Traction heavy truck new energy automobile battery pack

Abstract

The invention relates to the technical field of power batteries, in particular to a traction heavy truck new energy automobile battery pack. Comprising a lower shell, and a liquid cooling plate is installed in the lower shell; a battery module is mounted at the upper end of the liquid cooling plate, and a cross beam is mounted in the lower shell; the liquid cooling plate comprises an upper-layer liquid cooling plate and a lower-layer liquid cooling plate; the lower-layer liquid cooling plate is fixedly mounted at the bottom of the lower shell; according to the invention, through the cooperation of the multi-section electric push rod and the bracket, the multi-section electric push rod can push the bracket to extend out of the lower shell, so that the battery module in the lower shell is exposed, the time for an operator to disassemble the bracket and the upper-layer cooling plate is shortened, and the bracket does not need to be disassembled by using a special tool; the replacement efficiency of the battery module is improved, the disassembly and maintenance cost of the upper-layer cooling plate is reduced, the upper-layer cooling plate is prevented from being damaged due to incorrect disassembly operation, the service life of the upper-layer cooling plate is ensured, and the practicability of the battery module is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of power batteries, in particular to a battery pack for a heavy-duty traction truck new energy vehicle. Background Art

[0002] With the emergence of global environmental degradation and resource reduction, major automobile manufacturers have shifted their focus to new energy vehicles. Various electric vehicles such as hybrid vehicles, pure electric vehicles, and extended-range electric vehicles are emerging in an endless stream. In new energy electric vehicles, power batteries are key components of new energy electric vehicles. With the increasing demand for power battery systems and the gradual improvement of production efficiency and consistency requirements for battery packs, the height space of the power battery system design for passenger cars is getting smaller and smaller. This is because reducing the height space of the power battery helps to lower the center of gravity of the vehicle, and a lower center of gravity helps to reduce the roll of the vehicle when turning, thereby improving the vehicle's driving stability and driving safety.

[0003] As the height space of the battery pack decreases, it will become difficult to disassemble and replace the battery module, especially the battery module equipped with two layers of cooling plates. This is because when the battery pack is designed to be thinner, the disassembly and installation space of the battery module will be reduced accordingly, and the upper cooling plate needs to be disassembled, which greatly increases the operating difficulty and disassembly time of the staff, so that the staff needs to spend more time or use special tools to complete the disassembly and installation of the upper cooling plate; not only does it reduce the replacement efficiency of the battery module, but it also increases the disassembly and maintenance cost of the upper cooling plate;

[0004] In view of this, in order to overcome the above technical problems, the present invention proposes a battery pack for a heavy-duty traction truck new energy vehicle, which solves the above technical problems. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, the present invention proposes a battery pack for a new energy vehicle for traction heavy-duty trucks. The present invention cooperates with a multi-section hydraulic push rod and a bracket so that the multi-section hydraulic push rod can push the bracket out of a lower shell body, thereby exposing a battery module in the lower shell body, reducing the time for operators to disassemble the bracket and the upper cooling plate, and eliminating the need to use special tools to disassemble the bracket. This not only improves the replacement efficiency of the battery module, but also reduces the disassembly and maintenance costs of the upper cooling plate, avoids damage to the upper cooling plate due to incorrect disassembly operation, ensures the service life of the upper cooling plate, and effectively improves the practicability of the present invention.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a traction heavy-duty new energy vehicle battery pack described in the present invention comprises a lower shell, a liquid cooling plate is installed inside the lower shell; a battery module is installed on the upper end of the liquid cooling plate, and a crossbeam is installed inside the lower shell; the liquid cooling plate comprises an upper liquid cooling plate and a lower liquid cooling plate; the lower liquid cooling plate is fixedly installed on the bottom of the lower shell; the crossbeam is located at the upper end of the lower liquid cooling plate; the crossbeam is fixedly connected to the lower shell; a bracket is arranged above the lower liquid cooling plate; the bracket is connected to the inner wall of the lower shell; the upper end of the bracket is fixedly installed with the upper liquid cooling plate; the number of upper liquid cooling plates There are two of them; the two upper liquid-cooling plates are connected by a cooling pipe; a connecting pipe is fixedly connected to the upper end of the lower liquid-cooling plate; a through groove is provided at the upper end of the crossbeam; the connecting pipe is slidably connected in the through groove; the end of the connecting pipe away from the lower liquid-cooling plate is connected to the cooling pipe; an upper shell is provided above the upper liquid-cooling plate; the upper shell is connected to the lower shell; two groups of battery modules are provided; one group of battery modules is located between the lower liquid-cooling plate and the bracket; the other group of battery modules is installed between the upper liquid-cooling plate and the upper shell; a pushing unit is installed between the crossbeam and the bracket; the pushing unit is used to push the bracket to rise.

