Vehicle-mounted booster and automobile

Abstract

The invention discloses a vehicle-mounted booster and an automobile, and relates to the field of charging boosting. The vehicle-mounted booster comprises a filtering module, a high-voltage relay and a boosting inductor which are connected in series, and a CIN capacitor and a capacitor relay which are connected in series are arranged between the positive electrode and the negative electrode of the output end of the filtering module; during boost charging, the high-voltage relay and the capacitor relay are closed, and cathode current flows into the cathode connecting end after being filtered by the filtering module; positive electrode current is filtered through the filtering module, boosted through the boost relay and then flows into the positive electrode connecting end. According to the invention, no relay is arranged on the negative electrode loop, so that the boost charging circuit and the direct charging circuit of the booster share one negative electrode; meanwhile, only one high-voltage relay and one capacitance relay are arranged on the positive pole loop; the capacitor relay not only can ensure the normal use of the CIN capacitor, but also is lower in cost.

Description

Technical Field

[0001] The invention relates to the field of charging and boosting, and in particular to a vehicle-mounted booster and a vehicle. Background Art

[0002] With the development of electric vehicles, electric vehicles are gradually sampling the 800VDC platform, while there are still a certain proportion of 500VDC charging piles on the market. When an electric vehicle encounters an emergency and needs to be charged but there are only 500VDC charging piles nearby, in order for the electric vehicle to be charged with a 500VDC charging pile, an on-board booster is required to boost the voltage to 800VDC to charge the electric vehicle.

[0003] Currently, the production cost of existing on-board boosters is relatively high, which in turn increases the cost of electric vehicles. Summary of the invention

[0004] In view of the defects existing in the prior art, the technical problem solved by the present invention is: how to reduce the cost of the vehicle-mounted booster while ensuring the normal use of charging and boosting.

[0005] To achieve the above objectives, in a first aspect, an embodiment of the present application provides a vehicle-mounted booster, comprising a filter module, a high-voltage relay and a boost inductor connected in series, wherein a CIN capacitor and a capacitor relay connected in series are arranged between the positive and negative electrodes of the output end of the filter module;

[0006] During boost charging, the high-voltage relay and the capacitor relay are closed, and the negative current is filtered by the filter module and then flows into the negative connection terminal; the positive current is filtered by the filter module, boosted by the boost relay, and then flows into the positive connection terminal.

[0007] In combination with the first aspect, in one implementation, the vehicle-mounted booster further includes a controller, which is used to:

[0008] The high-voltage relay is disconnected when non-boost charging is performed, and the high-voltage relay and the capacitor relay are closed when boost charging is performed;

[0009] Changing the working state of the high-voltage relay and the capacitor relay, and determining the working state of the high-voltage relay and the capacitor relay according to the voltage of the high-voltage relay and the capacitor relay; the working state includes the pull-in state and the disconnected state;

[0010] According to the voltage of the CIN capacitor, the charge of the CIN capacitor and whether it is in a safe state are determined. The safe state means that the capacitor voltage drops below a specified threshold within a specified time.

[0011] In combination with the first aspect, in one embodiment, the boost inductor has a built-in inductor temperature monitoring device; the controller is also used to: determine the temperature of the boost inductor according to the inductor temperature monitoring device, if the temperature of the boost inductor is not within a safe temperature range, adjust the boost charging power according to the temperature of the boost inductor.

[0012] In combination with the first aspect, in one embodiment, a high-voltage sampling connector and a low-voltage control connector are provided in the controller; the high-voltage sampling connector collects the filtered negative electrode voltage, the CIN capacitor voltage, and the voltage at the output end of the high-voltage relay through the high-voltage sampling circuit; the low-voltage control connector obtains the temperature of the inductor temperature monitoring device through the sampling control circuit, and changes the working state of the high-voltage relay and the capacitor relay.

[0013] In combination with the first aspect, in one implementation, the filtering module includes a differential common mode integrated magnetic ring, an X capacitor and a Y capacitor connected in parallel between the positive and negative poles.

[0014] In combination with the first aspect, in one implementation, the vehicle-mounted booster further includes a heat dissipation module for dissipating heat for the boost inductor.

