Battery pack charging system, method and electric vehicle

Abstract

The present invention belongs to the technical field of electric vehicles, and discloses a battery pack charging system, method and electric vehicle for battery replacement. The battery pack charging system includes: a battery module, a battery interface circuit, a charger and a charging interface circuit; wherein the battery module includes a battery pack, a controller and a high-voltage relay connected in sequence; the charging interface circuit outputs a first connection signal to the controller; the battery interface circuit outputs a second connection signal to the charger; the controller closes the high-voltage relay according to the first connection signal and the second connection signal to charge the battery pack; the controller is also used to disconnect the high-voltage relay when a fault condition or a full charge condition is met, thereby stopping the charging of the battery pack. The present invention realizes automatic control of the relay by improving the interface circuit, preventing damage to the battery pack due to human factors while ensuring safe and reliable charging.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a battery pack charging system and method and an electric vehicle. Background Art

[0002] At present, with the gradual development of new energy, the battery pack replacement mode is increasingly accepted by the public. After the battery pack is replaced from the car, it needs to be charged at the battery swap station. At present, when the battery pack is charged, the internal relay is manually controlled by the host computer to attract and disconnect, which has certain safety risks and is prone to misoperation or missed operation, causing certain damage to the battery pack relay. In order to ensure that the battery pack is charged safely, reliably, conveniently and quickly in the single pack state and protect the battery pack, the charging control method of the battery pack in the single pack state needs to be improved. Summary of the invention

[0003] The main purpose of the present invention is to provide a battery pack charging system, method and electric vehicle for battery replacement, aiming to solve the technical problem of the prior art that high-voltage relays are prone to misoperation when controlled manually through a host computer.

[0004] To achieve the above-mentioned purpose, the present invention provides a battery pack charging system for battery replacement, the battery pack charging system for battery replacement includes: a battery module, a battery interface circuit, a charger and a charging interface circuit; wherein the battery interface circuit is connected to the battery module, the charging interface circuit is connected to the charger, the battery module includes a battery pack, a controller and a high-voltage relay connected in sequence, the control end of the high-voltage relay is connected to the controller, and the controlled end of the high-voltage relay is connected to the battery pack and the battery interface circuit;

[0005] The charging interface circuit is used to output a first connection signal to the controller when connected to the battery interface circuit;

[0006] The battery interface circuit is used to output a second connection signal to the charger when connected to the charging interface circuit;

[0007] The controller is configured to close the high-voltage relay according to the first connection signal and the second connection signal when the current mode logic voltage is within an available range, so that the charger outputs a DC power supply to the battery pack through the charging interface circuit and the battery interface circuit, thereby charging the battery pack;

[0008] The controller is also used to disconnect the high-voltage relay when a fault condition or a full-charge condition is met, thereby stopping charging the battery pack.

[0009] Optionally, the charging interface circuit is further configured to output a wake-up signal to the controller when connected to the battery interface circuit;

[0010] The controller is configured to operate when the wake-up signal is detected, and to be in standby mode when the wake-up signal is not detected.

[0011] Optionally, the charging interface circuit includes first to fifteenth interfaces;

[0012] The battery interface circuit includes sixteenth to thirtieth interfaces, the sixteenth and seventeenth interfaces are respectively connected to the controller, the eighteenth interface is grounded, the nineteenth to twenty-eighth interfaces are respectively connected to the controller, and the twenty-ninth and thirtieth interfaces are respectively connected to the battery pack;

[0013] When the charging interface circuit is connected to the battery interface circuit, the first to fifteenth interfaces are connected to the sixteenth to thirtieth interfaces in a one-to-one correspondence.

