A power battery charging maintenance system

Abstract

The application provides a power battery charging maintenance system, which comprises a charging maintenance device and a power battery to be maintained. When a low-voltage power supply detects that a charging socket is connected to an external charging pile, the low-voltage power supply supplies power to a controller and the power battery to be maintained, and wakes up the controller, so that the controller sends a battery maintenance signal to a battery management system of the power battery to be maintained. Then, when the battery management system is woken up and receives the battery maintenance signal, the battery management system performs high-voltage power-on on the power battery to be maintained, so that the external charging pile connected to the charging socket charges and maintains the power battery to be maintained. The system realizes charging maintenance based on an external charging pile, can realize charging maintenance of each power battery based on an existing charging pile, does not need to separately configure a high-voltage power supply, reduces charging maintenance implementation cost and implementation difficulty, and solves the problems of time-consuming and labor-consuming in the prior art that power batteries are repeatedly disassembled for charging maintenance.

Description

Technical Field

[0001] This application relates to the field of vehicle power battery technology, specifically to a power battery charging and maintenance system. Background Technology

[0002] Currently, most electric vehicles use lithium-ion batteries as their power batteries. However, lithium-ion batteries inevitably experience self-discharge. Therefore, it is necessary to charge and maintain power batteries that have been stored for a long time to prevent over-discharge and subsequent battery failure.

[0003] Existing power battery maintenance methods require specialized charging and discharging equipment in a laboratory and professional personnel to perform the charging and discharging maintenance. Typically, maintenance is only performed at the power battery supplier's location, or the individual power batteries are mounted on the vehicle for charging and discharging maintenance.

[0004] However, the solution of using professional charging and discharging equipment in the laboratory is expensive, has high requirements for site and personnel, and is difficult to implement, which is not conducive to the implementation of users such as manufacturers and repair service shops. The solution of mounting the power battery on the vehicle requires disassembling and replacing the power battery for each maintenance. The power battery is heavy and requires professional disassembly tools, which is time-consuming and labor-intensive. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, this application aims to provide a power battery charging and maintenance system to solve the problems of high difficulty, high cost and time and labor in implementing charging and maintenance in the prior art.

[0006] This application provides a power battery charging and maintenance system, including a charging and maintenance device and a power battery to be maintained. The charging and maintenance device includes a charging socket, a controller, a low-voltage power supply, a low-voltage wiring harness, and a high-voltage wiring harness. The power battery to be maintained includes a battery management system.

[0007] The low-voltage power supply, the power battery to be maintained, and the controller are connected via the low-voltage wiring harness, and the charging socket is connected to the power battery to be maintained via the high-voltage wiring harness.

[0008] The low-voltage power supply is used to supply power to the controller and the power battery to be maintained when the charging socket is detected to be connected to an external charging pile, and to wake up the controller when power is supplied to the controller;

[0009] The controller is used to send a battery maintenance signal to the battery management system when it is woken up;

[0010] The battery management system is used to perform a high-voltage power-on operation on the power battery to be maintained when it is woken up and receives the battery maintenance signal, and to charge and maintain the power battery to be maintained through the external charging pile after the high-voltage power-on is completed.

[0011] Optionally, the controller is further configured to, upon being woken up, hardwire the battery management system in the power battery to be maintained; or,

[0012] The battery management system is also used to automatically wake up when it detects that the charging socket is connected to an external charging pile.

[0013] Optionally, the battery management system is further configured to determine, based on the battery maintenance signal, whether the power battery to be maintained meets the preset charging conditions before performing a high-voltage power-on operation on the power battery to be maintained. If so, it sends a high-voltage power-on request to the controller and receives a high-voltage power-on instruction from the controller based on the high-voltage power-on request, and performs the high-voltage power-on operation based on the high-voltage power-on instruction.

[0014] The controller is also configured to send a high-voltage power-on command back to the battery management system when it receives a high-voltage power-on request from the battery management system.

[0015] Optionally, the battery management system is further configured to determine whether the power battery to be maintained meets preset charging conditions based on the battery temperature of the power battery to be maintained, whether there is a high voltage fault, the resistance value of the external charging pile, and whether a handshake message sent by the external charging pile is received.

[0016] Optionally, the battery management system is further configured to send various interaction messages to the external charging pile after the high voltage is powered on, so that the external charging pile can perform charging maintenance on the power battery to be maintained based on each of the interaction messages.

