High-voltage cascade battery pack with high cooling performance

Abstract

According to the high-voltage cascade battery pack with the high cooling performance, an insulating film is arranged in the middle of the bottom face of a liquid cooling bottom plate, a water inlet and a water outlet are formed in the bottom face of the liquid cooling bottom plate, a liquid cooling flow guide groove is formed in the liquid cooling bottom plate, and the liquid cooling flow guide groove comprises a water inlet flow channel, a water outlet flow channel, an outer side flow guide channel and an inner side flow guide channel; a plurality of flow guide partition plates parallel to the inner walls of the two sides of the flow channel are arranged in the outer side flow guide channel and the inner side flow guide channel, the outer side partition wall is arranged in the middle between the double-branch ends of the water inlet flow channel and the water outlet flow channel, and the inner side partition wall is arranged between the water inlet flow channel and the water outlet flow channel. The cover plate is improved into a liquid cooling inner cavity type flow channel internally provided with water inlet and outlet, so that circulating liquid cooling of the cover plate is realized, and the insulating film is arranged on the surface, adjacent to and in contact with the battery cell, of the bottom surface of the cover plate, so that liquid cooling circulating cooling can be realized, and the insulating and sealing effects of the cover plate can also be ensured.

Description

Technical Field

[0001] This article belongs to the technical field of immersion-cooled battery packs, and specifically relates to a high-voltage cascade battery pack with high cooling performance. Background Art

[0002] In recent years, as the capacity of energy storage cells has become larger and larger, the heat generated by a large number of integrated cells has also become larger and larger. The original air cooling technology can no longer meet the current product needs.

[0003] Liquid cooling technology is gradually replacing air cooling technology. Liquid cooling systems have high heat dissipation efficiency and small temperature differences between battery clusters, which greatly improves the life of the battery and the economy of the entire life cycle. The most common liquid cooling technology is cold plate liquid cooling, which is indirect liquid cooling, that is, the heating element and the cooling medium are not in direct contact. Cold plate liquid cooling dissipates heat by direct contact with a cold plate filled with liquid, or the heat is transferred to the cold plate by a heat-conducting component, and then the heat is removed by the liquid circulation inside the cold plate.

[0004] Moreover, the performance requirements for energy storage batteries are getting higher and higher. The heat generated by high-voltage battery packs will also be very serious. Therefore, it is necessary to be able to achieve effective and efficient cooling effects on high-voltage battery packs, and it is necessary to make better improvements to the cooling performance of battery packs. Summary of the invention

[0005] In order to solve the above problems, this paper proposes a high-cooling performance high-voltage cascade battery pack, the bottom of the battery pack is covered with a liquid-cooled base plate, the top of the liquid-cooled base plate is provided with a battery cell, an insulating film is provided between the middle of the liquid-cooled base plate and the battery cell, a water inlet and a water outlet are provided in a transverse and axially symmetrical manner on one side of the bottom surface of the liquid-cooled base plate, and a liquid-cooled guide groove is provided inside the liquid-cooled base plate, the liquid-cooled guide groove includes an inlet flow channel, an outlet flow channel, an outer guide channel and an inner guide channel, one end of the inlet flow channel and the outlet flow channel are respectively connected to the water inlet and the water outlet, the other end of the inlet flow channel and the outlet flow channel is double-branched and connected to the outer guide channel and the inner guide channel, the outer guide channel and the inner guide channel are double-branched, and the outer guide channel and the inner guide channel are double-branched. The inner guide channel is sealed and divided into a transverse U-shaped guide channel by an outer partition wall and an inner partition wall. The interiors of the outer guide channel and the inner guide channel are both provided with a number of guide baffles parallel to the inner walls on both sides of the channel. The outer partition wall is arranged in the middle between the double branch ends of the water inlet channel and the water outlet channel, and the inner partition wall is arranged between the water inlet channel and the water outlet channel. The battery pack cover plate, which was originally simply sealed, is improved to a liquid-cooled inner cavity flow channel with water inlet and outlet, thereby realizing circulating liquid cooling of the cover plate, and an insulating film is arranged on the bottom surface of the cover plate that is adjacent to the battery cell, so that not only can liquid cooling circulation cooling be achieved, but also the insulating sealing effect of the cover plate can be ensured.