[0014] Optionally, the charging interface circuit includes: first to fifth resistors, a first switch and a second switch, wherein the first resistor is connected in series between the first interface and the second interface, the first end of the second resistor is connected to the third interface, the second end of the second resistor is connected to the first end of the first switch, the second end of the first switch is connected to the detection end of the charger, the first end of the third resistor is connected to the first end of the second resistor, the second end of the third resistor is connected to the second end of the first switch, the first end of the fourth resistor is connected to the second section of the first switch, and the second end of the fourth resistor is connected to the regulated power supply;

[0015] The fourth interface and the fifth interface are respectively connected to the communication interface of the charger;

[0016] The sixth interface and the seventh interface are connected in series and then connected to the positive output terminal of the low-voltage power supply of the charger, the first end of the second switch is connected to the eighth interface, and the second end of the second switch is connected to the node between the sixth interface and the seventh interface;

[0017] The ninth interface is grounded, the tenth interface is connected to the ninth interface, the tenth interface is also connected to the negative output terminal of the low-voltage power supply of the charger, and the eleventh interface is connected to the tenth interface through the fifth resistor;

[0018] The twelfth interface and the thirteenth interface are vacant;

[0019] The fourteenth interface and the fifteenth interface are respectively connected to the negative output terminal of the high-voltage power supply and the positive output terminal of the high-voltage power supply of the charger.

[0020] Optionally, the first switch is used to disconnect when the third interface is connected to the eighteenth interface, thereby outputting a second connection signal to the charger.

[0021] Optionally, the charger is used to output a charging voltage to the battery pack through the fourteenth interface, the fifteenth interface, the twenty-ninth interface and the thirtieth interface when the high-voltage relay is closed, so as to charge the battery pack;

[0022] The charger is further configured to output a communication signal to the controller when the fourth interface and the fifth interface are connected to the nineteenth interface and the twentieth interface respectively;

[0023] The controller is further used to detect the charging current according to the communication signal, and when the charging current meets the fault condition, disconnect the high-voltage relay to stop charging the battery pack.

[0024] Optionally, the controller is further configured to send a stop signal to the charger when a full charging condition is met;

[0025] The charger is further configured to disconnect the second switch according to the shutdown signal, thereby cutting off the wake-up signal.

[0026] Optionally, the charger is used to shut down the DC power output when the second connection signal is interrupted.

[0027] In addition, to achieve the above-mentioned purpose, the present invention also proposes a battery pack charging method, which is applied to the battery pack charging system as described above, and the battery pack charging system includes: a battery module, a battery interface circuit, a charger and a charging interface circuit; wherein the battery pack interface circuit is connected to the battery module, the charging interface circuit is connected to the charger, the battery module includes a battery pack, a controller and a high-voltage relay connected in sequence, the control end of the high-voltage relay is connected to the controller, and the controlled end of the high-voltage relay is connected to the battery pack and the battery interface circuit;

[0028] The battery pack charging method includes:

[0029] When the charging interface circuit is connected to the battery interface circuit, the charging interface circuit outputs a first connection signal to the controller;

[0030] When the battery interface circuit is connected to the charging interface circuit, the battery interface circuit outputs a second connection signal to the charger;

[0031] When the current mode logic voltage is within the available range, the controller closes the high-voltage relay according to the first connection signal and the second connection signal, so that the charger outputs a DC power supply to the battery pack through the charging interface circuit and the battery interface circuit, thereby charging the battery pack;

[0032] When a fault condition or a full charge condition is met, the controller disconnects the high-voltage relay, thereby stopping charging the battery pack.

[0033] In addition, to achieve the above-mentioned purpose, the present invention also proposes an electric vehicle, which includes the battery replacement battery pack charging system as described above.

[0034] The present invention provides a battery replacement battery pack charging system, which includes: a battery module, a battery interface circuit, a charger and a charging interface circuit; wherein the battery interface circuit is connected to the battery module, the charging interface circuit is connected to the charger, the battery module includes a battery pack, a controller and a high-voltage relay connected in sequence, the control end of the high-voltage relay is connected to the controller, and the controlled end of the high-voltage relay is connected to the battery pack and the battery interface circuit; the charging interface circuit is used to output a first connection signal to the controller when connected to the battery interface circuit; the battery interface circuit is used to output a second connection signal to the charger when connected to the charging interface circuit; the controller is used to close the high-voltage relay according to the first connection signal and the second connection signal when the current mode logic voltage is in an available range, so that the charger outputs a DC power supply to the battery pack through the charging interface circuit and the battery interface circuit, thereby charging the battery pack; the controller is also used to disconnect the high-voltage relay when a fault condition or a full charge condition is met, thereby stopping charging the battery pack. By improving the interface circuit, automatic control of the relay is achieved, preventing damage to the battery pack due to human factors while ensuring safe and reliable charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0036] Figure 1 This is a schematic diagram of the functional modules of an embodiment of a battery replacement battery pack charging system of the present invention;

[0037] Figure 2This is a circuit connection diagram of an embodiment of a battery replacement battery pack charging system of the present invention;

[0038] Figure 3 It is a flow chart of the first embodiment of the battery replacement battery pack charging system of the present invention.