[0017] Optionally, the battery management system is also used to control the pre-charge relay, the main negative relay and the main positive relay in the power battery to be maintained to close sequentially, and to control the pre-charge relay to open, so as to complete the high-voltage power supply to the power battery to be maintained.

[0018] Optionally, the battery management system is further configured to determine whether the power battery to be maintained meets the charging end conditions during the charging and maintenance process of the external charging pile. If so, the charging and maintenance of the power battery to be maintained by the external charging pile is stopped, and a high-voltage power-off operation is performed on the power battery to be maintained.

[0019] Optionally, the battery management system is further configured to determine whether the power battery to be maintained meets the charging termination conditions based on the current state of charge of the power battery to be maintained, whether there is a low-voltage fault, the current temperature, the resistance of the external charging pile, whether there is a charging interaction fault, or whether the controller has a communication timeout.

[0020] Optionally, the battery management system is further configured to send a high-voltage power-down request to the controller before performing a high-voltage power-down operation on the power battery to be maintained, and receive a high-voltage power-down command fed back by the controller based on the high-voltage power-down request, and perform the high-voltage power-down operation based on the high-voltage power-down command;

[0021] The controller is also configured to send a high-voltage power-down command back to the battery management system when it receives a high-voltage power-down request from the battery management system.

[0022] Optionally, the low-voltage power supply is provided by a low-voltage battery, or the low-voltage power supply is provided by the external charging station.

[0023] In summary, this application proposes a power battery charging and maintenance system. The system includes a charging and maintenance device and a power battery to be maintained. The power battery to be maintained, the low-voltage power supply in the charging and maintenance device, and the controller are connected via a low-voltage wiring harness. The charging socket in the charging and maintenance device is connected to the power battery to be maintained via a high-voltage wiring harness. When the low-voltage power supply detects that the charging socket is connected to an external charging pile, it supplies power to the controller and the power battery to be maintained and wakes up the controller, causing it to send a battery maintenance signal to the battery management system of the power battery to be maintained. Upon being woken up and receiving the battery maintenance signal, the battery management system applies high-voltage power to the power battery to be maintained, enabling the external charging pile connected to the charging socket to charge and maintain the power battery. This system achieves charging and maintenance based on external charging piles through the charging and maintenance device, thus enabling charging and maintenance of each power battery based on existing charging piles. It eliminates the need for a separate high-voltage power supply for charging and maintenance, reducing implementation costs and difficulty. Furthermore, it eliminates the need to install and remove the power battery from the vehicle, solving the time-consuming and labor-intensive problem of repeatedly removing and removing the power battery for charging and maintenance in existing technologies. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a power battery charging and maintenance system provided in an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of components of a power battery charging and maintenance system provided in an embodiment of this application;

[0027] Figure 3 This is a schematic diagram illustrating the connection between a power battery to be maintained and a charging socket, provided in an embodiment of this application.

[0028] Figure 4 This is a schematic diagram of the discharge interface connection of a power battery to be maintained, provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of an insulation treatment provided in an embodiment of this application;

[0030] Figure 6 This is another schematic diagram of the connection between the power battery to be maintained and the charging socket provided in the embodiment of this application;

[0031] Figure 7 This is a schematic diagram of the connection between the components of a power battery to be maintained and a charging maintenance device provided in an embodiment of this application;

[0032] Figure 8 This is a schematic diagram of the connection relationship of a power battery charging and maintenance system provided in an embodiment of this application;

[0033] Figure 9 This is a flowchart of a controller processing according to an embodiment of this application;

[0034] Figure 10 This is a processing flowchart of a battery management system provided in an embodiment of this application. Detailed Implementation

[0035] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] As mentioned in the background section, this application proposes a power battery charging and maintenance system to address the problems in the prior art. Figure 1 This is a schematic diagram of the structure of a power battery charging and maintenance system provided in an embodiment of this application. See also... Figure 1 The power battery charging and maintenance system specifically includes a charging and maintenance device 1 and a power battery 2 to be maintained. The charging and maintenance device 1 includes a charging socket 10, a controller 11, a low-voltage power supply 12, a low-voltage wiring harness 13, and a high-voltage wiring harness 14. The power battery 2 to be maintained includes a battery management system 20. The low-voltage power supply 12, the power battery 2 to be maintained, and the controller 11 are connected via the low-voltage wiring harness 13. The charging socket 10 and the power battery 2 to be maintained are connected via the high-voltage wiring harness 13. Wherein:

[0038] The low-voltage power supply 12 is used to supply power to the controller 11 and the power battery 2 to be maintained when the charging socket 10 is detected to be connected to an external charging pile, and to wake up the controller 11 when power is supplied to the controller 11.

