Onboard charging device and vehicle

Abstract

The application discloses a vehicle-mounted charging device and a vehicle. When the vehicle-mounted charging device is in a charging mode, a DC / DC conversion module is used for charging an energy storage device. The first inductor is required not to generate excessive heat, and a magnetic core material with low resistivity is preferably used. When the vehicle-mounted charging device is in a heating mode, the magnetic element is required to generate more heat, and a magnetic core material with high resistivity is preferably used. No matter the charging mode or the heating mode, the first DC conversion module, the transformer and the second DC conversion module are reused, the topology circuit and components are simplified, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and more particularly to an on-board charging device and an electric vehicle thereof. Background Technology

[0002] Batteries, as a power source, are widely used in the energy systems of pure electric and hybrid vehicles. However, at low ambient temperatures, the internal resistance of the battery increases, its overcurrent capacity decreases, and its discharge capacity weakens accordingly. Therefore, it is necessary to heat the battery to restore its normal discharge capacity.

[0003] In related technologies, a PTC (Positive Temperature Coefficient) heating scheme is commonly used. This involves heating the water circuit with a PTC heater, and then transferring heat to the battery through water circulation, causing the battery module's temperature to rise from the outer shell to the interior. However, indirectly heating the battery through the aforementioned PTC heating water circuit results in a long heating time and low heat exchange efficiency.

[0004] In other related technologies, an AC high-frequency heating circuit is embedded in the charger circuit. The charger and battery form a charging and discharging loop. Heat generated by the battery's internal resistance enables low-temperature heating of the battery without affecting the charger's normal charging function. At low temperatures, a low-temperature AC heating mode is activated first to heat the battery with AC high frequency, effectively preventing dendrite formation during low-temperature charging, improving battery charging safety, and not causing battery life degradation. However, this method requires an additional heating circuit, which includes at least one inductor and two switching transistors, increasing costs. Summary of the Invention

[0005] The purpose of this application is to at least partially solve one of the aforementioned technical problems.

[0006] Therefore, the first objective of this application is to provide an on-board charging device. This on-board charging device not only enables an external power source to charge an energy storage device, but also generates heat, which is conducted to the energy storage device through a heat exchange device to heat the energy storage device. This heating and charging function reuses some components, simplifying the circuit topology and components as much as possible, thus reducing costs.

[0007] The second objective of this application is to propose a vehicle with an on-board charging device.

[0008] To achieve the above objectives, the on-board charging device proposed in the first aspect of this application includes: a DC / DC conversion module, which includes a first DC conversion module, a transformer, and a second DC conversion module; the first DC conversion module is connected to a DC output terminal and the transformer; the second DC conversion module is connected to a DC input terminal and the transformer; the transformer includes a first coil and a second coil; the first DC conversion module includes a first switch, a second switch, a third switch, and a fourth switch, with a first terminal of the second switch connected to a second terminal of the first switch, and a first node between the first terminal of the second switch and the second terminal of the first switch; Section 1 A point is connected to one end of the first coil; the first end of the fourth switch is connected to the second end of the third switch, and a second node is formed between the first end of the fourth switch and the second end of the third switch; the second node is connected to the other end of the first coil through a charging branch; the second end of the second switch and the second end of the fourth switch are connected to the other end of the first coil through a heating branch; a controllable switch selectively connects the other end of the first coil to the charging branch or to the heating branch; the charging branch is equipped with a first inductor, and the heating branch is equipped with a magnetic element, the resistivity of the magnetic core material of the magnetic element being greater than the resistivity of the magnetic core material of the first inductor. When the on-board charging device is in charging mode, the DC / DC converter module is used to charge the energy storage device. The first inductor is required not to generate too much heat, and a magnetic core material with low resistivity is preferred. When the on-board charging device is in heating mode, the magnetic element is required to generate more heat, and a magnetic core material with higher resistivity is preferred. Regardless of whether it is charging mode or heating mode, the first DC converter module, transformer, and second DC converter module are reused, simplifying the topology and components and reducing costs.

[0009] The vehicle proposed in the second aspect of this application includes: the on-board charging device described in the first aspect of this application, and a battery thermal management system. The heat exchange device of the on-board charging device and the battery thermal management system exchange heat. The magnetic element in the on-board charging device generates heat and conducts it to the energy storage device through the heat exchange device and the battery thermal management system, thereby realizing the heating function of the energy storage device.

[0010] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0012] Figure 1This is a schematic block diagram of an on-board charging device according to an embodiment of this application.

