Charging device, charging thermal management system, control method and vehicle

Abstract

The invention discloses a charging device, a charging thermal management system, a control method and a vehicle, and the charging device comprises a connector and a first temperature detection device. One end of the connector is used for being electrically connected with the battery pack, and the other end of the connector is provided with a wire harness used for being electrically connected with the charging base. The first temperature detection device is arranged at a position, close to the connector, on the wire harness. In the charging device, the first temperature detection device is arranged on the wire harness outside the connector, if the first temperature detection device fails, the first temperature detection device can be directly dismounted and replaced without dismounting the connector or the battery pack, so that the maintenance of the charging device and the battery pack is facilitated, and the maintenance cost is saved. In addition, the first temperature detection device is arranged at the position, close to the connector, of the wire harness, so that the temperature of the position, close to the connector, with relatively severe temperature rise can be detected, and the charging safety is ensured.

Description

Technical Field

[0001] This application relates to the technical field of charging thermal management, and particularly to a charging device, a charging thermal management system, a control method, and a vehicle. Background Art

[0002] With the rise of the ultra-fast charging liquid-cooled gun technology, the bottleneck point of the temperature rise in the charging circuit is no longer the charging base, but at the position of the battery pack connector. Generally, a temperature sensor is arranged at the copper row position of the battery pack connector, and this temperature sensor is arranged inside the battery pack. However, if the temperature sensor inside the battery pack fails, it is necessary to disassemble the battery pack, which is difficult to repair and has a high maintenance cost. Summary of the Invention

[0003] In view of this, this application provides a charging device, a charging thermal management system, a control method, and a vehicle to solve the problems of high maintenance difficulty and high maintenance cost caused by the existing temperature sensor being arranged inside the battery pack.

[0004] In a first aspect, this application provides a charging device, which includes a connector and a first temperature detection device. One end of the connector is used for electrically connecting with the battery pack, and the other end of the connector is provided with a wire harness for electrically connecting with the charging base. The first temperature detection device is arranged at a position on the wire harness close to the connector.

[0005] In this application, the first temperature detection device is arranged on the wire harness outside the connector. If the first temperature detection device fails, the first temperature detection device can be directly removed and replaced without disassembling the connector or the battery pack, thus facilitating the maintenance of the charging device and the battery pack and saving the maintenance cost.

[0006] In a possible design, the first temperature detection device is connected to the wire harness through a double-wall heat shrink tube. This fixing method is simple and reliable, and it is also convenient to remove for replacing and maintaining the first temperature detection device.

[0007] In a possible design, the connector is provided with terminals, the wire harness includes a core wire and an insulating sheath, one end of the core wire is electrically connected to the terminal, and the other end of the core wire is used for electrically connecting with the charging base. The insulating sheath covers the core wire, and the first temperature detection device is connected to the insulating sheath. The insulating sheath can provide an installation position for the first temperature detection device, making the connection of the first temperature detection device more flexible and convenient for disassembly and assembly.

[0008] In a possible design, at least two first temperature detection devices are provided. The wiring harness includes a first cable and a second cable. At least one of the first temperature detection devices is connected to the first cable, and at least another one of the first temperature detection devices is connected to the second cable. Exemplarily, the terminals of the connector may include a positive terminal and a negative terminal. The positive terminal may correspond to the first cable, and the negative terminal may correspond to the second cable. In some cases, the temperatures of the first cable corresponding to the positive terminal and the second cable corresponding to the negative terminal may be different. For this reason, a first temperature detection device may be provided at a position on the first cable close to the connector, and another first temperature detection device may be provided at a position on the second cable close to the connector. The two first temperature detection devices can respectively detect the temperature at a position on the first cable close to the positive terminal and the temperature at a position on the second cable close to the negative terminal, so as to ensure comprehensive and reliable temperature detection.

[0009] In a possible design, the first temperature detection device is a negative temperature coefficient thermistor.

[0010] In a second aspect, the present application further provides a charging thermal management system, which includes: a connector, a first temperature detection device, and a control unit. One end of the connector is electrically connected to the battery pack, and the other end of the connector is provided with a wiring harness for electrically connecting to a charging seat. The first temperature detection device is disposed at a position on the wiring harness close to the connector. The control unit is signal-connected to the first temperature detection device. The control unit is configured to analyze and process the temperature signal transmitted by the first temperature detection device and control the charging current according to the analyzed temperature signal. Among them, the control unit is an independent unit disposed outside the battery pack and the charging device, and the link between the control unit and the first temperature detection device is also an independent link disposed outside the battery pack and the charging device. Independent signal transmission can be performed between the first temperature detection device and the control unit, which does not occupy the BMS channel in the battery pack and does not require improving the BMS software architecture.

