CN220106842U - Battery cell and battery - Google Patents
Battery cell and battery Download PDFInfo
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- CN220106842U CN220106842U CN202321683495.3U CN202321683495U CN220106842U CN 220106842 U CN220106842 U CN 220106842U CN 202321683495 U CN202321683495 U CN 202321683495U CN 220106842 U CN220106842 U CN 220106842U
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- pole piece
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- 239000002985 plastic film Substances 0.000 claims abstract description 16
- 229920006255 plastic film Polymers 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 239000003292 glue Substances 0.000 claims description 32
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- 238000002844 melting Methods 0.000 claims description 13
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- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 description 13
- 230000001070 adhesive effect Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 238000004804 winding Methods 0.000 description 8
- 229910000838 Al alloy Inorganic materials 0.000 description 6
- 238000003475 lamination Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910001128 Sn alloy Inorganic materials 0.000 description 4
- 239000006256 anode slurry Substances 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 4
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000676 Si alloy Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 3
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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- 229910002804 graphite Inorganic materials 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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 utility model provides a battery cell and a battery, wherein the battery cell comprises a first tab, a second tab, a first pole piece, a second pole piece and an aluminum-plastic film, and the first tab is connected with the first pole piece; the second lug is connected with the second pole piece; the aluminum-plastic film is used for forming a shell for wrapping the first pole piece and the second pole piece, and is provided with a top sealing edge for penetrating out the first pole lug and the second pole lug; the first tab and/or the second tab are/is provided with a first part and a second part, and the overcurrent area of the first part on the same tab is smaller than that of the second part. So set up, can increase the resistance of first branch, then when the electric core takes place external short circuit, the electric current is very big, and because the resistance of first branch is big, first branch can rise temperature sharply, breaks off after reaching the fusing point, cuts off the passageway, avoids electric core thermal runaway's problem, improves the security performance when electric core takes place the short circuit.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery cell and a battery.
Background
Along with the development of new energy technology, the lithium ion secondary battery is widely applied with the advantages of high energy density, long cycle life and the like, the energy density of the lithium ion secondary battery is higher and higher, along with the development of battery technology and the improvement of fast charge demand, the internal resistance of the battery is smaller and smaller, thousands of amperes of current can be generated even when the external short circuit happens, and the problems that the current is large, the internal rapid heat generation of the battery possibly causes thermal runaway of the battery when the external short circuit happens to the soft package battery exist are solved.
Disclosure of Invention
In view of this, the utility model provides a battery cell, in which a first branch is arranged on a tab, when a short circuit occurs between the first tab and a second tab, the current is large, and the resistance of the first branch is large and can be raised until the first branch is fused, so that the passage is cut off, and the problem of thermal runaway of the battery cell is avoided.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a battery, comprising:
the first tab is connected with the first pole piece;
the second lug is connected with the second pole piece;
the aluminum plastic film is used for forming a shell for coating the first pole piece and the second pole piece, and is provided with a top edge sealing for penetrating out the first pole lug and the second pole lug;
the first tab and/or the second tab are/is provided with a first part and a second part, and the overcurrent area of the first part on the same tab is smaller than that of the second part.
Preferably, the thickness of the first portion on the same tab is smaller than the thickness of the second portion, or the thickness and width of the first portion are smaller than the thickness and width of the second portion.
Preferably, the thickness and width of the first subsection satisfy the formula:
wherein w is the width of the first subsection, d is the thickness of the first subsection, ρ Electric power And V is the lower limit voltage of the battery cell, T is the fusing time, deltaT is the temperature difference between the melting point temperature of the first tab or the second tab and the external short circuit, ρ is the density of the first tab or the second tab, cp is the specific heat capacity of the first tab or the second tab, and R is the internal resistance of the battery.
Preferably, the battery cell comprises tab glue, the tab glue is coated on the first tab and the second tab, and the first tab and the second tab are bonded with the top edge seal through the tab glue; the first subsection is at least partially provided with tab glue.
Preferably, the battery cell comprises tab glue, the tab glue is coated on the first tab and the second tab, and the first tab and the second tab are bonded with the top edge seal through the tab glue; the first subsection is located inside the housing.
Preferably, the battery cell comprises tab glue, the tab glue is coated on the first tab and the second tab, and the first tab and the second tab are bonded with the top edge seal through the tab glue; the first subsection is located outside the housing.
Preferably, the width of the first subsection is 1mm or more.
Preferably, the thickness of the first subsection is greater than or equal to 0.08mm.