[0013] Figure 2 This is a schematic block diagram of an on-board charging device according to another embodiment of this application.

[0014] Figure 3 This is an example circuit topology diagram of an on-board charging device according to an embodiment of this application.

[0015] Figure 4 This is a structural block diagram of a vehicle according to an embodiment of this application. Detailed Implementation

[0016] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0017] The following description, with reference to the accompanying drawings, describes an on-board charging device and a vehicle according to embodiments of this application.

[0018] Figure 1 This is a schematic block diagram of an on-board charging device according to one embodiment of this application. Figure 1 As shown, the on-board charging device 10 includes a DC / DC converter module. The two ends of the DC / DC converter module are a DC input terminal and a DC output terminal, respectively. The DC input terminal is connected to an external power supply 30, and the DC output terminal is connected to an energy storage device 20. Through the bidirectional power transmission of the DC / DC converter module, the energy storage device can be charged or discharged.

[0019] The DC / DC conversion module includes a first DC conversion module 11, a transformer 13, and a second DC conversion module 12. The first DC conversion module 11 is connected to the DC output terminal and the transformer 13 respectively. The second DC conversion module 12 is connected to the DC input terminal and the transformer 13 respectively. The transformer 13 includes a first coil S1 and a second coil S2. The coupling of the first coil S1 and the second coil S2 realizes isolated bidirectional conversion, ensuring the safety of charging or discharging the energy storage device 20.

[0020] Figure 3 This is an example circuit topology diagram of an on-board charging device according to an embodiment of this application, such as... Figure 3As shown, the first DC conversion module 11 includes a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4. The first end of the second switch Q2 is connected to the second end of the first switch Q1, and a first node exists between the first end of the second switch Q2 and the second end of the first switch Q1. The first node is connected to one end of the first coil S1. The first end of the fourth switch Q4 is connected to the second end of the third switch Q3, and a second node exists between the first end of the fourth switch Q4 and the second end of the third switch Q3. The second node is connected to the other end of the first coil S1 via a charging branch 15, and a first capacitor C1 is disposed between the first node and one end of the first coil S1. When the external power supply 30 charges the energy storage device 20, the charging branch 15 is turned on. Through the on / off switching of the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4, the first DC conversion module 11 achieves rectification, thus charging the energy storage device 20.

[0021] In one embodiment of this application, the second end of the second switch Q2 and the second end of the fourth switch Q4 are connected to the other end of the first coil S1 through the heating branch 16. Specifically, the second end of the second switch Q2 and the second end of the fourth switch Q4 are connected to form a bus terminal, which is connected to the other end of the first coil S1 through the heating branch 16. When the on-board charging device is in heating mode, the heating branch 16 is turned on. Through the on-off or off-off of the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4, a resonant current is generated on the heating branch 16.

[0022] In one embodiment of this application, such as Figure 1 and Figure 3 As shown, the on-board charging device includes a controllable switch 14, which is a selective switch including a contact S1 and contactors K1 and K2. The controllable switch 14 selectively connects the other end of the first coil S1 to the charging branch 15 or connects the other end of the first coil S1 to the heating branch 16. For example, when the contact S1 is connected to the contactor K1, the other end of the first coil S1 is connected to the charging branch 15, and when the contact S1 is connected to the contactor K2, the other end of the first coil S1 is connected to the heating branch 16.

[0023] The charging branch 15 is equipped with a first inductor L1, and the heating branch 16 is equipped with a magnetic element 18. The resistivity of the magnetic core material of the magnetic element 18 is greater than that of the magnetic core material of the first inductor L1. The difference between the first inductor L1 and the magnetic element 18 is that they are made of different magnetic core materials. The magnetic core material of the magnetic element 18 has a higher resistivity. When a resonant current is generated in the heating branch 16, the magnetic element 18 can generate more heat.

[0024] In one embodiment of this application, the core material of the first inductor L1 is ferrite, and the magnetic element 18 includes a core and a coil. The resistivity of the core material of the magnetic element 18 is higher than that of ferrite.

[0025] According to embodiments of this application, when the on-board charging device 10 is in charging mode, the DC / DC converter module is used to charge the energy storage device. The first inductor L1 is required not to generate too much heat, and a magnetic core material with low resistivity is preferred. When the on-board charging device 10 is in heating mode, the magnetic element 18 is required to generate more heat, and a magnetic core material with higher resistivity is preferred. Regardless of whether it is charging or heating mode, the first DC converter module 11, the transformer 13, and the second DC converter module 12 are reused, simplifying the topology and components and reducing costs.

