Integrated battery box body based on double-circulation liquid cooling system

Abstract

The invention discloses an integrated battery box body based on a double-circulation liquid cooling system, which comprises a box body, a battery area, a low-flow-rate pipeline, a high-flow-rate pipeline, a cooler and a liquid pump, a plurality of cooling plates are arranged in the battery area, and low-flow-rate flow channels and high-flow-rate flow channels are arranged in the cooling plates; the two ends of the cooling plate are provided with through openings and switching pipes which are in sliding sealing connection with the low-flow-speed flow channels and used for switching the high-flow-speed pipelines to be communicated with the high-flow-speed flow channels through sliding, and air bag assemblies used for pushing the switching pipes to slide through battery heat changes are arranged in the low-flow-speed flow channels. According to the invention, the battery box body is provided with a low-flow-rate pipeline and a high-flow-rate pipeline which can realize double circulation by only one liquid pump, so that the liquid cooling efficiency of the battery is enhanced; and the switching pipe and the airbag assembly are arranged in the cooling plate, so that the flow speed of the cooling liquid is automatically switched according to the battery temperature, and the liquid cooling efficiency of the cooling plate on the battery is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery boxes, and in particular to an integrated battery box based on a double-circulation liquid cooling system. Background Art

[0002] The battery case liquid cooling system is a key component used to maintain battery temperature, improve performance and extend battery life. The liquid cooling system removes heat from the battery module or battery stack by circulating cooling liquid or heat transfer liquid and dissipates it to the external environment.

[0003] Most liquid cooling systems cool the battery case through a one-way circulating heat exchange pipe. When the heat of some batteries is too high, the flow rate of the heat exchange pipe can only be increased by adjusting the liquid pump power. This adjusts the liquid cooling efficiency of all batteries, but cannot adjust the liquid cooling efficiency of only the batteries with excessive heat or parts of these batteries. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an integrated battery box based on a double-circulation liquid cooling system.

[0005] The technical solution of the present invention is: an integrated battery box based on a double-circulation liquid cooling system, comprising a box, a battery area arranged inside the box, a low-flow-rate pipeline and a high-flow-rate pipeline surrounding the outside of the battery area from the inside to the outside, a cooler and a liquid pump, wherein the battery area is provided with a plurality of cooling plates for dividing it into a plurality of battery compartments,

[0006] The cooling plate is provided with a plurality of alternatingly distributed low-flow velocity channels and high-flow velocity channels, and both ends of the cooling plate have through openings corresponding to each low-flow velocity channel. The through openings are provided with switching tubes that are slidingly and sealingly connected to the low-flow velocity channels and are used to switch the high-flow velocity pipeline to the high-flow velocity channel by sliding. The low-flow velocity channel is provided with an airbag assembly that utilizes the heat change of the battery to drive the switching tube to slide.

[0007] Furthermore, one end of the switching tube is sealed and slidingly sealed, passes through the low-flow velocity pipeline and is slidingly sealed and connected to the high-flow velocity pipeline, the other end of the switching tube is slidingly sealed and connected to the low-flow velocity channel, and the interior of the switching tube is divided into a low-flow velocity branch and a high-flow velocity branch by a partition plate, the other end of the switching tube has a third through hole connected to the low-flow velocity branch, and the low-flow velocity branch is provided with a first through hole connected to the low-flow velocity pipeline, the side wall of the switching tube has a fourth through hole connected to the high-flow velocity branch, the high-flow velocity channel is provided with a fifth through hole for slidingly connecting to the fourth through hole, and the high-flow velocity branch is provided with a second through hole slidingly connecting to the high-flow velocity pipeline.

