Control circuit of battery thermal management unit and new energy electric vehicle

Abstract

The application discloses a battery thermal management unit control circuit and a new energy electric vehicle. The control circuit comprises a pre-charging circuit module connected with a vehicle power supply circuit, used for buffering a vehicle voltage one accessed; a voltage reduction module connected with the pre-charging circuit module, used for reducing the buffered vehicle voltage one, wherein the reduced vehicle voltage one is used for providing power for non-TMS controller circuit components; a TMS controller connected with the voltage reduction module, used for controlling a vehicle battery temperature and controlling the non-TMS controller circuit components to work, wherein the TMS controller is connected with a second vehicle power supply circuit, a vehicle voltage two accessed by the second vehicle power supply circuit is used for providing power for the TMS controller, and a voltage value of the vehicle voltage two is lower than that of the vehicle voltage one.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and more specifically, to a control circuit for a battery thermal management unit and a new energy electric vehicle. Background Technology

[0002] In related technologies, existing pure electric logistics vehicles, heavy trucks, and light trucks generally use external power battery thermal management systems (TMS controllers) for cooling their power batteries. Currently, because the low-voltage 24V load devices of the TMS controller, such as electronic water pumps, fans, and compressors, are all high-power inductive motor devices, these high-power inductive motor devices can easily cause significant interference to the low-voltage 24V, affecting the communication status and normal operation of the TMS controller and the BMS controller.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This invention provides a control circuit for a battery thermal management unit and a new energy electric vehicle, at least solving the technical problem in related technologies where high-power motors and inductive devices can easily cause significant interference to the low-voltage 24V, affecting the normal communication between the TMS controller and the BMS controller.

[0005] According to one aspect of the present invention, a control circuit for a battery thermal management unit is provided, comprising: a pre-charging circuit module connected to a vehicle power supply circuit one, used for buffering a connected vehicle voltage one; a step-down module connected to the pre-charging circuit module, used for stepping down the buffered vehicle voltage one, wherein the step-down vehicle voltage one is used to provide power to non-TMS controller circuit components; and a TMS controller connected to the step-down module, used for controlling the vehicle battery temperature and controlling the operation of the non-TMS controller circuit components, wherein the TMS controller is connected to a vehicle power supply circuit two, and uses a vehicle voltage two connected to the vehicle power supply circuit two to provide power to the TMS controller, wherein the voltage value of the vehicle voltage two is lower than that of the vehicle voltage one.

[0006] Optionally, the pre-charging circuit module includes: a high-voltage pre-charging circuit connected to the vehicle power supply circuit 1, used to buffer the incoming vehicle voltage 1; and a high-voltage filter connected to the high-voltage pre-charging circuit, used to filter out interference signals from the vehicle power supply circuit 1.

[0007] Optionally, the high-voltage pre-charge circuit includes: a high-voltage fuse module connected to the positive terminal of the vehicle power supply circuit one; a positive relay connected to the high-voltage fuse module; a negative relay connected to the negative terminal of the vehicle power supply circuit one; a pre-charge relay connected to the high-voltage fuse module; and a pre-charge resistor connected to the pre-charge relay.

[0008] Optionally, the high-voltage pre-charging circuit further includes a pre-charging capacitor, which is connected to the positive relay, the negative relay, and the pre-charging resistor, respectively.

[0009] Optionally, the high-voltage filter includes: a first capacitor connected in parallel with the pre-charged capacitor; a second capacitor connected in series with the first capacitor; a common-mode inductor connected in parallel with the pre-charged capacitor; a third capacitor connected with the common-mode inductor; and a fourth capacitor connected in series with the third capacitor, wherein the second capacitor and the fourth capacitor are grounded.

[0010] Optionally, the TMS controller is connected to the BMS controller, receives control signals sent by the BMS controller, and communicates with the BMS controller, wherein the control signals include at least one of the following: high voltage signal, battery cooling signal, self-circulation signal, and power-off signal.

[0011] Optionally, the non-TMS controller circuit components include: a compressor connected to the TMS controller, which provides a cooling source for the battery thermal management unit after the TMS controller receives the battery cooling signal; an electronic water pump connected to the TMS controller, which circulates and regulates the antifreeze used during vehicle operation; and a fan connected to the TMS controller, which provides condensing air for the compressor's cooling process.

