Rechargeable solid state battery

Abstract

The rechargeable solid-state battery comprises a cap assembly, a winding cell assembly and a metal shell, one side of the metal shell is sealed, the other side of the metal shell is open, a spinning edge is arranged at the open position, a groove is formed in the side face of the metal shell, and the inwards-concave side wall of the groove, the side wall of the metal shell and a connecting wall form a whole. The winding battery cell assembly is arranged between the sealed bottom of the metal shell and the groove, the cap assembly is arranged between the spinning edge and the groove, a corrosion-resistant plastic sealing ring is arranged in the cap assembly and composed of an upper annular side wall, a lower annular side wall and a baffle, a through hole is formed in the baffle, the anti-explosion valve is arranged in the upper annular side wall, and the anti-explosion valve is arranged in the lower annular side wall. The anti-explosion valve is mechanically pressed through the spinning edge and the baffle, the upper annular side wall is tightly matched with the side wall of the metal shell, the lower annular side wall is tightly matched with the inner concave side wall, and the baffle is tightly matched with the connecting wall. The rechargeable solid-state battery disclosed by the utility model has the advantages of low leakage risk, larger cell volume proportion and low assembly cost.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a rechargeable solid-state battery. Background Technology

[0002] AA and AAA batteries are widely used in daily life. Most of the batteries on the market are disposable and cannot be used continuously. Discarded dry batteries cannot be recycled and reused, which can easily cause environmental pollution.

[0003] Chinese patent document CN203787480U discloses a variable voltage cylindrical battery device that converts the high voltage (3.0-4.2V) of a lithium battery to a low voltage of 1.5V via a voltage-dropping circuit board, replacing common batteries. Existing lithium batteries primarily use liquid electrolytes, which are prone to leakage and pose a risk of corrosion to the voltage-dropping circuit board. A common method for voltage reduction is to add a voltage-dropping component to the outside of the lithium battery, then encapsulate the lithium battery and the voltage-dropping component into a casing to assemble a 1.5V battery. While this secondary assembly solves the problems of voltage-dropping board corrosion and voltage reduction, the external voltage-dropping component occupies cell space, reducing the cell's volume ratio, and the additional encapsulation process increases material and cost. Utility Model Content

[0004] The present invention aims to provide a rechargeable battery built into a step-down component.

[0005] The technical solution adopted by the rechargeable battery disclosed in this utility model is as follows:

[0006] A rechargeable solid-state battery includes a cap assembly, a wound cell assembly, and a metal casing. One side of the metal casing is sealed, while the other side is open. A spun edge is provided at the open side. A groove is also provided on the side of the metal casing. The inner concave sidewall of the groove and the sidewall of the metal casing are connected as a whole by a connecting wall. The wound cell assembly is fixedly disposed between the bottom of the sealed metal casing and the groove. The cap assembly is fixedly disposed between the spun edge and the groove. The cap assembly has a built-in corrosion-resistant plastic sealing ring, which consists of an upper annular sidewall and a lower annular sidewall. The device consists of sidewalls and baffles. The outer diameter of the upper annular sidewall is equal to that of the baffle and is located on one side of the baffle. The outer diameter of the lower annular sidewall is smaller than that of the baffle and is located on the other side of the baffle. The baffle has a through hole inside, and the inner diameter of the through hole is smaller than that of the lower annular sidewall. The explosion-proof valve is placed inside the upper annular sidewall. The explosion-proof valve is mechanically pressed against the baffle by a spun edge. The upper annular sidewall is tightly fitted with the sidewall of the metal shell, the lower annular sidewall is tightly fitted with the concave sidewall, and the baffle is tightly fitted with the connecting wall. Multiple seals are achieved through the groove, the metal shell, and the corrosion-resistant plastic sealing ring.

[0007] Furthermore, the electrolyte inside the wound cell assembly is a solid electrolyte, which is one of four types: oxide electrolyte, sulfide electrolyte, polymer electrolyte, and composite electrolyte.

[0008] Furthermore, the explosion-proof valve is circular, with a connecting part on the outside and an oval-shaped body recessed to one side in the middle. The recess in the middle of the body forms a groove, and the groove has engravings.

[0009] Furthermore, the baffle is also provided with a connecting channel, which is located between the lower annular sidewall and the through hole.

[0010] Furthermore, the cap assembly also includes a PTC and a steel cap on the side of the corrosion-resistant plastic sealing ring away from the wound cell assembly.

[0011] Furthermore, the cap assembly also has a CID on the side of the corrosion-resistant plastic sealing ring near the wound cell assembly. When the battery overheats or short-circuits, the CID quickly cuts off the current.

