Range-extending battery system of pure electric logistics vehicle

Abstract

The utility model discloses a range extending battery system of a pure electric logistics vehicle in the field of energy storage systems of electric vehicles, which comprises a control unit, and further comprises a power-up battery pack unit, an original vehicle power battery unit, an independent refrigerating system and a Tbox which are electrically connected with the control unit. When a vehicle is parked and charged, the range-extended battery system synchronously charges the vehicle; when the vehicle runs, the vehicle runs in two modes, namely a range extending mode and an independent power supply mode. In the range extending mode, the range extending battery system supplies power to the whole vehicle; in the independent power supply mode, the range extending battery system (the power-up battery pack unit) only supplies power to the independent refrigeration system. According to the utility model, besides the original vehicle refrigeration system, the independent refrigeration system is additionally arranged, and when one set of refrigeration system fails, the other set of refrigeration system can work independently, so as to ensure that articles are transported and stored at a specified temperature.

Description

Technical Field

[0001] The utility model relates to the field of energy storage systems for electric vehicles, and in particular to a range-extending battery system for pure electric logistics vehicles. Background Art

[0002] In order to alleviate users' "range anxiety", existing pure electric logistics vehicle manufacturers usually use various means to increase the range, including reducing the vehicle's driving energy consumption, increasing the power of the power battery pack, etc. Even so, in actual application scenarios, users usually still hope that pure electric logistics vehicles have a longer range based on the existing range to meet actual operational needs and alleviate range anxiety; and this range anxiety is particularly prominent in pure electric refrigerated logistics vehicles: because pure electric refrigerated logistics vehicles, in addition to the power consumption of the vehicle's driving, the refrigeration machine also consumes some electricity, which makes the vehicle's range shorter.

[0003] Traditional refrigerated logistics vehicles only have one refrigeration system. However, when this refrigeration system malfunctions, the entire refrigerated logistics vehicle loses its original efficiency, causing the temperature inside the vehicle to rise, which is not conducive to the storage and transportation of goods. Especially in the pharmaceutical cold chain transportation scenario, two independent refrigeration systems are required. When one refrigeration system fails, the other refrigeration system can still work independently to ensure that the medicines are transported and stored at the specified temperature.

[0004] Therefore, those skilled in the art provide a range-extending battery system for a pure electric logistics vehicle to solve the problems raised in the above background technology. Utility Model Content

[0005] The purpose of the present invention is to provide a range-extending battery system for a pure electric logistics vehicle to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A range-extending battery system for a pure electric logistics vehicle includes a control unit, a powered battery pack unit electrically connected to the control unit, an original vehicle power battery unit, an independent cooling system, and a Tbox;

[0008] The control unit includes a main control board and a bidirectional DCDC converter electrically connected to the main control board. The positive pole on one side of the bidirectional DCDC converter is connected to the positive relay and the independent cooling system power supply relay through a fuse. The independent cooling system power supply relay is connected to the independent cooling system power supply connector through the independent cooling system power supply fuse. The negative pole on the same side of the bidirectional DCDC converter is connected to the negative relay and the independent cooling system power supply connector. The independent cooling system power supply connector is connected to the independent cooling system. The other side of the bidirectional DCDC converter is connected to the high-voltage connector of the powered battery pack unit.

[0009] The powered battery pack unit includes a battery cell and a powered battery pack unit high-voltage output connector. The positive pole of the battery cell is connected to a manual maintenance switch. The output end of the manual maintenance switch is electrically connected to the powered battery pack unit high-voltage output connector and one end of the heating film relay, respectively. The other end of the heating film relay is connected to one end of the heating film through the heating film fuse. The negative pole of the battery cell is electrically connected to a main fuse. The other side of the main fuse is connected to one end of the main negative relay. The other end of the main negative relay and the other end of the heating film are electrically connected to the powered battery pack unit high-voltage output connector. The powered battery pack unit high-voltage output connector is connected to the powered battery pack unit high-voltage connector.

