CN111261828A - Safety valve with built-in battery core and lithium battery using same - Google Patents
Safety valve with built-in battery core and lithium battery using same Download PDFInfo
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- CN111261828A CN111261828A CN202010374787.3A CN202010374787A CN111261828A CN 111261828 A CN111261828 A CN 111261828A CN 202010374787 A CN202010374787 A CN 202010374787A CN 111261828 A CN111261828 A CN 111261828A
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- tab
- glue
- battery cell
- safety valve
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
-
- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
Abstract
The invention provides a safety valve with a built-in battery cell and a lithium battery using the safety valve. The valve comprises a built-in battery cell valve and a lithium battery. The tab overlapping area is of a partially hollow structure, the tab glue is thermosensitive glue to form a thermosensitive glue coating, the tab glue is thermosensitive glue, and the tab overlapping area is of a partially hollow structure to form a regional thermosensitive glue coating. The invention has the beneficial effects that: the invention starts from battery design, provides a scheme for preventing the polymer lithium ion battery from generating thermal runaway, and can block the combustion safety risk of the polymer lithium ion battery caused by the thermal runaway at high temperature.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a safety valve arranged in a battery cell and a lithium battery using the safety valve.
Background
At present, lithium ion batteries have excellent characteristics such as high energy density, long cycle life, and wide temperature adaptability, and therefore have been more widely used in the fields of smart wear, mobile phones, PCs, electric vehicles, and the like in recent years. However, with the continuous increase of energy density, the voltage of the active material of the lithium ion battery is continuously increased, the inert space is squeezed, and the safety and reliability of the lithium ion battery are also concerned more and more.
Disclosure of Invention
The invention provides a safety valve with a built-in battery cell and a lithium battery using the safety valve, which are used for solving the problem of low safety of a lithium ion battery in the prior art.
The safety valve with the built-in battery cell is characterized by comprising a pole lug and pole lug glue, wherein the pole lug is in hot-melt sealing bonding through the pole lug glue; wherein the content of the first and second substances,
the tab glue and the tab bonding area are tab overlapping areas.
As an embodiment of the present invention: the tab glue in the tab overlapping area has a partially hollow structure.
As an embodiment of the present invention: the tab glue is thermosensitive glue.
As an embodiment of the present invention: the tab glue is a thermosensitive glue, and the thermosensitive glue in the tab overlapping area is of a partially hollow structure.
As an embodiment of the present invention: the tabs comprise a positive tab and a negative tab; wherein the tabs comprise a positive tab and a negative tab; wherein the content of the first and second substances,
the positive electrode lug is an aluminum lug;
the negative pole tab is a copper nickel-plated tab;
the tabs are universal in size; wherein
The general dimensions of the tabs include 5 x 10mm, 5 x 9mm, 5 x 8mm, 5 x 11mm, 5.5 x 11mm or 7.5 x 11 mm.
As an embodiment of the present invention: the tab glue is a special-shaped tab glue; wherein the content of the first and second substances,
the special-shaped tab glue is provided with an upward exhaust duct in the transverse direction;
the glue layer of the special-shaped tab glue comprises a shallow thin glue layer.
As an embodiment of the present invention: the size of the tab glue is general size, and the general size of the tab glue comprises 5 × 10mm, 5 × 9mm, 5 × 8mm, 5 × 11mm, 5.5 × 11mm or 7.5 × 11 mm.
As an embodiment of the present invention: the tab glue comprises a first hollow part and a second hollow part; wherein the content of the first and second substances,
the first hollow part is retracted 0.5-2 mm towards the left area and the right area of the pole lug by taking the pole lug in the area where the pole lugs are overlapped as a reference to form a first hollow part;
the second hollow part is contracted by 0.5-2 mm towards the upper area and the lower area of the tab glue edge by taking the tab glue edge of the area where the tabs are overlapped as a reference to form a second hollow part;
the thickness of the first hollow part and the second hollow part is 5-50% of the overall thickness of the tab glue.
As an embodiment of the present invention:
the spraying shape of the thermosensitive adhesive adopts a point shape or a linear shape;
the thickness of the glue layer sprayed by the thermosensitive adhesive is 1-5 um;
the heat-sensitive adhesive is at least prepared from one or more of foaming adhesive, polyethylene-vinyl acetate, polyurethane and polyester, and the generation temperature of the heat-sensitive adhesive is 130-200 ℃.
