CN114725609A - Novel button type lithium battery with safe, reliable and explosion-proof functions - Google Patents
Novel button type lithium battery with safe, reliable and explosion-proof functions Download PDFInfo
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- CN114725609A CN114725609A CN202210368626.2A CN202210368626A CN114725609A CN 114725609 A CN114725609 A CN 114725609A CN 202210368626 A CN202210368626 A CN 202210368626A CN 114725609 A CN114725609 A CN 114725609A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention discloses a novel button lithium battery with safe, reliable and explosion-proof functions, which relates to the field of button lithium batteries and comprises a battery shell, wherein the battery shell comprises a negative electrode lower cover body and a positive electrode shell, the negative electrode lower cover body is provided with a first opening communicated with a containing groove, the positive electrode shell is arranged at the first opening and is sealed to the containing groove, the positive electrode shell and the negative electrode lower cover body are in insulated connection, the novel button lithium battery also comprises an electric core arranged in the containing groove, a positive electrode lug on the electric core is connected with the positive electrode shell, a negative electrode lug on the electric core is connected with the negative electrode lower cover body, the battery shell is provided with a through hole communicated with the containing groove, a safety valve hermetically connected with the through hole is arranged at the through hole, the melting point of the safety valve is lower than that of the battery shell, the melting point difference between the safety valve and the battery shell ensures that the safety valve is cracked in one step first, the explosion-proof performance is more stable, the safety coefficient is higher, and the technical problem that the explosion-proof performance of the button lithium battery is unstable in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of button lithium batteries, in particular to a novel button lithium battery with safe, reliable and explosion-proof functions.
Background
The safety of the current battery is always an important problem concerned by battery manufacturers and users, the conventional button lithium battery generally adopts shell plane nicks to realize exhaust, namely, O-shaped, C-shaped or cross-shaped safety valves are engraved at the bottom in the battery, when the battery is extruded, the internal or external short circuit high-temperature expansion is carried out, the safety valves crack, thereby realizing the exhaust, but the manufacturing requirement of a die for punching nicks required by the mode is high, the difficulty is high, the manufactured nicks are inconsistent in depth, the fall is large, the punched nicks and the pressure-resistant strength of the battery shell are not obviously changed regularly, the technological parameters of the punched nicks are not easy to adjust and master, the stability of the explosion-proof effect of the battery shell is low, and the explosion and fire phenomena of the safety valve failure battery often occur.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a novel button lithium battery with a safe, reliable and explosion-proof function, which solves the technical problem of unstable explosion-proof performance of the button lithium battery in the prior art.
In order to achieve the purpose, the invention provides a novel button lithium battery with safe, reliable and explosion-proof functions, which comprises a battery shell, wherein the battery shell comprises a negative electrode lower cover body and a positive electrode shell, the negative electrode lower cover body is provided with a containing groove, a first opening communicated with the containing groove is formed in one end of the negative electrode lower cover body, the positive electrode shell is arranged at the first opening and is sealed and contained in the containing groove, the button lithium battery also comprises an electric core arranged in the containing groove, a positive electrode lug on the electric core is connected with the positive electrode shell, a negative electrode lug on the electric core is connected with the negative electrode lower cover body, a through hole communicated with the containing groove is formed in the battery shell, a safety valve hermetically connected with the through hole is arranged at the through hole, and the melting point of the safety valve is lower than that of the battery shell.
When using this technical scheme, place electric core in the holding tank earlier, then carry out welded connection with lid under the negative pole ear on the electric core and the negative pole, then with anodal ear on the electric core and 2 welded connection of anodal shell, then install the anodal shell at the first opening part of lid under the negative pole, then with relief valve welded fastening in through-hole department to airtight holding tank.
In the above technical scheme, the through hole is arranged on the negative electrode lower cover body.
Among the above-mentioned technical scheme, still including being provided with the mesopore and installing the annular steel sheet at first opening part, be provided with bellied conductive part on the positive pole shell, positive pole shell and annular steel sheet insulated connection, the conductive part is followed the mesopore and is visited out.
In the above technical scheme, the through hole is arranged on the positive electrode shell.