[0010] The original vehicle power battery unit includes at least a high-voltage output connector and an external communication connector; the high-voltage output connector is electrically connected to the original vehicle power battery unit connector provided on the control unit, and the external communication connector is connected to the CAN communication between the Tbox and the original vehicle;

[0011] The Tbox includes low-voltage communication interface 1 and low-voltage communication interface 2. The main control board is connected to the low-voltage communication interface 1 through the external communication connector set on the control unit, and then conducts CAN communication with the Tbox. The other CAN communication interface of the Tbox is connected to the CAN communication of the original vehicle through the low-voltage communication interface 2.

[0012] Among them, the powered battery pack unit also includes a slave control board, which is electrically connected to a low-voltage connector. The main control board is connected to the low-voltage connector through the powered battery pack unit low-voltage connector set on the control unit, and then connected to the slave control board for CAN communication.

[0013] Among them, CAN communication connection is established between the main control board and the bidirectional DCDC converter, and the positive relay and negative relay output ends are connected to the high-voltage positive and negative poles of the original vehicle power battery unit output ends through the original vehicle power battery unit connector and high-voltage output connector set on the control unit.

[0014] Among them, it also includes the original vehicle power distribution unit, which includes a fast charging high-voltage connector, a fast charging fuse and a fast charging positive relay that are electrically connected in sequence. The fast charging high-voltage connector is connected to a fast charging socket. The fast charging high-voltage connector is connected to the original vehicle power distribution unit high-voltage connector after passing through the fast charging fuse and the fast charging positive relay. The original vehicle power distribution unit high-voltage connector is electrically connected to the high-voltage output connector of the original vehicle power battery unit after passing through the power distribution unit high-voltage connector and the original vehicle power battery unit connector set on the control unit.

[0015] Among them, it also includes the original vehicle refrigeration system electrically connected to the original vehicle power distribution unit. The original vehicle power distribution unit is provided with the original vehicle refrigeration system high-voltage connector connected to the original vehicle refrigeration system. The original vehicle power distribution unit also includes the original vehicle refrigeration system power supply fuse, pre-charging resistor, original vehicle refrigeration system pre-charging relay and original vehicle refrigeration system power supply relay. The original vehicle refrigeration system pre-charging relay is connected in series with the pre-charging resistor and then connected in parallel with the original vehicle refrigeration system power supply relay. Then one end is electrically connected to the original vehicle power battery unit together with the fast charging positive relay, and the other end is connected to the original vehicle refrigeration system through the original vehicle refrigeration system power supply fuse and the original vehicle refrigeration system high-voltage connector.

[0016] This utility model can effectively alleviate the "range anxiety" of existing pure electric logistics vehicle users, supplement the power consumption of refrigeration machines in pure electric refrigerated logistics vehicles, and fill the gap in the demand for independent refrigeration machines in pharmaceutical cold chain transportation scenarios. The range-extending battery system is charged synchronously when the vehicle is parked for charging; when the vehicle is driving, it operates in two modes, one is the range-extending mode and the other is the independent power supply mode. In the range-extending mode, the range-extending battery system supplies power to the entire vehicle; in the independent power supply mode, the range-extending battery system (plus the battery pack unit) only supplies power to the independent refrigeration system.

[0017] In addition to the original vehicle refrigeration system, the utility model also adds an independent refrigeration system. When one of the refrigeration systems fails, the other refrigeration system can still work independently, thereby ensuring that items (such as medicines) are transported and stored at the specified temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the circuit structure of the utility model;

[0019] Figure 2 This is an enlarged circuit diagram of the control unit in the utility model.

