CN216133921U

CN216133921U - Battery sealing structure

Info

Publication number: CN216133921U
Application number: CN202121656540.7U
Authority: CN
Inventors: 刘礼刚
Original assignee: Guangzhou Kentli Electronics Technology Co ltd
Current assignee: Guangzhou Kentli Electronics Technology Co ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2022-03-25
Anticipated expiration: 2031-07-21

Abstract

A battery sealing structure is characterized in that a metal ring wraps the outer edge of a circuit board, a separation ring extends from the inner end of the metal ring to the circuit board, an injected rubber block wraps the separation ring, and the outer side of the rubber block is abutted against the inner wall of a steel shell; the explosion-proof metal tube of the explosion-proof valve passes through the circuit board, and the inner side of the electrode terminal is provided with a rubber plug for plugging the orifice of the explosion-proof metal tube. The battery sealing structure can greatly improve the sealing performance and safety of the battery and effectively reduce the difficulty of installation and manufacture; and the safety of the battery can be effectively improved by the arrangement of the explosion-proof valve, and the structural complexity, the manufacturing difficulty and the production cost of the battery are reduced.

Description

Battery sealing structure

Technical Field

The present invention relates to a battery structure, and more particularly, to a sealing structure of a lithium battery.

Background

In the development of modernization, batteries are more and more widely applied to various electric appliances, and the performance requirements of people on the batteries are higher and higher. In order to improve the performance and safety of the battery, the utility model patent application with chinese patent publication No. CN112201839A discloses a lithium battery structure, as shown in fig. 1, a cap assembly 101 of the battery is provided with a circuit board 102, a metal ring 103, and an explosion-proof valve 104, and plastic is filled between the inner side of the metal ring and the explosion-proof valve to form a rubber block 105, through which circuit components are wrapped. The lithium battery structure can utilize the through hole to vacuumize and inject electrolyte into the winding core in the steel shell, so that the battery space is more fully utilized and the battery capacity is improved. On the other hand, the steel shell 106 and the metal ring are fixed by welding, which has high process requirements, and if the steel shell is not welded, electrolyte inside the battery may leak, thereby affecting the safety of the battery.

Disclosure of Invention

The utility model aims to provide a battery sealing structure with better sealing performance so as to improve the safety of a battery and reduce the manufacturing difficulty.

The battery sealing structure comprises an annular hollow metal ring, wherein a circuit board with a power management function is arranged in the metal ring, the outer side of the circuit board is connected with an electrode terminal for conducting electricity, and the inner side of the circuit board is provided with an explosion-proof valve; the outer side end of the metal ring wraps the outer side edge of the circuit board and is electrically communicated with a circuit of the circuit board, the tail end of the metal ring, which is positioned on the inner side of the circuit board, extends outwards back to the circuit board to form a separating ring, the inner side of the circuit board is filled with a rubber block, the separating ring is wrapped in the separating ring by the rubber block, and the outer side of the rubber block is abutted against the inner wall of the steel shell.

According to the battery sealing structure, the metal ring is coated on the edge of the circuit board, so that the metal ring can be electrically connected with a circuit of the circuit board on one hand, can be used as an electric connecting piece between the circuit board and the steel shell and can also be used as a heat radiating piece at the same time, and heat generated by parts such as the circuit board, an electronic element and the like can be quickly guided to the steel shell, so that the heat radiating efficiency is improved; the inner side of the metal ring extends to form a separating ring, the separating ring divides the rubber block into two parts, one part of the separating ring is clamped between the separating ring and the steel shell, when poured liquid gel is bonded into the rubber block, the volume of the liquid gel on the inner side of the separating ring is large, and shrinkage to a certain degree can occur to affect the sealing performance, but the volume of the liquid gel between the separating ring and the steel shell is small, and even if shrinkage occurs, the influence degree is very small, and adverse effects cannot be caused on the sealing performance of the lithium battery. Through the battery sealing structure, the sealing performance and the safety of the battery can be greatly improved, and the difficulty of installation and manufacture is effectively reduced.

Drawings

Fig. 1 is a schematic structural diagram of a conventional lithium battery structure.

Fig. 2 and 3 are schematic structural views of the battery sealing structure of the utility model.

Fig. 4 is a schematic view of the internal structure of the battery sealing structure.

Fig. 5 is a schematic structural view of a second embodiment of a battery sealing structure.

