CN211578795U - Battery end cover with safety protection function - Google Patents
Battery end cover with safety protection function Download PDFInfo
- Publication number
- CN211578795U CN211578795U CN202020423919.2U CN202020423919U CN211578795U CN 211578795 U CN211578795 U CN 211578795U CN 202020423919 U CN202020423919 U CN 202020423919U CN 211578795 U CN211578795 U CN 211578795U
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- Prior art keywords
- explosion
- welding
- face
- mounting hole
- diaphragm
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- 239000012528 membrane Substances 0.000 claims abstract description 42
- 239000011148 porous material Substances 0.000 claims abstract description 24
- 238000003466 welding Methods 0.000 claims description 60
- 229910000679 solder Inorganic materials 0.000 claims description 5
- 238000004880 explosion Methods 0.000 claims 5
- 238000010030 laminating Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model provides a battery end cover with safety protection function, which comprises an upper cover, a pore plate frame, an explosion-proof membrane and a power-off membrane, wherein a pore plate is fixedly arranged on the pore plate frame, and the upper end surface of the pore plate is provided with a first mounting hole; the lower end face of the pore plate is provided with a second mounting hole, the upper end face of the pore plate is provided with a first boss protruding upwards, the edge of the explosion-proof membrane is fixedly mounted on the upper cover, the lower end face of the explosion-proof membrane and the first boss are welded and attached, the middle part of the lower end of the explosion-proof membrane is provided with a positioning boss protruding downwards, and the positioning boss is mounted in the first mounting hole; the power-off diaphragm is installed in the second installation hole, and the upper end face of the power-off diaphragm and the lower end face of the positioning boss are welded and attached to each other. The end cover structure ensures the electrifying area of the end cover, reduces the joule heat generated by the resistance value of the circuit and reduces the risk of thermal runaway.
Description
Technical Field
The utility model relates to a battery manufacturing field especially relates to a battery end cover with safety protection function.
Background
The cell end cap is an important component of the cell, and has the following functions:
(1) and connecting the pole group with an external circuit to enable current to be input and output. This current should be the maximum current allowed by the battery.
(2) The end cover is assembled with the shell through welding or crimping compression to form sealing, and normal work of the pole group is guaranteed.
(3) The safety protection function of the battery is required, and comprises the following steps:
a. open function (CID): this function is to open the circuit when the internal pressure of the cell rises to a certain value due to a failure. And stopping the cell.
b. Membrane opening function (Vent): the function is that if the internal pressure of the battery continues to rise to a certain value after the battery is disconnected, the diaphragm should be opened to release air, so as to prevent the battery from exploding.
(4) In the environment of 20-25 ℃, the temperature rise of the end cover cannot exceed 80 ℃ when the end cover passes 300A current for 5 minutes.
(5) The resistance value of the end cover should be less than or equal to 1m omega in the whole life cycle of the battery cell
The temperature of the end cover passing 300A current does not exceed 80 ℃, and the essence is that the energizing area of each node on the internal circuit of the battery is required to be more than 40mm2Particularly, the energizing area of the pore plate and the diaphragm on the end cover is equal to or larger than 40mm2The pull force of the conventional cell's trip function end cap only allows a total of 2.8mm of snap2Welding area of 44mm apart2The difference of the power-on areas is large, and the small welding area can cause the rapid temperature rise in the power-on process, thereby damaging the battery. Meanwhile, the traditional diaphragm wraps the upper cover through the turned edge, so that contact resistance is generated, and the resistance is large and unstable due to cold and hot impact, oxidation and the like.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is that the pulling force of the function end cover that opens circuit of traditional battery only allows to snap 2.8mm in total2Welding area of 44mm apart2The difference of the power-on areas is large, and the small welding area can cause the rapid temperature rise in the power-on process, thereby damaging the battery. Meanwhile, the traditional diaphragm wraps the upper cover through the turned edge to generate contact resistance and cause large and unstable resistance due to cold and hot impact, oxidation and the like, and the utility model provides a battery end cover with a safety protection function.