[0011] In a possible design, the control unit includes a Vehicle Information Unit (VIU) and a Vehicle Domain Control (VDC). The vehicle information unit is signal-connected to the first temperature detection device, and the vehicle information unit is configured to analyze and process the temperature signal transmitted by the first temperature detection device. The vehicle central domain control unit is signal-connected to the vehicle information unit; the vehicle information unit is further configured to transmit the analyzed and processed temperature signal to the vehicle central domain control unit, and the vehicle central domain control unit controls the charging current according to the analyzed and processed temperature signal. Among them, the VIU is signal-connected to the first temperature detection device, and the VDC is signal-connected to the VIU. The VIU can analyze and process data through a preset algorithm and then transmit the results to each system internally and to the vehicle owner's terminal. Exemplarily, the VIU can collect the temperature signal transmitted by the first temperature detection device, analyze and process the collected temperature signal, and then send it to the VDC. The VDC can execute measures such as temperature warning and charging current limiting according to the analyzed and processed signal transmitted by the VIU. In this embodiment, the link formed among the first temperature detection device, the VIU, and the VDC is located outside the battery pack and the charging device. The first temperature detection device does not occupy the BMS channel, and there is no need to redesign the layout of the BMS software architecture, which facilitates the setting, wiring layout, and signal control of the first temperature detection device.

[0012] In a possible design, the charging thermal management system further includes a second temperature detection device, which is disposed in the charging seat and is configured to detect the temperature in the charging seat. The second temperature detection device is signal-connected to the control unit. During the charging process, the charging seat is one of the components that cooperate preferentially with external charging power sources such as charging piles, and it is one of the positions where the temperature rise of the charging circuit is the most intense. In order to effectively control the temperature of the charging circuit, it is necessary to fully consider the temperature change in the charging seat. For this reason, in this embodiment, the second temperature detection device can accurately detect the temperature in the charging seat, and since the second temperature detection device can also be connected to the VIU, the charging thermal management system can simultaneously take into account the temperature near the connector in the charging device and the temperature in the charging seat, so as to comprehensively and reliably monitor the temperature of the charging circuit, and can select the most suitable temperature and current control strategy through the VDC to ensure charging safety.

[0013] In a possible design, the charging base includes a first connection terminal and a second connection terminal. There are at least two second temperature detection devices. At least one second temperature detection device is connected to a position inside the charging base near the first connection terminal, and at least one other second temperature detection device is connected to a position inside the charging base near the second connection terminal. Exemplarily, the first connection terminal may be a positive connection terminal, and the second connection terminal may be a negative connection terminal. In some cases, the temperatures near the positive connection terminal and the negative connection terminal may be different. Therefore, in this embodiment, the temperatures near the positive connection terminal and the negative connection terminal can be respectively detected by two second temperature detection devices, so as to ensure comprehensive and reliable temperature detection.

[0014] In a third aspect, the present application further provides a control method. Among them, the charging thermal management system provided in the second aspect of the present application is adopted. The control method includes the following steps:

[0015] Detect the temperature of the wire harness connected to the connector near the connector end, and send a first temperature signal;

[0016] Determine the temperature state of the charging circuit according to the first temperature signal, and send a result signal;

[0017] Execute a charging current control strategy according to the result signal.

[0018] In a possible design, before determining the temperature state of the charging circuit according to the first temperature signal, the control method further includes:

[0019] Detect the temperature inside the charging base, and send a second temperature signal;

[0020] The step of determining the temperature state of the charging circuit according to the first temperature signal and sending a result signal specifically includes:

[0021] Determine the temperature state of the charging circuit according to the first temperature signal and the second temperature signal, and send a result signal.

[0022] In the present application, the link formed among the first temperature detection device, the VIU, and the VDC is located outside the battery pack and the charging device. The first temperature detection device does not occupy the BMS channel, and there is no need to redesign and layout the BMS software architecture, which facilitates the setting, wiring layout, and signal control of the first temperature detection device.

[0023] In a possible design, the first temperature signal includes a first positive temperature signal and a first negative temperature signal. The first positive temperature signal is used to feedback the temperature of the end of the wire harness connected to the positive terminal of the connector, and the first negative temperature signal is used to feedback the temperature of the end of the wire harness connected to the negative terminal of the connector. As described above, in some cases, the temperatures of the first wire corresponding to the positive terminal and the second wire corresponding to the negative terminal may be different. Therefore, a first temperature detection device may be provided at a position on the first wire close to the connector, and another first temperature detection device may be provided at a position on the second wire close to the connector. The two first temperature detection devices can respectively detect the temperature at the position on the first wire close to the positive terminal and the temperature at the position on the second wire close to the negative terminal, so as to ensure comprehensive and reliable temperature detection.

