Electric heavy truck system and battery control method thereof

Abstract

The invention relates to the technical field of electric heavy trucks, and discloses an electric heavy truck system and a battery control method thereof.The electric heavy truck system comprises a power battery and a heat management assembly, and the power battery is provided with a water inlet and a water outlet; the heat management assembly comprises a heat exchanger, a circulating pump, a fuel oil liquid heater, a compressor, a condenser and an expansion valve, the heat exchanger is provided with a first heat exchange flow channel and a second heat exchange flow channel which are in heat exchange connection, the liquid inlet end of the first heat exchange flow channel communicates with the water outlet, and the liquid inlet end of the circulating pump communicates with the liquid outlet end of the first heat exchange flow channel; the liquid inlet end of the fuel oil liquid heater is communicated with the liquid outlet end of the circulating pump, and the liquid outlet end of the fuel oil liquid heater is communicated with the water inlet; the second heat exchange runner, the compressor, the condenser and the expansion valve are sequentially communicated end to end. The power battery is heated through the fuel oil liquid heater, the electric quantity of the power battery is not consumed during heating, and the power battery can be kept at a proper temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heavy trucks, and in particular to an electric heavy truck system and a battery control method thereof. Background Art

[0002] Electric heavy trucks are heavy-duty transport vehicles powered by electricity, with the characteristics of zero emissions, low noise, high energy efficiency and strong power output. Since the power battery adapts to the temperature range of minus 25 to 40 degrees Celsius, and the most suitable operating temperature is around 25 degrees Celsius, too high or too low operating temperature will cause the battery capacity of the power battery to decrease.

[0003] Announcement No. CN118238604A discloses a control strategy for waste heat recovery of a battery-swap heavy-duty truck motor, which is used to realize the coupling control of motor waste heat recovery and PTC heater in the waste heat recovery system of the battery-swap heavy-duty truck motor. The system includes a motor water circuit system, a battery water circuit system, a chiller, a liquid-to-liquid quick-connect plug and a temperature sensor group. The motor water circuit system includes a high-voltage distribution box, a motor controller MCU, a traction motor, a first expansion water tank, a radiator side three-way valve, a radiator, a first three-way, a motor water pump, a waste heat recovery heat exchanger, a waste heat recovery heat exchanger side three-way valve and a second three-way connected in sequence. The battery water circuit system includes a power battery pack, a PTC heater and a second expansion water tank connected in sequence; the water inlet temperature of the power battery pack is heated by the PTC heater.

[0004] In the above-mentioned battery-swap heavy truck, the liquid entering the power battery is heated by a PTC heater to keep the battery at a suitable temperature for operation. However, the electric energy required by the PTC heater also comes from the energy storage of the power battery. The PTC heater heating the liquid will consume the electric energy of the power battery, resulting in a decrease in the battery life of the power battery. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, propose an electric heavy truck system and a battery control method thereof, and solve the technical problem in the prior art that heating the water temperature through the power battery will cause the power battery life to decrease.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides an electric heavy truck system, comprising: The power battery has a water inlet and a water outlet; and A thermal management component includes a heat exchanger, a circulation pump, a fuel liquid heater, a compressor, a condenser and an expansion valve. The heat exchanger has a first heat exchange channel and a second heat exchange channel connected for heat exchange. The liquid inlet end of the first heat exchange channel is connected to the drain port, the liquid inlet end of the circulation pump is connected to the liquid outlet end of the first heat exchange channel, the liquid inlet end of the fuel liquid heater is connected to the liquid outlet end of the circulation pump, and the liquid outlet end of the fuel liquid heater is connected to the water inlet; the second heat exchange channel, the compressor, the condenser and the expansion valve are connected end to end in sequence.

[0007] In one embodiment, the thermal management component further includes a water discharge temperature sensor and a water inlet temperature sensor. The water discharge temperature sensor is disposed at the water discharge port, and the water inlet temperature sensor is disposed at the water inlet.

[0008] In one embodiment, the electric heavy truck system further includes a fixing component, the fixing component includes a surrounding member, a support frame, a plurality of connecting members, a top plate and an end plate, the surrounding member includes two fixed beams and a front surrounding member, the two fixed beams are parallel to each other and spaced apart, the front surrounding member is arranged at one end of the two fixed beams and connects the two front surrounding members, the front surrounding member and the two fixed beams are surrounded to form a U-shaped receiving groove, and a plurality of connecting members connect the fixed beams and the support frame; the top plate is arranged at the top of the receiving groove and connected to the support frame, and the end plate is arranged at the U-shaped opening side of the receiving groove and connected to the support frame; The power battery is connected to the support frame and is located in a fixed cavity formed by the support frame, the two fixed beams, the front surround, the top plate and the end plate.