[0039] Controller 11 is used to send a battery maintenance signal to battery management system 20 when it is woken up;

[0040] The battery management system 20 is used to perform a high-voltage power-on operation on the power battery 2 to be maintained when it is woken up and receives a battery maintenance signal, and to charge and maintain the power battery 2 to be maintained through an external charging pile after the high-voltage power-on is completed.

[0041] In this embodiment, the charging maintenance device 1 includes a charging socket 10, a controller 11, a low-voltage power supply 12, a low-voltage wiring harness 13, and a high-voltage wiring harness 14. The charging maintenance device provided in this embodiment may also include a maintenance device stand, and the charging socket 10 and the controller 11 can be bolted to the maintenance device stand.

[0042] For example, such as Figure 2 As shown, Figure 2 This is a schematic diagram of components of a power battery charging and maintenance system provided in an embodiment of this application. The charging and maintenance device may include a maintenance device stand, which provides insertion holes for socket mounting bolts and controller mounting bolts. The charging socket can be installed by sequentially fixing it and inserting the socket mounting bolts into the holes; similarly, the controller can be installed by sequentially fixing it and inserting the controller mounting bolts into the holes. In the maintenance device stand, the low-voltage power supply 12 can be a 12V battery, which can be placed directly on the maintenance device stand or fixed to it with bolts. Optionally, the maintenance device stand can be movable to facilitate connection to various external charging piles or to various power batteries to be maintained, improving the convenience and efficiency of battery maintenance.

[0043] In this embodiment, the low-voltage power supply 12 is used to power the controller 11 and the battery management system 20 of the power battery 2 to be maintained, so that the controller 11 and the battery management system 20 can perform charging maintenance.

[0044] Optionally, the low-voltage power supply 12 is provided by a low-voltage battery, or it can be provided by an external charging station. That is, the low-voltage power supply 12 can be provided by a 12V battery or by an external charging station. The external charging station is a device used to charge the electric vehicle and can be an existing electric vehicle charging station.

[0045] This method enables the provision of low-voltage power based on low-voltage batteries or external charging stations. When the external charging station has low-voltage output capabilities, it can directly provide low-voltage power, further reducing charging maintenance costs. When some external charging stations lack low-voltage output capabilities, a 12V low-voltage battery can be used to provide power instead. It should be noted that for power batteries in commercial vehicle platforms requiring maintenance, if their compatible low-voltage power supply is 24V, two 12V low-voltage batteries connected in series can be used to provide low-voltage power.

[0046] Specifically, the low-voltage power supply 12 is connected to the controller 11 via the low-voltage wiring harness 13. The power battery 2 to be maintained includes a low-voltage interface and a high-voltage interface. The low-voltage power supply 12 is connected to the low-voltage interface of the power battery 2 to be maintained via the low-voltage wiring harness 13. The controller 11 and the low-voltage interface of the power battery 2 to be maintained can be connected via the low-voltage wiring harness 13.

[0047] In this embodiment, the charging socket 10 in the charging maintenance device 1 is used to connect to the high-voltage interface of the power battery 2 to be maintained through the high-voltage wiring harness 14, and provides a charging gun insertion interface for an external charging pile, so as to connect the external charging pile when the charging gun is inserted and deliver the high-voltage electricity from the external charging pile to the power battery 2 to be maintained.

[0048] For example, Figure 3 This is a schematic diagram illustrating the connection between a power battery to be maintained and a charging socket, as provided in an embodiment of this application. The charging socket can be connected to the fast-charging interface in the high-voltage interface of the power battery to be maintained via a high-voltage wiring harness, which includes a positive cable and a negative cable.

[0049] Considering that some power batteries under maintenance also include discharge interfaces in their high-voltage interfaces, this embodiment can further insulate the discharge interfaces of power batteries with discharge interfaces. For example, Figure 4 This is a schematic diagram of the discharge interface connection of a power battery to be maintained, provided in an embodiment of this application. One end of the high-voltage harness (including the positive cable and the negative cable) is connected to the discharge interface, and the other end is insulated. Figure 5 This is a schematic diagram of an insulation treatment provided in an embodiment of this application. The end of a high-voltage wire harness that requires insulation treatment can be treated according to... Figure 5 The insulation structure on display has been treated.