[0012] Furthermore, the wound cell assembly includes a cell, a positive electrode tab, a negative electrode tab, an upper insulating sheet, and a lower insulating sheet. The negative electrode tab is folded from the side of the wound cell assembly to the bottom surface. A lower insulating pad is placed between the bottom surface of the wound cell assembly and the negative electrode tab. The negative electrode tab is electrically connected to the inner side of the metal shell. The positive electrode tab passes through the upper insulating sheet and is electrically connected to the CID, then passes through the explosion-proof valve, and is sequentially electrically connected to the PTC and the high-voltage positive electrode of the step-down plate. The steel cap is connected to the low-voltage positive electrode of the step-down plate, and the spun edge is electrically connected to the negative electrode of the step-down plate after spun.

[0013] Furthermore, the negative electrode tab is welded to the inside of the metal casing.

[0014] Furthermore, the PTC is replaced with a nickel ring.

[0015] Furthermore, the metal casing is also equipped with an indicator light, which is connected to the internal circuit of the battery. The indicator light is lit when charging and turns off when fully charged, or illuminates a different color.

[0016] This utility model is a rechargeable solid-state battery. The electrolyte inside the cell is solid. The groove, metal shell, and corrosion-resistant plastic sealing ring are tightly fitted together to reduce the risk of leakage. The step-down plate is built into the lithium battery cap assembly, which increases the cell volume ratio and saves costs. Attached Figure Description

[0017] Figure 1 This is an exploded view of the rechargeable solid-state battery of this utility model;

[0018] Figure 2 This is a cross-sectional view of the rechargeable solid-state battery of this utility model;

[0019] Figure 3 This is a perspective view of the rechargeable solid-state battery of this utility model;

[0020] Figure 4This is a perspective view of the corrosion-resistant plastic sealing ring for the rechargeable solid-state battery of this utility model.

[0021] Figure 5 This is a cross-sectional view of the corrosion-resistant plastic sealing ring for the rechargeable solid-state battery of this utility model;

[0022] Figure 6 This is a cross-sectional view of the metal casing of the rechargeable solid-state battery of this utility model;

[0023] Figure 7 This is a cross-sectional view of the rechargeable solid-state battery of this utility model after spinning.

[0024] Figure 8 This is a cross-sectional view of the rechargeable solid-state battery of this utility model before spinning.

[0025] Figure 9 This is a perspective view of the rechargeable solid-state battery wound cell assembly of this utility model;

[0026] Figure 10 This is a cross-sectional view of the rechargeable solid-state battery wound cell assembly of this utility model. Detailed Implementation

[0027] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:

[0028] The nominal voltage of existing lithium batteries on the market is usually 3.0-4.2V, which is not suitable for direct use in household electronic products. Furthermore, since mainstream lithium batteries use liquid electrolytes, which are prone to leakage and corrosion, the step-down plate 2, built into the cap assembly 9, is easily corroded by leaking electrolyte, affecting battery performance. This invention replaces the liquid electrolyte with a solid electrolyte. Because solid electrolytes are stable and less prone to leakage and corrosion, the step-down plate can be built into the lithium battery cap assembly. Compared to existing technologies that add a step-down component to the existing lithium battery and then assemble the lithium battery and the step-down component into a casing, this method of building the step-down plate with a solid electrolyte increases the cell volume and battery capacity, and eliminates the need for secondary packaging, saving costs.

[0029] The solid electrolyte is existing technology. Commonly used solid electrolytes include oxide electrolytes (such as LLZO, LATP) and sulfide electrolytes (such as Li3PS4, Li...). 12 GeP2S 12 There are four types: polymer electrolytes (such as PEO-based electrolytes) and composite electrolytes (such as LLZO / PEO).

[0030] like Figure 1 , 2As shown in Figure 9, a rechargeable solid-state battery includes a cap assembly 9, a wound cell assembly 8, and a metal casing 5. The metal casing 5 is cylindrical, sealed on one side and open on the other side, with a spun edge 51 at the open side. The side of the metal casing 5 is also provided with a groove 52. The wound cell assembly 8 is fixedly disposed inside the metal casing 5 by means of the bottom of the seal and the groove 52. The cap assembly 9 is fixedly disposed between the spun edge 51 and the groove 52.

[0031] like Figure 6 As shown, the concave sidewall 522 of the groove 52 and the metal shell sidewall 523 are connected into a whole by the connecting wall 521.