[0009] In one embodiment, the fixed beam is provided with two installation grooves along the length direction, and the two installation grooves are spaced apart along the height direction of the fixed beam; The connecting member includes a first connecting plate, a first connecting bolt, a second connecting bolt, a second connecting plate, an angle iron and a third connecting bolt, the first connecting plate slidably fits the fixing beam, the first connecting plate is provided with a first mounting hole relative to the mounting groove above, and a first strip groove is provided relative to the mounting groove below, the setting direction of the first strip groove is perpendicular to the setting direction of the fixing beam, the head of the first connecting bolt is slidably embedded in one of the mounting grooves, the threaded end of the first connecting bolt passes through the first mounting hole, the head of the second connecting bolt is slidably embedded in the other of the mounting grooves, and the threaded end of the second connecting bolt passes through the first strip groove; the second connecting plate is connected to the first connecting plate, the second connecting plate is provided with two second strip grooves, the setting directions of the two second strip grooves are perpendicular to the setting directions of the first strip grooves, the angle iron is connected to the support frame, and two second fixing holes are provided relative to the two second strip grooves, and the threaded end of the third connecting bolt passes through the second fixing hole and the second strip groove.

[0010] In one embodiment, the fixing assembly further comprises a plurality of side panels, which are respectively arranged on both sides of the support frame, the side panels are arranged between the support frame and the fixing beam, and are arranged between the second connecting plates of two adjacent connecting members, the side panels comprise side panels, two fixing strips, a first sealing strip and a second sealing strip, the side panels are connected to the fixing beam, the top of the side panels are bent to the bottom of the top panel, the bottom of the side panels are bent to the bottom of the support frame, the two fixing strips are respectively arranged at the top and bottom of the side panels, and are respectively connected to the side panels, the first sealing strip is arranged along the length direction of the side panels, and is arranged between the top panel and the side panels, the first sealing strip is connected to the fixing strip, and abuts against the fixing beam and abuts against the top panel via the fixing beam, the second sealing strip is arranged along the length direction of the side panels, and is arranged between the support frame and the side panels, the second sealing strip is connected to the fixing strip, and abuts against the support frame.

[0011] In one embodiment, the top and bottom of the side panel are respectively provided with a plurality of slots, the plurality of slots are arranged along the length direction of the side panel, and the plurality of slots are located at the edges of the top and bottom of the side panel; The fixing strip is formed with a fixing groove at an edge relative to the side panel, and the fixing groove is arranged along the length direction of the fixing strip, and the fixing strip is sleeved on the fixing strip through the fixing groove, and a plurality of elastic clips are formed in the fixing groove, and the plurality of elastic clips are respectively arranged on the upper and lower sides of the side panel, and one side of the elastic clip is connected to the fixing strip, and the other side is clamped in the clamping groove, and the cross-sectional area of ​​the elastic clip gradually decreases along the direction approaching the side panel, and the elastic clip can be bent when the fixing strip is sleeved on the side panel, and has elastic restoring force when clamped in the clamping groove.

[0012] In one embodiment, the cross-sections of the first sealing strip and the second sealing strip along the vertical length direction are elliptical rings.

[0013] In one of the embodiments, a polyurethane foam layer is provided in the gaps between the side panels, the front surround, the top panel, the support frame and the power battery.

[0014] In a second aspect, the present invention also relates to a battery control method for an electric heavy truck, using the above-mentioned electric heavy truck system, comprising the following steps: Before the electric heavy truck starts, the fuel liquid heater is controlled to start, the drainage temperature of the power battery is detected by the drainage temperature sensor, the water temperature change rate is calculated every 15 seconds, and the heating power of the fuel liquid heater is adjusted in real time to maintain the temperature rise curve change rate of 1°C / min; When the drain temperature reaches -10℃, the electric heavy truck can be started, and the heating work of the fuel liquid heater will be stopped when the water temperature reaches -5℃. During driving, if the drainage temperature curve shows a downward trend, the fuel heater high-efficiency heating mode is turned on when it drops 5°C from the initial value of -5°C, and stops when the drainage temperature rises 5°C.

[0015] In some embodiments, the electric heavy truck battery control method further includes the following steps: Heat the charged power battery. When the water temperature is below 0°C, turn on the fuel heater to preheat the power battery. The temperature rise rate is controlled at 1°C / min. After the temperature rises to 0℃, the heating power is reduced. As the temperature of the power battery rises, the battery supercharging rate continues to increase, the battery charging heat generation increases rapidly, and the water temperature quickly rises to 10℃ under the combined action of the heater and charging heat. At this time, the fuel liquid heater is stopped. After the temperature is above 10℃, the battery is allowed to be charged at a large super-fast rate.