Preferably, the height of the first subsection is greater than or equal to 2mm and less than 1/5 of the height of the tab provided with the first subsection.
Preferably, the first subsection is arranged on the positive electrode lug.
A battery comprising a cell as claimed in any one of the preceding claims.
The battery cell provided by the utility model comprises a first tab, a second tab, a first pole piece, a second pole piece and an aluminum plastic film, wherein the first tab is connected with the first pole piece; the second lug is connected with the second pole piece; the aluminum-plastic film is used for forming a shell for wrapping the first pole piece and the second pole piece, and is provided with a top sealing edge for penetrating out the first pole lug and the second pole lug; the first tab and/or the second tab are/is provided with a first part and a second part, and the overcurrent area of the first part on the same tab is smaller than that of the second part. So set up, can increase the resistance of first branch, then when the electric core takes place external short circuit, the electric current is very big, and because the resistance of first branch is big, first branch can rise temperature sharply, breaks off after reaching the fusing point, cuts off the passageway, avoids electric core thermal runaway's problem, improves the security performance when electric core takes place the short circuit.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a front view of a battery cell according to the present embodiment;
fig. 2 is a front view of the first tab and the tab adhesive provided in the present embodiment;
FIG. 3 is a cross-sectional view taken along line 2 A-A;
fig. 4 is a front view of a battery cell provided in another embodiment;
fig. 5 is a front view of a first tab and tab adhesive according to another embodiment.
In fig. 1-5:
1. a first tab; 11. a first subsection; 12. a second subsection; 2. a second lug; 3. an aluminum plastic film; 4. tab glue; 5. and (5) a winding structure.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the present utility model, wt represents the width of the second segment 12, ht represents the height of the first pole piece 1, w represents the width of the first segment 11, d represents the thickness of the first segment 11, h represents the height of the first segment 11, hg represents the height of the tab adhesive 4.
In the present utility model, the width, thickness, flow area, cross-sectional area, and dimension of the first and second sections 11 and 22 are compared, and the first and second sections 11 and 22 located on the same tab are referred to.
As shown in fig. 1-5, the embodiment of the utility model provides a battery cell, which comprises a first tab 1, a second tab 2, a first pole piece, a second pole piece and an aluminum plastic film 3, wherein the first tab 1 is connected with the first pole piece; the second lug 2 is connected with the second pole piece; the aluminum plastic film 3 is used for forming a shell for wrapping the first pole piece and the second pole piece, and is provided with a top sealing edge for penetrating out the first pole lug 1 and the second pole lug 2; the first tab 1 and/or the second tab 2 are provided with a first portion 11 and a second portion 12, and the overcurrent area of the first portion 11 located on the same tab is smaller than that of the second portion 12.
Specifically, the first tab 1 is provided with a first part 11 and a second part 12, or the second tab 2 is provided with the first part 11 and the second part 12, or the first tab 1 and the second tab 2 are provided with the first part 11 and the second part 12. By making the area of the first subsection 11 smaller than the area of the second subsection 12, the area of the overcurrent refers to the cross-sectional area of the current flowing in the circuit, that is to say the size of the first subsection 11 is smaller than the size of the second subsection 12, and in other words, the area of the overcurrent can also be expressed by the cross-sectional area of the cross-sectional view as shown in fig. 3. Here, the width w, the thickness d of the first part 11 may be reduced or the thickness w and the width d of the first part 11 may be reduced at the same time, so that the overcurrent area of the first part 11 is smaller than that of the second part 12; of course, the flow area of the second section 12 may be increased so that the flow area of the first section 11 is smaller than the flow area of the second section 12. Here, the first division 11 may be formed by reducing the size of both sides of the tab (as shown in fig. 1 to 5) or the first division 11 may be formed by punching holes in the tab (not shown).
In addition, as for the material of the first section 11, the material of the first section 11 may be a material having a low melting point and being electrically conductive, for example: lead-tin alloys, aluminum, magnesium-aluminum alloys, aluminum-silicon alloys, cadmium, and the like. The aluminum plastic film 3 is used for wrapping the outer sides of the first pole piece and the second pole piece, and the first pole lug 1 and the second pole lug 2 penetrate out from the positions of top edges (not shown in the figure) of the aluminum plastic film 3, which are used for wrapping the first pole lug 1 and the second pole lug 2.
The second portion 12 refers to the remaining portion of the tab from which the first portion 11 is removed.
