Mobile type charge-discharge energy storage vehicle

Abstract

The utility model discloses a mobile type fills and charges energy storage vehicle, including trailer head, trailer chassis and battery container equipment, trailer head links to trailer chassis, and battery container equipment is installed on trailer chassis. Battery container equipment includes container main part, and the container main part is cuboid structure, and one end of container main part is equipped with exhaust fan and liquid cooling machine, and the other end of container main part is equipped with charge -discharge pilot lamp, air conditioner and quick connector from top to bottom. The side of container main part is equipped with pressure -relief valve, operation box, first air inlet louver, fire water connection and first grounding, and the other side of container main part is equipped with fire operation box, cable interface, second grounding and second air inlet louver, and pressure -relief valve is the pressure relief of container main part inside, and first air inlet louver and second air inlet louver provide the air intake of container main part inside, and cable interface connects container main part inside equipment, and first grounding and second grounding are the grounding of container main part inside equipment.

Description

Technical Field

[0001] This utility model belongs to the field of new energy storage technology, specifically relating to a mobile charging and discharging energy storage vehicle. Background Technology

[0002] Existing energy storage power stations are often placed on the ground in relatively fixed locations. This results in inflexible deployment, long construction periods, limited applicability, and an inability to quickly respond to temporary or remote power needs. Traditional emergency power vehicles have limited functionality, only capable of discharging electricity, and their power output is insufficient to meet high-power demand scenarios (such as oil extraction and emergency power supply). Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a mobile charging and discharging energy storage vehicle that is flexible in deployment and can be quickly moved to areas requiring electricity through a towable design.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a mobile charging and discharging energy storage vehicle, including a trailer head, a trailer chassis, and a battery container equipment. The trailer head is connected to the trailer chassis, and the battery container equipment is installed on the trailer chassis. The battery container equipment includes a container body, which is a cuboid structure. One end of the container body is equipped with an exhaust fan and a liquid cooler. The other end of the container body is equipped with a charging and discharging indicator light, an air conditioner, and a quick-connect port from top to bottom. The exhaust fan is used for ventilation inside the container body, the liquid cooler is used for cooling inside the container body, and the air conditioner is used to maintain a constant temperature inside the container body. The side of the container body is equipped with a pressure relief valve, an operation box, a first air inlet louver, a fire water interface, and a first grounding port. The other side of the container body is equipped with a fire control box, a cable interface, a second grounding port, and a second air inlet louver. The pressure relief valve is used for depressurization inside the container body, the first and second air inlet louvers provide air intake to the inside of the container body, the cable interface connects to the internal equipment of the container body, and the first and second grounding ports are used for grounding the internal equipment of the container body.

[0005] Preferably, the container body has a first end door device and a second end door device at both ends. The first end door device includes a first end door body, a first door guide sleeve, a first door fixing sleeve, a first door rotating rod, and a first door rotating rod base. There are two first door rotating rod bases, which are arranged vertically on the container body. The first door guide sleeve and the first door rotating rod base are arranged in parallel. There are two first door guide sleeves, which are distributed vertically on the first end door body. The first door fixing sleeve is located between the two first door guide sleeves and on the first end door body. The first door rotating rod passes through the first door guide sleeve. The first door rotating rod has a first door rotating rod handle, which is perpendicular to the first door rotating rod. The two ends of the first door rotating rod correspond to the first door rotating rod base, and the end of the first door rotating rod handle is detachably connected to the first door fixing sleeve.

[0006] Preferably, the container end second door device includes a container end second door body, a second door guide sleeve, a second door fixing sleeve, a second door rotating rod, and a second door rotating rod base. The second door rotating rod is provided with a second door rotating rod handle. The length of the container end second door body is greater than that of the container end first door body. The second door guide sleeve has the same structure as the first door guide sleeve. The second door fixing sleeve has the same structure as the first door fixing sleeve. The second door rotating rod handle has the same structure as the first door rotating rod handle. The length of the second door rotating rod is greater than that of the first door rotating rod.

[0007] Preferably, the container body is provided with symmetrical container side door devices on both sides, and the structure of the container side door devices is the same as the structure of the second door device at the end of the container.

