Power supply system, battery pack and vehicle

Abstract

The invention provides a power supply system, a battery pack and a vehicle, and belongs to the technical field of power supply. The power supply system comprises a low-voltage battery, a plurality of high-voltage execution units and a domain control unit. The domain control unit comprises a DCDC converter and a first switching device, the input end of the DCDC converter is electrically connected with the low-voltage battery, the output end of the DCDC converter is electrically connected with the first end of the first switching device, and the second end of the first switching device is electrically connected with the plurality of high-voltage execution units; the DCDC converter is used for converting an output voltage of the low-voltage battery into a target voltage, and the first switching device is used for controlling whether to supply power to the plurality of high-voltage execution units based on the target voltage. By adopting the battery pack, the working stability of the high-voltage execution unit is improved, and the reliability of the battery pack is further improved.

Description

Technical Field

[0001] This disclosure relates to the field of power supply technology, specifically to a power supply system, a battery pack, and a vehicle. Background Technology

[0002] A battery pack typically includes multiple high-voltage actuators, which are used to collect real-time data from the battery pack to monitor its operating status in real time.

[0003] High-voltage actuators require a power supply system to operate, which typically includes a low-voltage battery to provide low-voltage power.

[0004] However, the output voltage of the low-voltage battery fluctuates greatly and is relatively unstable, which reduces the working stability of the high-voltage actuator and thus reduces the reliability of the battery pack. Summary of the Invention

[0005] This disclosure provides a power supply system, a battery pack, and a vehicle, which can solve the technical problems existing in the related art. The technical solution is as follows: In a first aspect, this disclosure provides a power supply system, which includes a low-voltage battery, multiple high-voltage execution units, and a domain control unit; The domain control unit includes a DC-DC converter and a first switching device. The input terminal of the DC-DC converter is electrically connected to the low-voltage battery, the output terminal of the DC-DC converter is electrically connected to the first terminal of the first switching device, and the second terminal of the first switching device is electrically connected to the plurality of high-voltage execution units. The DC-DC converter is used to convert the output voltage of the low-voltage battery into a target voltage, and the first switching device is used to control whether to supply power to the plurality of high-voltage actuators based on the target voltage.

[0006] In one possible implementation, the domain control unit further includes a pre-charge resistor, the first end of which is electrically connected to the second end of the first switching device, and the second end of which is electrically connected to the plurality of high-voltage actuators.

[0007] In one possible implementation, the first switching device is configured to close when a start command is received and open when a stop command is received.

[0008] In one possible implementation, the first switching device is in a closed state.

[0009] In one possible implementation, some of the multiple high-voltage execution units are in an active state, while another portion of the multiple high-voltage execution units are used to switch to an active state when a first activation signal is received. The high-voltage execution units in the active state are used to collect information. The domain control unit further includes a second switching device, which is electrically connected to the plurality of high-voltage execution units and is used to close when a second activation signal is received, so as to send the first activation signal to the other part of the high-voltage execution units.

[0010] In one possible implementation, the high-voltage execution unit includes a low-voltage side data acquisition chip and a bridging conversion chip; The low-voltage side data acquisition chip is electrically connected to the second terminal of the first switching device and is used to acquire low-voltage side data. The bridging conversion chip is electrically connected to the low-voltage side data acquisition chip and the second terminal of the first switching device, and is used to forward the low-voltage side data sent by the low-voltage side data acquisition chip based on the daisy-chain protocol.

[0011] In one possible implementation, the high-voltage execution unit further includes a high-voltage side data acquisition chip, which is electrically connected to the second terminal of the first switching device for acquiring high-voltage side data.

[0012] In one possible implementation, the high-voltage execution unit further includes a high-voltage isolation circuit, the first terminal of which is electrically connected to the second terminal of the first switching device, and the second terminal of which is electrically connected to the high-voltage side data acquisition chip.

[0013] In a second aspect, this disclosure provides a battery pack that includes a power supply system as described in any of the first aspects.

[0014] Thirdly, this disclosure provides a vehicle that includes a power supply system as described in any of the first aspects or a battery pack as described in any of the second aspects.

[0015] The technical solution provided in this disclosure includes at least the following beneficial effects: This disclosure provides a power supply system in which the output voltage of a low-voltage battery is converted into a more stable target voltage by a DC-DC converter, and the high-voltage actuator is powered by the more stable target voltage, thereby improving the working stability of the high-voltage actuator and thus improving the reliability of the battery pack.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a power supply system shown in an embodiment of this disclosure; Figure 2 This is a schematic diagram of a power supply system according to an embodiment of the present disclosure.