[0015] In combination with the first aspect, in one embodiment, the heat dissipation module includes a thermal pad arranged at the bottom of the boost ground sensor, a cooling water channel is arranged in the thermal pad, and the cooling water channel is filled with coolant; the cooling water channel is connected to a cooling water nozzle for adding coolant.

[0016] In combination with the first aspect, in one embodiment, three relatively independent chambers are arranged in the shell of the vehicle-mounted booster, the boost inductor is located in the first chamber, the controller is located in the second chamber, and the high-voltage relay, capacitor relay and filter module are located in the third chamber; the second chamber is also provided with a controller shielding cover.

[0017] In combination with the first aspect, in one embodiment, the housing of the vehicle-mounted booster includes an upper housing assembly and a lower housing assembly, the waterproof levels of the upper housing assembly and the lower housing assembly are both above IP69, the upper housing assembly and the lower housing assembly are sealed by gluing, and the housing wall of the lower housing assembly is provided with a waterproof breathable valve;

[0018] The vehicle-mounted booster also includes an input connector for connecting to a charging pile, a direct-charge output connector for connecting to a battery pack, and a boost output connector for connecting to an electric drive; the input connector and the direct-charge output connector are connected in series via a copper busbar.

[0019] In a second aspect, an embodiment of the present application provides a car, comprising the vehicle-mounted booster provided in the first aspect.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] The present application does not have a relay on the negative pole circuit, so that the boost charging circuit and the direct charging circuit of the booster can share a negative pole; at the same time, the present application only has 1 high-voltage relay and 1 capacitor relay on the positive pole circuit; the capacitor relay can not only ensure the normal use of the CIN capacitor, but also has a low cost (the rated specifications are much lower than those of the high-voltage relay).

[0022] Therefore, the present application can reduce the cost of the vehicle-mounted booster while ensuring the normal use of charging and boosting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of a vehicle-mounted booster in an embodiment of the present invention;

[0025] Figure 2 The figure is a schematic diagram of the working principle of the vehicle-mounted booster in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0028] First, see Figure 1 and Figure 2 As shown, an embodiment of the present application provides a vehicle-mounted booster, comprising a filter module, a high-voltage relay (K1) and a boost inductor connected in series, and a CIN capacitor (input capacitor) and a capacitor relay (K2) connected in series are arranged between the positive and negative poles of the output end of the filter module.

[0029] During boost charging:

[0030] Close the high-voltage relay and capacitor relay, and the negative current of the charging pile will be filtered by the filter module and flow into the negative connection terminal (battery pack); the positive current of the charging pile will be filtered by the filter module and boosted by the boost relay in turn, and then flow into the positive connection terminal, and then it will be boosted by the three-phase inductor of the electric drive and flow into the positive electrode of the battery pack).

[0031] It can be seen that the present application does not have a relay on the negative pole circuit, so that the boost charging circuit and the direct charging circuit of the booster can share a negative pole; at the same time, the present application only has 1 high-voltage relay and 1 capacitor relay on the positive pole circuit; the capacitor relay can not only ensure the normal use of the CIN capacitor, but also has a low cost (the rated specifications are much lower than the high-voltage relay).

[0032] Therefore, the present application can reduce the cost of the vehicle-mounted booster while ensuring the normal use of charging and boosting.

[0033] In one embodiment, see Figure 1 As shown, the above-mentioned vehicle-mounted booster further includes a controller. The controller in this embodiment adopts PCBA (Printed Circuit Board Assembly).

[0034] PCBA is used for:

[0035] When non-boost charging is performed (i.e. the battery pack is directly connected to the charging pile for charging), the high-voltage relay is disconnected, and when boost charging is performed, the high-voltage relay and the capacitor relay are closed;

[0036] Monitors and controls voltage during charging.

[0037] The above-mentioned monitoring and controlling of voltage during charging specifically refers to:

[0038] Changing the working state of the high-voltage relay and the capacitor relay, and determining the working state of the high-voltage relay and the capacitor relay according to the voltage of the high-voltage relay and the capacitor relay; the working state includes the pull-in state and the disconnected state;

[0039] According to the voltage of CIN capacitor, determine the charge of CIN capacitor and whether it is in a safe state. The safe state means that the capacitor voltage drops below a specified threshold (generally 60V) within a specified time.