[0012] Optionally, the compressor is also connected to the pre-charging circuit module and connected to the vehicle voltage.

[0013] Optionally, the non-TMS controller circuit components further include: a wireless module, which provides a wireless control channel for the battery thermal management unit and communicates with the TMS controller through a preset serial port channel, wherein the pre-charging circuit module, the buck module, and the wireless module are integrated.

[0014] According to another aspect of the present invention, a new energy electric vehicle is also provided, including the control circuit of the battery thermal management unit described in any one of the above embodiments.

[0015] In this embodiment of the invention, the low voltage in the battery thermal management unit (which can be understood as the TMS controller system) is provided by two separate power supply lines. Specifically, the vehicle voltage after voltage reduction is used to provide power to non-TMS controller circuit components (including low-voltage high-power loads such as electric water pumps, fans, and wireless modules), and the vehicle voltage connected to the vehicle power supply circuit is used to provide power to the TMS controller. Using two separate power supply lines can greatly reduce this interference, ensure normal communication between the TMS controller and the BMS controller, and thus improve the stability of the TMS controller. This solves the technical problem in related technologies where high-power motors and inductive devices can easily cause significant interference to the low-voltage 24V, affecting the normal communication between the TMS controller and the BMS controller. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the control circuit of an optional battery thermal management unit according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of an optional pre-charging circuit module according to an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] This invention can be applied to various new energy vehicles, including but not limited to logistics vehicles, heavy trucks, and light trucks. These new energy vehicles are powered by power batteries. The cooling of the power battery involved in this invention adopts an external power battery thermal management system (TMS controller). This invention provides a TMS controller control circuit / control system. The control circuit integrates a pre-charging circuit module, a DC-DC module, and a wireless module, which greatly improves the reliability, maintainability, and intelligent control of the product.

[0022] According to one aspect of the present invention, a control circuit for a battery thermal management unit is provided, comprising:

[0023] The pre-charging circuit module is connected to the vehicle power supply circuit 1 and is used to buffer the connected vehicle voltage 1. The vehicle voltage 1 can be understood as high voltage, i.e., a high voltage of 300V-720V. The pre-charging circuit module involved in this embodiment of the invention mainly buffers the high voltage connected to the vehicle power supply circuit 1. For example, when there is a voltage surge or extremely high voltage, the extremely high voltage can be buffered by internal resistors, capacitors and other modules, and then the buffered vehicle voltage 1 is transmitted to the step-down module or compressor.

[0024] The step-down module, connected to the pre-charging circuit module, is used to step down the buffered vehicle voltage. The stepped-down vehicle voltage is used to provide power to non-TMS controller circuit components. This step-down module can convert the 300V-720V high voltage to the 18V-32V low voltage. For example, it can directly convert the 720V high voltage to 24V.

[0025] The TMS controller, connected to the step-down module, is used to control the vehicle battery temperature and control the operation of non-TMS controller circuit components. The TMS controller is connected to the second vehicle power supply circuit, and uses the second vehicle voltage (connected to the second vehicle power supply circuit) to provide power to the TMS controller. The voltage value of the second vehicle voltage is lower than that of the first vehicle voltage. The second vehicle voltage can be immediately at a low voltage, i.e., a low voltage of 18V-32V, such as the conventionally implemented low voltage of 24V in this application.

[0026] TMS (thermal management system) refers to the aforementioned battery thermal management unit, including compressor, fan, and electric water pump; BMS controller (i.e., battery controller) is the controller for the vehicle's battery control system; TMS controller is the controller for the battery thermal management unit.

[0027] Optionally, the TMS controller is powered by the vehicle voltage 2 connected to the vehicle power supply circuit 2. This is because the vehicle's low-voltage 24V battery power supply is stable but provides relatively low power. Therefore, the TMS controller is powered by Vbat24V to control the power consumption.