Further, when the first portion 11 is disposed on the positive electrode tab, the material of the positive electrode tab is generally aluminum or aluminum alloy, and the material of the first portion 11 may be aluminum or aluminum alloy same as the positive electrode tab, or may be lead-tin alloy or cadmium. When the first portion 11 is disposed on the negative electrode tab, nickel, copper or alloy thereof is generally used as the material of the negative electrode tab, and the material of the first portion 11 may be nickel, copper or alloy thereof, or lead-tin alloy, aluminum, magnesium-aluminum alloy, aluminum-silicon alloy, cadmium or the like with a lower melting point.
According to the battery cell with the structure, the overcurrent area of the first subsection 11 on the same tab is smaller than that of the second subsection 12, so that the resistance of the first subsection 11 can be increased, when the battery cell is in external short circuit, the current is large, and because the resistance of the first subsection 11 is large, the first subsection 11 is rapidly heated, is disconnected after reaching the melting point, and is cut off, the first subsection 11 plays a role in protecting the battery cell, the problem of thermal runaway of the battery is avoided, and the safety performance of the battery cell in short circuit is improved.
In addition, a low melting point metal film such as a lead-tin alloy film, an aluminum film, a magnesium-aluminum alloy film, an aluminum-silicon alloy film, a cadmium film, or the like may be provided on the surface of the first division 11. So set up, when taking place external short circuit, the metal film that the fusing point is low can melt fast, and after the metal film melted, can further promote the resistance of first subsection 11, accelerate the fusing speed of first subsection 11.
In some embodiments, the thickness of the first portion 11 on the same tab is smaller than the thickness of the second portion 12, or the thickness and width of the first portion 11 are smaller than the thickness and width of the second portion 12.
Specifically, the first tab 1 is provided with a first part 11 and a second part 12, or the second tab 2 is provided with the first part 11 and the second part 12, or the first tab 1 and the second tab 2 are provided with the first part 11 and the second part 12; the dimensions of the first portion 11 are smaller than those of other portions of the tab provided with the first portion 11, wherein the thickness of the first portion 11 is smaller than that of the second portion 12, the thickness and the width of the first portion 11 are smaller than those of the second portion 12, and the width of the first portion 11 is smaller than that of the second portion 12.
The fact that the size of the first section 11 is smaller than the size of the second section 12 means that the size of the overcurrent area of the first section 11 is smaller than the overcurrent area of the second section 12, and the cross-sectional size of the first section 11 is reduced under the condition that other conditions are unchanged, so that the internal resistance of the first section 11 can be increased, and the first section 11 can be gradually heated until reaching the melting point of the first section 11 to be fused when the battery is in an external short circuit.
It should be noted that, on the premise that the thickness of the first section 11 is smaller than the thickness of the second section 12, the width of the first section 11 is not limited, and the width of the first section 11 may be smaller than the width of the second section 12 or may be equal to the width of the second section 12, and the flow area of the first section 11 is smaller than the flow area of the second section 12 in the two arrangement modes; in addition, the width of the first section 11 may be larger than the width of the second section 12 on the premise described above, and it is also necessary to ensure that the cross-sectional dimension of the first section 11 is smaller than the cross-sectional dimension of the second section 12.
When the tab has a special-shaped structure, the area of the first section 11 should be smaller than the area of any part of the second section 12.
The battery cell with the structure comprises the first tab 1 and the second tab 2, wherein the first tab 1 and/or the second tab 2 are/is provided with the first branch 11 and the second branch 12, the thickness of the first branch 11 is smaller than that of the second branch 12, or the thickness and the width of the first branch 11 are smaller than those of the second branch 12. The resistance of the first subsection 11 can be increased, when the battery is in external short circuit, the current is large, and the resistance of the first subsection 11 is large, so that the first subsection 11 can rapidly heat up, is disconnected after reaching a melting point, and is cut off, the problem of thermal runaway of the battery is avoided, and the safety performance of the battery when the battery is in short circuit is improved.
In some preferred embodiments, the thickness and width of the first subsection 11 satisfy the formula:
wherein w is the width of the first portion 11, d is the thickness of the first portion 11, ρ is the conductivity of the first tab 1 or the second tab 2, V is the lower limit voltage of the battery cell, T is the fusing time, Δt is the temperature difference between the melting point temperature of the first tab 1 or the second tab 2 and the external short circuit, ρ is the density of the first tab 1 or the second tab 2, cp is the specific heat capacity of the first tab 1 or the second tab 2, and R is the internal resistance of the battery.
