Power supply device and power utilization device

Abstract

The utility model provides a power supply device and a power utilization device. The power supply device comprises a first voltage domain which comprises a power battery pack, a plurality of first sampling units, a second sampling unit and a power conversion module. The power battery pack comprises a plurality of electrically connected single batteries; each first sampling unit comprises a battery sampling circuit, and the plurality of battery sampling circuits are respectively connected with the plurality of battery monomers and are used for collecting electrical parameters of the plurality of battery monomers; the second sampling unit is at least used for collecting electrical parameters of the power battery pack; the power conversion module is connected with the power battery pack, the battery sampling circuit and the second sampling unit, and the power conversion module is used for providing electric energy provided by the power battery pack for the battery sampling circuit and the second sampling unit. Through the design, the first sampling unit and the second sampling unit take electricity from the power battery pack, coupling channels between voltage domains of different voltage levels are reduced, and the reliability of the power supply device is improved.

Description

Technical Field

[0001] The present application relates to the field of power management technology, and in particular to a power supply device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important part of the sustainable development of the automotive industry. For electric vehicles, battery power technology is a key factor in their development.

[0003] Electric vehicles are powered by batteries, and a battery management system (BMS) ensures safe, stable, and efficient operation of these batteries. A BMS typically includes a first voltage domain and a second voltage domain, each with different voltage levels. For electrical safety, the first and second voltage domains must be electrically isolated.

[0004] Taking the example of a case where the voltage level of the first voltage domain is higher than that of the second voltage domain, in the existing BMS, some devices in the first voltage domain need to draw power from the second voltage domain, thereby increasing the coupling channel between the first voltage domain and the second voltage domain, affecting system reliability. Utility Model Content

[0005] To solve the above problems, the present application provides a power supply device and an electrical device. The power supply device solves the problem in the BMS that some devices in the first voltage domain need to draw power from the second voltage domain, thereby increasing the coupling channel between the first voltage domain and the second voltage domain.

[0006] In a first aspect, the present application provides a power supply device, comprising:

[0007] A power battery pack, comprising a plurality of electrically connected battery cells;

[0008] a plurality of first sampling units, each of which comprises a battery sampling circuit, the plurality of battery sampling circuits being respectively connected to the plurality of battery cells for collecting electrical parameters of the plurality of battery cells;

[0009] a second sampling unit, at least for collecting electrical parameters of the power battery pack;

[0010] A power conversion module is connected to the power battery pack, the battery sampling circuit, and the second sampling unit. The power conversion module is used to provide the electric energy provided by the power battery pack to the battery sampling circuit and the second sampling unit.

[0011] Specifically, in the technical solution provided in the embodiment of the present application, by designing a power conversion module, the power conversion module uses the electric energy provided by the power battery pack to power the battery sampling circuit and the second sampling unit, thereby reducing the coupling channel between voltage domains of different voltage levels, improving battery compatibility (EMC) issues, and improving the reliability of the power supply device.

[0012] In some embodiments, the power conversion module is disposed in the first sampling unit.

[0013] Specifically, the power conversion module is disposed in the first sampling unit, and serves as a built-in power supply module of the first sampling unit, thereby simplifying the circuit structure.

[0014] In some embodiments, the power conversion module is electrically connected to the battery cell directly connected to the negative electrode in the power battery pack.

[0015] Specifically, a power conversion module is electrically connected to a battery cell directly connected to the negative electrode, so that the negative electrode of the power conversion module, the negative electrode of the first sampling unit, the negative electrode of the second sampling unit and the negative electrode of the power battery pack are at the same potential, thereby improving current imbalance and equipment damage caused by potential difference.

[0016] In some embodiments, the power battery pack includes multiple battery cell groups, each of which includes multiple battery cells; one battery sampling circuit is connected to multiple battery cells in one battery cell group to collect electrical parameters of multiple battery cells in one battery cell group;

[0017] The power conversion module is electrically connected to the battery cell group directly connected to the negative electrode among the plurality of battery cell groups.

[0018] Specifically, since the supply voltage of the power conversion module is mainly determined by the number of connected battery cells, a power conversion module is designed to connect a battery cell group including multiple battery cells, so as to increase the supply voltage to the power conversion module, thereby reducing power loss when powering the battery sampling circuit and the second sampling unit, and thus reducing the impact on the power consumption balance between the power-consuming battery cell group and other battery cell groups.

