A lithium battery with low temperature protection function

Abstract

The present invention relates to the field of lithium battery technology, and in particular to a lithium battery with low temperature protection function. It includes a heat dissipation shell, a battery pack is arranged in the heat dissipation shell, the heat dissipation shell is connected to an air inlet pipe, the heat dissipation shell is connected to an air outlet pipe on the side away from the air inlet pipe, a first fixed frame is fixed in the air inlet pipe, the first fixed frame is rotatably connected to an air inlet fan, the heat dissipation shell is fixed to a mirror-distributed air storage shell through a mounting frame, the air storage shell is slidably connected to a first piston plate, and the heat dissipation shell is fixed to a mirror-distributed air pump through a mounting frame. The present invention temporarily stores hot air and cold air respectively through mirror-distributed air storage shells, and specifically mixes hot and cold air according to different occasions, so as to prevent the temperature of the air entering the heat dissipation shell from decreasing in stages, thereby affecting the service life of the battery, and ensuring sufficient air to dissipate heat for the battery, thereby ensuring the stability of the battery temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a lithium battery with a low-temperature protection function. Background Art

[0002] An electric forklift is a forklift that uses electricity as a power source to operate. Its power source is mostly provided by batteries, and lithium batteries are one type of batteries. When an electric forklift transports goods from a cold storage to the outside, the electric forklift will frequently move back and forth between the cold storage and the outside. In order to prevent the battery pack from overheating and affecting its service life, existing lithium battery packs usually use air cooling or water cooling. If the lithium battery on the electric forklift is an air cooling system, the air temperature used to cool the battery pack will often change in stages when the forklift frequently enters and exits the cold storage. The staged change in temperature will cause thermal shock between the air and the battery pack. This sudden temperature change (thermal shock) will cause thermal stress inside the battery, affecting the battery's performance and life. In addition, due to the large temperature difference, when the forklift reciprocates in and out of the cold storage, it is easy to cause water droplets to condense on the battery surface, which puts higher requirements on the battery's waterproof performance and affects the battery's heat dissipation. Summary of the invention

[0003] In order to overcome the shortcomings of existing air cooling technology that when the battery frequently switches environments, thermal shock will occur between the battery pack and the air, affecting the battery performance and service life, the present invention provides a lithium battery with a low-temperature protection function that can be gradually cooled.

[0004] The technical implementation scheme of the present invention is: a lithium battery with low-temperature protection function, comprises a heat dissipation shell, a battery pack is arranged in the heat dissipation shell, the heat dissipation shell is connected with an air inlet duct, the heat dissipation shell is connected with an air outlet duct on a side of the heat dissipation shell away from the air inlet duct, the air inlet duct is fixedly connected with a first fixing frame, the first fixing frame is rotatably connected with an air inlet blade fan, the heat dissipation shell is fixedly connected with a mirror-distributed air storage shell through a mounting frame, the air storage shell is slidably connected with a first piston plate, the heat dissipation shell is fixedly connected with a mirror-distributed air pump through the mounting frame, the air pump is connected with an adjacent air storage shell through a pipeline, the air pump is connected with an air supply pipe on a side away from the adjacent air storage shell, the air supply pipe is a three-way pipe, two one-way valves are arranged in the air supply pipe, the air supply pipe is connected with the air inlet duct, the air inlet duct is provided with a speed regulating mechanism for adjusting the air intake amount of the air inlet blade fan, and the heat dissipation shell is provided with a temperature measuring mechanism for adjusting the working state of the mirror-distributed air pump.

[0005] Preferably, the speed regulating mechanism includes a rotating rod, which is rotatably connected to the air inlet pipe, and the rotating rod and the air inlet blades are transmitted through a bevel gear set. A motor is fixedly connected to the air inlet pipe, and the motor is located outside the air inlet pipe. The output shaft of the motor is fixedly connected to a first transmission wheel, and the rotating rod is splined to a second transmission wheel, and the second transmission wheel cooperates with the first transmission wheel in transmission.

[0006] Preferably, the second transmission wheel is rotatably connected to a rotating frame at a side away from the air inlet pipe, the rotating frame is fixedly connected to a fixing rod, the air inlet pipe is fixedly connected to a first fixing shell, and the first fixing shell is slidably connected to the fixing rod.

[0007] Preferably, a second piston plate is slidably connected in the first fixed shell, the second piston plate is fixedly connected to the fixed rod, a spring is arranged between the second piston plate and the first fixed shell, and two groups of through holes distributed in a mirror image are arranged on the second piston plate, and a one-way valve is arranged in one group of the through holes.