The utility model provides a lithium cell, adopts above-mentioned electric core to embed safety valve, includes: the battery cell, the built-in safety valve of the battery cell and the aluminum plastic film; wherein the content of the first and second substances,
the battery cell built-in safety valve is arranged on the battery cell;
the battery cell comprises a positive plate and a negative plate, the positive plate and the negative plate are respectively connected with a lug of a safety valve arranged in the battery cell, and the battery cell is connected with external equipment through the lug;
the aluminum-plastic film is used for packaging the tab;
the tab is bonded and fixed with the area packaged by the aluminum plastic film and the tab through tab glue;
the temperature change rate of the battery cell composition material is lower than that of the thermosensitive adhesive of the built-in safety valve of the battery cell.
The invention has the beneficial effects that: the invention provides a safety valve for preventing a polymer lithium ion battery from thermal runaway starting from battery design, and the safety valve can block the combustion safety risk of the polymer lithium ion battery caused by the thermal runaway at high temperature. The invention provides 3 different tab glue designs, so that safety accidents such as heat loss and the like during heat abuse are realized in the design, and the safety and reliability of the lithium ion battery are improved. The three structures can be completed when the tab is treated, the production process of the lithium ion battery cannot be changed, and the lithium ion battery tab treatment device is simple and convenient to operate and easy to popularize.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
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 specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a general valve structure diagram of a safety valve for preventing thermal runaway of a lithium ion battery in an embodiment of the invention;
FIG. 2 is a schematic diagram of a special-shaped processing area of a safety valve for preventing thermal runaway of a lithium ion battery according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a partial thermal adhesive coating of a safety valve for preventing thermal runaway of a lithium ion battery according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a thermal sensitive adhesive coating in a profiled region of a safety valve for preventing thermal runaway of a lithium ion battery according to an embodiment of the present invention;
reference numerals:
the battery comprises a battery core 1, a tab adhesive 2, a tab 3, a safety valve 4, a special-shaped area 5, a local thermosensitive adhesive coating 6 and a special-shaped area thermosensitive adhesive coating 7.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1: as shown in the attached drawing 1, the invention relates to a safety valve with a built-in battery cell, which comprises a tab 3 and tab glue 2, wherein the tab 3 is hot-melted, sealed and bonded through the tab glue 2; wherein the content of the first and second substances,
the bonding area of the tab glue 2 and the tab 3 is a tab overlapping area.
The principle of the invention is as follows: the invention relates to a safety valve which is arranged in a battery cell and prevents the safety risk of combustion when the battery cell encounters high-temperature abnormity. The invention provides a novel tab adhesive based on the characteristics of a soft package lithium ion battery cell, the novel tab adhesive and a tab overlapped area are processed to construct a battery cell built-in safety valve, and in the prior art, tabs of the lithium ion battery are packaged by an aluminum plastic film and then are sealed and bonded by the tab adhesive to realize soft packaging.
The invention has the beneficial effects that: the invention aims to reduce the bonding strength of the tab 3 and the tab glue 2 and effectively prevent the battery from burning when the battery core encounters continuous abnormal high temperature.
Example 2:
as an embodiment of the present invention: the tab glue 2 in the tab overlapping area has a partially hollow structure. The partially hollow structure is shown in the profiled region 5 of figure 2. In the embodiment, the special-shaped area 5 is formed mainly by processing the tab glue 2.
In the first design scheme of the invention, a special-shaped structure is constructed in the overlapping area of the lugs, and the construction mode of the special-shaped structure is that the lug glue 2 at two sides is subjected to thickness thinning treatment in a certain area in the area where the lugs are overlapped with each other to form the locally hollow special-shaped lug glue;
the principle of the first design scheme of the invention is as follows: the tab glue in the tab overlapping area is arranged into a partial hollow structure, so that the bonding force of a bonding part is reduced; utmost point ear glue 2 has the characteristics of local glue film attenuate in the design, can bond with the horizontal power in glue film bonding region by effectual reduction utmost point ear 3, and during high temperature, the inside can produce gas of lithium ion battery, when gaseous reaches a certain volume, can glue 2 this weak regions to utmost point ear and produce the impact, then breaks through the apex seal district, and the apex seal district breaks the back, and the inside gas content of electric core sharply reduces, and leads to lacking inflammable gas, has prevented that electric core from burning.