[0028] After the TMS controller is powered on, it receives a working instruction (the BMS controller is enabled after it is ready, and a high-pressure command and working mode are sent to the TMS controller). Based on this instruction, the TMS controller enters the corresponding working mode and performs the high-pressure operation. The working modes involved in this embodiment include: cooling working mode, self-circulation mode, and shutdown mode. In cooling mode, the compressor, fan, and water pump operate; in self-circulation mode, the water pump operates alone; in shutdown mode, the TMS controller shuts down and enters a low-power mode.

[0029] The control circuit of the aforementioned battery thermal management unit (which can be understood as the TMS controller system) uses two separate power supply lines for the low voltage. One line provides power to non-TMS controller circuit components (including low-voltage high-power loads such as electric water pumps, fans, and wireless modules) via a stepped-down vehicle voltage circuit, while the other line provides power to the TMS controller via a second vehicle voltage circuit. This dual-power supply method significantly reduces interference, ensures normal communication between the TMS controller and the BMS controller, and improves the stability of the TMS controller. This solves the technical problem in related technologies where high-power motors and inductive devices easily cause significant interference to the low-voltage 24V, affecting the normal communication between the TMS controller and the BMS controller.

[0030] Figure 1 This is a schematic diagram of the control circuit of an optional battery thermal management unit according to an embodiment of the present invention, such as... Figure 1 As shown, the control circuit includes: a high-voltage pre-charge module (corresponding to the pre-charge circuit module mentioned above), a DC / DC converter (corresponding to the buck converter mentioned above), a TMS controller (corresponding to the TMS controller mentioned above), a vehicle high-voltage power supply (corresponding to vehicle power supply circuit one mentioned above), a vehicle low-voltage power supply (corresponding to vehicle power supply circuit two mentioned above), an electronic water pump (requiring low voltage 24V), a fan (requiring low voltage 24V), a compressor (high voltage / low voltage), and a wireless module (requiring low voltage 24V). The electronic water pump, fan, and compressor can be understood as components of the non-TMS controller circuit mentioned above. The TMS controller is connected to the BMS controller and receives the battery temperature control signal from the BMS controller to adjust the battery temperature of the new energy vehicle.

[0031] like Figure 1 As shown, the low-voltage power supply of the vehicle has a signal line led out ( Figure 1The enable signal line is drawn from the low-voltage power supply of the vehicle, and the two positive and negative current lines are also included. Figure 1 The 24+ and 24- lines drawn from the low-voltage power supply of the vehicle provide low-voltage power to the TMS controller.

[0032] The low-voltage current after being processed by the DC / DC step-down module powers the electronic water pump, fan, and wireless module, respectively. Figure 2 In the middle, the DC / DC converter, electric water pump, fan, and wireless module are connected to two lines (24+ and 24-), respectively.

[0033] like Figure 1 As shown, the TMS controller controls the electronic water pump, compressor, fan, and wireless module, and establishes communication connections with these four devices respectively (e.g., Figure 1 The CAN-H (high) and CAN-L (low) are connected respectively.

[0034] In the electrical systems of new energy vehicles, there are various high-voltage actuators, such as air conditioning compressors, PTC electric heaters, high-voltage to low-voltage DC-DC converters, and main motor drive systems. These high-voltage components do not have pre-charging capabilities, but this function is indispensable. The control circuits of these high-voltage components contain large energy storage and voltage-stabilizing capacitors. These capacitors generate large currents when high voltage is applied, which can easily damage the internal electronic components, cause relays to stick together and fuses to blow on the high-voltage series circuit, and ultimately affect the normal operation of the entire system.

[0035] Optionally, the pre-charging circuit module includes: a high-voltage pre-charging circuit, connected to the vehicle power supply circuit 1, for buffering the incoming vehicle voltage 1; and a high-voltage filter, connected to the high-voltage pre-charging circuit, for filtering out interference signals from the vehicle power supply circuit 1.

[0036] Alternatively, the high-voltage pre-charge circuit includes: a high-voltage fuse module connected to the positive terminal of the vehicle power supply circuit one; a positive relay connected to the high-voltage fuse module; a negative relay connected to the negative terminal of the vehicle power supply circuit one; a pre-charge relay connected to the high-voltage fuse module; and a pre-charge resistor connected to the pre-charge relay.

