WO2022047674A1 - Ensemble cellule et dispositif électrochimique - Google Patents

Ensemble cellule et dispositif électrochimique Download PDF

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Publication number
WO2022047674A1
WO2022047674A1 PCT/CN2020/113062 CN2020113062W WO2022047674A1 WO 2022047674 A1 WO2022047674 A1 WO 2022047674A1 CN 2020113062 W CN2020113062 W CN 2020113062W WO 2022047674 A1 WO2022047674 A1 WO 2022047674A1
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WIPO (PCT)
Prior art keywords
pole piece
winding body
winding
assembly
piece assembly
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Application number
PCT/CN2020/113062
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English (en)
Chinese (zh)
Inventor
金哲生
郭章飞
安家新
Original Assignee
宁德新能源科技有限公司
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Application filed by 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to PCT/CN2020/113062 priority Critical patent/WO2022047674A1/fr
Priority to CN202080074371.8A priority patent/CN114631211B/zh
Publication of WO2022047674A1 publication Critical patent/WO2022047674A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of electrochemical devices, and in particular, to a cell assembly and an electrochemical device.
  • the embodiments of the present application provide a cell assembly and an electrochemical device, which directly form a special-shaped cell structure by winding, which effectively solves the risks brought about by complicated processes, limited structure and transfer welding.
  • a cell assembly includes: a first winding body, including a first pole piece assembly, the first winding body is formed by winding the first pole piece assembly around a first winding axis; and
  • the second winding body includes a second pole piece assembly, and the second winding body is formed by winding the second pole piece assembly around a second winding axis; wherein, the outermost part of the first pole piece assembly
  • the ring is electrically connected to the outermost ring of the second pole piece assembly, the first winding body and the second winding body are arranged in the same layer, wherein the first winding body and the first winding body are arranged in the same layer.
  • the dimensions of the two winding bodies are different.
  • an electrochemical device which includes the cell assembly as described above.
  • the battery core assembly includes: a first winding body, including a first pole piece assembly, and the first winding body is formed by the first winding body.
  • the pole piece assembly is wound around the first winding axis; and the second winding body includes a second pole piece assembly, and the second winding body is wound around the second winding axis by the second pole piece assembly Form; wherein, the outermost ring of the first pole piece assembly and the outermost ring of the second pole piece assembly are electrically connected, and the first winding body and the second winding body are arranged in the same layer , wherein at least one side of the first winding body is beyond the second winding body, so that a special-shaped cell structure is formed directly by winding, which effectively solves the complex process, limited structure, and transfer welding belt. risks of.
  • FIG. 1 is a schematic structural diagram of a cell assembly provided in Embodiment 1 of the application, wherein the cell assembly is in an “L” shape;
  • FIG. 2 is a schematic structural diagram of the pole piece assembly of the cell assembly shown in FIG. 1 , wherein the pole piece assembly is in an unfolded state;
  • FIG. 3 is a schematic cross-sectional view of a pole piece assembly of the cell assembly shown in FIG. 1;
  • FIG. 4 is a partial cross-sectional schematic view of the cell assembly shown in FIG. 1 , which mainly shows the structure of the connection assembly of the cell assembly;
  • FIG. 5 is a partial cross-sectional schematic diagram of the cell assembly shown in FIG. 1 in another implementation manner, which mainly shows the structure of the connection assembly of the cell assembly;
  • FIG. 6 is a schematic structural diagram of the battery core assembly shown in FIG. 1 from another perspective, which mainly shows the structures of the first winding body and the second winding body of the battery core assembly;
  • FIG. 7 is a schematic structural diagram of the cell assembly shown in FIG. 6 configured with a support plate
  • FIG. 8 is a schematic structural diagram of the cell assembly shown in FIG. 7 with the support plate removed;
  • FIG. 9 is a schematic structural diagram of the cell assembly shown in FIG. 7 configured with another support plate, wherein the edge of the support plate is provided with a warped portion;
  • FIG. 10 is a partial enlarged view of the battery core assembly shown in FIG. 6 , which mainly shows a state in which the first winding body and the second winding body of the battery core assembly are interlaced;
  • FIG. 11 is a schematic diagram of the geometry of the cell assembly shown in FIG. 10 , which mainly shows the geometric relationship between the first winding body and the second winding body of the cell assembly;
  • FIG. 12 is a schematic structural diagram of another implementation manner of the battery core assembly shown in FIG. 1 , which mainly shows that the first winding body and the second winding body of the battery core assembly can rotate with each other;
  • FIG. 13 is a schematic structural diagram of the cell assembly shown in FIG. 12 in another state
