Energy storage assembly heating circuit and vehicle

Abstract

The embodiment of the utility model provides an energy storage assembly heating circuit and a vehicle, and relates to the field of energy storage assemblies. The energy storage assembly heating circuit comprises a first energy storage assembly, a second energy storage assembly, a driving module and a heating module, the positive electrode end of the second energy storage assembly is electrically connected with the positive electrode end of the first energy storage assembly through a first switch, and the negative electrode end of the second energy storage assembly is electrically connected with the negative electrode end of the first energy storage assembly; the first bridge arm confluence end of the electric drive module is electrically connected with the positive electrode end of the first energy storage assembly through the second switch. The heating module comprises a first bridge arm branch and a first capacitor which are arranged in parallel, the first end of the first bridge arm branch is electrically connected with the positive electrode end of a second energy storage assembly through a third switch, and the second end of the first bridge arm branch and the second bridge arm confluence end of the electric drive module are electrically connected with the negative electrode end of a first energy storage assembly through a fourth switch. And a first node between the two switching circuits of the first bridge arm branch is electrically connected with a motor winding confluence end of the electric drive module through a fifth switch.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage, in particular to an energy storage assembly heating circuit and a vehicle. BACKGROUND

[0002] With the development of new energy, more and more power equipment uses new energy as power. Batteries are widely used in new energy vehicles due to their high energy density, recyclable charging, safety and environmental protection, etc.

[0003] In a low temperature environment, the performance of the battery will decrease to a greater extent than at normal temperature, so the battery needs to be heated. However, in the related art, the heating efficiency of the battery is low.

[0004] The above statements are only used to provide background technical information related to the present application, and do not necessarily constitute the prior art. Invention content

[0005] One of the technical problems to be solved by the present disclosure is to provide an energy storage assembly heating circuit and a vehicle, which can improve the heating efficiency of the energy storage assembly.

[0006] In a first aspect, the present application provides an energy storage assembly heating circuit, comprising: a first energy storage assembly; a second energy storage assembly, a positive electrode end of the second energy storage assembly being electrically connected to a positive electrode end of the first energy storage assembly through a first switch, and a negative electrode end of the second energy storage assembly being electrically connected to a negative electrode end of the first energy storage assembly; an electric drive module, a first bridge arm bus end of the electric drive module being electrically connected to the positive electrode end of the first energy storage assembly through a second switch; a heating module comprising a first bridge arm branch and a first capacitor arranged in parallel, a first end of the first bridge arm branch being electrically connected to the positive electrode end of the second energy storage assembly through a third switch, a second end of the first bridge arm branch and a second bridge arm bus end of the electric drive module being electrically connected to the negative electrode end of the first energy storage assembly through a fourth switch, and a first node between the two switch circuits of the first bridge arm branch being electrically connected to a motor winding bus end of the electric drive module through a fifth switch.

[0007] In the technical scheme of the present application, the energy storage device is decoupled into a first energy storage assembly and a second energy storage assembly, and an alternating charging circuit and a discharging circuit are formed between the first energy storage assembly, the second energy storage assembly and the heating module, thereby generating an oscillating current flowing through the first energy storage assembly and the second energy storage assembly, improving the rate and efficiency of self-heating of the energy storage assembly.

[0008] In some embodiments, the heating module further comprises a voltage sampling circuit configured to collect voltage information of the first capacitor, the voltage information of the first capacitor being used to determine whether at least one of the third switch and the fifth switch is in a conducting state after the energy storage assembly heating circuit exits the heating mode. By detecting whether the third switch is stuck, in the case of sticking, the third switch is turned off in time, reducing the problem of pre-charging of the first capacitor caused by sticking of the third switch in the next self-heating process of the energy storage assembly heating circuit. If the fifth switch is stuck, the fifth switch is turned off in time, reducing the influence on the second energy storage assembly or the heating module when the second energy storage assembly and the heating module are in a connected state before the energy storage assembly heating circuit is self-heated.

[0009] In some embodiments, the heating module further comprises a temperature acquisition circuit configured to collect temperature information of the first bridge arm branch, the temperature information of the first bridge arm branch being used to determine whether the energy storage assembly heating circuit exits the heating mode. By detecting the temperature information of the first bridge arm branch, the risk of damage to the heating module can be reduced, and the safety of normal and stable operation of the entire circuit can be improved.

[0010] In some embodiments, the heating module further comprises a current sampling circuit configured to collect current information flowing through the fifth switch, the current information of the fifth switch being used as a current regulation amount. Through the current sampling circuit, the purpose of adjusting the size of the current flowing through the motor winding and entering the energy storage assembly can be achieved. In addition, by setting the current sampling circuit, overcurrent problems can be prevented, and overcurrent protection can be achieved.

[0011] In some embodiments, the fourth switch comprises a first sub-switch and a second sub-switch, wherein the second bridge arm bus end of the electric drive module is electrically connected to the negative terminal of the first energy storage assembly through the first sub-switch; and the second end of the first bridge arm branch is electrically connected to the negative terminal of the first energy storage assembly through the second sub-switch. This facilitates the control of the on-off of the electric drive module and the heating module, respectively.

[0012] In some embodiments, the fourth switch comprises a first sub-switch and a second sub-switch, wherein the second bridge arm bus end of the electric drive module is electrically connected to the negative terminal of the first energy storage assembly through the first sub-switch; and the second end of the first bridge arm branch is electrically connected to the negative terminal of the first energy storage assembly through the second sub-switch and the first sub-switch.

[0013] In some embodiments, the first current protector is arranged between the first bridge arm bus end of the electric drive module and the positive terminal of the first energy storage assembly. This can reduce damage to various devices in the electric drive module and the heating module in the energy storage assembly heating circuit caused by overcurrent.

[0014] In some embodiments, the second current protector is arranged between the second bridge arm bus end of the electric drive module and the negative terminal of the first energy storage assembly. The damage of the first energy storage assembly and the second energy storage assembly caused by overcurrent can be reduced.

[0015] In some embodiments, the second current protector is arranged between the first end of the first bridge arm branch and the positive terminal of the second energy storage assembly. The damage of each device in the heating module in the energy storage assembly heating circuit caused by overcurrent can be reduced.

[0016] In some embodiments, the electric drive module comprises a second capacitor, and the energy storage assembly heating circuit further comprises a sixth switch and a resistor arranged in series, wherein the sixth switch and the resistor arranged in series are arranged between the first bridge arm bus end of the electric drive module and the positive terminal of the first energy storage assembly, or arranged between the second bridge arm bus end of the electric drive module and the negative terminal of the first energy storage assembly. The damage of the second capacitor can be reduced.

[0017] In some embodiments, the first switch, the second switch, the third switch, the fourth switch and the fifth switch are located in the same housing. The number and length of the wire harnesses can be reduced, the parasitic parameters on the wire harnesses can be better optimized, and the circuit design is facilitated.

[0018] In some embodiments, the electric drive module comprises a motor and a plurality of second bridge arm branches arranged in parallel, each second bridge arm branch comprising a first switch circuit and a second switch circuit, the first bridge arm branch comprising a third switch circuit and a fourth switch circuit, the first end of the first switch circuit being electrically connected to the first bridge arm bus end, the second end of the second switch circuit being electrically connected to the second bridge arm bus end, the second end of the first switch circuit and the first end of the second switch circuit being electrically connected to the second node, the second node being electrically connected to a phase winding of the motor, the first end of the third switch circuit being the first end of the first bridge arm branch, the second end of the fourth switch circuit being the second end of the first bridge arm branch, the second end of the third switch circuit and the first end of the fourth switch circuit being electrically connected to the first node.

[0019] In some embodiments, in a first stage, the first energy storage assembly charges the first capacitor; in a second stage after the first stage, an oscillation current is generated between the first energy storage assembly and the second energy storage assembly. The heating of the double-branch parallel energy storage assembly can be achieved.

[0020] In some embodiments, the first stage includes a first sub-stage, a second sub-stage and a third sub-stage, in the first sub-stage, the second switch, the fourth switch, the first switch, the fifth switch are turned on, and the third switch is turned off; in the second sub-stage, the first switch circuit and the third switch circuit are turned on, and the second switch circuit and the fourth switch circuit are turned off; in the third sub-stage, the second switch, the third switch, the fourth switch and the fifth switch are turned on, and the first switch is turned off. The first energy storage assembly can charge the first capacitor, so that the voltage across the capacitor is consistent with the voltage across the first energy storage assembly.