[0019] In some embodiments, the power supply device further comprises a controller;

[0020] The second sampling unit and the plurality of first sampling units communicate with the controller through an isolation module.

[0021] Specifically, the isolation module can effectively solve the signal transmission problem between voltage domains of different voltage levels, ensuring the safe, reliable and efficient operation of the system.

[0022] In some embodiments, a plurality of the first sampling units communicate serially to form a communication link, and the first sampling unit at at least one end of the communication link communicates with the controller through one of the isolation modules;

[0023] And the second sampling unit communicates with the controller through one of the isolation modules.

[0024] Specifically, designing a plurality of first sampling units to communicate serially to form a communication link can simplify wiring complexity and reduce costs.

[0025] In some embodiments, the second sampling unit communicates serially with a plurality of the first sampling units to form a communication link; and the second sampling unit or the first sampling unit at at least one end of the communication link communicates with the controller through one of the isolation modules.

[0026] Specifically, the embodiment of the present application designs a serial communication between the second sampling unit and the plurality of first sampling units to form a shared communication link, thereby simplifying the communication network and improving the reliability of data transmission.

[0027] In some embodiments, the isolation module comprises a passive isolation module.

[0028] Specifically, using a passive isolation module as the isolation module can reduce the cost and power consumption of the device.

[0029] In some embodiments, the power supply device also includes a controller, and the controller includes a first wireless communication module; at least one of the first sampling units includes a second wireless communication module; the second sampling unit includes a third wireless communication module, and the second wireless communication module and the third wireless communication module are used to communicate with the first wireless communication module.

[0030] Specifically, this design enables wireless communication between the controller and the first sampling unit and the second sampling unit, and communication signal transmission between the first voltage domain and the second voltage domain can be achieved without an isolation module, further reducing the coupling channel between the first voltage domain and the second voltage domain.

[0031] In a second aspect, the present application provides an electrical device, which includes the power supply device described in any one of the above items. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0033] Figure 1 A schematic diagram of the structure of an electric vehicle provided in some embodiments of the present application;

[0034] Figure 2 A schematic structural diagram of a first voltage domain in a power supply device provided in some embodiments of the present application;

[0035] Figure 3 A schematic diagram of the structure of a power supply device provided in some other embodiments of the present application;

[0036] Figure 4 A schematic structural diagram of a power supply device provided in some other embodiments of the present application;

[0037] Figure 5 A schematic structural diagram of a power supply device provided in some other embodiments of the present application;

[0038] Figure 6 This is a schematic structural diagram of a power supply device provided in some further embodiments of the present application.

[0039] Description of labels:

[0040] Electric vehicle-1000; motor-200; power supply unit-100;

[0041] Power battery pack 10; battery cell pack 11; battery cell 101; first sampling unit 20; battery sampling circuit 21; second wireless communication module 22; second sampling unit 30; third wireless communication module 31; power conversion module 40; controller 50; first wireless communication module 51; isolation module 60; low-voltage power supply 70. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] The terms "first", "second", "third", etc. in the present application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0044] In this document, reference to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the embodiments described herein can be combined with each other in their various aspects.

[0045] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this document generally represents an "or" relationship between the front and rear associated objects.

[0046] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0047] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] Specifically, energy saving and emission reduction is the key to the sustainable development of the automobile industry, and electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. In the embodiments of the present application, the power utilization device takes an electric vehicle as an example.

[0049] Among them, the electric vehicle refers to a vehicle that uses an on-board power source as power and uses a motor to drive the wheels to travel, and meets the requirements of road traffic and safety regulations. Its prospect is widely optimistic due to its relatively small impact on the environment compared to traditional fuel vehicles. Among them, the types of electric vehicles include pure electric vehicles, hybrid vehicles including vehicles powered by on-board power sources, etc.

[0050] Among them, the on-board power source can be arranged at the bottom or the head or the tail of the electric vehicle. The on-board power source can be used to power the electric vehicle, wherein the existing on-board power source generally includes a power battery pack. The power battery pack can include a plurality of battery monomers, which can be connected in series, parallel or mixed. Mixed connection means that there are both series and parallel connections among the plurality of battery monomers. The plurality of battery monomers can be directly connected in series, parallel or mixed together, and then the whole formed by the plurality of battery monomers is accommodated in a box to form an on-board power source; of course, the battery monomer can also be in the form of a battery module composed of a plurality of battery monomers connected in series, parallel or mixed, and a plurality of battery modules connected in series, parallel or mixed to form a whole and accommodated in a box. Each battery monomer can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0051] Among them, the on-board power source generally includes a battery management system (Battery Management System, BMS), which is an important link between the power battery pack and the whole vehicle, responsible for monitoring the state of the power battery pack and the plurality of battery monomers in the power battery pack, and providing necessary information for the whole vehicle control and safety. Therefore, the design of the power supply device containing the BMS is directly related to the safe driving of the automobile and the safety of the driver and passenger.