The invention has the beneficial effects that: the invention can break the peak area when the lithium ion battery generates gas at high temperature, so that inflammable gas is lacked, and the battery core is prevented from burning. The tab glue in the overlapping area is arranged to be partially hollow, so that the bonding force of the bonding position is reduced.
Example (b): 3
As an embodiment of the present invention: the tab glue 2 is a thermosensitive glue. As shown in fig. 3, a partial thermal adhesive coating 6 is formed.
In a second aspect of the present invention, the local thermosensitive adhesive coating is formed by applying the thermosensitive adhesive to the inside of the tab overlapping region. The local thermosensitive adhesive coating is constructed by coating thermosensitive adhesive in the overlapped area of the tab adhesive 2 and the tab 3.
The principle of the invention is as follows: the tab glue at the welding position of the tab 3 and the aluminum plastic film is designed by adopting a local thermosensitive glue layer, and the design is mainly characterized in that the tab glue 2 is made of thermosensitive glue, the processed positions are that the tab 3 is respectively retracted by 0.5-2 mm in the left area and the right area, and the edge of the tab glue 2 is respectively retracted by 0.5-2 mm in the upper area and the lower area.
The invention has the beneficial effects that: after the temperature reaches the temperature of the thermosensitive adhesive coating, the thermosensitive adhesive layer can be automatically dissolved, the expansion is separated from the lug, the top sealing area is broken, and the combustion of the battery core can be effectively prevented.
Example 4:
as an embodiment of the present invention: the tab glue 2 is a thermosensitive glue, and the thermosensitive glue in the tab overlapping area is of a special-shaped structure with a hollow part. As shown in fig. 4, the present solution forms a profiled area thermal sensitive adhesive coating 7.
The third design scheme of the invention is mainly to treat the heat-sensitive adhesive coating of the local hollow area, namely, a special-shaped area is constructed in the overlapped area of the lugs under the condition that the lug adhesive 2 is the heat-sensitive adhesive; the inner part of the area is coated with heat-sensitive glue, and the special-shaped heat-sensitive glue processing area 7 of the area shown in figure 4 is formed.
The principle of the invention is as follows: the invention adopts the composite design of local hollowness and a thermosensitive adhesive layer for the tab glue 2 at the welding part of the tab 3 and an aluminum plastic film, and the design is mainly characterized in that the hollow design is carried out on the local part in the overlapping area of the tab 3 and the tab glue 2, the hollow area refers to a first design scheme, and the local hollowness treatment is carried out on the overlapping area of the tab under the condition that the tab glue is the thermosensitive glue.
The invention has the beneficial effects that: the local hollow and thermosensitive adhesive layer is subjected to composite treatment, so that the lithium ion battery can be more effectively protected from heat abuse, and the lithium ion battery is more suitable for high-capacity lithium ion batteries with strong requirements on safety and reliability.
When the thermal sensitive adhesive is used in the three design schemes of the invention, the generation temperature can be set. And the special-shaped structure can burst the top sealing area due to gas. When the lithium ion battery is at an abnormal high temperature (for example, the temperature is larger than or equal to 130 ℃), on one hand, a large amount of gas can be generated in the lithium ion battery under the influence of the high temperature, and the gas can be accumulated to a certain degree in a processing area (shown in attached figures 2, 3 and 4) of the lug, namely a top seal is broken in a special-shaped area, the battery is damaged and leaked, and the battery combustion risk under the continuous high temperature is effectively prevented.
Example 5:
as an embodiment of the present invention: the tabs 3 comprise positive tabs and negative tabs; wherein the content of the first and second substances,
the positive electrode lug is an aluminum lug;
the negative pole tab is a copper nickel-plated tab;
the tabs are universal in size; wherein
The general dimensions of the tabs include 5 x 10mm, 5 x 9mm, 5 x 8mm, 5 x 11mm, 5.5 x 11mm or 7.5 x 11 mm.
The novel tab adopted by the tab 3 and the area packaged by the aluminum plastic film is specially designed, and the negative electrode tab is a copper nickel-plated tab, so that the tab has strong adhesiveness, the adhesion stability can be improved, and the flexibility can be prevented from being removed. The size of the electrode lug 3 with the universal type can be universally applied to the existing lithium ion battery.
Example 6:
as an embodiment of the present invention: the tab glue 2 is a special-shaped tab glue; wherein the content of the first and second substances,
the special-shaped tab glue is provided with an upward exhaust duct in the transverse direction
The glue layer of the special-shaped tab glue comprises a shallow thin glue layer.