[0021] In some embodiments, the second stage includes a fourth sub-stage, a fifth sub-stage, a sixth sub-stage and a seventh sub-stage, in the fourth sub-stage, the first switch circuit and the fourth switch circuit are turned on, and the second switch circuit and the third switch circuit are turned off; in the fifth sub-stage, the first switch circuit and the third switch circuit are turned on, and the second switch circuit and the fourth switch circuit are turned off; in the sixth sub-stage, the second switch circuit and the third switch circuit are turned on, and the first switch circuit and the fourth switch circuit are turned off; in the seventh sub-stage, the first switch circuit and the third switch circuit are turned on, and the second switch circuit and the fourth switch circuit are turned off. First, the inductor is charged by the first energy storage assembly, then the second energy storage assembly is charged by the first energy storage assembly and the inductor, then the inductor is charged by the second energy storage assembly, and finally the first energy storage assembly is charged by the second inductor and the inductor, realizing double-branch parallel energy storage assembly heating. In this embodiment, the first capacitor and the second capacitor are not used as energy storage elements, but are used to stabilize the voltage, so the thermal risk of the capacitor is reduced, and the energy storage assembly self-heating efficiency is improved. Moreover, during the energy storage assembly self-heating process, the electric drive does not generate torque, so the vehicle's NVH performance is also improved.

[0022] In some embodiments, in a third stage after the second stage, the first capacitor discharges. After the energy storage assembly completes the self-heating process, the capacitor is always in an electric state, which reduces the service life of the capacitor.

[0023] In some embodiments, in the case where the first bridge arm branch and the electric drive module share the same switch, in the third stage, the fifth switch is turned on, the first switch, the second switch, the third switch and the fourth switch are turned off, the first switch circuit and the fourth switch circuit are turned off, the second switch circuit is turned on, and the third switch circuit is turned on at a predetermined duty ratio. The first capacitor discharges through the motor winding, reducing the impact of the first capacitor on the service life due to the constant voltage.

[0024] In some embodiments, in the third stage, the fifth switch, the first sub-switch and the second sub-switch are turned on, the first switch, the second switch and the third switch are turned off, the first switch circuit and the fourth switch circuit are turned off, the second switch circuit is turned on, and the third switch circuit is turned on at a predetermined duty ratio, in the case that the second bus end of the second bridge arm of the electric drive module is electrically connected to the negative end of the first energy storage assembly through the first sub-switch, and the second end of the first bridge arm branch is electrically connected to the negative end of the first energy storage assembly through the second sub-switch and the first sub-switch. The first capacitor discharges through the motor winding, reducing the impact of the first capacitor on the service life due to the constant voltage.

[0025] In some embodiments, in the third stage, the fifth switch and the second sub-switch are turned on, the first switch, the second switch, the third switch and the first sub-switch are turned off, the first switch circuit and the fourth switch circuit are turned off, the second switch circuit is turned on, and the third switch circuit is turned on at a predetermined duty ratio, in the case that the second bus end of the second bridge arm of the electric drive module is electrically connected to the negative end of the first energy storage assembly through the first sub-switch, and the second end of the first bridge arm branch is electrically connected to the negative end of the first energy storage assembly through the second sub-switch and the first sub-switch. The first capacitor discharges through the motor winding, reducing the impact of the first capacitor on the service life due to the constant voltage, and improving the safety factor of the circuit.

[0026] In some embodiments, in the fourth stage after the third stage, the third switch and the fifth switch are turned off, and the second switch and the fourth switch are turned on, in the case that the first capacitor has the first voltage, the third switch is in the on state, and in the case that the first capacitor does not have the first voltage, the third switch is in the off state. This facilitates identification of whether the third switch has a sticking condition after the energy storage assembly heating circuit exits the self-heating mode.

[0027] In some embodiments, in the case that the third switch is in the off state, the third switch circuit is turned on, in the case that the first capacitor has the second voltage, the fifth switch is in the on state, and in the case that the first capacitor does not have the second voltage, the fifth switch is in the off state. This facilitates identification of whether the fifth switch has a sticking condition after the energy storage assembly heating circuit exits the self-heating mode.

[0028] In a second aspect, a vehicle is provided, comprising the energy storage assembly heating circuit described above.

[0029] Other features and advantages of the present disclosure will be apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the drawings.

[0031] Figure 1 Schematic diagram of a heating circuit of an energy storage assembly according to one or more embodiments;

[0032] Figure 2 Schematic diagram of a heating circuit of an energy storage assembly according to one or more embodiments;

[0033] Figure 3 Schematic diagram of a heating circuit of an energy storage assembly according to one or more embodiments;

[0034] Figure 4 Schematic diagram of a heating circuit of an energy storage assembly according to one or more embodiments;

[0035] Figure 5 Schematic diagram of a heating circuit of an energy storage assembly according to one or more embodiments;

[0036] Figure 6 Schematic diagram of a heating circuit of an energy storage assembly according to one or more embodiments;

[0037] Figure 7 Schematic diagram of a heating circuit of an energy storage assembly according to one or more embodiments;

[0038] Figure 8 Schematic diagram of a heating circuit of an energy storage assembly according to one or more embodiments;

[0039] Figure 9 Schematic diagram of a heating module according to one or more embodiments;

[0040] Figure 10 Schematic diagram of a current flow of a heating circuit of an energy storage assembly according to one or more embodiments;

[0041] Figure 11 Schematic diagram of a current flow of a heating circuit of an energy storage assembly according to one or more embodiments;

[0042] Figure 12 Schematic diagram of a current flow of a heating circuit of an energy storage assembly according to one or more embodiments;

[0043] Figure 13 Schematic diagram of a current flow of a heating circuit of an energy storage assembly according to one or more embodiments;

[0044] Figure 14A schematic diagram of current flow for a heating circuit of an energy storage assembly according to one or more embodiments;

[0045] Figure 15 A schematic diagram of current flow for a heating circuit of an energy storage assembly according to one or more embodiments;

[0046] Figure 16 A schematic diagram of current flow for a heating circuit of an energy storage assembly according to one or more embodiments. DETAILED DESCRIPTION

[0047] Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the examples and drawings is not to be taken as limiting the application, as the application is only limited by the claims. The detailed description includes specific details for the purpose of providing a thorough understanding of the application. However, it will be apparent to those skilled in the art that the application can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the application.

[0048] In the description of the present application, it should be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like, as well as terms of relative position such as "vertical", "horizontal", "on", "above", "below", "left of" and "right of", are intended to indicate directions or positions in the drawings and are not intended to indicate or imply specific orientations of the device or element thereof in use or in operation, unless otherwise specified. Further, the terms "first", "second", "third", and so on are used merely as identifiers, and are not intended to denote relative importance or significance. "Vertical" is not meant to be strictly vertical, but within an error tolerance. "Parallel" is not meant to be strictly parallel, but within an error tolerance.

[0049] It should also be understood that the sizes of the various parts shown in the drawings are not necessarily to scale, and that the drawings are intended as conceptual views, which are made primarily for purposes of explanation and are not intended to present an accurate, perspective view of the apparatus.

[0050] The following description of at least one example embodiment is merely exemplary in nature and is in no way intended to limit the scope of the disclosure, its application, or uses.

[0051] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and devices can be viewed as part of the specification.

[0052] In all of the examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not as a limitation. Thus, other examples of the example embodiments can have different values.

[0053] It should be noted that like reference numerals and letters in the various figures indicate like elements, and thus, one need not consult further discussion of the same as to their meaning and function.

[0054] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the drawings.

[0055] In the related art, the bridge arm converter is controlled according to a heating control mode, so that the discharging process of the battery pack to the bus capacitor and the charging process of the bus capacitor to the battery pack are alternately performed, to realize the heating of the battery pack. Since the bus capacitor is used for energy storage, the bus capacitor has large energy loss and large thermal risk, and cannot generate large current to improve the heating efficiency, resulting in low self-heating efficiency of the battery pack.

