Power battery pack and power supply method

Abstract

The invention discloses a power battery pack and a power supply method, and belongs to the technical field of power supply. The power battery pack comprises a first power supply port and a first power supply unit, and the first power supply port is configured to be connected with an external load so as to supply power to the external load; the first power supply unit is provided with a first output end and a second output end, and the first output end and the second output end are both connected with the first power supply port; wherein one of the first output end and the second output end supplies power to the first power supply port, and the voltages output to the first power supply port by the first output end and the second output end are equal based on voltage regulation. According to the invention, power redundancy of the same voltage is realized through the two output ends of one power supply unit, and it is ensured that when one output end fails, the other output end can continue to supply power. Moreover, the power supply structure is simplified, and the physical space is saved.

Description

Technical Field

[0001] This application relates to the technical field of power supply, and particularly to a power battery pack and a power supply method. Background Art

[0002] During vehicle operation, the low-voltage power system mainly supports auxiliary functions and electronic devices. By setting redundant low-voltage power supplies, the vehicle can maintain the operation of critical functions in various situations, thereby improving overall safety and reliability. However, redundant low-voltage power supply designs typically involve adding a low-voltage battery or an additional low-voltage link to ensure that when one power supply unit fails, other power supply units can continue to supply power. Although this design enhances system reliability, it also brings problems of circuit complexity. Summary of the Invention

[0003] Embodiments of this application provide a power battery pack and a power supply method, which simplify the power supply circuit while providing redundant power supplies.

[0004] In a first aspect, an embodiment of this application provides a power battery pack, which includes:

[0005] A first power supply port configured to be connected to an external load to supply power to the external load;

[0006] A first power supply unit having a first output terminal and a second output terminal, both the first output terminal and the second output terminal being connected to the first power supply port;

[0007] Wherein, one of the first output terminal and the second output terminal supplies power to the first power supply port, and the voltages output from the first output terminal and the second output terminal to the first power supply port are equal.

[0008] In some embodiments, the voltage output from the first output terminal is greater than the voltage output from the second output terminal;

[0009] The first power supply unit includes:

[0010] A first battery string,

[0011] A second battery string, the first battery string and the second battery string are connected, and both the first battery string and the second battery string are connected to the first output terminal, and the second battery string is connected to the second output port.

[0012] In some embodiments, the first power supply unit further includes:

[0013] At least one first switch component, each first switch component being connected between the first battery string and the second battery string;

[0014] The first switching component is configured to disconnect the connection between the second battery string and the first battery string when the second output terminal is powered, so that the second battery string does not supply power to the first output terminal; when the second output terminal is not powered, the connection between the second battery string and the first battery string is conducted, so that the first battery string and the second battery string supply power to the first output terminal.

[0015] In some embodiments, the first power supply unit further includes:

[0016] An auxiliary branch, disposed between two ends of the second battery string, and the auxiliary branch is connected in parallel with the second battery string and the first switching component;

[0017] The auxiliary branch is configured to be conducted when the second output terminal is powered; the auxiliary branch is disconnected when the second output terminal is not powered.

[0018] In some embodiments, a second switching component is provided on the auxiliary branch, and the second switching component is configured to control the on / off of the auxiliary branch.

[0019] In some embodiments, the device further includes: a voltage regulating unit, connected between the first output terminal and the first power supply port, for equalizing the voltages output from the first output terminal and the second output terminal to the first power supply port based on voltage regulation.

[0020] In some embodiments, the device further includes: a third switching component, connected between the second output terminal and the first power supply port, and the third switching component is configured to control the on / off between the second output terminal and the first power supply port, so that one of the first output terminal and the second output terminal supplies power to the first power supply port.

[0021] In some embodiments, the device further includes: a second power supply port;

[0022] A second power supply unit, respectively connected to the first power supply port and the second power supply port.

[0023] In some embodiments, the third switching component includes:

[0024] A first switching element;

[0025] A second switching element;

[0026] Wherein, the second output terminal is respectively connected to the first power supply port and the second power supply port through the first switching element; the second switching element is connected between the first switching element and the first power supply port, and / or, the second switching element is connected between the first switching element and the second power supply port.

[0027] In a second aspect, an embodiment of the present application further provides a power supply method for a power battery pack, which is applied to the power battery pack in the above embodiments. The method includes:

[0028] Power the first power supply port through at least one of the first output terminal and the second output terminal, wherein the voltages output from the first output terminal and the second output terminal to the first power supply port are equal.

[0029] An embodiment of the present application provides a power battery pack. The device includes: a first power supply port and a first power supply unit. The first power supply port is configured to be connected to an external load to supply power to the external load. The first power supply unit has a first output terminal and a second output terminal, and both the first output terminal and the second output terminal are connected to the first power supply port. Wherein, one of the first output terminal and the second output terminal supplies power to the first power supply port, and based on voltage regulation, the voltages output from the first output terminal and the second output terminal to the first power supply port are made equal. In the present application, power redundancy of the same voltage is achieved through two output terminals of one power supply unit, ensuring that when one output terminal fails, the other output terminal can continue to supply power. Moreover, the power supply structure is simplified and physical space is saved.

[0030] An embodiment of the present application provides a power supply method for a power battery pack, which is applied to the above-mentioned power battery pack. Therefore, this power supply method can have all the technical features and beneficial effects of the above-mentioned power battery pack, and will not be elaborated here. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a schematic block diagram of a power battery pack provided by an embodiment of the present application;

[0033] Figure 2 It is a schematic circuit diagram of a first power supply unit provided by an embodiment of the present application;

[0034] Figure 3 It is another schematic circuit diagram of a first power supply unit provided by an embodiment of the present application;

[0035] Figure 4 It is a schematic circuit diagram of a power battery pack provided by an embodiment of the present application.

[0036] Description of the Reference Numerals:

[0037] 1. First power supply port; 2. First power supply unit; 21. First output terminal; 22. Second output terminal; 23. First battery string; 24. Second battery string; 25. First switch assembly; 26. Auxiliary branch; 27. Second switch assembly; 3. Voltage regulation unit; 4. Third switch assembly; 41. First switch element; 42 - Second switch element; 5. Second power supply port; 6. Second power supply unit; 7. High-voltage power supply port. Detailed implementation manners

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0039] In the embodiments of the present application, "at least one" means one or more; "a plurality" means two or more. In the description of the present application, terms such as "first", "second", and "third" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0040] The reference to "an implementation manner" or "some implementation manners" etc. described in this specification means that specific features, structures, or characteristics described in combination with the embodiment are included in one or more implementation manners of the present application. Thus, the terms "include", "comprise", "have" and their variants in this specification all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0041] It should be noted that in the embodiments of the present application, " / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / ", unless otherwise specified, generally represents an "or" relationship between the associated objects before and after.