[0016] Compared with the prior art, the electric heavy truck system and its battery control method provided by the present invention start the circulation pump before the electric heavy truck starts at low temperature. The circulation pump drives the coolant in the power battery to circulate through the heat exchanger and the fuel liquid heater. The fuel liquid heater is started to heat the coolant flowing through until the coolant is heated to a suitable temperature. Taking a new energy heavy truck with a total power of 256KWh as an example, when the electric heater is used to heat the coolant, the total power consumption per day is 41KWh, accounting for about 16% of the total power. However, when the fuel liquid heater is used, the fuel consumption per day is only 4.5L. The fuel liquid heater does not consume the power of the power battery, which can effectively increase the cruising range.

[0017] When the coolant needs to be cooled, the compressor, condenser and expansion valve are started. The compressor, condenser and expansion valve form a circulating cold flow. The cold flow circulates through the heat exchanger and exchanges heat with the coolant passing through the heat exchanger to cool the coolant. The compressor, condenser and expansion valve work together with the circulating pump and the fuel liquid heater to maintain the coolant within the preset temperature range to ensure the normal operation of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a power battery and a thermal management component in an electric heavy truck system provided by an embodiment of the present invention; Figure 2 It is a partial structural schematic diagram of a fixed beam and a side plate in an electric heavy truck system provided by an embodiment of the present invention; Figure 3 It is a partial structural schematic diagram of a fixed beam and a side plate in an electric heavy truck system provided by an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a fixing component in an electric heavy truck system provided by an embodiment of the present invention; Figure 5 It is a schematic diagram of the structure of an electric heavy truck system provided by an embodiment of the present invention after the top plate and the end plate are hidden; Figure 6 yes Figure 5 A partial enlarged view of source A in the middle.

[0019] Description of reference numerals: Power battery 1; Thermal management component 2; Heat exchanger 21; Circulation pump 22; Fuel liquid heater 23; Compressor 24; Condenser 25; Expansion valve 26; Drain water temperature sensor 27; Inlet water temperature sensor 28; Fixing component 3; Enclosure 31; Fixed beam 311; Mounting slot 311a; Front enclosure 312; Support frame 32; Connector 33; A first connecting plate 331; First strip groove 331a; A first connecting bolt 332; A second connecting bolt 333; A second connecting plate 334; A second strip groove 334a; Angle iron 335; A third connecting bolt 336; Top plate 34; End plate 35; Side plate 36; Side panels 361; Fixed bar 362; First sealing strip 363; A second sealing strip 364; Elastic clip 365. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] In order to solve the technical problem in the prior art that heating the water temperature by supplying energy to the power battery 1 will cause the battery life of the power battery 1 to decrease, the present invention provides an electric heavy truck system and a battery control method thereof, which can solve the problem that heating the water temperature by supplying energy to the power battery 1 will cause the battery life of the power battery 1 to decrease.

[0022] It should be noted that the electric heavy-duty truck system described in the present invention is used for but not limited to electric heavy-duty trucks, etc. For the convenience of explanation, in the present invention, only the application of the electric heavy-duty truck system to an electric heavy-duty truck is taken as an example for explanation, and the principles of applying the electric heavy-duty truck system to other types of equipment are essentially the same as those applied to electric heavy-duty trucks, and are not elaborated here.

[0023] See also Figure 1 , Figure 1An electric heavy truck system in an embodiment of the present invention includes a power battery 1 and a thermal management component 2, wherein the power battery 1 has a water inlet and a drain outlet; the thermal management component 2 includes a heat exchanger 21, a circulating pump 22, a fuel liquid heater 23, a compressor 24, a condenser 25 and an expansion valve 26, the heat exchanger 21 has a first heat exchange flow channel and a second heat exchange flow channel connected for heat exchange, the liquid inlet end of the first heat exchange flow channel is connected to the drain outlet, the liquid inlet end of the circulating pump 22 is connected to the liquid outlet end of the first heat exchange flow channel, the liquid inlet end of the fuel liquid heater 23 is connected to the liquid outlet end of the circulating pump 22, and the liquid outlet end of the fuel liquid heater 23 is connected to the water inlet; the second heat exchange flow channel, the compressor 24, the condenser 25 and the expansion valve 26 are connected end to end in sequence.

[0024] Specifically, before the electric heavy truck starts at low temperature, the circulation pump 22 is started first. The circulation pump 22 drives the coolant in the power battery 1 to circulate through the heat exchanger 21 and the fuel liquid heater 23. The fuel liquid heater 23 is started to heat the coolant flowing through until the coolant is heated to a suitable temperature. Taking a new energy heavy truck with a total power of 256KWh as an example, when the electric heater is used to heat the coolant, the total power consumption per day is 41KWh, accounting for about 16% of the total power. However, when the fuel liquid heater 23 is used, the fuel consumption per day is only 4.5L. The fuel liquid heater 23 does not consume the power of the power battery 1, which can effectively increase the cruising range.