[0006] A plurality of battery cells are arranged in an array at equal intervals inside the battery pack. The battery cells are small-capacity battery cells. Mica sheets are provided between each row of battery cells. The bottom surface of the battery cells is connected to the liquid-cooled bottom plate through an insulating film. An active equalizer is provided at one end of each group of battery cells, and a connecting wire is provided at the other end of each group of battery cells. Fuses are provided between the ends of the plurality of connecting wires. Mica sheets are used as separators between the battery cells, which have good heat insulation effect and prevent high temperature from spreading to surrounding battery cells when the battery cells are thermally runaway. Mica sheets are used to separate the sides of all battery cells in the battery module from other battery cells or aluminum end plates. The heat between the battery cells is not conducted to each other, and only the bottom can quickly release heat to the liquid cooling plate. The unified heat dissipation measures ensure better battery cell consistency during charging and discharging.

[0007] The shape of the liquid cooling base plate is a rectangular cover plate with a hollow interior. Both ends of the bottom insulating membrane of the liquid cooling base plate are provided with pressure strips, and both sides of the water inlet and outlet of the liquid cooling base plate are provided with interface pads on the outside. The pressure strips and interface pads are fixedly connected to the bottom surface of the liquid cooling base plate by bolts. By providing not only pressure strips but also interface pads on the bottom surface of the rectangular liquid cooling base plate, not only the two ends of the insulating membrane are pressed and fixed, but also the water inlet and outlet can be supported and protected on both sides of the outside when the cover plate is installed to prevent damage to the water inlet and outlet.

[0008] The water inlet and the water outlet are both conductive round tube interfaces, which are vertically arranged on the bottom surface of the liquid-cooled base plate. The water inlet and the water outlet are vertically conductive and mutually conductive with the inside of the liquid-cooled base plate. By arranging the conductive water inlet and the water outlet on the bottom surface of the liquid-cooled base plate, it is convenient to connect the circulating coolant from the outside of the cover plate, thereby ensuring continuous circulation and cooling of the liquid-cooled base plate.

[0009] The water inlet and outlet are divided into two rectangular guide channels, and both the water inlet and outlet channels are connected to the inner cavity of the liquid-cooled base plate through the ends of the two branches. The one-to-two water inlet and outlet channels can connect the cavity inside the liquid-cooled base plate with the outer guide channel and the inner guide channel, so as to facilitate the realization of efficient and stable guide liquid cooling circulation inside the liquid-cooled base plate and fully improve the cooling effect of the coolant.

[0010] A hollow inner cavity is provided inside the liquid-cooled base plate, and the shape of the hollow inner cavity is rectangular. The size and position of the hollow inner cavity are the same as the position of the insulating film. The left side of the hollow inner cavity is connected to the water inlet and the water outlet through the water inlet channel and the water outlet channel. The interior of the hollow inner cavity is partitioned in a transverse U-shape by the outer partition wall and the inner partition wall to provide an outer guide channel and an inner guide channel. By setting a partition wall in the hollow inner cavity originally inside the liquid-cooled base plate, two transverse U-shaped inlet and outlet guides are separated, and a plurality of guide baffles are also set in the guide channel to increase the contact surface of the coolant with the cover plate, thereby improving the cooling effect.

[0011] The shape of the outer partition wall is a transverse combined U-shaped wall with an opening on the right, the inner side of the outer partition wall is connected to the inner guide channel, the outer side of the outer partition wall is connected to the outer guide channel, and the front and rear sides of the outer partition wall are both horizontally and horizontally provided with transverse outer walls in parallel, one end of the transverse outer walls on both sides is connected to the middle of the double branches of the water inlet flow channel or the water outlet flow channel, and the other ends of the transverse outer walls on both sides are connected to each other through the longitudinal outer walls, and the inner partition wall is a straight transverse inner wall, and the inner partition wall is horizontally arranged between the water inlet flow channel and the water outlet flow channel One end of the inner partition wall is sealed and connected to the transverse centerline interval between the water inlet flow channel and the water outlet flow channel, and a conduction interval is provided between the other end of the inner partition wall and the outer partition wall. The width of the conduction interval is the same as the spacing between the inner partition wall and the outer partition wall. The outer partition wall and the inner partition wall are used to separate the originally large-area hollow cavity, and a smooth inlet and outlet guide channel effect is achieved, thereby achieving sufficient contact area and release time of the coolant with the cover plate, thereby improving the liquid cooling effect of the coolant.

[0012] Several battery cells are connected in series to form a battery module, and the battery modules are connected end to end to form a battery module. Each battery module is equipped with an active balancer, which has a better balancing effect on the battery cells; the battery module bears the weight of the sheet metal and the liquid cooling plate together, and the overall rigidity is better; a fuse is configured in the battery module, which can quickly cut off the circuit in case of a short circuit; the plug-in type has external power output; the air-suction fire-fighting can be led to the detection device through an insulating pipe, which is suitable for a high-voltage cascade environment; all externally assembled parts, such as the liquid cooling plate, upper cover, panel, etc., are provided with compressible silicone foam to achieve a high protection effect.