[0042] It should be pointed out that "connection" in the embodiments of the present application can be understood as electrical connection, and the connection of two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0043] During vehicle operation, the low-voltage power system is mainly used to support auxiliary functions and electronic devices. By setting up redundant low-voltage power supplies, the vehicle can maintain the operation of critical functions under various conditions, thus enhancing overall safety and reliability. However, redundant low-voltage power supply design usually involves adding a low-voltage battery or an additional low-voltage link to ensure that when one power supply unit fails, the other power supply units can continue to supply power. Although this design enhances the system's reliability, it also brings problems such as increased circuit complexity and harness cost.

[0044] In some embodiments, the low-voltage power supply method in the vehicle can be that the high-voltage battery delivers electrical energy to the low-voltage load system and charges the low-voltage battery through a DCDC converter. Furthermore, the backup path for low voltage in the vehicle is that when the vehicle is in a dormant state, the low-voltage battery directly powers critical systems. For example, it can be controlled by the BCM (Body Control Module). Specifically, when the vehicle is normally started, that is, in the normal power supply mode, the DCDC converter preferentially powers the low-voltage load and charges the battery at the same time. The charging strategy can be controlled by the BMS (Battery Management System). If the vehicle is in a low-power mode, that is, after the vehicle shuts off, the DCDC converter is turned off, and the low-voltage battery supplies power alone (the holding current can be about 50 mA to 500 mA). If the DCDC converter fails, the low-voltage battery serves as the only low-voltage power supply.

[0045] That is to say, new energy vehicles have eliminated the 12V generator of traditional fuel vehicles and rely on DCDC converters to achieve energy conversion from high voltage to low voltage. The low-voltage power supply can be obtained through a DCDC converter. The DCDC converter converts the direct current of the high-voltage power battery into low-voltage direct current. For example, it converts 300V - 800V of direct current into 12V / 24V. The converted low-voltage direct current powers the low-voltage loads (such as lights, instruments, ECUs, sensors, etc.) in the vehicle's low-voltage system and can charge the low-voltage battery. Among them, the low-voltage battery is used as a backup power supply. When the vehicle is dormant or the DCDC converter fails, the low-voltage battery provides emergency power supply for the low-voltage system (such as key wake-up, anti-theft system). Also, the low-voltage battery can absorb transient fluctuations in the high-voltage system to protect low-voltage devices. The low-voltage battery can be, but is not limited to, lead-acid batteries and lithium iron phosphate batteries.

[0046] In some embodiments, the low-voltage power supply in the vehicle can adopt a power redundancy design with dual outputs of the DCDC converter, that is, the DCDC converter can supply power to the low-voltage load through two lines respectively and charge two low-voltage batteries. Furthermore, both power supply lines have redundant low-voltage power supplies with low-voltage batteries and DCDC converters. When one of the power supply lines is abnormal, the other power supply line can ensure the normal operation of the vehicle and ensure the normal and safe operation of the main control and advanced driver assistance related functions.

[0047] In some other embodiments, the low-voltage power supply in the vehicle can also adopt a dual low-voltage battery design. That is, the DCDC converter can supply power to the low-voltage load through one line and charge two low-voltage batteries respectively. Furthermore, one of the power supply lines has redundancy in low-voltage power supply with the low-voltage battery and the DCDC converter, and the other power supply line is for low-voltage power supply by the low-voltage battery. Under normal circumstances, the relay on the other power supply line is conducting. If an abnormality occurs, it will be disconnected, and the other path will continue to supply power to ensure the normal and safe operation of the main control and advanced driver assistance related functions.

[0048] It can be known that the low-voltage power redundancy scheme adopts redundancy such as dual low-voltage battery redundancy or dual-output redundancy of the DCDC converter. It realizes the redundancy of low-voltage power supply by adding a low-voltage battery or adding a low-voltage link through the dual-output of the DCDC converter. Although the reliability of the system is improved, the cost is significantly increased, which brings pressure to reduce the cost of the whole vehicle, reduces the cost competitive advantage, and affects the lightweight of the whole vehicle.

[0049] In addition, the layout of the low-voltage redundant wiring harness is complicated, and it is not easy to layout the redundant low-voltage battery or the dual-output of the DCDC converter. The newly added low-voltage battery or the DCDC converter with an increased volume requires a larger layout space than before, which poses a challenge to the layout of the whole vehicle. The controller for redundant power supply requires two power supply lines. If the low-voltage battery and the DCDC converter are arranged one in front and the other behind, the power supply lines of the redundant controller arranged in front of or behind the vehicle are relatively long, increasing the wiring harness cost and the weight of the whole vehicle. And because the low-voltage battery and the DCDC converter need to be arranged indoors due to waterproof requirements, the tension of the layout space is further aggravated.

[0050] In addition, from the perspective of system stability, if a short circuit occurs in the line between the DCDC converter and the low-voltage battery, it will cause the low-voltage system of the whole vehicle to stop working, and there is a risk of vehicle breakdown, thus making the vehicle unable to run normally. When the DCDC converter fails, limited by the small capacity of the low-voltage battery, the vehicle cannot drive for a long time, and then the VCU (Vehicle Control Unit) will control the vehicle to stop and wait for rescue. In addition, in the scenario of over-the-air (OTA) upgrade of the whole vehicle, the high-voltage component controller cannot work during the installation and upgrade, and the low-voltage battery continuously consumes power. If the upgrade takes too long or fails frequently, it is very easy to have problems such as power loss and breakdown. In addition, when the low-voltage battery fails, if the vehicle wants to run again after powering off, it needs to rely on an external power supply for jump-starting. Otherwise, once it is powered off in the powered-on state, it cannot be powered on again, greatly affecting the convenience of vehicle use.

[0051] In view of this, the present application proposes a power battery pack, aiming to solve at least one of the above technical problems.

[0052] Please refer to Figure 1As shown Figure 1 is a schematic block diagram of a power battery pack provided by an embodiment of the present application.

