CN111697169B - Lithium battery and seal head - Google Patents
Lithium battery and seal head Download PDFInfo
- Publication number
- CN111697169B CN111697169B CN202010554371.XA CN202010554371A CN111697169B CN 111697169 B CN111697169 B CN 111697169B CN 202010554371 A CN202010554371 A CN 202010554371A CN 111697169 B CN111697169 B CN 111697169B
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- China
- Prior art keywords
- battery
- seal
- lithium battery
- guard
- thickness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 39
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 230000001681 protective effect Effects 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 description 12
- 238000007789 sealing Methods 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 7
- 239000002985 plastic film Substances 0.000 description 7
- 229920006255 plastic film Polymers 0.000 description 7
- 238000004880 explosion Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 241000238367 Mya arenaria Species 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 150000002641 lithium Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a lithium battery and an end socket, wherein the lithium battery comprises a battery cell, a tab arranged at the end part of the battery cell and a seal arranged outside the battery cell; the seal comprises a protection part, and before thermal runaway of the battery, the protection part is broken earlier than other parts except the protection part on the seal, so that pressure relief is realized. The invention also discloses an end socket, which comprises at least two hot-pressing surfaces with different heights, so that at least two inconsistent thickness positions are formed on the protection part. The invention provides a lithium battery which can break a battery seal to release pressure before thermal runaway of the battery occurs.
Description
Technical Field
The invention relates to the technical field of lithium battery manufacturing, in particular to a lithium battery and a sealing head.
Background
The lithium battery is widely applied in the field of electrochemical energy storage by virtue of the advantages of high energy density, long service life, no memory effect, cleanness, high efficiency and the like, and particularly widely applied to an electric automobile, and the application of the lithium battery to the electric automobile has higher requirements on the safety performance of the lithium battery. In contrast to hard-shell packaged batteries such as steel and aluminum, soft-shell batteries do not have some safety protection devices in the battery, which are similar to those of hard-shell packaged batteries, so that the safety performance of soft-shell lithium batteries is improved from the design of electrochemical systems to ensure the safety of soft-shell lithium batteries.
In the use process of the lithium battery, the lithium battery may have thermal runaway due to the characteristics of the external environment such as the variability, self-heating, high voltage and the like, and if the soft package lithium battery does not break the seal of the battery before the thermal runaway, safety accidents such as explosion and the like may occur. The soft package lithium battery in the present stage can appear the phenomenon that the seal is difficult to break before the thermal runaway to lead to the soft package lithium battery to have the problem of potential safety hazard.
Disclosure of Invention
The invention aims to provide a lithium battery and an end socket, which are used for solving the problem that the soft package lithium battery provided in the background art is difficult to break the seal before thermal runaway, so that potential safety hazards exist in the soft package lithium battery.
To achieve the purpose, the invention adopts the following technical scheme:
the lithium battery comprises a battery cell, a tab arranged at the end part of the battery cell and a seal arranged outside the battery cell; the seal comprises a protection part, and before thermal runaway of the battery, the protection part is broken earlier than other parts except the protection part on the seal, so that pressure relief is realized.
In an alternative embodiment of the invention, the thickness of at least two areas of the guard are not uniform, so that the seal can be broken from the area of greater thickness of the guard before thermal runaway of the battery.
In an alternative embodiment of the invention, the guard is located at the tab.
In an alternative embodiment of the invention, the thickness of the guard portion decreases from the middle to the sides.
In an alternative embodiment of the invention, the thickness of the guard portion is tapered by 8% -25%.
In an alternative embodiment of the present invention, two sides of the protection part are symmetrically arranged.
In an alternative embodiment of the present invention, both sides of the guard portion are asymmetrically disposed.
In an alternative embodiment of the invention, the guard is located on a side of the cell.
In an alternative embodiment of the present invention, the guard portion is disposed corresponding to an exhaust passage of the battery.
The invention also provides a sealing head applied to the lithium battery, and the sealing head comprises at least two hot-pressing surfaces with different heights so as to form at least two inconsistent thickness positions on the protection part.
The invention has the advantages that: the protective part is arranged on the seal of the battery, and the other parts except the protective part are firstly punched on the protective part before the thermal runaway of the battery, so that the pressure relief is realized, the safety accidents such as explosion and the like of the battery are prevented, and the safety performance of the battery is improved.