[0056] In the embodiments of the present application, the bus capacitor is not used as an energy storage element, but is decoupled into two energy storage components, to realize the mutual charging and discharging between the two energy storage components, so that the oscillation current is generated in the two energy storage components, to achieve the purpose of efficient heating and temperature rise of the energy storage component. The energy storage component of the present application can be a battery or other device capable of storing energy.

[0057] Figure 1 A schematic diagram of the energy storage component heating circuit according to one or more embodiments, the energy storage component heating circuit comprising a first energy storage component BT1, a second energy storage component BT2, an electric drive module 1 and a heating module 2.

[0058] In the embodiments, the energy storage device is decoupled into two energy storage components, i.e. the first energy storage component BT1 and the second energy storage component BT2, to realize the mutual charging and discharging between the two energy storage components, so that the oscillation current is generated in the two energy storage components, to achieve the purpose of efficient heating and temperature rise of the energy storage component.

[0059] The positive terminal of the second energy storage component BT2 is electrically connected to the positive terminal of the first energy storage component BT1 through the first switch S1, and the negative terminal of the second energy storage component BT2 is electrically connected to the negative terminal of the first energy storage component BT1. In the closed state of the first switch S1, the first energy storage component BT1 and the second energy storage component BT2 are in parallel mode. In some embodiments, the first energy storage component BT1 and the second energy storage component BT2 can each include one or more energy storage component units. In the case where the first energy storage component BT1 or the second energy storage component BT2 includes a plurality of energy storage component units, the plurality of energy storage component units can be connected in series or in parallel.

[0060] The first energy storage component BT1 and the second energy storage component BT2 can be a lithium-ion energy storage component, a lithium metal energy storage component, a lead-acid energy storage component, a nickel barrier energy storage component, a nickel-metal hydride energy storage component, a lithium-sulfur energy storage component, a lithium-air energy storage component or a sodium-ion energy storage component, etc., which are not limited here. The energy storage component in this embodiment can be used in power devices such as automobiles and ships. Due to the internal resistance in the first energy storage component BT1 and the second energy storage component BT2, when the discharge circuit and the charging circuit are working, the first energy storage component BT1 and the second energy storage component BT2 have current flowing into and out of them respectively, which will cause the internal resistance of the energy storage component to generate heat, thereby increasing the temperature of the energy storage component.

[0061] The first bridge arm bus terminal of the electric drive module 1 is electrically connected to the positive terminal of the first energy storage component BT1 through the second switch S2. The heating module 2 includes a first bridge arm branch 21 and a first capacitor C1 arranged in parallel. The first end of the first bridge arm branch 21 is electrically connected to the positive terminal of the second energy storage component BT2 through the third switch S3. The second end of the first bridge arm branch 21 and the second bridge arm bus terminal of the electric drive module 1 are electrically connected to the negative terminal of the first energy storage component BT1 through the fourth switch S4. The first node between the two switch circuits of the first bridge arm branch 21 is electrically connected to the motor winding bus terminal of the electric drive module 1 through the fifth switch S5.

[0062] The second switch S2, for example, is a main positive relay +, and the fourth switch S4 is a main negative relay -. Relays can perform functions in circuits such as automatic regulation, safety protection, and circuit switching. Other switching elements, such as the third switch S3, the fourth switch S4, and the fifth switch S5, are also relays.

[0063] The switch circuit of the first bridge arm branch is prone to generate ripples when being turned on and off, and the first capacitor C1 can play a role in voltage stabilization.

[0064] In this embodiment, by decoupling the energy storage device into a first energy storage component and a second energy storage component, an alternating charging circuit and a discharging circuit are formed between the first energy storage component, the second energy storage component and the heating module, thereby generating an oscillating current flowing through the first energy storage component and the second energy storage component, thereby improving the self-heating rate and efficiency of the energy storage component.

[0065] In some embodiments, as Figure 2 As shown, the electric drive module 1 includes a motor 11 and multiple second bridge arm branches arranged in parallel. Each second bridge arm branch includes a first switch circuit and a second switch circuit. The first end of the first switch circuit is electrically connected to the first bridge arm bus terminal, the second end of the second switch circuit is electrically connected to the second bridge arm bus terminal, the second end of the first switch circuit and the first end of the second switch circuit are electrically connected to a second node, and the second node is electrically connected to a phase winding of the motor.

[0066] When the electric drive module 1 includes three second bridge arm branches, the bridge arm converter formed by the three second bridge arm branches is a three-phase inverter, the three first switch circuits are respectively a first power switch unit, a second power switch unit and a third power switch unit. The three second switch circuits are respectively a fourth power switch unit, a fifth power switch unit and a sixth power switch unit. The first power switch unit and the fourth power switch unit form a first second bridge arm branch, the second power switch unit and the fifth power switch unit form a second second bridge arm branch, and the third power switch unit and the sixth power switch unit form a third second bridge arm branch. One end of the first power switch unit, the second power switch unit and the third power switch unit is commonly connected and constitutes a first bridge arm common terminal of the three-phase inverter, and one end of the fourth power switch unit, the fifth power switch unit and the sixth power switch unit is commonly connected and constitutes a second bridge arm common terminal of the three-phase inverter.

[0067] The motor 11 includes a three-phase winding, and a first end of each phase winding in the three-phase winding is connected to a midpoint of each bridge arm in the three second bridge arm branches in one-to-one correspondence. A second end of each phase winding in the three-phase winding is commonly connected to form a neutral point, i.e. a motor winding common terminal. For example, a first end of a first phase winding of the motor 11 is connected to a midpoint of the first second bridge arm branch, a first end of a second phase winding of the motor 11 is connected to a midpoint of the second second bridge arm branch, and a first end of a third phase winding of the motor 11 is connected to a midpoint of the third second bridge arm branch. The motor is a three-phase four-wire system, which can be a permanent magnet synchronous motor or an asynchronous motor. As shown in Figure 2 The motor 11 includes resistors R1 and inductors L1, resistors R2 and inductors L2, and resistors R3 and inductors L3.

[0068] As shown in Figure 2As shown, the first power switch unit in the bridge arm converter includes a first upper bridge arm V1 and a first upper bridge diode D1, the second power switch unit includes a second upper bridge arm V2 and a second upper bridge diode D2, the third power switch unit includes a third upper bridge arm V3 and a third upper bridge diode D3, the fourth power switch unit includes a fourth lower bridge arm V4 and a fourth lower bridge diode D4, the fifth power switch unit includes a fifth lower bridge arm V5 and a fifth upper bridge diode D5, and the sixth power switch unit includes a sixth lower bridge arm V6 and a sixth lower bridge diode D6. The anode of the first upper bridge diode D1 is electrically connected to a second node between the first upper bridge arm V1 and the fourth lower bridge arm V4, and the cathode of the first upper bridge diode D1 is electrically connected to the first bridge arm bus. The anode of the second upper bridge diode D2 is electrically connected to a second node between the second upper bridge arm V2 and the fifth lower bridge arm V5, and the cathode of the second upper bridge diode D2 is electrically connected to the first bridge arm bus. The anode of the third upper bridge diode D3 is electrically connected to a second node between the third upper bridge arm V3 and the sixth lower bridge arm V6, and the cathode of the third upper bridge diode D3 is electrically connected to the first bridge arm bus. The anode of the fourth lower bridge diode D4 is electrically connected to the second bridge arm bus, and the cathode of the fourth lower bridge diode D4 is electrically connected to the second node between the first upper bridge arm V1 and the fourth lower bridge arm V4. The anode of the fifth lower bridge diode D5 is electrically connected to the second bridge arm bus, and the cathode of the fifth lower bridge diode D5 is electrically connected to the second node between the second upper bridge arm V2 and the fifth lower bridge arm V5. The anode of the sixth lower bridge diode D6 is electrically connected to the second bridge arm bus, and the cathode of the sixth lower bridge diode D6 is electrically connected to the second node between the third upper bridge arm V3 and the sixth lower bridge arm V6.

[0069] The first upper bridge arm V1, the second upper bridge arm V2, the third upper bridge arm V3, the fourth lower bridge arm V4, the fifth lower bridge arm V5, and the sixth lower bridge arm V6 can be one or more of an Insulated Gate Bipolar Transistor (IGBT) chip, an IGBT module, a Metal-Oxide Semiconductor Field-Effect Transistor (MOSFET), and the like. In this regard, the combination and connection of the IGBT devices, MOSFET devices, and the like in the bridge arm are not limited. The material type of the power switch devices described above can be, for example, a power switch device made of silicon carbide or other materials. It is worth mentioning that the power switch devices described above can have a diode.