[0050] For example, Figure 6 This is a schematic diagram illustrating another connection between a power battery to be maintained and a charging socket, provided in an embodiment of this application. The high-voltage interface of the power battery to be maintained includes a discharge interface and a fast-charging interface. The fast-charging interface is connected to the charging socket via a high-voltage wiring harness, and the charging socket is connected to an external charging pile. The discharge interface is connected to a high-voltage wiring harness with one end insulated.

[0051] For example, Figure 7 This is a schematic diagram illustrating the connection between the components of a power battery to be maintained and a charging maintenance device, as provided in an embodiment of this application. The power battery to be maintained can be connected to a controller and a low-voltage power supply via a low-voltage wiring harness, and to a charging socket via a high-voltage wiring harness.

[0052] Figure 8 This is a schematic diagram illustrating the connection relationships of a power battery charging and maintenance system according to an embodiment of this application. Taking a 12V battery as an example, it shows the connection relationships of various components in the power battery charging and maintenance system, as well as the connection relationship between the power battery charging and maintenance system and an external charging pile. Each resistor can be 120Ω, and the positive terminal of the 12V battery can be connected in sequence to a 10A fuse and a switch.

[0053] Specifically, if the low-voltage power supply 12 detects that the charging socket 10 is connected to an external charging pile, for example, when the charging gun of the external charging pile is inserted into the charging socket 10, it can start supplying power to the controller 11 and the power battery 2 to be maintained, and wake up the controller 11 through the power supply signal. At this time, the power battery 2 to be maintained can be woken up by the woken controller 11, or it can be automatically woken up when the charging socket 10 is detected to be connected to an external charging pile.

[0054] In one alternative implementation, the controller 11 is further configured to wake up the battery management system 20 in the power battery 2 under maintenance via a hardwired connection when it is woken up; or, the battery management system 20 is further configured to self-wake up when it detects that the charging socket 10 is connected to an external charging pile.

[0055] That is, the controller 11 can complete initialization upon being woken up, and after initialization, output a hard-wired high-level signal to wake up the battery management system 20 via hard-wired connection; or, the battery management system supports CC2 (i.e., charging connection confirmation) wake-up, automatically waking up in response to the insertion of the charging gun of the external charging pile into the charging socket 10. Through these methods, multiple wake-up modes, such as self-wake-up or hard-wired wake-up, can be achieved for the battery management system, ensuring subsequent battery maintenance via the battery management system.

[0056] Furthermore, after both the controller 11 and the battery management system 20 are awakened, the controller 11 can generate a battery maintenance signal and send it to the battery management system 20. The battery management system 20 can then perform high-voltage power-on after initialization is complete and the battery maintenance signal is received.

[0057] In an optional implementation, the battery management system 20 is further configured to determine, based on the battery maintenance signal, whether the power battery 2 to be maintained meets the preset charging conditions before performing a high-voltage power-on operation on the power battery 2 to be maintained. If so, it sends a high-voltage power-on request to the controller 11 and receives a high-voltage power-on command fed back by the controller 11 based on the high-voltage power-on request, and performs a high-voltage power-on operation based on the high-voltage power-on command. The controller 11 is further configured to feed back a high-voltage power-on command to the battery management system 20 when it receives the high-voltage power-on request sent by the battery management system 20.

[0058] The preset charging conditions can include conditions such as whether the battery temperature meets the preset temperature, whether the battery power meets the preset power, and whether there is a high voltage fault.

[0059] Specifically, after receiving a battery maintenance signal, the battery management system 20 can first determine whether the power battery 2 to be maintained meets the preset charging conditions. If it does, it sends a high-voltage power-on request (such as a CAN signal) to the controller 11. The controller 11 then sends a high-voltage power-on command back to the battery management system 20 based on the received high-voltage power-on request. Furthermore, the battery management system 20 performs high-voltage power-on according to the high-voltage power-on command. The controller 11 can also determine whether the power battery 2 to be maintained is in a high-voltage power-on state when it receives the high-voltage power-on request. If not, it sends a high-voltage power-on command back to the battery management system 20.

[0060] By determining whether preset charging conditions are met before applying high voltage, charging and maintenance of the power battery in case of a fault is avoided, thus ensuring the safety of charging and maintenance.