[0008] Preferably, the number of exhaust fans is two, and they are arranged in parallel at the upper end of the container body.

[0009] Preferably, the number of quick-connect ports is ten, with five quick-connect ports forming a quick-connect port group. Adjacent quick-connect ports within a quick-connect port group are arranged vertically at intervals, and the two quick-connect port groups are arranged symmetrically.

[0010] Preferably, there are two first grounding ports, which are distributed in parallel at both ends of the bottom of the container body. The structure of the second grounding port is the same as that of the first grounding port, and the first and second grounding ports are arranged symmetrically.

[0011] Preferably, the first air inlet louver is located at the bottom of the container body, and the structure of the second air inlet louver is the same as that of the first air inlet louver.

[0012] Preferably, there are two charging and discharging indicator lights, and a Beidou module is installed between the charging and discharging indicator lights.

[0013] The beneficial effects of this utility model are:

[0014] 1. The mobile charging and discharging energy storage vehicle provided by this utility model has a charging and discharging switching time of less than 100ms from charging at 90% rated power to discharging at 90% rated power, ensuring rapid response to various power demands.

[0015] 2. Power response speed of this utility model: In hot standby mode, the time from receiving the power dispatch command to responding with power output is <100ms, which meets the needs of high-power demand scenarios for rapid power supply.

[0016] 3. This utility model is a mobile, deployable, trailer-mounted high-power energy storage device. This device can flexibly cope with various scenarios and solve the shortcomings of traditional fixed energy storage power stations and emergency power vehicles. It plays an important role, especially in remote areas without grid coverage and in emergency scenarios. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of a mobile charging and discharging energy storage vehicle according to this utility model;

[0018] Figure 2 This is a top view of the structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the end face structure of the battery container equipment of this utility model;

[0020] Figure 4 This is a schematic diagram of the other end face of the battery container equipment of this utility model;

[0021] Figure 5 This is a side view of the battery container equipment of this utility model;

[0022] Figure 6 This is a schematic diagram of the other side of the battery container equipment of this utility model;

[0023] Figure 7 This is a schematic diagram of the internal structure of the container body of this utility model.

[0024] Figure 8 This is a schematic diagram of the structure of the combiner cabinet of this utility model;

[0025] Figure 9 This is a schematic diagram of the internal structure of the high-voltage box of this utility model;

[0026] Figure 10 This is a schematic diagram of the structure of the high-voltage box cover of this utility model;

[0027] Figure 11This is a schematic diagram of the internal planar structure of the high-voltage box of this utility model.

[0028] Explanation of reference numerals in the attached drawings: 1. Trailer cab; 2. Trailer chassis; 3. Battery container equipment; 30. Container body; 31. First door device at the end of the container; 32. Second door device at the end of the container; 33. Side door device of the container; 34. Beidou module; 35. Third door device at the end of the container; 36. Container mounting support; 37. Battery module; 38. High voltage box; 39. Combiner cabinet; 301. Exhaust fan; 302. Liquid cooler; 303. Charging / discharging... 304. Indicator light; 305. Air conditioner; 306. Quick-connect connector; 307. Pressure relief valve; 308. Control box; 309. First air inlet louver; 310. Fire water interface; 311. First grounding port; 312. Fire control box; 313. Cable interface; 314. Second grounding port; 315. Second air inlet louver; 316. Main body of the first door at the end of the container; 317. First door guide sleeve; 318. First door fixing sleeve; 319. First door rotating rod; 319. First door rotating rod base; 320. Second door body at the end of the container; 321. Second door guide sleeve; 322. Second door fixing sleeve; 323. Second door rotating rod; 324. Second door rotating rod base; 361. Container body mounting bracket; 3181. First door rotating rod handle; 3231. Second door rotating rod handle; 3801. Container bottom shell; 3802. High-voltage box top cover; 3803. Device mounting plate; 3804. Hall effect sensor. 3805. Board; 3806. Switching power supply; 3807. Switch insulating pad; 3808. Power resistor; 3809. Terminal; 3810. Switch; 3811. Contactor; 3812. DC contactor; 3813. Fan mounting plate; 3814. Fuse; 3815. Battery management module; 3816. Aluminum-zinc plate; 3817. Hall sensor; 3818. Fan; 3819. Power socket; 3820. Current socket; 3820. Handle. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0030] like Figures 1 to 11As shown, this utility model provides a mobile charging and discharging energy storage vehicle, including a trailer head 1, a trailer chassis 2, and a battery container equipment 3. The trailer head 1 is connected to the trailer chassis 2, and the battery container equipment 3 is installed on the trailer chassis 2. The battery container equipment 3 includes a container body 30, which is a cuboid structure. One end of the container body 30 is equipped with an exhaust fan 301 and a liquid cooler 302. The other end of the container body 30 is equipped with a charging and discharging indicator light 303, an air conditioner 304, and a quick-connect port 305 from top to bottom. The exhaust fan 301 is used for ventilation inside the container body 30, the liquid cooler 302 is used for cooling inside the container body 30, and the air conditioner 304 is used to maintain a constant temperature inside the container body 30. The container body 30 is equipped with a pressure relief valve 306, an operation box 307, a first air inlet louver 308, a fire water interface 309, and a first grounding port 310 on one side. The container body 30 is equipped with a fire control box 311, a cable interface 312, a second grounding port 313, and a second air inlet louver 314 on the other side. The pressure relief valve 306 relieves pressure inside the container body 30. The first air inlet louver 308 and the second air inlet louver 314 provide air intake to the inside of the container body 30. The cable interface 312 connects to the internal equipment of the container body 30. The first grounding port 310 and the second grounding port 313 ground the internal equipment of the container body 30.