[0024] In a possible design, the second temperature signal includes a second positive temperature signal and a second negative temperature signal. The second positive temperature signal is used to feedback the temperature of the positive terminal connection in the charging seat, and the second negative temperature signal is used to feedback the temperature of the negative terminal connection in the charging seat. As described above, the charging seat may include a first terminal and a second terminal. There are at least two second temperature detection devices. At least one second temperature detection device is connected to a position in the charging seat close to the first terminal, and at least another second temperature detection device is connected to a position in the charging seat close to the second terminal. Exemplarily, the first terminal may be a positive terminal connection, the second terminal may be a negative terminal connection, and partial inner walls in the charging seat close to the positive terminal connection and the negative terminal connection can be used to install the second temperature detection devices. Among them, in some cases, the temperatures near the positive terminal connection and the negative terminal connection may be different. Therefore, by setting at least two second temperature detection devices, the temperature near the positive terminal connection and the temperature near the negative terminal connection can be respectively detected, so as to ensure comprehensive and reliable temperature detection.

[0025] In a possible design, performing a charging current control strategy according to the result signal specifically includes:

[0026] Determine whether the temperature value corresponding to the first temperature signal exceeds a first threshold;

[0027] If so, reduce the actual current value to a target current value according to a preset current reduction strategy.

[0028] In a fourth aspect, the present application further provides a vehicle, which includes a battery pack, a charging seat, and the charging device provided in the first aspect of the present application. One end of the charging device is electrically connected to the battery pack, and the other end of the charging device is electrically connected to the charging seat. Among them, the vehicle including the aforementioned charging device has similar technical effects as the aforementioned charging device, which will not be elaborated here.

[0029] It should be understood that the above general description and the following detailed description are only exemplary and do not limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of this application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Structural schematic diagram of the vehicle provided by the embodiment of this application;

[0032] Figure 2 Schematic diagram when the charging device provided by the embodiment of this application is connected to the battery pack and the charging seat;

[0033] Figure 3 Schematic diagram of the charging thermal management system provided by an embodiment of this application;

[0034] Figure 4 Schematic diagram of the charging thermal management system provided by another embodiment of this application;

[0035] Figure 5 Flowchart of the control method provided by an embodiment of this application;

[0036] Figure 6 Flowchart of the control method provided by another embodiment of this application.

[0037] Reference Signs:

[0038] 100 - Charging device;

[0039] 200 - Battery pack;

[0040] 210 - Socket;

[0041] 300 - Charging seat;

[0042] 400 - Charging power supply;

[0043] 500 - Liquid cooling system;

[0044] 1 - Connector;

[0045] 11 - Terminal;

[0046] 2 - Wiring harness;

[0047] 21 - Core wire;

[0048] 22 - Insulation skin;

[0049] 23 - First cable

[0050] 24 - Second cable

[0051] 3 - First temperature detection device

[0052] 4 - Double - wall heat - shrinkable tube

[0053] 5 - Control unit

[0054] 51 - Vehicle information unit

[0055] 52 - Central vehicle domain control unit

[0056] 6 - Second temperature detection device Detailed implementation manners

[0057] For a better understanding of the technical solutions of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0058] It should be clear that the described embodiments are only part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0059] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. The singular forms "a", "the" and "said" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0060] It should be understood that the term " / and" used herein is only a description of the associated relationship of associated objects, indicating that there can be three relationships. For example, A / and B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0061] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated, the term "plural" means two or more; the terms "connection", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] When an electric vehicle is being charged with direct current, a large amount of heat is generated in the charging circuit, causing the temperature of the charging circuit to rise rapidly. To monitor the temperature of the charging circuit, a temperature sensor is generally set at the position of the connector copper bar on the battery pack. This temperature sensor is arranged inside the battery pack and can send a temperature signal to the vehicle controller. The vehicle controller can execute a preset charging strategy based on the temperature signal to ensure that the temperature of the charging circuit is maintained at a safe level. However, since the temperature sensor is set inside the battery pack, if the temperature sensor fails, the battery pack needs to be returned to the original factory for disassembly, which is difficult to repair and has a high maintenance cost.

[0063] Figure 2 The figure shows a schematic diagram of the charging device provided by the embodiment of the present application when connecting to the battery pack and the charging seat. Refer to Figure 2 , the embodiment of the present application provides a charging device 100. This charging device 100 can be used for electrical connection between the battery pack 200 and the charging seat 300, that is, the battery pack 200 can be connected to the charging seat 300 through this charging device 100. Among them, both the battery pack 200 and the charging seat 300 can be integrated on transportation tools such as electric vehicles and electric motorcycles. The embodiment of the present application does not limit the specific type of transportation tool. In one embodiment, taking Figure 1 the shown transportation tool as a car as an example, the charging seat 300 can be connected to a charging power source 400 such as a charging pile outside the car through a charging cable outside the car to charge the battery pack 200. The battery pack 200 can provide a power source for the transportation tool to ensure the normal operation of various functions on the transportation tool. In one embodiment, the current output by the charging seat 300 can be direct current. In this case, the charging device 100 provided by the embodiment of the present application can be directly connected between the charging seat 300 and the battery pack 200, and the direct current output by the charging seat 300 can be input into the battery pack 200 through this charging device 100. In another embodiment, the current output by the charging seat 300 can be alternating current. In this case, an on-board charger (OBC) can be connected between the charging seat 300 and the charging device 100 provided by the embodiment of the present application. The OBC can convert the alternating current output by the charging seat 300 into direct current, and the direct current can be further input into the battery pack 200 through the charging device 100 provided by the embodiment of the present application.