[0061] Optionally, the battery management system 20 is also used to determine whether the power battery 2 to be maintained meets the preset charging conditions based on the battery temperature of the power battery to be maintained, whether there is a high voltage fault, the resistance of the external charging pile, and whether a handshake message sent by the external charging pile is received.

[0062] The preset charging conditions include the battery temperature being within a preset temperature range, the absence of high-voltage electrical faults, the external charging pile having a valid resistance value (i.e., meeting the requirements), and receiving a handshake message from the external charging pile.

[0063] The preset temperature range can be the safe operating temperature of the power battery, such as -20 degrees to 55 degrees. The external charging station can generate a handshake message and send it to the battery management system 20 when it detects that the user has completed swiping their card.

[0064] Specifically, if the battery temperature of the power battery to be maintained is within the preset temperature range, there is no high-voltage fault, the resistance of the external charging pile is valid, and a handshake message sent by the external charging pile is received, then the battery management system 20 can determine that the power battery 2 to be maintained meets the preset charging conditions. By determining the preset charging conditions, charging maintenance of the power battery can be avoided when the battery temperature is too high, the battery temperature is too low, there is a high-voltage fault, the resistance of the external charging pile does not meet the requirements, or the user has not swiped their card, thus further ensuring the safety of charging maintenance.

[0065] Furthermore, the battery management system 20 can perform high-voltage power-on operation. In one specific embodiment, the battery management system 20 is also used to control the pre-charge relay, the main negative relay, and the main positive relay in the power battery 2 to be maintained to close sequentially, and to control the pre-charge relay to open, so as to complete the high-voltage power-on of the power battery 2 to be maintained.

[0066] That is, after the battery management system 20 sequentially closes the pre-charge relay, the main negative relay, and the main positive relay, it opens the pre-charge relay to complete the high-voltage power supply to the power battery 2 to be maintained. The battery management system 20 achieves high-voltage power supply to the power battery 2 to be maintained by controlling the opening and closing of each relay.

[0067] The battery management system 20 can also send a high-voltage power-on completion signal to the controller 11 after the high-voltage power-on is completed, so that the controller 11 can determine that the power battery 2 to be maintained is in a high-voltage power-on state based on the high-voltage power-on completion signal.

[0068] After the high-voltage power-on is completed, the power battery 2 under maintenance can be charged and maintained via an external charging station.

[0069] Optionally, the battery management system 20 is also used to send various interactive messages to the external charging pile after the high voltage is powered on, so that the external charging pile can perform charging maintenance on the power battery 2 to be maintained based on the various interactive messages.

[0070] Specifically, after the high voltage is energized, the battery management system 20 can send messages to the external charging pile. That is, the battery management system 20 can send interactive messages to the external charging pile in stages. For example, the battery management system 20 sends various interactive messages to the external charging pile in accordance with the "Communication Protocol between Off-board Conductive Charger and Battery Management System for Electric Vehicles" (GB / T 27930-2015). After each interactive message is sent, the external charging pile starts charging the power battery 2 to be maintained, so as to realize the charging maintenance of the power battery 2 to be maintained.

[0071] In the above method, the battery management system 20 sends various interactive messages to the external charging pile, and starts charging the power battery to be maintained after the message delivery is completed, thus ensuring the safety of charging and maintenance of the power battery.

[0072] It should be noted that during the charging process of the external charging pile for the power battery 2 under maintenance, the battery management system 20 can continuously monitor charging-related information and determine whether the charging termination conditions are met. Once the charging termination conditions are met, the charging maintenance of the power battery 2 under maintenance will be stopped.

[0073] In one optional implementation, the battery management system 20 is further configured to determine whether the power battery 2 to be maintained meets the charging end conditions during the charging and maintenance process of the external charging pile. If so, the charging and maintenance of the power battery 2 to be maintained by the external charging pile is stopped, and a high-voltage power-off operation is performed on the power battery 2 to be maintained.

[0074] The charging termination conditions can include reaching a preset state of charge, the presence of a low-voltage electrical fault, or the current temperature being outside a preset temperature range. Specifically, the battery management system 20 monitors in real time whether the power battery 2 to be maintained meets the charging termination conditions. If it does, it stops the external charging pile from charging the power battery 2. By monitoring in real time whether the charging termination conditions are met, the safety of charging maintenance is further ensured, and the user does not need to manually stop the charging maintenance.