[0025] When the coolant needs to be cooled, the compressor 24, the condenser 25 and the expansion valve 26 are started. The compressor 24, the condenser 25 and the expansion valve 26 form a circulating cold flow. The cold flow circulates through the heat exchanger 21 and exchanges heat with the coolant passing through the heat exchanger 21 to cool the coolant. The compressor 24, the condenser 25 and the expansion valve 26 cooperate with the circulation pump 22 and the fuel liquid heater 23 to maintain the coolant within a preset temperature range to ensure the normal operation of the power battery 1.

[0026] The power battery 1 has two charging modes: charging port and pantograph.

[0027] In one embodiment, the thermal management component 2 further includes a water discharge temperature sensor 27 and a water inlet temperature sensor 28. The water discharge temperature sensor 27 is disposed at the water discharge port, and the water inlet temperature sensor 28 is disposed at the water inlet.

[0028] By setting the drainage temperature sensor 27 and the water inlet temperature sensor 28, the temperature of the coolant at the drainage port and the water inlet of the power battery 1 can be detected, and the fuel liquid heater 23 is controlled to be turned on, off and the power is controlled by the temperature detected by the drainage temperature sensor 27 and the water inlet temperature sensor 28, and the compressor 24 is controlled to be turned on, off and the power.

[0029] When an electric heavy truck is working in an extremely cold area, it faces a low temperature working environment. The heating function system of the power battery 1 alone cannot meet the thermal management requirements required by the low ambient temperature. Therefore, in one embodiment, Figures 4 to 6 As shown, the electric heavy truck system also includes a fixing component 3, which includes a surrounding member 31, a support frame 32, multiple connecting members 33, a top plate 34 and an end plate 35. The surrounding member 31 includes two fixed beams 311 and a front surrounding member 312. The two fixed beams 311 are parallel to each other and spaced apart. The front surrounding member 312 is arranged at one end of the two fixed beams 311 and connects the two front surrounding members 312. The front surrounding member 312 and the two fixed beams 311 together form a U-shaped receiving groove. Multiple connecting members 33 connect the fixed beams 311 and the support frame 32; the top plate 34 is arranged at the top of the receiving groove and connected to the support frame 32, and the end plate 35 is arranged on the U-shaped opening side of the receiving groove and connected to the support frame 32; the power battery 1 is connected to the support frame 32, and is located in a fixed cavity formed by the support frame 32, the two fixed beams 311, the front surrounding member 312, the top plate 34 and the end plate 35.

[0030] The power battery 1 is built into the fixed cavity formed by the support frame 32, two fixed beams 311, the front surround 312, the top plate 34 and the end plate 35, which can support the top, bottom and surrounding of the power battery 1. The relatively closed structure formed by the support frame 32, two fixed beams 311, the front surround 312, the top plate 34 and the end plate 35 can provide a relatively closed and stable space, which is helpful for heat preservation of the power battery 1 and reduces heat loss, thereby assisting the battery heating system to more effectively maintain the battery within a suitable operating temperature range; by reducing the energy loss of the battery at low temperatures, this design helps to improve the overall energy utilization efficiency and ensure that the electric heavy truck can still maintain a long cruising range under cold conditions.

[0031] It should be understood that the connecting member 33 may be a bolt, a buckle or other connecting structures, for example, Figures 4 to 6As shown, in one embodiment, the fixed beam 311 is provided with two mounting grooves 311a along the length direction, and the two mounting grooves 311a are spaced apart along the height direction of the fixed beam 311; the connecting member 33 includes a first connecting plate 331, a first connecting bolt 332, a second connecting bolt 333, a second connecting plate 334, an angle iron 335, and a third connecting bolt 336. The first connecting plate 331 is slidably fitted to the fixed beam 311, and the first connecting plate 331 is provided with a first mounting hole relative to the upper mounting groove 311a and a first strip groove 331a relative to the lower mounting groove 311a. The setting direction of the first strip groove 331a is perpendicular to the setting direction of the fixed beam 311, and the first connecting bolt 334 is provided with an angle iron 335 and a third connecting bolt 336. 2, the head of the first connecting bolt 332 is slidably embedded in a mounting groove 311a, the threaded end of the first connecting bolt 332 passes through the first mounting hole, the head of the second connecting bolt 333 is slidably embedded in the other mounting groove 311a, and the threaded end of the second connecting bolt 333 passes through the first strip groove 331a; the second connecting plate 334 is connected to the first connecting plate 331, and the second connecting plate 334 is provided with two second strip grooves 334a, and the setting direction of the two second strip grooves 334a is perpendicular to the setting direction of the first strip groove 331a. The angle iron 335 is connected to the support frame 32, and is provided with two second fixing holes corresponding to the two second strip grooves 334a, and the threaded end of the third connecting bolt 336 passes through the second fixing hole and the second strip groove 334a.