[0039] Description of Figure Numbers:

[0040] Label name Label name 10 Battery Module R1~R5 The first to fifth resistors 11 Controller K1 First switch 12 High voltage relay K2 Second switch 13 Battery Pack U1 Regulated power supply 20 Battery interface circuit A~O Interfaces 1 to 15 30 Charging interface circuit a~o Interfaces 16 to 30 40 Charger GND Grounding

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] refer to Figure 1 , Figure 1 This is a schematic diagram of the functional modules of an embodiment of a battery replacement battery pack charging system of the present invention;

[0047] The battery replacement battery pack 13 charging system includes: a battery module 10, a battery interface circuit 20, a charger 40 and a charging interface circuit 30; wherein the battery interface circuit 20 is connected to the battery module 10, the charging interface circuit 30 is connected to the charger 40, the battery module 10 includes a battery pack 13, a controller 11 and a high-voltage relay 12 connected in sequence, the control end of the high-voltage relay 12 is connected to the controller 11, and the controlled end of the high-voltage relay 12 is connected to the battery pack 13 and the battery interface circuit 20;

[0048] The charging interface circuit 30 is used to output a first connection signal to the controller 11 when connected to the battery interface circuit 20 .

[0049] It should be noted that the charging interface circuit 30 can be encapsulated in the socket of the charger 40. When the charging interface circuit 30 is connected to the battery interface circuit 20, the controller 11 in the battery module 10 can detect a number of level signals. At this time, the several level signals detected by the controller 11 are the first connection signals.

[0050] The battery interface circuit 20 is used to output a second connection signal to the charger 40 when connected to the charging interface circuit 30 .

[0051] It is understandable that the charger 40 may include a processor, which can compare and process the received signals.

[0052] It should be noted that the battery interface circuit 20 can be encapsulated in the socket of the charger 40. When the battery interface circuit 20 is connected to the charging interface circuit 30, the charger 40 can also detect a number of level signals. At this time, the number of level signals detected by the charger 40 are the second connection signals.

[0053] In this embodiment, the first connection signal can enable the controller 11 to determine whether the battery module 10 is normally connected to the socket of the charger 40, and the second connection signal can enable the charger 40 to determine whether the battery pack socket is connected.

[0054] The controller 11 is used to close the high-voltage relay 12 according to the first connection signal and the second connection signal when the current mode logic voltage is in an available range, so that the charger 40 outputs a DC power supply to the battery pack 13 through the charging interface circuit 30 and the battery interface circuit 20, thereby charging the battery pack 13.

[0055] It can be understood that the controller 11 can be a battery management chip or system of the vehicle, which can detect the current mode logic voltage, which is a differential logic level used to determine whether the communication is normal. In a specific implementation, when the devices at both ends of the relevant circuit use the same power supply, DC coupling can be used, and no devices need to be added. When the devices at both ends of the transmitter and receiver use different power supplies, AC coupling is generally considered.

[0056] It should be understood that only when the current mode logic voltage is normal, the charger 40 determines that the battery pack 13 plug is connected, and the controller 11 determines that the battery module 10 is normally connected to the charger 40 socket, will the high-voltage relay 12 be closed to connect the charging circuit, so that the charger 40 can output the DC power to the battery pack 13 to charge the battery pack 13.

[0057] The controller 11 is further configured to disconnect the high-voltage relay 12 when a fault condition or a full-charge condition is met, thereby stopping charging the battery pack 13 .

[0058] In this embodiment, the fault condition is judged according to the GB27930 standard, which may include a charger 40 fault and a battery pack 13 fault. Since this embodiment can be applied to charging battery packs 13 of various electric vehicles, this embodiment does not limit the specific fault condition indicators.

[0059] Furthermore, the charging interface circuit 30 is also used to output a wake-up signal to the controller 11 when connected to the battery interface circuit 20 .

[0060] The controller 11 is configured to operate when the wake-up signal is detected, and to be in standby mode when the wake-up signal is not detected.

