Square aluminum shell solid-state battery with stable heat dissipation

Abstract

The invention relates to the technical field of batteries, in particular to a stable-heat-dissipation square aluminum shell solid-state battery which comprises a solid-state battery cell and a square aluminum shell wrapping the solid-state battery cell, a side wall clamping cavity is formed in the square aluminum shell, the two sides of the side wall clamping cavity are through, a cylindrical heat conductor is integrally and fixedly arranged in the side wall clamping cavity, and the cylindrical heat conductor is arranged in the square aluminum shell. A plurality of groups of cylindrical heat conductors are arranged and are arranged in a linear array manner; according to the square aluminum shell solid-state battery disclosed by the invention, the side wall clamping cavity, the cylindrical heat conductor, the side blowing fan and other structures are matched, so that the battery can be stably cooled, and meanwhile, the square aluminum shell solid-state battery has higher supporting and protecting strength.

Description

Technical Field

[0001] The invention relates to the technical field of batteries, and in particular to a square aluminum shell solid-state battery with stable heat dissipation. Background Art

[0002] Aluminum shell solid-state battery is a battery that uses a metal aluminum shell as an outer package and a solid electrolyte inside. The aluminum shell as the outer shell of the battery has high strength and good sealing, which can provide protection for the battery cells and solid electrolyte inside the battery from the influence of the external environment; the traditional square-packaged aluminum shell solid-state battery has a large square surface that is easy to deform, which can easily squeeze the solid-state battery cell and cause the battery cell to break. In addition, heat can only be transferred to the outside through the aluminum shell. The aluminum shell cannot actively cool down the battery when the temperature rises abnormally, and the heat dissipation performance is insufficient. Summary of the invention

[0003] The purpose of the present invention is to provide a square aluminum shell solid-state battery with stable heat dissipation to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a square aluminum shell solid-state battery with stable heat dissipation, comprising a solid-state battery cell and a square aluminum shell wrapped around the outside of the solid-state battery cell, the square aluminum shell is provided with a side wall cavity inside, the two sides of the side wall cavity penetrate through, the inside of the side wall cavity is integrally fixedly provided with a cylindrical heat conductor, the number of the cylindrical heat conductors is several groups, and they are arranged in a linear array, a side blowing fan is embedded and fixed on one side of the square aluminum shell, the side blowing fan can drive the airflow through the inside of the side wall cavity when running, the inside of the cylindrical heat conductor is correspondingly provided with a gas storage cavity, a convex portion is integrally fixedly provided on the surface of the square aluminum shell, an intercommunication inner cavity is provided inside the convex portion, the intercommunication inner cavity is connected with the gas storage cavity, the gas storage cavity is filled with compressed gas, and an automatic valve structure is provided at the inside and outside of the intercommunication inner cavity, when the abnormal temperature of the solid-state battery cell reaches a set threshold, the automatic valve structure can be opened to release the compressed gas in the gas storage cavity.

[0005] The automatic valve structure includes an inner wall matching ring, an air-sealing plug and a control top shaft. The inner wall matching ring is fixedly arranged on the inner wall surface of the interconnected inner cavity. The air-sealing plug is arranged below the inner wall matching ring. When the air-sealing plug moves upward, it can contact and cooperate with the inner wall matching ring to close the interconnected inner cavity. The air-sealing plug is fixedly installed with the control top shaft. One end of the control top shaft away from the air-sealing plug passes through the side wall of the raised portion and extends to the outside of the raised portion. The control top shaft is in airtight contact with the raised portion.

[0006] A spring support disk is fixedly provided on the surface of the control top shaft, and a vent hole is opened through the surface of the spring support disk. A normally closed spring is provided below the spring support disk, and the normally closed spring provides an elastic supporting force so that the air-sealed blockage has an elastic tendency to move upward. An external synchronous connecting rod is fixedly provided at one end of the control top shaft outside the raised portion.