[0075] Optionally, the battery management system 20 is also used to determine whether the power battery 2 to be maintained meets the charging termination conditions based on the current state of charge of the power battery to be maintained, whether there is a high voltage fault, the current temperature, the resistance of the external charging pile, whether there is a charging interaction fault or whether the controller has a communication timeout.

[0076] The charging termination conditions may include at least one of the following: the current state of charge reaches a preset state of charge, a high-voltage fault exists, the current temperature is not within a preset charging range, the resistance of the external charging pile is invalid, a charging interaction fault exists, or the controller communication times out. Charging interaction faults can be those specified in national standards. The preset state of charge can be a pre-set state of charge threshold, such as 100%.

[0077] Specifically, if the current state of charge of the power battery 2 to be maintained reaches the preset state of charge, a high-voltage fault exists, the current temperature is not within the preset charging range, the resistance of the external charging pile is invalid, a charging interaction fault exists, or the controller communication times out, then it can be determined that the power battery 2 to be maintained meets the charging termination conditions. Through this method, it is avoided to continue charging and maintaining the battery when it is fully charged, a high-voltage fault exists, the temperature is too high or too low, the resistance of the external charging pile is invalid, a charging interaction fault exists, or the controller communication times out, thus further ensuring the safety of charging and maintenance.

[0078] Furthermore, when the battery management system 20 determines that the power battery 2 to be maintained meets the charging termination conditions, it can stop the external charging pile from charging the power battery 2 to be maintained by sending various stop charging interaction messages to the external charging pile. Specifically, the battery management system 20 can complete the message interaction according to the provisions of "GB / T 27930-2015 Communication Protocol between Off-board Conductive Charger and Battery Management System for Electric Vehicles". Upon receiving the various stop charging interaction messages, the external charging pile will terminate the charging of the power battery 2 to be maintained.

[0079] Furthermore, after the charging of the power battery 2 under maintenance is completed, the battery management system 20 can perform high-voltage power-off on the power battery 2 under maintenance.

[0080] In one specific implementation, the battery management system 20 is further configured to send a high-voltage power-down request to the controller 11 before performing a high-voltage power-down operation on the power battery 2 to be maintained, and receive a high-voltage power-down command fed back by the controller 11 based on the high-voltage power-down request, and perform a high-voltage power-down operation based on the high-voltage power-down command; the controller 11 is further configured to feed back a high-voltage power-down command to the battery management system 20 when it receives the high-voltage power-down request sent by the battery management system 20.

[0081] That is, before the battery management system 20 needs to cut off the high voltage, it can send a high voltage cut-off request to the controller 11. The controller 11 generates a high voltage cut-off command based on the received high voltage cut-off request and feeds it back to the battery management system 20. Then the battery management system 20 performs the high voltage cut-off operation according to the high voltage cut-off command.

[0082] The controller 11 can also determine whether the power battery 2 to be maintained is in a high-voltage power-on state when it receives a high-voltage power-off request. If so, it generates a high-voltage power-off command and feeds it back to the battery management system 20. By sending a high-voltage power-off request to the controller 11 and executing the high-voltage power-off operation according to the high-voltage power-off command fed back by the controller 11, the safety of the power battery under high-voltage power-off is ensured.

[0083] Furthermore, the battery management system 20 can execute a high-voltage power-down procedure. Specifically, the battery management system 20 can sequentially disconnect the main positive relay and the main negative relay. After the main positive relay and the main negative relay are disconnected, the battery management system 20 can also send a high-voltage power-down completion signal to the controller 11, so that the controller 11 can determine that the power battery 2 to be maintained is in a high-voltage power-down state based on the high-voltage power-down completion signal. Then, the controller 11 can terminate the hard-wired wake-up of the battery management system 20, and the battery management system 20 can enter a sleep state.

[0084] For example, Figure 9 This is a flowchart of a controller processing according to an embodiment of this application. The controller can be woken up by a hard-wired signal from a low-voltage power supply, and initialized. It then determines whether initialization is complete. If initialization is incomplete, it returns to continue initialization. If initialization is complete, a hard-wired high level wakes up the BMS (Battery Management System), and a battery maintenance signal is generated and sent to the BMS.

[0085] Furthermore, the controller can receive a high-voltage power-on request sent by the BMS. It determines whether it has received the high-voltage power-on request from the BMS. If not, it returns to wake up the BMS again. If yes, it sends a high-voltage power-on command to the BMS and can receive a high-voltage power-on completion signal from the BMS to determine whether the high-voltage power-on is complete. If the high-voltage power-on is not complete, it checks if a 5-second timeout has occurred. If no 5-second timeout has occurred, it returns to send a high-voltage power-on command to the BMS. If a 5-second timeout has occurred, it sends a high-voltage power-off command to the BMS.