[0007] Preferably, the pushing unit comprises a multi-section hydraulic push rod; a groove is provided at the upper end of the cross beam; the multi-section hydraulic push rod is fixedly installed in the groove; and one end of the multi-section hydraulic push rod away from the bottom of the groove is fixedly connected to the bracket.

[0008] Preferably, two groups of cooling tubes are provided; the cooling tubes are slidingly and sealingly connected to the connecting tubes; the upper ends of the two cooling tubes are respectively fixedly connected with a liquid inlet pipe and a liquid outlet pipe; the upper end of the upper shell is provided with a liquid inlet and a liquid outlet; two cooling chambers connected with the liquid inlet and the liquid outlet are provided inside the upper shell; a connecting unit is installed in the cooling chamber; the liquid inlet pipe and the liquid outlet pipe are connected with the cooling chamber through the connecting unit.

[0009] Preferably, the connecting unit includes a connecting tube; two cylindrical grooves connected to the cooling chamber are opened at the upper end of the upper shell; the two connecting tubes are rotatably sealed and connected in the two cylindrical grooves; the lower end of the connecting tube is slidingly sealed and connected with a threaded tube that cooperates with the liquid inlet pipe and the liquid outlet pipe; and a water injection hole connected to the cooling chamber is opened on the surface of the connecting tube.

[0010] Preferably, a thermal pad is installed at the lower end of the battery module; two groups of thermal pads are provided; one group of thermal pads is located between the battery module and the lower liquid cooling plate; the other group of thermal pads is located between the battery module and the upper liquid cooling plate.

[0011] Preferably, a skeleton is embedded inside the thermal pad; the skeleton is made of chromium-copper alloy material; and the thermal pad is made of thermally conductive silicone material.

[0012] Preferably, a circular groove is provided on the lower end surface of the thermal pad; a cavity is provided inside the skeleton; an air hole connected to the cavity is provided on the surface of the skeleton; an air channel is provided at the bottom of the circular groove; one end of the air channel is connected to the circular groove, and the other end is connected to the air hole.

[0013] Preferably, a sealing plug is provided inside the cavity; the sealing plug is slidably and sealingly connected in the air hole; the sealing plug is fixedly connected to the inner wall of the cavity by a sealing spring.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The present invention cooperates with the bracket through a multi-section hydraulic push rod, so that the multi-section hydraulic push rod can push the bracket out of the lower shell, thereby exposing the battery module in the lower shell, reducing the time for operators to disassemble the bracket and the upper cooling plate, and there is no need to use special tools to disassemble the bracket; not only improves the replacement efficiency of the battery module, but also reduces the disassembly and maintenance costs of the upper cooling plate, avoids damage to the upper cooling plate due to incorrect disassembly operation, ensures the service life of the upper cooling plate, and effectively improves the practicality of the present invention.

[0016] 2. The present invention provides a circular groove at the lower end of the thermal pad, so that when the battery module squeezes the thermal pad, the air in the circular groove at the lower end of the thermal pad will flow into the air hole through the airway due to the squeezing, so that the sealing plug in the air hole is pushed by the air pressure to squeeze the sealing spring into the cavity, so that the air in the circular groove enters the cavity, thereby generating a negative pressure adsorption force in the circular groove, so that the thermal pad is adsorbed on the surface of the liquid cooling plate through the negative pressure, and then there is no need to use adhesive to adhere the thermal pad to the surface of the cooling plate, thus avoiding the problem of adhesive aging, ensuring the close fit between the thermal pad and the liquid cooling plate, and also avoiding the adhesive adhesion ratio to remain on the surface of the liquid cooling plate, reducing the cleaning viscosity of the surface of the liquid cooling plate, and improving the cleaning and maintenance effect of the liquid cooling plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0018] Figure 1 is a stereogram of the present invention;