[0032] like Figure 1 , 4 As shown in Figure 5, the cap assembly 9, from the side closest to the wound cell assembly 8 upwards, is provided with CID 7, corrosion-resistant plastic sealing ring 6, explosion-proof valve 4, PTC 3, step-down plate 2, and steel cap 1. The corrosion-resistant plastic sealing ring 6 is located in the middle, with CID 7 located on the side closest to the wound cell assembly 8. On the other side, from the side closest to CID 7 to the side furthest from CID 7, explosion-proof valve 4 and PTC 3 are assembled in sequence. 3. Pressure reducing plate 2 and corrosion-resistant plastic sealing ring 6 are composed of upper annular sidewall 61, lower annular sidewall 62 and baffle 63. The outer diameter of the upper annular sidewall 61 is equal to the outer diameter of the baffle 63. The upper annular sidewall 61 is located on one side of the baffle 63. The outer diameter of the lower annular sidewall 62 is smaller than the outer diameter of the baffle 63. The lower annular sidewall 62 is located on the other side of the baffle 63. A through hole 64 is opened inside the baffle 63. The inner diameter of the through hole is smaller than the inner diameter of the lower annular sidewall 62. A connecting channel is also provided on the baffle 63. The connecting channel is located between the lower annular sidewall 62 and the through hole 64.

[0033] The explosion-proof valve 4 is circular, with its outer diameter equal to the inner diameter of the upper annular sidewall 61. A connecting part 42 is provided on the outer side of the explosion-proof valve 4. The valve 4 has a recessed, oval-shaped body 41 in the middle, forming a groove. The groove has markings, specifically annular markings. The mechanical strength at the annular markings is significantly lower than the surrounding area. When the internal pressure of the battery exceeds a set threshold, the groove markings crack preferentially, ensuring that the pressure is released along a preset path. During assembly, the explosion-proof valve 4 is placed inside the upper annular sidewall 61. The connecting part 42 abuts against the baffle 63, covering the connecting channel on the baffle 63. The body 41 is embedded in the through hole 64. The connecting part 42 is mechanically pressed against the baffle 63 by a spun edge 51, ensuring an airtight connection. The upper annular sidewall 61 is tightly fitted with the metal outer shell sidewall 523, the lower annular sidewall 62 is tightly fitted with the concave sidewall 522, and the baffle 63 is tightly fitted with the connecting wall 521. By setting the groove 52, the metal outer shell 5 and the corrosion-resistant plastic sealing ring 6 achieve multiple seals to increase the sealing performance, thereby completely isolating the step-down plate 2 from the wound cell assembly 8.

[0034] The CID is a current cut-off device. Its function in lithium batteries is to ensure that the battery can quickly cut off the current under abnormal conditions, preventing safety accidents such as battery overheating, short circuits, and explosions.

[0035] The PTC is a thermistor. The resistance of the PTC increases with the temperature. When the battery experiences overcurrent or overheating, the resistance of the PTC will increase sharply, thereby limiting the current and preventing the battery from causing safety problems due to overcurrent or overheating.

[0036] The step-down board is a device for reducing the battery output voltage to adapt to the working requirements of different devices and ensure that the battery operates within a safe range.

[0037] The main function of the explosion-proof valve is to open in time to release the internal pressure when the internal pressure of the battery rises abnormally, so as to prevent the battery from exploding due to excessive internal pressure.

[0038] The corrosion-resistant plastic sealing ring ensures the battery has good sealing performance, prevents electrolyte leakage and corrosion, and provides a good sealed environment for the internal reaction of the battery.

[0039] like Figure 5 , 6 As shown, when the cap assembly 9 is assembled, the opening of the metal shell 5 is upright and not bent, which facilitates the assembly of each component. After assembly, the cap assembly 9 is fixed between the spun edge 51 and the groove 52 by spinning to form a spun edge 51.

[0040] like Figure 6 , 7 As shown, the wound cell assembly 8 includes a cell, a positive electrode tab 81, a negative electrode tab 82, an upper insulating sheet, and a lower insulating sheet.

[0041] During assembly, the wound cell assembly 8 is placed inside the metal casing 5. The negative electrode tab 82 is folded from the side of the wound cell assembly 8 to the bottom. A lower insulating pad is placed between the bottom of the wound cell assembly 8 and the negative electrode tab 82. The negative electrode tab 82 is electrically connected to the inside of the metal casing 5. Preferably, the negative electrode tab 82 is welded to the inside of the metal casing 5. The positive electrode tab 81 passes through the upper insulating sheet and is electrically connected to CID 7, then passes through the explosion-proof valve 4, and is electrically connected to the PTC 3 and the high-voltage positive electrode of the step-down plate 2 in sequence. The steel cap 1 is connected to the low-voltage positive electrode of the step-down plate 2. The spun edge 51 is spun and then electrically connected to the negative electrode of the step-down plate 2.

[0042] Preferably, the metal casing 5 is also provided with an indicator light, which is connected to the internal circuit of the battery. When charging, the indicator light is on to indicate that charging is in progress, and when fully charged, the indicator light is on a different color or turns off to indicate that it is fully charged.