The special-shaped tab glue can prevent the phenomenon that the packaging is abnormal due to the fact that hollow gas is difficult to discharge during welding, and an upward exhaust duct is added under the condition of transverse local treatment in the specific design. Heterotypic utmost point ear is glued, this design characteristics lie in local glue film attenuate, for anomalous glue film design, can bond with the horizontal power in glue film bonding region by effectual reduction utmost point ear 3, during high temperature, the inside can produce gas of lithium ion battery, when gaseous reaches certain volume, can glue this weak region to utmost point ear and produce the impact, then break the top seal district, the back is broken in the top seal district, the inside gas content of electricity core sharply reduces, and lead to lacking combustible gas, has prevented that electric core from burning.
Example 7:
as an embodiment of the present invention: when the tab glue 2 is actually implemented, a 3-layer structure can be set:
comprising a polymer layer, a conductive layer and a heat sink layer, wherein,
the polymer layer is attached to the lower side of the conductive layer, and the heat dissipation layer wraps the polymer layer and the conductive layer;
the conductive layer is composed of a conductive metal;
the heat dissipation layer comprises a heat conduction silicon layer and a nano carbon layer;
the polymer layer at least comprises polyethylene, polyhydroxyacetyl ethylenediamine and polyvinyl methyl ether which are fused.
The arrangement of the special-shaped pole lug glue 2 for processing the hollow inside also designs the structure of the special-shaped pole lug glue, and the pole lug glue 2 with a three-layer structure is arranged, wherein,
the polymer layer can effectively prevent corrosion and oxidation.
The conducting layer can ensure that the special-shaped tab glue does not influence the power supply range of the battery cell 1;
the heat dissipation layer can strengthen the heat dissipation efficiency of the lithium ion battery under the condition that the electric core 1 is independently cooled, and further prevent high temperature danger.
Example 8:
as an embodiment of the present invention: the size of the tab glue 2 is general size, and the general size of the tab glue includes but is not limited to 5 × 10mm, 5 × 9mm, 5 × 8mm, 5 × 11mm, 5.5 × 11mm, 7.5 × 11 mm.
The size of the tab glue 2 with the universal type can be universally applied to the existing lithium ion battery.
Example 9:
as an embodiment of the present invention: the structure of the tab glue 2, namely, the first hollow part and the second hollow part included in the area 5; wherein the content of the first and second substances,
the first hollow part is retracted 0.5-2 mm towards the left area and the right area of the tab 3 by taking the tab 3 in the area where the tabs are overlapped as a reference to form a first hollow part;
the second hollow part is contracted by 0.5-2 mm towards the upper area and the lower area of the edge of the tab glue 2 by taking the edge of the tab glue 2 in the area where the tabs 3 are overlapped as a reference to form a second hollow part;
the thickness of the first hollow part and the second hollow part is 5-50% of the overall thickness of the tab glue 2.
The principle of the invention is as follows: the invention is characterized in that the special-shaped area of the tab glue 2 is designed, the design is mainly characterized in that the partial hollow treatment is carried out in the overlapping area of the tab 3 and the tab glue, the hollow treatment positions are that the left area and the right area respectively contract 0.5-2 mm by taking the tab 3 as a reference, the upper area and the lower area respectively contract 0.5-2 mm by taking the edge of the tab glue as a reference, and the thickness of the hollow treatment is 5-50% of the integral thickness of the tab glue.
The invention has the beneficial effects that: the area design of the invention ensures that a large amount of gas is generated in the lithium ion battery core under the influence of high temperature, the gas is accumulated in the area, the direct explosion of the lithium ion battery is indirectly prevented, and the accumulated gas is directly diffused when the thermosensitive adhesive is melted due to the setting of the threshold temperature of the thermosensitive adhesive, thereby forming the safety valve.
Example 10:
as an embodiment of the present invention: and forming a heat-sensitive adhesive layer after coating; wherein the content of the first and second substances,
the shape of the thermal sensitive adhesive spray is dotted or linear;
the thickness of the adhesive layer of the thermosensitive adhesive is 1-5 um;
the heat-sensitive adhesive is at least prepared from one or more of foaming adhesive, polyethylene-vinyl acetate, polyurethane and polyester, and the generation temperature of the heat-sensitive adhesive is 130-200 ℃.