[0008] Preferably, the temperature measuring mechanism includes a second fixed frame, the second fixed frame is fixed to a side of the heat dissipation shell close to the air inlet pipe, the second fixed frame is fixed to a temperature measuring shell, the temperature measuring shell is slidably connected to a third piston plate, the second fixed frame is fixed to a second fixed shell via a mounting frame, the temperature measuring shell and the second fixed shell are connected via a pipeline, and the second fixed shell is slidably connected to a first piston rod.

[0009] Preferably, the temperature measuring shell is located on a side of the air inlet pipe away from the heat dissipation shell, so as to ensure the timeliness of temperature measurement.

[0010] Preferably, the first piston rod is fixedly connected to a mirror-distributed extrusion frame, the mirror-distributed extrusion frames are all located outside the second fixed shell, the second fixed frame is fixedly connected to a sliding frame, the sliding frame is slidably connected to a sliding frame and a sliding rod, the sliding frame and the sliding rod are respectively extruded and matched with adjacent extrusion frames, the sliding frame is fixedly connected to a mirror-distributed third fixed frame, the third fixed frame is provided with a button, the button on the third fixed frame is extruded and matched with the adjacent extrusion frame, the button on the third fixed frame is electrically connected to the mirror-distributed air pumps, and a reversing mechanism for unifying the moving direction is provided on the air inlet pipe.

[0011] Preferably, the reversing mechanism includes a first fixed plate, which is fixed to a side of the air inlet duct close to the sliding frame, the first fixed plate is rotatably connected to a rotating shaft, the rotating shaft is provided with mirror-distributed gears, the sliding frame and the sliding rod are both provided with racks, the racks on the sliding frame and the racks on the sliding rod are both meshed with adjacent gears on the rotating shaft, and a fixed frame is fixed to a side of the air inlet duct close to the first fixed plate.

[0012] Preferably, the fixed frame is slidably connected to an extrusion frame, a spring is arranged between the fixed frame and the extrusion frame, a rack is arranged on the extrusion frame, the rack on the extrusion frame is meshed with an adjacent gear on the rotating shaft, the rotating frame is fixedly connected to a fourth fixed frame, the fourth fixed frame is slidably connected to an extrusion block, a spring is arranged between the fourth fixed frame and the extrusion block, and the extrusion block is extrusion-matched with the extrusion frame.

[0013] Preferably, it also includes a baffle mechanism for controlling the flow state of air in the heat dissipation shell, the baffle mechanism is arranged on the air outlet pipe, the baffle mechanism includes a rotating plate, the rotating plate is rotatably connected to the air outlet pipe, the rotating plate is provided with a gear, a third fixed shell is fixedly connected to the air outlet pipe, the third fixed shell is connected to the second fixed shell through a pipeline, the third fixed shell is slidably connected to a second piston rod, the second piston rod is fixedly connected to a second fixed plate, the second fixed plate is provided with a rack, and the rack on the second fixed plate is meshed with the gear on the rotating plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the present invention temporarily stores hot air and cold air respectively through the mirror-distributed air storage shells, and specifically mixes the hot and cold air according to different occasions, so as to prevent the temperature of the air entering the heat dissipation shell from decreasing in stages, thereby affecting the service life of the battery, and ensuring that sufficient air is used to dissipate heat for the battery, thereby ensuring the stability of the battery temperature; the first transmission wheel and the second transmission wheel cooperate to synchronously adjust the rotation speed of the air inlet fan according to the switching of the forklift working environment, thereby reducing the amount of cold air (or hot air) entering the heat dissipation shell at the beginning, and preventing a large amount of cold air (or hot air) from entering the heat dissipation shell to generate thermal shock to the battery pack, thereby affecting the quality of the battery pack; the first fixed shell and the second piston plate cooperate to gradually change the temperature of the gas entering the heat dissipation shell, and prevent the temperature difference between the heat dissipation air and the battery from being too large, thereby causing condensation of water droplets on the battery surface, thereby affecting the heat dissipation effect of the battery; the air outlet pipe and the rotating plate cooperate to adjust the flow state of the cooling gas according to the different temperatures, increase the retention time of the cold air, reduce the retention time of the hot air, and improve the heat dissipation efficiency of the heat dissipation shell for the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic diagram of the three-dimensional structure of the present invention;

[0016] Figure 2 It is a three-dimensional structural schematic diagram of the internal structure of the heat dissipation shell of the present invention;

[0017] Figure 3 It is a three-dimensional structural schematic diagram of the matching relationship between the gas storage shell and the first piston plate of the present invention;

[0018] Figure 4 It is a three-dimensional structural schematic diagram of the internal structure of the air supplement pipe of the present invention;

[0019] Figure 5 It is a three-dimensional structural cross-sectional view of the speed regulating mechanism of the present invention;

[0020] Figure 6 It is a three-dimensional structural cross-sectional view of the matching relationship between the temperature measuring shell and the third piston plate of the present invention;

[0021] Figure 7 It is a three-dimensional structural cross-sectional view of the temperature measuring mechanism of the present invention;

[0022] Figure 8 It is a three-dimensional structural schematic diagram of the reversing mechanism of the present invention;

[0023] Fig. 9 A three-dimensional structural cross-sectional view of the matching relationship between the fourth fixing frame and the extrusion block of the present invention;

[0024] Fig.10 It is a three-dimensional structural schematic diagram of the connection relationship between the second fixed shell and the third fixed shell of the present invention;

[0025] Fig.11 It is a three-dimensional structural cross-sectional view of the matching relationship between the third fixed shell and the second piston rod of the present invention.

