversion circuit 151 and an energy storage unit 161. The first end of the DC / DC conversion circuit 151 is correspondingly connected to the energy storage unit 161, and the second end of the DC / DC conversion circuit 151 is connected to the DC bus.

[0061] Each energy storage unit here may include at least one battery cluster, and each battery cluster is connected in parallel. A battery cluster may be composed of multiple battery groups connected in series. The battery group may be a battery pack, and a battery pack may be composed of one or more battery cells (the voltage of the battery cell is usually between 2.5V and 4.2V) connected in series and parallel to form the smallest energy storage and management unit. The battery pack can also be called a battery cell group. The battery cell is also called a single cell or a single cell, which is the basic element of the battery cell group. The capacity and voltage provided by the same battery cell are generally considered to be the same. The energy storage unit is connected in parallel to the DC bus (not shown in the figure) through a DC / DC conversion circuit.

[0062] Optionally, the energy storage system 100 may also include an alternating current (AC) / DC converter (not shown in the figure), a power grid 120, and a load 130, so as to convert the DC power from the DC bus into AC power and output it to the power grid 120 and / or the load 130, or convert the AC power of the power grid 120 into DC power and store it in multiple energy storage devices.

[0063] It should be understood that the DC / DC conversion circuit may be a bidirectional conversion circuit, which can realize charging or discharging of the energy storage unit.

[0064] Optionally, the energy storage system 100 may also include a photovoltaic assembly 140, which may also be referred to as a photovoltaic array, including a plurality of photovoltaic strings. Photovoltaic is also referred to as photovoltaic, or PV for short. A string is also referred to as a string. Each photovoltaic string includes a plurality of photovoltaic panels connected in series. Photovoltaic panels are used to convert light energy into electrical energy. The electrical energy generated by photovoltaic panels is direct current. The voltage across the photovoltaic string is equal to the sum of the voltages generated by the plurality of photovoltaic panels. The output power of the photovoltaic assembly 140 may represent the electrical energy output per unit time of the photovoltaic assembly.

[0065] It can be understood that when the energy storage system 100 includes the photovoltaic component 140 and the energy storage device, the DC / DC conversion circuit is mainly used to connect the photovoltaic component 140 and the energy storage unit so as to charge the energy storage unit.

[0066] It should be understood that the DC / DC conversion circuits in the energy storage devices 111 to 11n can be arranged in the same power converter, such as a DC / DC converter or a photovoltaic inverter, and the controller can also be arranged in the power converter. Alternatively, the DC / DC conversion circuits in the energy storage devices 111 to 11n are arranged in different power conversion devices, respectively, and this application does not limit this.

[0067] It should be noted that in the embodiment of the present application, the controller is used to implement control management inside the energy storage device, and ultimately realize the external power supply or internal charging function of the energy storage device, so that the output voltage of the energy storage device can adapt to electric power equipment with a variety of rated working voltage specifications.

[0068] Optionally, the controller described above may be a corresponding controller in the energy storage device, or may be a controller independent of the energy storage device, for example, an independent monitoring and coordination control center that is communicatively connected to a plurality of energy storage devices. As long as it can be ensured that control instructions can be transmitted between the controller and the power converter. It should be understood that the embodiments of the present application are not limited to this.

[0069] For example, the controller can be connected to the power station management system on the upper layer of the energy storage system, and adjust the operating state of the energy storage device upon receiving the control instructions sent by the power station management system. Specifically, the power station management system can obtain the operating parameters of the power grid regularly or in real time, and monitor the operating state of the power grid. At the same time, the power station management system can send dispatch instructions to the controller according to the operating conditions of the power grid. After receiving the above dispatch instructions, the controller can adjust the drive signal of the switch tube in the power conversion circuit of the energy storage device by sending control information, thereby adjusting the working state of the energy storage device. The energy storage device can also periodically send the working information of the energy storage device to the controller to facilitate monitoring and management.

[0070] Exemplarily, the controller may be any hardware chip with processing functions, such as a microcontroller unit (MCU), or at least one of the following: an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a single-chip microcomputer. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0071] It should also be noted that, when the energy storage device includes an energy storage unit, the controller may be located in the energy storage unit or in other modules in the energy storage device. For example, the controller may also be a control circuit disposed on a printed circuit board (PCB). It should be understood that the embodiments of the present application are not limited to this.