The invention has the beneficial effects that: the dots or lines have certain uncovered areas, which can dissipate heat to some extent. The foaming agent has viscosity, and alkene-vinyl acetate, polyurethane and polyester are taken as polymers, so that the foaming agent has the capabilities of preventing corrosion and radiation. Thereby extending battery life. The heat-sensitive glue is heat-sensitive glue, and the emergence temperature is that 130~200 ℃ sets for the emergence temperature interval, and after the temperature reached the emergence temperature, the heat-sensitive glue layer can dissolve automatically, and expanded abnormal shape is regional 5 and utmost point ear 3 separation, and the top seal district breaks, can effectually prevent the burning of electricity core. The thickness of the thermosensitive adhesive layer is set according to actual conditions, and heat can be rapidly released when the threshold temperature is reached.
Example 11:
the utility model provides a lithium cell, has adopted the built-in safety valve of above-mentioned electric core, includes: the battery cell 1, the built-in safety valve 4 of the battery cell and the aluminum plastic film; wherein the content of the first and second substances,
the battery cell built-in safety valve 4 is arranged on the battery cell 1;
the battery cell 1 comprises a positive plate and a negative plate, the positive plate and the negative plate are respectively connected with a tab 3 of the battery cell built-in safety valve 4, and the battery cell 1 is connected with external equipment through the tab 3 of the battery cell built-in safety valve 4;
the aluminum-plastic film is used for packaging a lug 3 of the safety valve 4 arranged in the battery cell;
and a tab 3 of the safety valve 4 arranged in the battery cell is fixed with the area packaged by the aluminum plastic film and the tab 3 through a tab glue 2.
According to the invention, the lithium ion battery suitable for the safety valve 4 built in the battery core is selected through the safety valve 4 built in the battery core.
The temperature change rate of the battery cell composition material is lower than that of the built-in safety valve thermosensitive adhesive.
In the invention, the battery core 1 can generate heat, so that the heat-sensitive adhesive can reach a melting point more quickly only when the temperature change rate of the battery core 1 is lower than that of the heat-sensitive adhesive, heat dissipation is realized, the battery core cannot be burnt, and the temperature of the heat-sensitive adhesive can play a role.
The selection of the cell material in the invention comprises the following steps:
step 1: according to the specific heat capacity of the constituent materials of the thermosensitive adhesive
Quality of thermal sensitive adhesive
Determining the specific heat capacity of the thermal sensitive adhesive
:
step 2: according to the specific heat capacity of the thermosensitive adhesive
Determining the temperature rate of the thermal sensitive adhesive per unit time
：
and step 3: obtaining the working current of the battery cell 1 during working
The operating voltage of the cell 1
(ii) a Calculating the temperature generated by the battery cell 1 as
:
And 4, step 4: according to the temperature generated in the unit time of the battery cell 1
:
Acquisition instituteThe volume of the battery cell 1 during operation
Open circuit voltage of the cell 1
Temperature coefficient of influence of the cell 1
And the initial passage temperature of the cell 1
And calculating the rate of the temperature absorbed by the battery cell 1
：
wherein when
And when the temperature is higher than the heat absorption rate of the battery cell, the battery cell 1 reaches the threshold temperature of the built-in safety valve of the battery cell more slowly than the temperature sensitive adhesive.
This process explains a process that electric core 1 and temperature sensitive adhesive match, promptly, electric core and temperature sensitive adhesive accord with the temperature sensitive adhesive and can be faster reach the threshold temperature of the built-in safety valve of electric core.
The process comprises five steps: calculating the specific heat capacity of the thermosensitive adhesive
Calculating the temperature rise rate of the thermal sensitive adhesive in unit time
(ii) a Calculating the temperature generated by the battery cell 1 as
Rate of temperature generation by the cell 1
: and finally determining whether the temperature rise rate of the thermal sensitive adhesive is greater than that of the battery cell 1. The function is as follows: and determining whether the battery core 1 and the built-in safety valve of the battery core can be matched or not according to the ratio in the selection of the component materials of the battery core 1 of the lithium ion battery.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The safety valve with the built-in battery cell is characterized by comprising a tab (3) and tab glue (2), wherein the tab (3) is hot-melted, sealed and bonded through the tab glue (2); wherein the content of the first and second substances,
the bonding area of the tab glue (2) and the tab (3) is a tab overlapping area.
2. The safety valve with built-in battery cell according to claim 1, wherein the tab glue (2) in the tab overlapping area has a partially hollow structure.
3. The safety valve with a built-in battery cell according to claim 1, wherein the tab glue (2) is a thermosensitive glue.
