CN213425141U

CN213425141U - Lithium battery with battery core capable of preventing overcharge

Info

Publication number: CN213425141U
Application number: CN202022079119.6U
Authority: CN
Inventors: 田建华
Original assignee: Guangdong Yongbang New Energy Co
Current assignee: Guangdong Yongbang New Energy Co
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2021-06-11
Anticipated expiration: 2030-09-21

Abstract

The utility model relates to a lithium battery technology field especially relates to a lithium cell that overcharge was prevented to electricity core, including casing, base plate, deformation board, promotion post, pressure release hole, closing plate and thrust spring, base plate fixed connection is in the inside one side of casing, deformation board fixed connection is in one side of base plate, it is close to the middle part of base plate one side at deformation board to promote post fixed connection, the pressure release hole that runs through is seted up at the middle part of base plate, the one end that promotes the post passes the pressure release hole and extends to the outside of base plate, closing plate fixed connection is in the one end that promotes the post, the closing plate contacts with the outside of base plate. The utility model discloses internal pressure can increase when the lithium cell is overcharged, makes the deformation board take place deformation, promotes the closing plate through promoting the post for the pressure release hole is kept away from to the closing plate, and the inside and outside air of lithium cell can communicate each other, with the inside pressure release of lithium cell, thereby avoids the lithium cell to damage the people when the inflation explosion, improves the security.

Description

Lithium battery with battery core capable of preventing overcharge

Technical Field

The utility model relates to a lithium cell technical field especially relates to a lithium cell that overcharge was prevented to electricity core.

Background

Lithium batteries, which are batteries using lithium metal or lithium alloy as positive/negative electrode materials and using non-aqueous electrolyte solution, have very high environmental requirements for processing, storage and use of lithium metal due to the very active chemical properties of lithium metal, and have become the mainstream along with the development of scientific technology.

Lithium ion battery is as power battery in fields such as electric automobile, electric bicycle, hybrid electric vehicle, and its safety problem receives more and more attention, and the lithium cell is easy to be on fire or explode under extreme condition such as short circuit, overcharge, be heated, be hit, especially carries out overcharge and have very big potential safety hazard under external protection circuit inefficacy, for this reason, provides a lithium cell that electric core prevented overcharging.

Disclosure of Invention

The utility model provides a lithium cell that overcharge was prevented to electricity core possesses the advantage of overcharge protection, has solved the problem that there is very big potential safety hazard in the lithium cell overcharge under external protection circuit inefficacy.

For realizing the technical problem, the utility model provides such lithium cell that overcharge is prevented to electricity core, including casing, base plate, deformation board, promotion post, pressure release hole, closing plate and thrust spring, base plate fixed connection is in the inside one side of casing, deformation board fixed connection is in one side of base plate, promote the middle part that post fixed connection is close to base plate one side at deformation board, the pressure release hole that runs through is seted up at the middle part of base plate, the one end that promotes the post passes the pressure release hole and extends to the outside of base plate, closing plate fixed connection is in the one end that promotes the post, the outside contact of closing plate and base plate, the thrust spring activity is cup jointed at the surface that promotes the post.

Furthermore, one end of the thrust spring is in contact with the inner side of the base plate, and the other end of the thrust spring is in contact with the middle of one side, close to the base plate, of the deformation plate.

Further, the sealing plate corresponds to the pressure relief hole, and the diameter of the sealing plate is larger than the inner diameter of the pressure relief hole.

Furthermore, the right side of the shell is provided with an opening, the right side of the shell is fixedly connected with a cover plate, the inner side of the cover plate is fixedly connected with a stopping frame, and the stopping frame is movably inserted in the shell.

Furthermore, the one end in the apron outside is pegged graft and is had negative pole post, the surface of negative pole post has cup jointed insulating pad, and insulating pad and the outside contact of apron, the inboard one end of locking frame is pegged graft and is had the negative pole connection piece, negative pole connection piece and negative pole post fixed connection, the negative pole connection piece is equipped with piezo-resistor with the junction of negative pole post, piezo-resistor is located the inboard of locking frame.

Furthermore, the other end of the outer side of the cover plate is inserted with an anode pole, the other end of the inner side of the stopping frame is inserted with an anode connecting sheet, and the anode pole is fixedly connected with the anode connecting sheet.

Furthermore, a through groove is formed in the middle of the front face of the cover plate, grid plates are fixedly connected to the middle of the stopping frame at equal intervals, and the through groove corresponds to the grid plates.