Drawings
Fig. 1 is a schematic cross-sectional structure of a lithium battery according to an embodiment of the present invention;
fig. 2 is a schematic view showing an exploded structure of a lithium battery according to an embodiment of the present invention;
fig. 3 is a schematic view of a manufacturing process of a lithium battery according to an embodiment of the present invention;
FIG. 4 is a schematic view of a first embodiment of a guard portion according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a seal head according to an embodiment of the present invention;
FIG. 6 is a schematic view of a seal head in a state of pressing a protecting portion according to an embodiment of the present invention;
FIG. 7 is a schematic view of a second embodiment of a guard portion according to an embodiment of the present invention;
FIG. 8 is a schematic view of a third embodiment of a guard portion according to an embodiment of the present invention;
FIG. 9 is a schematic view of a fourth embodiment of a guard portion according to an embodiment of the present invention;
fig. 10 is a schematic structural view of a fifth embodiment of a guard portion according to an embodiment of the present invention.
In the figure:
10. a battery cell; 20. a tab; 30. sealing; 40. an aluminum plastic film; 50. a seal head;
31. a protective part.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present embodiment, the terms "upper", "lower", "front", "rear", "left", "rear", and the like are orientation or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, the lithium battery includes a battery cell 10, a tab 20 and a seal 30, the tab 20 is disposed at an end of the battery cell 10, and generally the tab 20 has a positive tab and a negative tab, as shown in fig. 1, which are disposed at two ends of the battery cell 10. The seal 30 is disposed outside the cell 10. The seal 30 is formed by: referring to fig. 2 and 3, after the two plastic-aluminum films 40 cover the battery cell 10, the battery cell 10 is sandwiched between the two plastic-aluminum films 40, and hot pressing is performed at the overlapping position of the edges of the two plastic-aluminum films 40 to form the seal 30, so that the battery cell 10 is sealed in the plastic-aluminum films 40; the two aluminum plastic films 40 are only shown in fig. 3 to be overlapped and placed together, and hot pressing is not performed, so that the two aluminum plastic films 40 are still separated, after the hot pressing is completed, the peripheries of the two aluminum plastic films 40 are adhered together, and the battery cell 10 is sealed in the battery cell.
The seal 30 includes the guard 31, before battery thermal runaway, the guard 31 is broken earlier than the rest of the seal 30 except guard 31, for the battery pressure release, prevents danger such as explosion, has promoted the safety protection performance of battery.
The protecting portion 31 is a portion with a small thickness difference on the seal 30, please refer to fig. 4, at least two portions of the protecting portion 31 have different thicknesses, so that the seal 30 can be broken from a portion with a larger thickness on the protecting portion 31 before the battery is out of control, the pressure of the battery is relieved, the explosion and other risks are prevented, and the safety protection performance of the battery is improved. The thickness difference can be specifically realized by the seal head 50, and as shown in fig. 6, the seal head 50 presses the edges of the aluminum plastic films 40 during hot pressing, and the edges of the two aluminum plastic films 40 are hot pressed together to form the seal 30 under hot pressing for a certain time at a certain temperature. In order to form the protective part 31 with thickness difference on the seal 30, as shown in fig. 5 and 6, the seal head 50 adopted by the invention comprises at least two hot-pressing surfaces with different heights, and after the hot-pressing surfaces with different heights are contacted with the aluminum plastic film 40 and pressed down, the seal edge with inconsistent thickness can be formed on the protective part 31, namely the seal 30. It will be appreciated that where the seal 30 is otherwise not required to have the guard 31, and where it is not required to have the thickness differential, the heat exchanging platen may be a flat other head to perform the hot pressing. The greater thickness of the guard 31 indicates less compression and is easier to break, so the seal 30 is broken from the greater thickness before thermal runaway of the battery, while the lesser thickness indicates less compression and is less easy to break.
The invention can directly utilize the seal head 50 used in hot pressing to form the protective part 31 on the seal 30, has simple forming, does not need to use any other tool or change the forming process to set the protective part 31 on the seal 30, can promote the safety protection performance of the battery without increasing higher cost, realizes bursting the seal 30 before the thermal runaway of the battery, and prevents safety accidents. In addition, the protection part 31 can be formed only by changing the seal head 50, which is beneficial to automatic production.