[0019] Legend 1. Low-voltage battery; 2. High-voltage actuator; 21. Low-voltage side data acquisition chip; 22. Bridging conversion chip; 23. High-voltage side data acquisition chip; 24. High-voltage isolation circuit; 3. Domain Controller Unit; 31. DC-DC converter; 32. First switching device; 33. Pre-charge resistor; 34. Second switching device. Detailed Implementation

[0020] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0021] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0022] This disclosure provides a power supply system, see [link to relevant documentation] Figure 1The power supply system includes a low-voltage battery 1, multiple high-voltage actuators 2, and a domain control unit 3. The domain control unit 3 includes a DC-DC converter 31 and a first switching device 32. The input terminal of the DC-DC converter 31 is electrically connected to the low-voltage battery 1, the output terminal of the DC-DC converter 31 is electrically connected to the first terminal of the first switching device 32, and the second terminal of the first switching device 32 is electrically connected to each of the multiple high-voltage actuators 2. The DC-DC converter 31 is used to convert the output voltage of the low-voltage battery 1 into a target voltage, and the first switching device 32 is used to control whether to supply power to the multiple high-voltage actuators 2 based on the target voltage.

[0023] The low-voltage battery 1 is used to power the high-voltage execution unit 2 and the domain control unit 3 to ensure their normal operation.

[0024] In this embodiment, the low-voltage battery 1 can provide an output voltage of 9-16V. Of course, the range of its output voltage can also be any other reasonable parameter, which can be selected according to actual needs. This embodiment does not limit this.

[0025] The power supply system may also include multiple high-voltage actuators 2, which can be used to collect various status data of the battery pack, such as the voltage, current, temperature, etc. of the cells in the battery pack.

[0026] Domain control unit 3 is electrically connected to both low-voltage battery 1 and high-voltage execution unit 2. On the one hand, low-voltage battery 1 supplies power to domain control unit 3 and also supplies power to high-voltage execution unit 2 through domain control unit 3. On the other hand, domain control unit 3 can also receive the collected data sent by high-voltage execution unit 2 and determine whether the battery pack is working properly based on the collected data. If it is, it maintains the normal working state; if not, domain control unit 3 can perform corresponding safety control on high-voltage execution unit 2.

[0027] In this embodiment of the disclosure, the domain control unit 3 includes a DC-DC converter 31 and a first switching device 32.

[0028] The input terminal of the DC-DC converter 31 is electrically connected to the low-voltage battery 1, the output terminal of the DC-DC converter 31 is electrically connected to the first terminal of the first switching device 32, and the second terminal of the first switching device 32 is electrically connected to multiple high-voltage execution units 2.

[0029] Since the output voltage of the low-voltage battery 2 fluctuates within a large range, the output voltage of the low-voltage battery 1 is converted into the target voltage by the DC-DC converter 31 to provide stable power supply for the high-voltage actuator 2, thereby improving the working stability of the high-voltage actuator 2 and thus improving the reliability of the battery pack.

[0030] The first switching device 32 is used to control whether to supply power to the multiple high-voltage actuators 2 based on the target voltage. When data acquisition of the battery pack is required, the first switching device 32 can be closed to supply power to the high-voltage actuators 2, ensuring their normal operation. When data acquisition of the battery pack is not required, the first switching device 32 can be opened to de-energize the high-voltage actuators 2 and stop them from acquiring data.

[0031] Therefore, in this power supply system, the output voltage of the low-voltage battery 1 is converted into a more stable target voltage by the DC-DC converter 31, and the high-voltage actuator 2 is powered by the more stable target voltage, thereby improving the working stability of the high-voltage actuator 2 and thus improving the reliability of the battery pack.

[0032] Furthermore, for multiple high-voltage actuators 2, the power supply system of this embodiment only sets up one DC-DC converter 31. The control of multiple high-voltage actuators is realized through this one DC-DC converter 31, which occupies less space, has lower cost, and better electromagnetic compatibility.

[0033] In one possible implementation, the domain control unit 3 further includes a pre-charge resistor 33, the first end of which is electrically connected to the second end of the first switching device 32, and the second end of which is electrically connected to a plurality of high-voltage execution units 2.

[0034] In implementation, a pre-charge resistor 33 is connected after the second terminal of the first switching device 32 to limit the current when the high-voltage system is powered on, preventing the capacitor from charging instantaneously and causing a short circuit that could damage the components. Its working principle is to use the current-limiting characteristics of the resistor to allow the voltage to rise slowly to a stable value, thereby protecting high-voltage components such as contactors and capacitors, and improving control stability and safety.