[0026] In the figure: 1, heat dissipation shell, 2, air inlet pipe, 3, air outlet pipe, 4, first fixed frame, 5, air inlet fan, 6, air storage shell, 7, first piston plate, 8, air pump, 9, air supply pipe, 10, speed regulating mechanism, 1001, rotating rod, 1002, motor, 1003, first transmission wheel, 1004, second transmission wheel, 1005, rotating frame, 1006, fixed rod, 1007, first fixed shell, 1008, second piston plate, 11, temperature measuring mechanism, 1101, second fixed frame, 1102, temperature measuring shell, 1103, third piston Plate, 1104, second fixed shell, 1105, first piston rod, 1106, extrusion frame, 1107, sliding frame, 1108, sliding frame, 1109, sliding rod, 1110, third fixed frame, 12, reversing mechanism, 1201, first fixed plate, 1202, rotating shaft, 1203, fixed frame, 1204, extrusion frame, 1205, fourth fixed frame, 1206, extrusion block, 13, flow blocking mechanism, 1301, rotating plate, 1302, third fixed shell, 1303, second piston rod, 1304, second fixed plate. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0028] Research has shown that existing lithium battery packs are usually cooled by air or water to prevent the battery packs from overheating and affecting their service life. If the lithium battery on the electric forklift is an air-cooled system, the air temperature used to cool the battery pack will often change in stages when the forklift frequently enters and exits the cold storage. The staged temperature change will cause thermal shock between the air and the battery pack. This sudden temperature change (thermal shock) may cause thermal stress inside the battery, affecting the battery's performance and life. In addition, due to the large temperature difference, when the forklift reciprocates in and out of the cold storage, it is easy to cause water droplets to condense on the battery surface, which puts higher requirements on the battery's waterproof performance and affects the battery's heat dissipation.

[0029] Embodiment 1: A lithium battery with low temperature protection function, such as Figure 1-Figure 4As shown, it includes a heat dissipation shell 1, a battery pack is arranged in the heat dissipation shell 1, the left side of the heat dissipation shell 1 is connected with an air inlet pipe 2, the front side of the air inlet pipe 2 is provided with a filter screen, which is used to prevent dust in the air from adhering to the battery pack and affecting the heat dissipation of the battery pack, the right side of the heat dissipation shell 1 is connected with an air outlet pipe 3, the inner side of the air inlet pipe 2 is fixedly connected with a first fixing frame 4, the first fixing frame 4 is rotatably connected with an air inlet blade fan 5 for driving air flow, the heat dissipation shell 1 is fixedly connected with two air storage shells 6 distributed in front and back mirror images through a mounting frame, the front air storage shell 6 is used to store cold air, the rear air storage shell 6 is used to store hot air, the air storage shell 6 is sealingly and slidably connected with a first piston plate 7, the heat dissipation shell 1 is fixedly connected with two air pumps 8 distributed in front and back mirror images through a mounting frame, the two air pumps 8 are located between the two first piston plates 7, and the two The air pumps 8 are connected to the adjacent air storage shells 6 through pipelines respectively, and the opposite sides of the two air pumps 8 are connected with an air supply pipe 9, which is a three-way pipe composed of a vertical pipe and a horizontal pipe. A filter is arranged on the vertical pipe opening of the air supply pipe 9, and a one-way valve is arranged in the vertical pipe of the air supply pipe 9. The flow direction of the one-way valve in the vertical pipe of the air supply pipe 9 is from top to bottom. One-way valves are arranged in the opposite sides of the horizontal pipes on the two air supply pipes 9, and the flow direction of the one-way valve is from the adjacent air storage shells 6 to the air inlet pipe 2. The horizontal pipes of the two air supply pipes 9 are connected with the air inlet pipe 2, and a speed regulating mechanism 10 for adjusting the air intake amount of the air inlet fan 5 is arranged on the air inlet pipe 2, and a temperature measuring mechanism 11 for adjusting the working state of the mirror-distributed air pumps 8 is arranged on the heat dissipation shell 1.