In the above technical scheme, be provided with the mounting groove on the positive pole shell, the positive pole shell is installed at first opening part and airtight first opening to the outer wall of lid is fixed in the mounting groove under the messenger negative pole.
In the technical scheme, the battery core is a winding core or a stacking core.
In the technical scheme, the insulating layer is arranged between the positive electrode shell and the negative electrode lower cover body, so that the positive electrode shell and the negative electrode lower cover body are conveniently insulated.
In the technical scheme, the positive electrode shell and the negative electrode lower cover body are both steel members, and the steel materials are stable in physical properties, strong in pressure resistance and high in melting point.
In the technical scheme, the safety valve is a copper foil component, an aluminum foil component, a nickel foil component or a tin foil component, and the copper foil component, the aluminum foil component, the nickel foil component or the tin foil component is thin and low in melting point.
In the technical scheme, the thickness of the safety valve is smaller than that of the battery shell, and when the battery fails, the safety valve is thinner than the battery shell, and the melting point of the safety valve is lower than that of the battery shell, so that the safety valve is more convenient to crack and exhaust.
Compared with the prior art, the invention has the beneficial effects that:
when using this technical scheme, when the battery inefficacy in the holding tank or other circumstances lead to the pressure increase in the holding tank, the relief valve is because its melting point is lower than battery case's melting point, will split than the first one step atress of battery case, can exhaust safely, the relief valve of this embodiment is arranged and is exploded through its self physical attribute, melting point difference between relief valve and the battery case, make the relief valve can one step earlier split, make explosion-proof properties more stable, factor of safety is higher, effectively avoid because of the bigger safety problem that the battery explosion arouses, and the electric current to the inside change of battery, the service environment of temperature and battery is highly sensitive, the inside temperature of battery once exceeds the melting point of relief valve, the relief valve is just the exhaust that ftractures, thereby make the relief valve of this embodiment more intelligent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a negative electrode lower cover provided in the present invention;
FIG. 2 is a schematic view of the assembly of a negative electrode lower cover and a positive electrode can according to the present invention;
FIG. 3 is a schematic structural diagram of a novel button lithium battery with a safe, reliable and explosion-proof function provided by the invention;
fig. 4 is a schematic structural view of another negative electrode lower cover provided by the present invention;
fig. 5 is a schematic structural view of another positive electrode can provided by the present invention;
fig. 6 is a schematic view of the assembly of a negative electrode lower cover and a positive electrode can according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of another novel button lithium battery with safe, reliable and explosion-proof functions provided by the invention.
The reference numbers of the figures are: 1. a negative electrode lower cover body; 11. accommodating grooves; 12. a first opening; 2. a positive electrode case; 21. a conductive portion; 22. mounting grooves; 3. an electric core; 4. a safety valve; 6. an insulating layer; 7. an annular steel sheet; 71. a mesopore; 10. a battery case; 101. and a through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Example one
As shown in fig. 1 to fig. 7, the present embodiment provides a novel button lithium battery with safe and reliable explosion-proof function, which includes a battery case 10, a battery cell 3 and a safety valve 4, wherein the battery case 10 includes a negative lower cover 1 and a positive shell 2. Be provided with holding tank 11 under the negative pole on the lid 1, the one end of lid 1 is provided with the first opening 12 of intercommunication holding tank 11 under the negative pole, and positive pole shell 2 is installed in first opening 12 department and with lid 1 sealing connection under the negative pole to make holding tank 11 be airtight space, the use of the battery of being convenient for. The positive electrode shell 2 and the negative electrode lower cover body 1 are in insulated connection, and preferably, an insulating layer 6 is arranged between the positive electrode shell 2 and the negative electrode lower cover body 1, wherein the insulating layer 6 can be insulating glue or insulating glue. Electric core 3 sets up in holding tank 11, and anodal ear on electric core 3 is connected with anodal shell 2, and wherein, electric core 3 can be for rolling up the core, also can be for folding the core, so do not use this as the limit. The negative electrode tab on the battery cell 3 is connected with the negative electrode lower cover body 1, the battery shell 10 is provided with a through hole 101 communicated with the accommodating groove 11, the through hole 101 is provided with a safety valve 4 hermetically connected with the through hole 101, and the melting point of the safety valve 4 is lower than that of the battery shell 10.