[0035] In one possible implementation, the first switching device 32 is configured to close when a start command is received and open when a stop command is received.

[0036] In implementation, the first switching device 32 can close upon receiving a start command and open upon receiving a stop command. That is, when data acquisition of the battery pack is required, the first switching device 32 can be closed to supply power to the high-voltage execution unit 2, ensuring its normal operation. When data acquisition of the battery pack is not required, the first switching device 32 can be opened to de-energize the high-voltage execution unit 2, stopping its data acquisition.

[0037] In this way, the circuit is closed when needed and opened when not needed, which reduces power consumption while ensuring normal data acquisition.

[0038] For example, when the power supply system is applied to a vehicle, when the vehicle is powered on, it can send a start command to the domain control unit 3, thereby controlling the first switching device 32 to close and supply power to the high-voltage execution unit 2 to drive the high-voltage execution unit 2 to perform data acquisition. When the vehicle is powered off, it can send a stop command to the domain control unit 3, thereby controlling the first switching device 32 to open and stop supplying power to the high-voltage execution unit 2, thereby stopping the data acquisition and reducing power consumption.

[0039] In another possible implementation, the first switching device 32 is in a closed state.

[0040] In practice, the first switching device 32 can always be in the closed state, that is, the high-voltage execution unit 2 can always collect data to ensure the real-time nature of data collection and improve the supervision of the safety of the battery pack.

[0041] In one possible implementation, some of the high-voltage execution units 2 are in an active state, while another portion of the high-voltage execution units 2 are used to switch to an active state when a first activation signal is received. The high-voltage execution units 2 in the active state are used to collect information.

[0042] See Figure 2 The domain control unit 3 also includes a second switching device 34, which is electrically connected to a plurality of high-voltage actuators 2 and is used to close when a second activation signal is received, so as to send a first activation signal to another part of the high-voltage actuators 2.

[0043] In practice, when the first switching device 32 is always in the closed state, some of the high-voltage execution units 2 can be in the active state, while the other part of the high-voltage execution units 2 is in the inactive state. In this way, the part of the high-voltage execution units 2 in the active state can continuously collect data from the battery pack and monitor the battery pack in real time through the collected data.

[0044] When the data collected by this part of the high-voltage actuator 2 indicates that the battery pack is abnormal, a first activation signal can be sent to another part of the inactive high-voltage actuator 2 to activate all high-voltage actuator 2 and collect data. This will obtain more comprehensive data for more comprehensive safety monitoring of the battery pack. Based on the data collected by all the high-voltage actuator 2, it can be further determined whether the battery pack is abnormal. If so, the battery pack can be safely controlled. If not, it means that the previous judgment was wrong. At this time, the battery pack is not abnormal and can continue to operate normally.

[0045] In this embodiment of the disclosure, the domain control unit 3 further includes a second switching device 34. The second switching device 34 can be used to remain in an open state when the other part of the high-voltage execution unit 2 is not activated. When a second activation signal is received, it indicates that the other part of the high-voltage execution unit 2 needs to be activated at this time. Then, the second switching device 34 can be controlled to close to send a first activation signal to the other part of the high-voltage execution unit 2.

[0046] Once activated, this other high-voltage execution unit 2 can achieve stable power supply through the DC-DC converter 31 and the first switching device 32 to perform comprehensive data acquisition on the battery pack.

[0047] In one possible implementation, the high-voltage execution unit 2 includes a low-voltage side data acquisition chip 21 and a bridging conversion chip 22.

[0048] The low-voltage side data acquisition chip 21 is electrically connected to the second terminal of the first switching device 32 and is used to acquire low-voltage side data.

[0049] In this embodiment, the low-voltage side data acquisition chip 21 can be used to acquire low-voltage side data of the battery pack, such as the temperature of the battery cells in the battery pack, the switching status of the relays in the battery pack, and so on. Of course, it can also acquire any other reasonable low-voltage side data, and this embodiment does not specifically limit the type of data to be acquired.

[0050] The bridging conversion chip 22 is electrically connected to the second terminal of the low-voltage side data acquisition chip 21 and the first switching device 32, and is used to forward the low-voltage side data sent by the low-voltage side data acquisition chip 21 based on the daisy chain protocol.

[0051] In this way, the protocol conversion is realized through the bridging conversion chip 22, which converts the communication protocols of different buses (such as SPI, CAN, etc.) into a unified format, ensuring data communication between the high-voltage execution unit 2 and the domain control unit 3.