[0030] like Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, the speed regulating mechanism 10 includes a rotating rod 1001, which is rotatably connected to the air inlet pipe 2. The portion of the rotating rod 1001 located outside the air inlet pipe 2 is provided with a spline. The lower side of the rotating rod 1001 and the air inlet blade 5 are transmitted through a bevel gear set. A motor 1002 is fixedly connected to the upper side of the air inlet pipe 2. The motor 1002 is located outside the air inlet pipe 2. The output shaft of the motor 1002 is fixedly connected to a first transmission wheel 1003. The first transmission wheel 1003 is a truncated cone-shaped friction wheel, and its diameter gradually increases from top to bottom. The spline portion on the upper side of the rotating rod 1001 is spline-connected to a second transmission wheel 1004. The second transmission wheel 1004 is a disc-shaped friction wheel. The second transmission wheel 1004 and the first transmission wheel 1003 are transmitted and matched in a friction manner. The upper side of the second transmission wheel 1004 is rotatably connected to a rotating The frame 1005 is provided with a fixed rod 1006 on the lower side of the rotating frame 1005, and a first fixed shell 1007 slidably connected to the fixed rod 1006 is fixedly connected to the upper side of the air inlet pipe 2, and a second piston plate 1008 fixed to the lower side of the fixed rod 1006 is sealed and slidably connected to the inner side of the first fixed shell 1007, and a portion of the first fixed shell 1007 located on the upper side of the second piston plate 1008 is filled with hydraulic oil, and a spring is arranged between the second piston plate 1008 and the first fixed shell 1007, and two groups of through holes distributed in a mirror image are arranged on the second piston plate 1008, and the area of ​​one group of through holes is larger than that of the other group of through holes, wherein a one-way valve is arranged in the one group of through holes with a larger area, and the flow direction of the one-way valve is only from top to bottom, so that the second piston plate 1008 moves slowly downward to ensure that the temperature of the gas entering the heat dissipation shell 1 changes gradually.

[0031] like Figure 1 , Figure 4 and Figure 6-Figure 8As shown, the temperature measuring mechanism 11 includes a second fixing frame 1101, the second fixing frame 1101 is fixedly connected to the left side of the heat dissipation shell 1, the second fixing frame 1101 is fixedly connected to a temperature measuring shell 1102, the temperature measuring shell 1102 is located on the left side of the air inlet pipe 2, and the distance between the temperature measuring shell 1102 and the head of the electric forklift is greater than the distance between the air inlet pipe 2 and the head of the electric forklift, which is used to ensure the timeliness of the temperature measurement, the inner side of the temperature measuring shell 1102 is sealed and slidably connected with a third piston plate 1103, and the portion of the temperature measuring shell 1102 located under the third piston plate 1103 is provided with a thermal expansion material The temperature measuring shell 1102 is provided with a material, the portion of the temperature measuring shell 1102 located on the upper side of the third piston plate 1103 is filled with hydraulic oil, the second fixing frame 1101 is fixedly connected to the second fixing shell 1104 through the mounting frame, the temperature measuring shell 1102 and the second fixing shell 1104 are connected through a pipeline, and the pipeline between the two is filled with hydraulic oil, the second fixing shell 1104 is sealed and slidably connected to the first piston rod 1105, the portion of the second fixing shell 1104 located on the lower side of the first piston rod 1105 is filled with hydraulic oil, and the upper side of the first piston rod 1105 is fixedly connected to two extrusion frames 1100 distributed in upper and lower mirror images. 6. The two extrusion frames 1106 are both located outside the second fixed shell 1104. The second fixed frame 1101 is fixedly connected to a sliding frame 1107. The sliding frame 1107 is provided with rectangular grooves with upper and lower mirror images. A sliding frame 1108 is slidably connected in the rectangular groove on the lower side of the sliding frame 1107. A sliding rod 1109 is slidably connected in the rectangular groove on the upper side of the sliding frame 1107. The sliding frame 1108 and the sliding rod 1109 are both extruded and matched with the adjacent extrusion frames 1106. The two extrusion frames 1106 are located between the sliding frame 1108 and the sliding rod 1109. The sliding frame 1108 is connected to the sliding frame 1108. 07 is fixedly connected with two third fixing frames 1110 which are distributed in upper and lower mirror images, and buttons which are electrically connected to the two air pumps 8 are arranged on the third fixing frames 1110. The buttons on the third fixing frames 1110 are squeezed and matched with the adjacent squeezing frames 1106. After the buttons on the lower third fixing frame 1110 are squeezed, the front air pump 8 pumps gas from the outside into the front air storage shell 6, and the rear air pump 8 pumps gas from the rear air storage shell 6 into the air inlet pipe 2. After the buttons on the upper third fixing frame 1110 are squeezed, the opposite happens. The air inlet pipe 2 is provided with a reversing mechanism 12 for unifying the moving direction.