[0007] An independent closed air cavity is opened in the side wall of the square aluminum shell, and a cylindrical through groove is opened outside the independent closed air cavity. A cylindrical piston is inserted inside the cylindrical through groove, and the cylindrical piston is in airtight contact with the cylindrical through groove.

[0008] One end of the external synchronous connecting rod is located below the cylindrical piston. When the temperature of the solid-state battery cell abnormally rises to a set threshold, the gas in the independent closed air cavity will expand due to the heat, pushing the cylindrical piston downward. The cylindrical piston pushes the external synchronous connecting rod downward, driving the air seal to move downward and open.

[0009] An electrode contact plate is fixedly arranged on the upper surface of the square aluminum shell, and the solid-state battery cell supplies power to the outside through the electrode contact plate. A split contact plate is arranged above the electrode contact plate, and an insulating bracket is fixedly arranged on the upper surface of the square aluminum shell, and the insulating bracket fixes and supports the split contact plate.

[0010] A bridging spring is arranged between the electrode contact plate and the split contact plate, the electrode contact plate is connected to the split contact plate through the bridging spring, a fixed support is fixedly arranged on the bridging spring, an insulating shaft moving plate is arranged between the electrode contact plate and the split contact plate, and the fixed support is inserted and fixed in the insulating shaft moving plate.

[0011] A top boss is fixedly arranged on the upper surface of the square aluminum shell, a driving cavity is opened in the top boss, a driving piston is slidably arranged in the driving cavity, and the driving piston is in airtight contact with the driving cavity.

[0012] A connecting square rod is fixedly provided on one side of the driving piston, and the connecting square rod is fixedly connected to the insulating shaft moving plate. A return spring is provided on the side of the driving piston facing the connecting square rod, and the return spring applies an axial return elastic force to the driving piston.

[0013] An input airflow channel is provided at the end of the driving cavity, and the other end of the input airflow channel is connected to the interconnected inner cavity. A return outer tube is provided at the side wall of the driving cavity, and the other end opening of the return outer tube is located between the side-blowing fan and the square aluminum shell.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The square aluminum shell solid-state battery of the present invention can stably dissipate heat for the battery through the coordination of structures such as the side wall cavity, the cylindrical heat conductor and the side-blowing fan, while having higher supporting and protective strength.

[0015] The present invention cooperates with the split contact plate, the insulating shaft plate and other structures by setting an automatic valve structure, which can directly disconnect the conductive connection between the battery and the external equipment from a mechanical level when the battery heats up abnormally, prevent the battery from continuing to charge or discharge, avoid more energy input or output, and reduce the risk of thermal runaway; at the same time, it can forcibly reduce the temperature of the square aluminum shell, further suppress the risk of thermal runaway by active cooling, and through the return outer pipe, the low-temperature gas doing work externally can be returned to between the side-blowing fan and the square aluminum shell, so that the side-blowing fan blows the low-temperature gas through the side wall cavity, thereby further realizing cooling protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the overall structure of the present invention from another angle.

[0018] Figure 3 It is a three-dimensional half-section schematic diagram of the split contact plate of the present invention.

[0019] Figure 4 for Figure 3 A magnified schematic diagram of area A in the middle.

[0020] Figure 5 It is a schematic diagram of separating the side-blowing fan of the present invention.

[0021] Figure 6 It is a three-dimensional half-section schematic diagram of the independent closed air cavity of the present invention.

[0022] Figure 7 for Figure 6 Enlarged schematic diagram of area B in the middle.

[0023] Figure 8 for Figure 6 Enlarged schematic diagram of area C in the middle.

[0024] Fig. 9 It is a three-dimensional half-section schematic diagram of the top boss of the present invention.

[0025] Fig.10 for Fig. 9 Enlarged schematic diagram of area D in the middle.

[0026] Fig.11 It is a horizontal half-section schematic diagram of the top boss of the present invention.

