CN219498118U - Sodium ion battery pole piece assembly and sodium ion battery - Google Patents
Sodium ion battery pole piece assembly and sodium ion battery Download PDFInfo
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- CN219498118U CN219498118U CN202321753769.1U CN202321753769U CN219498118U CN 219498118 U CN219498118 U CN 219498118U CN 202321753769 U CN202321753769 U CN 202321753769U CN 219498118 U CN219498118 U CN 219498118U
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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 utility model relates to a sodium ion battery pole piece assembly and a sodium ion battery, belongs to the technical field of sodium ion batteries, and aims to solve the problems that in the existing pole piece assembly, when a pole lug is connected with a pole piece, the welding tensile strength is low and the pole lug is easy to fall off. The sodium ion battery pole piece assembly comprises a sodium ion battery pole lug and a pole piece, wherein the pole piece comprises a coating area and an uncoated area along the length direction, and the uncoated area is used as a foil-retaining area for welding the pole lug; the tab comprises an aluminum strip and a metal strip at least comprising a nickel layer; the aluminum belt and the metal belt are connected through a welding part; one end of the aluminum belt and one end of the metal belt are overlapped to form an overlapped part, and the welding part is positioned in the area of the overlapped part; one end of the aluminum belt, which is far away from the overlapping part, is fixed with the foil retaining area, and the overlapping part is positioned at the outer side of the pole piece; the width of the aluminum strip is smaller than that of the foil retaining area, a plurality of welding areas are arranged between the aluminum strip and the foil retaining area, and the welding areas are staggered. The welding tensile strength of the sodium ion battery pole piece component is high, and the sodium ion battery pole piece component is not easy to fall off.
Description
Technical Field
The utility model relates to the technical field of sodium ion batteries, in particular to a sodium ion battery pole piece assembly and a sodium ion battery.
Background
At present, aluminum foils are used as current collectors for positive plates and negative plates of sodium ion batteries, so that welding difficulty exists in connection between the negative plates and nickel-plated steel shells. The conventional solution is to select a connection mode of an aluminum-nickel composite belt, wherein one end of the aluminum-nickel composite belt is welded with an aluminum foil of a negative plate through an aluminum layer, and the other end of the aluminum-nickel composite belt is welded on a nickel-plated steel shell through a nickel layer. The nickel layer is welded on the nickel-plated steel shell by adopting resistance welding, and in the resistance welding process, the melting point of the nickel material is far higher than that of the aluminum material (the melting point of aluminum is 660 ℃ and the melting point of nickel is 1453 ℃), so that when the nickel is melted by absorbing heat, the aluminum material is liquefied, splashing is easily generated, and the welding quality is influenced. In the prior art, an aluminum-to-nickel mode is also provided, however, the problem that the welding tensile strength is low and the pole lug in the current pole piece assembly is easy to fall off exists when the pole lug is connected with the pole piece.
Disclosure of Invention
In view of the above analysis, the present utility model provides a sodium ion battery pole piece assembly and a sodium ion battery, which are used for solving one of the following technical problems: the problem that the welding tension strength is low and the pole piece is easy to fall off exists when the pole lug is connected with the pole piece in the existing pole piece assembly.
The utility model provides a sodium ion battery pole piece assembly, which comprises a sodium ion battery pole lug and a pole piece, wherein the pole piece comprises a coating area and an uncoated area along the length direction, and the uncoated area is used as a foil-retaining area for welding the sodium ion battery pole lug;
the sodium ion battery tab comprises an aluminum strip and a metal strip at least comprising a nickel layer; the aluminum belt and the metal belt are welded and connected through a welding part; wherein, one end of the aluminum belt and one end of the metal belt are overlapped to form an overlapped part, and the welding part is positioned in the area of the overlapped part;
one end of the aluminum strip of the sodium ion battery tab, which is far away from the overlapping part, is welded and fixed with the foil retaining area, and the overlapping part of the sodium ion battery tab is positioned at the outer side of the pole piece;
the width of the aluminum strip is smaller than that of the foil-retaining area;
the welding areas of the aluminum strips and the foil retaining areas are multiple, and the welding areas are staggered.
Optionally, the area of the overlapping area of the aluminum strip and the foil retaining area is 50% -70% of the area of the foil retaining area.