[0061] It is understandable that in order to maintain the service life of the controller 11 and reduce unnecessary energy consumption, a signal is needed to trigger the operation and suspension of the controller 11, and this signal is the wake-up signal. When the charger 40 socket is connected to the battery pack socket, the charging interface circuit 30 outputs the wake-up signal to the controller 11, triggering the controller 11 to work, and the wake-up signal is maintained until the controller 11 determines that the battery pack 13 is fully charged, and feeds back the full charge status to the charger 40, at which time the wake-up signal stops being output.

[0062] The present embodiment proposes a battery pack 13 charging system, the battery pack 13 charging system comprises: a battery module 10, a battery interface circuit 20, a charger 40 and a charging interface circuit 30; wherein the battery interface circuit 20 is connected to the battery module 10, the charging interface circuit 30 is connected to the charger 40, the battery module 10 comprises a battery pack 13, a controller 11 and a high-voltage relay 12 connected in sequence, the control end of the high-voltage relay 12 is connected to the controller 11, and the controlled end of the high-voltage relay 12 is connected to the battery pack 13 and the battery interface circuit 20; the charging interface circuit 30 is used for connecting to the battery interface circuit 20, Output a first connection signal to the controller 11; the battery interface circuit 20 is used to output a second connection signal to the charger 40 when connected to the charging interface circuit 30; the controller 11 is used to close the high-voltage relay 12 according to the first connection signal and the second connection signal when the current mode logic voltage is in the available range, so that the charger 40 outputs a DC power supply to the battery pack 13 through the charging interface circuit 30 and the battery interface circuit 20, thereby charging the battery pack 13; the controller 11 is also used to disconnect the high-voltage relay 12 when a fault condition or a full charge condition is met, thereby stopping charging the battery pack 13. By improving the interface circuit, automatic control of the relay is realized, preventing damage to the battery pack 13 due to human factors while ensuring safe and reliable charging.

[0063] Further, refer to Figure 2 , Figure 2 This is a circuit connection diagram of an embodiment of a charging system for a battery replacement battery pack 13 of the present invention;

[0064] The charging interface circuit 30 includes first to fifteenth interfaces A-O.

[0065] It can be understood that the charging interface circuit 30 can be packaged in a charger plug, and the first to fifteenth interfaces A-O thereof correspond one-to-one to the fifteen pins of the charger plug respectively.

[0066] The battery interface circuit 20 includes sixteenth to thirtieth interfaces a~o, the sixteenth a and the seventeenth interface b are respectively connected to the controller 11, the eighteenth interface c is grounded GND, the nineteenth to twenty-eighth interfaces d~n are respectively connected to the controller 11, and the twenty-ninth and thirtieth interfaces are respectively connected to the battery pack 13.

[0067] It is understandable that the battery interface circuit 20 can be packaged in a battery pack socket, and its sixteenth to thirtieth interfaces a-o correspond one-to-one with the fifteen sockets of the battery pack socket respectively.

[0068] When the charging interface circuit 30 is connected to the battery interface circuit 20 , the first to fifteenth interfaces A-O are connected to the sixteenth to thirtieth interfaces a-o in a one-to-one correspondence.

[0069] It is understandable that the charger plug and the battery pack socket can be normally connected during use, thereby connecting the charging interface circuit 30 and the battery interface circuit 20 .

[0070] Further, continue to refer to Figure 2 ;

[0071] The charging interface circuit 30 includes: first to fifth resistors R1~R5, a first switch K1 and a second switch K2, wherein the first resistor R1 is connected in series between the first interface A and the first interface B, the first end of the second resistor R2 is connected to the third interface C, the second end of the second resistor R2 is connected to the first end of the first switch K1, the second end of the first switch K1 is connected to the detection end of the charger 40, the first end of the third resistor R3 is connected to the first end of the second resistor R2, the second end of the third resistor R3 is connected to the second end of the first switch K1, the first end of the fourth resistor R4 is connected to the second section of the first switch K1, and the second end of the fourth resistor R4 is connected to the voltage-stabilized power supply U1.