[0052] Specifically, the power supply device includes a BMS, and the BMS includes a first voltage domain and a second voltage domain of different voltage levels. Taking the voltage level of the first voltage domain higher than that of the second voltage domain as an example, the first voltage domain generally includes a power battery pack, a first sampling unit for collecting electrical parameters of a plurality of battery monomers in the power battery pack, and at least a second sampling unit for collecting electrical parameters of the power battery pack. The first sampling unit can be understood as a battery sampling unit, and the second sampling unit can be understood as a high-voltage sampling unit. In the current mainstream scheme, the first sampling unit is powered by the power battery pack in the first voltage domain, and the second sampling unit needs to take power from the second voltage domain through an isolation power supply device.

[0053] However, the presence of the isolated power supply device creates a coupling channel between the first voltage domain and the second voltage domain, affecting system reliability and also causing issues such as battery compatibility (EMC).

[0054] To alleviate the above-mentioned problems, the present application provides a power supply device, comprising a power battery pack, a plurality of first sampling units, a second sampling unit, and a power conversion module. The power battery pack comprises a plurality of electrically connected battery cells; each first sampling unit comprises a battery sampling circuit, wherein the plurality of battery sampling circuits are respectively connected to the plurality of battery cells and are configured to collect electrical parameters of the plurality of battery cells; the second sampling unit is configured to collect at least the electrical parameters of the power battery pack; and the power conversion module is connected to the power battery pack, the battery sampling circuit, and the second sampling unit. The power conversion module is configured to provide electrical energy provided by the power battery pack to the battery sampling circuit and the second sampling unit.

[0055] Specifically, in the technical solution provided in the embodiment of the present application, by designing a power conversion module, the power conversion module uses the electric energy provided by the power battery pack to power the battery sampling circuit and the second sampling unit, thereby eliminating the need to draw power from the second voltage domain, reducing the coupling channel between voltage domains of different voltage levels (such as the first voltage domain and the second voltage domain mentioned above), improving battery compatibility (EMC) issues, and improving the reliability of the power supply device.

[0056] The power supply device disclosed in the embodiments of the present application can be used in power-consuming devices that use power battery packs as power sources or various energy storage systems that use power battery packs as energy storage elements. Power-consuming devices can include, but are not limited to, electric vehicles, electric vehicles, ships, spacecraft, and the like. Spacecraft can include, for example, aircraft, rockets, space shuttles, and spacecraft.

[0057] For the convenience of description, the following embodiments are described by taking an electric vehicle as an example of an electric device in one embodiment of the present application.

[0058] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of an electric vehicle provided for some embodiments of the present application. The electric vehicle 1000 may be a pure electric vehicle, a hybrid electric vehicle, an extended-range vehicle, or the like. A power supply device 100 is provided inside the electric vehicle 1000, and the power supply device 100 may be provided at the bottom, head, or tail of the electric vehicle 1000. The power supply device 100 may be used to supply power to the electric vehicle 1000. For example, the power supply device 100 may serve as an operating power source or a driving power source for the electric vehicle 1000. For example, it is used to meet the power requirements of the electric vehicle 1000 for starting, navigation, entertainment, comfort adjustment, and operation during driving. The electric vehicle 1000 may further include a motor 200, and the power supply device 100 is used to supply power to the motor 200, thereby utilizing the motor 200 to drive the electric vehicle 1000 to travel.

[0059] See also Figure 2 , Figure 2 A schematic structural diagram of the first voltage domain in a power supply device provided in some embodiments of the present application.

[0060] In some embodiments, a power supply device 100 includes a power battery pack 10, multiple first sampling units 20, a second sampling unit 30, and a power conversion module 40. The power battery pack 10 includes multiple electrically connected battery cells 101; each first sampling unit 20 includes a battery sampling circuit 21, each of which is connected to the multiple battery cells 101 and configured to collect electrical parameters of the multiple battery cells 101; the second sampling unit 30 is configured to collect at least the electrical parameters of the power battery pack 10; and the power conversion module 40 is connected to the power battery pack 10, the battery sampling circuit 21, and the second sampling unit 30. The power conversion module 40 is configured to provide electrical energy provided by the power battery pack to the battery sampling circuit 21 and the second sampling unit 30.