The utility model provides a technical scheme that its technical problem adopted is: a battery end cover with a safety protection function comprises an upper cover, a pore plate frame, an explosion-proof membrane and a power-off membrane, wherein the pore plate frame is arranged below the upper cover; the lower end face of the pore plate is provided with a second mounting hole, the first mounting hole is communicated with the second mounting hole, the upper end face of the pore plate is provided with a first boss protruding upwards on the outer side of the first mounting hole, the explosion-proof membrane is mounted between the upper cover and the pore plate frame, the edge of the explosion-proof membrane is fixedly mounted on the upper cover, the explosion-proof membrane gradually protrudes downwards from outside to inside, the lower end face of the explosion-proof membrane and the first boss are welded and attached to each other, the middle of the lower end of the explosion-proof membrane is provided with a positioning boss protruding downwards, and the positioning boss is mounted in the first mounting hole; the power-off diaphragm is installed in the second installation hole, and the upper end face of the power-off diaphragm and the lower end face of the positioning boss are welded and attached to each other.
Further: 16 welding spots are uniformly welded on the binding surface of the explosion-proof membrane and the first boss, and the diameter of each welding spot is 0.4 mm.
Further: the 16 welding spots comprise 8 first welding spots and 8 second welding spots, the first welding spots and the second welding spots are arranged at intervals, and the first welding spots are uniformly distributed by taking phi 7 as a circumference; the second welding points are uniformly distributed by taking phi 7.5 as a circumference.
Further: the binding face of the power-off membrane and the positioning boss is uniformly welded with 4 third welding spots, and the diameter of each third welding spot is 0.4 mm.
Further: the edge of the explosion-proof membrane is wrapped on the upper end face of the upper cover, three sections of arc-shaped welding seams are formed by laser welding of the explosion-proof membrane and the upper end face of the upper cover, and the three sections of arc-shaped welding seams are uniformly distributed along the circumferential direction.
Further: the width of the arc-shaped welding line is 1 mm; the length of the circular arc welding seam 11 is 20 mm.
The beneficial effects of the utility model are that, the utility model relates to a battery end cover with safety protection function has guaranteed the circular telegram area of end cover, has reduced the joule heat that the circuit resistance produced, makes the entropy of battery increase and reduces, has improved active material's decomposition temperature, has reduced the risk of thermal runaway. Meanwhile, the internal pressure of the battery at the initial stage of the failure can be ensured to rise to a certain value, and the circuit is disconnected when the temperature in the battery does not reach the decomposition temperature of the material, so that electrons and ions in the pole set stop moving, and the temperature in the battery does not rise any more.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a battery end cap with a safety protection function according to the present invention;
FIG. 2 is a schematic diagram of the construction of an orifice plate;
FIG. 3 is a schematic structural diagram of an explosion-proof membrane and an orifice plate;
FIG. 4 is a schematic illustration of a first solder joint and a second solder joint;
FIG. 5 is a schematic view of a third solder joint;
FIG. 6 is a schematic view of a circular arc shaped weld.