[0040] It can be seen that the working process of the vehicle-mounted booster of this application is:

[0041] Before charging, the controller pre-charges the CIN capacitor with the control battery pack through the buck circuit until the voltage difference between the CIN capacitor and the charging pile is within the specified range (5%).

[0042] During the charging process, the controller changes the working state of the high-voltage relay and capacitor relay (disconnecting or closing the relay) according to the charging method (direct charging or high-voltage charging), and determines whether the working state has been changed successfully through the voltage of the relay. If it has not been changed successfully, a prompt or alarm will be issued.

[0043] After charging is completed, the controller determines whether the CIN capacitor has reached a safe state based on the capacitor voltage. If not, it will issue a prompt or alarm.

[0044] Furthermore, the boost inductor has a built-in inductor temperature monitoring device (thermistor), see Figure 2 As shown, the thermistor in this embodiment is a NTC (Negative Temperature Coefficient thermistor); the controller is also used to: during the charging process, determine the temperature of the boost inductor according to the thermistor, if the temperature of the boost inductor is not in a safe state (not within the safe temperature range), then adjust the boost charging power according to the temperature of the boost inductor.

[0045] It should be noted that the above is an introduction to the execution process of the controller. In practice, the operation of the controller is controlled by the electric drive. For example, the controller feeds back the temperature of the boost inductor to the electric drive. The electric drive determines that it is not in a safe state, so it adjusts the boost charging power. Another example is that the electric drive sends a relay closing or disconnecting instruction to the controller.

[0046] For details, see Figure 2 As shown, a high-voltage sampling connector and a low-voltage control connector are provided in the controller; the high-voltage sampling connector collects the filtered negative electrode voltage, the CIN capacitor voltage, and the voltage at the output end of the high-voltage relay through a high-voltage sampling circuit (the red line segment in the figure); the low-voltage control connector changes the working state of the high-voltage relay and the capacitor relay through the sampling control circuit, and obtains the temperature of the inductor temperature monitoring device.

[0047] In one embodiment, see Figure 2 As shown, the filter module includes a differential common mode integrated magnetic ring, an X capacitor and a Y capacitor connected in parallel between the positive and negative electrodes. The X capacitor is used to eliminate differential mode interference, and the Y capacitor is used to be connected between the input line and the ground line to eliminate common mode interference.

[0048] In one embodiment, the vehicle-mounted booster further includes a heat dissipation module for dissipating heat for the boost inductor.

[0049] Specifically, water cooling is adopted in this embodiment. The heat dissipation module includes a thermal pad (bonded to the boost inductor) arranged at the bottom of the boost ground sensor. A cooling water channel is arranged in the thermal pad through the cast aluminum shell through the stir friction welding process. The cooling water channel is filled with coolant. The cooling water channel is connected to a cooling water nozzle for adding coolant. The cooling water nozzle adopts a detachable design, which can be adapted to quick-connect connectors of different calibers (such as VDA NW14, VDANW16, VDA NW18, etc.) according to customer needs. The inner diameter of the water nozzle is changed from the traditional round to the hexagonal form, which is convenient for installation and small in size.

[0050] In one embodiment, see Figure 1 As shown, three relatively independent chambers are arranged in the shell of the above-mentioned vehicle-mounted booster, the boost inductor is located in the first chamber, the controller is located in the second chamber, and the high-voltage relay, capacitor relay and filter module are located in the third chamber, so as to reduce the battery interference between each other.

[0051] For further information, see Figure 1 As shown, the second chamber where the controller is located is also provided with a controller shielding cover.

[0052] In one embodiment, see Figure 1 As shown, the shell of the above-mentioned vehicle-mounted booster includes an upper shell assembly and a lower shell assembly. The waterproof level of the upper shell assembly and the lower shell assembly can reach IP69. The upper shell assembly and the lower shell assembly are sealed with glue, and the shell wall of the lower shell assembly is provided with a waterproof breathable valve. In the case of extreme temperature changes, the pressure inside the booster cavity is balanced with the external air pressure, thereby ensuring that the booster is waterproof and sealed in extreme environments.

[0053] In one embodiment, see Figure 1 As shown, the above-mentioned vehicle-mounted booster also includes an input connector for connecting to a charging pile, a direct charging output connector for connecting to a battery pack, and a boost output connector for connecting to a three-phase inductor of an electric drive; the input connector and the direct charging output connector are connected in series through a copper busbar.