[0061] The power battery pack 10, the plurality of first sampling units 20, the second sampling unit 30, and the power conversion module 40 may be arranged in the aforementioned first voltage domain. The first voltage domain refers to the portion of the power supply device 100 that processes high-voltage electrical energy, typically involving charge and discharge management, high-voltage sensors, and protection circuits of the power battery pack 10. The voltage of the first voltage domain typically ranges from hundreds of volts to thousands of volts, depending on the configuration and application of the power battery pack 10. The second voltage domain refers to the portion of the power supply device 100 that processes low-voltage signals and controls, typically involving sensors, controllers, communication interfaces, and low-voltage power supplies. The voltage of the second voltage domain typically ranges from a few volts to tens of volts, depending on the design and application of the system.

[0062] In the power battery pack 10, multiple battery cells 101 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection means that multiple battery cells 101 are connected both in series and in parallel. Multiple battery cells 101 can be directly connected in series, in parallel, or in a hybrid connection, and then the entirety of the multiple battery cells 101 is housed in a box. Of course, the power battery pack 10 can also be in the form of a battery module in which multiple battery cells 101 are first connected in series, in parallel, or in a hybrid connection, and then the multiple battery modules are further connected in series, in parallel, or in a hybrid connection to form an entirety and housed in a box. The power battery pack 10 may also include other structures. For example, the power battery pack 10 may also include a busbar component for achieving electrical connection between the multiple battery cells 101.

[0063] Each battery cell 101 can be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 101 can be cylindrical, flat, rectangular, or in other shapes.

[0064] The first sampling unit 20 (Cell Supervision Circuit, CSC) is a part of the BMS and is responsible for real-time monitoring and collecting data of each battery cell 101 in the power battery pack 10, including electrical parameters such as voltage and temperature.

[0065] The second sampling unit 30 (High Voltage Board, HVB) is part of the BMS and is responsible for real-time monitoring and collecting data of the high voltage part of the power battery pack 10, including electrical parameters such as total voltage, total current, and insulation detection.

[0066] The power conversion module 40 is an electronic device used to convert one form of electrical energy into another. In the embodiment of the present application, the power conversion module 40 includes a DC-DC switching power supply. Specifically, the DC-DC switching power supply can handle a wide range of input voltages, thereby facilitating the processing of the voltage input from the power battery pack 10 into a voltage range that can be used by the battery sampling circuit 21 and the second sampling unit 30. Furthermore, the DC-DC switching power supply has a higher conversion efficiency, thereby reducing energy loss to the power battery pack 10.

[0067] Specifically, in the technical solution provided in the embodiment of the present application, by designing the power conversion module 40, the power conversion module 40 uses the power provided by the power battery pack 10 to power the battery sampling circuit 21 and the second sampling unit 30, thereby eliminating the need to draw power from the second voltage domain, reducing the coupling channel between voltage domains of different voltage levels, improving battery compatibility (EMC) issues, and improving the reliability of the power supply device 100.

[0068] See also Figure 3 , Figure 3 The structure schematic diagram of the power supply device provided for some embodiments of the present application; in some embodiments, the power conversion module 40 is arranged in the first sampling unit 20.

[0069] Specifically, the power conversion module 40 is arranged in the first sampling unit 20, and the power conversion module 40 serves as the built-in power module of the first sampling unit 20, thereby simplifying the circuit structure.

[0070] It should be noted that the power conversion module 40 can be used as the built-in power module in each of the plurality of first sampling units 20; or the number of the first sampling units 20 using the power conversion module 40 as the built-in power module can be one, which is used to supply power to the second sampling unit 30, and the other first sampling units 20 can have the same structure and function as the existing first sampling units. For example, the other first sampling units 20 can be built-in linear voltage regulator (LDO), and the power battery pack 10 supplies power to the battery sampling circuit 21 in the first sampling unit 20 through the linear voltage regulator.

[0071] Specifically, the power conversion module 40 (including DC-DC switching power supply) is used to supply power to the second sampling unit 30, which can reduce the power supply loss of the power battery pack 10 compared with the power supply using the conventional LDO (low dropout linear regulator) and the like, thereby reducing the influence on the power consumption uniformity of the power battery pack 10.