[0019] Figure 2 is a three-dimensional diagram of the present invention without the upper shell;

[0020] Figure 3 It is a schematic diagram of the separation of the bracket and the lower shell in the present invention;

[0021] Figure 4 is an exploded view of the lower housing of the present invention;

[0022] Figure 5 It is a partial structural schematic diagram of the present invention;

[0023] Figure 6 yes Figure 5 The enlarged view of point A in the middle;

[0024] Figure 7 is a partial structural schematic diagram of the thermal pad used in the present invention;

[0025] Figure 8 yes Figure 7 The enlarged view of point B in the middle;

[0026] In the figure: 1. lower shell; 11. battery module; 12. crossbeam; 121. through groove; 122. multi-section hydraulic push rod; 123. groove; 13. upper liquid cooling plate; 131. connecting pipe; 14. lower liquid cooling plate; 141. bracket; 142. cooling pipe; 15. liquid inlet pipe; 16. liquid outlet pipe; 17. thermal pad; 171. skeleton; 172. circular groove; 173. cavity; 174. air hole; 175. airway; 176. sealing plug; 177. sealing spring; 2. upper shell; 21. liquid inlet; 22. liquid outlet; 23. cooling cavity; 24. cylindrical groove; 241. connecting tube; 242. water injection hole; 25. threaded tube. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] like Figures 1 to 8As shown, a battery pack for a new energy vehicle of a heavy-duty traction truck described in the present invention comprises a lower shell 1, wherein a liquid cooling plate is installed inside the lower shell 1; a battery module 11 is installed on the upper end of the liquid cooling plate, and a crossbeam 12 is installed inside the lower shell 1; the liquid cooling plate comprises an upper liquid cooling plate 13 and a lower liquid cooling plate 14; the lower liquid cooling plate 14 is fixedly installed on the bottom of the lower shell 1; the crossbeam 12 is located at the upper end of the lower liquid cooling plate 14; the crossbeam 12 is fixedly connected to the lower shell 1; a bracket 141 is arranged above the lower liquid cooling plate 14; the bracket 141 is connected to the inner wall of the lower shell 1; an upper liquid cooling plate 13 is fixedly installed on the upper end of the bracket 141; the number of the upper liquid cooling plates 13 is two; the two upper liquid cooling plates 13 are arranged The lower liquid cooling plate 14 is connected by a cooling pipe 142; a connecting pipe 131 is fixedly connected to the upper end of the lower liquid cooling plate 14; a through groove 121 is opened at the upper end of the cross beam 12; the connecting pipe 131 is slidably connected in the through groove 121; the end of the connecting pipe 131 away from the lower liquid cooling plate 14 is connected to the cooling pipe 142; an upper shell 2 is arranged above the upper liquid cooling plate 13; the upper shell 2 is connected to the lower shell 1; the battery module 11 is provided with two groups; one group of the battery modules 11 is located between the lower liquid cooling plate 14 and the bracket 141; the other group of the battery modules 11 is installed between the upper liquid cooling plate 13 and the upper shell 2; a pushing unit is installed between the cross beam 12 and the bracket 141; the pushing unit is used to push the bracket 141 to rise.

[0029] As an embodiment of the present invention, the pushing unit includes a multi-section hydraulic push rod 122; a groove 123 is opened at the upper end of the cross beam 12; the multi-section hydraulic push rod 122 is fixedly installed in the groove 123; the end of the multi-section hydraulic push rod 122 away from the bottom of the groove 123 is fixedly connected to the bracket 141.

[0030] As an embodiment of the present invention, two groups of cooling pipes 142 are provided; the cooling pipes 142 are slidingly and sealingly connected to the connecting pipes 131; the upper ends of the two cooling pipes 142 are respectively fixedly connected with a liquid inlet pipe 15 and a liquid outlet pipe 16; the upper end of the upper shell 2 is provided with a liquid inlet 21 and a liquid outlet 22; two cooling chambers 23 connected with the liquid inlet 21 and the liquid outlet 22 are provided inside the upper shell 2; a connecting unit is installed in the cooling chamber 23; the liquid inlet pipe 15 and the liquid outlet pipe 16 are connected with the cooling chamber 23 through the connecting unit.