[0072] It should be noted that the first resistor R1 is used to output a mode confirmation signal, and the mode confirmation signal can be included in the first connection signal. When the charging interface circuit 30 is connected to the battery interface circuit 20, the controller 11 determines whether the battery pack 13 is in the whole vehicle mode or the single battery pack 13 mode. In this embodiment, the resistance value of the first resistor R1 is 12Ω. When the controller 11 detects that the resistance between the sixteenth interface a and the seventeenth interface b corresponding to the first interface A and the first interface B is 12Ω, the controller 11 determines that it is in the single battery pack 13 state.

[0073] It can be understood that the first switch K1 is a normally closed switch, which is opened when the power is on and closed when the power is off; the second resistor R2, the third resistor R3, the first switch K1 and the fourth resistor R4 constitute a sampling circuit, which can simulate the fast charging CC1 signal. When the charging interface circuit 30 is connected to the battery interface circuit 20, the first switch K1 is opened, and the charger 40 detects a first voltage. When the charging interface circuit 30 is disconnected from the battery interface circuit 20, the first switch K1 is closed, and the charger 40 detects a second voltage. The first voltage is different from the second voltage, so the charger 40 can determine whether the battery pack socket is connected based on the detected voltage.

[0074] The fourth interface D and the fifth interface E are respectively connected to the communication interface of the charger 40 .

[0075] It should be noted that the communication interface may be a CAN transceiver interface chip, which has two output terminals CANH and CANL connected to the physical bus, and the state of the CANH terminal can only be a high level or a suspended state, and the CANL terminal can only be a low level or a suspended state. In this embodiment, the fourth interface D corresponds to CANL, and the fifth interface E corresponds to CANH, which is used to realize communication with the controller 11.

[0076] The sixth interface F is connected in series with the seventh interface G and then connected to the positive output terminal of the low-voltage power supply of the charger 40. The first end of the second switch K2 is connected to the eighth interface H, and the second end of the second switch K2 is connected to the node between the sixth interface F and the seventh interface G.

[0077] It can be understood that the low-voltage power supply supplies power to the controller 11 so that the controller 11 can work normally.

[0078] It should be noted that the second switch K2 is a normally closed switch. When the battery pack 13 is not fully charged, the second switch K2 is closed, so that the charging interface circuit 30 outputs a wake-up signal to trigger the controller 11 to work. When the battery pack 13 is fully charged, the controller 11 sends a signal to the charger 40 through the bus, so that the charger 40 opens the second switch K2, disconnects the wake-up signal, and puts the controller 11 into standby mode.

[0079] The ninth interface I is grounded GND, the tenth interface J is connected to the ninth interface I, the tenth interface J is also connected to the negative output terminal of the low-voltage power supply of the charger 40, and the eleventh interface K is connected to the tenth interface J through the fifth resistor R5.

[0080] It should be noted that the eleventh interface K is connected to the fifth resistor R5 and the ground GND, and can simulate the CC2 signal to enable the controller 11 to determine whether the battery pack 13 is normally connected to the socket of the charger 40.

[0081] The twelfth interface L and the thirteenth interface M are vacant.

[0082] The fourteenth interface N and the fifteenth interface O are respectively connected to the negative output terminal of the high-voltage power supply and the positive output terminal of the high-voltage power supply of the charger 40 .

[0083] Further, continue to refer to Figure 2 ;

[0084] The first switch K1 is used to be disconnected when the third interface C is connected to the eighteenth interface c, thereby outputting a second connection signal to the charger 40 .

[0085] It can be understood that the first switch K1 is a normally closed switch, which is opened when the power is on and closed when the power is off; the second resistor R2, the third resistor R3, the first switch K1 and the fourth resistor R4 constitute a sampling circuit, which can simulate the fast charging CC1 signal. When the charging interface circuit 30 is connected to the battery interface circuit 20, the first switch K1 is opened, and the charger 40 detects a first voltage. When the charging interface circuit 30 is disconnected from the battery interface circuit 20, the first switch K1 is closed, and the charger 40 detects a second voltage. The first voltage is different from the second voltage, so the charger 40 can determine whether the battery pack socket is connected according to the detected voltage. The second connection signal at least includes the first voltage detected by the charger 40 at this time.