[0072] In recent years, with the rapid development of energy, photovoltaic and other industries, the power of high-power power converters has been continuously improved, which has put forward new requirements for the safety specifications of existing power converters. Taking the power converter in the 48V smart lithium battery system as an example, it includes an H-bridge power conversion circuit, which can realize the functions of boosting, bucking, charging and discharging of smart batteries. Among them, the positive and negative poles of the input end of the H-bridge power conversion circuit are used to connect to the positive and negative poles of the battery respectively.

[0073] However, in the circuit board architecture of the prior art, when the positive and negative electrodes of the input end of the power conversion circuit are respectively arranged in different layers on the circuit board, the positive and negative circuits may overlap on the projection surface perpendicular to the circuit board, which is a lamination phenomenon. Figure 4 As shown, in the circuit in which the input bridge arm 411 and the input bridge arm 412 are connected to the positive and negative poles of the input end, the positive circuit (shown by the solid arrow) and the negative circuit (shown by the dotted arrow) are stacked (shown by the black circle) on the projection surface of the vertical circuit board 400. Figure 5 4 is a cross-sectional view of a circuit board 400 with the above-mentioned lamination phenomenon. When a component on the circuit board fails and causes a small-scale fire, the insulating medium separating different layers in the circuit board may be carbonized to generate conductivity, so that the circuit with overlapping positive and negative electrodes is directly connected, that is, the positive and negative electrodes of the battery are short-circuited, thereby causing safety problems such as battery failure, fire, and explosion.

[0074] Based on this, the embodiments of the present application provide a power converter and an energy storage device, which can prevent the positive and negative circuits in the power conversion circuit from being stacked in the circuit board.

[0075] Figure 2 Schematic diagram of a power converter provided by one embodiment of the present application. Figure 2 The power converter 200 includes a housing 210 and a circuit board 600 with a power conversion function disposed inside the housing 210 .

[0076] In the embodiment of the present application, the housing 210 can protect the circuit board 400 and the power distribution device. The circuit board 600 is connected to the external circuit through a plurality of connection terminals (211, 212).

[0077] It should be understood that the power conversion circuit can be carried by a printed circuit board (PCB). In other words, the circuit board 600 can be a printed circuit board, which is a support for electronic components and also a carrier for electrical connection of electronic components. The printed circuit board has the function of supporting circuit components and interconnecting circuit components. The electronic components include but are not limited to capacitors, inductors, resistors, processors, memories, antennas, etc. In general, a printed circuit board with electronic components welded thereon can also be referred to as a printed circuit board assembly (PCBA).

[0078] The electronic components carried by the printed circuit board can form multiple functional modules to achieve corresponding functions. The shape of the printed circuit board can be designed according to the shape of the electronic device and the position and shape of the functional modules to be arranged inside the electronic device.

[0079] In some embodiments, electrical components such as power inductors, bus capacitors, and power modules are mounted on the circuit board 600. The electrical components such as power inductors, bus capacitors, and power modules can be connected to the circuit board 600 through pins.

[0080] The housing 210 is provided with an input socket 211 and an output socket 212, and the circuit board 600 with power conversion function is provided with an input terminal 221 and an output terminal 222, the input terminal 221 and the output terminal 222 can be specifically a connector structure, and the input terminal 221 and the output terminal 222 can respectively include a positive terminal and a negative terminal. For example, the positive terminal 2211 of the input terminal 221 can be used to connect the positive electrode of the energy storage unit, and the negative terminal 2212 of the input terminal 221 can be used to connect the negative electrode of the energy storage unit.

[0081] The input terminal 221 is disposed inside the housing 210 and opposite to the input socket 211. Of course, the input terminal 221 can also be disposed inside the input socket 211. One end of the power line extends from the input socket 211 into the housing 210 and is electrically connected to the input terminal 221, so that the input terminal 221 can be electrically connected to a power supply (such as a battery) outside the power converter 200.

[0082] Optionally, the connection method between the external circuit and the input socket or the output socket includes welding, clamping, plugging, screw fixing, etc. For example, by tightening one end of the external circuit with a screw on the input socket or the output socket, so that it clamps the metal pins on the external circuit, the electrical connection between the pins is achieved; or one end of the external circuit is a plug corresponding to the interface of the input socket or the output socket of the power converter, and the two can be mechanically connected. Exemplarily, the input socket or the output socket includes a socket-type wiring socket, a screw-type wiring socket, a spring-type wiring socket, etc.

[0083] The output terminal 222 is disposed inside the housing 210 and opposite to the output socket 212. Of course, the output terminal 222 may also be inside the output socket 212. One end of the power cord extends from the output socket 212 into the housing and is electrically connected to the output terminal 222, so that the output terminal 222 can be electrically connected to the power product (load) and / or the power grid.