[0020] Figure 3 This is an enlarged circuit diagram of the charging battery pack unit in the present invention;

[0021] Figure 4 This is an enlarged circuit diagram of the power distribution unit of the Zhongyuan vehicle in the utility model;

[0022] In the figure: 1. Control unit; 101. Bidirectional DCDC converter; 102. Fuse; 103. Negative relay; 104. Positive relay; 105. Independent cooling system power supply relay; 106. Independent cooling system power supply fuse; 107. Independent cooling system power supply connector; 108. Powered battery pack unit high voltage connector; 109. Power distribution unit high voltage connector; 110. Original vehicle power battery unit connector; 111. External communication connector; 112. Main control board; 113. Powered battery pack unit low voltage connector; 2. Powered battery pack unit; 201. Heating film fuse; 202. Heating film; 203. Heating film relay; 204. Manual maintenance switch; 205. Main fuse; 206. Main negative relay; 207. Powered Battery pack unit high-voltage output connector; 208, slave control board; 209, low-voltage connector; 210, battery cell; 3, original vehicle power distribution unit; 301, original vehicle refrigeration system power supply fuse; 302, pre-charge resistor; 303, original vehicle refrigeration system pre-charge relay; 304, original vehicle refrigeration system power supply relay; 305, fast charge positive relay; 306, fast charge fuse; 307, fast charge high-voltage connector; 308, original vehicle refrigeration system high-voltage connector; 309, original vehicle power distribution unit high-voltage connector; 4, original vehicle power battery unit; 401, high-voltage output connector; 402, external communication connector; 5, independent refrigeration system; 6, Tbox; 601, low-voltage communication interface 1; 602, low-voltage communication interface 2; 7, fast charge socket; 8, original vehicle refrigeration system. DETAILED DESCRIPTION

[0023] See also Figures 1 to 4 , a range-extending battery system for a pure electric logistics vehicle, comprising a control unit 1, a powered battery pack unit 2 electrically connected to the control unit 1, an original vehicle power battery unit 4, an independent refrigeration system 5, and a Tbox 6;

[0024] The control unit 1 includes a main control board 112 and a bidirectional DC-DC converter 101 electrically connected to the main control board 112. The positive pole on one side of the bidirectional DC-DC converter 101 is connected to a positive relay 104 and an independent cooling system power supply relay 105 via a fuse 102. The independent cooling system power supply relay 105 is connected to an independent cooling system power supply connector 107 via an independent cooling system power supply fuse 106. The negative pole on the same side of the bidirectional DC-DC converter 101 is connected to a negative relay 103 and an independent cooling system power supply connector 107. The independent cooling system power supply connector 107 is connected to the independent cooling system 5. The other side of the bidirectional DC-DC converter 101 is connected to a high-voltage connector 108 for a powered battery pack unit.

[0025] The powered battery pack unit 2 includes a battery cell 210 and a powered battery pack unit high voltage output connector 207. The battery cell 210 can be a battery cell group formed by multiple battery cells connected in series. The positive electrode of the battery cell 210 is connected to a manual maintenance switch 204, and the current is output through the other side of the manual maintenance switch 204. The output end of the manual maintenance switch 204 is electrically connected to the powered battery pack unit high voltage output connector 207 and one end of the heating film relay 203. The battery cell 210 is output to the powered battery pack unit high voltage output connector 207 through the manual maintenance switch 204, and the other end of the heating film relay 203 is connected to the heating film relay 203 through the heating film relay 203. The fuse 201 is connected to one end of the heating film 202, and power is supplied to the heating film 202 through the heating film fuse 201 to heat the battery cell 210; the negative pole of the battery cell 210 is electrically connected to the main fuse 205, and the other side of the main fuse 205 is connected to one end of the main negative relay 206. The other end of the main negative relay 206 and the other end of the heating film 202 are electrically connected to the high-voltage output connector 207 of the powered battery pack unit. The high-voltage output connector 207 of the powered battery pack unit is connected to the high-voltage connector 108 of the powered battery pack unit, thereby enabling the control unit 1 to draw power from the powered battery pack unit 2;

[0026] The original vehicle power battery unit 4 at least includes a high-voltage output connector 401 and an external communication connector 402; the high-voltage output connector 401 is electrically connected to the original vehicle power battery unit connector 110 provided on the control unit 1, and the external communication connector 402 is connected to the CAN communication between the Tbox 6 and the original vehicle;