[0086] Further, continue to refer to Figure 2 ;

[0087] The charger 40 is used to output a charging voltage to the battery pack 13 through the fourteenth interface N, the fifteenth interface O, the twenty-ninth interface and the thirtieth interface when the high-voltage relay 12 is closed, so as to charge the battery pack 13;

[0088] The charger 40 is further configured to output a communication signal to the controller 11 when the fourth interface D and the fifth interface E are connected to the nineteenth interface d and the twentieth interface e respectively.

[0089] In this embodiment, the communication protocol between the charger 40 and the controller 11 is the CAN bus protocol.

[0090] The controller 11 is further used to detect the charging current according to the communication signal, and when the charging current meets the fault condition, disconnect the high-voltage relay 12 to stop charging the battery pack 13.

[0091] It should be noted that the controller 11 and the charger 40 can communicate via the CAN line according to the GB27930 standard. The controller 11 can dynamically adjust the charging current of the battery pack 13. When a fault occurs, the charging can be effectively disconnected and a fault alarm can be issued.

[0092] Further, continue to refer to Figure 2 ;

[0093] The controller 11 is further configured to send a shutdown signal to the charger 40 when a full charging condition is met.

[0094] It can be understood that the shutdown signal is a signal sent by the controller 11 through the bus.

[0095] The charger 40 is further configured to disconnect the second switch K2 according to the shutdown signal, thereby cutting off the wake-up signal.

[0096] It is understandable that when the charger 40 receives the shutdown signal, it can output a level to disconnect the second switch K2 and cut off the wake-up signal.

[0097] Further, continue to refer to Figure 2 ;

[0098] The charger 40 is used to shut down the DC power output when the second connection signal is interrupted.

[0099] It can be understood that the second connection signal can be a group of signals, including at least a wake-up signal, and when any signal in the second connection signal is disconnected, it is regarded as the second connection signal is interrupted.

[0100] This embodiment realizes that the power management system or chip actively interacts with the charger 40 during the charging process, reduces the control of people and the host computer, and adjusts the charging current according to the battery status to ensure convenient, fast, safe and reliable charging.

[0101] Figure 3 This is a flow chart of the first embodiment of the method for charging a battery pack for battery replacement according to the present invention.

[0102] refer to Figure 3 , the battery pack charging method is applied to the battery pack charging system according to any one of claims 1 to 8, the battery pack charging system comprising: a battery module, a battery interface circuit, a charger and a charging interface circuit; wherein the battery pack interface circuit is connected to the battery module, the charging interface circuit is connected to the charger, the battery module comprises a battery pack, a controller and a high-voltage relay connected in sequence, the control end of the high-voltage relay is connected to the controller, and the controlled end of the high-voltage relay is connected to the battery pack and the battery interface circuit;

[0103] The battery pack charging method includes:

[0104] Step S10: When the charging interface circuit is connected to the battery interface circuit, the charging interface circuit outputs a first connection signal to the controller.

[0105] It should be noted that the charging interface circuit can be encapsulated in a charger socket. When the charging interface circuit is connected to the battery interface circuit, the controller in the battery module can detect a number of level signals. At this time, the number of level signals detected by the controller are the first connection signals.

[0106] Step S20: When the battery interface circuit is connected to the charging interface circuit, the battery interface circuit outputs a second connection signal to the charger.

[0107] It is understandable that the charger may include a processor, which can compare and process the received signals.

[0108] It should be noted that the battery interface circuit can be encapsulated in a charger socket. When the battery interface circuit is connected to the charging interface circuit, the charger can also detect a number of level signals. At this time, the number of level signals detected by the charger are the second connection signals.

[0109] Step S30: When the current mode logic voltage is in an available range, the controller closes the high-voltage relay according to the first connection signal and the second connection signal, so that the charger outputs a DC power supply to the battery pack through the charging interface circuit and the battery interface circuit, thereby charging the battery pack.

[0110] It can be understood that the controller can be a battery management chip or system for the vehicle, which can detect the current mode logic voltage, which is a differential logic level used to determine whether the communication is normal. In a specific implementation, when the devices at both ends of the relevant circuit use the same power supply, DC coupling can be used, and no devices need to be added. When the devices at both ends of the transmitter and receiver use different power supplies, AC coupling should generally be considered.

[0111] It should be understood that only when the current mode logic voltage is normal, the charger determines that the battery pack plug is connected, and the controller determines that the battery module is connected to the charger socket normally, will the high-voltage relay be closed to connect the charging circuit, so that the charger can output the DC power to the battery pack to charge the battery pack.