[0037] Optionally, the high-voltage pre-charge circuit also includes a pre-charge capacitor, which is connected to the positive relay, the negative relay, and the pre-charge resistor, respectively.

[0038] Optionally, the high-voltage filter includes: a first capacitor connected in parallel with the pre-charged capacitor; a second capacitor connected in series with the first capacitor; a common-mode inductor connected in parallel with the pre-charged capacitor; a third capacitor connected in series with the common-mode inductor; and a fourth capacitor connected in series with the third capacitor, wherein the second and fourth capacitors are grounded.

[0039] One end of the common-mode inductor is connected to the circuit that connects the positive relay and the pre-charge resistor, and the other end is connected to the circuit that connects the negative relay, i.e., it is connected in parallel with the pre-charge capacitor.

[0040] Figure 2 This is a schematic diagram of an optional pre-charging circuit module according to an embodiment of the present invention, such as... Figure 2 As shown, the pre-charging circuit module includes a high-voltage pre-charging circuit and a high-voltage filter. The high-voltage pre-charging circuit includes a high-voltage fuse, a K1 positive main relay, a K2 negative main relay, a K3 pre-charging relay, and a pre-charging resistor R. The high-voltage filter includes an X1 capacitor (corresponding to the first capacitor mentioned above), an X2 capacitor (corresponding to the third capacitor mentioned above), a Y1 capacitor (corresponding to the second capacitor mentioned above), a Y2 capacitor (corresponding to the fourth capacitor mentioned above), and a common-mode inductor. The pre-charging circuit module also includes a pre-charging capacitor C1.

[0041] Both the DC-DC converter and the compressor are pre-charged to high voltage. The high-voltage pre-charge circuit integrates a high-voltage fuse, a K1 positive relay, a K2 negative relay, a K3 pre-charge relay, a pre-charge resistor, and a pre-charge capacitor C1 (large capacitors cannot be accommodated in high-voltage equipment; this acts as a filter to remove low-frequency interference). The high-voltage filter consists of capacitors X1 (for high-frequency interference), X2, Y1, Y2, and a common-mode inductor L. The high-voltage pre-charge circuit prevents large instantaneous currents from flowing through high-voltage components, protecting high-voltage circuit fuses, compressors, and other high-voltage equipment from inrush current damage. The high-voltage filter removes high- and low-frequency interference from the high-voltage circuit, improving the product's EMC (Electronic Performance Compatibility) capability.

[0042] Optionally, the TMS controller is connected to the BMS controller, receives control signals sent by the BMS controller, and communicates with the BMS controller. The control signals include at least one of the following: high voltage signal, battery cooling signal, self-circulation signal, and shutdown signal.

[0043] In this embodiment of the invention, the non-TMS controller circuit components include: a compressor connected to the TMS controller, which provides a cooling source for the battery thermal management unit after the TMS controller receives a battery cooling signal; an electronic water pump connected to the TMS controller, which circulates and regulates the antifreeze used during vehicle operation; and a fan connected to the TMS controller, which provides condensing air for the compressor's cooling process.

[0044] In this embodiment of the invention, the step-down module DC / DC is a high-voltage to low-voltage 24V circuit module that provides 24V load power to the TMS controller system. It provides cooling power to the battery thermal management unit through the compressor and controls the TMS controller to communicate with the BMS controller. After receiving the temperature control signal (e.g., cooling command) sent by the BMS controller, the TMS controller can control the operation of various electronic water pumps, fans, wireless modules, etc. Among them, the electronic water pump provides circulation for antifreeze, the fan provides condensing air for the compressor, and the wireless module provides a wireless control channel for the battery thermal management unit.

[0045] The high-voltage components of the TMS controller, namely the DC-DC converter and the compressor, are connected to the high voltage through the pre-charge circuit module. If the DC-DC converter is not connected to the high voltage through the pre-charge module, the surge current of the DC-DC converter at the moment of high voltage connection will cause the front-end fuse to have a reduced lifespan or blow, or the relay to stick.

[0046] Optionally, the compressor is also connected to the pre-charging circuit module and connected to the vehicle voltage.