[0086] If the high-voltage power-on is completed, the controller can receive the high-voltage power-off request sent by the BMS, determine whether the high-voltage power-off request has been received or whether the communication has timed out. If not, it will return to continue receiving the high-voltage power-off request sent by the BMS. If yes, it will send the high-voltage power-off command to the BMS.

[0087] Furthermore, after sending a high-voltage power-down command to the BMS, the controller can receive a high-voltage power-down completion signal from the BMS and determine whether the high-voltage power-down is complete. If the high-voltage power-down is not complete, it checks if a 30-second timeout has occurred. If the timeout is within 30 seconds, it continues to send high-voltage power-down commands to the BMS. If the timeout exceeds 30 seconds, it stops hard-wired wake-up of the BMS and enters sleep mode. If the high-voltage power-down is complete, it stops hard-wired wake-up of the BMS and enters sleep mode.

[0088] For example, Figure 10 This is a processing flowchart of a battery management system provided in an embodiment of this application. The battery management system can be woken up by a hard-wired signal or CC2 and perform initialization. If initialization is incomplete, it returns to continue initialization. If initialization is complete, it receives a battery maintenance signal from the controller and determines whether preset charging conditions are met. If the preset charging conditions are not met, it can enter sleep mode or return to continue determining whether the preset charging conditions are met.

[0089] If the preset charging conditions are met, a high-voltage power-on request is sent to the controller, and a high-voltage power-on command is received from the controller. The pre-charge relay, main negative relay, and main positive relay are closed in sequence, and then the pre-charge relay is opened. A high-voltage power-on completion signal is sent to the controller.

[0090] Furthermore, the battery management system can complete signal interaction with the external charging pile according to the national standard charging procedure to start charging. During the charging process, the battery management system determines whether the charging termination conditions are met. If the charging termination conditions are not met, charging can continue. If the charging termination conditions are met, it completes signal interaction and terminates charging according to the national standard charging procedure, sends a high-voltage power-off request to the controller, sequentially disconnects the main positive relay and the main negative relay, sends a high-voltage power-off completion signal back to the controller, and then enters sleep mode. The battery management system can also perform condition checks before entering sleep mode to determine whether the sleep mode conditions are met.

[0091] The power battery charging and maintenance system provided in this application includes a charging and maintenance device and a power battery to be maintained. The power battery to be maintained, the low-voltage power supply in the charging and maintenance device, and the controller are connected via a low-voltage wiring harness. The charging socket in the charging and maintenance device is connected to the power battery to be maintained via a high-voltage wiring harness. When the low-voltage power supply detects that the charging socket is connected to an external charging pile, it supplies power to the controller and the power battery to be maintained and wakes up the controller, so that the controller sends a battery maintenance signal to the battery management system of the power battery to be maintained. Then, when the battery management system is woken up and receives the battery maintenance signal, it applies high voltage to the power battery to be maintained, so that the external charging pile connected to the charging socket can charge and maintain the power battery to be maintained. This system realizes charging and maintenance based on external charging piles through the charging and maintenance device, and can realize charging and maintenance of each power battery based on existing charging piles. There is no need to configure a separate high-voltage power supply for charging and maintenance, which reduces the implementation cost and difficulty of charging and maintenance. Furthermore, there is no need to install and remove the power battery to the vehicle, which solves the time-consuming and labor-intensive problem of repeatedly removing and removing the power battery for charging and maintenance in the prior art.

[0092] Compared with existing charging and discharging equipment located in laboratories, the power battery charging and maintenance system provided in this application embodiment can charge and maintain each power battery to be maintained through existing charging piles via a charging and maintenance device. This enables maintenance and charging to be carried out wherever there are DC charging piles, greatly improving the convenience of charging and maintenance. Furthermore, the charging and maintenance device has low cost and does not require the development of a charging power supply. Compared with existing charging and discharging equipment, it greatly reduces the implementation cost of charging and maintenance and is suitable for widespread use.