[0064] Refer to Figure 2, the charging device 100 may include a connector 1. Among them, there can be various types of connectors 1, such as a board-to-board connector 1, a cable / wire-to-cable / wire connector 1, and / or a cable / wire-to-board connector 1, etc. In one embodiment, the connector 1 may include a male head, and the male head includes terminals 11. A female head may be provided on the battery pack 200, and the female head may be a socket 210 with slots on the socket 210. The terminals 11 of the male head can be inserted into the slots of the female head to achieve electrical connection. A wire harness 2 is also provided on the connector 1, and the wire harness 2 may be a high-voltage wire harness 2 for transmitting direct current. One end of the wire harness 2 away from the connector 1 can be electrically connected to the charging base 300.

[0065] Referring to Figure 2 , the charging device 100 may further include a first temperature detection device 3. The first temperature detection device 3 has the function of detecting temperature. In one embodiment, the first temperature detection device 3 may be a negative temperature coefficient thermistor (NTC). The first temperature detection device 3 may be provided on the wire harness 2 of the connector 1 and close to the connector 1. As described above, the position near the connector 1 is the position where the temperature rise is the most severe. If it is considered to set the temperature sensor or the wire of the temperature sensor inside the connector 1, the battery management system (BMS) needs to be used to receive the temperature signal, which will inevitably occupy the BMS channel and affect the BMS software architecture. In addition, since the temperature sensor or the wire of the temperature sensor is set inside the connector 1, if the temperature sensor or the wire of the temperature sensor fails, the connector 1 or even the entire battery pack 200 needs to be disassembled, with high maintenance difficulty and high maintenance cost. Therefore, in this embodiment, the first temperature detection device 3 is set on the wire harness 2 led out of the connector 1, that is, the first temperature detection device 3 has no part set inside the connector 1, and the first temperature detection device 3 is close to the connector 1, so that the temperature at the position where the temperature rise is relatively severe near the connector 1 can be detected, ensuring charging safety. At the same time, since the first temperature detection device 3 is set on the wire harness 2 outside the connector 1, if the first temperature detection device 3 fails, the first temperature detection device 3 can be directly removed and replaced without disassembling the connector 1 or the battery pack 200, thus facilitating the maintenance of the charging device 100 and the battery pack 200 and saving the maintenance cost.

[0066] In one embodiment, Figure 3 is a schematic diagram of a charging thermal management system provided by an embodiment of the present application. Referring to Figure 3, the charging device 100 can be applied to a charging thermal management system, which can achieve the control of the current and temperature in the charging circuit. As described above, if it is considered to arrange the temperature sensor or the wire of the temperature sensor inside the connector 1 or the battery pack 200, the BMS needs to be used to receive the temperature signal, which will inevitably occupy the BMS channel and affect the BMS software architecture. For this reason, the charging thermal management system can include a control unit 5, which is signal-connected to the first temperature detection device 3. The control unit 5 is used to analyze and process the temperature signal transmitted by the first temperature detection device 3 and control the charging current according to the analyzed temperature signal. Among them, "signal connection" means that it can be connected by a signal transmission line or by a wireless signal transmission method, etc. The control unit 5 is an independent unit arranged outside the battery pack 200 and the charging device 100. The link between the control unit 5 and the first temperature detection device 3 is also an independent link arranged outside the battery pack 200 and the charging device 100. Independent signal transmission can be carried out between the first temperature detection device 3 and the control unit 5, which will not occupy the BMS channel in the battery pack 200 and does not require improvement of the BMS software architecture.

[0067] In one embodiment, the control unit 5 can be an integrated unit integrating an information processing module and a vehicle control module. In one embodiment, the control unit 5 can include a vehicle information unit 51 (Vehicle Information Unit, VIU) and a vehicle central domain control unit 52 (Vehicle Domain Control, VDC). Among them, the VIU is signal-connected to the first temperature detection device 3, and the VDC is signal-connected to the VIU. The VIU can analyze and process the data through a preset algorithm and then transmit the results to each system inside and to the owner's terminal. Exemplarily, the VIU can collect the temperature signal transmitted by the first temperature detection device 3, analyze and process the collected temperature signal and then send it to the VDC. The VDC can execute measures such as temperature warning and charging current limiting according to the analyzed signal transmitted by the VIU. Among them, in this embodiment, the link formed by the first temperature detection device 3, the VIU and the VDC is located outside the battery pack 200 and the charging device 100. The first temperature detection device 3 will not occupy the BMS channel, and there is no need to redesign and layout the BMS software architecture, which facilitates the setting, wiring layout and signal control of the first temperature detection device 3.