[0027] Fig.12 for Fig.11Enlarged schematic diagram of area E in the middle.

[0028] In the figure: 1, solid-state battery cell; 2, square aluminum shell; 3, side wall cavity; 4, cylindrical heat conductor; 5, side blowing fan; 6, air storage cavity; 7, raised part; 8, interconnected inner cavity; 801, inner wall matching ring; 802, air-tight plug; 803, control top shaft; 804, spring support plate; 805, vent hole; 806, normally closed spring; 807, external synchronous connecting rod; 808, independent closed air cavity; 809, cylindrical through groove; 810, cylindrical piston; 201, electrode contact plate; 202, split contact plate; 203, insulating bracket; 204, bridging spring; 205, fixed support plate; 206, insulating shaft moving plate; 207, top boss; 208, drive cavity; 209, drive piston; 210, connecting square rod; 211, reset spring; 212, input air flow channel; 213, return outer tube. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figures 1 to 12 The present invention provides a technical solution: a square aluminum shell solid-state battery with stable heat dissipation, such as Figure 4 and Figure 5 As shown in the figure, it includes a solid-state battery core 1 and a square aluminum shell 2 wrapped around the outside of the solid-state battery core 1. A side wall cavity 3 is provided inside the square aluminum shell 2. Both sides of the side wall cavity 3 are penetrated. A cylindrical heat conductor 4 is fixedly arranged inside the side wall cavity 3. There are several groups of cylindrical heat conductors 4, which are arranged in a linear array. A side blowing fan 5 is embedded and fixed on one side of the square aluminum shell 2. The side blowing fan 5 can drive the airflow to pass through the inside of the side wall cavity 3 when it is running. An air storage cavity 6 is correspondingly provided inside the cylindrical heat conductor 4. A protrusion 7 is fixedly provided on the surface of the square aluminum shell 2. An interconnecting inner cavity 8 is provided inside the protrusion 7. A one-way inflation hole can be provided outside the interconnecting inner cavity 8. Compressed air can be input into the air storage cavity 6 through the inflation hole, so that after the compressed gas in the air storage cavity 6 is consumed, it can be refilled for recycling. The above-mentioned one-way inflation hole is a common structure in the prior art and will not be repeated in this application.

[0031] The interconnected inner cavity 8 is interconnected with the gas storage cavity 6, and the gas storage cavity 6 is filled with compressed gas. Automatic valve structures are arranged inside and outside the interconnected inner cavity 8. When the temperature of the solid-state battery cell 1 abnormally rises and reaches a set threshold, the automatic valve structure can be opened to release the compressed gas in the gas storage cavity 6.

[0032] like Figure 7 As shown in the figure, the automatic valve structure includes an inner wall matching ring 801, an air-sealing plug 802 and a control top shaft 803. The inner wall matching ring 801 is fixedly arranged on the inner wall surface of the interconnecting inner cavity 8, and the air-sealing plug 802 is arranged below the inner wall matching ring 801. When the air-sealing plug 802 moves upward, it can contact and cooperate with the inner wall matching ring 801 to close the interconnecting inner cavity 8. The air-sealing plug 802 and the control top shaft 803 are fixedly installed. The end of the control top shaft 803 away from the air-sealing plug 802 is inserted through the side wall of the protrusion 7 and extends to the outside of the protrusion 7. The control top shaft 803 is in airtight contact with the protrusion 7.

[0033] A spring support disk 804 is fixedly provided on the surface of the control top shaft 803, and a vent hole 805 is opened through the surface of the spring support disk 804. A normally closed spring 806 is provided below the spring support disk 804. The normally closed spring 806 provides an elastic supporting force so that the air-sealing plug 802 has an elastic tendency to move upward. An external synchronization connecting rod 807 is fixedly provided at one end of the control top shaft 803 outside the raised portion 7.