[0072] In some embodiments, the conversion efficiency of the power conversion module 40 is greater than or equal to 85%.

[0073] For example, the conversion efficiency of the power conversion module 40 can be 85%, 90%, 95% or even 98%, which is not limited herein.

[0074] The conversion efficiency of the power conversion module 40 is one of the important indicators for measuring the performance of the power conversion module 40. The conversion efficiency refers to the ratio of the output power to the input power, which is usually expressed in percentage. High efficiency means less energy loss and more energy-saving system.

[0075] Please continue to see Figure 3 In some embodiments, the power conversion module 40 is electrically connected with the battery cell 101 directly connected with the negative electrode BAT- in the power battery pack 10.

[0076] With this design, when the power conversion module 40 uses the power provided by the battery cell 101 directly connected to the negative electrode BAT- to power the battery sampling circuit 21 and the second sampling unit 30, the negative electrode of the power conversion module 40, the negative electrode of the first sampling unit 20, the negative electrode of the second sampling unit 30, and the negative electrode BAT- of the power battery pack 10 are at the same potential, eliminating the need for isolation measures and improving current imbalance and equipment damage caused by potential differences.

[0077] Please continue to see Figure 3 In some embodiments, the power battery pack 10 includes multiple battery cell groups 11, each battery cell group 11 includes multiple battery cells 101; a battery sampling circuit 21 is connected to the multiple battery cells 101 in a battery cell group 11 to collect electrical parameters of the multiple battery cells 101 in a battery cell group 11; the power conversion module 40 is electrically connected to the battery cell group 11 directly connected to the negative electrode BAT- among the multiple battery cell groups 11.

[0078] Specifically, the power battery pack 10 has a positive electrode BAT+ and a negative electrode BAT-. In the direction from the positive electrode BAT+ to the negative electrode BAT-, multiple battery cells 101 are divided into multiple battery cell groups 11. The multiple battery cells 101 in the multiple battery cell groups 11 can be connected in series, in parallel, or in mixed series. This embodiment uses series connection as an example. Each first sampling unit 20 is electrically connected to a battery cell group 11 and is used to collect electrical parameters of each battery cell 101 within the battery cell group 11.

[0079] It can be understood that the battery cell group 11 connected to the power conversion module 40 for supplying power to the battery sampling circuit 21 and the second sampling unit 30 includes a battery cell 101 directly connected to the negative electrode BAT-, thereby realizing the above-mentioned equipotential principle.

[0080] Since the supply voltage of the power conversion module 40 is mainly determined by the number of connected battery cells 101, the power conversion module 40 is designed to be connected to multiple battery cells 101. This can increase the supply voltage to the power conversion module 40, thereby reducing the power loss of the power-consuming battery group (the battery cell group 11 connected to the power conversion module 40) when powering the battery sampling circuit 21 and the second sampling unit 30, thereby reducing the impact on the power consumption balance between the power-consuming battery cell group and other battery cell groups 11.

[0081] In addition, if Figure 3 The labels PACK+ and PACK- in the figure can be used as output ports of the power battery pack 10 for electrically connecting to electrical equipment such as the motor 200.

[0082] See also Figure 3-Figure 5 , Figure 4A schematic structural diagram of a power supply device provided in some other embodiments of the present application; Figure 5 This is a schematic structural diagram of a power supply device provided in some other embodiments of the present application.

[0083] In some embodiments, the power supply device 100 further includes a controller 50 ; the second sampling unit 30 and the plurality of first sampling units 20 communicate with the controller 50 via the isolation module 60 .

[0084] The controller 50 (BCU) is located in the second voltage domain and is the core control unit of the BMS, responsible for coordinating and managing the operation of the entire system. Its main functions include, but are not limited to, data acquisition, data processing, control algorithms, and communication management.

[0085] The second voltage domain further includes a low-voltage power supply 70 for supplying power to various devices in the second voltage domain. The low-voltage power supply 70 may be a 12V / 24V power supply.

[0086] The isolation module 60 is an electronic component used to transmit signals between the first voltage domain and the second voltage domain. It ensures that the voltage on the high-voltage side is not transmitted to the low-voltage side through physical isolation, thereby achieving electrical isolation.

[0087] Specifically, the isolation module 60 can effectively solve the signal transmission problem between voltage domains of different voltage levels, ensuring the safe, reliable and efficient operation of the system.