  • Figure 14 is a schematic structural diagram of the cell assembly shown in Figure 1 in another implementation, wherein the first winding body and the second winding body of the cell assembly are in the same direction;
  • FIG. 15 is a schematic structural diagram of a cell assembly provided in Embodiment 2 of the application, wherein the cell assembly is in an “L” shape, but the winding axes of the first winding body and the second winding body of the cell assembly are perpendicular;
  • FIG. 16 is a schematic structural diagram of the pole piece assembly of the cell assembly shown in FIG. 15 , wherein the pole piece assembly is in an unfolded state;
  • FIG. 17 is a schematic structural diagram of the cell assembly shown in FIG. 15 in another implementation manner, wherein the winding directions of the second winding body of the cell assembly are different;
  • FIG. 18 is a schematic structural diagram of a cell assembly provided in Embodiment 3 of the application, wherein the cell assembly is in a “T” shape;
  • FIG. 19 is a schematic structural diagram of the pole piece assembly of the cell assembly shown in FIG. 18 , wherein the pole piece assembly is in an unfolded state;
  • FIG. 20 is a schematic structural diagram of the cell assembly shown in FIG. 18 in another implementation manner; wherein the winding directions of the second winding body of the cell assembly are different;
  • FIG. 21 is a schematic structural diagram of the cell assembly provided in Embodiment 4 of the application, wherein the cell assembly is in a “T” shape;
  • FIG. 22 is a schematic structural diagram of the pole piece assembly of the cell assembly shown in FIG. 21 , wherein the pole piece assembly is in an unfolded state;
  • FIG. 23 is a schematic structural diagram of the cell assembly provided in Embodiment 5 of the application, wherein the cell assembly is in a “Z” shape;
  • FIG. 24 is a schematic structural diagram of the pole piece assembly of the cell assembly shown in FIG. 23 , wherein the pole piece assembly is in an unfolded state;
  • FIG. 25 is a schematic structural diagram of the cell assembly provided in Embodiment 6 of the application, wherein the cell assembly has a stepped structure;
  • Figure 26 is a schematic structural diagram of the pole piece assembly of the cell assembly shown in Figure 25, wherein the pole piece assembly is in an unfolded state;
  • FIGS. 27 to 30 are schematic structural diagrams of the electrochemical device provided in Example 7 of the application, wherein the electrochemical device has an "L” shape, a "T” shape, a “Z” shape and a stepped structure, respectively.
  • a cell assembly 100 is provided in Embodiment 1 of the application.
  • the cell assembly 100 includes a first winding body 10 and a second winding body 20 .
  • the first winding body 10 is connected to the second winding body 20 , at least one side of the first winding body 10 extends beyond the second winding body 20 , and the first winding body 10 and the second winding body 20 are arranged on the same layer. Special-shaped cell structure.
  • the two winding bodies are arranged on the same layer, that is, the winding bodies are all flat structures, the two larger surfaces of the winding body are the top surface and the bottom surface of the winding body, and one winding body is wound on the other.
  • the space between the plane where the top surface of the winding body is located and the plane where the bottom surface is located includes the case where the top or bottom surfaces of the two winding bodies are coplanar.
  • one side of the first winding body may be one side of the first winding body in its winding direction, that is, one end of the first winding body, or may be one side of the first winding body in the thickness direction .
  • the length direction of the first winding body 10 is set as L
  • the width direction of the first winding body 10 is set as W
  • the thickness direction of the first winding body 10 is set as H.
  • the second wound body 20 is located on the W direction side of the first wound body 10 .
  • the first winding body 10 has a first end portion and a second end portion, the first end portion and the second end portion are respectively two ends of the first winding body along the L direction, wherein the first end portion is in the L direction Beyond the second winding body 20 , the first winding body 10 and the second winding body 20 are arranged in the same layer to form a special-shaped cell structure.
  • the first winding body 10 and the second winding body 20 are arranged in the same layer in an "L"-shaped structure.
  • first winding body 10 and the second winding body 20 are not limited to be arranged in an "L"-shaped configuration.
  • the first winding body 10 and the second winding body 20 may also be arranged in the same layer in a “T” shape.
  • the first winding body 10 and the second winding body 20 may also be arranged in the same layer in a “Z” shape. As long as the first winding body 10 and the second winding body 20 can be arranged in the same layer with a special-shaped cell structure.
  • the dimension in the L direction of the first wound body 10 is different from the dimension in the L direction of the second wound body 20 .
  • the second end of the first winding body 10 is flush with the second winding body 20 along the L direction, so that the first winding body 10 and the second winding body 20 are arranged in the same layer to form an "L"-shaped configuration.