4. The safety valve with the built-in battery cell of claim 1, wherein the tab glue (2) is a thermal sensitive glue, and the thermal sensitive glue in the tab overlapping area is of a partially hollow structure.
5. The cell-embedded safety valve according to claim 1,
the tabs (3) comprise positive tabs and negative tabs; wherein the content of the first and second substances,
the positive electrode lug is an aluminum lug;
the negative pole tab is a copper nickel-plated tab;
the tab (3) is universal in size; wherein the content of the first and second substances,
the general dimensions of the tabs (3) include 5 × 10mm, 5 × 9mm, 5 × 8mm, 5 × 11mm, 5.5 × 11mm or 7.5 × 11 mm.
6. The safety valve with the built-in battery cell of claim 2 or 4, wherein the tab glue (2) is a special-shaped tab glue; wherein the content of the first and second substances,
the special-shaped tab glue is provided with an upward exhaust duct in the transverse direction;
the glue layer of the special-shaped tab glue comprises a shallow thin glue layer.
7. The safety valve with built-in cell according to claim 1, wherein the tab paste (2) has a common size, and the common size of the tab paste (2) comprises 5 × 10mm, 5 × 9mm, 5 × 8mm, 5 × 11mm, 5.5 × 11mm, or 7.5 × 11 mm.
8. The safety valve with built-in battery cell of claim 1, characterized in that the tab glue (2) comprises a first hollow part and a second hollow part; wherein the content of the first and second substances,
the first hollow part is retracted by 0.5-2 mm towards the left area and the right area of the tab (3) by taking the tab (3) in the area where the tabs (3) are overlapped as a reference to form a first hollow part;
the second hollow part is contracted by 0.5-2 mm towards the upper area and the lower area of the edge of the tab glue (2) by taking the edge of the tab glue (2) in the area where the tabs (3) are overlapped as a reference to form a second hollow part;
the thickness of the first hollow part and the second hollow part is 5-50% of the overall thickness of the tab glue (2).
9. The safety valve with an embedded battery cell according to claim 3 or 4, wherein the thermal sensitive adhesive is sprayed in a dot or linear shape;
the thickness of the glue layer sprayed by the thermosensitive adhesive is 1-5 um;
the heat-sensitive adhesive is at least prepared from one or more of foaming adhesive, polyethylene-vinyl acetate, polyurethane and polyester, and the generation temperature of the heat-sensitive adhesive is 130-200 ℃.
10. A lithium battery using the cell-embedded safety valve according to any one of claims 1 to 9, comprising: the battery cell comprises a battery cell (1), a safety valve (4) arranged in the battery cell and an aluminum plastic film; wherein the content of the first and second substances,
the battery cell built-in safety valve (4) is arranged on the battery cell (1);
the battery cell (1) comprises a positive plate and a negative plate, the positive plate and the negative plate are respectively connected with a lug (3) of a safety valve (4) arranged in the battery cell, and the battery cell (1) is connected with external equipment through the lug (3);
the aluminum plastic film is used for packaging the tab (3);
the tab (3) is bonded and fixed with the area packaged by the aluminum plastic film and the tab (3) through a tab glue (2);
the temperature change rate of the battery cell (1) composition material is lower than that of the thermosensitive adhesive of the battery cell built-in safety valve (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010374787.3A CN111261828A (en) | 2020-05-07 | 2020-05-07 | Safety valve with built-in battery core and lithium battery using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010374787.3A CN111261828A (en) | 2020-05-07 | 2020-05-07 | Safety valve with built-in battery core and lithium battery using same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112701424A (en) * | 2020-12-29 | 2021-04-23 | 珠海冠宇电池股份有限公司 | Tab, battery cell and rosin joint identification method |
| CN114497872A (en) * | 2022-01-29 | 2022-05-13 | 宁德新能源科技有限公司 | Electrochemical device and electronic device including the same |
| WO2022110142A1 (en) * | 2020-11-30 | 2022-06-02 | 东莞新能安科技有限公司 | Battery and electric device |
| WO2023077353A1 (en) * | 2021-11-04 | 2023-05-11 | 微宏动力系统（湖州）有限公司 | Soft pack battery |
| WO2023123036A1 (en) * | 2021-12-29 | 2023-07-06 | 宁德新能源科技有限公司 | Sealant, cell, battery, and electrical device |
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Application publication date: 20200609 |