[0031] The container body 30 has container mounting pillars 36 inside, and container mounting brackets 361 are mounted on the container body mounting pillars 36. The container body mounting brackets 361 are linearly distributed and symmetrically arranged on the container body mounting pillars 36. The container body mounting brackets 361 are horizontally placed in an "L" structure and are connected to the container body mounting pillars 36 by welding. Existing battery modules 37 are provided between adjacent container body mounting pillars 36. The battery modules 37 are existing power sources and are horizontally placed on the container body mounting brackets 361. In this embodiment, the battery modules 37 include an existing battery module with a mass of 1410 kg and a battery module with a mass of 2790 kg, and the two different battery modules are stacked on the container body mounting brackets 361. The container body 30 houses a high-voltage box 38 and a junction box 39. Nine battery modules 37 are connected to the high-voltage box 38 via cables, all converging into the junction box 39 to provide power to the outside. An exhaust fan 301, a liquid cooler 302, a charge / discharge indicator light 303, an air conditioner 304, a quick-connect port 305, and a cable interface 312 are electrically connected to the junction box 39. The junction box 39 provides power to the electrical equipment on the container body 30 and is a mature existing junction box system. The battery modules 37 are liquid-cooled modules. Their inlets and outlets are connected to a fire hydrant interface 309 via pipes, providing cooling liquid externally. The fire hydrant interface 309 has a fire inlet and a fire outlet. The inlet and outlet of the battery modules 37 are connected to the inlet and outlet of the liquid cooler 302, respectively, forming a liquid circulation system. In this example, fire water interface 309 is an existing, mature equipment interface.

[0032] In this embodiment, the combiner cabinet 39 is model TDCC-9-3. The series-connected battery module 37 is connected to the high-voltage box 38, and then the output terminal of the high-voltage box 38 is connected to the busbar in the combiner cabinet 39, and then connected to the output side.

[0033] The high-voltage box 38 includes a bottom shell 3801 and a top cover 3802, with the top cover 3802 located on the bottom shell 3801. Inside the bottom shell 3801 is a component mounting plate 3803, on which are mounted a Hall effect mounting plate 3804, a switching power supply 3805, a switch insulating pad 3806, a power resistor 3807, terminals 3808, a switch 3809, a contactor 3810, a DC contactor 3811, a fan mounting plate 3812, a fuse 3813, a battery management module 3814, and an aluminum-zinc plate 3815. A Hall effect sensor 3816 is mounted on the Hall effect mounting plate 3804, and a fan 3817 is mounted on the fan mounting plate 3812 for internal cooling. Switch 3809 is located on switch insulating pad 3806. The end face of the bottom shell 3801 of the enclosure is provided with a power socket 3818, a current socket 3819, and a handle 3820. The power socket 3818 is connected to a DC contactor 3811 via a copper busbar. A fuse 3813 is installed on the line connecting the power socket 3818 and the copper busbar. An insulator is also installed on the line connecting the fuse 3813 and the copper busbar. Switch 3809 is located on the wire connecting the switching power supply 3805 and the DC contactor 3811. Switch 3809 is used to control the internal current flow. In this embodiment, the battery management module 3814 is an existing device, model ESEMM-6412-F. The fuse 3813 and the Hall sensor 3816 are respectively electrically connected to the power resistor 3807 via two identical DC contactors 3811. The battery control module 3814 is electrically connected to contactor 3810.