  • the size of the first winding body 10 in the W direction is different from that of the second winding body 20 in the W direction. Specifically, the size of the first winding body 10 in the W direction is larger than that of the second winding body 20 in the W direction. Dimensions in the W direction. According to the actual situation, the size of the first winding body 10 in the W direction may also be smaller than or equal to the size of the second winding body 20 in the W direction, which is not limited in this application.
  • the size of the first winding body 10 in the H direction is different from the size of the second winding body 20 in the H direction. Specifically, the size of the first winding body 10 in the H direction is larger than that of the second winding body 20 in the H direction.
  • the dimension in the H direction by arranging the distance between the first wound body 10 and the second wound body 20 in the W direction, can make the first wound body 10 and the second wound body 20 intersect in the W direction, Further, the size of the cell assembly 100 in the W direction is reduced, and the energy density of the cell assembly 100 is improved.
  • the size of the first winding body 10 in the H direction may also be smaller than or equal to the size of the second winding body 20 in the W direction, which is not limited in this application.
  • the first winding body 10 includes a first pole piece assembly 11 .
  • the first winding body 10 is formed by winding the first pole piece assembly 11 around a first winding axis O1 , and the first winding axis O1 is parallel to the L direction.
  • the second winding body 20 includes a second pole piece assembly 21 .
  • the second winding body 20 is formed by winding the second pole piece assembly 21 around a second winding axis O2, and the second winding axis O2 is parallel to the L direction.
  • the outermost ring of the first pole piece assembly 11 is connected to the outermost ring of the second pole piece assembly 21 .
  • the second winding axis O2 is not limited to be parallel to the L direction. As shown in FIG. 15 , the second winding axis O2 may also be parallel to the W direction. As long as the first winding body 10 and the second winding body 20 can be arranged in the same layer to form an "L"-shaped structure.
  • the winding direction of the first pole piece assembly 11 is opposite to that of the second pole piece assembly 12 .
  • the winding direction of the first pole piece assembly 11 is not limited to be the same as the winding direction of the second pole piece assembly 21 . As shown in FIG. 14 , the winding direction of the first pole piece assembly 11 may also be the same as the winding direction of the second pole piece assembly 21, which is not limited in this application.
  • the first pole piece assembly 11 and the second pole piece assembly 21 are respectively two parts of the same pole piece assembly 101, that is, the first pole piece assembly 11 and the second pole piece assembly 21 are integrally formed, and the unfolded pole piece assembly 101 is as follows. shown in Figure 2. Both the first winding body 10 and the second winding body 20 are formed by winding the pole piece assembly 101 .
  • the pole piece assembly 101 has a first end 1011 and a second end 1012 , the first end 1011 is located on the inner circle of the first pole piece assembly 11 , and the second end 1012 is located in the inner circle of the second pole piece assembly 21 .
  • the first pole piece assembly 11 and the second pole piece assembly 21 can be two independent pole piece assemblies, the first pole piece assembly 11 has a first end 1011 and a third end, the second pole piece The sheet assembly 11 has a second end 1012 and a fourth end.
  • the first end 1011 is located in the inner circle of the first pole piece assembly 11
  • the second end 1012 is located in the inner circle of the second pole piece assembly 21, and the third end is connected with the fourth end to form the first pole piece assembly 11 and the first pole piece assembly 11.
  • the third end and the fourth end may be connected together by welding.
  • the pole piece assembly 101 is basically in the shape of a strip extending along the W direction.
  • the second pole piece assembly 21 is located on one side of the first pole piece assembly 11 in the W direction, the first pole piece assembly 11 is flush with the second pole piece assembly 21 on one side in the L direction, and the first pole piece assembly 11 is at the L direction The other side of the direction is beyond the second pole piece assembly 21 .
  • the size of the first pole piece assembly 11 in the W direction is larger than the size of the second pole piece assembly 21 in the W direction, so that after the pole piece assembly 101 is wound to form the first winding body 10 and the second winding body 20,
  • the number of windings of the first winding body 10 is greater than the number of winding turns of the second winding body 20, so that the size of the first winding body 10 in the W direction is larger than the size of the second winding body 20 in the W direction.
  • size, and the size of the first wound body 10 in the H direction is larger than the size of the second wound body 20 in the H direction.
  • the process of winding the pole piece assembly 101 to form the first winding body 10 and the second winding body 20 is as follows:
  • the first end 1011 is wound toward the boundary in the W direction, and the first wound body 10 is formed when the first end 1011 is wound to the boundary.
  • the second end 1012 is wound in the W direction toward the boundary portion, and the second wound body 20 is formed when the second end 1012 is wound up to the boundary portion.
  • the first pole piece assembly 11 and the second pole piece assembly 21 both include a positive pole piece 110 , a negative pole piece 112 and a separator 114 .