[0027] Tbox6 can include multiple low-voltage communication interfaces. In this embodiment, Tbox6 includes a low-voltage communication interface 1 601 and a low-voltage communication interface 2 602. The main control board 112 is connected to the low-voltage communication interface 1 601 through the external communication connector 111 set on the control unit 1, and then performs CAN communication with Tbox6. The main control board 112 performs CAN communication with Tbox6 through the external communication connector 111, and sends the voltage and collected temperature of each battery cell to Tbox6 and uploads them to the cloud platform through Tbox6 for external monitoring. Another CAN communication interface of Tbox6 is connected to the CAN communication of the original vehicle through the low-voltage communication interface 2 602, and is connected to the power battery unit 4 of the original vehicle for CAN communication to obtain the vehicle status of the original vehicle.

[0028] Among them, the powered battery pack unit 2 also includes a slave control board 208, which samples the voltage of each battery cell 210 in series, monitors the single cell voltage of each battery cell in real time, and collects the temperature of the battery cell, and sends it to the main control board 112 through CAN communication. The slave control board 208 is electrically connected to the low-voltage connector 209. The main control board 112 is connected to the low-voltage connector 209 through the powered battery pack unit low-voltage connector 113 set on the control unit 1, and then connected to the slave control board 208 for CAN communication. The main control board 112 obtains the battery cell voltage, temperature, and SOC information of the powered battery pack unit 2, and controls the on and off of the main negative relay 206 through the slave control board 208.

[0029] Among them, the main control board 112 is connected to the bidirectional DCDC converter 101 via CAN communication, sending control instructions to the bidirectional DCDC converter 101 and receiving working information of the bidirectional DCDC converter 101; the output ends of the positive relay 104 and the negative relay 103 are connected to the high-voltage positive and negative poles of the output ends of the original vehicle power battery unit 4 through the original vehicle power battery unit connector 110 and the high-voltage output connector 401 set on the control unit 1.

[0030] Among them, it also includes the original vehicle power distribution unit 3, which includes a fast charging high-voltage connector 307, a fast charging fuse 306 and a fast charging positive relay 305 that are electrically connected in sequence. The fast charging high-voltage connector 307 is connected to the fast charging socket 7. The fast charging high-voltage connector 307 is connected to the original vehicle power distribution unit 3 through the fast charging fuse 306 and the fast charging positive relay 305. The original vehicle power distribution unit high-voltage connector 309 is electrically connected to the high-voltage output connector 401 of the original vehicle power battery unit 4 through the distribution unit high-voltage connector 109 and the original vehicle power battery unit connector 110 set on the control unit 1, so as to realize charging of the original vehicle power battery unit 4.

[0031] Among them, it also includes an original vehicle refrigeration system 8 electrically connected to the original vehicle power distribution unit 3, and the original vehicle power distribution unit 3 is provided with an original vehicle refrigeration system high-voltage connector 308 connected to the original vehicle refrigeration system 8. The original vehicle power distribution unit 3 also includes an original vehicle refrigeration system power supply fuse 301, a pre-charging resistor 302, an original vehicle refrigeration system pre-charging relay 303 and an original vehicle refrigeration system power supply relay 304. The original vehicle refrigeration system pre-charging relay 303 is connected in series with the pre-charging resistor 302 and then connected in parallel with the original vehicle refrigeration system power supply relay 304. Then one end is electrically connected to the original vehicle power battery unit 4 together with the fast charging positive relay 305, and the other end is connected to the original vehicle refrigeration system 8 through the original vehicle refrigeration system power supply fuse 301 and the original vehicle refrigeration system high-voltage connector 308.

[0032] The working principle of this utility model is:

[0033] 1. Working principle of the range-extended battery system when the vehicle is parked and charging

[0034] When the vehicle is parked for charging, the external charging station charges the vehicle through the fast charging socket 7, and the original vehicle power battery unit 4 is charged through the fast charging fuse 306, the fast charging positive relay 305, the original vehicle power distribution unit high-voltage connector 309, the distribution unit high-voltage connector 109, the original vehicle power battery unit connector 110, and the high-voltage output connector 401. At the same time, it is connected to the bidirectional DCDC converter 101 through the positive relay 104, the fuse 102, and the negative relay 103. Tbox 6 obtains parking charging information from the original vehicle's CAN communication and forwards the information to the main control board 112. The main control board 112 controls the bidirectional DCDC converter 101 to start the buck mode, stepping down the voltage obtained from the charging station to charge the powered battery pack unit 2. At the same time, the main control board 112 sends a start command to the slave control board 208, which controls the main negative relay 206 to attract, and the powered battery pack unit 2 enters the charging state.