[0053] An embodiment of the present application provides a power battery pack, and the device includes: a first power supply port 1 and a first power supply unit 2; the first power supply port 1 is configured to be connected to an external load to supply power to the external load; the first power supply unit 2 has a first output terminal 21 and a second output terminal 22, and both the first output terminal 21 and the second output terminal 22 are connected to the first power supply port 1; wherein, one of the first output terminal 21 and the second output terminal 22 supplies power to the first power supply port 1, and the voltages output from the first output terminal 21 and the second output terminal 22 to the first power supply port 1 are equal.

[0054] It should be understood that the first power supply port 1 in the present application is an electrical interface, and the first power supply port 1 can be configured to be connected to an external load through connection transmission methods such as a wire harness, a bus bar, or a wireless charging coupler. The external load can be a low-voltage load in the vehicle's vehicle low-voltage system, and it can support DC / AC power supply modes, which are specifically set according to actual implementation schemes. It should be noted that there can be multiple first power supply ports 1, that is, one of the first output terminal 21 and the second output terminal 22 can supply power to multiple first power supply ports 1 at the same time. Among them, the multiple first power supply ports 1 can be respectively arranged at different positions of the power battery pack, that is, at different positions inside the vehicle, so that the low-voltage loads of the whole vehicle can be accessed nearby. Exemplarily, three low-voltage power supply interfaces can be reserved from the left front side, the right front side, and the rear middle side of the power battery pack, and the low-voltage loads are accessed nearby, saving the wire harness cost and reducing the weight of the whole vehicle. The number and position of the first power supply ports 1 can be set according to the requirements of actual implementation schemes.

[0055] It also should be understood that the first power supply unit 2 has a first output terminal 21 and a second output terminal 22. It can be known that the output voltage of the first output terminal 21 is different from the output voltage of the second output terminal 22, and the two output terminals can work independently or cooperatively to output their respective corresponding electric energies according to the requirements of actual implementation schemes. Furthermore, in the present application, the first output terminal 21 and the second output terminal 22 can be directly or indirectly connected to the first power supply port 1 through wires, bus bars, or PCB copper foils to form a redundant power supply path. Furthermore, if one of the first output terminal 21 and the second output terminal 22 fails or is turned off, the other one supplies power to the first power supply port 1. It should be noted that the first power supply unit 2 can be a power battery.

[0056] It also should be understood that the voltages output from the two output terminals to the first power supply port 1 in the present application are equal. Furthermore, it is allowed that when one output terminal fails, the other output terminal can seamlessly take over the power supply task to ensure that the external load continuously obtains stable power supply.

[0057] Through the above technical solution, in the present application, power redundancy of the same voltage is achieved through two output terminals of a power supply unit, ensuring that when one output terminal fails, the other output terminal can continue to supply power and avoid power interruption. This redundant design improves the reliability of the system. Moreover, there is no need to add a low-voltage battery or an additional low-voltage link, reducing the number of components, thus reducing the overall weight, which helps to achieve the lightweight design goal of the whole vehicle, improve energy efficiency and cruising range. In addition, through the redundant design of the two output terminals, the wiring harness layout is simplified, and the need for additional layout space is reduced, saving physical space.

[0058] In some embodiments, the voltage output by the first output terminal 21 is greater than the voltage output by the second output terminal 22; the first power supply unit 2 includes: a first battery string 23 and a second battery string 24, the first battery string 23 and the second battery string 24 are connected, and both the first battery string 23 and the second battery string 24 are connected to the first output terminal 21, and the second battery string 24 is connected to the second output terminal 22.

[0059] It should be understood that the first power supply unit 2 may include a plurality of single cells. In some embodiments, the positive and negative electrodes of the plurality of single cells may be connected in sequence to increase the total voltage of the battery string. In other embodiments, the positive and negative electrodes of the plurality of single cells may be connected together respectively to increase the total capacity of the battery string. In still other embodiments, based on specific voltage and capacity requirements, the plurality of single cells may be combined in series and parallel connections. It is also possible to first assemble the single cells into battery modules, and then connect a plurality of modules in series or parallel, etc. The structure of the first power supply unit 2 may select a suitable connection method according to specific application requirements. Furthermore, the first battery string 23 and the second battery string may be connected to the first output terminal 21 through direct or indirect connection methods. Similarly, the second battery string 24 may also be connected to the second output terminal 22 through direct or indirect connection methods.

[0060] In the present application, the first battery string 23 includes at least one single cell connected in series, and similarly, the second battery string 24 also includes at least one single cell connected in series. Moreover, based on the connection structure of the plurality of single cells in the first power supply unit 2, the number of the first battery strings 23 and the data of the second battery strings 24 can both be one or more. The number of the first battery strings 23 and the number of single cells included in each string can be set based on the voltage and capacity requirements of the second output terminal 22. For example, for matching according to the voltage of the second output terminal 22, if the voltage requirement of the second output terminal 22 is 12V; the voltage of a single power battery cell is generally 3 - 3.5V, 3 - 3.5V multiplied by 4, which can just match the voltage of the low-voltage battery.

[0061] Exemplarily, please refer to Figure 2 as shown inFigure 2 It is a circuit schematic diagram of the first power supply unit 2 provided by an embodiment of the present application. Figure 2 In it, the positive electrodes and negative electrodes of multiple single cells are connected in sequence. Each rectangle in the figure represents a single cell, that is, multiple single cells in the first power supply unit 2 are connected in series in sequence. Then the total positive electrode of the first power supply unit 2 is the positive electrode of the first single cell. The total negative electrode of the first power supply unit 2 is the negative electrode of the last single cell. Among them, the total positive electrode of the first power supply unit 2 is connected to the first output terminal 21. In this embodiment, the middle four series-connected single cells are selected as the second battery string 24, and the positive electrode of the first single cell in the second battery string 24 is connected to the second output terminal 22. Further, the second battery string 24 divides the remaining single cells into two first battery strings 23. It should be noted that for the second battery string 24, multiple single cells at both ends of the entire first power supply unit 2 can also be selected as the second battery string 24, and the position of the second battery string 24 can be set according to the requirements of the actual implementation scheme, as long as the number of the second battery string 24 and the number of single cells included in each string meet the voltage and capacity requirements of the second output terminal 22. It should also be noted that the total negative electrode of the first power supply unit 2 is for constructing a complete current loop to ensure the effective transmission and conversion of electrical energy in the first power supply unit 2. The electrical energy output through the total positive electrode of the first power supply unit 2 needs to return to the first power supply unit 2 through the negative electrode to form a complete loop.