  • the separator 114 is disposed between the positive electrode sheet 110 and the negative electrode sheet 112 to isolate the positive electrode sheet 110 and the negative electrode sheet 112 .
  • connection assembly 30 has a sheet-like structure as a whole, and the connection assembly 30 includes a first isolation membrane 31 , a first pole piece 32 , a second isolation membrane 33 and a second pole piece 34 .
  • first isolation film 31 , the first pole piece 32 , the second isolation film 33 and the second pole piece 34 are stacked in sequence .
  • the first pole piece 32 and the second pole piece assembly 34 are each other's cathode and anode, and are used to electrically connect the first pole piece assembly 11 and the second pole piece assembly 21 .
  • the first isolation film 31 is used to separate the inner ring of the first pole piece assembly 11 or the second pole piece assembly 21 from the first pole piece 32
  • the second isolation film 33 is used to separate the first pole piece 32 from the second pole piece 32.
  • Diodes 34 are spaced apart to avoid short circuits.
  • the structure of the connecting assembly 30 is not limited to the above-mentioned form.
  • the connecting assembly 30 includes a space-based material without active substances and an isolation membrane.
  • the first pole piece 32 is an anode pole piece
  • the second pole piece 34 is a cathode pole piece.
  • the anode pole piece is connected with the positive pole piece 110 of the first pole piece assembly 11 and the positive pole piece 110 of the second pole piece component 21 respectively
  • the cathode pole piece is respectively connected with the negative pole piece 112 of the second pole piece assembly 21 and the second pole piece assembly 21
  • the negative electrode sheet 112 is connected.
  • the first pole piece 32 can also be a cathode pole piece
  • the second pole piece 34 can also be an anode pole piece.
  • one of the first pole piece 32 and the second pole piece 34 is an anode pole piece, the other is a cathode pole piece.
  • Adhesive layers are provided on both sides of the first pole piece 32 .
  • the length of the adhesive layer should exceed 1.5 mm on both sides of the first pole piece 32 or the second pole piece 34, the specification of the adhesive layer can be 10 microns or 16 microns in thickness, and the width should exceed the factory size of the empty aluminum area.
  • the second pole piece 34 includes a first pole piece portion 340 and a second pole piece portion 342 .
  • a gap is formed between the first pole piece portion 340 and the second pole piece portion 342, which can be filled with a void-based material without active substances.
  • the first pole piece portion 340 is connected to the outermost ring of the first pole piece assembly 11
  • the second pole piece portion 342 is connected to the outermost ring of the second pole piece assembly 21 . With the above arrangement, the connection assembly 30 is not easy to precipitate lithium, and the safety performance is good.
  • the adhesive layer can be a green adhesive layer or a hot melt adhesive layer.
  • the first isolation film 31 and the second isolation film 33 may also adopt other structures.
  • the first pole piece 32 and the second pole piece 34 are provided with corresponding diaphragms, and the diaphragms may be active material layers. The details are as follows: both sides of the first pole piece 32 are coated with the first membrane 35 , and the side of the second pole piece 33 close to the first pole piece 32 is coated with the second membrane 36 .
  • the first diaphragm 35 may be a composite lithium material and graphite corresponding to the polarity of the first pole piece 32
  • the second diaphragm 36 may be a composite lithium material and graphite corresponding to the polarity of the second pole piece 34
  • the first diaphragm 35 and the second diaphragm 36 with the same coating weight as the cell can be used, so that no gap coating is required during the coating process, thereby reducing the yield loss, thereby reducing the process cost, and the first isolation film 31.
  • the thickness of the four layers of the first pole piece 32, the second isolation film 33 and the second pole piece 34 can be kept the same, so as to avoid problems such as deformation or discount of the pole piece caused by the inconsistent thickness.
  • the first pole piece assembly 11 includes a first arc surface portion 111 , a first plane portion 113 , a second arc surface portion 115 and a second plane portion 117 which are connected in sequence.
  • the first curved surface portion 111 is opposite to the second curved surface portion 115
  • the first flat surface portion 113 is opposite to the second flat surface portion 117 , and both are located between the first curved surface portion 111 and the second curved surface portion 115 .
  • the first arc surface portion 111 , the first plane portion 113 , the second arc surface portion 115 and the second plane portion 117 together form the outermost circle of the first pole piece assembly 11 .
  • the second pole piece assembly 21 includes a third arc portion 211 , a third plane portion 213 , a fourth arc portion 215 and a fourth plane portion 217 which are connected in sequence.
  • the third arc surface portion 211 is opposite to the fourth arc surface portion 215
  • the third plane portion 213 is opposite to the fourth plane portion 217 and both are located between the third arc surface portion 211 and the fourth arc surface portion 215 .