[0084] Figure 3 is a schematic diagram of an energy storage device 300 provided in one embodiment of the present application. Figure 3 The energy storage device 300 includes a housing 210 and a circuit board 600 with a power conversion function and an energy storage unit 30 arranged inside the housing 210. The circuit board 600 with a power conversion function is provided with an input terminal 221 and an output terminal 222. The energy storage unit 30 is electrically connected to the input terminal 221, and the energy storage unit 30 serves as a power supply for the circuit board 600 with a power conversion function. An output socket 212 is provided on the housing 210, and the output terminal 222 is arranged inside the housing 210 and opposite to the output socket 212. Of course, the output terminal 222 can also be inside the output socket 212. One end of the power cord extends from the output socket 212 into the housing and is electrically connected to the output terminal 222, so that the output terminal 222 can be electrically connected to the electrical product (load) and / or the power grid.

[0085] Figure 6 It is a schematic diagram of the architecture of a circuit board 600 with power conversion function provided by the present application.

[0086] like Figure 6 As shown, the power conversion circuit module includes a positive circuit (illustrated by a solid line with an arrow), a negative circuit (illustrated by a dotted line with an arrow), an input bridge arm 621, an input bridge arm 622, a power inductor 630 and an output bridge arm 640, wherein the input bridge arm 621 and the input bridge arm 622 are connected between the positive terminal 2211 and the input end of the power inductor 630 through the positive circuit, the input bridge arm 621 and the input bridge arm 622 are connected between the negative terminal 2212 and the input end of the power inductor 630 through the negative circuit, and the output bridge arm is connected between the output end of the power inductor 630 and the output terminal 222, wherein the routing 601 in the positive circuit and the routing 602 in the negative circuit are used to conduct the power conversion circuit, and the routing 601 and the routing 602 overlap on the projection plane perpendicular to the PCB. At least part of the routing 601 does not contact the PCB.

[0087] It should be understood that the positive circuit and the negative circuit may overlap on multiple projection surfaces perpendicular to the circuit board 600 , and only one of them is illustrated in the embodiment of the present application.

[0088] Specifically, Figure 6 As shown, the positive circuit may include a line connecting the positive terminal 2211 and the input bridge arm 621, and a line 602 connecting the positive terminal 2211 and the input bridge arm 622; the negative circuit may include a line 602 connecting the negative terminal 2212 and the input bridge arm 621, and a line connecting the negative terminal 2212 and the input bridge arm 622.

[0089] It should be understood that the positive circuit in the embodiment of the present application refers to a circuit network with positive electrical properties between the positive terminal 2211 and the input bridge arm, and the negative circuit refers to a circuit network with negative electrical properties between the negative terminal 2212 and the input bridge arm, that is, the electrical properties of the positive circuit are consistent with the positive pole of the energy storage unit, and the electrical properties of the negative circuit are consistent with the negative pole of the energy storage unit. Among them, the positive circuit or the negative circuit may also include Figure 6 For other routings other than those shown in Figure 7 For further explanation.

[0090] It should be understood that different routing lines in the same circuit can be located in the same layer or different layers of the circuit board 600, and routing lines in different circuits can be located in different areas of the same layer, or in different layers of the circuit board. This application does not limit this.

[0091] Specifically, a bridge 611 is provided on the circuit board 600, and the bridge 611 is used to conduct the power conversion circuit. At least part of the routing 601 that does not contact the circuit board 600 crosses the routing 602 through the bridge 611, wherein the two contact points connecting the bridge 611 and the circuit board 600 are respectively provided on both sides of the routing 602, and connect the routing 601 between the positive terminal 2211 and the input bridge arm 622 in the positive circuit. Therefore, the bridge 611 can also be regarded as a part of the routing 601.

[0092] Figure 7 600 is a cross-sectional view of a circuit board 600 provided in an embodiment of the present application. It should be understood that Figure 7 The circuit board 600 provided in the embodiment can be used with Figure 6 The circuit board 600 provided in the embodiment corresponds to.

[0093] like Figure 7 As shown, the bridge 611, that is, Figure 7 The portion filled with diagonal hatching can be used as a separate structure and connected to the circuit board 600 by plugging or welding.

[0094] In the embodiment of the present application, the trace 601 is located on the first layer of the circuit board 600, and the trace 602 is located on the second layer of the circuit board 600. The first layer and the second layer are separated by the insulating medium of the circuit board 600, that is, the base material, wherein the base material of the circuit board 600 is not conductive.