[0047] Optionally, the non-TMS controller circuit components also include: a wireless module, which provides a wireless control channel for the battery thermal management unit and communicates with the TMS controller through a preset serial port channel, wherein the pre-charging circuit module, the step-down module and the wireless module are integrated.

[0048] The wireless module communicates with the TMS controller via serial ports RX and TX. It can exchange real-time information with the TMS controller wirelessly and remotely control the controller. The wireless module's remote control function enables remote debugging, remote program upgrades, and remote fault diagnosis, providing strong backend data support for product upgrades, maintenance, and iterations.

[0049] According to another aspect of the present invention, a new energy electric vehicle is also provided, including the control circuit of the battery thermal management unit of any one of the above.

[0050] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0051] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0052] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0053] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0054] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0055] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A control circuit for a battery thermal management unit, characterized in that, The control circuit provides power to the battery thermal management unit via two circuits. The control circuit includes: A pre-charging circuit module, connected to the vehicle power supply circuit 1, is used to buffer the incoming vehicle voltage 1. The pre-charging circuit module includes: a high-voltage pre-charging circuit, connected to the vehicle power supply circuit 1, used to buffer the incoming vehicle voltage 1; and a high-voltage filter, connected to the high-voltage pre-charging circuit, used to filter out interference signals from the vehicle power supply circuit 1. A step-down module, connected to the pre-charging circuit module, is used to step down the buffered vehicle voltage, wherein the stepped-down vehicle voltage is used to provide power to non-TMS controller circuit components, including: a compressor, an electric water pump, and a fan. The TMS controller is connected to the step-down module and is used to control the vehicle battery temperature and control the operation of the non-TMS controller circuit components. The TMS controller is connected to the second vehicle power supply circuit and uses the second vehicle voltage connected to the second vehicle power supply circuit to provide power to the TMS controller. The voltage value of the second vehicle voltage is lower than that of the first vehicle voltage. The non-TMS controller circuit components also include: a wireless module, which provides a wireless control channel for the battery thermal management unit and communicates with the TMS controller through a preset serial port channel, wherein the pre-charging circuit module, the step-down module and the wireless module are integrated; The control circuit also includes a BMS controller. The TMS controller is connected to the BMS controller, receives control signals sent by the BMS controller, and communicates with the BMS controller. The control signals include: high voltage signal, battery cooling signal, self-circulation signal, and power-off signal. When the TMS controller receives the battery temperature control signal from the BMS controller, it adjusts the battery temperature of the new energy vehicle.

2. The control circuit according to claim 1, characterized in that, The high-voltage pre-charging circuit includes: The high-voltage fuse module is connected to the positive terminal of the vehicle power supply circuit one; The positive relay is connected to the high-voltage fuse module; The negative relay is connected to the negative terminal of the vehicle power supply circuit one; A pre-charged relay is connected to the high-voltage fuse module; A pre-charge resistor is connected to the pre-charge relay.

3. The control circuit according to claim 2, characterized in that, The high-voltage pre-charging circuit also includes: The pre-charge capacitor is connected to the positive relay, the negative relay, and the pre-charge resistor, respectively.

4. The control circuit according to claim 3, characterized in that, The high-voltage filter includes: The first capacitor is connected in parallel with the pre-charged capacitor; The second capacitor is connected in series with the first capacitor; A common-mode inductor is connected in parallel with the pre-charge capacitor; The third capacitor is connected to the common-mode inductor; The fourth capacitor is connected in series with the third capacitor. The second capacitor and the fourth capacitor are grounded.

5. The control circuit according to claim 1, characterized in that, The non-TMS controller circuit components include: The compressor is connected to the TMS controller and provides a cooling source for the battery thermal management unit after the TMS controller receives the battery cooling signal. An electronic water pump, connected to the TMS controller, circulates and regulates the antifreeze used during vehicle operation; A fan, connected to the TMS controller, provides condensing air for the compressor's refrigeration process.

6. The control circuit according to claim 5, characterized in that, The compressor is also connected to the pre-charging circuit module and connected to the vehicle voltage.

7. A new energy electric vehicle, characterized in that, It includes the control circuit of the battery thermal management unit as described in any one of claims 1 to 6.

Images