[0013] Beneficial effects:

[0014] The battery pack cover, which was originally simply sealed, is improved into a liquid-cooled inner cavity flow channel with water inlet and outlet, thereby realizing circulating liquid cooling of the cover, and an insulating film is arranged on the bottom surface of the cover that is adjacent to the battery cell, which not only realizes liquid cooling circulation and cooling, but also ensures the insulating sealing effect of the cover.

[0015] Mica sheets are used as separators between battery cells, which have good insulation effects and prevent high temperatures from spreading to surrounding battery cells when the battery cells are in thermal runaway. Mica sheets are used to separate the sides of all battery cells in the battery module from other battery cells or aluminum end plates. The heat between the battery cells is not conducted to each other, and only the bottom can quickly release heat to the liquid cooling plate. The unified heat dissipation measures ensure better battery consistency during charging and discharging.

[0016] By not only arranging a pressure strip but also an interface pad on the bottom surface of the rectangular liquid cooling base plate, not only the two ends of the insulating film are pressed and fixed, but also the water inlet and the water outlet can be supported and protected on both sides of the outside when the cover plate is installed to prevent damage to the water inlet and the water outlet.

[0017] By arranging a conductive water inlet and outlet on the bottom surface of the liquid cooling base plate, the circulating coolant can be conveniently connected from the outside of the cover plate, thereby ensuring continuous circulation and cooling of the liquid cooling base plate.

[0018] Through the one-to-two water inlet channel and water outlet channel, the cavity inside the liquid-cooled base plate can be connected with the outer guide channel and the inner guide channel, so that efficient and stable guide liquid cooling circulation can be realized inside the liquid-cooled base plate, and the cooling effect of the coolant can be fully improved.

[0019] By setting a partition wall in the hollow inner cavity of the original liquid-cooled base plate, two horizontal U-shaped inlet and outlet flow guides are separated, and multiple guide baffles are also set in the guide channel to increase the contact area of ​​the coolant with the cover plate, thereby improving the cooling effect.

[0020] The outer partition wall and the inner partition wall are used to separate the originally large hollow cavity, thereby achieving a smooth in-and-out flow guide effect, thereby ensuring that the coolant can fully contact the cover plate and the release time, thereby improving the liquid cooling effect of the coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a high-voltage cascade battery pack with high cooling performance

[0022] Figure 2 It is a schematic diagram of the bottom surface of a liquid cooling base plate of a high-voltage cascade battery pack with high cooling performance;

[0023] Figure 3 It is a schematic diagram of the internal cross section of a liquid cooling base plate of a high-voltage cascade battery pack with high cooling performance;

[0024] In the figure; 1. liquid cooling base plate, 2. interface pad, 3. pressure strip, 4. insulation film, 5. water inlet, 6. water outlet, 7. water inlet channel, 8. water outlet channel, 9. outer guide channel, 10. inner guide channel, 11. outer partition wall, 12. inner partition wall, 13. battery cell, 14. mica sheet, 15. active equalizer, 16. connecting wires, 17. fuse. DETAILED DESCRIPTION

[0025] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0026] Liquid cooling base plate 1, interface pad 2, pressure strip 3, insulating film 4, water inlet 5, water outlet 6, water inlet channel 7, water outlet channel 8, outer guide channel 9, inner guide channel 10, outer partition wall 11, inner partition wall 12, battery cell 13, mica sheet 14, active equalizer 15, connecting wire 16, fuse 17.

[0027] like Figure 1 , 2 Show;

