CN218946618U - Ultrasonic welding device, battery cell and battery module - Google Patents
Ultrasonic welding device, battery cell and battery module Download PDFInfo
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- CN218946618U CN218946618U CN202223105583.3U CN202223105583U CN218946618U CN 218946618 U CN218946618 U CN 218946618U CN 202223105583 U CN202223105583 U CN 202223105583U CN 218946618 U CN218946618 U CN 218946618U
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- 238000003466 welding Methods 0.000 title claims abstract description 163
- 238000003825 pressing Methods 0.000 claims abstract description 69
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 13
- 238000005336 cracking Methods 0.000 abstract description 8
- 238000009826 distribution Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000012360 testing method 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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Abstract
The application provides an ultrasonic welding device, electric core and battery module relates to battery technology field. The ultrasonic welding head of the ultrasonic welding device is provided with a pressing surface for abutting against a workpiece to be welded, and the ultrasonic welding head can be driven to vibrate in a first direction which is parallel to the pressing surface. The size of the pressing surface in the first direction is 4-25 mm, the size of the pressing surface in the second direction is 2-8 mm, the second direction is parallel to the pressing surface and perpendicular to the first direction, and the amplitude of the ultrasonic welding head is 0.024-0.03 mm. Through the design of the size of the pressing surface of the ultrasonic welding head in the vibration direction, the size of the pressing surface of the ultrasonic welding head in the vertical vibration direction and the amplitude, the electrode lugs and the electrode plates of the battery core can be guaranteed to have better welding effect, and the problems of cold joint, electrode lug cracking and the like are not easy to occur. The lug and the pole piece of the battery cell provided by the application are welded through the ultrasonic welding device, and the battery module provided by the application comprises the battery cell.
Description
Technical Field
The application relates to the technical field of batteries, in particular to an ultrasonic welding device, an electric core and a battery module.
Background
Ultrasonic welding is to transfer high-frequency vibration waves to the surfaces of two objects to be welded, and under the condition of pressurization, the surfaces of the two objects are rubbed with each other to form fusion between molecular layers. Ultrasonic welding is commonly applied to lithium ion batteries at present, and can be used for welding tabs and pole pieces. However, the existing welding device generally has the problem of insufficient structural strength due to cold joint in the welding process. There is also a problem in that the tab is cracked by increasing the power of the welding device in order to improve the cold joint. The poor consistency of the battery cells, such as wide DCR distribution of the battery cells and wide temperature rise performance distribution of the battery, can be caused by cold welding or electrode lug cracking.
Disclosure of Invention
An object of the present application is to provide an ultrasonic welding device, a battery cell and a battery module. The ultrasonic welding device has good welding effect on the tab and the pole piece; the electrode lugs and the electrode plates of the battery cell are welded through the ultrasonic welding device, so that the battery cell has better connection stability, and better performance of the battery cell is ensured. The battery module comprises the battery cell.
Embodiments of the present application are implemented as follows:
in a first aspect, the application provides an ultrasonic welding device, including an ultrasonic welding head, the ultrasonic welding head has a pressing surface for abutting against a workpiece to be welded, the ultrasonic welding head can be driven to vibrate in a first direction, the first direction is parallel to the pressing surface, the pressing surface has a size of 4-25 mm in the first direction, the pressing surface has a size of 2-8 mm in a second direction, the second direction is parallel to the pressing surface and perpendicular to the first direction, and the amplitude of the ultrasonic welding head is 0.024-0.03 mm.
In an alternative embodiment, the pressing surface is provided with a plurality of welding teeth for abutting against the piece to be welded in a protruding manner.
In an alternative embodiment, the welding teeth are arranged in an array on the pressing surface.
In an alternative embodiment, the pressing surface is rectangular, two of the pressing surfaces extend along the first direction, and the other two of the pressing surfaces extend along the second direction.
In an alternative embodiment, the welding power of the ultrasonic welding device is 1000-1600W.