Detailed Description

Embodiment one, as shown in fig. 2-4. The battery sealing structure 10 is arranged at the positive end of the battery 20; the anti-explosion circuit board comprises an annular and hollow metal ring 1, wherein a circuit board 2 with a power management function is arranged in the metal ring, the outer side of the circuit board is connected with an electrode terminal 3 for conducting electricity, and an anti-explosion valve is arranged at the inner side of the circuit board; the electrode terminal 3 is a positive electrode cap; the outer side end of the metal ring is wrapped on the outer side edge of the circuit board and is electrically communicated with a circuit of the circuit board, the tail end of the metal ring, which is positioned on the inner side of the circuit board, extends outwards back to the circuit board to form a separating ring 11, the inner side of the circuit board is filled with a rubber block 5, the separating ring is wrapped in the rubber block, and the outer side of the rubber block is abutted against the inner wall of the steel shell 6; the edge of the tail end of the steel shell 6 is bent inwards to form a flange 61 and is abutted against the outer side of the metal ring, and an inwards-convex steel shell boss 62 is arranged between the extending end of the metal ring and the winding core 7 of the steel shell; and the steel shell boss 62 is formed by inward bending transition of the steel shell 6.

In the battery sealing structure, the metal ring is covered on the edge of the circuit board, so that the metal ring can be electrically connected with a circuit of the circuit board on one hand, can be used as an electric connecting piece between the circuit board and the steel shell and can also be used as a heat radiating piece at the same time, and heat generated by parts such as the circuit board, an electronic element and the like can be quickly guided to the steel shell, thereby improving the heat radiating efficiency; the inner side of the metal ring extends to form a separating ring, the separating ring divides the rubber block into two parts, one part of the separating ring is clamped between the separating ring and the steel shell, when poured liquid is gelled into the rubber block, the liquid rubber on the inner side of the separating ring has larger volume and can possibly shrink to a certain degree to influence the sealing performance, but the liquid rubber between the separating ring and the steel shell has smaller volume, and even if the liquid rubber shrinks, the influence degree is very small, and the sealing performance of the lithium battery cannot be adversely affected, so that the sealing performance and the safety of the lithium battery are greatly improved, and the difficulty in installation and manufacture is effectively reduced. Be provided with the steel casing boss of slot-like on the steel casing, can put into the steel casing with the battery cap structure that metal ring, circuit board, electrode terminals, explosion-proof valve, rubber block etc. are connected and are formed wholly, then carry out the turn-ups with the end of steel casing and buckle, thereby press from both sides whole battery cap structure and press from both sides tightly fixedly, it both can avoid traditional welding operation and the leakage and the security problem that bring, can improve the manufacturing convenience again, the slot rolling processing is also very easy, this can effectively reduce the production degree of difficulty and improve production efficiency.

The battery sealing structure is characterized in that the circuit board 1 is provided with glue passing holes for communicating the inner side and the outer side, so that glue can flow into the inner side from the outer side of the circuit board during glue injection and finally form a glue block in a required shape, the production quality is guaranteed, the process is simplified, and meanwhile, the processing cost is reduced and the production efficiency is improved.

The battery sealing structure, explosion-proof valve include explosion-proof metal tube 41 and rubber buffer 42, explosion-proof metal tube locates circuit board 1's inboard and wherein one end passes circuit board and directional electrode terminal's inboard, the rubber buffer sets up between electrode terminal inboard and explosion-proof metal tube end and the mouth of pipe of shutoff explosion-proof metal tube.

The explosion-proof bead with the existing lithium battery structure is easy to break through the positive electrode cap and spray out of the battery when the battery is abnormal and is sprayed out, so that the safety of electric appliances and users is damaged; meanwhile, the manufacturing and the installation of the explosion-proof bead are complex, the precision requirement is high, the sealing performance between the explosion-proof bead and the explosion-proof metal tube is low, and the risk that the explosion-proof bead falls off accidentally when the battery bears the impact is avoided. Therefore, the battery sealing structure takes the explosion-proof metal tube as a sealing piece of the tube opening of the explosion-proof metal tube by penetrating the explosion-proof metal tube through the circuit board and the flexible and deformable rubber plug, and the rubber plug can continuously seal the tube opening of the explosion-proof metal tube under the normal use condition of the battery; if the lithium cell is inside takes place unusually or produces the high fever and when causing electrolyte gasification, the lithium cell is inside will to be filled a large amount of gas and lead to atmospheric pressure to increase, increase atmospheric pressure will form the driving force to the rubber buffer, after this driving force reaches the setting value, will make the rubber buffer take place deformation and with explosion-proof metal pipe mouth of pipe between produce the clearance, gaseous clearance department discharge from the two to form the pressure release, make the inside atmospheric pressure of battery descend, prevent from this that the lithium cell from exploding because of inside atmospheric pressure is too big. Through the arrangement of the structure, the excessive air pressure in the battery can be effectively and quickly released, so that the safety of the battery is effectively improved; simultaneously, the manufacturing and the installation of rubber buffer are very easy, and the leakproofness is strong, job stabilization, not only can improve the battery security, can also effectively reduce the structural complexity and the manufacturing difficulty, the manufacturing cost of battery.