[0054] In a second aspect, an embodiment of the present invention provides a car, comprising the vehicle-mounted booster mentioned in the first aspect.

[0055] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0056] The terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0057] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0058] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0059] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0060] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0061] The above are only specific implementations of the embodiments of the present invention, but the protection scope of the embodiments of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the embodiments of the present invention, and these modifications or replacements should be included in the protection scope of the embodiments of the present invention. Therefore, the protection scope of the embodiments of the present invention shall be based on the protection scope of the claims.

Claims

1. A vehicle-mounted booster, characterized in that: It includes a filter module, a high-voltage relay and a boost inductor connected in series, and a CIN capacitor and a capacitor relay connected in series are arranged between the positive and negative electrodes of the output end of the filter module; During boost charging, the high-voltage relay and the capacitor relay are closed, and the negative current is filtered by the filter module and then flows into the negative connection terminal; the positive current is filtered by the filter module, boosted by the boost relay, and then flows into the positive connection terminal.

2. The vehicle-mounted booster according to claim 1, characterized in that: The vehicle-mounted booster also includes a controller, which is used to: The high-voltage relay is disconnected when non-boost charging is performed, and the high-voltage relay and the capacitor relay are closed when boost charging is performed; Changing the working state of the high-voltage relay and the capacitor relay, and determining the working state of the high-voltage relay and the capacitor relay according to the voltage of the high-voltage relay and the capacitor relay; the working state includes the pull-in state and the disconnected state; According to the voltage of the CIN capacitor, the charge of the CIN capacitor and whether it is in a safe state are determined. The safe state means that the capacitor voltage drops below a specified threshold within a specified time.

3. The vehicle-mounted booster according to claim 2, characterized in that: The boost inductor is equipped with an inductor temperature monitoring device; the controller is also used to: determine the temperature of the boost inductor according to the inductor temperature monitoring device, and if the temperature of the boost inductor is not within a safe temperature range, adjust the boost charging power accordingly according to the temperature of the boost inductor.

4. The vehicle-mounted booster according to claim 3, characterized in that: The controller is provided with a high-voltage sampling connector and a low-voltage control connector; the high-voltage sampling connector collects the filtered negative electrode voltage, the CIN capacitor voltage, and the voltage at the output end of the high-voltage relay through a high-voltage sampling circuit; the low-voltage control connector obtains the temperature of the inductor temperature monitoring device through a sampling control circuit, and changes the working states of the high-voltage relay and the capacitor relay.

5. The vehicle-mounted booster according to claim 1, characterized in that: The filter module includes a differential common mode integrated magnetic ring, an X capacitor and a Y capacitor connected in parallel between the positive and negative electrodes.

6. The vehicle-mounted booster according to claim 1, characterized in that: The vehicle-mounted booster also includes a heat dissipation module for dissipating heat for the boost inductor.

7. The vehicle-mounted booster according to claim 6, characterized in that: The heat dissipation module comprises a heat conductive pad arranged at the bottom of the boosted ground sensor, a cooling water channel is arranged in the heat conductive pad, and the cooling water channel is filled with coolant; the cooling water channel is connected to a cooling water nozzle for adding coolant.

8. The vehicle-mounted booster according to any one of claims 1 to 7, characterized in that: The shell of the vehicle-mounted booster is provided with three relatively independent chambers, the boost inductor is located in the first chamber, the controller is located in the second chamber, and the high-voltage relay, capacitor relay and filter module are located in the third chamber; the second chamber is also provided with a controller shielding cover.

9. The vehicle-mounted booster according to any one of claims 1 to 7, characterized in that: The housing of the vehicle-mounted booster includes an upper housing assembly and a lower housing assembly. The waterproof levels of the upper housing assembly and the lower housing assembly are both above IP69. The upper housing assembly and the lower housing assembly are sealed by glue. The housing wall of the lower housing assembly is provided with a waterproof breathable valve. The vehicle-mounted booster also includes an input connector for connecting to a charging pile, a direct-charge output connector for connecting to a battery pack, and a boost output connector for connecting to an electric drive; the input connector and the direct-charge output connector are connected in series via a copper busbar.

10. An automobile, characterized in that: The automobile comprises the vehicle-mounted booster according to any one of claims 1 to 9.

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