[0068] In one embodiment, refer to Figure 3, the first temperature detection device 3 is connected to the wire harness 2 through a double-walled heat shrinkable tube 4. Among them, the outer layer of the double-walled heat shrinkable tube 4 can be made of high-quality and soft cross-linked polyolefin material and processed by inner layer hot melt adhesive compounding. The outer layer material of the double-walled heat shrinkable tube 4 has the advantages of insulation, corrosion prevention, wear resistance, etc., and the inner layer has the advantages of low melting point, waterproof, sealing and high adhesiveness, etc. When installing and fixing the first temperature detection device 3, the double-walled heat shrinkable tube 4 can be sleeved on the wire harness 2, and the first temperature detection device 3 can be arranged between the double-walled heat shrinkable tube 4 and the wire harness 2, that is, one side of the first temperature detection device 3 is in contact with the wire harness 2, and the other side is in contact with the inner layer of the double-walled heat shrinkable tube 4. By heating the double-walled heat shrinkable tube 4 to an appropriate temperature, the inner layer melts, and the molten inner side can be combined with the first temperature detection device 3 and the wire harness 2, thereby realizing the reliable connection and fixation of the double-walled heat shrinkable tube 4 with the wire harness 2 and the first temperature detection device 3. This fixing method is simple and reliable, and is also convenient for disassembly to replace and maintain the first temperature detection device 3.

[0069] In one embodiment, in order to improve the waterproof performance of the double-walled heat shrinkable tube and prevent the first temperature detection device 3 from coming into contact with water vapor and failing, a waterproof layer can be provided on the outer surface of the double-walled heat shrinkable tube 4. Exemplarily, the waterproof layer can be an adhesive layer formed by coating glue on the surface of the double-walled heat shrinkable tube, or a waterproof tape wrapped on the surface of the double-walled heat shrinkable tube 4. Of course, in some other embodiments, the waterproof layer can also be other materials or structures with waterproof functions, and this embodiment does not limit this.

[0070] In one embodiment, the first temperature detection device 3 can also be fixed to the wire harness 2 in a manner other than through the double-walled heat shrinkable tube. Exemplarily, the first temperature detection device 3 can be adhesively bonded to the first cable 23 by glue. This adhesive fixing method is convenient for the installation and fixation of the first temperature detection device 3, and is also convenient for the disassembly, replacement and maintenance of the first temperature detection device 3.

[0071] In one embodiment, referring to Figure 3 , the connector 1 is provided with a terminal 11, and this terminal 11 can be used for electrical connection with a socket 210 on the battery pack 200 to facilitate the plugging and unplugging between the charging device 100 and the battery pack 200. The wire harness 2 includes a core wire 21 and an insulating skin 22. The core wire 21 is used for transmitting current. One end of the core wire 21 is electrically connected to the terminal 11, and the other end of the core wire 21 is used for electrical connection with the charging seat 300. Among them, the insulating skin 22 is coated on the core wire 21, and the insulating sheet has an insulating function. The first temperature detection device 3 can be fixedly connected to the insulating skin 22 through the double-walled heat shrinkable tube 4 or glue. Among them, the insulating skin 22 can provide an installation position for the first temperature detection device 3, making the connection of the first temperature detection device 3 more flexible and convenient for disassembly and assembly.

[0072] In one embodiment, referring to Figure 3, at least two first temperature detection devices 3 are provided. The wiring harness 2 includes a first cable 23 and a second cable 24. At least one first temperature detection device 3 is connected to the first cable 23, and at least one other first temperature detection device 3 is connected to the second cable 24. Exemplarily, the terminals of the connector 1 may include a positive terminal and a negative terminal. The positive terminal may correspond to the first cable 23, and the negative terminal may correspond to the second cable 24. In some cases, the temperatures of the first cable 23 corresponding to the positive terminal and the second cable 24 corresponding to the negative terminal may be different. For this reason, a first temperature detection device 3 may be provided at a position on the first cable 23 close to the connector 1, and another first temperature detection device 3 may be provided at a position on the second cable 24 close to the connector 1. The two first temperature detection devices 3 may respectively detect the temperature at the position on the first cable 23 close to the positive terminal and the temperature at the position on the second cable 24 close to the negative terminal, so as to ensure more comprehensive and reliable temperature detection. For example, when the temperatures on the first cable 23 and the second cable 24 collected are different, the relatively larger temperature value may be selected as the basis for current control.

