CN220585257U - Composite pole piece, winding core structure, battery and electricity utilization device - Google Patents
Composite pole piece, winding core structure, battery and electricity utilization device Download PDFInfo
- Publication number
- CN220585257U CN220585257U CN202321956353.XU CN202321956353U CN220585257U CN 220585257 U CN220585257 U CN 220585257U CN 202321956353 U CN202321956353 U CN 202321956353U CN 220585257 U CN220585257 U CN 220585257U
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- positive electrode
- negative electrode
- pole piece
- electrode layer
- diaphragm
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- 238000004804 winding Methods 0.000 title claims abstract description 36
- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 230000005611 electricity Effects 0.000 title description 2
- 238000005452 bending Methods 0.000 claims description 17
- 239000012528 membrane Substances 0.000 claims description 6
- 238000007747 plating Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000007773 negative electrode material Substances 0.000 claims description 3
- 239000007774 positive electrode material Substances 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052744 lithium Inorganic materials 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 5
- 210000004027 cell Anatomy 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
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- Secondary Cells (AREA)
Abstract
The application relates to the field of secondary batteries, in particular to a composite pole piece, a winding core structure, a battery and an electric device. The composite pole piece comprises a first diaphragm, an anode layer and a cathode layer; the positive electrode layer and the negative electrode layer are respectively positioned at two sides of the first diaphragm; the positive electrode layer comprises a plurality of positive electrode sections, and the positive electrode sections are arranged at intervals along the length direction of the first diaphragm so as to form a first blank section between two adjacent positive electrode sections; the negative electrode layer comprises a plurality of negative electrode sections, and the plurality of negative electrode sections are arranged at intervals along the length direction of the first diaphragm so as to form a second blank section between two adjacent negative electrode sections; the positive pole section and the negative pole section are correspondingly arranged. The utility model provides a compound pole piece sets up the blank section through the kink at the core of rolling up to make this position department can not produce the problem of lithium analysis, and the kink of roll up the core only has one deck first diaphragm, and the material layer number is few, the degree of difficulty of buckling is low, can not form the great turning of radian of buckling, is favorable to rolling up the miniaturization of core volume, can promote the holistic energy density of electric core.
Description
Technical Field
The application relates to the field of batteries, in particular to a composite pole piece, a winding core structure, a battery and an electric device.
Background
The production process of the secondary battery can be roughly divided into a front-stage process (pole piece manufacturing), a middle-stage process (cell synthesis) and a back-stage process (formation and encapsulation). Winding the cells is an extremely important loop in the middle stage process. In the winding process, a first diaphragm is arranged between the positive electrode and the negative electrode of the battery so as to separate the positive electrode from the negative electrode of the battery, thereby achieving the purposes of blocking insulation and preventing the contact of the two electrodes from short circuit.
The coiled battery cell comprises a straight line part positioned in the middle and a bending part positioned at the edge, and the straight line part and the bending part are covered by the positive electrode plate and the negative electrode plate. The pole piece of kink is by the easy lithium analysis of kink effect, and the number of piles of kink material is more, and the difficulty of buckling is big, causes this department volume to increase, and then has reduced the holistic energy density of electric core.
Disclosure of Invention
The utility model provides a compound pole piece, roll up core structure, battery and power consumption device can avoid the kink of roll up the core to gather out lithium when convoluteing, can also reduce the degree of difficulty of coiling buckling, promotes the holistic energy density of roll up the core.
The application provides a composite pole piece, which comprises a first diaphragm, an anode layer and a cathode layer;
the positive electrode layer and the negative electrode layer are respectively positioned at two sides of the first diaphragm;
the positive electrode layer comprises a plurality of positive electrode sections, and the positive electrode sections are arranged at intervals along the length direction of the first diaphragm so as to form a first blank section between two adjacent positive electrode sections;
the negative electrode layer comprises a plurality of negative electrode sections, and the plurality of negative electrode sections are arranged at intervals along the length direction of the first diaphragm so as to form a second blank section between two adjacent negative electrode sections;
the positive pole section and the negative pole section are correspondingly arranged.
In the above technical solution, further, the edge of the negative electrode segment correspondingly disposed exceeds the edge of the positive electrode segment.
In the above technical solution, further, in the width direction of the first separator, an edge of the first separator exceeds an edge of the negative electrode segment by a first preset distance, and an edge of the negative electrode segment exceeds an edge of the positive electrode segment by a second preset distance.