[0034] An independent closed air cavity 808 is opened in the side wall of the square aluminum shell 2, and a cylindrical through groove 809 is opened outside the independent closed air cavity 808, and a cylindrical piston 810 is inserted into the cylindrical through groove 809, and the cylindrical piston 810 is in airtight contact with the cylindrical through groove 809.

[0035] One end of the external synchronization connecting rod 807 is located below the cylindrical piston 810. When the temperature of the solid-state battery cell 1 abnormally rises to a set threshold, the gas in the independent closed air cavity 808 will expand due to the heat, pushing the cylindrical piston 810 downward. The cylindrical piston 810 pushes the external synchronization connecting rod 807 downward, driving the air-tight plug 802 to move downward and open.

[0036] An electrode contact plate 201 is fixedly provided on the upper surface of the square aluminum shell 2, and the solid-state battery cell 1 supplies power to the outside through the electrode contact plate 201. A split contact plate 202 is provided above the electrode contact plate 201. An insulating bracket 203 is fixedly provided on the upper surface of the square aluminum shell 2, and the insulating bracket 203 fixes and supports the split contact plate 202.

[0037] A bridge spring 204 is provided between the electrode contact plate 201 and the split contact plate 202. The electrode contact plate 201 is connected to the split contact plate 202 through the bridge spring 204. A fixed support 205 is fixedly provided on the bridge spring 204. An insulating shaft moving plate 206 is provided between the electrode contact plate 201 and the split contact plate 202. The fixed support 205 is inserted and fixed in the insulating shaft moving plate 206. Fig.10 As shown in , both ends of the bridge spring piece 204 are provided with guiding arcs, which can play a guiding and compressing role when the bridge spring piece 204 is reset and moved between the electrode contact plate 201 and the split contact plate 202 .

[0038] A top boss 207 is fixedly provided on the upper surface of the square aluminum shell 2 . A driving cavity 208 is provided in the top boss 207 . A driving piston 209 is slidably provided in the driving cavity 208 . The driving piston 209 is in airtight contact with the driving cavity 208 .

[0039] A connecting square rod 210 is fixedly provided on one side of the driving piston 209 , and the connecting square rod 210 is fixedly connected to the insulating shaft moving plate 206 . A return spring 211 is provided on the side of the driving piston 209 facing the connecting square rod 210 , and the return spring 211 applies an axial return elastic force to the driving piston 209 .

[0040] The end of the driving cavity 208 is connected to an input flow channel 212, and the other end of the input flow channel 212 is connected to the interconnecting inner cavity 8. Figure 7 As shown in , the communication port between the input flow channel 212 and the interconnecting inner cavity 8 is located above the inner wall matching ring 801 , so that when the air-tight plug 802 and the inner wall matching ring 801 are matched and closed, gas will not enter the input flow channel 212 .

[0041] A return outer tube 213 is provided in communication with the side wall of the driving cavity 208 , and the other end opening of the return outer tube 213 is located between the side-blowing fan 5 and the square aluminum shell 2 .

[0042] When the square aluminum shell solid-state battery of the present invention is in use, it is connected to the split contact plate 202 for external discharge or charging, and the solid-state battery cell 1 is connected to the split contact plate 202 through the electrode contact plate 201 and the bridging spring 204 .

[0043] When the battery generates heat during high-power charging and discharging, the side-blowing fan 5 drives the airflow through the side wall cavity 3 to dissipate heat for the square aluminum shell 2. At the same time, through the structural settings of the side wall cavity 3 and the cylindrical heat conductor 4, the supporting strength of the larger square surface can be increased, the stress deformation can be reduced, and the solid-state battery cell 1 can be better protected.