[0070] The first upper bridge diode D1, the second upper bridge diode D2, the third upper bridge diode D3, the fourth lower bridge diode D4, the fifth lower bridge diode D5 and the sixth lower bridge diode D6 can be a parasitic diode or a diode specially arranged. The diode is, for example, a diode made of silicon, silicon carbide or other materials.

[0071] In some embodiments, the first end of the third switch circuit is the first end of the first bridge arm branch, the second end of the fourth switch circuit is the second end of the first bridge arm branch, and the second end of the third switch circuit and the first end of the fourth switch circuit are electrically connected to the first node.

[0072] The third switch circuit is a seventh power switch unit, and the fourth switch circuit is an eighth power switch unit. As shown in Figure 2 The seventh power switch unit includes a seventh upper bridge arm V7 and a seventh upper bridge diode D7, and the eighth power switch unit includes an eighth lower bridge arm V2 and an eighth lower bridge diode D8.

[0073] In the above embodiment, by controlling the on-off of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the first switch circuit, the second switch circuit, the third switch circuit and the fourth switch circuit, the first energy storage assembly can be controlled to charge the first capacitor in the first stage, and the oscillation current between the first energy storage assembly and the second energy storage assembly can be generated in the second stage after the first stage. The first capacitor plays a role of voltage stabilization in this embodiment, and the oscillation current between the first energy storage assembly and the second energy storage assembly can be generated, so that the self-heating of the energy storage assembly can be realized.

[0074] Figure 3 A schematic diagram of the energy storage assembly heating circuit according to one or more embodiments, in which the fourth switch S4 includes a first sub-switch S41 and a second sub-switch S42, and the second bridge arm of the electric drive module 1 is electrically connected to the negative terminal of the first energy storage assembly BT1 through the first sub-switch S41; the second end of the first bridge arm branch is electrically connected to the negative terminal of the first energy storage assembly BT1 through the second sub-switch S42.

[0075] Compared with Figure 2 In this embodiment, one end of the electric drive module 1 and the heating module 2 does not share the same switch to be electrically connected to the first energy storage assembly BT1. Therefore, the first sub-switch S41 on the branch of the electric drive module 1 and the second sub-switch S42 on the branch of the heating module 2 can be controlled separately, so that the on-off of the electric drive module 1 and the heating module 2 can be controlled separately. Figure 2 In the embodiment shown, one end of the electric drive module 1 and the heating module 2 shares the same switch to be electrically connected to the first energy storage assembly BT1, which can save the cost of components and save the space of the energy storage assembly heating circuit.

[0076] In some embodiments, asFigure 4 As shown, the second bridge arm bus end of the electric drive module 1 is electrically connected to the negative end of the first energy storage assembly BT1 through the first sub-switch S41; the second end of the first bridge arm branch is electrically connected to the negative end of the first energy storage assembly BT1 through the second sub-switch S42 and the first sub-switch S41. The heating module 2 is connected to the negative end of the first energy storage assembly BT1 through two switches. Only when both switches are turned on, the heating module 2 is connected to the circuit.

[0077] In some embodiments, as shown in the figure, the energy storage assembly heating circuit further comprises a first current protector F1, which is arranged between the first bridge arm bus end of the electric drive module 1 and the positive end of the first energy storage assembly BT1. Figures 2 to 4

[0078] The first current protector F1 is, for example, a fuse. When the current flowing through the branch where the fuse is located exceeds a threshold value, the fuse automatically melts, thereby disconnecting the circuit, which can reduce damage to each device in the electric drive module 1 and the heating module 2 in the energy storage assembly heating circuit caused by overcurrent.

[0079] In some embodiments, as shown in the figure, the energy storage assembly heating circuit further comprises a second current protector F2, which is arranged between the second bridge arm bus end of the electric drive module 1 and the negative end of the first energy storage assembly BT1. Figure 2

[0080] The second current protector F2 is, for example, a fuse. When the current flowing through the branch where the fuse is located exceeds a threshold value, the fuse automatically melts, thereby disconnecting the circuit, which can reduce damage to the first energy storage assembly BT1 and the second energy storage assembly BT2 caused by overcurrent.

[0081] In some embodiments, as shown in the figure, the energy storage assembly heating circuit further comprises a second current protector F2, which is arranged between the first end of the first bridge arm branch and the positive end of the second energy storage assembly BT2. Figure 3

[0082] The second current protector F2 is, for example, a fuse. When the current flowing through the branch where the fuse is located exceeds a threshold value, the fuse automatically melts, thereby disconnecting the circuit, which can reduce damage to each device in the heating module 2 in the energy storage assembly heating circuit caused by overcurrent.

[0083] In some embodiments of the present disclosure, the electric drive module 1 comprises a second capacitor C2, which is a Dc-link capacitor. The support capacitor is in parallel connection with the second bridge arm branch of the first route. Similarly, the support capacitor is in parallel connection with the second bridge arm branch of the second route and the second bridge arm branch of the third route. One end of the support capacitor is electrically connected to the first bridge arm bus end, and the other end of the support capacitor is electrically connected to the second bridge arm bus end. ​​​

[0084] The second capacitor C2 can reduce the influence of voltage overshoot and transient overvoltage generated by each switching circuit in the bridge arm converter when the state is switched, stabilize the voltage on the DC bus, and keep the voltage fluctuation within the allowable range.

[0085] The energy storage assembly heating circuit further comprises a sixth switch K1 and a resistor R connected in series, as shown in Figure 2 and Figure 3 The sixth switch K1 and the resistor R connected in series are arranged between the first bridge arm bus end of the electric drive module 1 and the positive end of the first energy storage assembly BT1. Alternatively, as shown in Figure 4 The sixth switch K1 and the resistor R connected in series are arranged between the second bridge arm bus end of the electric drive module 1 and the negative end of the first energy storage assembly BT1.

[0086] The sixth switch K1 is a pre-charge relay. When the second switch S2 is closed, there is voltage in the first energy storage assembly BT1 and the second energy storage assembly BT2, but there is no voltage in the second capacitor C2. Before the first energy storage assembly BT1 and the second energy storage assembly BT2 deliver current to the electric drive module 1, the sixth switch K1 is closed first. Due to the presence of the resistor R, the current flowing into the second capacitor C2 can be slowed down, reducing the damage to the second capacitor C2.

[0087] Those skilled in the art should understand that the above-mentioned Figures 2 to 4 are only examples, and various circuit structures can be formed based on the above description.

[0088] In some embodiments of the present disclosure, as shown in Figures 5 to 7 The first switch S1, the second switch S2, the third switch S3, the fourth switch S4 and the fifth switch S5 are located in the same housing, for example, in a high-voltage distribution box. For example, all the switches are integrated in the same housing, which can reduce the number and length of the wiring harness, better optimize the parasitic parameters on the wiring harness, and facilitate circuit design. Other switching devices, such as the first current protector F1, the second current protector F2, the sixth switch K1, etc., can also be located in the high-voltage distribution box.

[0089] Those skilled in the art should understand that only part of the switches can be integrated in the same housing, and other switches and other devices can be integrated. For example, the first switch S1 is integrated in the energy storage assembly in which the first energy storage assembly BT1 and the second energy storage assembly BT2 are located. The third switch S3 and the fifth switch S5 are integrated in the heating module. When connecting the energy storage assembly heating circuit, since the connection switch is designed separately for a certain module, there is no need to design a switching element on the connection branch.

[0090] In some embodiments of the present disclosure, as shown in Figure 8As shown, the first energy storage assembly BT1 and the second energy storage assembly BT2 can be managed by a BMS (Battery Management System) 3. The battery management system 3 can manage and maintain each energy storage assembly unit, monitor the state of the energy storage assembly, prevent overcharging and over-discharging of the energy storage assembly, and prolong the service life of the energy storage assembly.

[0091] The drive module 1 is controlled by a motor controller 4. For example, the motor controller 4 can control the on-off of the switch circuit in each second bridge arm branch. For example, a corresponding PWM (Pulse Width Modulation) is sent to each switch circuit, so as to control the current flowing through the motor winding.