[0095] It should be understood that the circuit board 600 can be made of multiple layers of insulating material plates by lamination or bonding, and the circuit routing can be formed by conductive materials (such as copper foil) in different layers. The first layer and the second layer in the embodiment of the present application can refer to any two layers in the circuit board 600, wherein the first layer and the second layer can be two adjacent layers in the multi-layer structure.

[0096] Exemplarily, the circuit board 600 includes a four-layer structure, wherein the trace 601 and the trace 602 can be located in the middle two layers of the four-layer structure. Optionally, the trace 601 is located in the second layer of the circuit board 600, and the trace 602 is located in the first layer of the circuit board 600, which is not limited in this application.

[0097] Optionally, the bridge 611 may be composed of a metal conductor, or a composite circuit unit composed of a metal conductor and other PCBs, which is not limited in the present application. The outer layer of the metal conductor may be coated with an insulating material. It should be understood that the bridge composed of metal conductors has a stronger conductivity than the wiring in the PCB, and thus can further reduce the line loss of the circuit where the bridge is located.

[0098] Specifically, the size of the bridge 611 can be set according to factors such as the size of the power converter, safety specifications, experimental data, etc. For example, the spacing between the two contacts where the bridge 611 is connected to the circuit board 600 can be 5 mm, or the horizontal distance between each of the two contacts where the bridge 611 is connected to the circuit board 600 and the trace 602 can be 2 mm, and the distance between the highest point of the bridge 611 and the PCB can be 10 mm. The shape of the bridge 611 can be set to an arch, a door, etc., which is not limited in this application.

[0099] In this way, although there is overlap between routing 601 and routing 602 on the projection plane perpendicular to the circuit board 600, by setting a bridge 611 on the circuit board 600, the overlapping part of routing 601 can be kept away from the circuit board 600. In other words, this part of the routing is set outside the circuit board 600 and can maintain a safe distance from the routing 602 of the circuit board 600, so that the positive and negative circuits do not form a stack in the circuit board 600, thereby avoiding the possibility of direct conduction of the overlapping positive and negative circuits when the insulating medium separating different layers in the circuit board is carbonized to produce conductivity. Therefore, the present application can improve the safety of the power converter.

[0100] In some embodiments, at least a portion of the trace 602 of the negative circuit does not contact the PCB.

[0101] Figure 8 600 is a schematic diagram of another circuit board 600 provided in the present application. Figure 8 and Figure 6 The difference between .

[0102] like Figure 8 As shown, the negative circuit includes a trace 602 , and at least a portion of the trace 602 that does not contact the circuit board 600 crosses the trace 601 through a bridge 611 , wherein two contacts connecting the bridge 611 and the circuit board 600 are respectively arranged on both sides of the trace 601 .

[0103] Fig. 9 600 is a cross-sectional view of a circuit board 600 provided in an embodiment of the present application. It should be understood that Fig. 9 The circuit board 600 provided in the embodiment can be used with Figure 8 The circuit board 600 provided in the embodiment corresponds to.

[0104] like Fig. 9 As shown, the positive circuit is located on the first layer of the circuit board 600, and the negative circuit is located on the second layer of the circuit board 600. The bridge 611 penetrates into the second layer of the circuit board 600, and the two contacts connecting the bridge 611 and the circuit board 600 are respectively arranged on both sides of the trace 601, connecting the trace 602 between the negative terminal 2212 and the input bridge arm 621 in the negative circuit.

[0105] Fig.10 600 is a schematic diagram of another circuit board 600 provided in the present application. Fig.10 and Figure 6 The difference between .

[0106] like Fig.10 As shown, the circuit board 600 includes a region 651, a region 652, a region 653 and a region 654 which are arranged adjacent to each other in sequence. Fig.10 As shown, two adjacent regions do not overlap each other. Region 651, region 652, region 653 and region 654 are four different regions on a circuit board, not four different circuit structures.

[0107] It should be understood that Figure 6The embodiment introduces the connection mode of the positive circuit and the negative circuit of the input end. In the embodiment of the present application, the output bridge arm 640 includes an output bridge arm 641 and an output bridge arm 642, the output terminal 222 includes a positive terminal 2221 and a negative terminal 2222, the output bridge arm 641 and the output bridge arm 642 are connected between the positive terminal 2221 and the output end of the power inductor 630 through the positive circuit of the output end, and the output bridge arm 641 and the output bridge arm 642 are connected between the negative terminal 2222 and the output end of the power inductor 630 through the second negative circuit of the output end.