[0026] According to an embodiment of this application, the on-board charging device 10 includes a control module 17, which is connected to the control terminals of the first DC conversion module 11, the second DC conversion module 12, and a controllable switch 14. When the control module 17 receives a charging signal, it controls the controllable switch 14 to turn on the charging branch 15, and then controls the first DC conversion module 11 and the second DC conversion module 12 to charge the energy storage device 20 from the external power supply 30. When the control module 17 receives a heating signal, it controls the controllable switch 14 to turn on the heating branch 16, and then controls the first DC conversion module 11 and the second DC conversion module 12 to generate heat from the magnetic element 18.

[0027] Figure 2 This is a schematic block diagram of an on-board charging device according to another embodiment of this application, such as... Figure 2 As shown, the second DC conversion module 12 includes a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, and an eighth switch Q8. The first end of the sixth switch Q6 is connected to the second end of the fifth switch Q5, and a third node is located between the first end of the sixth switch Q6 and the second end of the fifth switch Q5. The third node is connected to one end of the second coil S2 through a second capacitor C2. The first end of the eighth switch Q8 is connected to the second end of the seventh switch Q7, and a fourth node is located between the first end of the eighth switch Q8 and the second end of the seventh switch Q7. The second node is connected to the other end of the first coil S2 through a second inductor L2. When the on-board charging device 10 is in heating or charging mode, the control module 17 controls the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 to turn on or off, thereby realizing the inverter function.

[0028] like Figure 1As shown, when the external power supply 30 is a DC power supply, the DC input terminal is connected to the DC power supply 30, and the DC output terminal is connected to the energy storage device 20. When the control module 17 controls the other end of the first coil S1 to be connected to the charging branch 15, the DC power supply charges the energy storage device 20 through the DC / DC conversion module. When the control module 17 controls the other end of the first coil S1 to be connected to the heating branch 16, the DC power supply generates heat in the magnetic element 18 through the DC / DC conversion module.

[0029] like Figure 3 As shown, the on-board charging device 10 also includes an AC / DC conversion module 19. The AC / DC conversion module includes a ninth switch Q9, a tenth switch Q10, an eleventh switch Q11, a twelfth switch Q12, a thirteenth switch Q13, and a fourteenth switch Q14. The control module 17 controls the ninth switch Q9, the tenth switch Q10, the eleventh switch Q11, the twelfth switch Q12, the thirteenth switch Q13, and the fourteenth switch Q14 to be turned on or off according to a preset control mode, so that the AC / DC conversion module 19 can realize the rectification function.

[0030] When the external power supply 30 is an AC power supply, the DC input terminal is connected to the AC power supply through the AC / DC conversion module, the control module 17 is connected to the control terminal of the AC / DC conversion module 19, and the DC output terminal is connected to the energy storage device. When the control module 17 controls the other end of the first coil S1 to be connected to the charging branch 15, the AC power supply charges the energy storage device through the AC / DC conversion module 19 and the DC / DC conversion module. When the control module 17 controls the other end of the first coil to be connected to the heating branch 16, the AC power supply generates heat in the magnetic element 18 through the AC / DC conversion module and the DC / DC conversion module.

[0031] In one embodiment of this application, when the control module 17 controls the other end of the first coil S1 to be connected to the heating branch 16, the second switch Q2 is continuously turned on, and the first switch Q1, the third switch Q3 and the fourth switch Q4 are continuously turned off. That is, when the on-board charging device 10 is in the heating mode, one end of the first coil S1, the first capacitor C1, the second switch Q2, the magnetic element 18, the controllable switch 14 and the other end of the first coil S1 are connected in sequence to form a circuit.

[0032] In one embodiment of this application, when the on-board charging device 10 is in heating mode, the control module 17 controls the fifth switch Q5, the sixth switch Q6, the seventh switch Q7 and the eighth switch Q8 to be turned on or off according to a preset control method, so that a resonant current is generated on the magnetic element 18.

[0033] Figure 4This is a structural block diagram of a vehicle according to an embodiment of this application, such as... Figure 4 As shown, the on-board charging device 10 also includes a heat exchange device 101, in which a flowing coolant is disposed. The heat exchange device 101 exchanges heat with the magnetic element 18. When the on-board charging device 10 is in heating mode, the magnetic element 18 generates heat, which is then transferred to the energy storage device 20 through the coolant in the heat exchange device 101.