  • the third arc surface portion 211 , the third plane portion 213 , the fourth arc surface portion 215 and the fourth plane portion 217 together form the outermost circle of the second pole piece assembly 21 .
  • the second flat portion 117 and the fourth flat portion 217 are connected by a connecting member 30 , which is not shown in FIG. 6 .
  • the plane where the second plane portion 117 is located is the reference plane P, and the first pole piece assembly 11 and the second pole piece assembly 21 are both located on the same side of the reference plane P.
  • the fourth plane portion 217 is also located on the reference plane P, and the third plane portion 213 is located on one side of the reference plane P. As shown in FIG.
  • the cell assembly 100 further includes a support plate 40 .
  • the support plate 40 is coincident with the reference plane P, and the first pole piece assembly 11 and the second pole piece assembly 21 are arranged on the same side of the support plate 40 in the same layer.
  • the second flat portion 117 and the fourth flat portion 217 are in contact with the support plate 40 and fixed on the support plate 40 to fix the positions of the first pole piece assembly 11 and the second pole piece assembly 21 .
  • the support plate 40 may be a rigid material such as a plastic plate or a stainless steel plate. When the cell assembly is packaged into an electrochemical device, the support plate 40 is located inside the electrochemical device to enhance the rigidity of the cell assembly 100 .
  • the material used for the support plate 40 should have the following characteristics: anti-corrosion, anti-high temperature (not easy to age and deform in a temperature environment of 85 degrees Celsius), and high strength (the front can withstand a pressure of more than 2 MPa without breaking).
  • the support plate 40 can be formed of polycarbonate material, polypropylene, high-density polyethylene, nylon 66 or other materials that meet the requirements, or formed of stainless steel material such as 17-4PH stainless steel and 316L stainless steel.
  • the orthographic projections of the second plane portion 117 and the fourth plane portion 217 on the support plate 40 coincide with the outer contour of the support plate 40 , so that the weight, volume and cost of the support plate 40 can be controlled.
  • the second plane portion 117 and the fourth plane portion 217 may be fixed on the support plate 40 by means of gluing, or may be fixed on the support plate 40 by welding or other means according to the actual situation, which is not limited in this application.
  • the second plane portion 117 and the support plate 40 can be bonded by double-sided hot melt adhesive.
  • the area of the first adhesive region 41 between the second plane portion 117 and the support plate 40 should account for 30% of the area of the second plane portion 117 . According to the actual situation, the area of the first adhesive region 41 may be larger or smaller, as long as the area of the first adhesive region 41 accounts for 15% to 45% of the area of the second plane portion.
  • the fourth plane portion 217 and the support plate 40 can be bonded by hot melt adhesive, and the area of the second adhesive region 43 between the fourth plane portion 217 and the support plate 40 preferably accounts for 30% of the area of the fourth plane portion, According to actual conditions, the area of the second adhesive region 43 may be larger or smaller, as long as the area of the second adhesive region 43 accounts for 15% to 45% of the area of the fourth plane portion 217 .
  • a first warped portion 42 is formed on the edge of the support plate 40 close to the second arcuate portion 115 .
  • the curvature of the first curved portion 42 is adapted to the curvature of the second curved surface portion 115 , the first curved portion 42 at least partially covers the second curved surface portion 115 , and the first curved portion 42 is used to support the second curved surface portion 115 .
  • the arc surface portion 115 is used to further fix the first pole piece assembly 11 .
  • the first curved portion 42 and the second arcuate portion 115 can be fixed by the first side adhesive layer 44 .
  • the first curved portion 42 partially covers the second curved portion 115
  • the first side adhesive layer 44 covers the exposed portion of the second curved portion 115 and the first curved portion 42 , so as to separate the second curved portion 115 from the first curved portion 115 .
  • the bends 42 are secured together.
  • the first side adhesive layer 44 may be a hot melt adhesive layer or a green adhesive layer.
  • the edge of the support plate 40 close to the fourth arc surface portion 215 is formed with a second warped portion 46 .
  • the curvature of the second curved portion 46 is adapted to the fourth curved surface portion 215 , the second curved portion 46 at least partially covers the fourth curved surface portion 215 , and the second curved portion 46 is used to support the fourth curved surface portion 215 to further fix the second pole piece assembly 21 .
  • the second curved portion 46 and the fourth arcuate portion 215 can be fixed by the second side adhesive layer 48 .
  • the second curved portion 46 partially covers the fourth curved surface portion 215
  • the second side adhesive layer 48 covers the exposed portion of the fourth curved surface portion 215 and the second curved portion 46 , so as to separate the fourth curved surface portion 215 and the second curved surface portion 46 from each other.
  • the curved portions 46 are secured together.
  • the second side adhesive layer 48 may be a hot melt adhesive layer or a green adhesive layer.