[0008] Description: It is only necessary to drive the corresponding switching tube to slide according to the heat change of the battery, so that the connection state with the high flow rate pipeline can be switched, and the single-circuit cooling mode of the low-flow flow channel in the cooling plate and the dual-circuit cooling mode of the low-flow flow channel cooling + high-flow flow channel cooling can be switched mutually. The low-flow branch pipe and the high-flow branch pipe are set in one pipe body. Compared with the two branches being independently set in their respective flow channels, the number of pipe bodies is reduced. In addition, when the two branches are independently set, if the low-flow pipe and the high-flow pipe are stacked, the thickness of the cooling plate will be increased, thereby reducing the volume of the battery compartment, the number of batteries that can be placed will be reduced, and the cooling efficiency will also be relatively reduced; if the stacking is not set, the high-flow branch pipe directly penetrates the low-flow pipe, but the high-flow channel is narrow, and the coolant flow rate of the high-flow pipe is relatively slow. If it does not penetrate and bypass the low-flow pipe to connect with the high-flow pipe, it is necessary to provide a larger lateral space for the sliding switching process of the switching pipe; and the high-flow branch pipe cannot adjust the flow rate of the low-flow branch pipe through its connection state (i.e., adjusting the height of the partition).

[0009] Furthermore, the airbag assembly includes a plurality of heat conducting sheets embedded on the inner wall of the cooling plate and a plurality of airbag rods correspondingly connected to the heat conducting sheets, wherein the airbag rods are filled with any one of air, kerosene or industrial alcohol.

[0010] Description: According to the expansion and contraction of the airbag rod, the switching tube is directly pushed to switch between low flow rate and high flow rate. The structure is simple and can perform targeted control according to changes in battery temperature.

[0011] Furthermore, the partition is slidably and sealingly connected to the inner wall of the switching tube up and down.

[0012] Note: The partition can be slidable to change the space size of the low-flow branch pipe, thereby adjusting the flow rate of the low-flow branch pipe accordingly.

[0013] Furthermore, a first wedge block sealingly and slidingly connected to the high flow rate branch pipe is provided at the bottom, a second wedge block in contact with the first wedge block is provided on the partition plate, and a spring rod for automatically resetting the first wedge block is provided in the high flow rate branch pipe.

[0014] Description: The first wedge block can enhance the regulating effect of the water pressure of the high-flow branch on the height of the partition. After the high-flow pipeline is connected, the space of the low-flow branch is reduced to increase its flow rate and enhance the cooling efficiency.

[0015] Furthermore, a side wall on one side of the battery compartment is provided with a slide groove, a screw rotatably connected to both ends of the slide groove, and a slider threadedly sleeved on the screw, a clamping plate is slidably provided on the slider, a first airbag, a second airbag arranged on both sides of the clamping plate and connected to the first airbag is provided on the clamping plate, a clamping groove for clamping with the second airbag is provided on the side wall on the other side of the battery compartment, and an anti-slip sheet is provided on the end of the second airbag to enhance the friction between it and the clamping groove.

[0016] Description: The provision of the card plate, the first air bag and the second air bag can enable batteries of any height to be clamped by the card plate to fix the height of the battery, and there is no interaction force between the card plate and the battery, and no squeezing damage to the battery will occur. Compared with the one-to-one corresponding card connection method of the card block and the card slot, the problem that there is always a height difference between the card slots of multiple heights, the card block cannot be seamlessly attached to the battery surface under any circumstances, and the battery has the disadvantage of shaking space and thus being unstable in placement, is solved. Compared with the prior art method of using a spring plate to press the card block down to the battery surface to fill the height difference of the card slot, on the one hand, the spring has elasticity and cannot completely press it down stably, and on the other hand, the spring plate increases the pressure on the battery surface, which may produce a certain squeezing force on the battery. Therefore, the arrangement of the present invention can enable batteries of any height to be placed stably while improving the applicability of the battery compartment.

[0017] Furthermore, the box body is made of aluminum alloy material, and the high-flow rate pipeline is provided with a plurality of heat-conducting rods connected to the side wall of the battery compartment.

[0018] Note: If the high-flow-rate pipe is not directly attached to the side wall of the battery compartment, the aluminum alloy material can be used as a heat spreader. Through the temperature-conducting connection between the heat conducting rod and the side wall of the battery compartment, the cooling efficiency of the high-flow-rate pipe can be evenly transferred to the side wall of the battery compartment.

[0019] Furthermore, the low-flow-velocity flow channel is wider than the high-flow-velocity flow channel.

[0020] Note: Low-flow channels can rely on a large channel width to maintain good liquid cooling efficiency during basic liquid cooling, and relatively narrower channels can increase the flow rate when high-flow pipelines are connected.