[0073] In one embodiment, referring to Figure 3 , the charging thermal management system further includes a second temperature detection device 6. The second temperature detection device 6 is disposed in the charging base 300 for detecting the temperature in the charging base 300. Figure 4 is a schematic diagram of the charging thermal management system provided by another embodiment of the present application. Referring to Figure 4 , the second temperature detection device 6 may be signal-connected to the vehicle information unit 51 control unit 5. Among them, both the second temperature detection device 6 and the first temperature detection device 3 may be NTC thermistors. During the charging process, the charging base 300 is one of the components that cooperate with external charging power sources such as charging piles preferentially, and is one of the positions where the temperature rise of the charging circuit is the most severe. In order to effectively control the temperature of the charging circuit, it is necessary to fully consider the temperature change in the charging base 300. For this reason, in this embodiment, the second temperature detection device 6 can accurately detect the temperature in the charging base 300, and since the second temperature detection device 6 can also be connected to the VIU, the charging thermal management system can simultaneously take into account the temperature near the connector 1 in the charging device 100 and the temperature in the charging base 300, so as to comprehensively and reliably monitor the temperature of the charging circuit, and can select the most matching temperature and current control strategy through the VDC to ensure charging safety. In addition, in order to reduce the temperature of the charging circuit between the charging base 300 and the external charging power source 400, a liquid cooling system 500 may also be provided between the charging base 300 and the charging power source 400, and this embodiment does not limit this.

[0074] In one embodiment, the charging base 300 may include a first terminal and a second terminal. There are at least two second temperature detection devices 6. At least one second temperature detection device 6 is connected to a position in the charging base 300 near the first terminal, and at least one other second temperature detection device 6 is connected to a position in the charging base 300 near the second terminal. Exemplarily, the first terminal may be a positive terminal, and the second terminal may be a negative terminal. Part of the inner wall of the charging base 300 near the positive terminal and the negative terminal can be used to install the second temperature detection device 6. Specifically, the second temperature sensor can be fixed to the charging base 300 by means such as snap connection and structural rib limitation. The fixing method of the second temperature detection device 6 is not limited in this embodiment. Among them, in some cases, the temperatures near the positive terminal and the negative terminal may be different. Therefore, in this embodiment, the temperatures near the positive terminal and the negative terminal can be detected respectively by the two second temperature detection devices 6, so as to ensure comprehensive and reliable temperature detection. In one embodiment, as described above, at least one first temperature detection device 3 may be provided on the cables corresponding to the positive terminal and the negative terminal of the connector 1 respectively, so that at least one first temperature signal on the cable corresponding to the positive terminal can be collected, and at least one second temperature signal on the cable corresponding to the negative terminal can be collected. In addition, at least one second temperature detection device 6 may be provided at a position in the charging base 300 near the positive terminal and the negative terminal respectively, so that at least one third temperature signal corresponding to the positive terminal can be collected, and at least one fourth temperature signal corresponding to the negative terminal can be collected. The VIU can analyze and process the first temperature signal, the second temperature signal, the third temperature signal and the fourth temperature signal. The VDC can obtain the maximum temperature among the four temperature signals, and select a temperature or current control strategy according to the maximum temperature, so as to reliably and effectively ensure the charging safety.

[0075] Figure 5 It is a flowchart of a control method provided by an embodiment of the present application. Refer to Figure 5 Moreover, an embodiment of the present application also provides a control method, which adopts the charging thermal management system provided by any embodiment of the present application. The control method includes the following steps:

[0076] Step S1: Detect the temperature of the wire harness connected to the connector near the connector end, and send out a first temperature signal. In one embodiment, the temperature of the wire harness near the connector end can be detected by the first temperature detection device installed on the wire harness, and a first temperature signal is sent out.

[0077] Step S2: Determine the temperature state of the charging circuit based on the first temperature signal and send out a result signal. In one embodiment, the VIU can analyze and process the first temperature signal to determine the temperature state of the charging circuit and send out a result signal.

[0078] Step S3: Execute a charging current control strategy based on the result signal. In one embodiment, the VDC can execute a charging current control strategy according to the result signal.

[0079] In one embodiment, step S3 may specifically include:

[0080] Step S31: Determine whether the temperature value corresponding to the first temperature signal exceeds a first threshold. If so, proceed to step S32. Here, the first threshold can be a point value or a range value. In one embodiment, the VDC can determine whether the temperature value corresponding to the first temperature signal exceeds the first threshold.

[0081] Step S32: Reduce the actual current value to a target current value according to a preset current reduction strategy. In one embodiment, the VDC can reduce the actual current value according to the preset current reduction strategy to make the actual current value drop to a safe current level.

[0082] In this embodiment, the link formed among the first temperature detection device, the VIU, and the VDC is located outside the battery pack and the charging device. The first temperature detection device does not occupy the BMS channel, and there is no need to redesign the layout of the BMS software architecture, which facilitates the setting, wiring layout, and signal control of the first temperature detection device.