[0112] Step S40: When a fault condition or a full charge condition is met, the controller disconnects the high-voltage relay to stop charging the battery pack.

[0113] In this embodiment, the fault condition is judged according to the GB27930 standard, which may include a charger failure and a battery pack failure. Since this embodiment can be applied to charging battery packs of various electric vehicles, this embodiment does not limit the specific fault condition indicators.

[0114] Since the present battery pack charging method adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0115] In addition, to achieve the above-mentioned purpose, the present invention also proposes an electric vehicle, which includes the battery replacement battery pack charging system as described above.

[0116] Since the electric vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0117] It should be understood that the above is only an example and does not constitute any limitation on the technical solution of the present invention. In specific applications, technicians in this field can make settings as needed, and the present invention does not limit this.

[0118] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of them according to actual needs to achieve the purpose of the present embodiment, and no limitation is made here.

[0119] In addition, for technical details that are not described in detail in this embodiment, please refer to the battery replacement battery pack charging system provided in any embodiment of the present invention, and will not be repeated here.

[0120] In addition, it should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0121] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0122] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0123] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery pack charging system, characterized in that: The battery pack charging system includes: a battery module, a battery interface circuit, a charger and a charging interface circuit; wherein the battery interface circuit is connected to the battery module, the charging interface circuit is connected to the charger, the battery module includes a battery pack, a controller and a high-voltage relay connected in sequence, the control end of the high-voltage relay is connected to the controller, and the controlled end of the high-voltage relay is connected to the battery pack and the battery interface circuit; The charging interface circuit is used to output a first connection signal to the controller when connected to the battery interface circuit; The battery interface circuit is used to output a second connection signal to the charger when connected to the charging interface circuit; The controller is configured to close the high-voltage relay according to the first connection signal and the second connection signal when the current mode logic voltage is within an available range, so that the charger outputs a DC power supply to the battery pack through the charging interface circuit and the battery interface circuit, thereby charging the battery pack; The controller is further configured to disconnect the high-voltage relay when a fault condition or a full-charge condition is met, thereby stopping charging the battery pack; The charging interface circuit includes first to fifteenth interfaces; The battery interface circuit includes sixteenth to thirtieth interfaces, the sixteenth and seventeenth interfaces are respectively connected to the controller, the eighteenth interface is grounded, the nineteenth to twenty-eighth interfaces are respectively connected to the controller, and the twenty-ninth and thirtieth interfaces are respectively connected to the battery pack; When the charging interface circuit is connected to the battery interface circuit, the first to fifteenth interfaces are connected to the sixteenth to thirtieth interfaces in a one-to-one correspondence; The charging interface circuit comprises: first to fifth resistors, a first switch and a second switch, wherein the first resistor is connected in series between the first interface and the second interface, the first end of the second resistor is connected to the third interface, the second end of the second resistor is connected to the first end of the first switch, the second end of the first switch is connected to the detection end of the charger, the first end of the third resistor is connected to the first end of the second resistor, the second end of the third resistor is connected to the second end of the first switch, the first end of the fourth resistor is connected to the second end of the first switch, and the second end of the fourth resistor is connected to the voltage-stabilized power supply; The fourth interface and the fifth interface are respectively connected to the communication interface of the charger; The sixth interface and the seventh interface are connected in series and then connected to the positive output terminal of the low-voltage power supply of the charger, the first end of the second switch is connected to the eighth interface, and the second end of the second switch is connected to the node between the sixth interface and the seventh interface; The ninth interface is grounded, the tenth interface is connected to the ninth interface, the tenth interface is also connected to the negative output terminal of the low-voltage power supply of the charger, and the eleventh interface is connected to the tenth interface through the fifth resistor; The twelfth and thirteenth interfaces are vacant; The fourteenth interface and the fifteenth interface are respectively connected to the negative output terminal of the high-voltage power supply and the positive output terminal of the high-voltage power supply of the charger.

2. The battery pack charging system according to claim 1, characterized in that: The charging interface circuit is further configured to output a wake-up signal to the controller when connected to the battery interface circuit; The controller is configured to operate when the wake-up signal is detected, and to be in standby mode when the wake-up signal is not detected.