In an alternative embodiment, the ultrasonic welding device comprises a transducer and a horn, the transducer is in transmission connection with the horn, the ultrasonic welding head is in transmission connection with the horn, and the transducer is used for converting electric energy into mechanical energy.
In a second aspect, the present application provides an electrical cell comprising a pole piece and a tab, the pole piece and the tab being welded by an ultrasonic welding device according to any one of the preceding embodiments.
In an alternative embodiment, the pole piece and the tab satisfy the formula when welded: 100< l p/(D (10 h+l) +fz 10) <200; wherein L is the dimension of the pressing surface of the ultrasonic welding head in the first direction, and the unit is mm; p is the welding power of the ultrasonic welding device, and the unit is W; h is the thickness of the electrode lug, the unit is mm, D is the dimension of the pressing surface of the ultrasonic welding head in the second direction, and the unit is mm; f is welding pressure in psi; z is the welding amplitude in mm.
In an alternative embodiment, the tab is made of aluminum.
In a third aspect, the present application provides a battery module comprising the electrical core according to any one of the preceding embodiments.
The beneficial effects of the embodiment of the application are that:
the ultrasonic welding head of the ultrasonic welding device provided by the embodiment of the application is provided with the pressing surface for abutting against the workpiece to be welded, and the ultrasonic welding head can be driven to vibrate in a first direction which is parallel to the pressing surface. The size of the pressing surface in the first direction is 4-25 mm, the size of the pressing surface in the second direction is 2-8 mm, the second direction is parallel to the pressing surface and perpendicular to the first direction, and the amplitude of the ultrasonic welding head is 0.024-0.03 mm. In ultrasonic welding, the pressing surface is used for abutting against a welding part, and the size and the amplitude of the pressing surface can directly influence the welding quality. According to the ultrasonic welding head, the size of the pressing surface of the ultrasonic welding head in the vibration direction (the first direction), the size of the pressing surface of the ultrasonic welding head in the vertical vibration direction (the second direction) and the amplitude are designed, so that the electrode lug and the electrode plate of the battery core can be guaranteed to have better welding effect, and the problems of cold welding, electrode lug cracking and the like are not easy to occur.
The lug and the pole piece of the battery cell are welded through the ultrasonic welding device, so that the problems of cold joint and cracking are not easy to occur, and the performance of the battery cell is stable and the consistency is better. The battery module provided by the application comprises the battery cell.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of an ultrasonic horn of an ultrasonic welding apparatus in one embodiment of the present application.
100-ultrasonic welding head; 110-a welding head body; 111-pressing surface; 112-welding teeth; 120-connection.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships that are conventionally put in use of the inventive product, are merely for convenience of description of the present application and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Ultrasonic welding is to transfer high-frequency vibration waves to the surfaces of two objects to be welded, and under the condition of pressurization, the surfaces of the two objects are rubbed with each other to form fusion between molecular layers. Ultrasonic welding is commonly applied to lithium ion batteries at present, and can be used for welding tabs and pole pieces. However, the existing welding device generally has the problem of insufficient structural strength due to cold joint in the welding process. There is also a problem in that the tab is cracked by increasing the power of the welding device in order to improve the cold joint. The poor consistency of the battery cells, such as wide DCR distribution of the battery cells and wide temperature rise performance distribution of the battery, can be caused by cold welding or electrode lug cracking.
The inventors found that the cause of the cold joint problem is that the length and width of the ultrasonic welding head, the direction and amplitude of vibration are unreasonable, and the thickness of the to-be-welded piece such as the tab is improperly matched. Because the energy transferred to the ultrasonic welding head is transferred to the middle position of the pressing surface, when the width (the dimension in the vertical vibration direction) of the pressing surface of the ultrasonic welding head is too large, the energy transferred to the two ends of the ultrasonic welding head in the width direction in the welding process is scattered, and the insufficient energy of the two ends can cause the two ends to generate cold joint. Moreover, the welding effect is improved by increasing the power and the pressure during welding, and the amplitude transmitted to the two ends in the width direction cannot reach the set value, so that the heat generated by friction is insufficient, the plastic deformation of the welding piece is insufficient, and the welding effect is poor. The size of the pressing surface in the vertical ultrasonic welding vibration direction is too long, long-time welding can lead to large middle stress and small stress on two sides of the ultrasonic welding head, the two ends of the ultrasonic welding head in the width direction are tilted, and finally the ultrasonic welding head is scrapped.
