A kind of top cover for power battery with aluminum shell

Abstract

The invention belongs to the technical field of power batteries, and in particular relates to a top cover for an aluminum shell power battery, which includes a top cover sheet, and the top cover sheet is provided with two electrode introduction holes, and the two electrode introduction holes are respectively connected with a negative pole pole structure and a Positive pole structure. The positive pole structure includes a positive pole and a high temperature resistance. The positive pole passes through the electrode introduction hole and is insulated and connected to the top cover. The positive pole and the top cover are also electrically connected through a high temperature resistance. The resistance value of the high temperature resistor is 10~1000 ohms. Compared with the prior art, the present invention realizes conduction between the positive pole and the aluminum shell by electrically connecting the high-temperature resistant resistor between the positive pole and the top cover sheet, ensures that the potential of the aluminum shell and the positive pole is consistent, and can effectively prevent aluminum Shell corrosion; on the other hand, it solves the safety hazard of the existing technology under high temperature conditions, making the aluminum shell battery have good safety performance even under abuse conditions such as extrusion, nail penetration, and overcharging.

Description

technical field

[0001] The invention belongs to the technical field of power batteries, and in particular relates to a top cover for an aluminum case power battery. Background technique

[0002] With the development of modern society and the enhancement of people's awareness of environmental protection, more and more devices choose to use lithium batteries as power sources, such as mobile phones, notebook computers, power tools and electric vehicles, etc., which provides a great opportunity for the application and development of lithium batteries wide open space. Among them, lithium batteries used in electric tools and electric vehicles are generally called power batteries.

[0003] Aluminum shells are widely used in power batteries due to their low cost, light weight, and good heat dissipation. However, due to the potential difference between the potential of aluminum and the potential of the positive electrode of the battery, it will cause corrosion of the aluminum shell...

Examples

Embodiment 1

[0027] Example 1, such as figure 1 As shown, a top cover for an aluminum case power battery provided in this embodiment includes a top cover sheet 2 made of aluminum, and the top cover sheet 2 is provided with two electrode introduction holes, and the two electrode introduction holes are respectively connected with Negative pole structure 1 and positive pole structure 3, wherein, such as figure 2 As shown, the positive pole structure 3 includes a positive pole 31 and a high temperature resistant resistor 32. The positive pole 31 passes through the electrode introduction hole and is insulated and connected with the top cover sheet 2. The positive pole 31 and the top cover sheet 2 are also connected through a high temperature resistant The resistor 32 is electrically connected, and the material of the high temperature resistance resistor 32 is silicon carbide, its resistance value is 10 ohms, and its maximum temperature is greater than 600°C. The high temperature resistant res...

Embodiment 2

[0028] Embodiment 2 is different from Embodiment 1 in that the resistance value of the high temperature resistant resistor 32 is 50 ohms, and, as image 3 As shown, a high temperature resistant insulating sealing ring 33 is also provided between the bottom of the positive pole 31 and the lower surface of the top cover sheet 2 .

[0029] Other structures are the same as those in Embodiment 1, and will not be repeated here.

Embodiment 3

[0030] Embodiment 3 is different from Embodiment 1 in that the resistance value of the high temperature resistant resistor 32 is 100 ohms, and, as Figure 4 As shown, a high-temperature resistant insulating sealing ring 33 is also provided between the bottom of the positive pole 31 and the lower surface of the top cover sheet 2, and a retaining spring 34 is provided between the positive pole 31 and the high-temperature resistance 32. The key connection of the spring 34 realizes the firm connection of the two.

[0031] Other structures are the same as those in Embodiment 1, and will not be repeated here.

technical field

[0001] The invention belongs to the technical field of power batteries, and in particular relates to a top cover for an aluminum case power battery. Background technique

[0002] With the development of modern society and the enhancement of people's awareness of environmental protection, more and more devices choose to use lithium batteries as power sources, such as mobile phones, notebook computers, power tools and electric vehicles, etc., which provides a great opportunity for the application and development of lithium batteries wide open space. Among them, lithium batteries used in electric tools and electric vehicles are generally called power batteries.

[0003] Aluminum shells are widely used in power batteries due to their low cost, light weight, and good heat dissipation. However, due to the potential difference between the potential of aluminum and the potential of the positive electrode of the battery, it will cause corrosion of the aluminum shell...

Examples

Embodiment 1

[0027] Example 1, such as figure 1 As shown, a top cover for an aluminum case power battery provided in this embodiment includes a top cover sheet 2 made of aluminum, and the top cover sheet 2 is provided with two electrode introduction holes, and the two electrode introduction holes are respectively connected with Negative pole structure 1 and positive pole structure 3, wherein, such as figure 2 As shown, the positive pole structure 3 includes a positive pole 31 and a high temperature resistant resistor 32. The positive pole 31 passes through the electrode introduction hole and is insulated and connected with the top cover sheet 2. The positive pole 31 and the top cover sheet 2 are also connected through a high temperature resistant The resistor 32 is electrically connected, and the material of the high temperature resistance resistor 32 is silicon carbide, its resistance value is 10 ohms, and its maximum temperature is greater than 600°C. The high temperature resistant res...

Embodiment 2

[0028] Embodiment 2 is different from Embodiment 1 in that the resistance value of the high temperature resistant resistor 32 is 50 ohms, and, as image 3 As shown, a high temperature resistant insulating sealing ring 33 is also provided between the bottom of the positive pole 31 and the lower surface of the top cover sheet 2 .

[0029] Other structures are the same as those in Embodiment 1, and will not be repeated here.

Embodiment 3

[0030] Embodiment 3 is different from Embodiment 1 in that the resistance value of the high temperature resistant resistor 32 is 100 ohms, and, as Figure 4 As shown, a high-temperature resistant insulating sealing ring 33 is also provided between the bottom of the positive pole 31 and the lower surface of the top cover sheet 2, and a retaining spring 34 is provided between the positive pole 31 and the high-temperature resistance 32. The key connection of the spring 34 realizes the firm connection of the two.

[0031] Other structures are the same as those in Embodiment 1, and will not be repeated here.

Images