[0032] like Figure 1 and Figure 6-Figure 9As shown, the reversing mechanism 12 includes a first fixed plate 1201, which is fixedly connected to the front side of the air inlet pipe 2, and the left side of the first fixed plate 1201 is rotatably connected to a rotating shaft 1202, and the rotating shaft 1202 is provided with two gears distributed in left and right mirror images, and the sliding frame 1108 and the sliding rod 1109 are both provided with racks, and the racks on the sliding frame 1108 and the sliding rod 1109 are centrally symmetrically distributed, and the racks on the sliding frame 1108 and the racks on the sliding rod 1109 are both meshed with the gear on the right side of the rotating shaft 1202, and the left part of the upper side of the air inlet pipe 2 is fixedly connected to a fixed frame 1203, and the fixed frame 1203 is slidably connected to an extrusion frame 1204, and a spring is provided between the two, and the rear of the extrusion frame 1204 An inclined surface is provided on the lower side of the end, and a rack meshing with the left gear on the rotating shaft 1202 is provided on the lower side of the extrusion frame 1204. A fourth fixed frame 1205 is fixedly connected to the front side of the rotating frame 1005. The fourth fixed frame 1205 is slidably connected to the extrusion block 1206, and a spring is provided between the two. An inclined surface is provided on the lower side of the extrusion block 1206. The elastic coefficient of the spring between the fixed frame 1203 and the extrusion frame 1204 is greater than the elastic coefficient of the spring between the fourth fixed frame 1205 and the extrusion block 1206. The extrusion block 1206 is extruded and matched with the extrusion frame 1204. The extrusion frame 1204 extrudes and drives the extrusion block 1206 to move, thereby changing the transmission ratio between the first transmission wheel 1003 and the second transmission wheel 1004.

[0033] When the user starts the cold storage electric forklift (hereinafter referred to as the forklift), the user starts the motor 1002 at the same time, and the output shaft of the motor 1002 drives the first transmission wheel 1003 to rotate, and the first transmission wheel 1003 drives the second transmission wheel 1004 to rotate by friction, and the second transmission wheel 1004 drives the rotating rod 1001 to rotate, and the rotating rod 1001 drives the air inlet blade 5 to rotate through the bevel gear set, and the air inlet blade 5 rotates to drive the outside air to enter the heat dissipation shell 1 through the air inlet pipe 2 to dissipate the battery pack, and the air after dissipation flows to the right through the air outlet pipe 3 to the outside, which is the heat dissipation process of the battery pack of this device.

[0034] When the battery pack is outside the cold storage, the user controls the rear air pump 8 to draw outside air into the rear air storage shell 6 through the vertical pipe on the air supply pipe 9 and the one-way valve inside it. The hot air squeezes and drives the rear first piston plate 7 to move backward until the first piston plate 7 moves backward to the extreme position, at which time the hot air storage is completed.

[0035] When the forklift travels from outside the cold storage to inside the cold storage, the thermal expansion material on the lower side of the third piston plate 1103 in the temperature measuring shell 1102 shrinks when it is cold, and the spring between the temperature measuring shell 1102 and the third piston plate 1103 drives the third piston plate 1103 to move downward, and the hydraulic oil in the second fixed shell 1104 is sucked by the third piston plate 1103 and flows into the temperature measuring shell 1102 through the pipeline, and the first piston rod 1105 moves downward driven by the hydraulic oil, and the first piston rod 1105 drives the two extrusion frames 1106 thereon to move downward synchronously, and the lower extrusion frame 1106 squeezes and drives the sliding frame 1108 to move downward, and the rack on the sliding frame 1108 meshes with the right gear on the rotating shaft 1202 and drives the rotating shaft 1202 to rotate, and the right gear on the rotating shaft 1202 meshes with the rack on the sliding frame 1108 to drive the sliding rod 1109 to move upward synchronously, and the rotating shaft 1202 drives the left gear thereon to rotate synchronously, and the left gear of the rotating shaft 1202 The extrusion frame 1204 meshes with the rack on the extrusion frame 1204 and drives the extrusion frame 1204 to move upward, and at the same time compresses the spring between the extrusion frame 1204 and the fixed frame 1203. The extrusion frame 1204 squeezes and drives the extrusion block 1206 to move upward, and the extrusion block 1206 drives the fourth fixed frame 1205 to move upward. The fourth fixed frame 1205 drives the rotating frame 1005 and the second transmission wheel 1004 to move upward synchronously, reducing the transmission ratio between the first transmission wheel 1003 and the second transmission wheel 1004, thereby reducing the rotation speed of the air inlet fan 5. At this time, the forklift enters the cold storage, and the air temperature decreases in stages. The first transmission wheel 1003 and the second transmission wheel 1004 cooperate to adjust the rotation speed of the air inlet fan 5 synchronously according to the switching of the forklift working environment, thereby reducing the amount of cold air (or hot air) entering the heat dissipation shell 1 at the initial stage, preventing a large amount of cold air (or hot air) from entering the heat dissipation shell 1 to generate thermal shock to the battery pack, thereby affecting the quality of the battery pack.