[0034] Switch 3809 is electrically connected to DC contactor 3811 and switching power supply 3805 via copper busbars. The device mounting plate 3803 also has wire channels for organizing the wires connecting the relevant components. Current socket 3819 is electrically connected to switch 3809 via copper busbars. Both power socket 3818 and current socket 3819 are electrically connected to battery module 37. A sealing gasket with a rectangular structure is provided on the end face of the high-voltage box cover 3802. In this embodiment, the sealing gasket is made of foamed silicone.

[0035] In this embodiment, the battery module 37 is electrically connected to the high-voltage box 38. Specifically, the AC 220V switching power supply 3805 is a DC / DC switching power supply, and the positive and negative terminals of the battery module 37 are connected to the positive and negative terminals of the DC / DC switching power supply, respectively. The positive terminal of the DC / DC switching power supply is connected to the fuse 3813, and the fuse 3813 is also electrically connected to the battery management module 3814 through the power resistor 3807. The positive and negative terminals of the DC / DC switching power supply are connected to the battery control module 3814, respectively.

[0036] The DC / DC switching power supply is used to convert 220V AC power into 24V DC power for use inside the high-voltage box 38. Fuse 3813 detects overload and short circuit in the entire DC circuit. Once the load current or short circuit current exceeds the safety setting, it will immediately trip to protect and disconnect the entire circuit.

[0037] The battery control module 3814 collects and aggregates battery information from the battery module 37. After the high-voltage control box 38 is powered on, it controls the output of the contactor 3810. The control contactor 3810 is electrically connected to the combiner cabinet 39. In this embodiment, the power resistor 3807 is a pre-charge resistor.

[0038] The container body 30 has a first end door device 31 and a second end door device 32 at its two ends, respectively. The first end door device 31 includes a first end door body 315, a first door guide sleeve 316, a first door fixing sleeve 317, a first door rotating rod 318, and a first door rotating rod base 319. There are two first door rotating rod bases 319, which are arranged vertically on the container body 30. The first door guide sleeve 316 and the first door rotating rod base 319 are arranged in parallel. There are two first door guide sleeves 316, which are distributed vertically and parallel on the first end door body 315. The first door fixing sleeve 317 is located between the two first door guide sleeves 316 and on the first end door body 315. The first door rotating rod 318 passes through the first door guide sleeve 316. The first door rotating rod 318 is provided with a first door rotating rod handle 3181, which is perpendicular to the first door rotating rod 318. The two ends of the first door rotating rod 318 correspond to the first door rotating rod base 319, and the end of the first door rotating rod handle 3181 is detachably connected to the first door fixing sleeve 317.

[0039] In this embodiment, the first door guide sleeve 316 is a sheet metal cuboid structure with a bent, arched shape in the middle. The first door rotating rod 318 passes through the bent portion of the first door guide sleeve 316. The first door guide sleeve 316 is bolted to the first door body 315 at the end of the container.

[0040] In this embodiment, the first door fixing sleeve 317, the first door rotating rod 318, and the first door rotating rod base 319 constitute a standard container hinge and lock in the art.

[0041] During use, the operator moves the first door rotating rod 318 through the first door rotating rod handle 3181, thereby connecting and separating the first door rotating rod 318 from the first door rotating rod base 319, so that the first door body 315 at the end of the container rotates, realizing the opening and closing of the first door body 315 at the end of the container.