[0035] 2. Working Principle of the Range Extender Battery System in Range Extender Mode

[0036] When the vehicle is started, Tbox6 obtains vehicle startup information from the original vehicle's CAN communication and forwards this information to main control board 112. Main control board 112 sends a startup command to slave control board 208, which controls main negative relay 206 to close, causing the powered battery pack unit 2 to enter a discharge state. Simultaneously, main control board 112 controls bidirectional DCDC converter 101 to activate boost mode, boosting the voltage of powered battery pack unit 2 and providing electrical energy to the entire vehicle through fuse 102, positive relay 104, and negative relay 103. When braking energy recovery is performed while the vehicle is in motion, Tbox6 obtains braking energy recovery information from the original vehicle's CAN communication and forwards this information to main control board 112. Main control board 112 controls bidirectional DCDC converter 101 to temporarily shut down until braking energy recovery is terminated, at which point main control board 112 controls bidirectional DCDC converter 101 to re-enable the boost function.

[0037] 3. Working principle of the extended-range battery system in independent power supply mode

[0038] When the independent cooling system 5 is installed, Tbox 6 receives the independent cooling system startup command from the original vehicle's CAN communication and forwards the command to main control board 112. Main control board 112 sends the startup command to slave control board 208, which controls the main negative relay 206 to be energized, and the powered battery pack unit 2 enters the discharge state. At the same time, main control board 112 controls bidirectional DCDC converter 101 to enter the boost mode, boosting the voltage of the powered battery pack unit 2 and supplying power to the independent cooling system 5 through fuse 102, independent cooling system power supply relay 105, and independent cooling system power supply fuse 106. Independent cooling system 5 starts working. At this time, positive relay 104 and negative relay 103 are disconnected, thereby realizing the independent power supply mode of the extended-range battery system to the independent cooling system 5.

[0039] In this embodiment, the range-extended battery system charges while the vehicle is parked. While the vehicle is in motion, it operates in two modes: range-extended mode and independent power supply mode. In range-extended mode, the range-extended battery system powers the entire vehicle; in independent power supply mode, it only powers the independent refrigeration system. If one refrigeration system fails, the other can continue to operate independently, ensuring that medicines are transported and stored at the specified temperature.

[0040] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A range-extending battery system for a pure electric logistics vehicle, comprising a control unit (1), characterized in that: It also includes a powered battery pack unit (2) electrically connected to the control unit (1), an original vehicle power battery unit (4), an independent cooling system (5) and a Tbox (6); The control unit (1) comprises a main control board (112) and a bidirectional DCDC converter (101) electrically connected to the main control board (112); the positive pole on one side of the bidirectional DCDC converter (101) is connected to a positive relay (104) and an independent refrigeration system power supply relay (105) respectively through a fuse (102); the independent refrigeration system power supply relay (105) is connected to an independent refrigeration system power supply connector (107) through an independent refrigeration system power supply fuse (106); the negative pole on the same side of the bidirectional DCDC converter (101) is connected to a negative relay (103) and an independent refrigeration system power supply connector (107) respectively; the independent refrigeration system power supply connector (107) is connected to an independent refrigeration system (5); and the other side of the bidirectional DCDC converter (101) is connected to a powered battery pack unit high voltage connector (108); The electrified battery pack unit (2) comprises a battery cell (210) and an electrified battery pack unit high-voltage output connector (207); the positive pole of the battery cell (210) is connected to a manual maintenance switch (204); the output end of the manual maintenance switch (204) is electrically connected to the electrified battery pack unit high-voltage output connector (207) and one end of the heating film relay (203), respectively; the other end of the heating film relay (203) is connected to one end of the heating film (202) after passing through the heating film fuse (201); the negative pole of the battery cell (210) is electrically connected to a main fuse (205); the other side of the main fuse (205) is connected to one end of a main negative relay (206); the other end of the main negative relay (206) and the other end of the heating film (202) are electrically connected to the electrified battery pack unit high-voltage output connector (207); the electrified battery pack unit high-voltage output connector (207) is connected to the electrified battery pack unit high-voltage connector (108); The original vehicle power battery unit (4) comprises at least a high-voltage output connector (401) and an external communication connector (402); the high-voltage output connector (401) is electrically connected to the original vehicle power battery unit connector (110) provided on the control unit (1), and the external communication connector (402) is connected to the Tbox (6) and the original vehicle CAN communication; The Tbox (6) includes a low-voltage communication interface 1 (601) and a low-voltage communication interface 2 (602). The main control board (112) is connected to the low-voltage communication interface 1 (601) via an external communication connector (111) provided on the control unit (1), and then performs CAN communication with the Tbox (6). Another CAN communication interface of the Tbox (6) is connected to the CAN communication of the original vehicle via the low-voltage communication interface 2 (602).