Optionally, the whole welding area of the welding areas is 10% -20% of the overlapping area of the aluminum strip and the foil-remaining area.
Alternatively, the two sides of each welded area are not exactly the same distance from the side edges of the adjacent aluminum strips.
Optionally, the width of the foil-retaining area is 5-12 mm.
Optionally, the welding portion of the aluminum strip and the metal strip includes a plurality of ultrasonic welding marks, and the plurality of ultrasonic welding marks are staggered.
Optionally, the welding part of the aluminum strip and the metal strip comprises two or more rows of welding spots, and the welding spots of two adjacent rows are staggered.
Optionally, the area of the foil-retaining area is 180-360 mm 2 。
Optionally, an end of the aluminum strip remote from the metal strip is located inside the foil-retaining region.
The utility model also provides a sodium ion battery, which comprises the sodium ion battery pole piece assembly.
Compared with the prior art, the utility model has at least one of the following beneficial effects:
(1) The width of the aluminum strip of the sodium ion battery pole piece assembly provided by the utility model is smaller than the width of the foil-retaining area, so that the aluminum strip can be prevented from contacting the coating area, and the production difficulty is reduced.
(2) The sodium ion battery pole piece assembly provided by the utility model has the advantages that the plurality of welding areas are staggered, the stress between the welding areas can be dispersed, the tensile strength between the pole lugs and the pole pieces is improved, the risk of the stress disconnection between the pole lugs and the pole pieces caused by vibration in the use process of the battery is reduced, meanwhile, the utilization rate of the welding areas is improved in a staggered arrangement mode of the welding areas, and the overcurrent capacity of the welding areas is improved.
(3) The welding part of the aluminum strip and the metal strip of the tab in the sodium ion battery pole piece assembly provided by the utility model has larger area, ensures high welding tensile strength of the welding part of the aluminum strip and the metal strip, is not easy to fall off, and simultaneously ensures high overcurrent capacity and good electric conductivity of the tab of the sodium ion battery.
(4) The welding marks or welding spots of the welding parts of the aluminum strips and the metal strips of the tab in the sodium ion battery pole piece assembly are staggered, so that the stress between the welding areas can be dispersed, the tensile strength between the aluminum strips and the metal strips is improved, the risk of stress separation of the aluminum strips and the metal strips caused by vibration in the use process of the battery is reduced, meanwhile, the actual contact area of the aluminum strips and the metal strips is improved in a staggered arrangement mode, the contact resistance between the aluminum strips and the metal strips is reduced, and the overcurrent capacity of the welding parts is improved.
In the utility model, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the utility model, like reference numerals being used to designate like parts throughout the drawings;
FIG. 1 is a schematic illustration of the structure of a sodium ion battery pole piece assembly of the present utility model;
FIG. 2 is a schematic view of the structure of a tab in a sodium ion battery pole piece assembly of the present utility model;
FIG. 3 is a schematic view of a sodium ion battery tab of the present utility model disposed on a PE back adhesive;
fig. 4 is a schematic structural view of a tab of a sodium ion battery in the sodium ion battery pole piece assembly of example 1;
FIG. 5 is a schematic view of the overlapping portion of the tabs of the sodium-ion battery in the sodium-ion battery pole piece assembly of example 1;
FIG. 6 is a schematic structural view of a sodium ion battery pole piece assembly of example 1;
FIG. 7 is a schematic illustration of the structure of the foil retention area of the sodium ion battery pole piece assembly of example 1;
fig. 8 is a schematic structural view of a tab of a sodium ion battery in the sodium ion battery pole piece assembly of example 2;
fig. 9 is a schematic view of the overlapping portion of the tabs of the sodium-ion battery in the sodium-ion battery pole piece assembly of example 2.
Reference numerals:
101-aluminum strips, 102-metal strips, 103-overlapping parts, 104-PE back glue, 105-welding marks, 106-welding spots, 2-pole pieces, 201-coating areas, 202-foil-leaving areas, 203-lower sides, 204-upper sides and 205-welding areas.
Detailed Description
The following detailed description of preferred embodiments of the utility model is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the utility model, are used to explain the principles of the utility model and are not intended to limit the scope of the utility model.