[0042] The container end second door device 32 includes a container end second door body 320, a second door guide sleeve 321, a second door fixing sleeve 322, a second door rotating rod 323, and a second door rotating rod base 324. A second door rotating rod handle 3231 is provided on the second door rotating rod 323. The length of the container end second door body 320 is greater than that of the container end first door body 315. The second door guide sleeve 321 has the same structure as the first door guide sleeve 316, the second door fixing sleeve 322 has the same structure as the first door fixing sleeve 317, the second door rotating rod handle 3231 has the same structure as the first door rotating rod handle 3181, the length of the second door rotating rod 323 is greater than that of the first door rotating rod 318, and the second door rotating rod base 324 has the same structure as the first door rotating rod base 319.

[0043] At the end of the container body 30 where the second end door device 32 is located, a third end door device 35 is also provided. The structure of the third end door device 35 is the same as that of the first end door device 31. An air conditioner 304 is installed on the third end door device 35. In this embodiment, the air conditioner 304 is an ECA-06HR-01CSZ-1227 Tongfei air conditioner with a liquid chiller model LCI-600CR-30ABOZ3.

[0044] The container body 30 is symmetrically provided with container side door devices 33 on both sides. The structure of the container side door device 33 is the same as that of the container end second door device 32.

[0045] In this embodiment, there are 10 container side door devices 33, and every five container side door devices 33 form a group that are distributed in parallel on the side of the container body 30.

[0046] Two exhaust fans 301 are arranged in parallel at the upper end of the container body. In this embodiment, the exhaust fan 301 is model NEO-400-350.

[0047] The number of quick-connect ports 305 is ten, and every five quick-connect ports 305 constitute a quick-connect port group. Adjacent quick-connect ports 305 within a quick-connect port group are arranged vertically at intervals, and the two quick-connect port groups are arranged symmetrically. In this embodiment, the quick-connect ports 305 are existing DC 1500V direct current connection charging guns.

[0048] There are two first grounding ports 310, which are distributed in parallel at both ends of the bottom of the container body 30. The structure of the second grounding port 313 is the same as that of the first grounding port 310. The first grounding ports 310 and the second grounding ports 313 are arranged symmetrically. In this embodiment, the first grounding ports 310 are the existing container body grounding devices, a total of 4, with a product size and model of 80*50*5 copper busbars.

[0049] The first air inlet louver 308 is located at the bottom of the container body 30, and the structure of the second air inlet louver 314 is the same as that of the first air inlet louver 308.

[0050] There are two charging / discharging indicator lights 303, and a Beidou module 34 is also installed between the charging / discharging indicator lights 303. In this embodiment, the Beidou module 34 is the existing gh-203 solar-powered terminal.

[0051] This invention is applicable to various high-demand scenarios, and has significant advantages, particularly in oil extraction, emergency power supply, and off-grid microgrids. For example:

[0052] In the oil extraction sector, remote oil wells lack a stable power grid and traditionally rely on diesel generators for power, resulting in high costs, significant environmental impact, and low efficiency. This equipment can provide pulsed power support for pumping units (nodding donkeys), wellhead electric heating devices, etc., and serve as an emergency backup power source to ensure the operation of critical equipment during extreme weather or diesel supply disruptions.

[0053] Off-grid microgrids: Combining renewable energy sources such as photovoltaics and wind power to build clean energy power supply systems and solve the electricity needs of remote areas.

[0054] This invention provides a mobile, towed, high-power energy storage device with integrated charging and discharging functions, overcoming the shortcomings of traditional fixed energy storage power stations and emergency power vehicles. Through its flexible towed design, multi-functional integration, and high power response speed, this device can be widely used in scenarios such as oil extraction, emergency power supply, and off-grid microgrids, demonstrating significant technical advantages and application value.