[0088] The isolation module 60 may include a passive isolation module or an active isolation module. In some embodiments of the present application, the isolation module 60 includes a passive isolation module, wherein the passive isolation module includes but is not limited to a transformer module and a capacitor module. The passive isolation module does not require an external power supply and relies on its own physical properties to achieve isolation.

[0089] The transformer module generally includes a primary side and a secondary side. The primary and secondary sides are respectively arranged in the first and second voltage domains. The transformer utilizes the magnetic coupling principle to achieve electrical isolation and signal transmission between the first and second voltage domains. Specifically, the signal in the first voltage domain generates a magnetic field through the primary coil. This magnetic field is transmitted through the iron core to the secondary coil, where it is converted into an electrical signal for transmission.

[0090] The capacitor module utilizes the electric field coupling principle of capacitors to achieve electrical isolation and signal transmission between the first and second voltage domains. The signal in the first voltage domain is coupled to the other side through a capacitor. The signal is then coupled back through another capacitor and converted into an electrical signal.

[0091] Specifically, compared to using an active isolation module as the isolation module 60 , the embodiment of the present application uses a passive isolation module as the isolation module 60 , which can reduce the cost and power consumption of the device.

[0092] See also Figure 3 In some embodiments, the communication networks of the plurality of first sampling units 20 communicate serially to form a communication link (represented by a dotted arrow), and the first sampling unit 20 at at least one end of the communication link communicates with the controller 50 via an isolation module 60; and the second sampling unit 30 communicates with the controller 50 via an isolation module 60.

[0093] Among them, the communication link refers to a network link used to transmit signals. In the embodiment of the present application, the communication link refers to the network link used by the second sampling unit 30 and the first sampling unit 20 to transmit the collected data of each battery cell 101 in the power battery pack 10, the data of the high-voltage part of the power battery pack 10, etc.

[0094] The communication networks of the multiple first sampling units 20 communicate serially to form a communication link, thereby forming a daisy chain. The signals or data of the multiple first sampling units 20 are transmitted in sequence along the daisy chain and finally communicate with the controller 50 through the isolation module 60.

[0095] Specifically, the communication network of the plurality of first sampling units 20 is designed to communicate serially to form a daisy chain communication connection structure. The connection method is simple and easy to expand. Compared with a star connection or other complex connection methods, the daisy chain can reduce wiring complexity and cost.

[0096] See also Figure 4 In some embodiments, the second sampling unit 30 communicates serially with the communication network of the plurality of first sampling units 20 to form a communication link; and the second sampling unit 30 or the first sampling unit 20 at at least one end of the communication link communicates with the controller 50 through an isolation module 60 .

[0097] Specifically, in the embodiment of the present application, the chip in the second sampling unit 30 and the chips in the multiple first sampling units 20 use the same communication protocol. The chip in the second sampling unit 30 and the chips in the multiple first sampling units 20 can share a communication link, thereby simplifying the layout of the communication network and improving the reliability of data transmission.

[0098] like Figure 4 As shown, the second sampling unit 30 communicates serially with the communication network of the plurality of first sampling units 20 to form a communication link, and the second sampling unit 30 at the end of the communication link communicates with the controller 50 through an isolation module 60 .

[0099] like Figure 5 As shown, the second sampling unit 30 communicates serially with the communication network of multiple first sampling units 20 to form a communication link; and the first sampling unit 20 at the head end of the communication link communicates with the controller 50 through an isolation module 60, and the second sampling unit 30 at the end of the communication link communicates with the controller 50 through an isolation module 60.

[0100] Specifically, through the above design, the second sampling unit 30 and the multiple first sampling units 20 communicate serially to form a communication link, and form a ring-shaped communication network. In this way, when there is a breakpoint in the ring-shaped communication link, the signals located above and below the breakpoint can also be communicated and transmitted respectively, thereby improving the reliability of data transmission.

[0101] See also Figure 6 , Figure 6 A structural schematic diagram of a power supply device is provided for some other embodiments of the present application. In some embodiments, the power supply device also includes a controller 50, and the controller 50 includes a first wireless communication module 51; at least one first sampling unit 20 includes a second wireless communication module 22; the second sampling unit 30 includes a third wireless communication module 31, and the second wireless communication module 22 and the third wireless communication module 31 are used to communicate with the first wireless communication module 51.