The utility model provides a sodium ion battery pole piece assembly, as shown in figure 1, the sodium ion battery pole piece assembly comprises a sodium ion battery pole lug and a pole piece 2, the pole piece 2 comprises a coating area 201 and an uncoated area along the length direction, and the uncoated area is used as a foil-retaining area 202 for welding the sodium ion battery pole lug; as shown in fig. 2, the tab of the sodium-ion battery includes an aluminum strip 101 and a metal strip 102 including at least one nickel layer; the aluminum strip 101 and the metal strip 102 are welded by a weld; wherein, one end of the aluminum strip 101 and one end of the metal strip 102 are overlapped to form an overlapped part 103, and the welding part is positioned in the area of the overlapped part 103; one end, far away from the overlapping part 103, of the aluminum strip 101 of the sodium ion battery tab is welded and fixed with the foil retaining area 202, and the overlapping part 103 of the sodium ion battery tab is positioned on the outer side of the pole piece 2; the width of the aluminum strip 101 is smaller than the width of the foil-retaining area 202; the number of the welding areas 205 is plural, and the plurality of welding areas 205 are arranged in a staggered manner.
In order to prevent the aluminum tape 101 from contacting the coating area 201, the width of the aluminum tape 101 is smaller than the width of the foil-leaving area 202, and both sides of the aluminum tape 101 are located inside the foil-leaving area 202 when welding.
Specifically, the pole piece 2 is defined as a lower side 203 on one side close to the metal strip 102, and an upper side 204 on the other side opposite to the lower side, and the distance between the overlapping portion 103 of the tab of the sodium ion battery and the lower side 203 is 1 to 4mm, for example, 1.2mm, 1.5mm, 1.7mm, 2.0mm, 2.2mm, 2.5mm, 2.7mm, 3.0mm, 3.2mm, 3.5mm, and 3.7mm.
Specifically, one end of the aluminum strip 101 far away from the metal strip 102 is located at the inner side of the foil retaining area 202, and the distance between the one end of the aluminum strip 101 far away from the metal strip 102 and the upper side 204 of the pole piece 2 is 2-4 mm, for example, 2.2mm, 2.5mm, 2.7mm, 3.0mm, 3.2mm, 3.5mm, and 3.7mm.
Specifically, the width of the foil-retaining area 202 is 5-12 mm, for example 6mm, 7mm, 8mm, 9mm, 10mm, 11mm.
Specifically, the area of the foil-retaining area 202 is 180-360 mm 2 。
Specifically, the area of the overlapping area of the aluminum strip 101 and the foil-retaining area 202 is 50% -70% of the area of the foil-retaining area 202, so that the aluminum strip 101 is convenient to position, the processing difficulty is reduced, the aluminum strip 101 is ensured not to be in contact with the coating area 201, the welding tensile strength of the aluminum strip 101 and the pole piece 2 is ensured to be high, the falling is difficult, the overcurrent capacity is high, and the electric conductivity is good.
Specifically, the number of the welding areas 205 between the aluminum tape 101 and the foil-retaining area 202 may be plural, for example, 2, 3, 4, 5 welding areas may be plural.
Specifically, in order to ensure that the welding tensile strength of the aluminum strip 101 and the pole piece 2 is high, the whole welding area of the aluminum strip 101 and the foil-leaving area 202 is controlled to be 10% -20% of the overlapping area of the aluminum strip 101 and the foil-leaving area 202.
Specifically, the distance between adjacent welding areas 205 is 6-10 mm, for example 7mm, 8mm, 9mm.
Specifically, the distances between different adjacent weld areas 205 are not exactly the same.
Specifically, the line connecting the centers of the adjacent welding regions 205 is not parallel or perpendicular to the longitudinal direction of the aluminum strip 101, i.e., the plurality of welding regions 205 are arranged in a staggered manner.
Specifically, the distance between the two sides of the welded region 205 and the side of the adjacent aluminum strip 101 is not exactly the same.
The arrangement of the welding areas can play a role in dispersing stress among the welding areas, improve tensile strength between the lugs and the pole pieces, reduce risks of stress disconnection of the lugs and the pole pieces caused by vibration in the use process of the battery, improve the utilization rate of the welding areas in a staggered arrangement mode, and improve the overcurrent capacity of the welding areas.