[0032] When it is necessary to connect the support frame 32 with the fixed beam 311 through the connecting piece 33, the heads of the first connecting bolt 332 and the second connecting bolt 333 are slidably set in the two installation grooves 311a, and the positions of the first connecting bolt 332 and the second connecting bolt 333 can be adjusted as needed. After sliding to the preset position, the first connecting plate 331 is slidably fitted to the fixed beam 311, and the first connecting plate 331 is sleeved on the first connecting bolt 332 through the first installation hole, and is sleeved on the second connecting bolt 333 through the first strip groove 331a. Since the second strip groove 334a is long, the position relative to the second connecting bolt 333 can be adjusted along the length direction of the second strip groove 334a, so that the first connecting plate 331 can be smoothly sleeved on the second connecting bolt through the second strip groove 334a. 333, reducing the processing accuracy requirements and reducing the processing difficulty; then the angle iron 335 is fitted with the second connecting plate 334, and the threaded end of the third connecting bolt 336 passes through the angle iron 335 to obtain the second fixing hole and the second strip groove 334a of the second connecting plate 334, thereby realizing the connection between the angle iron 335 and the second connecting plate 334. Since the setting direction of the second strip groove 334a is perpendicular to the setting direction of the first strip groove 331a, the installation position of the angle iron 335 can be adjusted along the direction of the second strip groove 334a, so as to facilitate the connection between the support frame 32 and the fixed beam 311; at the same time, the second connecting plate 334 can block the end of the gap between the fixed beam 311 and the support frame 32 along the length direction, thereby preventing cold air from flowing along the length direction of the gap between the fixed beam 311 and the support frame 32.

[0033] After the bolt passes through the two structural members, the bolt can be threadedly connected to the second structural member, or a nut can be threadedly connected to the threaded end of the bolt to achieve a fixed connection between the two structural members through the bolt and the nut.

[0034] The fixed beam 311 and the support frame 32 are connected by the first connecting plate 331, the second connecting plate 334 and the angle iron 335. Since the second connecting plate 334 is arranged perpendicular to the first connecting plate 331 and the fixed beam 311, there is a gap between the fixed beam 311 and the power battery 1 of the support frame 32. The existence of the gap will cause heat to be lost outward from the gap. For this reason, Figure 2 and Figure 3As shown, in one embodiment, the fixing assembly 3 further includes a plurality of side panels 36, which are respectively arranged on both sides of the support frame 32, the side panels 36 are arranged between the support frame 32 and the fixing beam 311, and are arranged between the second connecting plates 334 of two adjacent connecting members 33, the side panels 36 include a side panel 361, two fixing strips 362, a first sealing strip 363 and a second sealing strip 364, the side panel 361 is connected to the fixing beam 311, the top of the side panel 361 is bent to the bottom of the top panel 34, and the bottom of the side panel 361 is bent to the support frame 32, two fixing strips 362 are respectively arranged at the top and bottom of the side panels 361 and are respectively connected to the side panels 361, a first sealing strip 363 is arranged along the length direction of the side panels 361 and is arranged between the top panel 34 and the side panels 361, the first sealing strip 363 is connected to the fixing strip 362, and abuts against the fixing beam 311 and abuts against the top panel 34 through the fixing beam 311, a second sealing strip 364 is arranged along the length direction of the side panels 361 and is arranged between the support frame 32 and the side panels 361, the second sealing strip 364 is connected to the fixing strip 362 and abuts against the support frame 32.

[0035] The side plate 361 is bent relative to the top plate 34 and the support frame 32 to block the gaps on both sides of the power battery 1 and the gap between the fixed beam 311 and the support frame 32. By setting two fixing strips 362, the first sealing strip 363 and the second sealing strip 364 can be fixed to the top and bottom of the side plate 361 respectively. The first sealing strip 363 can block the gap between the side plate 361, the fixed beam 311 and the top plate 34, and the second sealing strip 364 can block the gap between the side plate 361 and the bottom of the support frame 32.

[0036] The fixing strip 362 may be a rubber strip, a metal strip, a plastic strip, etc. The fixing strip 362 may be fixed to the side plate 361 by bonding, welding, bolting, etc. Specifically, as Figure 2 and Figure 3 As shown, in one of the embodiments, a plurality of slots (not shown in the figure) are respectively provided at the top and bottom of the side panel 361, and the plurality of slots are arranged along the length direction of the side panel 361, and the plurality of slots are located at the edges of the top and bottom of the side panel 361; a fixing slot is formed at the edge of the fixing strip 362 opposite to the side panel 361, and the fixing slot is arranged along the length direction of the fixing strip 362, and the fixing strip 362 is sleeved on the fixing strip 362 through the fixing slot, and a plurality of elastic clip strips 365 are formed in the fixing slot, and the plurality of elastic clip strips 365 are respectively arranged on the upper and lower sides of the side panel 361, and one side of the elastic clip strip 365 is connected to the fixing strip 362, and the other side is clamped in the slot, and the cross-sectional area of ​​the elastic clip strip 365 gradually decreases along the direction close to the side panel 361, and the elastic clip strip 365 can be bent when the fixing strip 362 is sleeved on the side panel 361, and has elastic reset elastic force when it is clamped in the slot.