The lithium battery is suitable for any lithium battery with seal, and is especially suitable for soft package lithium batteries.
The protection part 31 is used for breaking the seal 30 from a larger thickness before thermal runaway of the battery, so that the danger of explosion and the like of the battery is avoided, the protection part 31 can be arranged at any position on the battery, for example, the protection part 31 can be positioned at the tab 20, the temperature at the tab 20 is higher than the temperature at the surface of the battery cell 10, the seal 30 of the battery is generally unsealed at the tab 20, and the protection part 31 is arranged at the tab 20, so that the battery can be facilitated to break the seal 30. Specifically, the protecting portion 31 may be disposed at the positive electrode ear or the negative electrode ear, which is not limited herein, and the temperatures at the positive and negative electrode ears are relatively high, so that the protecting portion 31 is preferably disposed.
Of course, the protection portion 31 may be located at a side portion of the battery cell 10, for example, the protection portion 31 may be disposed at any position around the battery cell 10.
The guard 31 may be provided corresponding to the exhaust passage of the battery. Generally, an exhaust channel is disposed in the battery for exhausting the gas in the battery, and the protecting portion 31 is disposed corresponding to the exhaust channel, so that the seal 30 can be broken by utilizing the gas exhausted from the exhaust channel of the battery, which is more beneficial to improving the safety performance of the battery.
Fig. 4 is a schematic structural view of a first embodiment of the guard portion according to the embodiment of the present invention, and as shown in fig. 4, the thickness of the guard portion 31 decreases from the middle to the two sides, so as to form a thickness difference. The protecting portion 31 shown in fig. 4 has a plurality of places with different thicknesses, and in practical implementation, it is only necessary to ensure that at least two places have different thicknesses, that is, the protecting portion 31 has a position with a larger thickness, so that the battery can break the seal 30 preferentially from the position with the larger thickness. In the embodiment shown in fig. 7, it is shown that there are only two non-uniform thicknesses on the guard 31.
It will be appreciated that the thickness of the guard 31 may also vary continuously, rather than being tapered, as shown in figure 8.
In addition, as shown in fig. 4, when the thickness of the guard portion 31 decreases to both sides, the decreasing gradient is 8% -25%, that is, the decreasing thickness is reduced by 8% -25% on the basis of the original thickness every time, so that the decreasing degree of each time is not great, and the overall strength of the guard portion 31 can be ensured.
With continued reference to fig. 4, the two sides of the protecting portion 31 are symmetrically disposed, and the thickness decreases from the middle to the two sides in a symmetrical manner. The symmetrical arrangement of the protecting part 31 not only ensures that the protecting part 31 is stressed symmetrically, but also is beneficial to the arrangement of the sealing head 50, so that the hot pressing surface on the sealing head 50 is symmetrical, and the sealing head 50 is beneficial to manufacturing.
As shown in fig. 4, the thickness of the guard portion 31 decreases by 10% and 23% in order from the middle to the both sides. Let the thickness of the middle of the guard 31 be a, the thickness of the adjacent middle be b, and the thickness of the two sides be c, b=0.9a; c=0.77 b, b is reduced by 10% on a basis and c is reduced by 23% on b basis.
As shown in fig. 9, the two sides of the guard 31 may be provided asymmetrically, and may have a thickness difference.
The thickness of the guard 31 is not necessarily decreased or increased, but may be increased or decreased irregularly, as shown in fig. 10, and the thickness of the guard 31 is decreased from left to right, then increased, and then decreased again, as shown in fig. 10.