Specifically, the length of the overlapping portion 103 of the tab of the sodium ion battery is 2-4 mm; the area of the welded portion is 40% -80% of the area of the overlapped portion 103. So set up, guarantee that the area of the welded part of aluminium strip and strap of sodium ion battery tab is great, guarantee that the welding tensile strength of welded part of aluminium strip and strap is high, be difficult for droing, guarantee that the overflow ability of sodium ion battery tab is high simultaneously, the conductibility is good.
Specifically, the metal belt 102 may be a pure nickel belt, or may be a steel nickel belt, a copper nickel belt, or an aluminum nickel composite belt.
Specifically, the thickness of the aluminum tape 101 is 0.1mm to 0.3mm, for example, 0.13mm, 0.15mm, 0.17mm, 0.2mm, 0.25mm, 0.27mm.
Specifically, the thickness of the metal strip 102 is 0.1mm to 0.3mm, for example, 0.13mm, 0.15mm, 0.17mm, 0.2mm, 0.25mm, 0.27mm.
Specifically, in order to increase the area of the welded portion and to increase the conduction efficiency of the tab, the aluminum strip 101 and the metal strip 102 have the same width.
Specifically, the width of the aluminum tape 101 is 3 to 10mm, for example, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm.
Specifically, considering that the area of the overlapping portion 103 is too small, the area of the welded portion is too small, the welding tensile strength is low, the welding tensile strength is easy to fall off, and the conductivity is poor, the length of the overlapping portion 103 is controlled to be 2 to 4mm, and the overlapping portion 1The area of 03 is: 8-24 mm 2 。
Specifically, the area of the welded portion between the aluminum strip 101 and the metal strip 102 is 6 to 16mm 2 Therefore, the welding tension strength of the tab can be ensured to be high, the tab is not easy to fall off, the overcurrent capacity is high, and the conductivity is good.
Specifically, the aluminum strip 101 and the metal strip 102 may be welded by laser welding or ultrasonic welding.
Specifically, when ultrasonic welding is adopted, the welding portion between the aluminum strip 101 and the metal strip 102 includes a plurality of ultrasonic welding marks 105, and the plurality of ultrasonic welding marks 105 are staggered, that is, the connecting line of the centers of the two ultrasonic welding marks 105 is not parallel or perpendicular to the length direction of the tab.
Specifically, when laser welding is adopted, two or more rows of welding spots 106 are arranged at the welding part of the aluminum strip 101 and the metal strip 102, the welding spots 106 of two adjacent rows are staggered, and the number of the welding spots 106 of at least one row is smaller than that of the welding spots 106 of the adjacent row. Definition of the weld portion of laser welding: the area is formed by encircling a tangent line above the welding spots of the uppermost row, a tangent line below the welding spots of the lowermost row, a common tangent line of the left welding spots of the uppermost row and the left welding spots of the lowermost row and a common tangent line of the right welding spots of the uppermost row and the right welding spots of the lowermost row. As shown in fig. 6, the welded portion of the laser welding is an area surrounded by a broken line.
The arrangement of the welding parts can play a role in dispersing stress between the welding areas, improve the tensile strength between the aluminum belt and the metal belt, reduce the risk of stress disconnection of the aluminum belt and the metal belt caused by vibration in the use process of the battery, improve the actual contact area of the aluminum belt and the metal belt in a staggered arrangement mode, reduce the contact resistance between the aluminum belt and the metal belt, and improve the overcurrent capacity of the welding parts.
Specifically, as shown in fig. 3, in the production process, a plurality of sodium ion battery tabs may be attached to the upper portion of the PE back adhesive 104, and wound into a tab roll.
The utility model also provides a sodium ion battery, which comprises the pole piece assembly.
Specifically, the sodium ion battery further comprises a steel shell, and the metal belt 102 in the pole piece assembly is welded and fixed with the steel shell.
The beneficial effects of the sodium ion battery are the same as those of the sodium ion battery pole piece assembly, and the description is omitted here.