In the figure, 1, an upper cover, 2, a hole plate frame, 20, a hole plate, 21, a first boss, 3, an explosion-proof membrane, 4, a power-off membrane, 5, a first mounting hole, 6, a second mounting hole, 7, a positioning boss, 8, a first welding point, 9, a second welding point, 10, a third welding point, 11 and a circular arc-shaped welding line are arranged.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used only for convenience in describing and simplifying the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present invention includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
As shown in fig. 1, 2 and 3, the utility model provides a battery end cover with safety protection function, which comprises an upper cover 1, a pore plate frame 2 arranged below the upper cover 1, an explosion-proof membrane 3 and a power-off membrane 4, wherein a pore plate 20 is fixedly arranged on the pore plate frame 2, and the upper end surface of the pore plate 20 is provided with a first mounting hole 5; the lower end face of the pore plate 20 is provided with a second mounting hole 6, the first mounting hole 5 is communicated with the second mounting hole 6, the upper end face of the pore plate 20 is provided with a first boss 21 protruding upwards on the outer side of the first mounting hole 5, the explosion-proof membrane 3 is installed between the upper cover 1 and the pore plate frame 2, the edge of the explosion-proof membrane 3 is fixedly installed on the upper cover 1, the explosion-proof membrane 3 gradually protrudes downwards from outside to inside, the lower end face of the explosion-proof membrane 3 is welded and attached to the first boss 21, a positioning boss 7 protruding downwards is arranged in the middle of the lower end of the explosion-proof membrane 3, and the positioning boss 7 is installed in the first mounting hole 5; the power-off membrane 4 is arranged in the second mounting hole 6, and the upper end face of the power-off membrane 4 is welded and attached to the lower end face of the positioning boss 7.
The safety protection function of the end cover is realized by that the lower convex part of the explosion-proof membrane 3 is pushed by the internal pressure of the battery, and then the lower convex part is unstably overturned and pulled to be in contact with the pore plate 20 to form an open circuit. The internal pressure of the battery at the initial stage of the failure can be ensured to rise to a certain value, and the circuit is disconnected when the temperature in the battery does not reach the decomposition temperature of the material, so that electrons and ions in the electrode group stop moving, the temperature in the battery does not rise any more, and the occurrence of thermal runaway is prevented. The end cover structure can reduce heat generation of the battery and reduce the risk of thermal runaway, and is an effective way for improving the safety of the battery.
Referring to fig. 4 and 5, 16 welding spots are uniformly welded on the joint surface of the explosion-proof membrane 3 and the first boss 21, and the diameter of each welding spot is 0.4 mm. The 16 welding spots comprise 8 first welding spots 8 and 8 second welding spots 9, the first welding spots 8 and the second welding spots 9 are arranged at intervals, and the first welding spots 8 are uniformly distributed with phi 7 as a circumference; the second welding points 9 are uniformly distributed by taking phi 7.5 as a circumference. The binding face of the power-off membrane 4 and the positioning boss 7 is uniformly welded with 4 third welding spots 10, and the diameter of each third welding spot 10 is 0.4 mm.
The temperature of the end cover passing through 300A current does not exceed 80 ℃, which is the fact that the energizing area of each node on the internal circuit of the battery is required to be larger than 40mm2, specifically, the energizing area of the pore plate 20 and the membrane is equal to or larger than 2 of 40mm, the energizing area of the membrane and the pore plate 20 can reach 2 of 40mm through the process of 16 welding spots, and simultaneously, when the internal pressure of the battery is 1MPa, 20 welding spots are cut off by turning and pulling so as to form the circuit breaking requirement. Through the area of guaranteeing the circular telegram of end cover, reduced the joule heat that the circuit resistance produced, made the entropy increase of battery reduce, improved active material's decomposition temperature, reduced the thermal runaway risk.