[0108] Among them, the input terminal 221 is arranged in the area 651, the input bridge arm 621 and the input bridge arm 622 are arranged in the area 652, the output bridge arm 641 and the output bridge arm 642 are arranged in the area 652, the output terminal 222 is arranged in the area 654, and the power inductor 630 is arranged between the area 651 and the area 654. It should be understood that the area where the input bridge arm and the output bridge arm are located has the largest heat generation in the circuit board 600, that is, on the circuit board 600, the area 652 and the area 653 are high power consumption areas where the heat generation is concentrated, and the temperature of the area 652 and the area 653 is relatively high; the area 651 and the area 654 are low power consumption areas, and the temperature of the area 651 and the area 654 is relatively low. In the embodiment of the present application, the input terminal 221 can be electrically connected to the energy storage unit in the energy storage device. The output terminal 222 is located in the area 654, and the output terminal 222 is used to electrically connect the load.

[0109] In the embodiment of the present application, the regions 651 and 652 are sequentially arranged along the first direction X, and the input bridge arm 621 and the input bridge arm 622 are sequentially arranged along the second direction Y. An angle is formed between the second direction Y and the first direction X. For example, the first direction X and the second direction Y can be perpendicular to each other, and the angle is 90°. In this way, the distance between the two input bridge arms and the input terminal 221 is shorter, so that the electrical connection path between the two input bridge arms and the input terminal can be shortened, which has the advantage of reducing power consumption.

[0110] In the embodiment of the present application, the two contacts connecting the bridge 611 and the circuit board 600 are a first contact and a second contact, wherein the first contact is arranged between the input bridge arm 621 and the input bridge arm 622 in the area 652 , and the second contact is arranged in the area 651 .

[0111] Specifically, Fig.10 As shown, there is a space between the input bridge arm 621 and the input bridge arm 622, one end of the bridge frame 611, that is, the first contact point where the bridge frame 611 is connected to the circuit board 600 is arranged in the space between the input bridge arm 621 and the input bridge arm 622, and the other end of the bridge frame 611 is arranged in the area 651 where the input terminal 221 is located. The bridge frame 611 can be made of a metal conductor.

[0112] It should be understood that Fig.10 In the embodiment shown, the process of current flowing from the input terminal 221 to the output terminal 222 is a discharge process. During the discharge process, the input bridge arm 621 and the input bridge arm 622 are high-power circuits, that is, circuits that mainly generate heat, so the regions 651 on both sides of the region 652 generate less heat. In this way, by arranging the two contacts of the bridge frame 611 in the high-power region 652 and the low-power region 651, respectively, the excellent thermal conductivity of the bridge frame 611 can be used to guide the heat of the region 652 to the low-power region 651, thereby improving the heat dissipation effect on the high-power region. In addition, since there is a space gap between the input bridge arm 621 and the input bridge arm 622, the input bridge arm 621 and the input bridge arm 622 can be further dispersed, thereby balancing the temperature of the circuit board 600.

[0113] Optionally, the first contact point of the bridge frame 611 may also be arranged at other positions in the area 652 , such as at both sides of the input bridge arm 621 and the input bridge arm 622 , which is not limited in the present application.

[0114] In some embodiments, Fig.10 As shown, at least part of the power inductor 630 is arranged between the input bridge arm 621 and the input bridge arm 622 in the area 652. In this way, the space between the input bridge arm 621 and the input bridge arm 622 on the circuit board 600 can be fully utilized, which is conducive to the design of the miniaturization of the size of the circuit board 600 architecture, and the power consumption of the power inductor 630 is less than the power consumption of the input bridge arm 621 and the input bridge arm 622. The arrangement of part of the power inductor between the two input bridge arms will not affect the heat dissipation of the two input bridge arms, and the heat dissipation of the two input bridge arms will not affect the working performance of the power inductor. In addition, since the two input bridge arms need to be electrically connected to the input end of the power inductor, the smaller the electrical connection path, the smaller the power consumption. Therefore, this solution can reduce the electrical connection path between the two input bridge arms and the input end of the power inductor by arranging part of the power inductor between the two input bridge arms, which has the advantage of reducing power consumption.

[0115] Optionally, the power inductor 630 may not be arranged in the space between the input bridge arm 621 and the input bridge arm 622 , that is, the power inductor 630 is located outside the area 652 , and the space between the input bridge arm 621 and the input bridge arm 622 may be used to arrange circuit routing.