[0028] A high-voltage cascade battery pack with high cooling performance, wherein the bottom surface of the battery pack is covered with a liquid-cooled bottom plate, a battery cell 13 is arranged above the liquid-cooled bottom plate 1, an insulating film 4 is arranged between the middle of the liquid-cooled bottom plate 1 and the battery cell 13, a water inlet 5 and a water outlet 6 are arranged in a transverse axially symmetrical manner on one side of the bottom surface of the liquid-cooled bottom plate 1, and a liquid-cooled guide groove is arranged inside the liquid-cooled bottom plate 1, wherein the liquid-cooled guide groove comprises a water inlet flow channel 7, a water outlet flow channel 8, an outer guide channel 9 and an inner guide channel 10, one end of the water inlet flow channel 7 and the water outlet flow channel 8 are respectively connected to the water inlet 5 and the water outlet 6, and the other end of the water inlet flow channel 7 and the water outlet flow channel 8 is double-branched and connected to the outer guide channel 9 and the inner guide channel 10, and the outer guide channel 9 and the inner guide channel 10 are connected to the outer guide channel 9 and the inner guide channel 10. The conducting flow channel is sealed and divided into a transverse U shape by an outer partition wall 11 and an inner partition wall 12. The inner parts of the outer guide channel 9 and the inner guide channel 10 are provided with a plurality of guide baffles parallel to the inner walls on both sides of the flow channel. The battery pack is provided with a plurality of battery cells arranged in an array at equal intervals. The battery cells are small-capacity battery cells. Mica sheets are provided between each row of battery cells. The bottom surface of the battery cells is connected to the liquid cooling bottom plate through an insulating film. An active equalizer is provided at one end of each group of battery cells, and a connecting wire is provided at the other end of each group of battery cells. A fuse is provided between the ends of the plurality of connecting wires. The outer partition wall 11 is provided in the middle between the double branch ends of the water inlet flow channel 7 and the water outlet flow channel 8. The inner partition wall 12 is provided between the water inlet flow channel 7 and the water outlet flow channel 8. The shape of the liquid-cooling bottom plate 1 is a rectangular cover plate with a hollow interior. Both ends of the bottom insulating film 4 of the liquid-cooling bottom plate 1 are provided with pressure strips 3. The outside of the water inlet 5 and the water outlet 6 of the liquid-cooling bottom plate 1 are provided with interface pads 2 on both sides. The pressure strips 3 and the interface pads 2 are fixedly connected to the bottom surface of the liquid-cooling bottom plate 1 by bolts. The water inlet 5 and the water outlet 6 are both conductive round pipe interfaces. The water inlet 5 and the water outlet 6 are vertically arranged on the bottom surface of the liquid-cooling bottom plate 1. The water inlet 5 and the water outlet 6 are vertically conductive and mutually conductive with the interior of the liquid-cooling bottom plate 1. The water inlet flow channel 7 and the water outlet flow channel 8 are divided into two rectangular conductive flow channels. The water inlet flow channel 7 and the water outlet flow channel 8 are connected to the inner cavity of the liquid-cooling bottom plate 1 through the ends of the two branches. The interior of the liquid-cooling bottom plate 1 is provided with a hollow inner The hollow inner cavity is in the shape of a rectangle, and the size and position of the hollow inner cavity are the same as the position of the insulating film 4. The left side of the hollow inner cavity is connected to the water inlet 5 and the water outlet 6 through the water inlet channel 7 and the water outlet channel 8. The interior of the hollow inner cavity is divided into an outer guide channel 9 and an inner guide channel 10 in a transverse U-shaped partition through an outer partition wall 11 and an inner partition wall 12. The shape of the outer partition wall 11 is a transverse combined U-shaped wall with an opening on the right. The inner side of the outer partition wall 11 is connected to the inner guide channel 10, and the outer side of the outer partition wall 11 is connected to the outer guide channel 9. The front and rear sides of the outer partition wall 11 are both horizontally and parallelly provided with transverse outer walls, and one end of the transverse outer walls on both sides is connected to the middle of the double branches of the water inlet channel 7 or the water outlet channel 8.The other ends of the transverse outer walls on both sides are connected to each other through the longitudinal outer walls. The inner partition wall 12 is a straight transverse inner wall. The inner partition wall 12 is horizontally arranged between the water inlet flow channel 7 and the water outlet flow channel 8. One end of the inner partition wall 12 is sealed and connected to the transverse midline interval between the water inlet flow channel 7 and the water outlet flow channel 8. A conduction interval is arranged between the other end of the inner partition wall 12 and the outer partition wall 11. The width of the conduction interval is the same as the spacing between the inner partition wall 12 and the outer partition wall 11.

[0029] Implementation examples;

[0030] When in use, the coolant is poured into the water inlet 5 through the pipeline and discharged from the water outlet 6. The coolant first passes through the water inlet channel 7 and is divided into two and flows into the outer guide channel 9 and the inner guide channel 10 respectively. The coolant passes through the outer partition wall 11 and the inner partition wall 12 set in the outer guide channel 9 and the inner guide channel 10 to achieve a horizontal U-shaped diversion, and the diversion baffles set inside the outer guide channel 9 and the inner guide channel 10 can not only achieve auxiliary diversion, but also increase the contact area of ​​the coolant, thereby improving the cooling effect of the coolant. Finally, the coolant is discharged from the water outlet 6 from the water outlet channel 8 in a two-in-one manner to complete the liquid cooling cycle.