  • first warped portion 42 and the second warped portion 46 may be omitted.
  • a gap 1110 is formed between the first arc surface portion 111 and the reference plane P.
  • the size of the first wound body 10 in the H direction is larger than the size of the second wound body 20 in the H direction, and by arranging the first wound body 10 and the second wound body 20 in the W direction distance, so that the second winding body 20 at least partially extends into the gap 1110, and the first winding body 10 and the second winding body 20 are staggered in the W direction, thereby reducing the distance between the cell assembly 100 in the W direction size, and improve the energy density of the cell assembly 100 .
  • the size of the first winding body 10 in the H direction can also be smaller than the size of the second winding body 20 in the H direction.
  • the gap 1110 can be configured by configuring the distance between the first winding body 10 and the second winding body 20 in the W direction, so that the first winding body 10 at least partially extends into the gap 1110, and the first winding body 10 and the The second winding bodies 20 are staggered in the W direction, thereby reducing the size of the cell assembly 100 in the W direction and improving the energy density of the cell assembly 100 .
  • the first winding body 10 and the second winding body 20 may at least partially protrude into the gap 1110 .
  • the first arc surface 111 is approximated as a first semicircular arc
  • the third arc surface 211 is approximated as a second semicircular arc
  • the first semicircular arc and the second semicircular arc are approximately tangent
  • the distance y at which the first winding body 10 and the second winding body 20 are staggered in the W direction can be calculated as follows.
  • first semicircle arc and the second semicircle arc be tangent to point D, make a straight line perpendicular to line segment BC at point D, and intersect at point E, and let the second semicircle arc and line segment BC intersect at point F.
  • the length of the line segment FE can be calculated from the similar triangles
  • R 1 is the diameter of the first semi-circular arc
  • R 2 is the diameter of the second semi-circular arc
  • the total energy added by the cell assembly 100 can be calculated
  • x is the staggered distance between the first winding body 10 and the second winding body 20 in the L direction
  • z is the staggered distance between the first winding body 10 and the second winding body 20 in the H direction
  • w is the energy density per unit volume.
  • x is equal to the dimension of the second winding body 20 in the L direction
  • y is equal to the dimension of the second winding body 20 in the H direction.
  • the thickness of the first jellyroll is twice or more than the thickness of the second jellyroll.
  • the distance between the first winding body 10 and the second winding body 20 in the W direction is not limited to making the first winding body 10 and the second winding body 20 staggered in the W direction, In some other embodiments, as shown in FIGS. 12 and 13 , the distance between the first winding body 10 and the second winding body 20 in the W direction is such that the first winding body 10 and the second winding body 20 are in phase with each other.
  • Dispersion that is, the size of the connecting member in the W direction makes the first winding body 10 and the second winding body 20 dispersed, and the connecting member 30 can be bent so that the first winding body 10 and the second winding body 20 20 can be mutually rotated around the L direction, which can be applied to electronic products with folding screens, and rotate with the folding of the screen.
  • a cell assembly 100a provided in Embodiment 2 of the present application is basically the same as the cell assembly provided in Embodiment 1, and the first winding body 10 and the second winding body 20 are also The arrangement on the same layer is in an "L" shape, and the main difference is that, in this embodiment, the second winding axis O2 is parallel to the W direction.
  • the winding direction of the first pole piece assembly 11 and the winding direction of the second pole piece assembly 21 are configured such that the connection assembly 30 coincides with the reference plane P. According to the actual situation, as shown in FIG. 17 , the first pole piece assembly
  • the winding direction of the 11 and the winding direction of the second pole piece assembly 21 may also be configured such that the connecting assembly 30 is inclined relative to the reference plane P, which is not limited in the present application.
  • the first winding body 10 is formed by winding the first pole piece assembly 11
  • the second winding body 20 is formed by winding the second pole piece assembly 21 .
  • the sheet assembly 21 After the sheet assembly 21 is unfolded, it basically takes the shape of an "L".
  • the second pole piece assembly 21 is located on one side of the first pole piece assembly 11 in the W direction, the first pole piece assembly 11 basically extends along the W direction, and the second pole piece assembly 21 basically extends along the L direction.
  • the first pole piece assembly 11 protrudes beyond the second pole piece assembly 21 on one side in the L direction, and the first pole piece assembly 11 is surpassed by the second pole piece assembly 21 on the other side in the L direction.
  • the first pole piece assembly 11 When the first pole piece assembly 11 is wound to form the first winding body 10 , the first pole piece assembly 11 is wound along the W direction toward the junction, and the first winding body 10 is formed when it is wound to the junction.