[0092] The heating module 2 is controlled by a heating module controller 5. For example, the heating module controller 5 controls the on-off of the switch circuit in the first bridge arm branch, and the size of the current flowing through the switch circuit.

[0093] Those skilled in the art should understand that the battery management system 3, the motor controller 4, the heating module controller 5, etc. can realize the related functions through one controller, or realize the related functions through multiple controllers.

[0094] In some embodiments, when the energy storage assembly heating circuit is applied to a vehicle, the vehicle further includes a VCU (Vehicle Control Unit) 6 for controlling the power system, the energy storage assembly system, the braking system and other key components of the vehicle, to ensure the safe and efficient operation of the vehicle. The battery management system 3, the motor controller 4, the heating module controller 5 and the vehicle control unit 6 can keep real-time communication through a communication bus. For example, CAN (Controller Area Network), KL15, KL87 or special frames are used for communication.

[0095] In some embodiments of the present disclosure, as shown in Figure 9 Figure 9 As shown in FIG. 6, the heating module according to one or more embodiments includes a voltage sampling circuit 22 configured to collect voltage information of the first capacitor C1, and the voltage information of the first capacitor C1 is used to determine whether at least one of the third switch S3 and the fifth switch S5 is in a conducting state after the energy storage assembly heating circuit exits the heating mode.

[0096] ​For example, after the energy storage assembly heating circuit exits self-heating, the third switch S3 and the fifth switch S5 are turned off, and the third switch S3 and the fifth switch S5 need to be detected for sticking. The second switch S2 and the fourth switch S4 are turned on, and the other switches are turned off. Whether the third switch S3 is stuck is identified by detecting the voltage information of the first capacitor C1. In the case that the first capacitor C1 has the first voltage, it is determined that the third switch S3 is in the on state, and in the case that the first capacitor C1 does not have the first voltage, it is determined that the third switch S3 is in the off state.

[0097] In this embodiment, whether the third switch S3 is stuck is detected, and in the case of sticking, the third switch S3 is turned off in time, reducing the problem of pre-charging of the first capacitor C1 caused by sticking of the third switch S3 in the next self-heating process of the energy storage assembly heating circuit.

[0098] In some embodiments, in the case that the third switch S3 is in the off state, the third switch circuit is turned on, the fifth switch S5 is in the on state in the case that the first capacitor C1 has the second voltage, and the fifth switch S5 is in the off state in the case that the first capacitor C1 does not have the second voltage.

[0099] For example, the seventh upper bridge arm V7 is turned on, and the voltage of the first capacitor C1 is detected. If the first capacitor C1 has voltage, it means that the fifth switch S5 is stuck, and if the first capacitor C1 does not have voltage, it means that the fifth switch S5 is not stuck. If the fifth switch S5 is stuck, the fifth switch S5 is turned off in time to reduce the influence on the second energy storage assembly BT2 or the heating module 2 in the state that the second energy storage assembly BT2 and the heating module 2 are connected before the energy storage assembly heating circuit is self-heated.

[0100] In addition, by setting the voltage sampling circuit, voltage control can be realized in time, the occurrence of overvoltage problems is reduced, and the function of circuit overvoltage protection is played.

[0101] In some embodiments, the heating module 2 further includes a temperature acquisition circuit 23 configured to acquire temperature information of the first bridge arm branch, and the temperature information of the first bridge arm branch is used to determine whether the energy storage assembly heating circuit exits the heating mode.

[0102] For example, if the temperature information of the first bridge arm branch is greater than a temperature threshold, it means that the temperature of the heating module is too high, which may cause damage to the internal components of the heating module. Therefore, the energy storage assembly heating circuit needs to exit the heating mode. If the temperature information of the first bridge arm branch is less than or equal to the temperature threshold, it means that the heating module can work normally, and therefore the energy storage assembly heating circuit can continue to be in the heating mode. By detecting the temperature information of the first bridge arm branch, this embodiment can reduce the risk of damage to the heating module and improve the safety of normal and stable operation of the entire circuit.

[0103] In some embodiments, the heating module 2 further comprises a current sampling circuit 24 configured to collect current information of the fifth switch, and the current information of the fifth switch is used as a current adjustment amount.

[0104] For example, by detecting the current information of the fifth switch S5, the PWM size output to each switch circuit in the first bridge arm branch and the second bridge arm branch can be determined, and then the PWM can be adjusted according to actual conditions, so as to achieve the purpose of adjusting the size of the current flowing through the motor winding and entering the energy storage component. In addition, by setting the current sampling circuit, the occurrence of overcurrent problem can be prevented, and the function of overcurrent protection is played.

[0105] In some embodiments, the energy storage component heating circuit further comprises a cooling device 7 configured to cool the heating module 2.

[0106] For example, the cooling device is a whole vehicle thermal management system, which comprises a cooling water inlet and a cooling water outlet, and the whole vehicle thermal management system provides cooling water circulation to the heating module, so as to achieve the purpose of cooling the heating module and reduce the occurrence of overheating of the heating module.

[0107] In some embodiments, the energy storage component heating circuit further comprises a low-voltage energy storage component 8 configured to provide voltage to the heating module 2.

[0108] For example, the low-temperature energy storage component provides low-voltage power supply to the heating module 2, and the ground of the heating module is connected to the ground of the whole vehicle.

[0109] The control logic of the energy storage component heating circuit will be described below. Figures 2 to 9

[0110] In the first stage, i.e. before self-heating of the energy storage component, the first capacitor C1 needs to be pre-charged, i.e. the first energy storage component BT1 charges the first capacitor C1, so that the voltage of the first capacitor C1 is consistent with that of the first energy storage component BT1 and the second energy storage component BT2, so as to prevent the fifth switch S5 from being burned when the fifth switch S5 is closed subsequently.

[0111] In the second stage after the first stage, i.e. during the self-heating process of the energy storage component, oscillating current is generated between the first energy storage component BT1 and the second energy storage component BT2, so as to realize self-heating of the first energy storage component BT1 and the second energy storage component BT2.

[0112] ​Through the above embodiment, based on the energy storage assembly heating circuit, logical control is performed, which can more safely charge and discharge between two energy storage assemblies, so as to generate oscillation current in the two energy storage assemblies, improve the energy storage assembly heating rate. In addition, in the process, the electric drive module does not generate torque, so it can also reduce noise, vibration and sound roughness, and improve the NVH (Noise, Vibration, Harshness) performance of the vehicle.

[0113] In some embodiments of the present disclosure, the first stage is divided into three stages, that is, the first stage includes a first sub-stage, a second sub-stage and a third sub-stage. In the first sub-stage, the second switch, the fourth switch, the first switch, the fifth switch are turned on, and the third switch is turned off; in the second sub-stage, the first switch circuit and the third switch circuit are turned on, and the second switch circuit and the fourth switch circuit are turned off; in the third sub-stage, the second switch, the third switch, the fourth switch and the fifth switch are turned on, and the first switch is turned off.

[0114] For example, in the first sub-stage, the second switch S2 and the fourth switch S4 are first closed, and the current flows back from the positive terminal of the first energy storage assembly BT1, the second switch S2, the second capacitor C2, the fourth switch S4 to the negative terminal of the first energy storage assembly BT1. If the energy storage assembly heating circuit includes a sixth switch K1 and a resistor R, the sixth switch K1 is closed before the second switch S2 and the fourth switch S4 are closed, and the second capacitor C2 is pre-charged. Since the resistor R is arranged on the branch where the sixth switch K1 is located, the damage of the second capacitor C1 caused by large current is reduced. After the second switch S2 and the fourth switch S4 are closed, the fifth switch S5 and the first switch S1 are closed, and the third switch S3 is turned off. Since the first capacitor C1 has no voltage at the beginning, if the second switch S2, the fourth switch S4, the fifth switch S5 and the first switch S1 are closed at the same time, a large current will flow through the first capacitor C1, which will cause damage to the first capacitor C1. Therefore, the second switch S2 and the fourth switch S4 are first closed, and then the fifth switch S5 and the first switch S1 are closed, and the third switch S3 is turned off, so that the current flowing through the first capacitor C1 increases slowly, reducing the risk of damage to the first capacitor C1.