Referring to fig. 6, the edge of the explosion-proof membrane 3 wraps the upper end surface of the upper cover 1, three arc-shaped welding seams 11 are formed by laser welding the explosion-proof membrane 3 and the upper end surface of the upper cover 1, and the three arc-shaped welding seams 11 are uniformly distributed along the circumferential direction. The width of the arc-shaped welding line 11 is 1 mm; the length of the circular arc welding seam 11 is 20 mm. The resistance value of the end cover in the whole service life of the battery can be guaranteed to be less than or equal to 1m omega by a method of laser welding the power-off membrane 4 wrapped on the edge of the upper cover 1 and the upper cover 1.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. The utility model provides a battery end cover with safety protection function, includes upper cover (1) and sets up orifice plate frame (2) of upper cover (1) below, its characterized in that: also comprises an explosion-proof membrane (3) and a power-off membrane (4),
the hole plate frame (2) is fixedly provided with a hole plate (20), and the upper end face of the hole plate (20) is provided with a first mounting hole (5); a second mounting hole (6) is formed in the lower end face of the pore plate (20), the first mounting hole (5) is communicated with the second mounting hole (6), and a first boss (21) protruding upwards is arranged on the outer side of the first mounting hole (5) on the upper end face of the pore plate (20);
the anti-explosion diaphragm (3) is arranged between the upper cover (1) and the perforated plate frame (2), the edge of the anti-explosion diaphragm (3) is fixedly arranged on the upper cover (1), the anti-explosion diaphragm (3) gradually protrudes inwards from outside, the lower end face of the anti-explosion diaphragm (3) is welded and attached to the first boss (21), a positioning boss (7) protruding downwards is arranged in the middle of the lower end of the anti-explosion diaphragm (3), and the positioning boss (7) is arranged in the first mounting hole (5);
outage diaphragm (4) are installed in second mounting hole (6), the up end of outage diaphragm (4) with the lower terminal surface of location boss (7) sets up through the welding laminating.
2. A battery end cap with safety protection as claimed in claim 1, wherein: 16 welding spots are uniformly welded on the binding surface of the explosion-proof membrane (3) and the first boss (21), and the diameters of the welding spots are 0.4 mm.
3. A battery end cap with safety protection as claimed in claim 2, wherein: the 16 welding spots comprise 8 first welding spots (8) and 8 second welding spots (9), the first welding spots (8) and the second welding spots (9) are arranged at intervals, and the first welding spots (8) are uniformly distributed with phi 7 as a circumference; the second welding points (9) are uniformly distributed by taking phi 7.5 as a circumference.
4. A battery end cap with safety protection as claimed in claim 1, wherein: the utility model discloses a power failure diaphragm, including outage diaphragm (4), the even welding of binding face of location boss (7) has 4 third solder joints (10), the diameter of third solder joint (10) is 0.4 mm.
5. A battery end cap with safety protection as claimed in claim 1, wherein: the edge of the explosion-proof membrane (3) is wrapped on the upper end face of the upper cover (1), three sections of arc-shaped welding lines (11) are formed by the explosion-proof membrane (3) and the upper end face of the upper cover (1) through laser welding, and the three sections of arc-shaped welding lines (11) are uniformly distributed along the circumferential direction.
6. A battery end cap with safety protection as claimed in claim 5, wherein: the width of the arc-shaped welding line (11) is 1 mm; the length of the arc-shaped welding seam (11) is 20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020423919.2U CN211578795U (en) | 2020-03-27 | 2020-03-27 | Battery end cover with safety protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020423919.2U CN211578795U (en) | 2020-03-27 | 2020-03-27 | Battery end cover with safety protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211578795U true CN211578795U (en) | 2020-09-25 |
Family
ID=72527149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020423919.2U Expired - Fee Related CN211578795U (en) | 2020-03-27 | 2020-03-27 | Battery end cover with safety protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211578795U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111312939A (en) * | 2020-03-27 | 2020-06-19 | 江苏芯界新能源科技有限公司 | Battery end cover with safety protection function |
-
2020
- 2020-03-27 CN CN202020423919.2U patent/CN211578795U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111312939A (en) * | 2020-03-27 | 2020-06-19 | 江苏芯界新能源科技有限公司 | Battery end cover with safety protection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221014 Address after: Floor 5, Building 1, Rizhao Huachen Youhui High level Talent Innovation and Entrepreneurship Park, No. 71-8, Taiyuan Road, Rizhao Economic Development Zone, Shandong 276800 Patentee after: Rizhao Huifeng Energy Storage Technology Co.,Ltd. Address before: Jiangsu Xinjie New Energy Technology Co., Ltd., No.166, Yong'an South Road, Hai'an high tech Zone, Nantong City, Jiangsu Province, 226600 Patentee before: JIANGSU CORE-CIRCLES AMPEREX TECHNOLOGY Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200925 |