[0116] In a specific embodiment, the circuit board 600 includes a first side E1 and a third side E3 that are relatively arranged, and the extension direction of the first side E1 and the third side E3 are both the first direction X, and the input bridge arm 621 is adjacent to the first side E1, and the input bridge arm 622 is adjacent to the third side E3. In other words, the input bridge arm 621 and the input bridge arm 622 are arranged adjacent to the first side and the third side, respectively. Such an arrangement scheme enables the input bridge arm 621 and the input bridge arm 622 to be located at the edge of the circuit board 600, so that the interval area between the input bridge arm 621 and the input bridge arm 622 is as large as possible, which can improve the heat dissipation efficiency of the input bridge arm 621 and the input bridge arm 622. Optionally, the input bridge arm 621 and the input bridge arm 622 can also be located in the middle area of ​​the circuit board 600 (meaning not close to the edge).

[0117] Optionally, the input terminal 221 may be disposed adjacent to the first side E1 or the third side E3 .

[0118] In the embodiment of the present application, the first contact point of the bridge frame 611 is electrically connected to the input bridge arm 621 and the input bridge arm 622 .

[0119] like Fig.10 As shown, one end of the bridge 611 is connected to the positive input terminal 2211, and the other end is respectively connected to the input bridge arm 621 and the input bridge arm 622. In this way, by electrically connecting the two input bridge arms to the bridge at the same time, that is, by converging the wiring in the positive circuit through the bridge, the complexity of the wiring in the circuit board 600 can be reduced, and due to the excellent conductive performance of the bridge 611, the line loss of the positive circuit where the bridge 611 is located can be further reduced.

[0120] exist Fig.10 In the illustrated embodiment, the layout of the positive and negative circuits at the output end between the output end of the power inductor 630 and the output terminal 222 can be arranged according to the layout of the positive and negative circuits at the input end described above, so as to improve the safety of the output circuit in the circuit board 600.

[0121] Specifically, Fig.10 As shown, the positive circuit of the input end includes a trace 603, and the negative circuit includes a trace 604. A bridge 612 is also provided on the circuit board 600, and at least a portion of the trace 603 that does not contact the circuit board 600 crosses the trace 604 through the bridge 612, wherein the two contact points connecting the bridge 612 and the circuit board 600 are respectively provided on both sides of the trace 604.

[0122] In some embodiments, the regions 653 and 654 are sequentially arranged along a first direction X, the output bridge arms 641 and 642 are sequentially arranged along a second direction Y, and the second direction Y and the first direction X form an angle.

[0123] In some embodiments, the two contacts connecting the bridge 612 and the circuit board 600 are a third contact and a fourth contact, wherein the third contact is disposed between the output bridge arm 641 and the output bridge arm 642 in the region 653 , and the fourth contact is disposed in the region 654 .

[0124] Specifically, Fig.10 As shown, there is a space gap between the output bridge arm 641 and the output bridge arm 642, one end of the bridge frame 612, that is, the third contact point connecting the bridge frame 612 and the circuit board 600 is arranged in the space gap between the output bridge arm 641 and the output bridge arm 642, and the other end of the bridge frame 612 is arranged in the area 654 where the output terminal 222 is located.

[0125] In some embodiments, Fig.10 As shown, at least a portion of the power inductor 630 is disposed between the output bridge arm 641 and the output bridge arm 642 in the region 653 .

[0126] In some embodiments, the output bridge arm 641 is adjacent to the first side E1, and the output bridge arm 642 is adjacent to the third side E3. That is, the output bridge arm 641 and the output bridge arm 642 are disposed adjacent to the first side and the third side, respectively.

[0127] In some embodiments, the third contact of the bridge frame 612 is electrically connected to the output bridge arm 641 and the output bridge arm 642. Fig.10 As shown, one end of the bridge frame 612 is connected to the positive output terminal 2221 , and the other end is connected to the output bridge arm 641 and the output bridge arm 642 .

[0128] It should be understood that the layout of the output end and the beneficial effects that can be achieved in the embodiment of the present application are similar to the layout of the input end, and will not be repeated here.

[0129] In some embodiments, other circuit modules, such as a control circuit, etc., may be disposed on the left side of the area 651 and the right side of the area 654 on the circuit board 600, and this application does not limit this.

[0130] Fig.11 600 is a schematic diagram of another circuit board 600 provided in the present application. Fig.10 The difference is that Fig.10 The wiring in the negative circuit can cross the wiring in the positive circuit through the bridge 611 and the bridge 612.

[0131] Fig.12 2 is a cross-sectional schematic diagram of a power converter 200 provided in an embodiment of the present application.

[0132] like Fig.12As shown, the power converter 200 includes a housing 210 and a circuit board 600 with a power conversion function disposed inside the housing 210. The circuit board 600 may be the above-mentioned Figure 6-Figure 11 The circuit board 600 described in the embodiment.