Specifically, the lower limit voltage of the battery refers to the lowest voltage that the battery can reach during normal discharge.
Here, the relation between the thickness and the width of the first subsection 11 and other parameters is given by the above formula, so that when the battery is short-circuited, the battery can be quickly and stably fused from the first subsection 11 of the tab, thereby avoiding the problem of thermal runaway of the battery and improving the safety performance during use.
In some embodiments, the battery cell comprises a tab glue 4 coated on the first tab 1 and the second tab 2, and the first tab 1 and the second tab 2 are bonded with the top edge seal through the tab glue 4; the first subsection 11 is at least partially provided with tab glue 4.
Specifically, the first pole piece and the second pole piece are wound to form a winding structure 5 or are overlapped to form a lamination structure, the aluminum plastic film 3 is used for being coated on the winding structure 5 or the lamination structure to form a shell for coating the first pole piece and the second pole piece, a top sealing edge is formed at the sealing edge position of the aluminum plastic film 3, the top sealing edge is used for enabling the first pole lug 1 and the second pole lug 2 to penetrate out, and the pole lug glue 4 is coated on the outer sides of the local part of the first pole lug 1 and the local part of the second pole lug 2, so that the bonding seal between the pole lug and the aluminum plastic film 3 is realized, and the position of the pole lug glue 4 is required to be coated at the position of the close adjacent top sealing edge. At least part of the first subsection 11 is coated with the tab adhesive 4, including both a part of the first subsection 11 being coated with the tab adhesive 4 and all of the first subsection 11 being coated with the tab adhesive 4.
It should be noted that, the first part 11 may be located at the inner side of the housing or may be located at the outer side of the housing, which only needs to ensure that the first part 11 is at least partially coated with the tab adhesive 4.
Here, when the short circuit of electric core takes place the short circuit, the resistance of first branch 11 increases, and the temperature risees, owing to be provided with utmost point ear glue 4 in first branch 11 at least locally, utmost point ear glue 4 is the hot melt adhesive again, and utmost point ear glue 4 can be heated and take place to melt, and the temperature further rises, and first branch 11 can take place to fuse, and utmost point ear glue 4 melts, will form the pressure release mouth to make gaseous follow the discharge of pressure release mouth, so set up and can avoid the electric core to take place the explosion because the high temperature leads to in the electric core.
In some embodiments, the battery cell comprises a tab glue 4 coated on the first tab 1 and the second tab 2, and the first tab 1 and the second tab 2 are bonded with the top edge seal through the tab glue 4; the first subsection 11 is located inside the housing.
Specifically, the first pole piece and the second pole piece are wound to form a winding structure 5 or stacked to form a lamination structure, and the aluminum plastic film 3 is used for being coated on the winding structure 5 or the lamination structure to form a shell for coating the first pole piece and the second pole piece. Here, the first part 11 is disposed inside the casing, and the first part 11 is not coated with the tab adhesive 4, when the short circuit occurs in the battery core, the resistance of the first part 11 increases, the temperature increases, and the first part 11 may be fused along with the temperature increase, so that the short circuit between the first tab 1 and the second tab 2 becomes open circuit, and the effect of protecting the battery core can be also achieved.
When the first portion 11 is located inside the housing, the first portion may be coated with the tab adhesive 4 or may not be coated with the tab adhesive 4. When the first branch 11 is coated with the tab glue, the pressure relief opening in the embodiment can be formed when a short circuit occurs, and the first branch 11 is positioned on the inner side of the shell, so that the first tab 1 and the second tab 2 can not be broken off from the first branch position when the battery cell is normally used, and the first branch 11 can be protected when the battery cell normally works.
In some embodiments, the battery cell comprises a tab glue 4 coated on the first tab 1 and the second tab 2, and the first tab 1 and the second tab 2 are bonded with the top edge seal through the tab glue 4; the first subsection 11 is located outside the housing.
Specifically, the first pole piece and the second pole piece are wound to form a winding structure 5 or stacked to form a lamination structure, and the aluminum plastic film 3 is used for being coated on the winding structure 5 or the lamination structure to form a shell for coating the first pole piece and the second pole piece. Because the size of the first part 11 is smaller than that of the second part 12, when the first part 11 is arranged outside the shell, the first part 11 may be broken in the normal use process of the battery cell without short circuit, but the first part 11 may be fused when the battery cell is short-circuited, and the function of protecting the battery cell can be achieved.