In addition, the welding quality is related to the size of a piece to be welded (such as a tab), and the current welding process has the problem that the tab and an ultrasonic welding head are not reasonably matched, so that the performance of a battery core is poor.
In order to solve the problems of poor welding effect and unstable battery cell performance of the ultrasonic welding device in the prior art, the embodiment of the application provides an ultrasonic welding device, and the welding effect is improved by optimizing the size and the amplitude of an ultrasonic welding head. The embodiment of the application also provides a battery cell, wherein the electrode lugs and the electrode plates of the battery cell are welded through the ultrasonic welding device, so that the battery cell has better performance. The embodiment of the application also provides a battery module comprising the battery cell.
An ultrasonic welding apparatus (not shown) provided in an embodiment of the present application includes an ultrasonic generator, a transducer, a horn, and an ultrasonic horn 100. Wherein the sonotrode is used to convert electrical current (e.g., 50/60Hz current) into high frequency electrical energy (e.g., 15, 20, 30, or 40KHz electrical energy). The transducer is in driving connection with the horn and the ultrasonic horn 100 is in driving connection with the horn, the transducer being used to convert electrical energy into mechanical energy. The high frequency electrical energy converted by the sonotrode may be converted by the transducer into an equally frequency mechanical motion, which is then transmitted to sonotrode 100 through a set of amplitude-variable horns. Ultrasonic horn 100 transfers the received vibrational energy to the joint of the pieces to be welded. The vibration energy is converted into heat energy by friction at the joint of the pieces to be welded, thereby welding the two pieces to be welded together.
Fig. 1 is a schematic view of an ultrasonic horn 100 of an ultrasonic welding apparatus in one embodiment of the present application. As shown in fig. 1, the ultrasonic horn 100 includes a horn body 110 and a connecting portion 120 connected to the horn body 110, the connecting portion 120 being adapted to be in driving engagement with the horn so as to vibrate the horn body 110. In this embodiment, the ultrasonic horn 100 may be driven to vibrate in a first direction, and the connection portion 120 is connected to one end of the horn body 110 in the first direction and extends in the first direction.
In this embodiment, the welding head main body 110 is a cuboid, the welding head main body 110 is provided with a pressing surface 111 for abutting against a workpiece to be welded, the pressing surface 111 is a rectangular plane, and the size of the pressing surface 111 basically determines the size of a welding mark. Since the bonding tool body 110 has a rectangular parallelepiped shape, the pressing surface 111 constitutes one of six surfaces of the bonding tool body 110, and the length and width of the bonding tool body 110 are identical to those of the pressing surface 111. As shown in fig. 1, two of the pressing surfaces 111 extend in a first direction, and the other two extend in a second direction.
In this embodiment, the pressing surface 111 is convexly provided with a plurality of welding teeth 112 for abutting against the workpiece to be welded, and optionally, the welding teeth 112 are arrayed on the pressing surface 111. The ultrasonic horn 100 abuts the workpiece to be welded by the teeth 112 on the abutment surface 111, so that the workpiece to be welded can be abutted uniformly and at multiple points. Further, the plurality of welding teeth 112 are arranged in a rectangular array, uniformly arranged on the entire pressing face 111. Of course, in alternative other embodiments, the welding teeth 112 may be arranged in a circular array, the shapes of the welding head main body 110 and the pressing surface 111 may be selected according to needs, and the length and width dimensions of the pressing surface 111 may be smaller than those of the welding head main body 110.