  • the second pole piece assembly 21 When the second pole piece assembly 21 is wound to form the second winding body 20 , the pole piece assembly 21 is wound along the L direction toward the junction, and the second winding body 20 is formed when it is wound to the junction.
  • a cell assembly 100b provided in Embodiment 3 of the present application is basically the same as the cell assembly provided in Embodiment 1, and the first end of the first winding body 10 extends beyond the second in the L direction.
  • the winding body 20, the main difference is that in this embodiment, the second end of the first winding body 10 extends beyond the second winding body 20 in the L direction, so that the first winding body 10 and the second winding body 10
  • the winding body 20 is arranged on the same layer in a "T" shape.
  • the second winding axis O2 is parallel to the L direction. According to the actual situation, the second winding axis is not limited to being parallel to the L direction. As shown in FIG. 20 , the second winding axis O2 can also be parallel to the W direction. As long as the first winding body 10 and the second winding body 20 can be arranged in the same layer to form a "T"-shaped structure.
  • the winding direction of the first winding body 10 is opposite to the winding direction of the second winding body 20, and the connecting component 30 is coincident with the reference plane P. According to the actual situation, as shown in FIG.
  • the winding direction may also be the same as the winding direction of the second winding body 20 , so that the connecting assembly 30 is inclined with respect to the reference plane P. As shown in FIG. This application is not limited.
  • the first winding body 10 is formed by winding the first pole piece assembly 11
  • the second winding body 20 is formed by winding the second pole piece assembly 21 .
  • the diode plate assembly 21 After the diode plate assembly 21 is unfolded, it is basically in the shape of a strip extending along the W direction.
  • the second pole piece assembly 21 is located on one side of the first pole piece assembly 11 in the W direction, and both sides of the first pole piece assembly 11 in the L direction exceed the second pole piece assembly 21 .
  • the first pole piece assembly 11 When the first pole piece assembly 11 is wound to form the first winding body 10 , the first pole piece assembly 11 is wound along the W direction toward the junction, and the first winding body 10 is formed when the first pole piece 11 is wound to the junction.
  • the second pole piece assembly 21 When the second pole piece assembly 21 is wound to form the second winding body 20 , the pole piece assembly 21 is wound along the W direction toward the junction, and the second winding body 20 is formed when it is wound to the junction.
  • a cell assembly 100c provided in Embodiment 4 of the present application is basically the same as the cell assembly provided in Embodiment 3.
  • the first winding body 10 and the second winding body 20 are arranged on the same layer as " The main difference is that, in this embodiment, the second winding axis O2 is parallel to the W direction.
  • the winding direction of the first winding body 10 and the winding direction of the second winding body 20 are configured so that the connecting assembly coincides with the reference plane P. According to the actual situation, the winding direction of the first winding body and the second winding body are The winding direction of the winding body may also be configured such that the connecting assembly is inclined relative to the reference plane. This application is not limited.
  • the first winding body 10 is formed by winding the first pole piece assembly 11
  • the second winding body 20 is formed by winding the second pole piece assembly 21
  • the first pole piece assembly 11 and the second pole piece form an "L" shape.
  • the second pole piece assembly 21 is located on one side of the first pole piece assembly 11 in the W direction
  • the first pole piece assembly 11 extends along the W direction
  • the second pole piece assembly 21 extends along the L direction.
  • the first pole piece assembly 11 protrudes beyond the second pole piece assembly 21 on one side in the L direction, and the first pole piece assembly 11 is surpassed by the second pole piece assembly 21 on the other side in the L direction.
  • the first pole piece assembly 11 When the first pole piece assembly 11 is wound to form the first winding body 10 , the first pole piece assembly 11 is wound along the W direction toward the junction, and the first winding body 10 is formed when it is wound to the junction.
  • the second pole piece assembly 21 When the second pole piece assembly 21 is wound to form the second winding body 20 , the pole piece assembly 21 is wound along the L direction toward the junction, and the second winding body 20 is formed when it is wound to the junction.
  • a cell assembly 100d provided in Embodiment 5 of the present application is basically the same as the cell assembly provided in Embodiment 1, and the first end of the first winding body 10 extends beyond the second in the L direction.
  • the main difference between the winding body 20 is that, in this embodiment, the second winding body 20 extends beyond the second end of the first winding body 10 in the L direction, so that the first winding body 10 and the second winding body 10
  • the winding body 20 is arranged on the same layer in a "Z" shape.
  • the dimension of the first winding body 10 in the L direction may be the same as or different from the dimension of the second winding body 20 in the L direction, which is not limited in the present application.
  • the second winding axis is parallel to the L direction.
  • the first winding body 10 is formed by winding the first pole piece assembly 11
  • the second winding body 20 is formed by winding the second pole piece assembly 21 .