[0044] When the temperature of the solid-state battery cell 1 abnormally rises to a preset threshold, the heat is transferred to the independent closed air cavity 808 through the square aluminum shell 2, causing the gas in the independent closed air cavity 808 to expand due to the heat. Figure 8 As shown in , the cylindrical piston 810 is driven to move downward, thereby pushing the external synchronous connecting rod 807 downward; Figure 7 As shown in the figure, when the external synchronous connecting rod 807 moves downward, it can drive the control top shaft 803 and the air-blocking plug 802 to move downward. At this time, the compressed gas in the air storage chamber 6 enters the driving chamber 208 through the interconnected inner cavity 8, the vent hole 805 and the input air flow channel 212 in sequence.

[0045] like Fig.10 and Fig.12 As shown in , the air pressure drives the driving piston 209 to move axially, driving the insulating shaft moving plate 206 to move axially, so that the bridging spring 204 is removed from between the electrode contact plate 201 and the split contact plate 202. At this time, the connection between the electrode contact plate 201 and the split contact plate 202 is cut off, and the conductive connection between the battery and the external device is directly disconnected from the mechanical level, preventing the battery from continuing to charge or discharge, avoiding more energy input or output, and reducing the risk of thermal runaway; when the driving piston 209 moves to a certain position, the compressed gas in the driving cavity 208 will enter the return outer tube 213, and will be ejected through the other end of the return outer tube 213, and will return to between the side-blowing fan 5 and the square aluminum shell 2, as shown in FIG. Figure 6 as shown in .

[0046] In the above process, the compressed gas in the gas storage chamber 6 is released, and the gas expands to do work externally, which reduces its internal energy and lowers its temperature, thereby actively cooling the cylindrical heat conductor 4 and the square aluminum shell 2, and forcibly cooling the battery. At the same time, the low-temperature gas ejected from the return outer tube 213 is inserted between the side-blowing fan 5 and the square aluminum shell 2, so that the side-blowing fan 5 blows the low-temperature gas through the side wall cavity 3, further achieving cooling protection. In order to ensure the active cooling effect of the square aluminum shell 2, the compressed gas filled in the gas storage chamber 6 has sufficient pressure, and gases such as carbon dioxide with a large specific heat capacity can be used preferentially, which can absorb more heat after expansion and have a flame retardant effect.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A square aluminum shell solid-state battery with stable heat dissipation, comprising a solid-state battery core (1) and a square aluminum shell (2) covering the outside of the solid-state battery core (1), characterized in that: The square aluminum shell (2) has a side wall cavity (3) formed inside, and the two sides of the side wall cavity (3) are penetrated, and a cylindrical heat conductor (4) is fixedly arranged inside the side wall cavity (3), and the cylindrical heat conductors (4) are provided in a plurality of groups and arranged in a linear array, and a side blowing fan (5) is embedded and fixed on one side of the square aluminum shell (2), and the side blowing fan (5) can drive airflow to pass through the inside of the side wall cavity (3) when in operation, and the inside of the cylindrical heat conductor (4) has a corresponding The surface of the square aluminum shell (2) is integrally fixedly provided with a protrusion (7), the protrusion (7) is provided with an interconnecting inner cavity (8) inside, the interconnecting inner cavity (8) is communicated with the gas storage cavity (6), the gas storage cavity (6) is filled with compressed gas, and automatic valve structures are provided at the inside and outside of the interconnecting inner cavity (8), and when the temperature of the solid-state battery cell (1) abnormally rises to a set threshold, the automatic valve structure can be opened to release the compressed gas in the gas storage cavity (6).

2. According to claim 1, a square aluminum shell solid-state battery with stable heat dissipation is characterized in that: The automatic valve structure comprises an inner wall matching ring (801), an air-sealing plug (802) and a control top shaft (803); the inner wall matching ring (801) is fixedly arranged on the inner wall surface of the interconnected inner cavity (8); the air-sealing plug (802) is arranged below the inner wall matching ring (801); when the air-sealing plug (802) moves upward, it can contact and cooperate with the inner wall matching ring (801) to close the interconnected inner cavity (8); the air-sealing plug (802) and the control top shaft (803) are fixedly installed; one end of the control top shaft (803) away from the air-sealing plug (802) passes through the side wall of the raised portion (7) and extends to the outside of the raised portion (7); the control top shaft (803) is in airtight contact with the raised portion (7).