The invention also provides a sealing head applied to the lithium battery, the structure of the sealing head 50 is shown in fig. 5, and the sealing head comprises at least two hot-pressing surfaces with different heights, so that at least two inconsistent thickness positions are formed on the protecting part 31, the protecting part 31 is provided with thicker thickness positions, the lithium battery can break the sealing seal 30 from the thicker thickness positions on the protecting part 31 before thermal runaway, the pressure of the battery is relieved, and the safety performance of the battery is ensured.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. The lithium battery is characterized by comprising a battery cell (10), a tab (20) arranged at the end part of the battery cell (10), and a seal (30) arranged outside the battery cell (10); the seal (30) comprises a protection part (31), and before the battery is out of control, the protection part (31) is broken before other parts except the protection part (31) on the seal (30) so as to realize pressure relief;
at least two parts of the protective part (31) are inconsistent in thickness, so that the seal (30) can be broken from the part with larger thickness on the protective part (31) before the battery is in thermal runaway;
the thickness change of the protection part (31) is gradient change, and the gradient of the thickness decrease of the protection part (31) is 8% -25%.
2. The lithium battery according to claim 1, characterized in that the guard (31) is located at the tab (20).
3. Lithium battery according to claim 2, characterized in that the thickness of the guard (31) decreases from the middle to the sides.
4. A lithium battery according to claim 3, characterized in that the sides of the guard (31) are symmetrically arranged.
5. A lithium battery according to claim 3, characterized in that the sides of the guard (31) are asymmetrically arranged.
6. Lithium battery according to claim 1, characterized in that the guard (31) is located at the side of the cell (10).
7. The lithium battery according to claim 1, characterized in that the guard (31) is provided in correspondence with an exhaust channel of the battery.
8. A closure for a lithium battery according to any one of claims 1-7, characterized in that the closure comprises at least two hot-pressed surfaces of different heights to form at least two non-uniform thickness areas on the protective portion (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010554371.XA CN111697169B (en) | 2020-06-17 | 2020-06-17 | Lithium battery and seal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010554371.XA CN111697169B (en) | 2020-06-17 | 2020-06-17 | Lithium battery and seal head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111697169A CN111697169A (en) | 2020-09-22 |
| CN111697169B true CN111697169B (en) | 2023-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010554371.XA Active CN111697169B (en) | 2020-06-17 | 2020-06-17 | Lithium battery and seal head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111697169B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005332726A (en) * | 2004-05-21 | 2005-12-02 | Toyota Motor Corp | Laminated battery |
| JP2017037753A (en) * | 2015-08-07 | 2017-02-16 | 株式会社デンソー | Battery pack |
| CN108281577A (en) * | 2018-02-28 | 2018-07-13 | 河南国能电池有限公司 | Soft-package battery closedtop end socket |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007265738A (en) * | 2006-03-28 | 2007-10-11 | Dainippon Printing Co Ltd | Battery equipped with liquid leak detecting function |
| CN102130313A (en) * | 2010-01-12 | 2011-07-20 | 比克国际(天津)有限公司 | Soft packaging battery and battery pack |
| CN205069689U (en) * | 2015-09-21 | 2016-03-02 | 东莞市爱思普能源科技有限公司 | A grooved head |
| CN205376660U (en) * | 2016-01-22 | 2016-07-06 | 东莞市卓越新材料科技有限公司 | Lithium cell is head for banding and lithium cell that encapsulation obtained thereof |
| CN205406573U (en) * | 2016-03-02 | 2016-07-27 | 宁德时代新能源科技股份有限公司 | Soft packet of secondary cell casing |
| CN205900670U (en) * | 2016-08-08 | 2017-01-18 | 上海贯裕能源科技有限公司 | Laminate polymer battery safety exhaust packaging hardware |
| CN106299182B (en) * | 2016-08-20 | 2020-03-27 | 浙江超威创元实业有限公司 | Soft package lithium ion battery with positioning explosion-proof function and manufacturing method thereof |
| CN208723027U (en) * | 2018-09-07 | 2019-04-09 | 微宏动力系统（湖州）有限公司 | The battery that a kind of battery edge sealing end socket and its encapsulation obtain |
-
2020
- 2020-06-17 CN CN202010554371.XA patent/CN111697169B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005332726A (en) * | 2004-05-21 | 2005-12-02 | Toyota Motor Corp | Laminated battery |
| JP2017037753A (en) * | 2015-08-07 | 2017-02-16 | 株式会社デンソー | Battery pack |
| CN108281577A (en) * | 2018-02-28 | 2018-07-13 | 河南国能电池有限公司 | Soft-package battery closedtop end socket |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111697169A (en) | 2020-09-22 |
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