[0031] As an embodiment of the present invention, the connection unit includes a connection cylinder 241; two cylindrical grooves 24 communicating with the cooling chamber 23 are opened at the upper end of the upper shell 2; the two connection cylinders 241 are rotatably sealed and connected in the two cylindrical grooves 24; the lower end of the connection cylinder 241 is slidably sealed and connected with a threaded cylinder 25 matching the liquid inlet pipe 15 and the liquid outlet pipe 16; the surface of the connection cylinder 241 is opened with a water injection hole 242 communicating with the cooling chamber 23;

[0032] During operation, as the height space of the battery pack decreases, it becomes difficult to disassemble and replace the battery module 11, especially the battery module 11 equipped with two layers of cooling plates. This is because when the battery pack is designed to be thinner, the disassembly and installation space of the battery module 11 will be reduced accordingly, and the upper cooling plate needs to be disassembled, which greatly increases the operating difficulty and disassembly time of the staff, so that the staff needs to spend more time or use special tools to complete the disassembly and installation of the upper cooling plate; not only does it reduce the replacement efficiency of the battery module 11, but it also increases the disassembly and maintenance costs of the upper cooling plate;

[0033] In this regard, the present invention cooperates with the bracket 141 through the multi-section hydraulic push rod 122, so that the multi-section hydraulic push rod 122 can push the bracket 141 out of the lower shell 1, so that the battery module 11 in the lower shell 1 is exposed, which reduces the time for operators to disassemble the bracket 141 and the upper cooling plate, and does not need to use special tools to disassemble the bracket 141; not only improves the replacement efficiency of the battery module 11, but also reduces the disassembly and maintenance costs of the upper cooling plate, avoids damage to the upper cooling plate due to incorrect disassembly operation, ensures the service life of the upper cooling plate, and effectively improves the practicality of the present invention;

[0034] In the initial state, the upper shell 2 and the lower shell 1 are fixedly connected by bolts. The lower shell 1 is welded with aluminum extrusion profiles, and a high-strength steel plate is welded on the bottom to improve the strength of the lower shell 1 and avoid the problem of the lower shell 1 being broken due to scratches; insulation cotton is pasted between the lower shell 1 and the lower liquid cooling plate 14 to ensure that heat does not dissipate from the bottom, thereby ensuring thermal management and thermal insulation performance; a polymer nano-composite protective coating is sprayed on the lower surface of the lower shell 1 to prevent ground gravel from damaging the electrophoretic layer, reduce noise, form a buffer zone, and reduce damage caused by scratches and collisions; the upper liquid cooling plate 13 and the lower liquid cooling plate 14 both use thickened stamped cold plates (upper plate thickness 1.5mm, lower plate thickness 1.2mm), which not only enhances the strength of the cold plate body, but also increases the strength of the insulation layer to prevent poor insulation due to direct contact between the battery module 11 and the liquid cooling plate;

[0035] The lower liquid cooling plate 14 is riveted to the bottom of the lower shell 1 by means of blind rivets. A formed sink is provided at the riveting position of the lower liquid cooling plate 14 to ensure that the rivet is lower than the plane of the lower liquid cooling plate 14, thereby ensuring that the battery module 11 and the lower liquid cooling plate 14 are fitted over a large area. In addition, the upper liquid cooling plate 13 is in contact with the second-layer bracket 141 only at the rivet installation point, not at a large surface, thereby preventing heat from being taken away by the second-layer bracket 141. Compared with the traditional thermal insulation technology of thermal insulation cotton, the use of thermal insulation cotton is eliminated, thereby reducing costs and ensuring thermal management performance. The lower liquid cooling plate 14 is inserted into the through groove of the crossbeam 12 through the connecting pipe 131 121, so that the connecting pipe 131 passes through the through groove 121 of the cross beam 12 and is connected to the upper liquid cooling plate 13, thereby shortening the cooling transmission path of the liquid cooling and saving the internal space of the battery pack; the cooling pipe 142 is placed in the middle of the two groups of battery modules 11, which can not only simplify the manufacturing process of the battery pack; but also shorten and optimize the pipeline path, reduce the flow path of the coolant inside the battery module 11, which helps to reduce the pressure loss of the liquid in the flow channel, and shortens the total path of the coolant from the liquid inlet 21 to the liquid outlet 22, thereby accelerating the heat transfer and improving the efficiency of heat exchange;