In the above technical solution, further, in the length direction of the first diaphragm, the length of the first blank section is greater than the length of the second blank section by a third preset distance.
In the above technical solution, further, the first preset distance is between 0mm and 5 mm;
the second preset distance is between 0mm and 5 mm;
the third preset distance is between 1cm and 10 cm.
In the above technical solution, further, the positive electrode layer includes a positive electrode current collector and a positive electrode active material coated on a surface of the positive electrode current collector;
the negative electrode layer comprises a negative electrode current collector and a negative electrode active material coated on the surface of the negative electrode current collector;
the positive current collector is an aluminum plating layer formed on one side of the first diaphragm;
the negative current collector is a copper plating layer formed on the other side of the first diaphragm.
The application also provides a winding core structure, which comprises the composite pole piece in the scheme;
the composite pole piece is spirally wound to form a straight line part and bending parts positioned at two ends of the straight line part;
the positive electrode section and the negative electrode section are located at the straight line portion, and the first blank section and the second blank section are located at the bending portion.
In the above technical solution, further, the positive electrode layer is located inside the first separator, and the negative electrode layer is located outside the first separator.
In the above technical solution, further, the device further includes a second membrane;
the second diaphragm is positioned on the inner side of the composite pole piece and is wound in the same direction with the composite pole piece; and the second diaphragm is in fit connection with the positive electrode layer of the composite pole piece so as to isolate the positive electrode layer and the negative electrode layer of the winding core structure.
The application also provides a battery, which comprises the winding core structure.
The application also provides an electric device which comprises the battery.
Compared with the prior art, the beneficial effects of this application are:
the utility model provides a compound pole piece sets up the blank section through the kink at the core of rolling up to make this position department can not produce the problem of lithium analysis, and the kink of roll up the core only has one deck first diaphragm, and the material layer number is few, the degree of difficulty of buckling is low, can not form the great turning of radian of buckling, is favorable to rolling up the miniaturization of core volume, can promote the holistic energy density of electric core.
The application also provides a winding core structure, which comprises the composite pole piece. Based on the above analysis, the winding core structure has the same advantages and is not described herein.
The application also provides a battery, which comprises the winding core structure. Based on the above analysis, the battery has the same advantages as described above, and will not be described in detail herein.
The application also provides an electric device comprising the battery. Based on the above analysis, the power consumption device has the same beneficial effects and will not be described herein.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a first schematic structural diagram of a composite pole piece provided in the present application;
fig. 2 is a second schematic structural diagram of the composite pole piece provided in the present application;
FIG. 3 is a schematic view of an assembled position of a composite pole piece and a second diaphragm provided herein;
fig. 4 is a schematic structural diagram of a winding core structure provided in the present application.
In the figure: 101-a first separator; 102-a positive electrode layer; 103-a negative electrode layer; 104-a positive pole section; 105-a first blank section; 106-a negative electrode section; 107-second blank section; 108-straight line part; 109-a bend; 110-a second separator.
Detailed Description
The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically 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.
Example 1
Referring to fig. 1 to 4, the composite electrode sheet provided herein includes a first separator 101, a positive electrode layer 102, and a negative electrode layer 103. The positive electrode layer 102 and the negative electrode layer 103 are located on both sides of the first separator 101, respectively. The first separator 101 is used for separating the positive electrode layer 102 from the negative electrode layer 103 of the battery, so as to achieve the purpose of blocking and insulating, and prevent the problem of short circuit caused by contact between the positive electrode layer 102 and the negative electrode layer 103.
Specifically, the positive electrode layer 102 includes a plurality of positive electrode segments 104, and the plurality of positive electrode segments 104 are disposed at intervals along the length direction of the first separator 101 to form a first blank segment 105 between adjacent two positive electrode segments 104. Correspondingly, the anode layer 103 includes a plurality of anode segments 106, and the plurality of anode segments 106 are disposed at intervals along the length direction of the first separator 101 to form a second blank segment 107 between two adjacent anode segments 106. On both sides of the first separator 101, the positive electrode segment 104 and the negative electrode segment 106 are provided correspondingly, and similarly, the positions of the first margin 105 and the second margin 107 are provided correspondingly.