[0115] In the second sub-stage, the motor is controlled to enter the Buck mode, for example, the first upper bridge arm V1, the second upper bridge arm V2, the third upper bridge arm V3 and the seventh upper bridge arm V7 are turned on, and the fourth lower bridge arm V4, the fifth lower bridge arm V5, the sixth lower bridge arm V6 and the eighth lower bridge arm V8 are turned off, so that the current flows as shown in Figure 10 Figure 10 is a current flow direction schematic diagram of the energy storage assembly heating circuit according to one or more embodiments, and the Figure 10 ​The heating circuit of the energy storage assembly is simplified. The first energy storage assembly BT1 and the second energy storage assembly BT2 are connected in parallel. The current flows from the positive terminal connection point of the first energy storage assembly BT1 and the second energy storage assembly BT2, through the first upper bridge arm V1, the motor winding (R1, L1), the fifth switch S5, the motor winding (R2, L2), the fifth switch S5, the motor winding (R3, L3), and the fifth switch S5, and then flows back to the negative terminal connection point of the first energy storage assembly BT1 and the second energy storage assembly BT2 through the seventh upper bridge arm V7, the first capacitor C1, and the fourth switch S4.

[0116] Alternatively, the first upper bridge arm V1, the second upper bridge arm V2, and the third upper bridge arm V3 are turned on, and the fourth lower bridge arm V4, the fifth lower bridge arm V5, the sixth lower bridge arm V6, the seventh upper bridge arm V7, and the eighth lower bridge arm V8 are turned off. The first energy storage assembly BT1 and the second energy storage assembly BT2 are connected in parallel. The current flows from the positive terminal connection point of the first energy storage assembly BT1 and the second energy storage assembly BT2, through the first upper bridge arm V1, the motor winding (R1, L1), the fifth switch S5, the motor winding (R2, L2), the fifth switch S5, the motor winding (R3, L3), and the fifth switch S5, and then flows back to the negative terminal connection point of the first energy storage assembly BT1 and the second energy storage assembly BT2 through the seventh upper bridge diode D7, the first capacitor C1, and the fourth switch S4.

[0117] In the third sub-stage, the third switch S3 is closed, and the first switch S1 is opened, and then the self-heating mode control of the energy storage assembly starts.

[0118] In the above embodiment, the pre-charging of the first capacitor C1 is realized, so that the voltage of the first capacitor C1 is consistent with that of the second energy storage assembly BT2.

[0119] In some embodiments, the second stage is divided into four stages, i.e., the second stage includes a fourth sub-stage, a fifth sub-stage, a sixth sub-stage, and a seventh sub-stage.

[0120] In the fourth sub-stage, the first switch circuit and the fourth switch circuit are turned on, and the second switch circuit and the third switch circuit are turned off.

[0121] For example, the first upper bridge arm V1, the second upper bridge arm V2, the third upper bridge arm V3, and the eighth lower bridge arm V8 are turned on, and the fourth lower bridge arm V4, the fifth lower bridge arm V5, the sixth lower bridge arm V6, and the seventh upper bridge arm V7 are turned off. As shown in FIG. 8, wherein, Figure 11 Figure 11 ​A schematic diagram of current flow for a heating circuit of an energy storage assembly according to one or more embodiments. Current flows out of the positive terminal of the first energy storage assembly BT1, through the second switch S2, through the first upper bridge arm V1, through the motor windings (R3, L3) to the fifth switch S5, through the second upper bridge arm V2, through the motor windings (R2, L2) to the fifth switch S5, through the third upper bridge arm V3, through the motor windings (R1, L1) to the fifth switch S5, and then through the eighth lower bridge arm V8, the fourth switch S4 back to the first energy storage assembly BT1. At this time, the charging of the inductors L1, L2, and L3 by the first energy storage assembly BT1 is achieved.

[0122] In the fifth sub-phase, the first and third switch circuits are on, and the second and fourth switch circuits are off.

[0123] For example, the first, second, third, and seventh upper bridge arms V1, V2, V3, V7 are on, and the fourth, fifth, sixth, and eighth lower bridge arms V4, V5, V6, V8 are off. As shown in FIG. 6B, where, Figure 12 Figure 12 A schematic diagram of current flow for a heating circuit of an energy storage assembly according to one or more embodiments. Current flows out of the positive terminal of the first energy storage assembly BT1, through the second switch S2, through the first upper bridge arm V1, through the motor windings (R3, L3) to the fifth switch S5, through the second upper bridge arm V2, through the motor windings (R2, L2) to the fifth switch S5, through the third upper bridge arm V3, through the motor windings (R1, L1) to the fifth switch S5, and then through the seventh upper bridge arm V7, the third switch S3 to the positive terminal of the second energy storage assembly BT2. At the same time, current flows through the seventh upper bridge arm V7, the first capacitor C1, the fourth switch S4 back to the negative terminals of the first and second energy storage assemblies BT1, BT2. The sum of the voltages of the first energy storage assembly BT1 and the inductors L1, L2, L3 is greater than the voltage of the second energy storage assembly BT2, and thus the charging of the second energy storage assembly BT2 by the first energy storage assembly BT1 and the inductors L1, L2, L3 is achieved.

[0124] In the sixth sub-phase, the second and third switch circuits are on, and the first and fourth switch circuits are off.

[0125] For example, the fourth, fifth, sixth, and seventh upper bridge arms V4, V5, V6, V7 are on, and the first, second, third, and eighth lower bridge arms V1, V2, V3, V8 are off. As shown in FIG. 6E, where, Figure 13 Figure 13 ​​Fig. 6 is a schematic diagram of current flow for a heating circuit of a storage assembly according to one or more embodiments. Current flows out of the positive terminal of the second storage assembly BT2, through the third switch S3, the seventh upper bridge arm V7, the fifth switch S5, through the motor winding (R1, L1), the third upper bridge arm V3, the second switch S2 to the positive terminal of the first storage assembly BT1, through the motor winding (R2, L2), the second upper bridge arm V2, the second switch S2 to the positive terminal of the first storage assembly BT1, through the motor winding (R3, L3), the first upper bridge arm V1, the second switch S2 to the positive terminal of the first storage assembly BT1. At the same time, current flows through the third switch S3, the first capacitor C1, the fourth switch S4 to the negative terminal of the first storage assembly BT1 and the second storage assembly BT2. Since the sum of the voltage of the second storage assembly BT2 and the inductance L1, L2, L3 is greater than the voltage of the first storage assembly BT1, the charging of the first storage assembly BT1 by the voltage of the second storage assembly BT2 and the inductance L1, L2, L3 is achieved.

[0126] In the seventh sub-stage, the first switch circuit and the third switch circuit are turned on, and the second switch circuit and the fourth switch circuit are turned off.

[0127] For example, the first upper bridge arm V1, the second upper bridge arm V2, the third upper bridge arm V3, the seventh upper bridge arm V7 are turned on, and the fourth lower bridge arm V4, the fifth lower bridge arm V5, the sixth lower bridge arm V6, the eighth lower bridge arm V8 are turned off. As shown in FIG. 6, wherein, Figure 14 Figure 14 Fig. 6 is a schematic diagram of current flow for a heating circuit of a storage assembly according to one or more embodiments. Current flows out of the positive terminal of the second storage assembly BT2, through the third switch S3, the seventh upper bridge arm V7, the fifth switch S5, through the motor winding (R1, L1), the third upper bridge arm V3, the second switch S2 to the positive terminal of the first storage assembly BT1, through the motor winding (R2, L2), the second upper bridge arm V2, the second switch S2 to the positive terminal of the first storage assembly BT1, through the motor winding (R3, L3), the first upper bridge arm V1, the second switch S2 to the positive terminal of the first storage assembly BT1. At the same time, current flows through the third switch S3, the first capacitor C1, the fourth switch S4 to the negative terminal of the first storage assembly BT1 and the second storage assembly BT2. Since the sum of the voltage of the second storage assembly BT2 and the inductance L1, L2, L3 is greater than the voltage of the first storage assembly BT1, the charging of the first storage assembly BT1 by the voltage of the second storage assembly BT2 and the inductance L1, L2, L3 is achieved.