Example two, as shown in fig. 5.

A battery sealing structure is arranged at the negative end of a battery and used as the negative electrode of the battery, and an electrode terminal 3 is a negative electrode connecting sheet at the bottom of the battery; the negative connecting sheet is arranged on the outer side of the circuit board 2 and is electrically communicated with the negative end of the circuit board, the inner side of the negative connecting sheet is provided with a concave table, and the rubber plug 42 is arranged in the concave table and is in sealing abutment with the orifice of the explosion-proof metal tube 41; the rest is the same as the first embodiment.

The battery sealing structure can be arranged on the positive electrode of the battery and also can be arranged on the negative electrode of the battery to serve as the connecting end of the negative electrode of the battery, so that the problem of high resistance caused by a positive circuit can be solved, the manufacturing convenience of the battery is improved, and the manufacturing cost and the electric energy consumption are reduced.

Example three.

A battery sealing structure, the explosion-proof valve includes the explosion-proof metal tube 41 and explosion-proof pearl; the rest is the same as the first embodiment.

Claims

1. The utility model provides a battery sealing structure, includes annular and hollow becket (1), is equipped with circuit board (2) that possess the power management function in the becket, and the outside of circuit board is connected with electrode terminal (3) that are used for electrically conducting, and inboard department is provided with explosion-proof valve, its characterized in that: the outer side end of the metal ring is wrapped on the outer side edge of the circuit board and is electrically communicated with a circuit of the circuit board, the tail end of the metal ring, which is positioned on the inner side of the circuit board, extends outwards back to the circuit board to form a separating ring (11), the inner side of the circuit board is filled with a rubber block (5), the separating ring is wrapped in the rubber block, and the outer side of the rubber block is abutted against the inner wall of the steel shell (6).

2. The battery sealing structure according to claim 1, characterized in that: the electrode terminal (3) is a positive electrode cap and is arranged at the positive electrode end of the battery.

3. The battery sealing structure according to claim 1, characterized in that: the negative electrode terminal (3) is a negative electrode connecting sheet which is arranged at the outer side of the circuit board (2) and is electrically communicated with the negative electrode end of the circuit board circuit.

4. A battery sealing structure according to claim 1, 2 or 3, characterized in that: the edge of the tail end of the steel shell (6) is inwards bent to be a flanging (61) and is abutted against the outer side of the metal ring, and an inwards convex steel shell boss (62) is arranged at the position, between the extending end of the metal ring and the winding core (7), of the steel shell.

5. The battery sealing structure according to claim 4, characterized in that: the steel shell boss (62) is formed by inward bending transition of the steel shell (6).

6. A battery sealing structure according to claim 1, 2 or 3, characterized in that: the circuit board (2) is provided with a glue passing hole which is communicated with the inner side and the outer side.

7. A battery sealing structure according to claim 1, 2 or 3, characterized in that: the explosion-proof valve comprises an explosion-proof metal tube (41) and a rubber plug (42), wherein the explosion-proof metal tube is arranged on the inner side of the circuit board (1), one end of the explosion-proof metal tube penetrates through the circuit board and points to the inner side of the electrode terminal, and the rubber plug is arranged between the inner side of the electrode terminal and the end part of the explosion-proof metal tube and seals the tube opening of the explosion-proof metal tube.

8. The battery sealing structure according to claim 7, characterized in that: the inner side of the negative electrode connecting sheet is provided with a concave table, and the rubber plug (42) is arranged in the concave table and is sealed and abutted against the opening of the explosion-proof metal tube (41).

9. A battery sealing structure according to claim 1, 2 or 3, characterized in that: the explosion-proof valve comprises an explosion-proof metal tube (41) and explosion-proof beads.