3. A square aluminum shell solid-state battery with stable heat dissipation according to claim 2, characterized in that: A spring support disk (804) is fixedly provided on the surface of the control top shaft (803), and a vent hole (805) is provided through the surface of the spring support disk (804). A normally closed spring (806) is provided below the spring support disk (804), and the normally closed spring (806) provides an elastic support force so that the air-tight plug (802) has an elastic tendency to move upward. An external synchronous connecting rod (807) is fixedly provided on one end of the control top shaft (803) outside the raised portion (7).

4. A square aluminum shell solid-state battery with stable heat dissipation according to claim 3, characterized in that: An independent closed air cavity (808) is provided in the side wall of the square aluminum shell (2); a cylindrical through groove (809) is provided outside the independent closed air cavity (808); a cylindrical piston (810) is inserted inside the cylindrical through groove (809); and the cylindrical piston (810) is in airtight contact with the cylindrical through groove (809).

5. A square aluminum shell solid-state battery with stable heat dissipation according to claim 4, characterized in that: One end of the external synchronous connecting rod (807) is located below the cylindrical piston (810). When the temperature of the solid-state battery cell (1) abnormally rises to a set threshold, the gas in the independent closed air cavity (808) expands due to the heat, pushing the cylindrical piston (810) downward. The cylindrical piston (810) pushes the external synchronous connecting rod (807) downward, driving the air-tight plug (802) to move downward and open.

6. A square aluminum shell solid-state battery with stable heat dissipation according to claim 1, characterized in that: An electrode contact plate (201) is fixedly arranged on the upper surface of the square aluminum shell (2), the solid-state battery cell (1) supplies power to the outside via the electrode contact plate (201), a split contact plate (202) is arranged above the electrode contact plate (201), and an insulating bracket (203) is fixedly arranged on the upper surface of the square aluminum shell (2), the insulating bracket (203) fixedly supports the split contact plate (202).

7. A square aluminum shell solid-state battery with stable heat dissipation according to claim 6, characterized in that: A bridging spring sheet (204) is provided between the electrode contact plate (201) and the split contact plate (202); the electrode contact plate (201) is electrically connected to the split contact plate (202) via the bridging spring sheet (204); a fixed support sheet (205) is fixedly provided on the bridging spring sheet (204); an insulating shaft moving plate (206) is provided between the electrode contact plate (201) and the split contact plate (202); and the fixed support sheet (205) is inserted and fixed in the insulating shaft moving plate (206).

8. The square aluminum shell solid-state battery with stable heat dissipation according to claim 7, characterized in that: A top boss (207) is fixedly provided on the upper surface of the square aluminum shell (2), a driving cavity (208) is provided in the top boss (207), a driving piston (209) is slidably provided in the driving cavity (208), and the driving piston (209) is in airtight contact with the driving cavity (208).

9. A square aluminum shell solid-state battery with stable heat dissipation according to claim 8, characterized in that: A connecting square rod (210) is fixedly provided on one side of the driving piston (209), the connecting square rod (210) being fixedly connected to the insulating shaft moving plate (206), and a return spring (211) is provided on the side of the driving piston (209) facing the location of the connecting square rod (210), the return spring (211) applying an axial return elastic force to the driving piston (209).

10. A square aluminum shell solid-state battery with stable heat dissipation according to claim 9, characterized in that: An input airflow channel (212) is provided at the end of the driving cavity (208), the other end of the input airflow channel (212) is in communication with the interconnecting inner cavity (8), a return outer tube (213) is provided at the side wall of the driving cavity (208), the other end of the return outer tube (213) is opened between the side-blowing fan (5) and the square aluminum shell (2).

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