[0037] When it is necessary to realize the connection between the fixing strip 362 and the side panel 361, the fixing strip 362 is sleeved on the top edge and the bottom edge of the side through the fixing groove, so that the sleeve connection between the fixing strip 362 and the side panel 361 is realized. In order to fix the fixing strip 362 sleeved on the side panel 361, in this embodiment, an elastic clip strip 365 is provided, and the elastic clip strip 365 is connected to the fixing strip 362 and can be clamped in the clamping groove. When the fixing strip 362 is sleeved on the side panel 361, the elastic clip strip 365 abuts against the side panel 361 and makes the elastic clip strip 365 bend relative to the side panel 361. When the elastic clip strip 365 slides to the clamping groove, the elastic clip strip 365 The side away from the fixing strip 362 is elastically inserted into the slot, and after being inserted into the slot, it is still in a deformed state and has a restoring elastic force, which has a tendency to push the fixing strip 362 to open toward both sides, so that the fixing strip 362 pushes the first sealing strip 363 to be close to the top plate 34 and pushes the second sealing strip 364 to be close to the support frame 32. The elastic clip strip 365 has the function of realizing the connection between the fixing strip 362 and the side plate 361 and pushing the first sealing strip 363 and the second sealing strip 364 to be close to the top plate 34 and the support frame 32, and the elastic clip strip 365 that elastically abuts the side plate 361 can block the gap between the fixing strip 362 and the side plate 361.

[0038] It should be understood that the cross-sectional shape of the first sealing strip 363 and the second sealing strip 364 can be circular, quadrilateral, trapezoidal, etc. Specifically, as shown in FIG. Figure 2 and Figure 3 As shown, in one embodiment, the cross-section of the first sealing strip 363 and the second sealing strip 364 along the vertical length direction is an elliptical ring.

[0039] Through the above-mentioned arrangement, when the first sealing strip 363 abuts against the top plate 34, the first sealing strip 363 can be squeezed and compressed between the fixing strip 362 and the top plate 34, and has a restoring elastic force after being squeezed and compressed, so that the first sealing strip 363 is tightly against the top plate 34, thereby sealing the gap between the side plate 361 and the top plate 34; when the second sealing strip 364 abuts against the support frame 32, the second sealing strip 364 can be squeezed and compressed between the side plate 361 and the support frame 32, and has a restoring elastic force after being squeezed and compressed, so that the second sealing strip 364 is tightly against the support frame 32.

[0040] There is a gap between the side panel 361, the front surround 312, the top panel 34, the support frame 32 and the power battery 1. The existence of the gap will affect the thermal insulation of the power battery 1. For this reason, in one of the embodiments, a polyurethane foam layer (not shown in the figure) is provided in the gap between the side panel 361, the front surround 312, the top panel 34, the support frame 32 and the power battery 1.

[0041] Polyurethane foam is filled in the gaps between the side panels 361, the front surround 312, the top panel 34, the support frame 32 and the power battery 1. After the polyurethane foam is cured, a polyurethane foam layer is formed. The polyurethane foam layer is used to fill the gaps between the side panels 361, the front surround 312, the top panel 34, the support frame 32 and the power battery 1 to avoid heat loss from the power battery 1 due to the existence of the gaps, thereby playing a role in heat preservation.

[0042] The present invention also relates to a battery control method for an electric heavy truck, using the above-mentioned electric heavy truck system, comprising the following steps: Before the electric heavy truck starts, the fuel liquid heater 23 is controlled to start, and the drainage temperature of the power battery 1 is detected by the drainage temperature sensor 27. The heating power of the fuel liquid heater 23 is adjusted in real time by calculating the water temperature change rate every 15 seconds to maintain the temperature rise curve change rate of 1°C / min; When the drain temperature reaches -10°C, the electric heavy truck can be started, and the heating work of the fuel liquid heater 23 is stopped when the water temperature continues to heat up to -5°C of the drain temperature; During driving, if the drainage temperature curve shows a downward trend, the fuel heater high-efficiency heating mode is turned on when it drops 5°C from the initial value of -5°C, and stops when the drainage temperature rises 5°C.