[0052] It can also achieve signal isolation and interference immunity, isolating high and low voltage circuits through differential signal transmission (such as the TPL3 protocol), thereby improving communication stability in complex electromagnetic environments.

[0053] Furthermore, it can optimize performance, support daisy-chain topology, simplify internal wiring of the battery pack, and prevent low-speed peripherals from blocking high-speed cores through flow control.

[0054] In one possible implementation, the high-voltage execution unit 2 further includes a high-voltage side data acquisition chip 23, which is electrically connected to the second terminal of the first switching device 32 for acquiring high-voltage side data.

[0055] In this embodiment, the high-voltage side data acquisition chip 23 can be used to acquire high-voltage side data of the battery pack, such as the voltage and current of the cells in the battery pack. Of course, it can also acquire any other reasonable high-voltage side data, and this embodiment does not specifically limit the type of data to be acquired.

[0056] In one possible implementation, the high-voltage execution unit 2 further includes a high-voltage isolation circuit 24, the first end of which is electrically connected to the second end of the first switching device 32, and the second end of which is electrically connected to the high-voltage side data acquisition chip 23.

[0057] In implementation, the high-voltage isolation circuit 24 is placed between the second terminal of the first switching device 32 and the high-voltage side data acquisition chip 23 to separate the high-voltage and low-voltage circuits, ensure personal safety, suppress interference, and realize level conversion.

[0058] Therefore, this disclosure provides a power supply system in which the output voltage of the low-voltage battery 1 is converted into a more stable target voltage by the DC-DC converter 31, and the high-voltage actuator 2 is powered by the more stable target voltage, thereby improving the working stability of the high-voltage actuator 2 and thus improving the reliability of the battery pack.

[0059] This disclosure also provides a control method for a power supply system. The control method is applied to the power supply system described in any of the above claims. The control method includes: controlling a DC-DC converter 31 to convert the output voltage of a low-voltage battery 1 into a target voltage, and controlling the closing or opening of a first switching device 32 to control whether to supply power to a plurality of high-voltage execution units 2 based on the target voltage.

[0060] In practice, since the output voltage of the low-voltage battery 2 fluctuates within a large range, the output voltage of the low-voltage battery 1 is converted into the target voltage by the DC-DC converter 31 to provide stable power supply for the high-voltage actuator 2, thereby improving the working stability of the high-voltage actuator 2 and thus improving the reliability of the battery pack.

[0061] The first switching device 32 is used to control whether to supply power to the multiple high-voltage actuators 2 based on the target voltage. When data acquisition of the battery pack is required, the first switching device 32 can be closed to supply power to the high-voltage actuators 2, ensuring their normal operation. When data acquisition of the battery pack is not required, the first switching device 32 can be opened to de-energize the high-voltage actuators 2 and stop them from acquiring data.

[0062] Therefore, in this power supply system, the output voltage of the low-voltage battery 1 is converted into a more stable target voltage by the DC-DC converter 31, and the high-voltage actuator 2 is powered by the more stable target voltage, thereby improving the working stability of the high-voltage actuator 2 and thus improving the reliability of the battery pack.

[0063] Furthermore, for multiple high-voltage actuators 2, the power supply system of this embodiment only sets up one DC-DC converter 31. The control of multiple high-voltage actuators is realized through this one DC-DC converter 31, which occupies less space, has lower cost, and better electromagnetic compatibility.

[0064] In one possible implementation, the first switching device 32 is controlled to close when a start command is received, and the first switching device 32 is controlled to open when a stop command is received.

[0065] In implementation, the first switching device 32 can close upon receiving a start command and open upon receiving a stop command. That is, when data acquisition of the battery pack is required, the first switching device 32 can be closed to supply power to the high-voltage execution unit 2, ensuring its normal operation. When data acquisition of the battery pack is not required, the first switching device 32 can be opened to de-energize the high-voltage execution unit 2, stopping its data acquisition.

[0066] In this way, the circuit is closed when needed and opened when not needed, which reduces power consumption while ensuring normal data acquisition.

[0067] In another possible implementation, the first switching device 32 is controlled to be in a closed state.

[0068] In practice, the first switching device 32 can always be in the closed state, that is, the high-voltage execution unit 2 can always collect data to ensure the real-time nature of data collection and improve the supervision of the safety of the battery pack.

[0069] In one possible implementation, the second switching device 34 is controlled to be in the off state, so that some of the high-voltage actuators 2 are in the active state and the other part of the high-voltage actuators 2 are in the inactive state.