3. The battery pack charging system according to claim 1, characterized in that: The first switch is used to disconnect when the third interface is connected to the eighteenth interface, thereby outputting a second connection signal to the charger.

4. The battery pack charging system according to claim 1, characterized in that: The charger is used to output a charging voltage to the battery pack through the fourteenth interface, the fifteenth interface, the twenty-ninth interface and the thirtieth interface when the high-voltage relay is closed, so as to charge the battery pack; The charger is further configured to output a communication signal to the controller when the fourth interface and the fifth interface are connected to the nineteenth interface and the twentieth interface respectively; The controller is further used to detect the charging current according to the communication signal, and when the charging current meets the fault condition, disconnect the high-voltage relay to stop charging the battery pack.

5. The battery pack charging system according to claim 1, characterized in that: The controller is further configured to send a stop signal to the charger when a full charging condition is met; The charger is further configured to disconnect the second switch according to the shutdown signal, thereby cutting off the wake-up signal.

6. The battery pack charging system according to any one of claims 1 to 5, characterized in that: The charger is used to shut down the DC power output when the second connection signal is interrupted.

7. A method for charging a battery pack for battery replacement, characterized in that: The battery-swap battery pack charging method is applied to a battery-swap battery pack charging system as described in any one of claims 1 to 6, and the battery-swap battery pack charging system comprises: a battery module, a battery interface circuit, a charger and a charging interface circuit; wherein the battery pack interface circuit is connected to the battery module, the charging interface circuit is connected to the charger, the battery module comprises a battery pack, a controller and a high-voltage relay connected in sequence, the control end of the high-voltage relay is connected to the controller, and the controlled end of the high-voltage relay is connected to the battery pack and the battery interface circuit; The charging interface circuit includes first to fifteenth interfaces; The battery interface circuit includes sixteenth to thirtieth interfaces, the sixteenth and seventeenth interfaces are respectively connected to the controller, the eighteenth interface is grounded, the nineteenth to twenty-eighth interfaces are respectively connected to the controller, and the twenty-ninth and thirtieth interfaces are respectively connected to the battery pack; When the charging interface circuit is connected to the battery interface circuit, the first to fifteenth interfaces are connected to the sixteenth to thirtieth interfaces in a one-to-one correspondence; The charging interface circuit comprises: first to fifth resistors, a first switch and a second switch, wherein the first resistor is connected in series between the first interface and the second interface, the first end of the second resistor is connected to the third interface, the second end of the second resistor is connected to the first end of the first switch, the second end of the first switch is connected to the detection end of the charger, the first end of the third resistor is connected to the first end of the second resistor, the second end of the third resistor is connected to the second end of the first switch, the first end of the fourth resistor is connected to the second end of the first switch, and the second end of the fourth resistor is connected to the voltage-stabilized power supply; The fourth interface and the fifth interface are respectively connected to the communication interface of the charger; The sixth interface and the seventh interface are connected in series and then connected to the positive output terminal of the low-voltage power supply of the charger, the first end of the second switch is connected to the eighth interface, and the second end of the second switch is connected to the node between the sixth interface and the seventh interface; The ninth interface is grounded, the tenth interface is connected to the ninth interface, the tenth interface is also connected to the negative output terminal of the low-voltage power supply of the charger, and the eleventh interface is connected to the tenth interface through the fifth resistor; The twelfth and thirteenth interfaces are vacant; The fourteenth interface and the fifteenth interface are respectively connected to the negative output terminal of the high-voltage power supply and the positive output terminal of the high-voltage power supply of the charger; The battery pack charging method includes: When the charging interface circuit is connected to the battery interface circuit, the charging interface circuit outputs a first connection signal to the controller; When the battery interface circuit is connected to the charging interface circuit, the battery interface circuit outputs a second connection signal to the charger; When the current mode logic voltage is within the available range, the controller closes the high-voltage relay according to the first connection signal and the second connection signal, so that the charger outputs a DC power supply to the battery pack through the charging interface circuit and the battery interface circuit, thereby charging the battery pack; When a fault condition or a full charge condition is met, the controller disconnects the high-voltage relay, thereby stopping charging the battery pack.

8. An electric vehicle, characterized in that: The electric vehicle includes a battery-swap battery pack charging system as described in any one of claims 1 to 6.

Images