[0036] When in use, the external delivery pump delivers the coolant to the cooling chamber 23 through the liquid inlet 21 of the upper shell 2. Since the connecting cylinder 241 is connected to the cooling chamber 23 through the water injection hole 242 on the surface, the coolant entering the cooling chamber 23 flows into the connecting cylinder 241 connected to the liquid inlet pipe 15, so that the coolant flows into the connecting cylinder 241 through the water injection hole 242, and the coolant entering the connecting cylinder 241 flows into the liquid inlet pipe 15 through the threaded cylinder 25 that is slidably sealed at the lower end of the connecting cylinder 241, so that the coolant flows into the liquid inlet pipe 15. The cooling liquid in the cooling tube 142 can flow into the cooling tube 142 connected to the liquid inlet pipe 15, so that a part of the cooling liquid entering the cooling tube 142 flows into the two groups of upper liquid cooling plates 13 above the bracket 141, so that the two groups of upper liquid cooling plates 13 can cool the lower end surface of the battery module 11 located above, and the other part of the cooling liquid flows into the interior of the lower liquid cooling plate 14 through the connecting pipe 131 connected to the cooling tube 142, so that the cooling liquid flowing into the lower liquid cooling plate 14 can cool the battery module 11 located below. The cooling liquid flowing into the upper liquid cooling plate 13 flows into the liquid outlet pipe 16 through the cooling pipe 142 near the liquid outlet pipe 16 after heat exchange, and the cooling liquid in the lower liquid cooling plate 14 flows into the cooling pipe 142 near the liquid outlet pipe 16 through the connecting pipe 131 near the liquid outlet pipe 16 after heat exchange, so that the cooling liquid in the upper liquid cooling plate 13 and the lower liquid cooling plate 14 completes the confluence in the cooling pipe 142 near the liquid outlet pipe 16, and finally flows into the threaded cylinder 25 connected thereto through the liquid outlet pipe 16, so that The coolant flows into the cooling chamber 23 connected to the liquid outlet 22 through the threaded cylinder 25 and the connecting cylinder 241 near the liquid outlet 22, and finally flows back from the liquid outlet 22 to the external coolant collection system; through the setting of the cooling chamber 23, the coolant flowing into the cooling chamber 23 can perform heat exchange with the battery module 11 located on the upper layer through the inner wall of the cooling chamber 23, thereby improving the cooling effect on the upper battery module 11, accelerating the heat transfer efficiency of the upper battery module 11, and further improving the heat exchange efficiency;