[0021] Furthermore, the sealing sleeve is arranged between the low-flow-rate pipeline and the high-flow-rate pipeline, and a plurality of sealing holes for the sliding of the switching tube are arranged on the sealing sleeve.

[0022] Note: The sealing sleeve is provided to prevent the switching tube from leaking coolant when switching the flow rate, and the sealing hole is provided to allow the switching tube to switch freely.

[0023] The beneficial effects of the present invention are:

[0024] (1) The battery box of the present invention only needs one liquid pump to realize the dual-circulation low-flow-rate pipeline and high-flow-rate pipeline. The low-flow-rate pipeline cools the battery over a large area at a low speed through the cooling plate, and the high-flow-rate pipeline cools the battery periphery over a small area at a high speed. The two pipelines do not interfere with each other and cooperate to enhance the liquid cooling efficiency of the battery. A switching tube and an airbag assembly are arranged in the cooling plate. When the temperature of a part of the battery area increases or the cooling is restored, the airbag expands and contracts and automatically drives the switching tube in the corresponding area to switch to a state of connection or disconnection with the high-flow-rate pipeline. When the airbag expands thermally, the cooling plate adds a high-flow-rate flow channel on the basis of the low-flow flow channel, thereby enhancing the liquid cooling efficiency of the cooling plate for the battery and rapidly reducing the heat of the battery.

[0025] (2) The battery box of the present invention can switch its connection state with the high-flow-rate pipeline by only driving the corresponding switching tube to slide according to the heat change of the battery, and switch between the single-circuit cooling mode of the low-flow-rate channel and the dual-circuit cooling mode of the low-flow-rate channel + high-flow-rate channel in the cooling plate. The low-flow-rate branch pipe and the high-flow-rate branch pipe are arranged in one pipe body. Compared with the two branches being independently arranged in their respective flow channels, the number of pipe bodies is reduced. In addition, when the two branches are independently arranged, if the low-flow-rate pipeline and the high-flow-rate pipeline are stacked, The thickness of the cooling plate will increase, thereby reducing the volume of the battery compartment, reducing the number of batteries that can be placed and the cooling efficiency will be relatively reduced; if it is not stacked, the high-flow branch pipe will directly penetrate the low-flow pipe, but the high-flow channel is narrow, and the coolant flow rate of the high-flow pipe is relatively slow. If it does not penetrate and bypass the low-flow pipe to connect with the high-flow pipe, it is necessary to provide a larger lateral space for the sliding switching process of the switching pipe; and the high-flow branch pipe cannot adjust the flow rate of the low-flow branch pipe by its connection state (that is, adjusting the height of the partition). BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a diagram of the internal structure of the battery box of the present invention;

[0027] Figure 2 It is a structural diagram of a cooling plate of a battery box embodiment 1 of the present invention;

[0028] Figure 3 This is a structural diagram of the switching tube of the battery box of the present invention;

[0029] Figure 4 This is a bottom structural diagram of the switching tube of the battery box embodiment 1 of the present invention;

[0030] Figure 5 It is a diagram of the position of the switch tube when the battery box of the present invention is liquid-cooled;

[0031] Figure 6 It is a diagram showing the position of the switch tube after the battery box of the present invention switches to a high flow rate;

[0032] Figure 7 It is a structural diagram of the airbag assembly of the battery box of the present invention;

[0033] Figure 8 This is a diagram showing the internal structure of the switch tube of the battery box embodiment 2 of the present invention;

[0034] Fig. 9 It is a structural diagram of the battery compartment side wall of the battery box embodiment 3 of the present invention;

[0035] Among them, 1-box, 11-sealing sleeve, 12-slide groove, 121-screw, 122-slider, 123-clamping plate, 124-clamping groove, 125-first airbag, 126-second airbag, 2-cooling plate, 21-low flow channel, 211-third through hole, 22-high flow channel, 221-fourth through hole, 222-fifth through hole, 23-switching tube, 231-low flow branch, 232-high flow branch, 233-first through hole, 234-second through hole, 235-spring rod, 236-partition, 237-first wedge block, 238-second wedge block, 24-airbag assembly, 241-heat conductive sheet, 242-airbag rod, 3-liquid pump, 31-low flow pipeline, 32-high flow pipeline, 33-heat conductive rod, 4-cooler. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with specific implementation methods to better reflect the advantages of the present invention.