[0062] In another example, please refer to Figure 3 as described Figure 3 It is another circuit schematic diagram of the first power supply unit 2 provided by an embodiment of the present application. Figure 3 In it, multiple single cells are connected in a combination of series and parallel. Among them, the total positive electrode of the parallel connection is connected to the first output terminal 21. In this embodiment, two second battery strings 24 are selected, and the positive electrodes of the two second battery strings 24 connected in parallel are connected to the second output terminal 22. Further, the remaining single cells are divided into two first battery strings 23.

[0063] It should be noted that in the present application, the positions and numbers of the first battery string 23 and the second battery string 24 are not limited to the content shown in the above embodiments. The second battery string 24 that meets the voltage and capacity requirements of the second output terminal 22 can be selected in various first power supply unit 2 structures. Then, based on the positions and numbers of the second battery string 24, the positions and numbers of the first battery string 23 can be determined in combination with the structure of the first power supply unit 2.

[0064] Through the above technical solution, the present application realizes power redundancy through the first output terminal 21 connected to all the single cells in the first power supply unit 2 and the second output terminal 22 connected to the second battery string 24. Since some of the single cells in the first power supply unit 2 can also supply power to the first power supply port 1, there is no need to add new low-voltage storage batteries or dual-channel DCDC converter components, thereby reducing the vehicle cost and the vehicle weight.

[0065] In some embodiments, the first power supply unit 2 further includes: at least one first switch component 25, each first switch component 25 being connected between the first battery string 23 and the second battery string 24; the first switch component 25 is configured to disconnect the connection between the second battery string 24 and the first battery string 23 when the second output terminal 22 supplies power, so that the second battery string 24 does not supply power to the first output terminal 21; when the second output terminal 22 does not supply power, the connection between the second battery string 24 and the first battery string 23 is conducted, so that the first battery string 23 and the second battery string 24 supply power to the first output terminal 21.

[0066] It should be understood that the first switch component 25 in the present application is used to control the on-off between the first battery string 23 and the second battery string 24. Please refer to Figure 2 and Figure 3 As shown, when the first battery string 23 is connected to both ends of the second battery string 24, both ends of the second battery string 24 are connected to the first battery string 23 through the first switch component 25. It should be noted that if only one end of the second battery string 24 is connected to the first battery string 23, the second battery string 24 is connected to the first battery string 23 through one first switch component 25. For example, when the second battery string 24 is located at both ends of the series connection, at this time only one end of the second battery string 24 is connected to the first battery string 23. It can be understood that each second battery string 24 is connected to the first battery string 23 through at least one first switch component 25, specifically set according to the position of the second battery string 24.

[0067] Exemplarily, please refer to Figure 2 As shown, when the second output terminal 22 supplies power, the first switch components 25 at both ends of the second battery string 24 are both disconnected, so that the second battery string 24 is disconnected from the first battery string 23, so that the second battery string 24 does not supply power to the first output terminal 21. At this time, only the first battery string 23 supplies power to the first output terminal 21; when the second output terminal 22 does not supply power, the first switch components 25 at both ends of the second battery string 24 are both connected, conducting the connection between the second battery string 24 and the first battery string 23, so that the first battery string 23 and the second battery string 24 supply power to the first output terminal 21.

[0068] It should be noted that the first switch assembly 25 can be implemented by a variety of technologies. For example, electronic switch components such as mechanical relays, solid-state relays, MOSFETs, IGBTs, and intelligent control devices such as microcontrollers or FPGAs can be used to achieve automated and intelligent switch control. It should also be noted that the on-off control of the first switch assembly 25 in this application is not limited to PWM control and can also include other types of control methods, such as analog signal control, digital signal control, logic circuit control, etc., which are specifically set according to the actual implementation scheme.

[0069] Through the above technical solutions, the present application realizes flexible adjustment of the power supply path of the first battery string 23 according to actual needs by precisely controlling the first switch assembly 25 to adapt to diverse load requirements. Through intelligent switch management, unnecessary battery loads and long-term use can be effectively avoided, significantly reducing battery loss, thereby enhancing the reliability and stability of the system. This solution not only optimizes energy distribution but also extends the service life of the battery, ensuring the efficient operation of the system under various working conditions.

[0070] In some embodiments, the first power supply unit 2 further includes: an auxiliary branch 26 disposed between both ends of the second battery string 24, and the auxiliary branch 26 is connected in parallel with the second battery string 24 and the first switch assembly 25; the auxiliary branch 26 is configured to conduct when power is supplied at the second output terminal 22; and the auxiliary branch 26 is disconnected when power is not supplied at the second output terminal 22.

[0071] It should be understood that the auxiliary branch 26 in this application is used to replace the second battery string 24 when the second battery string 24 supplies power to the second output terminal 22, so that the line where the second battery string 24 is located remains in a connected state, and thus the first power supply unit 2 can still operate normally. Furthermore, when the second battery string 24 does not supply power to the second output terminal 22, the auxiliary branch 26 is disconnected. At this time, the first battery string 23 and the second battery string 24 are connected to jointly supply power to the first output terminal 21. It should be noted that if there are multiple second battery strings 24, the auxiliary branch 26 can correspond one-to-one with the second battery strings 24, that is, each second battery string 24 is connected in parallel with an auxiliary branch 26. The auxiliary branch 26 can also be one. It is specifically set according to the requirements of the actual implementation scheme. As long as the auxiliary branch 26 can replace the second battery string 24 when the second battery string 24 supplies power to the second output terminal 22, so that the line where the second battery string 24 is located remains in a connected state, and thus the first power supply unit 2 can still operate normally.

[0072] Exemplarily, please refer to Figure 2As shown, when power is supplied to the second output terminal 22, the first switch components 25 at both ends of the second battery string 24 are all disconnected, so that the second battery string 24 is disconnected from the first battery string 23, so that the second battery string 24 does not supply power to the first output terminal 21. At this time, the auxiliary branch 26 is turned on, so that the line where the second battery string 24 is located can still be connected. Furthermore, the first power supply unit 2 supplies power to the first output terminal 21 based on the first battery string 23; when power is not supplied to the second output terminal 22, the first switch components 25 at both ends of the second battery string 24 are all connected, and the connection between the second battery string 24 and the first battery string 23 is turned on. At this time, the auxiliary branch 26 is disconnected, so that the first battery string 23 and the second battery string 24 supply power to the first output terminal 21.