[0037] When it is necessary to maintain or replace the battery module 11 inside the lower shell 1, the user needs to first remove the bolts on the upper shell 2. Since a slot is provided on the upper end of the connecting cylinder 241, the user can insert a flat-blade screwdriver into the slot to rotate the connecting cylinder 241, so that the connecting cylinder 241 drives the threaded cylinder 25 slidably connected thereto to rotate, so that the threaded cylinder 25 rotates relative to the liquid inlet pipe 15 and moves away from the liquid inlet pipe 15, so that the threaded cylinder 25 is spirally separated from the liquid inlet pipe 15; similarly, by rotating the threaded cylinder 25 connected to the liquid outlet pipe 16, the liquid outlet pipe 16 can be spirally separated from the threaded cylinder 25, and then the user can remove the upper shell 2; at this time, the battery located above the bracket 141 The module 11 is exposed. At this time, the user directly removes the top battery module 11, and at this time controls the multi-section hydraulic push rod 122 to operate, so that the multi-section hydraulic push rod 122 is extended, so that the extended multi-section hydraulic push rod 122 can push the bracket 141 connected thereto to rise, so that the bracket 141 drives the upper liquid cooling plate 13 to rise and extend out of the lower shell 1, so that the battery module 11 in the lower shell 1 is exposed, thereby facilitating the user to take out the battery module 11 in the lower shell 1; since the cooling pipe 142 and the connecting pipe 131 are connected in a sliding seal, the lower end of the cooling pipe 142 is also inserted into the through groove 121 of the cross beam 12, and when the bracket 141 drives the cooling pipe 142 connected thereto to rise, the cooling The tube 142 is in sliding and sealing contact with the connecting tube 131, so that the rising cooling tube 142 is still in a sliding and sealing connection state with the connecting tube 131, thereby preventing the coolant remaining in the cooling tube 142 from flowing out, so that the practicality of the present invention is improved; after the battery module 11 in the lower shell 1 is taken out and replaced, the user first controls the multi-section hydraulic push rod 122 to contract, so that the multi-section hydraulic push rod 122 pulls the bracket 141 down until the bracket 141 contacts the crossbeam 12; at this time, the multi-section hydraulic push rod 122 is reset, and the user places the new upper battery module 11 on the bracket 141, and covers the upper shell 2 on the upper end of the lower shell 1, so that the liquid inlet pipe 15 and the liquid outlet pipe 16 are both Insert it into the cylindrical groove 24 of the upper shell 2. At this time, the liquid inlet pipe 15 and the liquid outlet pipe 16 inserted into the cylindrical groove 24 respectively push the threaded cylinder 25 in contact with them to rise, so that the threaded cylinder 25 slides upward relative to the connecting cylinder 241. Then the user uses a flat-blade screwdriver to reversely rotate the two connecting cylinders 241, so that the two connecting cylinders 241 respectively drive the threaded cylinder 25 slidably connected with them to rotate in the cylindrical groove 24, so that the threaded cylinders 25 in the two cylindrical grooves 24 rotate in the opposite direction relative to the liquid inlet pipe 15 and the liquid outlet pipe 16 in contact, so that the two threaded cylinders 25 rotating in the opposite direction are threadedly connected with the liquid inlet pipe 15 and the liquid outlet pipe 16 respectively, and finally tighten the bolts to complete the connection between the upper shell 2 and the lower shell 1.

[0038] As an embodiment of the present invention, a thermal pad 17 is installed at the lower end of the battery module 11; two groups of thermal pads 17 are provided; one group of thermal pads 17 is located between the battery module 11 and the lower liquid cooling plate 14; the other group of thermal pads 17 is located between the battery module 11 and the upper liquid cooling plate 13.

[0039] As an implementation mode of the present invention, a skeleton 171 is embedded inside the thermal pad 17; the skeleton 171 is made of a chromium-copper alloy material; and the thermal pad 17 is made of a thermally conductive silicone material.

[0040] As an embodiment of the present invention, a circular groove 172 is provided on the lower end surface of the thermal pad 17; a cavity 173 is provided inside the skeleton 171; an air hole 174 connected to the cavity 173 is provided on the surface of the skeleton 171; an air channel 175 is provided at the bottom of the circular groove 172; one end of the air channel 175 is connected to the circular groove 172, and the other end is connected to the air hole 174.

[0041] As an embodiment of the present invention, a sealing plug 176 is disposed inside the cavity 173; the sealing plug 176 is slidably and sealingly connected in the air hole 174; the sealing plug 176 is fixedly connected to the inner wall of the cavity 173 via a sealing spring 177;

[0042] During operation, the present invention provides a heat-conducting pad 17 so that the heat-conducting pad 17 can provide an efficient heat conduction path, thereby accelerating the transfer of heat generated by the battery module 11 to the liquid cooling plate. Moreover, the heat-conducting pad 17 is made of a flexible material and can simultaneously absorb the fitting gap deviation between the two to ensure close contact, thereby improving the heat exchange efficiency.

[0043] The reason why the skeleton 171 made of chromium-copper alloy is embedded inside the thermal pad 17 is that the thermal pad 17 made of thermally conductive silicone material will be continuously subjected to repeated stress of vibration and impact during vehicle operation during long-term use, which can easily cause the thermal pad 17 to be repeatedly squeezed by the battery module 11, causing fatigue damage to the thermal pad 17; and the chromium-copper alloy skeleton 171 has high strength and rigidity; when the vehicle encounters vibration and impact during operation, the skeleton 171 can provide additional impact resistance to the thermal pad 17, thereby reducing the impact force transmitted to the thermal pad 17, preventing the thermal pad 17 from being damaged due to excessive impact force, avoiding cracks and wear of the thermal pad 17 due to sudden or repeated stress, thereby reducing fatigue damage of the thermal pad 17 and extending the service life of the thermal pad 17; in addition, the skeleton 171 made of chromium-copper alloy has high thermal conductivity, which can assist heat transfer from the battery module 11 to the liquid cooling plate, thereby improving thermal management performance;