Borrow by above-mentioned technical scheme, the utility model provides a lithium cell that overcharge was prevented to electricity core possesses following beneficial effect at least:

1. this lithium cell that overcharge was prevented to electricity core uses through the cooperation of deformation board, promotion post, pressure release hole, closing plate and thrust spring, and internal pressure can increase when the lithium cell overcharges, makes the deformation board take place deformation, promotes the closing plate through promoting the post for the pressure release hole is kept away from to the closing plate, and the inside and outside air of lithium cell can communicate each other, with the inside pressure release of lithium cell, thereby avoids the lithium cell to damage the people when the inflation explosion, improves the security.

2. This lithium cell that overcharge was prevented to electricity core, through thrust spring's setting, when the pressure stability of lithium cell inside, thrust spring promotes deformation board for deformation board recovery normal position, the closing plate pastes closely in the outside of pressure release hole, seals the pressure release hole, prevents that external moisture or dust from getting into the inside to the lithium cell, has improved the life of lithium cell.

3. This lithium cell that overcharge was prevented to electric core, through piezo-resistor's setting, piezo-resistor is used for carrying out the voltage clamp when the circuit bears excessive pressure, absorbs unnecessary electric current in order to protect sensitive device, appears between the two poles of the earth of piezo-resistor when the overvoltage, and piezo-resistor can be with voltage clamp to a relatively fixed voltage value, realizes the protection to back level circuit, when overcharging for charging current no longer flows into inside the electric core, has played the effect of preventing overcharging.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a sectional view of the structure of the present invention;

fig. 3 is a partially enlarged view of a portion a of fig. 2 according to the present invention.

In the figure: 1. a housing; 2. a cover plate; 3. a stopper frame; 4. a negative electrode post; 5. an insulating pad; 6. a voltage dependent resistor; 7. a negative electrode connecting sheet; 8. a positive pole column; 9. a positive electrode connecting sheet; 10. a through groove; 11. a grid plate; 12. a substrate; 13. a deformation plate; 14. pushing the column; 15. a pressure relief vent; 16. a sealing plate; 17. a thrust spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

The invention will be further described with reference to figures 1-3 and the examples below:

the first embodiment is as follows:

a lithium battery with an overcharge-proof battery core comprises a shell 1, a base plate 12, a deformation plate 13, a pushing post 14, a pressure relief hole 15, a sealing plate 16 and a thrust spring 17, wherein the base plate 12 is fixedly connected to one side inside the shell 1, the deformation plate 13 is fixedly connected to one side of the base plate 12, the pushing post 14 is fixedly connected to the middle of one side, close to the base plate 12, of the deformation plate 13, the middle of the base plate 12 is provided with the pressure relief hole 15 which penetrates through, one end of the pushing post 14 penetrates through the pressure relief hole 15 and extends to the outer side of the base plate 12, the sealing plate 16 is fixedly connected to one end of the pushing post 14, the sealing plate 16 is contacted with the outer side, and the diameter of the sealing plate 16 is larger than the inner diameter of the pressure relief hole 15, the thrust spring 17 is movably sleeved on the outer surface of the pushing column 14, one end of the thrust spring 17 is in contact with the inner side of the substrate 12, and the other end of the thrust spring 17 is in contact with the middle of one side of the deformation plate 13 close to the substrate 12.

Internal pressure can increase when the lithium cell overcharges, makes deformation board 13 take place deformation, promotes closing plate 16 through promoting post 14 for pressure release hole 15 is kept away from to closing plate 16, and the inside and outside air of lithium cell can communicate each other, with the inside pressure release of lithium cell, thereby avoids the lithium cell to damage the people when the inflation explosion, improves the security.

When the inside pressure stability of lithium cell, thrust spring 17 promotes deformation board 13 for deformation board 13 resumes the normal position, and closing plate 16 pastes tightly in the outside of pressure release hole 15, seals pressure release hole 15, prevents that external moisture or dust from entering into the inside of lithium cell, has improved the life of lithium cell.

Example two:

the right side of the shell 1 is arranged in an opening, the right side of the shell 1 is fixedly connected with a cover plate 2, the inner side of the cover plate 2 is fixedly connected with a stopping frame 3, the stopping frame 3 is movably inserted in the shell 1, one end of the outer side of the cover plate 2 is inserted with a cathode post 4, the outer surface of the cathode post 4 is sleeved with an insulating pad 5, the insulating pad 5 is contacted with the outer side of the cover plate 2, one end of the inner side of the stopping frame 3 is inserted with a cathode connecting sheet 7, the cathode connecting sheet 7 is fixedly connected with the cathode post 4, a pressure sensitive resistor 6 is arranged at the joint of the cathode connecting sheet 7 and the cathode post 4, the pressure sensitive resistor 6 is positioned at the inner side of the stopping frame 3, the other end of the outer side of the cover plate 2 is inserted with an anode post 8, the other end of the inner side of the stopping frame 3 is inserted with an anode connecting sheet 9, the anode post 8 is fixedly, the through slots 10 correspond to the grid plates 11.