[0073] In yet another example, please refer to Figure 3 As shown, when power is supplied to the second output terminal 22, the first switch components 25 at both ends of the two second battery strings 24 are all disconnected, so that the second battery strings 24 are disconnected from the first battery string 23, so that the second battery strings 24 do not supply power to the first output terminal 21. At this time, the two auxiliary branches 26 in parallel with the two second battery strings 24 are both turned on, so that the lines where the two second battery strings 24 are located can still be connected. Furthermore, the first power supply unit 2 supplies power to the first output terminal 21 based on the first battery string 23; when power is not supplied to the second output terminal 22, the first switch components 25 at both ends of the two second battery strings 24 are all connected, and the connection between the second battery strings 24 and the first battery string 23 is turned on. At this time, the two auxiliary branches 26 are both disconnected, so that the first battery string 23 and the second battery strings 24 supply power to the first output terminal 21. It should be noted that only one auxiliary branch 26 can also be provided in this embodiment. Since Figure 3 both columns of single cells in it are used as the second battery string 24, and the second battery string 24 does not supply power to the first output terminal 21 when power is supplied to the second output terminal 22. Then any one of the auxiliary branches 26 in Figure 3 can also be used in this embodiment.

[0074] Through the above technical solution, the auxiliary branch 26 in the present application allows the system to be turned on when the second output terminal 22 is powered, ensuring the connectivity of the circuit. So that the first power supply unit 2 can maintain normal operation in any case, regardless of whether the second battery string 24 participates in power supply. In addition, through the auxiliary branch 26, the first power supply unit 2 can support the power output of both the first output terminal 21 and the second output terminal 22 at the same time, providing a wider range of application support and higher system adaptability. The existence of the auxiliary branch 26 ensures the integrity and stability of the circuit, avoids system failures that may be caused by circuit disconnection, and enhances the reliability of the overall system.

[0075] In some embodiments, a second switch assembly 27 is provided on the auxiliary branch 26, and the second switch assembly 27 is configured to control the on / off state of the auxiliary branch 26. It can be understood that when the second switch assembly 27 is turned off, the auxiliary branch 26 is turned off, and when the second switch assembly 27 is turned on, the auxiliary branch 26 is turned on. By means of the second switch assembly 27, the on / off state of the auxiliary branch 26 can be independently controlled. This enables the system to flexibly adjust the circuit configuration according to actual requirements to ensure the best power supply strategy. Moreover, in case of a fault or an abnormal situation, the second switch assembly 27 can quickly turn off the auxiliary branch 26 to prevent the fault from spreading to other circuits.

[0076] It should be noted that the first switch assembly 25 can be implemented by various technologies. For example, electronic switch elements such as mechanical relays, solid-state relays, MOSFETs, IGBTs, etc., and intelligent control devices such as microcontrollers or FPGAs can be used to achieve automated and intelligent switch control. It should also be noted that the on / off control of the first switch assembly 25 in this application is not limited to PWM control, and can also include other types of control methods, such as analog signal control, digital signal control, logic circuit control, etc., which are specifically set according to the actual implementation scheme.

[0077] Please refer to Figure 4 as shown Figure 4 which is a schematic circuit diagram of a power battery pack provided by an embodiment of the present application. In some embodiments, the device further includes: a voltage regulation unit 3, connected between the first output terminal 21 and the first power supply port 1, for regulating the voltage so that the voltages output from the first output terminal 21 and the second output terminal 22 to the first power supply port 1 are equal.

[0078] It can be understood that the core function of the voltage regulation unit 3 is to regulate the voltage so that the voltages output from the first output terminal 21 and the second output terminal 22 to the first power supply port 1 are kept consistent. This balancing function ensures the voltage consistency of different power supply paths. Furthermore, based on the equality of the voltages output from the two output terminals to the first power supply port 1. Furthermore, it allows that when a fault occurs at one output terminal, the other output terminal can seamlessly take over the power supply task to ensure that the external load continuously obtains stable power supply.

[0079] It should be noted that the voltage regulation unit 3 in this application can adopt at least one of voltage conversion devices such as DCDC converters, voltage regulators, transformers, etc., and can also adopt voltage conversion related circuits. It is specifically set according to the requirements of the actual implementation scheme.

[0080] In some embodiments, the device further includes: a third switch component 4 connected between the second output terminal 22 and the first power supply port 1. The third switch component 4 is configured to control the connection and disconnection between the second output terminal 22 and the first power supply port 1, so that one of the first output terminal 21 and the second output terminal 22 supplies power to the first power supply port 1.

[0081] It can be understood that the third switch component 4 can control the connection and disconnection of the circuit between the second output terminal 22 and the first power supply port 1. This means that it is possible to select to supply power to the first power supply port 1 from the first output terminal 21 or the second output terminal 22. If the third switch component 4 is turned on, the second output terminal 22 supplies power to the first power supply port 1. If the third switch component 4 is turned off, the first output terminal 21 supplies power to the first power supply port 1.

[0082] Through the above technical solution, in the present application, the power supply path can be flexibly selected according to the state of the third switch component 4 to adapt to different power supply requirements or fault handling. By introducing the third switch component 4, the system can automatically or manually switch to the other output terminal for power supply when a fault occurs in one output terminal, thereby improving the reliability and stability of the system. In addition, when a fault is detected in a certain output terminal, the third switch component 4 can quickly cut off the fault path to avoid the spread of the fault.

[0083] In some embodiments, the device further includes: a second power supply port 5 and a second power supply unit 6; the second power supply unit 6 is respectively connected to the first power supply port 1 and the second power supply port 5.