Place electric core 3 in holding tank 11 earlier, then carry out welded connection with lid 1 under the negative pole ear on electric core 3 and the negative pole, then with anodal ear on electric core 3 and 2 welded connection of anodal shell, then install anodal shell 2 in the first opening 12 department of lid 1 under the negative pole. The safety valve 4 is then solder-fixed at the through-hole 101 to close the housing groove 11. Preferably, the battery case 10 is provided with a pouring hole through which the battery fluid can be poured into the housing groove 11, and the pouring hole is sealed finally, thereby completing the assembly of the battery of the present embodiment.
As described above, the battery of the present embodiment employs the safety valve 4 having a melting point lower than that of the battery case 10, so that the thin low-melting metal is first broken and decompressed under the pressure of high-temperature expansion during the battery failure process, thereby preventing the battery from exploding at high pressure. Preferably, the positive electrode can 2 and the negative electrode lower cover 1 are both steel members. The steel material has physical stability and stronger compression resistance. The safety valve 4 is preferably a copper foil member or an aluminum foil member or a nickel foil member or a tin foil member. Welding a foil metal having a different melting point from that of the battery case 10 at the through-hole 101 can make the battery safety valve 4 more explosion-proof.
Further, the safety valve 4 of the present embodiment is thinner than the battery case 10. Thus, the safety valve 4 is more convenient to crack and vent when the battery fails because of its thinner thickness and lower melting point. The safety valve 4 of this embodiment is arranged through its self physical attribute and is exploded, and its melting point is low and thickness is thin for explosion-proof performance is more stable, and factor of safety is higher, and the safety valve 4 of this embodiment is more intelligent moreover, and the electric current, temperature, service environment etc. that can effective monitoring battery are highly sensitive to the inside change of battery.
Example two
As shown in fig. 1-fig. 3, this embodiment further provides another novel button lithium battery with safe and reliable explosion-proof function, wherein the through hole 101 is disposed on the negative lower cover 1, and the rest of the structure is the same as that of the first embodiment, and will not be described again.
The present embodiment also preferably includes an annular steel sheet 7, and the annular steel sheet 7 is provided with a central hole 71. The positive electrode case 2 is provided with a conductive portion 21 projecting therefrom. Carry out insulating connection with positive pole shell 2 and annular steel sheet 7 earlier, wherein, insulating layer 6 sets up between positive pole shell 2 and annular steel sheet 7, and conductive part 21 on positive pole shell 2 is followed mesopore 71 and is visited out this moment, then places electric core 3 in holding tank 11, with the welding of negative pole ear and negative pole lower cover body 1 of electric core 3, the welding of positive pole ear and positive pole shell 2 of electric core 3, then install annular steel sheet 7 in first opening 12 department to carry out welded fastening with negative pole lower cover body 1. Thus, the area of the negative electrode lower cover 1 is larger, it is more convenient to provide the through hole 101, and the safety valve 4 is welded at the through hole 101. After the through-hole 101 is provided on the negative electrode lower cover 1, the structure of the positive electrode can 2 can be made simpler and more compact, which facilitates the assembly of the battery.
EXAMPLE III
As shown in fig. 4-7, this embodiment further provides another novel button lithium battery with safe, reliable and explosion-proof functions, wherein the through hole 101 is disposed on the positive electrode casing 2, and the rest of the structure is the same as that of the first embodiment, and will not be described again.