[0083] In one embodiment, Figure 6 is a flowchart of a control method provided for another embodiment of the present application. Referring to Figure 6 , the control method includes the following steps:

[0084] Step S10: Detect the temperature of the wire harness near the connector end connected to the connector and send out a first temperature signal. In one embodiment, the temperature of the wire harness near the connector end can be detected by a first temperature detection device installed on the wire harness and a first temperature signal is sent out.

[0085] Step S20: Detect the temperature inside the charging socket and send out a second temperature signal. In one embodiment, the temperature inside the charging socket can be detected by a second temperature detection device installed inside the charging socket and a second temperature signal is sent out.

[0086] Step S30: Determine the temperature state of the charging circuit based on the first temperature signal and the second temperature signal, and issue a result signal. In one embodiment, the VIU can analyze and process the first temperature signal to determine the temperature state of the charging circuit and issue a result signal.

[0087] Step S40: Execute the charging current control strategy according to the result signal. In one embodiment, the VDC can execute the charging current control strategy according to the result signal. In one embodiment, the VDC can determine the corresponding charging current control strategy based on the maximum value of the first temperature and the second temperature, thereby reliably and effectively ensuring charging safety.

[0088] In one embodiment, the first temperature signal includes a first positive electrode temperature signal and a first negative electrode temperature signal. As described above, the terminals of the connector can include a positive terminal and a negative terminal, the wire harness can include a first cable corresponding to the positive terminal, and a second cable corresponding to the negative terminal. At least one first temperature detection device is provided on the first cable and the second cable respectively. The first temperature detection device on the first cable can issue a first positive electrode temperature signal, and the first temperature detection device on the second cable can issue a first negative electrode temperature signal. Among them, the first positive electrode temperature signal is used to feedback the temperature of the end of the wire harness connected to the positive electrode of the connector, and the first negative electrode temperature signal is used to feedback the temperature of the end of the wire harness connected to the negative electrode of the connector. In some cases, the temperatures of the first cable corresponding to the positive terminal and the second cable corresponding to the negative terminal may be different. For this reason, one first temperature detection device can be provided at a position close to the connector on the first cable, and another first temperature detection device can be provided at a position close to the connector on the second cable. The two first temperature detection devices can respectively detect the temperature near the positive terminal on the first cable and the temperature near the negative terminal on the second cable, so as to ensure comprehensive and reliable temperature detection.

[0089] In one embodiment, the second temperature signal may include a second positive temperature signal and a second negative temperature signal. The second positive temperature signal is used to feedback the temperature of the positive terminal in the charging base, and the second negative temperature signal is used to feedback the temperature of the negative terminal in the charging base. As described above, the charging base may include a first terminal and a second terminal. There are at least two second temperature detection devices. At least one second temperature detection device is connected to a position in the charging base close to the first terminal, and at least one other second temperature detection device is connected to a position in the charging base close to the second terminal. Exemplarily, the first terminal may be a positive terminal, and the second terminal may be a negative terminal. Part of the inner wall of the charging base close to the positive terminal and the negative terminal can be used to install the second temperature detection device. Among them, in some cases, the temperatures near the positive terminal and the negative terminal may be different. Therefore, by setting at least two second temperature detection devices, the temperatures near the positive terminal and the negative terminal can be detected respectively, so as to ensure comprehensive and reliable temperature detection.

[0090] In one embodiment, the temperature near the connector can be detected by the first temperature detection device, and a first positive temperature signal and a first negative temperature signal are sent out. The temperature in the charging base can be detected by the second temperature detection device, and a second positive temperature signal and a second negative temperature signal are sent out. Among them, the temperature corresponding to the first positive temperature signal is T1, the temperature corresponding to the first negative temperature signal is T2, the temperature corresponding to the second positive temperature signal is T3, and the temperature corresponding to the second negative temperature signal is T4. The VDC can determine the highest temperature among T1, T2, T3, and T4, and determine the corresponding current strategy according to the highest temperature.

[0091] In one embodiment, referring to Figure 3, since the first temperature detection device 3 is connected to the insulating sheath 22 of the wire harness 2, the insulating sheath 22 will cause partial temperature loss, and the temperature detected by the first temperature detection device 3 is lower than the actual temperature of the core wire 21. Therefore, in order to be able to adopt corresponding current control strategies according to the actual temperature of the charging circuit to ensure the safety of charging, it can be considered to compensate the temperature detected by the first temperature detection device 3. Exemplarily, the actual temperature of the core wire 21 can be obtained by measuring under conditions such as controlling the energizing current, the starting ambient temperature, and the charging time, and the temperature detected by the first temperature detection device 3 can be obtained under the same conditions. Thus, the difference between the actual temperature and the temperature detected by the first temperature detection device 3 can be obtained, and the respective corresponding differences obtained under different test conditions can form a compensation value map table. In practical applications, such a compensation value map table can be integrated into the software of the VDC, etc. of vehicles and other means of transportation, and the corresponding compensation value is given according to the temperature detected by the first temperature detection device 3, so that the actual temperature of the charging circuit can be obtained, and the corresponding charging current control strategy can be further adopted according to the actual temperature of the charging circuit, ensuring the charging safety.