[0084] It can be understood that the second power supply unit 6 can use a low-voltage storage battery. The second power supply unit 6 is respectively connected to the first power supply port 1 and the second power supply port 5, and the second power supply unit 6 is connected to the voltage regulation unit 3. Then the first output terminal 21 is also respectively connected to the first power supply port 1 and the second power supply port 5, and the second output terminal 22 is also respectively connected to the first power supply port 1 and the second power supply port 5. Furthermore, each low-voltage output port is powered by multiple low-voltage power supplies, which is a redundant power supply design. When one power supply fails, the other can still work normally to ensure the continuity and reliability of the system. And, both the first power supply port 1 and the second power supply port 5 can be connected to an external load to supply power to the external load. This design realizes power supply redundancy to ensure that when one power supply path fails, the other path can still maintain the normal operation of the load. It should be noted that there can be multiple second power supply ports 5, that is, one of the first output terminal 21 and the second output terminal 22 can supply power to multiple first power supply ports 1 at the same time. Among them, the multiple first power supply ports 1 can be respectively arranged at different positions of the power battery pack, that is, at different positions inside the vehicle, so that the low-voltage loads of the whole vehicle can be accessed nearby.

[0085] In some embodiments, the third switch component 4 includes: a first switch member 41 and a second switch member 42; wherein, the second output terminal 22 is connected to the first power supply port 1 and the second power supply port 5 respectively through the first switch member 41; the second switch member 42 is connected between the first switch member 41 and the first power supply port 1, and / or, the second switch member 42 is connected between the first switch member 41 and the second power supply port 5.

[0086] It can be understood that the first switch member 41 can be connected between the connection line of the second power supply unit 6 and the voltage regulation unit 3 and the second output terminal 22; the second switch member 42 is arranged on the connection line of the second power supply unit 6 and the voltage regulation unit 3.

[0087] It can also be understood that the second switch member 42 is arranged between the first power supply unit 2 and the voltage regulation unit 3 to control the on / off between the first power supply unit 2 and the voltage regulation unit 3. The second output terminal 22 can be connected to the first power supply port 1 and the second power supply port 5 respectively through the first switch member 41. The second switch member 42 can be arranged between the first switch member 41 and the first power supply port 1, or between the first switch member 41 and the second power supply port 5, or between the first switch member 41 and the first power supply port 1 and between the first switch member 41 and the second power supply port 5, that is, there can be two second switch members 42, which are set according to the requirements of the actual implementation scheme. Furthermore, the second switch member 42 is arranged between the first power supply unit 2 and the voltage regulation unit 3, which can disconnect the connection between the first power supply unit 2 and the voltage regulation unit 3 in the case of a power supply line failure at the output of the first power supply unit 2 or a power supply line failure at the output of the voltage regulation unit 3, ensuring the normal operation of the low-voltage power supply of the other normal power supply line. The first switch member 41 can control whether the second output terminal 22 supplies power, that is, if the first switch member 41 is turned on, the second output terminal 22 supplies power. Combining the on / off control of the first switch member 41, power can be supplied to the first power supply port 1 and / or the second power supply port 5. When the first switch member 41 is turned on, the on / off states of the first switch component 25 and the second switch component 27 in the first power supply unit 2 will be changed accordingly. If the first switch member 41 is turned on, the second output terminal 22 will not supply power, and the on / off states of the first switch component 25 and the second switch component 27 in the first power supply unit 2 will be changed accordingly.

[0088] The following is an example through embodiments to illustrate the process of low-voltage power supply by the first power supply unit 2 and the second power supply unit 6:

[0089] In some embodiments, when low-voltage power supply is provided at the first output terminal 21 of the first power supply unit 2, the first switching element 41 is turned off, the second switching element 42 is turned on, the first switching assembly 25 is turned on, and the second switching assembly 27 is turned off. Then, all the battery cells in the first power supply unit 2 supply power to the first output terminal 21. The first output terminal 21 is connected to the voltage regulation unit 3. The voltage output from the first output terminal 21 is regulated by the voltage regulation unit 3 into the low voltage required by the low-voltage load. Further, the low voltage output by the voltage regulation unit 3 is transmitted to the first power supply port 1 and the second power supply port 5 respectively. At this time, if the voltage of the second power supply unit 6 is lower than the voltage output by the voltage regulation unit 3, the voltage regulation unit 3 will also transmit the low voltage to the second power supply unit 6 to charge the second power supply unit 6.

[0090] In some embodiments, when low-voltage power supply is provided at the second output terminal 22 of the first power supply unit 2, the first switching element 41 is turned on, the second switching element 42 is turned on, the first switching assembly 25 is turned off, and the second switching assembly 27 is closed. Then, the first battery string 23 in the first power supply unit 2 supplies power to the first output terminal 21. At this time, the voltage output from the first output terminal 21 cannot supply power to the power supply port through the voltage regulation unit 3. The second output terminal 22 can supply low-voltage power to the first power supply port 1 and the second power supply port 5 respectively based on the fact that the first switching element 41 is turned on and the second switching element 42 is turned on. At this time, if the voltage of the second power supply unit 6 is lower than the voltage output by the second output terminal 22, the second output terminal 22 will also transmit the low voltage to the second power supply unit 6 to charge the second power supply unit 6.

[0091] In some embodiments, when the second power supply unit 6 supplies low-voltage power, the first switching element 41 is turned on, the second switching element 42 is turned off, the first switching assembly 25 is turned on, and the second switching assembly 27 is turned off. Then, all the single battery cells in the first power supply unit 2 supply power to the first output terminal 21. At this time, the voltage output from the first output terminal 21 cannot supply power to the power supply port through the voltage regulation unit 3. The second output terminal 22 does not need to supply power. The second power supply unit 6 can supply low-voltage power to the first power supply port 1 and the second power supply port 5 respectively based on the fact that the second switching element 42 is turned on.

[0092] It should be noted that in this application, the second switch 42 is provided between the first switch 41 and the second power supply port 5 as an example. If there is no abnormal situation, the second switch 42 is in a normally closed state and the first switch 41 is in a normally open state. If the power supply line corresponding to the first power supply port 1 or the power supply line corresponding to the second power supply port 5 is short-circuited, the second switch 42 will open. At this time, only the power supply port without a fault can supply power to the low-voltage load. If the first power supply port 1 is a normal port, the power supply source of the first power supply port 1 can be one of the first output terminal 21 and the second output terminal 22. If the second power supply port 5 is a normal port, the power supply source of the second power supply port 5 can be at least one of the second output terminal 22 and the second power supply unit 6. In addition, it should be noted that the voltage output by the first output terminal 21 cannot supply power to the power supply port through the voltage regulation unit 3, which may be due to a fault or shutdown of the voltage regulation unit 3.