[0055] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of this invention, and should be understood that the scope of protection of this invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on these technical teachings disclosed in this invention without departing from the essence of this invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A mobile charging and discharging energy storage vehicle, characterized in that: The system includes a trailer cab (1), a trailer chassis (2), and a battery container equipment (3). The trailer cab (1) is connected to the trailer chassis (2), and the battery container equipment (3) is installed on the trailer chassis (2). The battery container equipment (3) includes a container body (30), which is a rectangular structure. One end of the container body (30) is equipped with an exhaust fan (301) and a liquid cooler (302). The other end of the container body (30) is equipped with a charging / discharging indicator light (303), an air conditioner (304), and a quick-connect port (305) from top to bottom. The exhaust fan (301) is used for ventilation inside the container body (30), the liquid cooler (302) is used for cooling inside the container body (30), and the air conditioner (304) is used for cooling inside the container body (30). The container body (30) is equipped with a pressure relief valve (306), an operation box (307), a first air inlet louver (308), a fire water interface (309), and a first grounding port (310) on one side. On the other side of the container body (30), there is a fire control box (311), a cable interface (312), a second grounding port (313), and a second air inlet louver (314). The pressure relief valve (306) is used to relieve pressure inside the container body (30). The first air inlet louver (308) and the second air inlet louver (314) provide air intake inside the container body (30). The cable interface (312) connects to the equipment inside the container body (30). The first grounding port (310) and the second grounding port (313) are used to ground the equipment inside the container body (30).

2. The mobile charging and discharging energy storage vehicle according to claim 1, characterized in that: The container body (30) is provided with a first door device (31) and a second door device (32) at both ends. The first door device (31) includes a first door body (315), a first door guide sleeve (316), a first door fixing sleeve (317), a first door rotating rod (318), and a first door rotating rod base (319). There are two first door rotating rod bases (319) arranged vertically on the container body (30). The first door guide sleeve (316) and the first door rotating rod base (319) are arranged in parallel. There are two first door guide sleeves (316) arranged vertically on the container body (30). The first door is distributed on the first door body (315) at the end of the container. The first door fixing sleeve (317) is located between the two first door guide sleeves (316) and on the first door body (315) at the end of the container. The first door rotating rod (318) passes through the first door guide sleeve (316). The first door rotating rod (318) is provided with a first door rotating rod handle (3181). The first door rotating rod handle (3181) is perpendicular to the first door rotating rod (318). The two ends of the first door rotating rod (318) correspond to the first door rotating rod base (319). The end of the first door rotating rod handle (3181) is detachably connected to the first door fixing sleeve (317).

3. A mobile charging and discharging energy storage vehicle according to claim 2, characterized in that: The container end second door device (32) includes a container end second door body (320), a second door guide sleeve (321), a second door fixing sleeve (322), a second door rotating rod (323), and a second door rotating rod base (324). The second door rotating rod (323) is provided with a second door rotating rod handle (3231). The length of the container end second door body (320) is greater than that of the container end first door body (315). The second door guide sleeve (321) has the same structure as the first door guide sleeve (316). The second door fixing sleeve (322) has the same structure as the first door fixing sleeve (317). The second door rotating rod handle (3231) has the same structure as the first door rotating rod handle (3181). The length of the second door rotating rod (323) is greater than that of the first door rotating rod (318).

4. A mobile charging and discharging energy storage vehicle according to claim 1, characterized in that: The container body (30) is symmetrically provided with container side door devices (33) on both sides. The structure of the container side door device (33) is the same as that of the container end second door device (32).

5. A mobile charging and discharging energy storage vehicle according to claim 1, characterized in that: The number of exhaust fans (301) is two, and they are arranged in parallel at the upper end of the container body.

6. A mobile charging and discharging energy storage vehicle according to claim 1, characterized in that: The number of quick connectors (305) is ten. Every five quick connectors (305) constitute a quick connector group. Adjacent quick connectors (305) in the quick connector group are arranged vertically at intervals, and the two quick connector groups are arranged symmetrically.

7. A mobile charging and discharging energy storage vehicle according to claim 1, characterized in that: The number of the first grounding ports (310) is two and they are distributed in parallel at both ends of the bottom of the container body (30). The structure of the second grounding port (313) is the same as that of the first grounding port (310). The first grounding port (310) and the second grounding port (313) are arranged symmetrically.

8. A mobile charging and discharging energy storage vehicle according to claim 1, characterized in that: The first air inlet louver (308) is located at the bottom of the container body (30), and the structure of the second air inlet louver (314) is the same as that of the first air inlet louver (308).

9. A mobile charging and discharging energy storage vehicle according to claim 1, characterized in that: There are two charging and discharging indicator lights (303), and a Beidou module (34) is also installed between the charging and discharging indicator lights (303).

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