In some embodiments, the width of the first subsection 11 is greater than or equal to 1mm.
Specifically, when the cross-sectional area of the first section 11 is reduced by reducing the width of the first section 11, in order to avoid the first section 11 from being broken when the tab provided with the first section 11 is mounted, the width of the first section 11 cannot be excessively small, and the width of the first section 11 is 1mm or more, so that the stability when the tab provided with the first section 11 is mounted can be ensured.
In some embodiments, the thickness of the first subsection 11 is greater than or equal to 0.08mm.
In the same way, when the cross-sectional area of the first section 11 is reduced by reducing the thickness of the protection, in order to avoid the first section 11 from being broken when the tab provided with the first section 11 is mounted, the thickness of the first section 11 cannot be excessively small, and here, the thickness of the first section 11 is 0.08mm or more, so that the stability when the tab provided with the first section 11 is mounted can be ensured.
In some embodiments, the height of the first subsection 11 is greater than or equal to 2mm.
Specifically, the height of the first subsection 11 is the height shown by h in fig. 2 and 5, when the positive and negative poles of the battery are shorted, the short circuit current is very large, the resistance of the position of the first subsection 11 is large, the temperature of the position of the first subsection 11 is raised, the first subsection 11 is further fused, the premise that the first subsection 11 is fused by heating is that a certain height of the first subsection 11 is required to be ensured, and the height of h is more than or equal to 2mm so that the first subsection 11 can be completely fused when the temperature of the first subsection 11 is raised.
Furthermore, when the first part 11 penetrates through the lug hole, and the two ends of the first part 11 extend out of the lug hole, the h is further guaranteed to be smaller than or equal to the hg of the height of the lug adhesive 4, the whole coverage of the lug adhesive 4 to the first part 11 can be achieved through the arrangement, and when the temperature of the first part 11 is raised, the lug adhesive 4 is enabled to be heated and melted, and a pressure relief opening for discharging gas in the battery is formed.
In some embodiments, the height of the first subsection 11 is less than 1/5 of the height of the tab provided with the first subsection 11.
Specifically, the height of the tab is the height shown in ht in fig. 2 and 5, and the height of the first portion 11 cannot be too large, and since the width and/or thickness of the first portion 11 is smaller than the width or thickness of the rest of the tab provided with the first portion 11, the stability of the tab structure can be ensured when the tab provided with the first portion 11 is installed and used by making the height of the first portion 11 smaller than 1/5 of the tab provided with the first portion 11.
In some embodiments, the first subsection 11 is disposed over the positive tab.
Specifically, aluminum or an aluminum alloy is generally used as a material of the positive electrode tab, and nickel, copper or an alloy thereof is generally used as a material of the negative electrode tab. Since the melting point of aluminum is 660 ℃, the melting point of nickel is 1453 ℃, and the melting point of copper is 1083.4 ℃. Because the melting point of the aluminum material used for the positive electrode lug is low, the first part 11 is arranged on the positive electrode lug, and compared with the scheme of arranging the first part 11 on the negative electrode lug, the first part 11 can be fused when reaching relatively low temperature, so that the effect of cutting off a passage is realized.
In addition, first branch 11 still can set up on the negative pole ear, can all set up again on anodal ear and negative pole ear, all set up first branch 11 on anodal ear and negative pole ear, when the battery positive negative pole short circuit took place the short circuit, short circuit current is very big, and the resistance in first branch 11 position is big then can lead to first branch 11 position temperature to rise, all sets up first branch 11 at anodal ear and negative pole ear, can be when the first branch 11 on one of them utmost point ear is not fused because of unexpected heating, the first branch 11 on another utmost point ear is heated the fusing to guarantee that the passageway can be cut off, so set up can play dual protection's effect.
In some embodiments, the base battery information is as follows, the positive electrode material is lithium cobaltate, according to the following: conductive carbon black: carbon nanotubes: polyvinylidene fluoride=96.9:1.1:0.9:1.1 to obtain positive electrode slurry, wherein the negative electrode active material is graphite, and the graphite is used as follows: conductive carbon black: styrene butadiene rubber carboxymethyl cellulose = 96: mixing the anode slurry in a ratio of 2:1.4:0.6 to obtain anode slurry, coating and rolling the anode slurry to obtain anode plates with a width of 586mm and a thickness of 91 mu m and a surface density of 30.7mg/cm < 2 >, coating and rolling the anode slurry to obtain anode plates with a width of 594mm and a thickness of 111 mu m and a surface density of 17mg/cm < 2 >, winding the anode plates with positive and negative poles to obtain a required battery core, using a normal anode lug in a base group and using an anode lug with an out-of-band short circuit protection structure shown in FIG. 2 in a comparison group to obtain a base group and a comparison battery core, firstly filling the battery with a constant current and a constant voltage at 1C, keeping a cut-off voltage at 4.45V and keeping the cut-off current at 0.05C, and then carrying out an external short circuit test. (2) the short-circuit time reaches 24 hours; (3) thermal runaway of battery ignition. The battery information and test results are shown in table 1.