[0044] Since the other side of the conventional thermal pad 17 is usually coated with adhesive, the thermal pad 17 is fixed to the liquid cooling plate by gluing. However, after long-term use, the adhesive will inevitably age over time, resulting in weakened bonding strength, which in turn causes loosening between the thermal pad 17 and the liquid cooling plate. If the bonding fails, the thermal pad 17 will fall off under vibration or impact. In addition, the adhesive will adhere to the surface of the liquid cooling plate due to aging or chemical degradation during long-term use, so that the adhesive will remain on the surface of the liquid cooling plate and is difficult to remove, thereby affecting the cleaning and maintenance effect of the liquid cooling plate.

[0045] In this regard, the present invention provides a circular groove 172 at the lower end of the thermal pad 17, so that when the battery module 11 squeezes the thermal pad 17, the air in the circular groove 172 at the lower end of the thermal pad 17 will flow into the air hole 174 through the air channel 175 due to squeezing, so that the sealing plug 176 in the air hole 174 is pushed by the air pressure to squeeze the sealing spring 177 into the cavity 173, so that the air in the circular groove 172 enters the cavity 173, so that a negative pressure adsorption force is generated in the circular groove 172, so that the thermal pad 17 is adsorbed on the surface of the liquid cooling plate by the negative pressure, and then the thermal pad 17 does not need to be adhered to the surface of the cooling plate with an adhesive, so as to avoid the aging problem of the adhesive, ensure the close fit between the thermal pad 17 and the liquid cooling plate, and also avoid the adhesive adhesion ratio to remain on the surface of the liquid cooling plate, reduce the cleaning viscosity of the surface of the liquid cooling plate, and improve the cleaning and maintenance effect of the liquid cooling plate;

[0046] When in use, the user only needs to place the battery module 11 on the thermal pad 17, so that the battery module 11 placed on the thermal pad 17 will generate a certain pressure on the thermal pad 17, so that the thermal pad 17 attached to the cooling plate is deformed due to being squeezed. At this time, the circular groove 172 of the thermal pad 17 is squeezed, so that the space of the circular groove 172 is reduced. At this time, the air in the circular groove 172 will flow into the air channel 175 at the bottom of the circular groove 172 due to being squeezed, so that the air entering the air channel 175 will enter the pore 174 on the surface of the skeleton 171, so that the pressure difference at both ends of the sealing plug 176 in the pore 174 changes, so that the sealing plug 176 in the pore 174 is pushed by the air pressure to squeeze the sealing spring 177 into the cavity 173, and the pore 174 is opened, so that the circular groove The air in 172 enters the cavity 173. At this time, the pressure difference at both ends of the sealing plug 176 is reduced, so that the sealing plug 176 is pushed by the restoring force of the sealing spring 177 and enters the air hole 174 again, so that the air hole 174 is blocked; since the air in the circular groove 172 is reduced, and the two groups of thermal pads 17 are tightly fitted with the upper liquid cooling plate 13 and the lower liquid cooling plate 14, a closed space is formed between the circular groove 172 of the thermal pad 17 and the liquid cooling plate, and the air pressure in the circular groove 172 is reduced, so that the pressure in the closed space surrounded by the circular groove 172 is lower than the external atmospheric pressure. According to Pascal's principle, the pressure difference between the thermal pad 17 and the adsorbed surface of the liquid cooling plate generates an inward adsorption force, so that the thermal pad 17 is tightly adsorbed on the adsorbed surface of the liquid cooling plate through this adsorption force.