Example 1
The embodiment provides a sodium ion battery pole piece assembly, as shown in fig. 6, the sodium ion battery pole piece assembly comprises a sodium ion battery pole lug and a pole piece 2, the pole piece 2 comprises a coating area 201 and an uncoated area along the length direction, and the uncoated area is used as a foil-retaining area 202 for welding the sodium ion battery pole lug; as shown in fig. 2, the tab of the sodium-ion battery includes an aluminum strip 101 and a metal strip 102 including at least one nickel layer; the aluminum strip 101 and the metal strip 102 are welded by a weld; wherein, one end of the aluminum strip 101 and one end of the metal strip 102 are overlapped to form an overlapped part 103, and the welding part is positioned in the area of the overlapped part 103; one end, far away from the overlapping part 103, of the aluminum strip 101 of the sodium ion battery tab is welded and fixed with the foil retaining area 202, and the overlapping part 103 of the sodium ion battery tab is positioned on the outer side of the pole piece 2; the width of the aluminum strip 101 is smaller than the width of the foil-retaining area 202.
Specifically, metal strip 102 is a steel nickel plated strip.
Specifically, the thickness of the aluminum tape 101 is 0.1mm, the thickness of the metal tape 102 is 0.1mm, the width of the aluminum tape 101 is 4mm, and the length of the overlapping portion 103 is 3mm; the area of the weld is 60% of the area of the overlap 103.
The aluminum strip 101 and the metal strip 102 are welded by laser welding, as shown in fig. 4, two rows of welding spots 106 are arranged in the overlapping portion 103, the welding spots 106 of the two rows are staggered, and the number of welding spots of one row is smaller than that of the adjacent welding spots of the other row.
As shown in fig. 5, the length of the overlapping portion 103 in the tab length direction is L, and the distance y1=10% L between the row of welding spots 106 near the upper edge of the overlapping portion 103 and the upper edge of the overlapping portion 103, and the distance y2=11% L between the row of welding spots near the lower edge of the overlapping portion 103 and the lower edge of the overlapping portion 103.
Specifically, the lower side 203 is defined as one side of the pole piece 2 near the metal belt 102, and the upper side 204 is defined as the opposite side, so that the distance between the overlapping portion 103 of the tab of the sodium ion battery and the lower side 203 is 2mm.
The width of the foil-retaining area 202 is 6mm, and both sides of the aluminum strip 101 are positioned at the inner side of the foil-retaining area 202 during welding.
Specifically, the end of the aluminum strip 101 away from the metal strip 102 is located inside the foil-retaining region 202, and the distance between the end of the aluminum strip 101 away from the metal strip 102 and the upper side 204 of the pole piece 2 is 4mm.
Specifically, the area of the foil-retaining area 202 is 240mm 2 。
Specifically, the area of the overlapping area of the aluminum tape 101 and the foil-retaining area 202 is 56% of the area of the foil-retaining area 202,
specifically, the number of welding areas 205 between the aluminum tape 101 and the foil-retaining area 202 is 3.
Specifically, the overall welding area of the aluminum tape 101 and the foil-leaving area 202 is controlled to be 17% of the overlapping area of the aluminum tape 101 and the foil-leaving area 202.
Specifically, as shown in fig. 7, the length of the overlapping portion between the aluminum strip 101 and the pole piece 2 is H, and the welding area between the aluminum strip 101 and the pole piece 2 is divided into a first welding area, a second welding area, and a third welding area from the position close to the lower edge of the pole piece 2, where the distance between the first welding area and the lower edge of the pole piece 2 is s1= 6%H, the distance between the second welding area and the lower edge of the pole piece is s2=30%h, and the distance between the third welding area and the lower edge of the pole piece is s3=88%h.
Specifically, the distances between the first welding area and two sides of the tab are different, the distances between the second welding area and two sides of the tab are different, the sides with smaller distances between the tab and the first welding area and between the tab and the second welding area are not the same side, one side of the tab is smaller than the first welding area and is 25% of the width K of the aluminum strip, and the distance between the other side of the tab and the second welding area is smaller than the second welding area and is 25% of the width K of the tab.
The setting of this embodiment can play the effect of dispersing the stress between each welded area, improves the tensile strength between utmost point ear and the pole piece, reduces the risk that the battery is used because of vibrations leads to utmost point ear and pole piece atress to be released, and the mode that welded area staggers simultaneously has improved the utilization ratio of welded area, has improved welded area's overflow ability.