[0093] This application proposes a power battery pack, which integrates a voltage regulation unit 3 and a second power supply unit 6 inside. The power battery pack can be provided with multiple power supply ports at different positions, so that the low-voltage loads of the whole vehicle can be accessed nearby. In addition, power redundancy is achieved by the second power supply unit 6, the voltage regulation unit 3 and the second battery string 24 inside the second power supply unit 6, without adding new low-voltage battery or dual DCDC converter components. At the same time, the power of the low-voltage battery can be reduced, thereby reducing the cost of the whole vehicle and the weight of the whole vehicle. Moreover, the layout of the low-voltage wiring harness is easy, and at the same time, the length of the low-voltage wiring harness is shortened, reducing the wiring harness cost.

[0094] It should be noted that the power battery pack proposed in this application can also integrate a BMS controller, which is configured to control the charging and discharging of the power battery. It can also control the discharge of the second battery string 24, that is, control the second battery string 24 to change the discharge object by controlling the first switch assembly 25 and the second switch assembly 27. It can also send a work enable to the DCDC converter. It can also estimate the battery information of the first power supply unit 2. It can also perform battery fault detection and processing on the first power supply unit 2, etc. Among them, when the vehicle is under high-voltage power-off, the second power supply unit 6 supplies power to the BMS controller.

[0095] In addition, the power battery pack can also integrate an IBS controller, which is configured to monitor the state of the second power supply unit 6. It can also be configured to request the voltage and current of the voltage regulation unit 3 to charge the second power supply unit 6. It can also estimate the battery information of the second power supply unit 6. It can also perform battery fault detection and processing on the second power supply unit 6, etc.

[0096] The power battery pack can also integrate a fuse box. When a short circuit occurs in each low-voltage load, the fuse box cuts off the power supply to this low-voltage load to ensure the normal operation and power distribution of the low-voltage main circuit. In addition, the power battery pack is also provided with a high-voltage output port, and the first output terminal 21 can be connected to the high-voltage output port to supply power to the high-voltage load through the high-voltage output port.

[0097] In a second aspect, an embodiment of the present application also provides a power supply method for a power battery pack, which is applied to the power battery pack in the above embodiment. The method includes:

[0098] Supply power to the first power supply port 1 with at least one of the first output terminal 21 and the second output terminal 22, and based on voltage regulation, make the voltages output from the first output terminal 21 and the second output terminal 22 to the first power supply port 1 equal.

[0099] It can be understood that in the present application, power redundancy of the same voltage is achieved through the two output terminals of a power supply unit to ensure that when one output terminal fails, the other output terminal can continue to supply power and avoid power supply interruption. It can be known that when the vehicle may have the following single-point fault failures, there may be a risk of the whole vehicle breaking down: for example, there may be a DCDC fault / failure during vehicle driving. When the DCDC converter fails, the scheme without dual DCDC converter output power supply can only rely on the remaining power of the low-voltage battery to drive for generally only 10 to 30 minutes. After the low-voltage battery runs out of power, the vehicle breaks down. There may also be a low-voltage power supply fault, which means that when the low-voltage battery fails, the vehicle can be powered on and driven without a redundant low-voltage battery scheme (relying on the DCDC converter to convert the voltage of the power battery to maintain). Once the vehicle is powered off, it cannot be powered on and started again. There may also be no high voltage for the whole vehicle, which means that when a serious fault occurs in the whole vehicle, the high-voltage relay of the power battery disconnects, and there is no high-voltage power for the whole vehicle. Furthermore, when the high-voltage system of the vehicle fails and goes high, due to the limited power of the low-voltage battery, the demand time for the double flash lights when waiting for rescue by the roadside is long, and the power may not be able to support until the rescue arrives, and there is a certain safety hazard when the visibility is poor. There may also be a short circuit in the power supply line, which means that when one of the low-voltage power supply lines is short-circuited, the fuse of the short-circuited line needs to be disconnected and the vehicle is driven by the other low-voltage power supply line. There may also be an OTA upgrade of high-voltage components, which means that when the high-voltage components are OTA upgraded (except the BMS controller), the high-voltage relay of the power battery disconnects, and there is no high-voltage power for the whole vehicle. Furthermore, when the OTA high-voltage components of the whole vehicle are upgraded, if the upgrade process is slow or the upgrade fails, that is, the upgrade time is long, the low-voltage battery will run out of power and the vehicle cannot be powered on and driven.

[0100] Based on the risk of the entire vehicle breaking down when the above-mentioned single-point failure occurs, the power supply method of the power battery pack further includes: in response to the single-point failure signal, controlling the on / off of the first switch assembly 25, the second switch assembly 27, and the third switch assembly 4, so that at least one of the first output terminal 21, the second output terminal 22, and the second power supply unit 6 supplies power to the low-voltage load.

[0101] In some embodiments, if the single-point failure signal indicates a short circuit in the power supply line, that is, a short circuit in the power supply line corresponding to one of the first power supply port 1 and the second power supply port 5. Then control the second switch 42 to disconnect to ensure the normal operation of the other power supply line. Specifically, if the first power supply port 1 is the normal port, the power supply source of the first power supply port 1 can be one of the first output terminal 21 and the second output terminal 22. If the second power supply port 5 is the normal port, the power supply source of the second power supply port 5 can be at least one of the second output terminal 22 and the second power supply unit 6.

[0102] In some embodiments, if the single-point failure signal indicates a DCDC converter failure / failure, no high voltage in the entire vehicle, or OTA upgrade of high-voltage components during vehicle driving. Then control the first switch 41 to conduct and the second switch 42 to conduct, and jointly ensure vehicle driving by providing additional power through the second battery string 24 in the first power supply unit 2 and the second power supply unit 6. Specifically, at this time, the power supply sources of the first power supply port 1 and the second power supply port 5 can be at least one of the second power supply unit 6 and the second output terminal 22.

[0103] In some embodiments, if the single-point failure signal indicates a low-voltage power supply failure. Then when the vehicle powers off high voltage, the first switch 41 can be controlled to conduct and the second switch 42 to conduct, and the second battery string 24 in the first power supply unit 2 provides the power for the entire vehicle to wake up and power on high voltage again. After the vehicle powers on high voltage again, control the first switch 41 to conduct and the second switch 42 to disconnect. Furthermore, when the vehicle powers on high voltage, the low-voltage load is powered by the voltage regulation unit 3. When the vehicle powers off high voltage, the low-voltage load is powered by at least one of the second battery string 24 and the second power supply unit 6. It should be noted that when the vehicle powers off high voltage, it is in the vehicle-off or sleep state. At this time, the first power supply unit 2 does not provide high-voltage power externally, and the second battery string 24 in the first power supply unit 2 supplies low-voltage power through the second output terminal 22. When the vehicle powers on high voltage, it is in the vehicle-start state. At this time, all battery cells in the first power supply unit 2 supply low-voltage power through the first output terminal 21 via the voltage regulation unit 3.