[0034] This application also proposes a vehicle 50, including an on-board charging device 10 and a battery thermal management system 21. The heat exchange device 101 of the on-board charging device and the battery thermal management system 21 are connected by a pipe 40 to achieve heat exchange. The magnetic element 18 in the on-board charging device generates heat, which is conducted to the energy storage device through the heat exchange device 101 and the battery thermal management system 21, thereby realizing the heating function of the energy storage device 20.

[0035] In the description of this application, it should be understood that the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth," "ninth," and "tenth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth," "ninth," and "tenth" may explicitly or implicitly include at least one of those features.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A vehicle-mounted charging device, characterized in that, include: The DC / DC conversion module includes a first DC conversion module, a transformer, and a second DC conversion module. The first DC conversion module is connected to both the DC output terminal and the transformer. The second DC conversion module is connected to both the DC input terminal and the transformer. The transformer includes a first coil and a second coil; The first DC conversion module includes a first switch, a second switch, a third switch, and a fourth switch. A first terminal of the second switch is connected to a second terminal of the first switch, and a first node is formed between the first terminal of the second switch and the second terminal of the first switch. The first node is connected to one end of the first coil. A first terminal of the fourth switch is connected to a second terminal of the third switch, and a second node is formed between the first terminal of the fourth switch and the second terminal of the third switch. The second node is connected to the other end of the first coil through a charging branch. The second end of the second switching transistor and the second end of the fourth switching transistor are connected to the other end of the first coil through a heating branch; A controllable switch includes a contact, a first contactor, and a second contactor, wherein when the contact is connected to the first contactor, the other end of the first coil is connected to the charging branch, and when the contact is connected to the second contactor, the other end of the first coil is connected to the heating branch. The charging branch is provided with a first inductor, and the heating branch is provided with a magnetic element. The resistivity of the magnetic core material of the magnetic element is greater than that of the magnetic core material of the first inductor. The on-board charging device has at least a charging mode for exchanging electrical energy with the energy storage device and a heating mode for conducting heat to the energy storage device through a heat exchange device and a battery thermal management system.

2. The on-board charging device according to claim 1, characterized in that, It also includes a control module, which is connected to the control terminal of the first DC conversion module, the control terminal of the second DC conversion module, and a controllable switch.

3. The on-board charging device according to claim 2, characterized in that, A first capacitor is provided between the first node and one end of the first coil.

4. The on-board charging device according to claim 3, characterized in that, The second DC conversion module includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch. The first end of the sixth switch is connected to the second end of the fifth switch, and a third node is located between the first end of the sixth switch and the second end of the fifth switch. The third node is connected to one end of the second coil through a second capacitor. The first end of the eighth switch is connected to the second end of the seventh switch, and a fourth node is located between the first end of the eighth switch and the second end of the seventh switch. The second node is connected to the other end of the first coil through a second inductor.

5. The on-board charging device according to claim 2, characterized in that, The DC input terminal is connected to a DC power supply, and the DC output terminal is connected to an energy storage device. When the control module controls the other end of the first coil to be connected to the charging branch, the DC power supply charges the energy storage device through the DC / DC converter module. When the control module controls the other end of the first coil to be connected to the heating branch, the DC power supply generates heat in the magnetic element through the DC / DC converter module.

6. The on-board charging device according to claim 2, characterized in that, It also includes an AC / DC conversion module. The DC input terminal is connected to an AC power source through the AC / DC conversion module. The control module is connected to the control terminal of the AC / DC conversion module. The DC output terminal is connected to an energy storage device. When the control module controls the other end of the first coil to be connected to the charging branch, the AC power source charges the energy storage device through the AC / DC conversion module and the DC / DC conversion module. When the control module controls the other end of the first coil to be connected to the heating branch, the AC power source generates heat in the magnetic element through the AC / DC conversion module and the DC / DC conversion module.

7. The on-board charging device according to claim 5 or 6, characterized in that, When the control module controls the other end of the first coil to be connected to the heating branch, the second switch tube is continuously turned on, while the first, third, and fourth switch tubes are continuously turned off.

8. The on-board charging device according to claim 7, characterized in that, The control module controls the fifth, sixth, seventh, and eighth switching transistors to turn on or off according to a preset control method, thereby generating a resonant current on the magnetic element.

9. The on-board charging device according to claim 7, characterized in that, It also includes a heat exchange device, in which a flowing coolant is provided, and the heat exchange device and the magnetic element achieve heat exchange through cooling.

10. A vehicle, characterized in that, Includes the on-board charging device and battery thermal management system as described in any one of claims 1 to 9; The heat exchange device of the on-board charging equipment exchanges heat with the battery thermal management system.

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