Table 1: battery information and test results
As shown in table 1, the base group positive tabs had no external short-circuit protection structure, and the comparative group positive tabs had external short-circuit protection structures, but the external short-circuit protection structures were different in size. Wherein, the thermal runaway occurs in the base battery, the voltage drop of the base battery is 0V because the battery is in thermal runaway, the thermal runaway does not occur in the comparison battery, the voltage drop of the base battery is 0V because the external short-circuit protection structure is fused, and the passage is cut off. Through experimental structure, the outer short-circuit protection structure of anodal ear can in time cut off the passageway when outer short circuit takes place, avoids the battery to take place thermal runaway, guarantees the security of battery.
A battery comprises the battery cell. The beneficial effects of the battery pack brought by the battery core are shown in the above description, and are not repeated here.
The basic principles of the present utility model have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present utility model are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be considered as essential to the various embodiments of the present utility model. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the utility model is not necessarily limited to practice with the above described specific details.
The block diagrams of the devices, apparatuses, devices, systems referred to in the present utility model are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
It is also noted that in the apparatus, devices and methods of the present utility model, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present utility model.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the utility model. Thus, the present utility model is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It should be understood that the terms "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present utility model are used for more clearly describing the technical solutions, and are not intended to limit the scope of the present utility model.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the utility model to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (11)
1. A cell, comprising:
the first tab is connected with the first pole piece;
the second lug is connected with the second pole piece;
the aluminum plastic film is used for forming a shell for coating the first pole piece and the second pole piece, and is provided with a top edge sealing for penetrating out the first pole lug and the second pole lug;
the first tab and/or the second tab are/is provided with a first part and a second part, and the overcurrent area of the first part on the same tab is smaller than that of the second part.
2. The cell of claim 1, wherein the thickness of the first portion is smaller than the thickness of the second portion or the thickness and width of the first portion are smaller than the thickness and width of the second portion on the same tab.
3. The cell of claim 2, wherein the thickness and width of the first subsection satisfy the formula:
wherein w is the width of the first subsection, d is the thickness of the first subsection, ρ Electric power And V is the lower limit voltage of the battery cell, T is the fusing time, deltaT is the temperature difference between the melting point temperature of the first tab or the second tab and the external short circuit, ρ is the density of the first tab or the second tab, cp is the specific heat capacity of the first tab or the second tab, and R is the internal resistance of the battery.
4. The cell of claim 1, wherein the cell comprises a tab glue coated on the first tab and the second tab, the first tab and the second tab being bonded to the top seal by the tab glue; the first subsection is at least partially provided with the tab glue.
5. The cell of claim 1 or 4, wherein the cell comprises a tab glue coated on the first tab and the second tab, the first tab and the second tab being bonded to the top seal by the tab glue; the first subsection is located inside the housing.
6. The cell of claim 1, wherein the cell comprises a tab glue coated on the first tab and the second tab, the first tab and the second tab being bonded to the top seal by the tab glue; the first subsection is located outside the housing.
7. The cell of claim 2, wherein the width of the first section is 1mm or more.
8. The cell of claim 2, wherein the thickness of the first subsection is 0.08mm or greater.
9. The cell of claim 1, wherein the height of the first section is 2mm or more and less than 1/5 of the tab height at which the first section is disposed.
10. The cell of claim 1, wherein the first subsection is disposed on the positive tab.
11. A battery comprising a cell according to any one of claims 1-10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321683495.3U CN220106842U (en) | 2023-06-29 | 2023-06-29 | Battery cell and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321683495.3U CN220106842U (en) | 2023-06-29 | 2023-06-29 | Battery cell and battery |
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| CN220106842U true CN220106842U (en) | 2023-11-28 |
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| CN202321683495.3U Active CN220106842U (en) | 2023-06-29 | 2023-06-29 | Battery cell and battery |
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| CN (1) | CN220106842U (en) |
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