In the process of winding the composite pole piece into a winding core, a length metering mechanism is arranged on the unreeling mechanism of the first diaphragm 101. According to the size of the winding core to be finally obtained, the length of the straight line segment of each circle of the winding core can be calculated through a length counting mechanism, and the positive electrode segment 104 and the negative electrode segment 106 are arranged at the corresponding positions of the straight line segment; according to the calculated length of the bending portion 109 of each turn of the winding core, a blank diaphragm (corresponding to the first blank section 105 and the second blank section 107 respectively arranged at both sides of the first diaphragm 101) is left at a position corresponding to the bending portion 109, and the blank diaphragm corresponds to the arc-shaped corner of the winding core when winding. The winding core is obtained by winding, so that the length of the outer corner membrane is sequentially increased compared with that of the inner corner membrane.
Because the bending part 109 of the winding core is not provided with an electrode layer, the problem of lithium precipitation cannot occur at the position, and the bending part 109 of the winding core only has the first diaphragm 101, so that the number of material layers is small, the bending difficulty is low, the corner with larger bending radian cannot be formed, the miniaturization of the volume of the winding core is facilitated, and the overall energy density of the battery core can be improved.
In an alternative to this embodiment, the edges of the correspondingly arranged negative electrode segments 106 extend beyond the edges of the positive electrode segments 104.
In the process of designing a battery, if the negative electrode does not receive lithium ions, the lithium ions can be separated out on the surface of the negative electrode to form lithium dendrites, and the lithium dendrites penetrate through a diaphragm to cause short circuit in the battery and cause thermal runaway. In this embodiment, the present application provides that the negative electrode segment 106 has an area margin in both the length and width directions, ensuring that the anode of the cell is coated with the cathode, to avoid such situations.
Referring to fig. 2, alternatively, in the width direction (direction B shown in fig. 2) of the first separator 101, the edge of the first separator 101 exceeds the edge of the negative electrode segment 106 by a first preset distance, and the edge of the negative electrode segment 106 exceeds the edge of the positive electrode segment 104 by a second preset distance.
Specifically, the first preset distance (corresponding to b in fig. 2) is between 0mm and 5mm. Preferably, the first preset distance is 2.5mm. The second preset distance (corresponding to a in fig. 2) is between 0mm and 5mm. Preferably, the second preset distance is 2.5mm.
Alternatively, in the longitudinal direction (a direction shown in fig. 1) of the first diaphragm 101, the length of the first margin 105 is greater than the length of the second margin 107 by a third preset distance.
Specifically, the third preset distance is between 1cm and 10 cm. Preferably, the third preset distance is 5cm.
In this embodiment, the present application provides the negative electrode segment 106 with the above margin in the length and width directions, and the problem of reducing the battery energy density due to the excessive margin area is not caused while ensuring the lithium separation safety.
In an alternative version of this embodiment, the positive electrode layer 102 includes a positive electrode current collector and a positive electrode active material coated on the surface of the positive electrode current collector; the positive electrode current collector is an aluminum plating layer formed on one side of the first separator 101. The negative electrode layer 103 includes a negative electrode current collector and a negative electrode active material coated on a surface of the negative electrode current collector; the negative electrode current collector is a copper plating layer formed on the other side of the first separator 101.
Example two
Referring to fig. 4, a second embodiment of the present application provides a winding core structure, which includes the composite pole piece of any one of the above embodiments, and the composite pole piece is spirally wound to form a straight portion 108 and bending portions 109 located at two ends of the straight portion 108. The positive electrode layer 102 is located on the inner side of the first separator 101, the negative electrode layer 103 is located on the outer side of the first separator 101, and the wound roll core has a structure in which the negative electrode layer 103 surrounds the positive electrode layer 102.
Further, the positive electrode segment 104 and the negative electrode segment 106 are located at the straight line portion 108, and the first blank segment 105 and the second blank segment 107 are located at the bent portion 109.
In this embodiment, since the electrode layer is not disposed at the bending portion 109 of the winding core, the problem of lithium precipitation cannot occur at the position, and the bending portion 109 of the winding core has only one layer of the first membrane 101, the number of material layers is small, the bending difficulty is low, and the corner with larger bending radian cannot be formed, which is beneficial to miniaturization of the volume of the winding core, and the overall energy density of the battery core can be improved.
Referring to fig. 3 and 4, in an alternative to this embodiment, the winding core structure further includes a second diaphragm 110; the second separator 110 is positioned at the inner side of the composite pole piece to be wound in the same direction as the composite pole piece. Specifically, the second diaphragm 110 is attached to the positive electrode layer 102 of the composite pole piece, and when the composite pole piece is wound, the second diaphragm 110 can isolate the positive electrode layer 102 connected with the diaphragm from the negative electrode layer 103 of the inner ring, so that the problem of short circuit caused by contact between the positive electrode layer 102 and the negative electrode layer 103 is avoided.