[0047] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A battery pack for a heavy-duty traction truck new energy vehicle, comprising a lower housing (1), wherein a liquid cooling plate is installed inside the lower housing (1); a battery module (11) is installed on the upper end of the liquid cooling plate, characterized in that: A crossbeam (12) is installed inside the lower shell (1); the liquid cooling plate comprises an upper liquid cooling plate (13) and a lower liquid cooling plate (14); the lower liquid cooling plate (14) is fixedly installed at the bottom of the lower shell (1); the crossbeam (12) is located at the upper end of the lower liquid cooling plate (14); the crossbeam (12) is fixedly connected to the lower shell (1); a bracket (141) is arranged above the lower liquid cooling plate (14); the bracket (141) is connected to the inner wall of the lower shell (1); the upper end of the bracket (141) is fixedly installed with the upper liquid cooling plate (13); there are two upper liquid cooling plates (13); the two upper liquid cooling plates (13) are connected via a cooling pipe (142); the upper end of the lower liquid cooling plate (14) is fixedly connected with a connecting pipe (131) ; A through groove (121) is provided at the upper end of the cross beam (12); the connecting pipe (131) is slidably connected in the through groove (121); the end of the connecting pipe (131) away from the lower liquid cooling plate (14) is connected to the cooling pipe (142); an upper shell (2) is provided above the upper liquid cooling plate (13); the upper shell (2) is connected to the lower shell (1); two groups of battery modules (11) are provided; one group of battery modules (11) is located between the lower liquid cooling plate (14) and the bracket (141); the other group of battery modules (11) is installed between the upper liquid cooling plate (13) and the upper shell (2); a pushing unit is installed between the cross beam (12) and the bracket (141); the pushing unit is used to push the bracket (141) to rise.

2. A traction heavy-duty new energy vehicle battery pack according to claim 1, characterized in that: The pushing unit comprises a multi-section hydraulic push rod (122); a groove (123) is provided at the upper end of the cross beam (12); the multi-section hydraulic push rod (122) is fixedly installed in the groove (123); and one end of the multi-section hydraulic push rod (122) away from the bottom of the groove (123) is fixedly connected to the bracket (141).

3. A traction heavy truck new energy vehicle battery pack according to claim 2, characterized in that: Two groups of cooling pipes (142) are provided; the cooling pipes (142) are slidably and hermetically connected to the connecting pipe (131); the upper ends of the two cooling pipes (142) are respectively fixedly connected to a liquid inlet pipe (15) and a liquid outlet pipe (16); the upper end of the upper shell (2) is provided with a liquid inlet (21) and a liquid outlet (22); the interior of the upper shell (2) is provided with two cooling chambers (23) connected to the liquid inlet (21) and the liquid outlet (22); a connecting unit is installed in the cooling chamber (23); the liquid inlet pipe (15) and the liquid outlet pipe (16) are connected to the cooling chamber (23) via the connecting unit.

4. A traction heavy truck new energy vehicle battery pack according to claim 3, characterized in that: The connection unit comprises a connection tube (241); the upper end of the upper shell (2) is provided with two columnar grooves (24) connected to the cooling chamber (23); the two connection tubes (241) are rotatably sealed and connected in the two columnar grooves (24); the lower end of the connection tube (241) is slidably sealed and connected to a threaded tube (25) that matches the liquid inlet pipe (15) and the liquid outlet pipe (16); and the surface of the connection tube (241) is provided with a water injection hole (242) connected to the cooling chamber (23).

5. A traction heavy truck new energy vehicle battery pack according to claim 4, characterized in that: A thermal pad (17) is installed at the lower end of the battery module (11); two groups of the thermal pads (17) are provided; one group of the thermal pads (17) is located between the battery module (11) and the lower liquid cooling plate (14); and the other group of the thermal pads (17) is located between the battery module (11) and the upper liquid cooling plate (13).

6. A traction heavy truck new energy vehicle battery pack according to claim 5, characterized in that: The thermal pad (17) is inlaid with a skeleton (171) inside; the skeleton (171) is made of a chromium-copper alloy material; and the thermal pad (17) is made of a thermally conductive silicone material.

7. A traction heavy truck new energy vehicle battery pack according to claim 6, characterized in that: The lower end surface of the thermal pad (17) is provided with a circular groove (172); a cavity (173) is provided inside the frame (171); an air hole (174) connected to the cavity (173) is provided on the surface of the frame (171); an air channel (175) is provided at the bottom of the circular groove (172); one end of the air channel (175) is connected to the circular groove (172), and the other end is connected to the air hole (174).

8. A traction heavy truck new energy vehicle battery pack according to claim 7, characterized in that: A sealing plug (176) is provided inside the cavity (173); the sealing plug (176) is slidably and sealingly connected in the air hole (174); the sealing plug (176) is fixedly connected to the inner wall of the cavity (173) via a sealing spring (177).

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