The positive electrode case 2 of the present embodiment is provided with a mounting groove 22. Pack into holding tank 11 with electric core 3 earlier in, then weld under the negative pole ear of electric core 3 and the negative pole lid 1, weld positive ear and anodal shell 2 of electric core 3, install anodal shell 2 in first opening 12 department and airtight first opening 12 after that to make the outer wall of lid 1 fix in mounting groove 22 under the negative pole, at this moment, be provided with insulating layer 6 under anodal shell 2 and the negative pole between the lid 1. Like this, can be convenient for set up through-hole 101 on positive pole shell 2, and with lid 1 assembly back under positive pole shell 2 and the negative pole, the side outer wall of lid 1 will be located mounting groove 22 under the negative pole for lid 1 can be protected by positive pole shell 2 under the negative pole, thereby can improve the intensity of battery, and the relief valve 4 that sets up on the through-hole 101 of positive pole shell 2 is because its thickness is thin, and the melting point is low, thereby it is explosion-proof good, and the security performance is higher.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A novel button lithium battery with safe, reliable and explosion-proof functions comprises a battery shell (10), wherein the battery shell (10) comprises a negative electrode lower cover body (1) provided with a containing groove (11) and a positive electrode shell (2), one end of the negative electrode lower cover body (1) is provided with a first opening (12) communicated with the containing groove (11), the positive electrode shell (2) is arranged at the first opening (12) and seals the containing groove (11), the positive electrode shell (2) is in insulation connection with the negative electrode lower cover body (1), the button lithium battery is characterized by further comprising an electric core (3) arranged in the containing groove (11), a positive electrode lug on the electric core (3) is connected with the positive electrode shell (2), a negative electrode lug on the electric core (3) is connected with the negative electrode lower cover body (1), the battery shell (10) is provided with a through hole (101) communicated with the containing groove (11), the safety valve (4) hermetically connected with the through hole (101) is arranged at the through hole (101), and the melting point of the safety valve (4) is lower than that of the battery shell (10).
2. The novel button lithium battery with safe, reliable and explosion-proof functions as claimed in claim 1 is characterized in that the through hole (101) is arranged on the negative lower cover body (1).
3. The novel button lithium battery with the safe, reliable and explosion-proof functions as claimed in claim 2, further comprising an annular steel sheet (7) provided with a central hole (71) and arranged at the first opening (11), wherein the positive electrode shell (2) is provided with a raised conducting part (21), the positive electrode shell (2) is in insulated connection with the annular steel sheet (7), and the conducting part (21) protrudes from the central hole (71).
4. A novel button lithium battery with safe, reliable and explosion-proof function as claimed in claim 1, characterized in that the through hole (101) is arranged on the positive shell (2).
5. The novel button lithium battery with safe, reliable and explosion-proof functions as claimed in claim 4, characterized in that the positive casing (2) is provided with a mounting groove (22), the positive casing (2) is installed at the first opening (11) and seals the first opening (11), so that the outer wall of the negative lower cover body (1) is fixed in the mounting groove (22).
6. The novel button lithium battery with safe, reliable and explosion-proof functions as claimed in claim 1, characterized in that the battery cell (3) is a roll core or a stacked core.
7. The novel button lithium battery with safe, reliable and explosion-proof functions as claimed in claim 1 is characterized in that an insulating layer (6) is arranged between the positive electrode shell (2) and the negative electrode lower cover body (1).
8. The novel button lithium battery with safe, reliable and explosion-proof functions as claimed in claim 1 is characterized in that the positive electrode shell (2) and the negative electrode lower cover body (1) are both steel members.
9. The new type button lithium battery with safe and reliable explosion-proof function as claimed in claim 8 is characterized in that the safety valve (4) is a copper foil member or an aluminum foil member or a nickel foil member or a tin foil member.
10. A novel lithium button cell with safe and reliable explosion-proof function according to any one of claims 1 to 9, characterized in that the thickness of the safety valve (4) is thinner than that of the cell housing (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210368626.2A CN114725609A (en) | 2022-04-09 | 2022-04-09 | Novel button type lithium battery with safe, reliable and explosion-proof functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210368626.2A CN114725609A (en) | 2022-04-09 | 2022-04-09 | Novel button type lithium battery with safe, reliable and explosion-proof functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114725609A true CN114725609A (en) | 2022-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210368626.2A Pending CN114725609A (en) | 2022-04-09 | 2022-04-09 | Novel button type lithium battery with safe, reliable and explosion-proof functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114725609A (en) |
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2022
- 2022-04-09 CN CN202210368626.2A patent/CN114725609A/en active Pending
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