[0037] Embodiment 1: An integrated battery box based on a double-circulation liquid cooling system, such as Figure 1 As shown, it includes a box body 1, a battery area arranged inside the box body 1, a low flow rate pipe 31 and a high flow rate pipe 32 surrounding the outside of the battery area from the inside to the outside, and a cooler 4 and a liquid pump 3. The cooler 4 and the liquid pump 3 adopt the existing technology, and the coolant can adopt ethylene glycol type antifreeze coolant. A plurality of cooling plates 2 are provided in the battery area for dividing it into a plurality of battery compartments, and the low flow rate pipe 31 and the high flow rate pipe 32 are arranged side by side;

[0038] like Figure 2 As shown, the cooling plate 2 is provided with a plurality of alternately distributed low-flow channels 21 and high-flow channels 22, the width of the low-flow channel 21 is wider than that of the high-flow channel 22, and the width difference is 5 cm, and both ends of the cooling plate 2 have through openings corresponding to each low-flow channel 21, and the through openings are provided with a switching tube 23 that is slidably sealed and connected to the low-flow channel 21 and is used to switch the high-flow pipeline 32 to the high-flow channel 22 by sliding, and the low-flow channel 21 is provided with an airbag assembly 24 for driving the switching tube 23 to slide by utilizing the heat change of the battery,

[0039] like Figure 7As shown, the airbag assembly 24 includes a plurality of heat-conducting sheets 241 embedded on the inner wall of the cooling plate 2 and a plurality of airbag rods 242 correspondingly connected to the heat-conducting sheets 241, and the airbag rods 242 are filled with air; the heat-conducting sheets 241 can be made of heat-conducting silicone sheets, the box body 1 is made of aluminum alloy material, such as 6061 aluminum alloy, and the high-flow rate pipeline 32 is provided with a plurality of heat-conducting rods 33 connected to the side wall of the battery compartment, and the heat-conducting rods 33 can also be made of 6061 aluminum alloy material;

[0040] like Figure 2 to Figure 6 As shown, one end of the switching tube 23 is sealed and slidingly sealed to penetrate the low flow velocity pipeline 31 and is slidingly sealed to be connected with the high flow velocity pipeline 32, the other end of the switching tube 23 is slidingly sealed to be connected with the low flow velocity channel 21, and the interior of the switching tube 23 is divided into a low flow velocity branch pipe 231 and a high flow velocity branch pipe 232 by a partition plate 236, the other end of the switching tube 23 has a third through hole 211 connected to the low flow velocity branch pipe 231, and the low flow velocity branch pipe 23 is provided with a first through hole 233 connected to the low flow velocity pipeline 31, and the side wall of the switching tube 23 has a fourth through hole 221 connected to the high flow velocity branch pipe 232, A fifth through hole 222 for slidingly connecting with the fourth through hole 221 is provided on the high-flow velocity channel 3, and a second through hole 234 for slidingly connecting with the high-flow velocity pipe 32 is provided on the high-flow velocity branch pipe 232; it can be understood that the first through hole 233 is in a connected state with the low-flow velocity pipe 31 when the switching tube 23 moves, and the second through hole 234 is connected with the high-flow velocity pipe 32 after the switching tube 23 moves, that is, after the airbag assembly 24 is triggered; a sealing sleeve 11 is provided between the low-flow velocity pipe 31 and the high-flow velocity pipe 32, and the sealing sleeve 11 is provided with a plurality of sealing holes for the sliding of the switching tube 23.