Example III
The third embodiment of the present application provides a battery, including the winding core structure of the foregoing embodiment, so that the battery has all the beneficial technical effects of the winding core structure of the foregoing embodiment, and is not described herein again.
Example IV
The fourth embodiment of the present application provides an electric device, which includes the battery of the foregoing embodiment, so that the electric device has all the beneficial technical effects of the battery of the foregoing embodiment, and is not described herein again.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application. Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the present application and form different embodiments.
Claims (11)
1. The composite pole piece is characterized by comprising a first diaphragm (101), a positive electrode layer (102) and a negative electrode layer (103);
the positive electrode layer (102) and the negative electrode layer (103) are respectively positioned on two sides of the first diaphragm (101);
the positive electrode layer (102) comprises a plurality of positive electrode sections (104), and the positive electrode sections (104) are arranged at intervals along the length direction of the first diaphragm (101) so as to form a first blank section (105) between two adjacent positive electrode sections (104);
the negative electrode layer (103) comprises a plurality of negative electrode sections (106), and the plurality of negative electrode sections (106) are arranged at intervals along the length direction of the first diaphragm (101) so as to form a second blank section (107) between two adjacent negative electrode sections (106);
the positive electrode section (104) and the negative electrode section (106) are correspondingly arranged.
2. The composite pole piece of claim 1, wherein the edges of the correspondingly disposed negative pole segments (106) extend beyond the edges of the positive pole segments (104).
3. The composite pole piece according to claim 2, characterized in that, in the width direction of the first separator (101), the edge of the first separator (101) exceeds the edge of the negative pole segment (106) by a first preset distance, and the edge of the negative pole segment (106) exceeds the edge of the positive pole segment (104) by a second preset distance.
4. A composite pole piece according to claim 3, characterized in that the length of the first blank section (105) is greater than the length of the second blank section (107) by a third preset distance in the length direction of the first membrane (101).
5. The composite pole piece of claim 4, wherein the first predetermined distance is between 0mm and 5 mm;
the second preset distance is between 0mm and 5 mm;
the third preset distance is between 1cm and 10 cm.
6. The composite pole piece of claim 1, wherein the positive electrode layer (102) comprises a positive electrode current collector and a positive electrode active material coated on a surface of the positive electrode current collector;
the negative electrode layer (103) comprises a negative electrode current collector and a negative electrode active material coated on the surface of the negative electrode current collector;
the positive electrode current collector is an aluminum plating layer formed on one side of the first diaphragm (101);
the negative electrode current collector is a copper plating layer formed on the other side of the first separator (101).
7. A winding core structure comprising a composite pole piece according to any one of claims 1 to 6;
the composite pole piece is spirally wound to form a straight line part (108) and bending parts (109) positioned at two ends of the straight line part (108);
the positive electrode section (104) and the negative electrode section (106) are located at the straight line portion (108), and the first blank section (105) and the second blank section (107) are located at the bending portion (109).
8. The winding core structure according to claim 7, characterized in that the positive electrode layer (102) is located inside the first separator (101) and the negative electrode layer (103) is located outside the first separator (101).
9. The winding core structure according to claim 8, further comprising a second membrane (110);
the second diaphragm (110) is positioned on the inner side of the composite pole piece and is wound in the same direction with the composite pole piece; and the second diaphragm (110) is in fit connection with the positive electrode layer (102) of the composite pole piece so as to isolate the positive electrode layer (102) and the negative electrode layer (103) of the winding core structure.
10. A battery comprising a jellyroll structure according to any of claims 7-9.
11. An electrical device comprising the battery of claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321956353.XU CN220585257U (en) | 2023-07-24 | 2023-07-24 | Composite pole piece, winding core structure, battery and electricity utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321956353.XU CN220585257U (en) | 2023-07-24 | 2023-07-24 | Composite pole piece, winding core structure, battery and electricity utilization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220585257U true CN220585257U (en) | 2024-03-12 |
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ID=90114959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321956353.XU Active CN220585257U (en) | 2023-07-24 | 2023-07-24 | Composite pole piece, winding core structure, battery and electricity utilization device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220585257U (en) |
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2023
- 2023-07-24 CN CN202321956353.XU patent/CN220585257U/en active Active
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