[0036] As the rotating frame 1005 and the second transmission wheel 1004 gradually move upward, after the second transmission wheel 1004 moves upward to the limit position, as the extrusion frame 1204 continues to move upward, the extrusion frame 1204 squeezes and drives the extrusion block 1206 to move backward, and at the same time compresses the spring between the extrusion block 1206 and the fourth fixed frame 1205, until the lower inclined surface of the extrusion block 1206 loses the limit on the extrusion frame 1204, and the extrusion frame 1204 moves to the upper side of the extrusion block 1206 until the extrusion frame 1204 moves upward to the limit position, at which time the lower extrusion frame 1106 contacts and squeezes the button on the lower third fixed frame 1110 The button on the lower third fixing frame 1110 controls the rear air pump 8 to gradually pump the hot air in the rear air storage shell 6 into the rear air supply pipe 9. The hot air flows into the air inlet pipe 2 through the transverse pipe of the air supply pipe 9 and the one-way valve therein, so that the hot air is mixed with the cold air entering the air inlet pipe 2, thereby increasing the air temperature in the air inlet pipe 2. The hot air and the cold air are temporarily stored respectively through the mirror-distributed air storage shell 6, and the hot and cold air are mixed in a targeted manner according to different occasions, so as to prevent the air temperature entering the heat dissipation shell 1 from being reduced in stages, thereby affecting the battery life, and ensuring sufficient air to dissipate heat for the battery, thereby ensuring the stability of the battery temperature.

[0037] During the upward movement of the rotating frame 1005, the rotating frame 1005 drives the fixing rod 1006 to move upward, and the fixing rod 1006 drives the second piston plate 1008 to move upward, and at the same time squeezes the spring between the second piston plate 1008 and the first fixing shell 1007, and the hydraulic oil on the upper side of the second piston plate 1008 flows downward to the lower side of the second piston plate 1008 through the two through holes and two one-way valves on the second piston plate 1008. When the rotating frame 1005 moves upward to the limit position (at this time, the speed of the air inlet fan 5 is the minimum state), the hydraulic oil on the upper side of the second piston plate 1008 flows downward to the lower side of the second piston plate 1008. State), the extrusion frame 1204 loses the extrusion on the extrusion block 1206, and the spring between the second piston plate 1008 and the first fixed shell 1007 drives the second piston plate 1008 to gradually move downward. During the downward movement of the second piston plate 1008, since only two through holes on the second piston plate 1008 can pass the hydraulic oil, the second piston plate 1008 moves downward to slowly reset, that is, the transmission ratio between the first transmission wheel 1003 and the second transmission wheel 1004 is gradually restored (the rotation speed of the air inlet fan 5 is gradually restored).

[0038] As the rotation speed of the air inlet fan 5 gradually recovers, the amount of cold air entering the air inlet duct 2 gradually increases, and the temperature of the gas in the air inlet duct 2 gradually decreases. The first fixed shell 1007 cooperates with the second piston plate 1008 to gradually change the temperature of the gas entering the heat dissipation shell 1, thereby preventing the large temperature difference between the heat dissipation air and the battery from causing condensation of water droplets on the battery surface, thereby affecting the heat dissipation effect of the battery.

[0039] When the button on the above-mentioned lower third fixed frame 1110 controls the rear air pump 8 to replenish air into the air inlet pipe 2, the button on the lower third fixed frame 1110 simultaneously controls the front air pump 8 to absorb external cold air into the front air storage shell 6 through the pipe on the upper side of the front air replenishment pipe 9 and the one-way valve and store it until the front first piston plate 7 moves forward to the extreme position, at which time the two air pumps 8 are closed.

[0040] When the forklift moves from the cold storage to the outside again, the heat expansion material in the temperature measuring shell 1102 expands due to the heat, thereby driving the third piston plate 1103 to move upward, and at the same time squeezing the spring between the temperature measuring shell 1102 and the third piston plate 1103, the oil circuit reflux drives the first piston rod 1105 to move upward and reset, the spring between the extrusion frame 1204 and the fixed frame 1203 drives the extrusion frame 1204 to move downward and reset, the lower side inclined surface of the extrusion frame 1204 contacts and squeezes to the extrusion block 1206, and the extrusion block 1206 is squeezed backward Move, and at the same time compress the spring between the extrusion block 1206 and the fourth fixed frame 1205, until the extrusion frame 1204 moves to the lower side of the extrusion block 1206. At this time, the extrusion frame 1204 is reset, and the extrusion frame 1204 synchronously drives the sliding frame 1107 and the sliding frame 1108 to reset synchronously, and the front air storage shell 6 discharges cold air into the air inlet pipe 2 and mixes it with the hot air entering the air inlet pipe 2. Then, in the same way as above, the temperature of the air entering the heat dissipation shell 1 gradually changes until the forklift stops working, and the use of this device is completed.