[0031] The insulating film 4 provided on the bottom surface of the liquid-cooled base plate 1 and the adjacent contact surface of the battery cell can effectively absorb heat and assist in transferring heat to the internal coolant for liquid cooling circulation during the discharge and heat release process of the battery cell, and can also play an insulating role to ensure the insulation effect of the outer surface of the cover plate.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-voltage cascade battery pack with high cooling performance, the bottom surface of the battery pack is covered with a liquid cooling bottom plate, characterized in that: A battery cell is arranged above the liquid-cooling base plate, an insulating film is arranged between the middle part of the liquid-cooling base plate and the battery cell, a water inlet and a water outlet are arranged on one side of the bottom surface of the liquid-cooling base plate in a transverse axial symmetric manner, and a liquid-cooling guide groove is arranged inside the liquid-cooling base plate, the liquid-cooling guide groove comprises a water inlet channel, a water outlet channel, an outer guide channel and an inner guide channel, one end of the water inlet channel and the water outlet channel are respectively connected to the water inlet and the water outlet, the other end of the water inlet channel and the water outlet channel are connected to the outer guide channel and the inner guide channel in a double-branched manner, the outer guide channel and the inner guide channel are sealed and separated into a transverse U-shaped conducting channel by an outer partition wall and an inner partition wall, and a plurality of guide baffles are arranged inside the outer guide channel and the inner guide channel in parallel with the inner walls on both sides of the channel, the outer partition wall is arranged in the middle between the double-branched ends of the water inlet channel and the water outlet channel, and the inner partition wall is arranged between the water inlet channel and the water outlet channel.

2. A high-voltage cascade battery pack with high cooling performance according to claim 1, characterized in that: The battery pack has a plurality of battery cells arranged in an array at equal intervals inside. The battery cells are small-capacity battery cells. Mica sheets are provided between each row of battery cells. The bottom surface of the battery cells is bonded to the liquid-cooled bottom plate through an insulating film. An active equalizer is provided at one end of each group of battery cells, and a connecting wire is provided at the other end of each group of battery cells. Fuses are provided between the ends of the plurality of connecting wires.

3. A high-voltage cascade battery pack with high cooling performance according to claim 1, characterized in that: The shape of the liquid cooling base plate is a rectangular cover plate with a hollow interior. Both ends of the bottom insulating film of the liquid cooling base plate are provided with pressure strips, and the outside of both sides of the water inlet and outlet of the liquid cooling base plate are provided with interface pads. The pressure strips and interface pads are fixedly connected to the bottom surface of the liquid cooling base plate by bolts.

4. A high-voltage cascade battery pack with high cooling performance according to claim 1, characterized in that: The water inlet and outlet are both conductive round pipe interfaces, which are vertically arranged on the bottom surface of the liquid cooling base plate, and are vertically conductively connected to the inside of the liquid cooling base plate.

5. A high-voltage cascade battery pack with high cooling performance according to claim 1, characterized in that: The water inlet flow channel and the water outlet flow channel are divided into two rectangular conductive flow channels, and the water inlet flow channel and the water outlet flow channel are both connected to the inner cavity of the liquid cooling base plate through the ends of the two branches.

6. A high-voltage cascade battery pack with high cooling performance according to claim 1, characterized in that: A hollow inner cavity is provided inside the liquid cooling base plate, and the shape of the hollow inner cavity is rectangular. The size and position of the hollow inner cavity are the same as the position of the insulating film. The left side of the hollow inner cavity is connected to the water inlet and the water outlet through the water inlet channel and the water outlet channel. The interior of the hollow inner cavity is horizontally U-shapedly divided by the outer partition wall and the inner partition wall to provide an outer guide channel and an inner guide channel.

7. A high-voltage cascade battery pack with high cooling performance according to claim 1, characterized in that: The shape of the outer partition wall is a transverse combined U-shaped wall with an opening on the right, the inner side of the outer partition wall is connected to the inner guide channel, the outer side of the outer partition wall is connected to the outer guide channel, and the front and rear sides of the outer partition wall are both horizontally and parallelly provided with transverse outer walls, one end of the transverse outer walls on both sides is connected to the middle part of the double branches of the water inlet channel or the water outlet channel, and the other ends of the transverse outer walls on both sides are connected to each other through the longitudinal outer walls.

8. The high-voltage cascade battery pack with high cooling performance according to claim 1, characterized in that: The inner partition wall is a straight transverse inner wall, which is horizontally arranged between the water inlet channel and the water outlet channel. One end of the inner partition wall is sealed and connected to the transverse centerline interval between the water inlet channel and the water outlet channel. A conduction interval is provided between the other end of the inner partition wall and the outer partition wall, and the width of the conduction interval is the same as the spacing between the inner partition wall and the outer partition wall.

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