[0133] Fig.12 In the illustrated embodiment, the circuit board 600 is provided with an area 652 having input bridge arms 621 and 622, and an area 652 having output bridge arms 641 and 642, and a heat-conducting medium is provided between the circuit board 600 and the housing 210, the heat-conducting medium connects the upper surface of the circuit board 600 and the inner surface of the housing 210, and the heat-conducting medium can dissipate heat for the power inductor 630, the input bridge arms 621 and 622, and the output bridge arms 641 and 642, which are provided between the area 651 and the area 654. Optionally, the heat-conducting medium can also cover more areas on the circuit board 600, thereby improving the heat dissipation effect.

[0134] Among them, the heat-conducting medium can be a metal plate structure, a structure with graphene material, a heat pipe, a heat spreader and other structures. The heat-conducting medium can be a solid structure, and the heat-conducting medium can also be in a grease or paste state. The outer surface of the housing 210 connected to one side of the heat-conducting medium is also provided with a plurality of heat-dissipating teeth, which are used to increase the contact area between the outer surface of the housing 210 and the air, thereby improving the heat dissipation effect. It should be understood that in the embodiment of the present application, the height of the bridge 611 can be less than the distance between the circuit board 600 and the housing 210, so as not to affect the normal installation of the circuit board 600 in the housing 210.

[0135] Fig.13 is an equivalent circuit diagram of the power conversion circuit provided by this application. Fig.13 As shown, the power converter provided by the present application can be a two-phase staggered parallel H-bridge power converter, which is connected between the energy storage unit and the load. The power converter includes a first-phase H-bridge converter and a second-phase H-bridge converter, wherein the first-phase H-bridge converter includes switch tubes Q1, Q2, Q5, Q6 and inductor L1, and the second-phase H-bridge converter includes switch tubes Q3, Q4, Q7, Q8 and inductor L2, and the two-phase H-bridge power converters are connected in parallel through in1, in2, out1 and out2.

[0136] In some embodiments, the switch tubes Q1-Q8 in the above-mentioned bridge arms can be giant transistors (GTR), metal-oxide-semiconductor field-effect transistors (MOSFET), insulated gate bipolar transistors (IGBT), gate turn-off thyristors (GTO) or other suitable devices, and the inductor L1 and the inductor L2 can be independent inductors or two-phase integrated inductors.

[0137] It should be understood that the embodiment of the present application does not limit the number of switch tubes in each bridge arm. Fig.13 Each switch tube shown in can be a plurality of switch tubes connected in parallel.

[0138] It should be noted that the present application does not limit the connection relationship between the various electronic components in the power conversion circuit. As long as the electronic component connection method can convert DC voltage, it is applicable to the power converter provided by the present application.

[0139] In some embodiments, the power conversion circuit may also be a three-phase architecture, and the specific configuration is similar to the above-mentioned two-phase architecture, which will not be described in detail here.

[0140] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0141] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0142] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0143] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power converter, characterized in that: The power converter comprises a power conversion circuit module, an input terminal, an output terminal and a printed circuit board PCB, wherein the power conversion circuit module forms a power conversion circuit through wiring on the PCB, a first end of the power conversion circuit is connected to a DC power supply through the input terminal, a second end of the power conversion circuit is used for output, and the input terminal comprises a first positive terminal and a first negative terminal; The power conversion circuit module includes a first positive circuit, a first negative circuit, a first input bridge arm, a second input bridge arm, a power inductor and an output bridge arm, the first input bridge arm and the second input bridge arm are connected between the first positive terminal and the input end of the power inductor through the first positive circuit, the first input bridge arm and the second input bridge arm are connected between the first negative terminal and the input end of the power inductor through the first negative circuit, and the output bridge arm is connected between the output end of the power inductor and the output terminal, wherein the first positive circuit includes a first routing line, the first negative circuit includes a second routing line, the first routing line and the second routing line are used to conduct the power conversion circuit, and the first routing line and the second routing line overlap on a projection plane perpendicular to the PCB; At least a portion of the first routing line or the second routing line does not contact the PCB.

2. The power converter according to claim 1, characterized in that: The PCB is provided with a first bridge frame, and the first bridge frame is used to conduct the power conversion circuit. At least part of the first routing line is not in contact with the PCB, and at least part of the first routing line that is not in contact with the PCB crosses the second routing line through the first bridge, wherein two contact points where the first bridge is connected to the PCB are respectively arranged on both sides of the second routing line; or At least part of the second routing does not contact the PCB, and at least part of the second routing that does not contact the PCB crosses the first routing through the first bridge, wherein two contacts connecting the first bridge and the PCB are respectively arranged on both sides of the first routing.