In this embodiment, the first direction (i.e., the vibration direction) is parallel to the pressing surface 111, the dimension of the pressing surface 111 in the first direction is 4 to 25mm, the dimension of the pressing surface 111 in the second direction is 2 to 8mm, the second direction is parallel to the pressing surface 111 and perpendicular to the first direction, and the amplitude of the ultrasonic horn 100 is 0.024 to 0.03mm. As shown in fig. 1, the dimension of the pressing surface 111 in the first direction is larger than that in the second direction, so that insufficient energy at both end positions in the second direction at the time of welding can be avoided to cause cold joint.
In this embodiment, the welding power of the ultrasonic welding device is 1000-1600W, and the welding power can be adjusted according to the size of the ultrasonic welding head 100, the size of the workpiece to be welded (such as a tab), the welding pressure, and the like.
In this embodiment, the welding pressure of sonotrode 100 is 23-38 psi, which may be adjusted according to the size of sonotrode 100, the size of the piece to be welded (e.g., tab), the welding power, etc.
The embodiment of the application provides an electric core (not shown in the figure), which comprises a pole piece and a pole lug, wherein the pole piece and the pole lug are welded through the ultrasonic welding device of the embodiment. The electrode lugs and the electrode plates welded by the ultrasonic welding device are good in connection stability, the problems of cold welding, cracking and the like are not easy to occur, and the obtained battery core is stable in performance and good in consistency.
In the embodiment, the battery cell is a lithium ion battery cell, the capacity of the battery cell is 72Ah, and the total thickness of the electrode lugs is 0.78mm; the positive electrode material adopts 333 positive electrode and the negative electrode adopts graphite system.
The embodiment of the application designs the parameter selection of the ultrasonic welding head 100 when welding the electrode lug and the electrode piece. Specifically, the formula is satisfied when pole piece and tab are welded: 100< l p/(D (10 h+l) +fz 10) <200; wherein L is the dimension of the abutment surface 111 of the ultrasonic horn 100 in mm in the first direction; p is the welding power of the ultrasonic welding device, and the unit is W; h is the thickness of the tab in mm, D is the dimension of the abutment surface 111 of the ultrasonic horn 100 in the second direction in mm; f is welding pressure in psi; z is the welding amplitude in mm.
In this embodiment, the tab is made of aluminum. According to the thickness of the tab to be welded, by selecting the dimensions of the pressing surface 111 in the first direction and the second direction, the welding pressure, the welding amplitude, the welding power, and other parameters within the range satisfying the above formula, a preferable welding pattern and welding effect can be obtained. In this embodiment, the welding effect is mainly reflected by DCR data (direct current impedance) and temperature rise data of the battery cell.
The cell discharge DCR test procedure may employ an existing test method, such as testing according to the following steps:
1. standing for 5 minutes;
2、1.0C CC to 4.25V and CV to I≤0.05C；
3. standing for 60 minutes;
4. 1.0C DC to 2.8V (recording capacity C0);
5. standing for 60 minutes;
6、1.0C CC to 4.25V and CV to I≤0.05C0；
7. standing for 60 minutes;
8. 1C0 DC to 30min (adjusted to 50% SOC);
9. standing for 60min;
10. 3c0 DC 10S (record the first step resting voltage as V0, record the voltage at this point at 10S as V1);
dcr= (V0-V1)/3C 0 (where voltage unit V, current unit a).
Tables 1 and 2 show the effect of different dimensional parameters of the ultrasonic horn on the cell.
Table 1:
table 2:
tables 3, 4 show the effect of different welding powers on the cell welding.
Table 3:
table 4:
as can be seen from tables 1 to 4, when the formula L/(D (10 h+l) +fz 10) is satisfied in the range of 100 to 200, the DCR data and the temperature rise data perform better. Therefore, by adopting the ultrasonic welding device provided by the embodiment of the application and assisting in reasonable ultrasonic welding head matching, the battery cell electrode lug and the electrode plate can be ensured to have better welding effect, and the performance of the battery cell can be further ensured.
An embodiment of the present application provides a battery module, including any one of the foregoing battery cells. The battery module may also include other components outside of the cells, such as CCS assemblies, etc. The other component arrangement modes of the battery module can refer to the prior art, and are not repeated here.