[0104] It should be noted that the single-point failure signal can be sourced from the BMS monitoring a fault and controlling the on / off states of the corresponding first switch assembly 25, second switch assembly 27, and third switch assembly 4, so as to execute the corresponding power supply method. The control states corresponding to the first switch assembly 25 and the second switch assembly 27 for each power supply source can be referred to the previous embodiments and will not be elaborated here.

[0105] It should also be noted that the second power supply unit 6 uses a low-voltage battery with a small capacity and is prone to the risk of discharging. When the IBS controller monitors that the low-voltage battery has a low power level, it can request the power battery to replenish the power, that is, request the power battery to supply power through the first output terminal 21, and supply power to the second power supply unit 6 through the voltage regulation unit 3. However, if charging cannot be carried out through the first output terminal 21, the first power supply unit can continue to replenish the power of the second power supply unit 6 through the second output terminal 22. It can be understood that the intelligent power replenishment strategy can largely avoid the risk that the whole vehicle cannot be powered on due to the discharge of the low-voltage battery and requires external power supply for jump-starting. It can be understood that the present application aims to solve the vehicle operation problem in the single-point failure scenario, ensure that the vehicle can continue to drive when a fault occurs, and ensure the normal operation of the low-voltage battery, thereby reducing the risk of vehicle breakdown. In addition, considering the consistency of the power battery monomers, the present application only allows the use of the second output terminal 22 of the first power supply unit 2 under specific working conditions. To avoid the consistency problem caused by the long-term use of the second output terminal 22, a control mechanism for the first switch assembly 25 and the second switch assembly 27 is also added to determine whether to let these batteries participate in the low-voltage power supply work. It can be understood that the embodiment of the present application provides a power supply method for a power battery pack applied to the above-mentioned power battery pack. Therefore, this power supply method can have all the technical features and beneficial effects of the above-mentioned power battery pack and will not be elaborated here.

[0106] It should be noted that the power battery pack provided in the embodiment of the present application and the power supply method of the power battery pack in the above embodiment belong to the same concept. Any method provided in the power supply method embodiment can be run on the power battery pack. The specific implementation process is detailed in the power supply method embodiment and will not be elaborated here. Among the embodiments, embodiments, and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0107] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not elaborated in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0108] The above are only the preferred embodiments of the present application and do not impose any formal restrictions on the present application. Although the present application has been disclosed above in its preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present application. However, as long as it does not depart from the content of the technical solution of the present application, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A power battery pack, characterized in that, Comprising: A first power supply port (1), configured to be connected to an external load to supply power to the external load; A first power supply unit (2), having a first output terminal (21) and a second output terminal (22), both the first output terminal (21) and the second output terminal (22) being connected to the first power supply port (1); Wherein, one of the first output terminal (21) and the second output terminal (22) supplies power to the first power supply port (1), and the voltages output from the first output terminal (21) and the second output terminal (22) to the first power supply port (1) are equal.

2. The power battery pack according to claim 1, wherein The voltage output from the first output terminal (21) is greater than the voltage output from the second output terminal (22); The first power supply unit (2) includes: A first battery string (23), A second battery string (24), the first battery string (23) and the second battery string (24) being connected, and both the first battery string (23) and the second battery string (24) being connected to the first output terminal (21), and the second battery string (24) being connected to the second output terminal (22).

3. The power battery pack according to claim 2, characterized in that, The first power supply unit (2) further includes: At least one first switch component, each first switch component being connected between the first battery string (23) and the second battery string (24); The first switch component is configured to disconnect the connection between the second battery string (24) and the first battery string (23) when the second output terminal (22) supplies power, so that the second battery string (24) does not supply power to the first output terminal (21); when the second output terminal (22) does not supply power, the connection between the second battery string (24) and the first battery string (23) is conducted, so that the first battery string (23) and the second battery string (24) supply power to the first output terminal (21).

4. The power battery pack according to claim 3, wherein, The first power supply unit (2) further includes: An auxiliary branch (26), disposed between the two ends of the second battery string (24), and the auxiliary branch (26) being in parallel with the second battery string (24) and the first switch component; The auxiliary branch (26) is configured to be conducted when the second output terminal (22) supplies power; and to be disconnected when the second output terminal (22) does not supply power.

5. The power battery pack according to claim 4, wherein A second switch component (27) is provided on the auxiliary branch (26), and the second switch component (27) is configured to control the on / off of the auxiliary branch (26).

6. The power battery pack according to claim 2, characterized in that Further comprising: A voltage regulation unit (3), connected between the first output terminal (21) and the first power supply port (1), for equalizing the voltages output from the first output terminal (21) and the second output terminal (22) to the first power supply port (1) based on voltage regulation.

7. The power battery pack according to claim 2, wherein Further comprising: A third switch component (4) is connected between the second output terminal (22) and the first power supply port (1). The third switch component (4) is configured to control the on / off between the second output terminal (22) and the first power supply port (1), so that one of the first output terminal (21) and the second output terminal (22) supplies power to the first power supply port (1).

8. The power battery pack according to claim 7, characterized in that, Further comprising: A second power supply port (5); A second power supply unit (6) is respectively connected to the first power supply port (1) and the second power supply port (5).

9. The power battery pack according to claim 8, wherein The third switch component (4) includes: A first switch element (41); A second switch element (42); Wherein, the second output terminal (22) is respectively connected to the first power supply port (1) and the second power supply port (5) through the first switch element (41); the second switch element (42) is connected between the first switch element (41) and the first power supply port (1), and / or the second switch element (42) is connected between the first switch element (41) and the second power supply port (5).

10. A power supply method for a power battery pack, characterized in that, Applied to the power battery pack according to any one of claims 1-9, the method includes: Powering the first power supply port (1) through at least one of the first output terminal (21) and the second output terminal (22), wherein the voltages output from the first output terminal (21) and the second output terminal (22) to the first power supply port (1) are equal.

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