[0043] Specifically, when the vehicle is started for the first time at low temperature every day, the temperature of the power battery 1 is low and the vehicle is in a hurry to drive. At this time, the fuel heater needs to be controlled to operate at a larger heating power. By calculating the water temperature change rate of the drainage temperature every 15 seconds, the controller (not shown in the figure) adjusts the heating power of the fuel heater in real time through the CAN communication bus to maintain the temperature rise curve change rate of 1℃ / min to meet the requirement that the water temperature rises by 20℃ (-30℃ to -10℃) in 20 minutes. When the driving temperature reaches -10℃, the vehicle can be driven, and the fuel heater will stop working when the water temperature continues to heat up to -5℃; during driving, if the water temperature curve shows a downward trend, the fuel heater high-efficiency heating mode will be turned on when it drops by 5℃ from the initial value of -5℃, and will stop when the water temperature rises by 5℃.

[0044] When starting at low temperature for the first time, the power battery 1 needs to be heated to a certain temperature for normal driving. The initial heating from -30°C to -10°C requires 40 minutes using an electric liquid heater, while the fuel liquid heater 23 has a higher thermal conductivity and the heating time is only about 20 minutes.

[0045] The first start at low temperature requires 40 minutes to preheat the power battery 1, which is too long. The fuel liquid heater 23 can adopt a remote control function to preheat the power battery 1 in advance, so that the vehicle can be driven immediately after getting on the vehicle, avoiding long waiting time.

[0046] The traditional solution connects the two independent functional components of cooling and heating through pipes, which will increase the water connection pipes and valve group switches, increase the flow resistance, reduce the heat conduction efficiency, and also bring about failure points. This application adopts an integrated design and reasonable layout, which can effectively avoid the above disadvantages.

[0047] In some embodiments, the electric heavy truck battery control method further includes the following steps: The charged power battery 1 is heated. When the water temperature is lower than 0°C, the fuel heater is turned on to preheat the power battery 1. The temperature rise rate is controlled at 1°C / min. After the temperature rises to 0°C, the heating power is reduced. As the temperature of the power battery 1 rises, the super charging rate of the power battery 1 continues to increase, and the charging heat generated by the power battery 1 increases rapidly. Under the combined effect of the heater and the charging heat, the water temperature quickly rises to 10°C. At this time, the fuel liquid heater 23 is stopped. After the temperature is above 10°C, the power battery 1 is allowed to be charged at a large super fast rate.

[0048] Specifically, in the charging and heating step, when the water temperature is lower than 0°C, the fuel heater is turned on to preheat the power battery 1 with a relatively high power, and the temperature rise rate is controlled at 1°C / min. After the temperature rises to 0°C, the heating power is reduced. As the temperature of the power battery 1 rises, the supercharge rate of the power battery 1 continues to increase, and the charging heat of the power battery 1 increases rapidly. Under the combined effect of the heater and the charging heat, the water temperature quickly rises to 10°C, and the fuel heater is stopped at this time. After the temperature is above 10°C, the power battery 1 is allowed to be charged at a high rate super fast charge.

[0049] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An electric heavy truck system, characterized in that: include: A power battery having a water inlet and a water outlet; and A thermal management component includes a heat exchanger, a circulation pump, a fuel liquid heater, a compressor, a condenser and an expansion valve. The heat exchanger has a first heat exchange channel and a second heat exchange channel connected for heat exchange. The liquid inlet end of the first heat exchange channel is connected to the drain port, the liquid inlet end of the circulation pump is connected to the liquid outlet end of the first heat exchange channel, the liquid inlet end of the fuel liquid heater is connected to the liquid outlet end of the circulation pump, and the liquid outlet end of the fuel liquid heater is connected to the water inlet; the second heat exchange channel, the compressor, the condenser and the expansion valve are connected end to end in sequence.

2. The electric heavy truck system according to claim 1, characterized in that: The thermal management component also includes a water discharge temperature sensor and a water inlet temperature sensor. The water discharge temperature sensor is arranged at the water discharge port, and the water inlet temperature sensor is arranged at the water inlet.

3. The electric heavy truck system according to claim 1, characterized in that: It also includes a fixing assembly, which includes a surrounding member, a support frame, a plurality of connecting members, a top plate and an end plate, wherein the surrounding member includes two fixed beams and a front surrounding member, wherein the two fixed beams are parallel to each other and spaced apart, wherein the front surrounding member is arranged at one end of the two fixed beams and connects the two front surrounding members, wherein the front surrounding member and the two fixed beams are combined to form a U-shaped receiving groove, wherein the plurality of connecting members connect the fixed beams and the support frame; wherein the top plate is arranged at the top of the receiving groove and connected to the support frame, and wherein the end plate is arranged at the U-shaped opening side of the receiving groove and connected to the support frame; The power battery is connected to the support frame and is located in a fixed cavity formed by the support frame, the two fixed beams, the front surround, the top plate and the end plate.