[0041] Embodiment 2: Based on embodiment 1, Figure 1 , Figure 2 , Fig.10 and Fig.11 As shown, it also includes a baffle mechanism 13 for controlling the air flow state in the heat dissipation shell 1, the baffle mechanism 13 is arranged on the air outlet pipe 3, the baffle mechanism 13 includes a rotating plate 1301, the rotating plate 1301 is composed of a disc and a round rod, the round rod part of the rotating plate 1301 is rotatably connected to the air outlet pipe 3, a gear is arranged on the upper side of the round rod part of the rotating plate 1301, the gear on the rotating plate 1301 is located outside the air outlet pipe 3, a third fixed shell 1302 is fixedly connected to the upper side of the air outlet pipe 3, hydraulic oil is filled in the third fixed shell 1302, the third fixed shell 1302 is connected to the second fixed shell 1104 through a pipeline, and the pipeline between the two is filled with hydraulic oil, the third fixed shell 1302 is sealingly and slidably connected to the second piston rod 1303, the left side of the second piston rod 1303 is fixedly connected to the second fixed plate 1304, and the second fixed plate 1304 is provided with a rack meshing with the gear on the rotating plate 1301.

[0042] When the first piston rod 1105 moves downward (i.e. when a forklift enters the cold storage from the outside), part of the hydraulic oil in the second fixed shell 1104 flows into the third fixed shell 1302 through the pipeline, and the hydraulic oil squeezes and drives the second piston rod 1303 to move leftward, and the second piston rod 1303 drives the second fixed plate 1304 and its upper rack to move leftward, and the upper rack of the second fixed plate 1304 meshes with the gear on the rotating plate 1301 and drives the rotating plate 1301 to rotate, thereby reducing the ventilation area of ​​the air outlet 3 and extending the time when the forklift enters the cold storage. The activity time of cold air in the heat dissipation shell 1 slows down the air flow rate, so that the temperature in the heat dissipation shell 1 changes at a uniform rate, preventing thermal shock to the battery, thereby affecting the service life of the battery. When the forklift moves from the cold storage to the outside, the oil circuit reflux drives the rotating plate 1301 to reset, thereby preventing overheating in the heat dissipation shell 1 from affecting the heat dissipation of the battery pack. The air outlet pipe 3 cooperates with the rotating plate 1301 to adjust the flow state of the cooling gas according to the different temperatures of the cooling gas, thereby increasing the residence time of the cold air and reducing the residence time of the hot air, thereby improving the heat dissipation efficiency of the heat dissipation shell 1 for the battery.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A lithium battery with low temperature protection function, comprising a heat dissipation shell (1), a battery pack being arranged in the heat dissipation shell (1), the heat dissipation shell (1) being connected to an air inlet pipe (2), a side of the heat dissipation shell (1) away from the air inlet pipe (2) being connected to an air outlet pipe (3), a first fixing frame (4) being fixedly connected in the air inlet pipe (2), the first fixing frame (4) being rotatably connected to an air inlet blade fan (5), wherein: It also includes mirror-image-distributed air storage shells (6), the mirror-image-distributed air storage shells (6) are all fixedly connected to the heat dissipation shell (1) via a mounting frame, the air storage shells (6) are slidably connected to a first piston plate (7), the heat dissipation shell (1) is fixedly connected to a mirror-image-distributed air pump (8) via a mounting frame, the air pump (8) is connected to an adjacent air storage shell (6) via a pipeline, the air pump (8) is connected to an air supply pipe (9) on a side away from the adjacent air storage shell (6), the air supply pipe (9) is a three-way pipe, two one-way valves are arranged in the air supply pipe (9), the air supply pipe (9) is connected to the air inlet pipe (2), the air inlet pipe (2) is provided with a speed regulating mechanism (10) for adjusting the air intake amount of the air inlet fan (5), and the heat dissipation shell (1) is provided with a temperature measuring mechanism (11) for adjusting the working state of the mirror-image-distributed air pump (8); The speed regulating mechanism (10) comprises a rotating rod (1001), the rotating rod (1001) is rotatably connected to the air inlet pipe (2), the rotating rod (1001) and the air inlet blade fan (5) are driven via a bevel gear set, a motor (1002) is fixedly connected to the air inlet pipe (2), the motor (1002) is located outside the air inlet pipe (2), an output shaft of the motor (1002) is fixedly connected to a first transmission wheel (1003), the rotating rod (1001) is spline-connected to a second transmission wheel (1004), and the second transmission wheel (1004) is in transmission cooperation with the first transmission wheel (1003); The second transmission wheel (1004) is rotatably connected to a rotating frame (1005) at a side away from the air inlet pipe (2); the rotating frame (1005) is fixedly connected to a fixing rod (1006); the air inlet pipe (2) is fixedly connected to a first fixing shell (1007); the first fixing shell (1007) is slidably connected to the fixing rod (1006); A second piston plate (1008) is slidably connected in the first fixed shell (1007), the second piston plate (1008) is fixedly connected to the fixed rod (1006), a spring is arranged between the second piston plate (1008) and the first fixed shell (1007), and two groups of through holes distributed in a mirror image are arranged on the second piston plate (1008), and a one-way valve is arranged in one group of the through holes; The temperature measuring mechanism (11) comprises a second fixing frame (1101), the second fixing frame (1101) being fixedly connected to a side of the heat dissipation shell (1) close to the air inlet pipe (2), the second fixing frame (1101) being fixedly connected to a temperature measuring shell (1102), the temperature measuring shell (1102) being slidably connected to a third piston plate (1103), the second fixing frame (1101) being fixedly connected to a second fixing shell (1104) via a mounting frame, the temperature measuring shell (1102) and the second fixing shell (1104) being connected via a pipeline, and the second fixing shell (1104) being slidably connected to a first piston rod (1105); The heat dissipation shell (1) further comprises a flow-blocking mechanism (13) for controlling the air flow state in the heat dissipation shell (1), the flow-blocking mechanism (13) being arranged on the air outlet pipe (3), the flow-blocking mechanism (13) comprising a rotating plate (1301), the rotating plate (1301) being rotatably connected to the air outlet pipe (3), the rotating plate (1301) being provided with a gear, the air outlet pipe (3) being fixedly connected with a third fixed shell (1302), the third fixed shell (1302) being connected with the second fixed shell (1104) via a pipeline, the third fixed shell (1302) being slidably connected with a second piston rod (1303), the second piston rod (1303) being fixedly connected with a second fixed plate (1304), the second fixed plate (1304) being provided with a rack, the rack on the second fixed plate (1304) being meshed with the gear on the rotating plate (1301).