[0070] When the domain control unit 3 receives the second activation signal, it controls the second switching device 34 to close, so as to send the first activation signal to another part of the high-voltage execution unit 2 and activate the other part of the high-voltage execution unit 2.

[0071] In practice, when the first switching device 32 is always in the closed state, some of the high-voltage execution units 2 can be in the active state, while the other part of the high-voltage execution units 2 is in the inactive state. In this way, the part of the high-voltage execution units 2 in the active state can continuously collect data from the battery pack and monitor the battery pack in real time through the collected data.

[0072] When the data collected by this high-voltage actuator 2 indicates that the battery pack is malfunctioning, a second activation signal can be sent to the domain control unit 3 to control the second switching device 34 to close. This, in turn, sends a first activation signal to another set of inactive high-voltage actuators 2, activating all high-voltage actuators 2 and enabling them to collect data. This provides more comprehensive data for more complete safety monitoring of the battery pack. Based on the data collected by all the high-voltage actuators 2, it is further determined whether the battery pack is malfunctioning. If so, safety control of the battery pack can be implemented. If not, it indicates that the previous judgment was incorrect, and the battery pack is not malfunctioning and can continue to operate normally.

[0073] This disclosure also provides a battery pack that may include a power supply system as described in any of the above embodiments.

[0074] This disclosure also provides a vehicle that may include a power supply system as described above or a battery pack as described above.

[0075] The technical solution provided in this disclosure includes at least the following beneficial effects: This disclosure provides a power supply system in which the output voltage of the low-voltage battery 1 is converted into a more stable target voltage by a DC-DC converter 31, and the high-voltage actuator 2 is powered by the more stable target voltage, thereby improving the working stability of the high-voltage actuator 2 and thus improving the reliability of the battery pack.

[0076] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A power supply system, characterized in that, The power supply system includes a low-voltage battery (1), multiple high-voltage execution units (2) and a domain control unit (3). The domain control unit (3) includes a DC-DC converter (31) and a first switching device (32). The input terminal of the DC-DC converter (31) is electrically connected to the low-voltage battery (1), the output terminal of the DC-DC converter (31) is electrically connected to the first terminal of the first switching device (32), and the second terminal of the first switching device (32) is electrically connected to the plurality of high-voltage execution units (2). The DC-DC converter (31) is used to convert the output voltage of the low-voltage battery (1) into a target voltage, and the first switching device (32) is used to control whether to supply power to the plurality of high-voltage actuators (2) based on the target voltage.

2. The power supply system according to claim 1, characterized in that, The domain control unit (3) further includes a pre-charge resistor (33), the first end of which is electrically connected to the second end of the first switching device (32), and the second end of which is electrically connected to the plurality of high-voltage execution units (2).

3. The power supply system according to claim 1, characterized in that, The first switching device (32) is used to close when a start command is received and to open when a stop command is received.

4. The power supply system according to claim 1, characterized in that, The first switching device (32) is in the closed state.

5. The power supply system according to claim 4, characterized in that, Some of the multiple high-voltage execution units (2) are in an active state, and another part of the multiple high-voltage execution units (2) are used to switch to an active state when a first activation signal is received. The high-voltage execution units (2) in the active state are used to collect information. The domain control unit (3) further includes a second switching device (34), which is electrically connected to the plurality of high-voltage execution units (2) and is used to close when a second activation signal is received, so as to send the first activation signal to the other part of the high-voltage execution units (2).

6. The power supply system according to claim 1, characterized in that, The high-voltage execution unit (2) includes a low-voltage side data acquisition chip (21) and a bridging conversion chip (22). The low-voltage side data acquisition chip (21) is electrically connected to the second terminal of the first switching device (32) for acquiring low-voltage side data; The bridging conversion chip (22) is electrically connected to the second terminal of the low-voltage side data acquisition chip (21) and the first switching device (32), and is used to forward the low-voltage side data sent by the low-voltage side data acquisition chip (21) based on the daisy chain protocol.

7. The power supply system according to claim 1, characterized in that, The high-voltage execution unit (2) also includes a high-voltage side data acquisition chip (23), which is electrically connected to the second terminal of the first switching device (32) and is used to acquire high-voltage side data.

8. The power supply system according to claim 7, characterized in that, The high-voltage execution unit (2) further includes a high-voltage isolation circuit (24), the first end of which is electrically connected to the second end of the first switching device (32), and the second end of which is electrically connected to the high-voltage side data acquisition chip (23).

9. A battery pack, characterized in that, The battery pack includes the power supply system as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, The vehicle includes a power supply system as described in any one of claims 1 to 8 or a battery pack as described in claim 9.

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