2. The range-extending battery system for a pure electric logistics vehicle according to claim 1, characterized in that: The powered battery pack unit (2) further includes a slave control board (208), the slave control board (208) being electrically connected to a low-voltage connector (209), and the main control board (112) being connected to the low-voltage connector (209) via a powered battery pack unit low-voltage connector (113) provided on the control unit (1), thereby establishing a CAN communication connection with the slave control board (208).

3. The range-extending battery system for a pure electric logistics vehicle according to claim 1, characterized in that: The main control board (112) is connected to the bidirectional DCDC converter (101) via CAN communication, and the output ends of the positive relay (104) and the negative relay (103) are connected to the high-voltage positive and negative electrodes of the output end of the original vehicle power battery unit (4) via the original vehicle power battery unit connector (110) and the high-voltage output connector (401) provided on the control unit (1).

4. The range-extending battery system for a pure electric logistics vehicle according to claim 1, characterized in that: The invention also includes an original vehicle power distribution unit (3), wherein the original vehicle power distribution unit (3) includes a fast-charging high-voltage connector (307), a fast-charging fuse (306) and a fast-charging positive relay (305) which are electrically connected in sequence. The fast-charging high-voltage connector (307) is connected to a fast-charging socket (7). The fast-charging high-voltage connector (307) is connected to an original vehicle power distribution unit high-voltage connector (309) of the original vehicle power distribution unit (3) via the fast-charging fuse (306) and the fast-charging positive relay (305). The original vehicle power distribution unit high-voltage connector (309) is electrically connected to a high-voltage output connector (401) of the original vehicle power battery unit (4) via a power distribution unit high-voltage connector (109) provided on the control unit (1) and an original vehicle power battery unit connector (110).

5. The range-extending battery system for a pure electric logistics vehicle according to claim 4, characterized in that: The invention also includes an original vehicle refrigeration system (8) electrically connected to the original vehicle power distribution unit (3). The original vehicle power distribution unit (3) is provided with an original vehicle refrigeration system high-voltage connector (308) connected to the original vehicle refrigeration system (8). The original vehicle power distribution unit (3) also includes an original vehicle refrigeration system power supply fuse (301), a pre-charge resistor (302), an original vehicle refrigeration system pre-charge relay (303) and an original vehicle refrigeration system power supply relay (304). The original vehicle refrigeration system pre-charge relay (303) is connected in series with the pre-charge resistor (302) and then connected in parallel with the original vehicle refrigeration system power supply relay (304). Then, one end is electrically connected to the original vehicle power battery unit (4) together with the fast charge positive relay (305), and the other end is connected to the original vehicle refrigeration system (8) through the original vehicle refrigeration system power supply fuse (301) and the original vehicle refrigeration system high-voltage connector (308).

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