[0102] The controller 50 may be set in a second voltage domain having a lower voltage level than the first voltage domain.

[0103] The wireless communication module is an electronic component used to implement wireless data transmission between devices. In the embodiment of the present application, the wireless communication module is used to transmit the electrical parameters collected by the second sampling unit 30 and the battery sampling circuit 21 in the first sampling unit 20. The wireless communication module includes but is not limited to a Bluetooth module, a Wi-Fi (Wireless Fidelity) module, a Zigbee module, etc.

[0104] Specifically, this design enables wireless communication between the controller 50 and the first sampling unit 20 and the second sampling unit 30, and communication signal transmission between voltage domains of different voltage levels can be achieved without the isolation module 60, further reducing the coupling channels between voltage domains of different voltage levels.

[0105] Among them, such as Figure 6 In the illustrated embodiment, the plurality of first sampling units 20 can communicate serially to form a communication link, and the electrical parameters collected by the plurality of first sampling units 20 are transmitted to the controller 50 via a second wireless communication module 22, thereby saving costs.

[0106] The following is a specific implementation of the power supply device 100 of the present application.

[0107] The power supply device 100 includes a first voltage domain and a second voltage domain. The first voltage domain includes a power battery pack 10, multiple first sampling units 20, a second sampling unit 30, and a power conversion module 40. The power battery pack 10 includes multiple electrically connected battery cells 101. Each first sampling unit 20 includes a battery sampling circuit 21. The multiple battery sampling circuits 21 are respectively connected to multiple battery cells 101. The second sampling unit 30 is used to collect at least the electrical parameters of the power battery pack 10. The power conversion module 40 is connected to the power battery pack 10, the battery sampling circuit 21, and the second sampling unit 30. The power conversion module 40 is used to provide electrical energy provided by the power battery pack to the battery sampling circuit 21 and the second sampling unit 30.

[0108] Among them, the first sampling unit 20 uses a new generation of high-string AFE chip, which includes a battery sampling circuit 21 and can collect electrical parameters of 20 or more battery cells 101. Different from the 12-18 string conventional AFE chip, which uses a linear step-down power supply module to provide power, the new generation of AFE chip has an increased supply voltage due to the increase in the number of battery cells 101, and the new generation of AFE chip has a built-in DC-DC power conversion module 40, which can provide external power output.

[0109] The battery cell group 11, electrically connected to the power conversion module 40, provides input voltage to the power conversion module 40 and includes battery cells 101 directly connected to the negative electrode BAT-. This utilizes the principle that the reference grounds of the second sampling unit 30 and the first sampling unit 20 are at the same potential as the negative electrode BAT- of the power battery pack 10. The power output from the core chip (AFE) in the first sampling unit 20, based on BAT-, can be directly supplied to the second sampling unit 30 without requiring isolation measures.

[0110] It should be noted that in the power supply device 100 provided in the embodiment of the present application, the battery cell group 11 corresponding to the power conversion module 40 that supplies power to the second sampling unit 30 has a higher power consumption than other battery cell groups 11 , resulting in uneven power consumption.

[0111] Based on this, the key points that enable the implementation of the embodiments of the present application are:

[0112] The AFE chip in the first sampling unit 20 has a built-in DC-DC power conversion module 40, which can convert the total voltage (approximately 100V to 120V) provided by the battery cell group 11 (≥20 power battery cells connected in series) into a lower voltage (12V / 5V / 3V, etc.) that can be directly used by the second sampling unit 30.

[0113] The conversion efficiency of the DC-DC power conversion module 40 in the AFE chip is ≥85%.

[0114] The operating power consumption of the second sampling unit 30 is no more than 120 mW, and the static power consumption is no more than 50 uA.

[0115] The operating power consumption refers to the power consumed by the second sampling unit 30 during normal operation. This power consumption includes the operating power consumption of various components in the second sampling unit 30, such as the sensor, ADC, microcontroller, communication interface, and other components when performing data acquisition and processing tasks.

[0116] Static power consumption refers to the power consumption when the second sampling unit 30 is not performing any data acquisition and processing tasks. This part of power consumption is mainly caused by leakage current and static current in the circuit.