3. The power converter according to claim 2, characterized in that: The PCB includes a first area and a second area that are adjacent to each other in sequence, the input terminal is arranged in the first area, the first input bridge arm and the second input bridge arm are arranged in the second area, the first area and the second area are arranged in sequence along a first direction, the first input bridge arm and the second input bridge arm are arranged in sequence along a second direction, and an angle is formed between the second direction and the first direction.

4. The power converter according to claim 3, characterized in that: The two contacts connecting the first bridge and the PCB are respectively a first contact and a second contact. The first contact is arranged between the first input bridge arm and the second input bridge arm in the second area, and the second contact is arranged in the first area.

5. The power converter according to claim 4, characterized in that: At least a portion of the power inductor is disposed between the first input bridge arm and the second input bridge arm in the second region.

6. The power converter according to any one of claims 3 to 5, characterized in that: The PCB includes a first side and a third side that are arranged opposite to each other, the first side and the third side both extend in the first direction, the first input bridge arm is adjacent to the first side, and the second input bridge arm is adjacent to the third side.

7. The power converter according to claim 4 or 5, characterized in that: The first contact is electrically connected to the first input bridge arm and the second input bridge arm.

8. The power converter according to any one of claims 1 to 5, characterized in that: The power conversion circuit module includes a second positive circuit and a second negative circuit, the output bridge arm includes a first output bridge arm and a second output bridge arm, and the output terminal includes a second positive terminal and a second negative terminal. The first output bridge arm and the second output bridge arm are connected between the two positive terminals and the output end of the power inductor through the second positive circuit, and the first output bridge arm and the second output bridge arm are connected between the second negative terminal and the output end of the power inductor through the second negative circuit, wherein the second positive circuit includes a third routing line, the second negative circuit includes a fourth routing line, the third routing line and the fourth routing line are used to conduct the power conversion circuit, and the third routing line and the fourth routing line overlap on a projection plane perpendicular to the PCB; At least a portion of the third routing line or the fourth routing line does not contact the PCB.

9. The power converter according to claim 8, characterized in that: The PCB is provided with a second bridge frame, and the second bridge frame is used to conduct the power conversion circuit. At least part of the third routing line is not in contact with the PCB, and at least part of the third routing line that is not in contact with the PCB crosses the fourth routing line through the second bridge, wherein two contact points where the second bridge is connected to the PCB are respectively arranged on both sides of the fourth routing line; or At least part of the fourth routing line does not contact the PCB, and at least part of the fourth routing line that does not contact the PCB crosses the third routing line through the second bridge frame, wherein two contacts connecting the second bridge frame and the PCB are respectively arranged on both sides of the fourth routing line.

10. The power converter according to claim 9, characterized in that: The PCB includes a third area and a fourth area which are arranged adjacent to each other in sequence, the first output bridge arm and the second output bridge arm are arranged in the third area, the output terminal is arranged in the fourth area, the third area and the fourth area are arranged in sequence along a first direction, the first output bridge arm and the second output bridge arm are arranged in sequence along a second direction, and an angle is formed between the second direction and the first direction.

11. The power converter according to claim 10, characterized in that: The two contacts connecting the second bridge frame and the PCB are respectively a third contact and a fourth contact. The third contact is arranged between the first output bridge arm and the second output bridge arm in the third area, and the fourth contact is arranged in the fourth area.

12. The power converter according to claim 11, characterized in that: At least a portion of the power inductor is disposed between the first output bridge arm and the second output bridge arm in the third region.

13. The power converter according to claim 8, characterized in that: The PCB includes a first side and a third side that are arranged opposite to each other, the first side and the third side both extend in a first direction, the first output bridge arm is adjacent to the first side, and the second output bridge arm is adjacent to the third side.

14. The power converter according to claim 11 or 12, characterized in that: The third connection point is electrically connected to the first output bridge arm and the second output bridge arm.

15. The power converter according to claim 8, characterized in that: The first input bridge arm, the power inductor and the first output bridge arm constitute a first-phase H-bridge power conversion circuit, the second input bridge arm, the power inductor and the second output bridge arm constitute a second-phase H-bridge power conversion circuit, and the first-phase H-bridge power conversion circuit and the second-phase H-bridge power conversion circuit are connected in parallel.

16. An energy storage device, characterized in that: It comprises an energy storage unit and the power converter according to any one of claims 1 to 15, wherein one end of the power converter is used to connect to a power grid and / or a load, and the other end of the power converter is used to connect to the energy storage unit.

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