Example 2
The present embodiment provides a sodium ion battery pole piece assembly, and the structure of the sodium ion battery pole piece assembly of the present embodiment is substantially the same as that of embodiment 1, except that:
specifically, in this embodiment, the aluminum strip 101 and the metal strip 102 are welded by ultrasonic welding, as shown in fig. 8, two ultrasonic welding marks are disposed in the overlapping portion 103, and the connecting line of the centers of the two ultrasonic welding marks is not parallel or perpendicular to the length direction of the tab.
As shown in fig. 9, the length of the overlapping portion 103 in the tab length direction is L, and the distance x1=10%l between the weld mark near the upper edge of the overlapping portion 103 and the upper edge of the overlapping portion 103; the distance x2=11%l between the weld mark near the lower edge of the overlap portion 103 and the lower edge of the overlap portion 103.
Example 3
The present embodiment provides a sodium ion battery, which includes the sodium ion battery pole piece assembly of embodiment 1 or 2 described above.
Specifically, the sodium ion battery further comprises a steel shell, and the metal belt 102 in the pole piece assembly is welded and fixed with the steel shell.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model.
Claims (10)
1. The sodium ion battery pole piece assembly is characterized by comprising a sodium ion battery pole lug and a pole piece (2), wherein the pole piece (2) comprises a coated area (201) and an uncoated area along the length direction, and the uncoated area is used as a foil-retaining area (202) for welding the sodium ion battery pole lug;
the sodium ion battery tab comprises an aluminum strip (101) and a metal strip (102) at least comprising a nickel layer; the aluminum strip (101) and the metal strip (102) are welded and connected through a welding part; wherein one end of the aluminum strip (101) and one end of the metal strip (102) are overlapped to form an overlapped part (103), and the welding part is positioned in the area of the overlapped part (103);
one end, far away from the overlapping part (103), of the aluminum strip (101) of the sodium ion battery tab is welded and fixed with the foil retaining area (202), and the overlapping part (103) of the sodium ion battery tab is positioned at the outer side of the pole piece (2);
the width of the aluminum strip (101) is smaller than the width of the foil-leaving area (202);
the aluminum strip (101) and the foil retaining area (202) have a plurality of welding areas (205), and the plurality of welding areas (205) are staggered.
2. The sodium ion battery pole piece assembly of claim 1, wherein the overlap area of the aluminum strip (101) and the foil retention area (202) is 50% -70% of the area of the foil retention area (202).
3. The sodium ion battery pole piece assembly of claim 1, wherein the overall welding area of the plurality of welding areas is 10% -20% of the overlapping area of the aluminum strip (101) and the foil retention area (202).
4. A sodium ion battery pole piece assembly according to claim 3, wherein the two sides of each welding zone (205) are not exactly the same distance from the side of an adjacent aluminium strip (101).
5. The sodium ion battery pole piece assembly of claim 1, wherein the foil-retaining region (202) has a width of 5-12 mm.
6. The sodium ion battery pole piece assembly of claim 1, wherein the weld of the aluminum strip (101) to the metal strip (102) comprises a plurality of ultrasonic welds (105), the plurality of ultrasonic welds (105) being staggered.
7. The sodium ion battery pole piece assembly of claim 1, wherein the weld of the aluminum strip (101) to the metal strip (102) comprises two or more rows of welds (106), with adjacent rows of welds (106) being staggered.
8. The sodium ion battery pole piece assembly of claim 1, wherein the area of the foil-retaining region (202) is 180-360 mm 2 。
9. The sodium ion battery pole piece assembly of any of claims 1 to 8, wherein an end of the aluminum strip (101) remote from the metal strip (102) is located inside the foil retention zone (202).
10. A sodium ion battery comprising a sodium ion battery pole piece assembly according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321753769.1U CN219498118U (en) | 2023-07-06 | 2023-07-06 | Sodium ion battery pole piece assembly and sodium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321753769.1U CN219498118U (en) | 2023-07-06 | 2023-07-06 | Sodium ion battery pole piece assembly and sodium ion battery |
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| CN219498118U true CN219498118U (en) | 2023-08-08 |
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| CN202321753769.1U Active CN219498118U (en) | 2023-07-06 | 2023-07-06 | Sodium ion battery pole piece assembly and sodium ion battery |
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- 2023-07-06 CN CN202321753769.1U patent/CN219498118U/en active Active
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