[0117] Under this condition, the imbalance impact analysis is as follows:

[0118] According to the switching power supply efficiency calculation formula: η=Po / Pi=Po / (Vi*Ii)(1)

[0119] ① For a power supply requirement of 120mW, the current loss at the input is:

[0120] Ii=Vo*Io / Vi*η=120mA / [(100V~120V)*85%]≈0.490mA~0.588mA≈0.6mA(max); (2)

[0121] Wherein, Vo is the rated voltage of the second sampling unit 30, Io is the rated current of the second sampling unit 30, Vo*Io is the operating power consumption of the second sampling unit 30 (which can be 12V*10mA, 5V*24mA, etc.), Vi is the input voltage of the power conversion module 40 (i.e., the output voltage of the power-consuming battery cell group), and η is the conversion efficiency of the power conversion module 40.

[0122] It can be seen from the above formula (2) that when the second sampling unit 30 is in working condition, the current consumption of the power-consuming battery cell group supplying power to the second sampling unit 30 through the power conversion module 40 is approximately 0.6 mA.

[0123] ② Assuming that the system works for 8 hours a day, works for 240 hours a month, and sleeps for 480 hours, the energy consumption of the power battery pack 10 by the second sampling unit 30 is: 144mAh (240h*0.6mA), and the static power consumption is: 4.8mAh (480h*10uA).

[0124] For a conventional power battery pack 10 , the capacity is not less than 100 Ah, resulting in a monthly discharge rate of 148.8 mAh / 100 Ah=0.1488%, which is much smaller than the self-discharge difference of the power battery pack 10 itself of 1% to 3%.

[0125] Therefore, the loss of the power battery pack 10 caused by the power supply of the second sampling unit 30 is almost negligible, or the imbalance effect can be easily eliminated through balancing.

[0126] Furthermore, the communication between the first voltage domain and the second voltage domain adopts a passive isolation method, including but not limited to transformer or capacitor isolation.

[0127] Furthermore, the chip of the second sampling unit 30 and the chip of the first sampling unit 20 are from the same chip supplier, so the second sampling unit 30 and the first sampling unit 20 can be cascaded to share the same communication network, such as Figure 4 As shown; at the same time, a ring communication network can also be formed, such as Figure 5 As shown;

[0128] The above is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power supply device, characterized in that: The power supply device comprises: A power battery pack, comprising a plurality of electrically connected battery cells; a plurality of first sampling units, each of which comprises a battery sampling circuit, the plurality of battery sampling circuits being respectively connected to the plurality of battery cells for collecting electrical parameters of the plurality of battery cells; a second sampling unit, at least for collecting electrical parameters of the power battery pack; A power conversion module is connected to the power battery pack, the battery sampling circuit, and the second sampling unit. The power conversion module is used to provide the electric energy provided by the power battery pack to the battery sampling circuit and the second sampling unit.

2. The power supply device according to claim 1, wherein: The power conversion module is disposed in the first sampling unit.

3. The power supply device according to claim 1 or 2, characterized in that: The power conversion module is electrically connected to the battery cell directly connected to the negative electrode in the power battery pack.

4. The power supply device according to claim 3, wherein: The power battery pack includes a plurality of battery cell groups, each of which includes a plurality of battery cells; a battery sampling circuit is connected to the plurality of battery cells in a group of the battery cell groups to collect electrical parameters of the plurality of battery cells in a group of the battery cell groups; The power conversion module is electrically connected to the battery cell group directly connected to the negative electrode among the plurality of battery cell groups.

5. The power supply device according to claim 1, wherein: The power supply device further includes a controller; The second sampling unit and the plurality of first sampling units communicate with the controller through an isolation module.

6. The power supply device according to claim 5, characterized in that A plurality of the first sampling units communicate serially to form a communication link, and the first sampling unit located at at least one end of the communication link communicates with the controller through one of the isolation modules; And the second sampling unit communicates with the controller through one of the isolation modules.

7. The power supply device according to claim 5, characterized in that: The second sampling unit and the plurality of the first sampling units are serially connected to form a communication link; and the second sampling unit or the first sampling unit located at at least one end of the communication link communicates with the controller through one of the isolation modules.

8. The power supply device according to claim 5, characterized in that: The isolation module includes a passive isolation module.

9. The power supply device according to claim 1, wherein: The power supply device also includes a controller, and the controller includes a first wireless communication module; at least one of the first sampling units includes a second wireless communication module; the second sampling unit includes a third wireless communication module, and the second wireless communication module and the third wireless communication module are used to communicate with the first wireless communication module.

10. An electrical device, characterized in that: The electrical device comprises the power supply device according to any one of claims 1 to 9.

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