The voltage dependent resistor 6 is used for clamping voltage when the circuit bears overvoltage, absorbing redundant current to protect sensitive devices, and when the overvoltage appears between two poles of the voltage dependent resistor 6, the voltage dependent resistor 6 can clamp the voltage to a relatively fixed voltage value, so that the protection of a rear-stage circuit is realized, and when overcharging, the charging current does not flow into the battery core any more, and the overcharge prevention effect is achieved.

Example three:

When charging, the voltage dependent resistor 6 is used for voltage clamping when the circuit bears overvoltage, and absorbs redundant current to protect sensitive devices, when overvoltage appears between two poles of the voltage dependent resistor 6, the voltage dependent resistor 6 can clamp the voltage to a relatively fixed voltage value, so as to protect a rear-stage circuit, when overcharge occurs, the charging current does not flow into the interior of the battery cell, so that the overcharge prevention effect is achieved, when the lithium battery is overcharged, the internal pressure can be increased, so that the deformation plate 13 is deformed, the sealing plate 16 is pushed by the pushing column 14, so that the sealing plate 16 is far away from the pressure relief hole 15, the air inside and outside the lithium battery can be communicated with each other, the pressure inside the lithium battery is released, when the pressure inside the lithium battery is stable, the pushing spring 17 pushes the deformation plate 13, so that the deformation plate 13 is restored to the original position, the sealing plate 16 is tightly attached to the outer side of the pressure relief hole, seal pressure release hole 15, prevent that external moisture or dust from entering into the inside of lithium cell, improved the life of lithium cell.

It is right above the utility model provides a lithium cell that overcharge was prevented to electric core has carried out detailed introduction. The utility model discloses it is right to have used specific individual example the utility model discloses a principle and implementation have been elucidated, and the explanation of above embodiment is only used for helping understanding the utility model discloses a method and core thought thereof. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. The utility model provides a lithium cell that overcharge is prevented to electricity core, includes casing (1), base plate (12), deformation board (13), promotes post (14), pressure release hole (15), closing plate (16) and thrust spring (17), its characterized in that: base plate (12) fixed connection is in the inside one side of casing (1), deformation board (13) fixed connection is in one side of base plate (12), promote post (14) fixed connection and be close to the middle part of base plate (12) one side at deformation board (13), the pressure release hole (15) that run through are seted up at the middle part of base plate (12), the one end that promotes post (14) is passed pressure release hole (15) and is extended to the outside of base plate (12), closing plate (16) fixed connection is in the one end that promotes post (14), closing plate (16) and the outside contact of base plate (12), thrust spring (17) activity cup joints the surface that promotes post (14).

2. The lithium battery with the battery cell prevented from being overcharged according to claim 1, characterized in that: one end of the thrust spring (17) is in contact with the inner side of the base plate (12), and the other end of the thrust spring (17) is in contact with the middle of one side, close to the base plate (12), of the deformation plate (13).

3. The lithium battery with the battery cell prevented from being overcharged according to claim 1, characterized in that: the sealing plate (16) corresponds to the pressure relief hole (15), and the diameter of the sealing plate (16) is larger than the inner diameter of the pressure relief hole (15).

4. The lithium battery with the battery cell prevented from being overcharged according to claim 1, characterized in that: the right side of casing (1) is the opening setting, the right side fixedly connected with apron (2) of casing (1), the inboard fixedly connected with of apron (2) stops frame (3), stop frame (3) activity is pegged graft in the inside of casing (1).

5. The lithium battery with the battery cell prevented from being overcharged according to claim 4, characterized in that: one end in apron (2) outside is pegged graft and is had negative pole post (4), the surface of negative pole post (4) has cup jointed insulating pad (5), and the outside contact of insulating pad (5) and apron (2), the inboard one end of stop frame (3) is pegged graft and is had negative pole connection piece (7), negative pole connection piece (7) and negative pole post (4) fixed connection, the junction of negative pole connection piece (7) and negative pole post (4) is equipped with piezo-resistor (6), piezo-resistor (6) are located the inboard of stop frame (3).

6. The lithium battery with the battery cell prevented from being overcharged according to claim 4, characterized in that: the other end of the outer side of the cover plate (2) is inserted with an anode pole column (8), the other end of the inner side of the stopping frame (3) is inserted with an anode connecting sheet (9), and the anode pole column (8) is fixedly connected with the anode connecting sheet (9).

7. The lithium battery with the battery cell prevented from being overcharged according to claim 4, characterized in that: the middle of the front face of the cover plate (2) is provided with a through groove (10), the middle of the stopping frame (3) is fixedly connected with a grid plate (11) at equal intervals, and the through groove (10) corresponds to the grid plate (11).