  • the first pole piece assembly 11 and the second pole piece assembly 21 are substantially strip-shaped extending along the W direction.
  • the second pole piece assembly 21 is located on one side of the first pole piece assembly 11 in the W direction, the first pole piece assembly 11 extends beyond the second pole piece assembly 21 on one side in the L direction, and the first pole piece assembly 11 is in the L direction. The other side is overtaken by the second pole piece assembly 21 .
  • the first pole piece assembly 11 When the first pole piece assembly 11 is wound to form the first winding body 10 , the first pole piece assembly 11 is wound along the W direction toward the junction, and the first winding body 10 is formed when the first pole piece 11 is wound to the junction.
  • the second pole piece assembly 21 When the second pole piece assembly 21 is wound to form the second winding body 20 , the pole piece assembly 21 is wound along the W direction toward the junction, and the second winding body 20 is formed when it is wound to the junction.
  • a cell assembly 100e provided in Embodiment 5 of the present application is basically the same as the cell assembly provided in Embodiment 1.
  • the main difference is that in this embodiment, the first winding body 10 Both the first end and the second end are flush with the second winding body 20 in the L direction, and the thickness of the first winding body 10 is greater than that of the second winding body 20, that is, the first winding body 10 is at One side in the W direction extends beyond the second winding body 20 , so that the first winding body 10 and the second winding body 20 are arranged in the same layer in a stepped configuration.
  • the winding direction of the first pole piece assembly 11 is opposite to that of the second pole piece assembly 21. According to actual needs, the winding direction of the first pole piece assembly 11 can also be the same as the winding direction of the second pole piece assembly 21. Similarly, this application is not limited.
  • the first winding body 10 is formed by winding the first pole piece assembly 11
  • the second winding body 20 is formed by winding the second pole piece assembly 21
  • the first pole piece assembly 11 and the second pole piece After the plate assembly 21 is unfolded, it is basically in the shape of a strip extending along the L direction, wherein the size of the first pole piece assembly 11 in the L direction is larger than that of the second pole piece assembly 21 in the L direction.
  • Embodiment 7 of the present application provides an electrochemical device 200 including the cell assembly described in any one of Embodiments 1 to 6.
  • electrochemical device 200 is a battery.
  • the electrochemical device 200 when the cell assembly of the electrochemical device 200 is the cell assembly 100 provided in Example 1 or the cell assembly provided in Example 2, the electrochemical device 200 is in an “L” shape plate structure.
  • the electrochemical device 200 when the cell assembly of the electrochemical device 200 is the cell assembly provided in Example 3 or the cell assembly 100c provided in Example 4, the electrochemical device 200 has a “T” shape Shaped plate structure.
  • the electrochemical device 200 when the cell assembly of the electrochemical device 200 is the cell assembly provided in Example 5, the electrochemical device 200 has a "Z"-shaped plate-like structure.
  • the electrochemical device 200 when the cell assembly of the electrochemical device 200 is the cell assembly provided in Example 6, the electrochemical device 200 has a stepped structure.
  • Electrochemical device 200 also includes tabs.
  • the tabs are arranged on the first winding body 10 or the second winding body 20 .
  • the first winding body and the second winding body are arranged in the same layer, wherein at least one side of the first winding body Beyond the second winding body, a special-shaped cell structure is directly formed by winding, which effectively solves the risks brought about by complex process, limited structure and transfer welding.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)

Abstract

La présente demande appartient au domaine technique des dispositifs électrochimiques et porte sur un ensemble cellule et un dispositif électrochimique. L'ensemble cellule comprend : un premier corps d'enroulement comprenant un premier composant de plaque d'électrode, le premier corps d'enroulement étant formé par enroulement du premier composant de plaque d'électrode autour d'un premier axe d'enroulement ; et un second corps d'enroulement comprenant un second composant de plaque d'électrode, le second corps d'enroulement étant formé par enroulement du second composant de plaque d'électrode autour d'un second axe d'enroulement. La bague externe du premier composant de plaque d'électrode et la bague externe du second composant de plaque d'électrode sont électriquement connectées, le premier corps d'enroulement et le second corps d'enroulement étant disposés dans la même couche, et au moins un côté du premier corps d'enroulement s'étendant au-delà du second corps d'enroulement. Cette configuration permet de former directement une structure de cellule de forme spéciale par enroulement, ce qui permet de résoudre efficacement les problèmes de processus complexes, de limitations structurales et de risques liés au brasage.
PCT/CN2020/113062 2020-09-02 2020-09-02 Ensemble cellule et dispositif électrochimique WO2022047674A1 (fr)

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CN202080074371.8A CN114631211B (zh) 2020-09-02 2020-09-02 一种电芯组件及电化学装置

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