[0043] In use, the steel cap 1 is connected to the positive terminal of the electronic device, and the metal casing 5 is connected to the negative terminal of the electronic device. The wound cell assembly 8 outputs a stable low voltage to the electronic device after being stepped down by the step-down plate 2 inside the cap assembly 9. During use, since PTC 3 and CID 7 are both connected to the circuit, when the battery overheats, the resistance of PTC 3 will increase sharply, thereby limiting the current and protecting the cell. When the battery short-circuits, CID 2 will quickly cut off the current to protect the cell. When the internal pressure of the battery rises abnormally, the explosion-proof valve will open in time to release the internal pressure and prevent the battery from exploding due to excessive internal pressure.

[0044] During charging, the steel cap 1 is connected to the positive terminal of the external power supply, and the metal casing 5 is connected to the negative terminal of the external power supply to charge the battery. Since PTC 3 and CID 7 are both connected to the circuit and an explosion-proof valve is also provided, the battery cell will be protected by limiting the current, cutting off the circuit, and releasing the pressure when abnormal temperature, pressure, or current occurs during charging.

[0045] In another embodiment, the PTC is replaced with a nickel ring. Since the CID 7 already has the protection against overheating and current cutoff, replacing the PTC with a nickel ring can prevent the battery from deforming or breaking when subjected to external impact or pressure.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rechargeable solid-state battery, comprising a cap assembly, a wound cell assembly, and a metal casing, wherein one side of the metal casing is sealed and the other side is open, the open side has a spun edge, and the side of the metal casing also has a groove, the inner concave sidewall of the groove and the sidewall of the metal casing being connected as a whole by a connecting wall, the wound cell assembly being fixedly disposed between the bottom of the sealed metal casing and the groove, and the cap assembly being fixedly disposed between the spun edge and the groove, characterized in that, The cap assembly has a built-in corrosion-resistant plastic sealing ring, which consists of an upper annular sidewall, a lower annular sidewall, and a baffle. The outer diameter of the upper annular sidewall is equal to the outer diameter of the baffle and is located on one side of the baffle. The outer diameter of the lower annular sidewall is smaller than the outer diameter of the baffle and is located on the other side of the baffle. The baffle has a through hole inside, and the inner diameter of the through hole is smaller than the inner diameter of the lower annular sidewall. The explosion-proof valve is placed inside the upper annular sidewall. The explosion-proof valve is mechanically pressed against the baffle by a spun edge. The upper annular sidewall is tightly fitted with the sidewall of the metal shell, the lower annular sidewall is tightly fitted with the concave sidewall, and the baffle is tightly fitted with the connecting wall. Multiple seals are achieved through the groove, the metal shell, and the corrosion-resistant plastic sealing ring.

2. The rechargeable solid-state battery according to claim 1, characterized in that, The electrolyte inside the wound cell assembly is a solid electrolyte, which is one of four types: oxide electrolyte, sulfide electrolyte, polymer electrolyte, and composite electrolyte.

3. The rechargeable solid-state battery according to claim 1, characterized in that, The explosion-proof valve is circular, with a connecting part on the outside and an oval-shaped body that is recessed to one side in the middle. The recessed middle part of the body forms a groove, and the groove has engravings.

4. The rechargeable solid-state battery according to claim 1, characterized in that, The baffle is also provided with a connecting channel, which is located between the lower annular sidewall and the through hole.

5. The rechargeable solid-state battery according to claim 1, characterized in that, The cap assembly also includes a PTC and a steel cap on the side of the corrosion-resistant plastic sealing ring away from the wound cell assembly.

6. The rechargeable solid-state battery according to claim 5, characterized in that, The cap assembly also has a CID on the side of the corrosion-resistant plastic sealing ring near the wound cell assembly. When the battery overheats or short-circuits, the CID quickly cuts off the current.

7. The rechargeable solid-state battery according to claim 6, characterized in that, The wound battery cell assembly includes a battery cell, a positive electrode tab, a negative electrode tab, an upper insulating sheet, and a lower insulating sheet. The negative electrode tab is folded from the side of the wound battery cell assembly to the bottom surface. A lower insulating pad is placed between the bottom surface of the wound battery cell assembly and the negative electrode tab. The negative electrode tab is electrically connected to the inside of the metal shell. The positive electrode tab passes through the upper insulating sheet and is electrically connected to the CID, then passes through the explosion-proof valve, and is sequentially electrically connected to the PTC and the high-voltage positive electrode of the step-down plate. The steel cap is connected to the low-voltage positive electrode of the step-down plate, and the spun edge is electrically connected to the negative electrode of the step-down plate after being spun.

8. The rechargeable solid-state battery according to claim 7, characterized in that, The negative electrode tab is welded to the inside of the metal casing.

9. The rechargeable solid-state battery according to claim 5 or 6, characterized in that, Replace the PTC with a nickel ring.

10. The rechargeable solid-state battery according to any one of claims 1-7, characterized in that, The metal casing is also equipped with an indicator light, which is connected to the internal circuit of the battery. The indicator light is on when charging and turns off when fully charged, or turns on a different color.

Images