[0093] Furthermore, the system charging and maintenance process provided in this embodiment is simple. It only requires connecting the power battery to the low-voltage and high-voltage wiring harnesses and turning on the charging pile normally. The operation is simple and requires minimal skill from the operators. In existing technologies, the power battery is mounted on the vehicle, resulting in a relatively heavy battery (usually several hundred kg). This method requires the removal and installation of the power battery, which necessitates specialized tools and is time-consuming and labor-intensive. In contrast, the system provided in this embodiment eliminates the need to install each power battery on the vehicle for charging and maintenance before removing it, thus improving the efficiency of power battery charging and maintenance.

[0094] It should be noted that the terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the scope of this application. As shown in the specification and claims of this application, unless the context clearly indicates otherwise, words such as "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, or apparatus. Without further limitations, an element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element.

[0095] It should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0096] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A power battery charging and maintenance system, characterized in that, It includes a charging maintenance device and a power battery to be maintained. The charging maintenance device includes a charging socket, a controller, a low-voltage power supply, a low-voltage wiring harness, and a high-voltage wiring harness. The power battery to be maintained includes a battery management system. The low-voltage power supply, the power battery to be maintained, and the controller are connected via the low-voltage wiring harness, and the charging socket is connected to the power battery to be maintained via the high-voltage wiring harness. The low-voltage power supply is used to supply power to the controller and the power battery to be maintained when the charging socket is detected to be connected to an external charging pile, and to wake up the controller when power is supplied to the controller; The controller is configured to send a battery maintenance signal to the battery management system when it is woken up; the controller is also configured to send a high-voltage power-on command back to the battery management system when it receives a high-voltage power-on request from the battery management system. The battery management system is used to perform a high-voltage power-on operation on the power battery to be maintained when it is woken up and receives the battery maintenance signal, and to charge and maintain the power battery to be maintained through the external charging pile after the high-voltage power-on is completed. The battery management system is further configured to, before performing a high-voltage power-on operation on the power battery to be maintained, determine whether the power battery to be maintained meets preset charging conditions based on the battery maintenance signal. If so, it sends a high-voltage power-on request to the controller and receives a high-voltage power-on command from the controller based on the high-voltage power-on request, and performs the high-voltage power-on operation based on the high-voltage power-on command. The battery management system is also configured to determine whether the power battery to be maintained meets preset charging conditions based on the battery temperature of the power battery to be maintained, whether there is a high-voltage power-on fault, the resistance value of the external charging pile, and whether a handshake message sent by the external charging pile is received. The battery management system is also configured to control the pre-charge relay, the main negative relay, and the main positive relay in the power battery to be maintained to close sequentially, and control the pre-charge relay to open, so as to complete the high-voltage power-on of the power battery to be maintained. The charging maintenance device also includes a mobile maintenance device stand, which provides insertion holes for the mounting bolts of the charging socket and the mounting bolts of the controller. The low-voltage power supply is placed directly on the maintenance device stand or fixed to the maintenance device stand by bolts.

2. The system according to claim 1, characterized in that, The controller is further configured to, upon being woken up, hardwire the battery management system in the power battery to be maintained; or... The battery management system is also used to automatically wake up when it detects that the charging socket is connected to an external charging pile.

3. The system according to claim 1, characterized in that, The battery management system is also used to send various interaction messages to the external charging pile after the high voltage is powered on, so that the external charging pile can charge and maintain the power battery to be maintained based on the interaction messages.

4. The system according to claim 1, characterized in that, The battery management system is also used to determine whether the power battery to be maintained meets the charging end conditions during the charging and maintenance process of the external charging pile. If so, the charging and maintenance of the power battery to be maintained by the external charging pile is stopped, and a high-voltage power-off operation is performed on the power battery to be maintained.

5. The system according to claim 4, characterized in that, The battery management system is also used to determine whether the power battery to be maintained meets the charging termination conditions based on the current state of charge of the power battery to be maintained, whether there is a low-voltage fault, the current temperature, the resistance of the external charging pile, whether there is a charging interaction fault, or whether the controller has a communication timeout.

6. The system according to claim 4, characterized in that, The battery management system is further configured to send a high-voltage power-down request to the controller before performing a high-voltage power-down operation on the power battery to be maintained, and receive a high-voltage power-down command fed back by the controller based on the high-voltage power-down request, and perform the high-voltage power-down operation based on the high-voltage power-down command; The controller is also configured to send a high-voltage power-down command back to the battery management system when it receives a high-voltage power-down request from the battery management system.

7. The system according to claim 1, characterized in that, The low-voltage power supply is provided by a low-voltage battery, or by the external charging station.

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