[0041] The working principle of the integrated battery box based on the dual-circulation liquid cooling system is as follows: after the battery is loaded into the box 1, the liquid pump 3 and the cooler 4 are turned on, and the coolant is divided into a low-flow velocity pipeline 31 and a high-flow velocity pipeline 32 for dual circulation. During basic liquid cooling, the coolant in the low-flow velocity pipeline 31 enters the low-flow velocity channel 21 of each cooling plate 2 from the liquid pump 3 through the first through hole 233 of the low-flow velocity branch pipe 231 at one end, flows out from the low-flow velocity branch pipe 231 at the other end, flows through the cooler 4, and then returns to the liquid pump 3, and the coolant in the high-flow velocity pipeline 32 does not flow through the cooling plate 2;

[0042] When the temperature of a battery rises, the airbag rod 242 in the corresponding cooling plate 2 expands due to the heat, pushing the switching tube 23 to slide into the high-flow rate pipe 32 and connect with it. Compared with basic liquid cooling, a high-flow rate channel 22 is added for cooling on the basis of the low-flow rate channel 21, thereby improving the cooling efficiency of the cooling plate 2.

[0043] Embodiment 2: This embodiment differs from Embodiment 1 in that Figure 8As shown, the partition 236 is sealingly connected to the inner wall of the switching tube 23 for sliding up and down movement, the inner bottom of the high flow rate branch 232 is provided with a first wedge block 237 sealingly connected thereto, the partition 236 is provided with a second wedge block 238 in contact with the first wedge block 237, and the high flow rate branch 232 is provided with a spring rod 235 for automatically resetting the first wedge block 237; it can be understood that the highest position of the partition 236 cannot exceed the third through hole 211, the lowest position of the partition 236 cannot be lower than the fourth through hole 221, and the width of both sides of the first wedge block 237 can reach the length of the sliding sealing connection with the inner wall of the high flow rate branch 232 at most.

[0044] The working principle of this embodiment differs from that of embodiment 1 in that, after the switching tube 23 is connected to the high-flow-velocity pipeline 32, the water pressure pushes the first wedge block 237 to translate and move the partition 236 upward, thereby reducing the flow space of the low-flow-velocity branch pipe 231 and increasing its flow rate, thereby enhancing the cooling efficiency; the flow rate of the low-flow-velocity branch pipe 231 is adjusted by the connection state between the high-flow-velocity branch pipe 232 and the high-flow-velocity pipeline 32, and if the two branches are set independently, the low-flow-velocity branch pipe 231 cannot use the water pressure of the high-flow-velocity branch pipe 232 to adjust the low flow rate, and the high-flow-velocity branch pipe 232 cannot adjust its own flow rate state.

[0045] Embodiment 3: This embodiment differs from Embodiment 1 in that Fig. 9 As shown, a slide groove 12, a screw rod 121 rotatably connected to both ends of the slide groove 12, and a slider 122 threadedly sleeved with the screw rod 121 are provided on the side wall of one side of the battery compartment, and a clamping plate 123 is slidably provided on the slider 122, wherein the clamping plate 123 and the slider 122 are slidably connected using an existing self-locking telescopic rod structure (such as an umbrella rod telescopic structure), and a second air bag 126 is arranged on both sides of the clamping plate 123 and connected to the first air bag 125, and a clamping groove 124 for clamping with the second air bag 126 is provided on the side wall of the other side of the battery compartment, and an anti-slip sheet is provided at the end of the second air bag 126 to enhance the friction between it and the clamping groove 124, and the anti-slip sheet can be made of rubber.

[0046] The working principle of this embodiment is different from that of embodiment 1 in that after placing the battery in the battery compartment, the screw 121 is rotated to move the slider 122 to the upper surface of the battery, and then the snap-in plate 123 is pulled out to make the first airbag 125 contact and be squeezed with the slot 124, and the second airbag 126 is extended to squeeze and limit the anti-slip sheet with the side walls of the slot 124, then the snap-in is completed, and the snap-in plate 123 no longer moves up and down, thereby fixing the battery.