[0092] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A charging device, characterized in that, Comprising: A connector, one end of the connector is used for electrically connecting with a battery pack, and the other end of the connector is provided with a wire harness for electrically connecting with a charging seat; A first temperature detection device, arranged at a position on the wire harness close to the connector.

2. The charging device according to claim 1, characterized in that, The first temperature detection device is connected to the wire harness through a double-wall heat shrink tube.

3. The charging device according to claim 1 or 2, characterized in that, The connector is provided with terminals, the wire harness includes a core wire and an insulating sheath, one end of the core wire is electrically connected to the terminal, and the other end of the core wire is used for electrically connecting with the charging seat; The insulating sheath covers the core wire, and the first temperature detection device is connected to the insulating sheath.

4. The charging device according to any one of claims 1 to 3, characterized in that There are at least two first temperature detection devices, the wire harness includes a first cable and a second cable, at least one of the first temperature detection devices is connected to the first cable, and at least one other of the first temperature detection devices is connected to the second cable.

5. The charging device according to any one of claims 1 to 4, characterized in that, The first temperature detection device is a negative temperature coefficient thermistor.

6. A charging thermal management system, characterized in that, Comprising: A connector, one end of the connector is electrically connected to the battery pack, and the other end of the connector is provided with a wire harness for electrically connecting with a charging seat; A first temperature detection device, arranged at a position on the wire harness close to the connector; A control unit, the control unit is signal-connected to the first temperature detection device, and the control unit is used for analyzing and processing the temperature signal transmitted by the first temperature detection device and controlling the charging current according to the analyzed temperature signal.

7. The charging thermal management system according to claim 6, characterized in that, The control unit includes a vehicle information unit and a vehicle central domain control unit; the vehicle information unit is signal-connected to the first temperature detection device, and the vehicle information unit is used for analyzing and processing the temperature signal transmitted by the first temperature detection device; The vehicle central domain control unit is signal-connected to the vehicle information unit; the vehicle information unit is further used for transmitting the analyzed temperature signal to the vehicle central domain control unit, and the vehicle central domain control unit controls the charging current according to the analyzed temperature signal.

8. The charging thermal management system according to claim 6, characterized in that It further includes a second temperature detection device, the second temperature detection device is arranged in the charging seat and is used for detecting the temperature in the charging seat; The second temperature detection device is signal-connected to the control unit.

9. The charging thermal management system according to claim 8, wherein The charging seat includes a first terminal and a second terminal, there are at least two second temperature detection devices, at least one second temperature detection device is connected to a position in the charging seat close to the first terminal, and at least one other second temperature detection device is connected to a position in the charging seat close to the second terminal.

10. A control method, characterized in that, Adopting the charging thermal management system according to any one of claims 6-9, the control method includes the following steps: Detect the temperature at one end of the wire harness connected to the connector close to the connector, and send out a first temperature signal; Determine the temperature state of the charging circuit according to the first temperature signal, and send out a result signal; Execute a charging current control strategy according to the result signal.

11. The control method according to claim 10, characterized in that, Before determining the temperature state of the charging circuit according to the first temperature signal, the control method further includes: Detect the temperature in the charging seat, and send out a second temperature signal; Determine the temperature state of the charging circuit based on the first temperature signal and issue a result signal, specifically including: Determine the temperature state of the charging circuit based on the first temperature signal and the second temperature signal, and issue a result signal.

12. The control method according to claim 10, wherein The first temperature signal includes a first positive temperature signal and a first negative temperature signal. The first positive temperature signal is used to feedback the temperature of the end of the wire harness connected to the positive electrode of the connector, and the first negative temperature signal is used to feedback the temperature of the end of the wire harness connected to the negative electrode of the connector.

13. The control method according to claim 11, wherein The second temperature signal includes a second positive temperature signal and a second negative temperature signal. The second positive temperature signal is used to feedback the temperature of the positive terminal in the charging base, and the second negative temperature signal is used to feedback the temperature of the negative terminal in the charging base.

14. The control method according to claim 10, characterized in that Execute the charging current control strategy according to the result signal, specifically including: Judge whether the temperature value corresponding to the first temperature signal exceeds the first threshold; If so, reduce the actual current value to the target current value according to the preset current reduction strategy.

15. A vehicle, characterized in that, It includes a battery pack, a charging base, and the charging device according to any one of claims 1-6. One end of the charging device is electrically connected to the battery pack, and the other end of the charging device is electrically connected to the charging base.

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