[0128] ​In the above embodiment, the inductor is first charged by the first energy storage assembly BT1, then the second energy storage assembly BT2 is charged by the first energy storage assembly BT1 and the inductor, then the inductor is charged by the second energy storage assembly BT2, and finally the first energy storage assembly BT2 is charged by the second inductor BT2 and the inductor, realizing the heating of the double-branch parallel energy storage assembly. In this embodiment, the first capacitor C1 and the second capacitor C2 are not used as energy storage elements, but are used to stabilize the voltage, thus reducing the thermal risk of the capacitor and improving the self-heating efficiency of the energy storage assembly. Moreover, during the self-heating process of the energy storage assembly, the electric drive does not generate torque, thus improving the NVH performance of the vehicle.

[0129] In the above embodiment, by controlling the PWM size of the first upper bridge arm V1, the second upper bridge arm V2, the third upper bridge arm V3, the seventh upper bridge arm V7, the fourth lower bridge arm V4, the fifth lower bridge arm V5, the sixth lower bridge arm V6, and the eighth lower bridge arm V8, the current flowing through the inductor and the current entering the energy storage assembly can be adjusted. For example, by using the current acquisition circuit to collect the current flowing through the fifth switch S5, if the current is too large or for a long time, the PWM of the bridge arm is adjusted to adjust the inductor current.

[0130] In some embodiments, in a third stage after the second stage, the first capacitor C1 discharges, reducing the life of the capacitor which remains in an electric state after the energy storage assembly completes the self-heating process, and also improving the safety factor of the circuit.

[0131] For example, in the case where the first bridge arm branch and the electric drive module 1 share the same switch, in the third stage, the fifth switch S5 is turned on, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are turned off, the first switch circuit and the fourth switch circuit are disconnected, the second switch S2 circuit is turned on, and the third switch circuit is turned on at a predetermined duty ratio.

[0132] The heating module 2 is on the branch connected to one end of the fourth switch S4, and there is no other switch. The fifth switch S5 is closed, and the other switches are open. The fourth lower bridge arm V4, the fifth lower bridge arm V5, and the sixth lower bridge arm V6 are turned on, the first upper bridge arm V1, the second upper bridge arm V2, the third upper bridge arm V3, and the eighth lower bridge arm V8 are turned off, a PWM wave with a predetermined duty ratio is provided to the seventh upper bridge arm V7, and the first capacitor discharges through the motor winding, reducing the impact of the first capacitor C1 on the life due to the constant voltage. As shown in Figure 15 Figure 15 ​A schematic diagram of the current flow of the heating circuit of the energy storage assembly according to one or more embodiments. The current flows out of one end of the first capacitor C1, through the seventh upper bridge arm V7, the fifth switch S5, and then through the motor windings (R1, L1), the sixth lower bridge arm V6, the first sub-switch S41, and the second sub-switch S42 back to the first capacitor C1, through the motor windings (R2, L2), the fifth lower bridge arm V5, the first sub-switch S41, and the second sub-switch S42 back to the first capacitor C1, through the motor windings (R3, L3), the fourth lower bridge arm V4, the first sub-switch S41, and the second sub-switch S42 back to the first capacitor C1.

[0133] For another example, in the case where the second bridge arm bus end of the electric drive module is electrically connected to the negative terminal of the first energy storage assembly through the first sub-switch, and the second end of the first bridge arm branch is electrically connected to the negative terminal of the first energy storage assembly through the second sub-switch, in the third phase, the fifth switch, the first sub-switch, and the second sub-switch are turned on, the first switch, the second switch, the first sub-switch, and the third switch are turned off, the first switch circuit and the fourth switch circuit are turned off, the second switch circuit is turned on, and the third switch circuit is turned on at a predetermined duty ratio.

[0134] The fifth switch S5, the first sub-switch S41, and the second sub-switch S42 are turned on, and the other switches are turned off. The fourth lower bridge arm V4, the fifth lower bridge arm V5, and the sixth lower bridge arm V6 are turned on, and the first upper bridge arm V1, the second upper bridge arm V2, the third upper bridge arm V3, and the eighth lower bridge arm V8 are turned off. A PWM wave of a predetermined duty ratio is provided to the seventh upper bridge arm V7. The first capacitor discharges through the motor windings, reducing the impact of the constant voltage on the life of the first capacitor C1. As shown in Figure 16 Figure 16 A schematic diagram of the current flow of the heating circuit of the energy storage assembly according to one or more embodiments. The current flows out of one end of the first capacitor C1, through the seventh upper bridge arm V7, the fifth switch S5, and then through the motor windings (R1, L1), the sixth lower bridge arm V6, the first sub-switch S41, and the second sub-switch S42 back to the first capacitor C1, through the motor windings (R2, L2), the fifth lower bridge arm V5, the first sub-switch S41, and the second sub-switch S42 back to the first capacitor C1, through the motor windings (R3, L3), the fourth lower bridge arm V4, the first sub-switch S41, and the second sub-switch S42 back to the first capacitor C1.

[0135] For another example, the second bridge arm bus end of the electric drive module 1 is electrically connected to the negative terminal of the first energy storage assembly BT1 through the first sub-switch S41; the second end of the first bridge arm branch is electrically connected to the negative terminal of the first energy storage assembly BT1 through the second sub-switch S42 and the first sub-switch S41. In the third phase, the fifth switch S5 and the second sub-switch S42 are turned on, the first switch S1, the second switch S2, the first sub-switch S41, and the third switch S3 are turned off, the first switch circuit and the fourth switch circuit are turned off, the second switch circuit is turned on, and the third switch circuit is turned on at a predetermined duty ratio.

[0136] ​Those skilled in the art should understand that the second capacitor C2 can also be discharged, which will not be further elaborated here.

[0137] In some embodiments, in a fourth stage after the third stage, the third switch S3 and the fifth switch S5 are disconnected, and the sticking situation detection is performed on the third switch S3 and the fifth switch S5.

[0138] For example, the third switch S3 and the fifth switch S5 are disconnected, the second switch S2 and the fourth switch S4 are turned on, in the case that the first capacitor C1 has the first voltage, the third switch S3 is in the on state, and in the case that the first capacitor C1 does not have the first voltage, the third switch S3 is in the off state.

[0139] In this embodiment, the voltage information of the first capacitor C1 collected by the voltage sampling circuit can be used for judgment, which facilitates the identification of whether the third switch exists a sticking situation after the energy storage assembly heating circuit exits the self-heating mode. If the third switch S3 exists a sticking situation, the third switch S3 can be disconnected in time so as to interfere with the pre-charging of the first capacitor C1 before starting the self-heating mode next time.

[0140] For another example, in the case that the third switch S3 is in the off state, the third switch circuit is turned on, in the case that the first capacitor C1 has the second voltage, the fifth switch S5 is in the on state, and in the case that the first capacitor C1 does not have the second voltage, the fifth switch S5 is in the off state.

[0141] In this embodiment, the seventh upper bridge arm V7 is turned on, and the voltage information of the first capacitor C1 collected by the voltage sampling circuit is used for judgment, which facilitates the identification of whether the fifth switch S5 exists a sticking situation after the energy storage assembly heating circuit exits the self-heating mode. If the fifth switch S5 exists a sticking situation, the fifth switch S5 can be disconnected in time, thereby reducing the influence on the second energy storage assembly BT2 or the heating module 2 in the connection state of the second energy storage assembly BT2 and the heating module 2 before the energy storage assembly heating circuit is self-heated.

[0142] Figures 10-16 The energy storage assembly heating circuit in any one of the above embodiments corresponds to the energy storage assembly heating circuit shown in FIG. 1. Figure 2 The energy storage assembly heating circuit is simplified for the sake of clarity of the current flow direction. Those skilled in the art can understand that the energy storage assembly heating circuit in any one of the above embodiments can also be used for the energy storage assembly heating circuit shown in FIG. 1. Figures 2 to 8 The energy storage assembly heating circuit in any one of the above embodiments can also be used for the energy storage assembly heating circuit shown in FIG. 1.

[0143] In another embodiment of the present disclosure, a vehicle is protected, which uses an energy storage assembly to provide kinetic energy. The vehicle includes the energy storage assembly heating circuit in the above embodiments. The vehicle can still maintain good running performance in a low-temperature environment.

[0144] The above description of various embodiments tends to emphasize differences between various embodiments, and the same or similar elements can be referred to each other, and for brevity, will not be described herein.