Claims

1. An integrated battery box based on a double-circulation liquid cooling system, characterized in that: The invention comprises a box body (1), a battery area arranged inside the box body (1), a low-flow-rate pipeline (31) and a high-flow-rate pipeline (32) surrounding the outside of the battery area in sequence from the inside to the outside, a cooler (4) and a liquid pump (3), wherein the battery area is provided with a plurality of cooling plates (2) for dividing the battery area into a plurality of battery compartments. The cooling plate (2) is provided with a plurality of alternately distributed low-flow channels (21) and high-flow channels (22), and both ends of the cooling plate (2) have through openings corresponding to the low-flow channels (21), and the through openings are provided with a switching tube (23) which is slidably sealed and connected to the low-flow channel (21) and is used to switch the high-flow pipeline (32) to connect with the high-flow channel (22) by sliding, and the low-flow channel (21) is provided with an airbag assembly (24) for driving the switching tube (23) to slide by utilizing the heat change of the battery.

2. The integrated battery box based on the double-circulation liquid cooling system according to claim 1 is characterized in that: One end of the switching tube (23) is sealed and slidingly sealed to penetrate the low flow rate pipeline (31) and is slidingly sealed to be connected to the high flow rate pipeline (32); the other end of the switching tube (23) is slidingly sealed to be connected to the low flow rate flow channel (21); the interior of the switching tube (23) is divided into a low flow rate branch pipe (231) and a high flow rate branch pipe (232) by a partition plate (236) at the top and bottom; the other end of the switching tube (23) has a third through hole (236) that is connected to the low flow rate branch pipe (231). 11), and the low flow rate branch pipe (23) is provided with a first through hole (233) communicating with the low flow rate pipeline (31), the side wall of the switching pipe (23) has a fourth through hole (221) communicating with the high flow rate branch pipe (232), the high flow rate flow channel (3) is provided with a fifth through hole (222) for slidingly communicating with the fourth through hole (221), and the high flow rate branch pipe (232) is provided with a second through hole (234) for slidingly communicating with the high flow rate pipeline (32).

3. The integrated battery box based on the double-circulation liquid cooling system according to claim 1 is characterized in that: The airbag assembly (24) comprises a plurality of heat-conducting sheets (241) embedded on the inner wall of the cooling plate (2) and a plurality of airbag rods (242) correspondingly connected to the heat-conducting sheets (241), wherein the airbag rods (242) are filled with any one of air, kerosene or industrial alcohol.

4. The integrated battery box based on the double-circulation liquid cooling system according to claim 2, characterized in that: The partition plate (236) is slidably and hermetically connected to the inner wall of the switching tube (23) up and down.

5. The integrated battery box based on the double-circulation liquid cooling system according to claim 4 is characterized in that: A first wedge block (237) is provided at the bottom of the high flow rate branch pipe (232) and is sealingly and slidably connected thereto, a second wedge block (238) is provided on the partition plate (236) and is in contact with the first wedge block (237), and a spring rod (235) is provided in the high flow rate branch pipe (232) for automatically resetting the first wedge block (237).

6. The integrated battery box based on the double-circulation liquid cooling system according to claim 1, characterized in that: A slide groove (12), a screw rod (121) rotatably connected to both ends of the slide groove (12), and a slider (122) threadedly sleeved with the screw rod (121) are provided on the side wall of one side of the battery compartment; a clamping plate (123) is slidably provided on the slider (122); a first airbag (125) and a second airbag (126) arranged on both sides of the clamping plate (123) and connected to the first airbag (125) are provided on the clamping plate (123); a clamping groove (124) clamped to the second airbag (126) is provided on the side wall of the other side of the battery compartment; and an anti-slip sheet is provided at the end of the second airbag (126) to enhance the friction between the second airbag (126) and the clamping groove (124).

7. The integrated battery box based on the double-circulation liquid cooling system according to claim 1, characterized in that: The box body (1) is made of aluminum alloy material, and the high-flow-rate pipeline (32) is provided with a plurality of heat-conducting rods (33) connected to the side wall of the battery compartment.

8. The integrated battery box based on a double-circulation liquid cooling system according to claim 1, characterized in that: The low-flow-rate flow channel (21) is wider than the high-flow-rate flow channel (22).

9. The integrated battery box based on a double-circulation liquid cooling system according to claim 1, characterized in that: A sealing sleeve (11) is provided between the low-flow-rate pipeline (31) and the high-flow-rate pipeline (32), and the sealing sleeve (11) is provided with a plurality of sealing holes for the switching tube (23) to slide.

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