In summary, the ultrasonic welding head of the ultrasonic welding device provided by the embodiment of the application is provided with the pressing surface for abutting against the workpiece to be welded, and the ultrasonic welding head can be driven to vibrate in the first direction, and the first direction is parallel to the pressing surface. The size of the pressing surface in the first direction is 4-25 mm, the size of the pressing surface in the second direction is 2-8 mm, the second direction is parallel to the pressing surface and perpendicular to the first direction, and the amplitude of the ultrasonic welding head is 0.024-0.03 mm. In ultrasonic welding, the pressing surface is used for abutting against a welding part, and the size and the amplitude of the pressing surface can directly influence the welding quality. According to the ultrasonic welding head, the size of the pressing surface of the ultrasonic welding head in the vibration direction (the first direction), the size of the pressing surface of the ultrasonic welding head in the vertical vibration direction (the second direction) and the amplitude are designed, so that the electrode lug and the electrode plate of the battery core can be guaranteed to have better welding effect, and the problems of cold welding, electrode lug cracking and the like are not easy to occur.
The lug and the pole piece of the battery cell are welded through the ultrasonic welding device, so that the problems of cold joint and cracking are not easy to occur, and the performance of the battery cell is stable and the consistency is better. The battery module provided by the application comprises the battery cell.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. An ultrasonic welding device is characterized by comprising an ultrasonic welding head, wherein the ultrasonic welding head is provided with a pressing surface for abutting against a workpiece to be welded, the ultrasonic welding head can be driven to vibrate in a first direction, the first direction is parallel to the pressing surface, the size of the pressing surface in the first direction is 4-25 mm, the size of the pressing surface in a second direction is 2-8 mm, the second direction is parallel to the pressing surface and perpendicular to the first direction, and the amplitude of the ultrasonic welding head is 0.024-0.03 mm.
2. The ultrasonic welding apparatus according to claim 1, wherein the pressing surface is provided with a plurality of welding teeth protruding therefrom for abutting the member to be welded.
3. The ultrasonic welding apparatus according to claim 2, wherein the welding teeth are arranged in an array on the pressing face.
4. The ultrasonic welding apparatus according to claim 1, wherein the pressing surface is rectangular, two of the pressing surfaces extend in the first direction, and the other two extend in the second direction.
5. The ultrasonic welding apparatus according to claim 1, wherein the welding power of the ultrasonic welding apparatus is 1000 to 1600W.
6. The ultrasonic welding apparatus of claim 1 wherein the ultrasonic welding apparatus comprises a transducer and a horn, the transducer in driving connection with the horn, the ultrasonic horn in driving connection with the horn, the transducer configured to convert electrical energy to mechanical energy.
7. An electrical cell comprising a pole piece and a tab, the pole piece and the tab being welded by the ultrasonic welding device of any one of claims 1-6.
8. The cell of claim 7, wherein the pole piece and the tab when welded satisfy the formula: 100< l p/(D (10 h+l) +fz 10) <200; wherein L is the dimension of the pressing surface of the ultrasonic welding head in the first direction, and the unit is mm; p is the welding power of the ultrasonic welding device, and the unit is W; h is the thickness of the electrode lug, the unit is mm, D is the dimension of the pressing surface of the ultrasonic welding head in the second direction, and the unit is mm; f is welding pressure in psi; z is the welding amplitude in mm.
9. The cell of claim 7, wherein the tab is aluminum.
10. A battery module comprising the cell of any one of claims 7-9.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024098863A1 (en) * | 2023-06-30 | 2024-05-16 | 湖北亿纬动力有限公司 | Tab welding structure and battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024098863A1 (en) * | 2023-06-30 | 2024-05-16 | 湖北亿纬动力有限公司 | Tab welding structure and battery |
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Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Patentee after: Jiangsu Zhengli New Energy Battery Technology Co.,Ltd. Country or region after: China Address before: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Patentee before: Jiangsu Zenergy Battery Technologies Co.,ltd Country or region before: China |