2. A lithium battery with low temperature protection function according to claim 1, characterized in that: The temperature measuring shell (1102) is located on a side of the air inlet pipe (2) away from the heat dissipation shell (1) and is used to ensure the timeliness of temperature measurement.

3. The lithium battery with low temperature protection function according to claim 1, characterized in that: The first piston rod (1105) is fixedly connected to a mirror-distributed extrusion frame (1106), and the mirror-distributed extrusion frames (1106) are all located outside the second fixed shell (1104). The second fixed frame (1101) is fixedly connected to a sliding frame (1107), and the sliding frame (1107) is slidably connected to a sliding frame (1108) and a sliding rod (1109), and the sliding frame (1108) and the sliding rod (1109) are respectively extruded and matched with adjacent extrusion frames (1106). The sliding frame (1107) is fixedly connected to a mirror-distributed third fixed frame (1110), and a button is provided on the third fixed frame (1110), and the button on the third fixed frame (1110) is extruded and matched with the adjacent extrusion frame (1106), and the button on the third fixed frame (1110) is electrically connected to the mirror-distributed air pump (8), and a reversing mechanism (12) for unifying the moving direction is provided on the air inlet pipe (2).

4. A lithium battery with low temperature protection function according to claim 3, characterized in that: The reversing mechanism (12) comprises a first fixed plate (1201), the first fixed plate (1201) being fixedly connected to a side of the air inlet pipe (2) close to the sliding frame (1107), the first fixed plate (1201) being rotatably connected to a rotating shaft (1202), the rotating shaft (1202) being provided with mirror-distributed gears, the sliding frame (1108) and the sliding rod (1109) being provided with racks, the racks on the sliding frame (1108) and the racks on the sliding rod (1109) being meshed with adjacent gears on the rotating shaft (1202), and the side of the air inlet pipe (2) close to the first fixed plate (1201) being fixedly connected to a fixed frame (1203).

5. A lithium battery with low temperature protection function according to claim 4, characterized in that: The fixed frame (1203) is slidably connected to an extrusion frame (1204), a spring is provided between the fixed frame (1203) and the extrusion frame (1204), a rack is provided on the extrusion frame (1204), the rack on the extrusion frame (1204) is meshed with an adjacent gear on the rotating shaft (1202), the rotating frame (1005) is fixedly connected to a fourth fixed frame (1205), the fourth fixed frame (1205) is slidably connected to an extrusion block (1206), a spring is provided between the fourth fixed frame (1205) and the extrusion block (1206), and the extrusion block (1206) is extrusion-matched with the extrusion frame (1204).

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