4. The electric heavy truck system according to claim 3, characterized in that: The fixed beam is provided with two installation grooves along the length direction, and the two installation grooves are spaced apart along the height direction of the fixed beam; The connecting member includes a first connecting plate, a first connecting bolt, a second connecting bolt, a second connecting plate, an angle iron and a third connecting bolt, the first connecting plate slidably fits the fixing beam, the first connecting plate is provided with a first mounting hole relative to the mounting groove above, and a first strip groove is provided relative to the mounting groove below, the setting direction of the first strip groove is perpendicular to the setting direction of the fixing beam, the head of the first connecting bolt is slidably embedded in one of the mounting grooves, the threaded end of the first connecting bolt passes through the first mounting hole, the head of the second connecting bolt is slidably embedded in the other of the mounting grooves, and the threaded end of the second connecting bolt passes through the first strip groove; the second connecting plate is connected to the first connecting plate, the second connecting plate is provided with two second strip grooves, the setting directions of the two second strip grooves are perpendicular to the setting directions of the first strip grooves, the angle iron is connected to the support frame, and two second fixing holes are provided relative to the two second strip grooves, and the threaded end of the third connecting bolt passes through the second fixing hole and the second strip groove.

5. The electric heavy truck system according to claim 4, characterized in that: The fixing assembly also includes a plurality of side panels, the plurality of side panels are respectively arranged on both sides of the support frame, the side panels are arranged between the support frame and the fixing beam, and are arranged between the second connecting plates of two adjacent connecting members, the side panel comprises a side panel, two fixing strips, a first sealing strip and a second sealing strip, the side panel is connected to the fixing beam, the top of the side panel is bent to the bottom of the top panel, and the bottom of the side panel is bent to the bottom of the support frame, the two fixing strips are respectively arranged at the top and bottom of the side panels, and are respectively connected to the side panels, the first sealing strip is arranged along the length direction of the side panel, and is arranged between the top panel and the side panel, the first sealing strip is connected to the fixing strip, and abuts against the fixing beam and abuts against the top panel via the fixing beam, the second sealing strip is arranged along the length direction of the side panel, and is arranged between the support frame and the side panel, the second sealing strip is connected to the fixing strip, and abuts against the support frame.

6. The electric heavy truck system according to claim 5, characterized in that: A plurality of card slots are respectively provided at the top and bottom of the side panel, and the plurality of card slots are arranged along the length direction of the side panel, and the plurality of card slots are located at the edges of the top and bottom of the side panel; The fixing strip is formed with a fixing groove at an edge relative to the side panel, and the fixing groove is arranged along the length direction of the fixing strip, and the fixing strip is sleeved on the fixing strip through the fixing groove, and a plurality of elastic clips are formed in the fixing groove, and the plurality of elastic clips are respectively arranged on the upper and lower sides of the side panel, and one side of the elastic clip is connected to the fixing strip, and the other side is clamped in the clamping groove, and the cross-sectional area of ​​the elastic clip gradually decreases along the direction approaching the side panel, and the elastic clip can be bent when the fixing strip is sleeved on the side panel, and has elastic restoring force when clamped in the clamping groove.

7. The electric heavy truck system according to claim 6, characterized in that: The cross-sections of the first sealing strip and the second sealing strip along the vertical length direction are oval rings.

8. The electric heavy truck system according to claim 6, characterized in that: A polyurethane foam layer is arranged in the gaps between the side panels, the front surround, the top panel, the support frame and the power battery.

9. A battery control method for an electric heavy truck, characterized in that: The electric heavy truck system according to any one of claims 1 to 8 comprises the following steps: Before the electric heavy truck starts, the fuel liquid heater is controlled to start, the power battery drainage temperature is detected by the drainage temperature sensor, the water temperature change rate is calculated every 15 seconds, and the heating power of the fuel liquid heater is adjusted in real time to maintain the temperature rise curve change rate of 1°C / min; When the drain temperature reaches -10℃, the electric heavy truck can be started, and the heating work of the fuel liquid heater will be stopped when the water temperature reaches -5℃. During driving, if the drainage temperature curve shows a downward trend, the fuel heater high-efficiency heating mode is turned on when it drops 5°C from the initial value of -5°C, and stops when the drainage temperature rises 5°C.

10. The electric heavy truck battery control method according to claim 9, characterized in that: The following steps are also included: Heat the charged power battery. When the water temperature is below 0°C, turn on the fuel heater to preheat the power battery. The temperature rise rate is controlled at 1°C / min. After the temperature rises to 0℃, the heating power is reduced. As the temperature of the power battery rises, the battery supercharging rate continues to increase, the battery charging heat generation increases rapidly, and the water temperature quickly rises to 10℃ under the combined action of the heater and charging heat. At this time, the fuel liquid heater is stopped. After the temperature is above 10℃, the battery is allowed to be charged at a large super-fast rate.

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