[0145] So far, the present application has been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0146] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An energy storage component heating circuit, characterized in that: include: a first energy storage component; a second energy storage assembly, wherein the positive terminal of the second energy storage assembly is electrically connected to the positive terminal of the first energy storage assembly through a first switch, and the negative terminal of the second energy storage assembly is electrically connected to the negative terminal of the first energy storage assembly; An electric drive module, wherein a first bridge arm bus terminal of the electric drive module is electrically connected to a positive terminal of the first energy storage component via a second switch; The heating module includes a first bridge arm branch and a first capacitor arranged in parallel, the first end of the first bridge arm branch is electrically connected to the positive end of the second energy storage component through a third switch, the second end of the first bridge arm branch and the second bridge arm bus end of the electric drive module are electrically connected to the negative end of the first energy storage component through a fourth switch, and the first node between the two switching circuits of the first bridge arm branch is electrically connected to the motor winding bus end of the electric drive module through a fifth switch.

2. The energy storage component heating circuit according to claim 1, characterized in that: The heating module further comprises: The voltage sampling circuit is configured to collect voltage information of the first capacitor, and the voltage information of the first capacitor is used to determine whether at least one of the third switch and the fifth switch is in an on state after the energy storage component heating circuit exits the heating mode.

3. The energy storage component heating circuit according to claim 1, characterized in that: The heating module further comprises: The temperature acquisition circuit is configured to acquire temperature information of the first bridge arm branch, and the temperature information of the first bridge arm branch is used to determine whether the energy storage component heating circuit exits the heating mode.

4. The energy storage component heating circuit according to any one of claims 1 to 3, characterized in that: The heating module further comprises: The current sampling circuit is configured to collect current information flowing through the fifth switch, and the current information of the fifth switch is used as a current adjustment variable.

5. The energy storage component heating circuit according to claim 1, characterized in that: The fourth switch includes a first sub-switch and a second sub-switch, wherein: The second bridge arm bus terminal of the electric drive module is electrically connected to the negative terminal of the first energy storage component through the first sub-switch; The second end of the first bridge arm branch is electrically connected to the negative terminal of the first energy storage component through the second sub-switch.

6. The energy storage component heating circuit according to claim 1, characterized in that: The fourth switch includes a first sub-switch and a second sub-switch, wherein: The second bridge arm bus terminal of the electric drive module is electrically connected to the negative terminal of the first energy storage component through the first sub-switch; The second end of the first bridge arm branch is electrically connected to the negative terminal of the first energy storage component through the second sub-switch and the first sub-switch.

7. The energy storage component heating circuit according to claim 1, characterized in that: Also includes: The first current protector is arranged between the first bridge arm bus terminal of the electric drive module and the positive terminal of the first energy storage component.

8. The energy storage component heating circuit according to claim 1, characterized in that: Also includes: The second current protector is arranged between the second bridge arm bus terminal of the electric drive module and the negative terminal of the first energy storage component.

9. The energy storage component heating circuit according to claim 1, characterized in that: Also includes: The second current protector is arranged between the first end of the first bridge arm branch and the positive terminal of the second energy storage component.

10. The energy storage component heating circuit according to claim 1, characterized in that: The electric drive module includes a second capacitor, and the energy storage component heating circuit also includes a sixth switch and a resistor arranged in series, wherein: The sixth switch and resistor arranged in series are arranged between the first bridge arm bus terminal of the electric drive module and the positive terminal of the first energy storage component, or are arranged between the second bridge arm bus terminal of the electric drive module and the negative terminal of the first energy storage component.

11. The energy storage component heating circuit according to claim 1, characterized in that: The first switch, the second switch, the third switch, the fourth switch and the fifth switch are located in the same housing.

12. The energy storage component heating circuit according to any one of claims 1 to 3 and 5 to 11, characterized in that: The electric drive module includes a motor and multiple second bridge arm branches arranged in parallel, each second bridge arm branch includes a first switching circuit and a second switching circuit, the first bridge arm branch includes a third switching circuit and a fourth switching circuit, the first end of the first switching circuit is electrically connected to the first bridge arm bus end, the second end of the second switching circuit is electrically connected to the second bridge arm bus end, the second end of the first switching circuit and the first end of the second switching circuit are electrically connected to a second node, the second node is electrically connected to a phase winding of the motor, the first end of the third switching circuit is the first end of the first bridge arm branch, the second end of the fourth switching circuit is the second end of the first bridge arm branch, and the second end of the third switching circuit and the first end of the fourth switching circuit are electrically connected to the first node.

13. The energy storage component heating circuit according to claim 12, characterized in that: In the first stage, the first energy storage component charges the first capacitor; In a second stage following the first stage, an oscillating current is generated between the first energy storage component and the second energy storage component.

14. The energy storage component heating circuit according to claim 13, characterized in that: The first stage includes a first sub-stage, a second sub-stage and a third sub-stage, In the first sub-stage, the second switch, the fourth switch, the first switch, and the fifth switch are turned on, and the third switch is turned off; In the second sub-phase, the first switch circuit and the third switch circuit are turned on, and the second switch circuit and the fourth switch circuit are turned off; In the third sub-phase, the second switch, the third switch, the fourth switch, and the fifth switch are turned on, and the first switch is turned off.

15. The energy storage component heating circuit according to claim 13, characterized in that: The second stage includes a fourth sub-stage, a fifth sub-stage, a sixth sub-stage and a seventh sub-stage, In the fourth sub-stage, the first switch circuit and the fourth switch circuit are turned on, and the second switch circuit and the third switch circuit are turned off; In the fifth sub-stage, the first switch circuit and the third switch circuit are turned on, and the second switch circuit and the fourth switch circuit are turned off; In the sixth sub-stage, the second switch circuit and the third switch circuit are turned on, and the first switch circuit and the fourth switch circuit are turned off; In the seventh sub-phase, the first switching circuit and the third switching circuit are turned on, and the second switching circuit and the fourth switching circuit are turned off.

16. The energy storage component heating circuit according to claim 13, characterized in that: In a third stage following the second stage, the first capacitor is discharged.

17. The energy storage component heating circuit according to claim 16, characterized in that: In the case where the first bridge arm branch and the electric drive module share the same switch, In the third phase, the fifth switch is turned on, the first switch, the second switch, the third switch, and the fourth switch are turned off, the first switch circuit and the fourth switch circuit are disconnected, the second switch circuit is turned on, and the third switch circuit is turned on with a predetermined duty cycle.

18. The energy storage component heating circuit according to claim 16, characterized in that: When the second bridge arm bus terminal of the electric drive module is electrically connected to the negative terminal of the first energy storage component through the first sub-switch, and the second end of the first bridge arm branch is electrically connected to the negative terminal of the first energy storage component through the second sub-switch, In the third phase, the fifth switch, the first sub-switch, and the second sub-switch are turned on, the first switch, the second switch, and the third switch are turned off, the first switch circuit and the fourth switch circuit are disconnected, the second switch circuit is turned on, and the third switch circuit is turned on with a predetermined duty cycle.

19. The energy storage component heating circuit according to claim 16, characterized in that: In the case where the second bridge arm bus terminal of the electric drive module is electrically connected to the negative terminal of the first energy storage component through the first sub-switch, and the second end of the first bridge arm branch is electrically connected to the negative terminal of the first energy storage component through the second sub-switch and the first sub-switch, In the third stage, the fifth switch and the second sub-switch are turned on, the first switch, the second switch, the third switch, and the first sub-switch are turned off, the first switch circuit and the fourth switch circuit are disconnected, the second switch circuit is turned on, and the third switch circuit is turned on with a predetermined duty cycle.

20. The energy storage component heating circuit according to claim 16, characterized in that: In a fourth stage following the third stage, the third switch and the fifth switch are disconnected, and the second switch and the fourth switch are connected. When a first voltage is present on the first capacitor, the third switch is in an on state; when the first voltage is not present on the first capacitor, the third switch is in an off state.

21. The energy storage component heating circuit according to claim 20, characterized in that: When it is determined that the third switch is in the off state, the third switch circuit is turned on. When a second voltage exists on the first capacitor, the fifth switch is turned on. When the second voltage does not exist on the first capacitor, the fifth switch is turned off.

22. A vehicle, characterized in that: include: The energy storage component heating circuit according to any one of claims 1 to 21.

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