CN220065767U - Button type lithium ion battery - Google Patents
Button type lithium ion battery Download PDFInfo
- Publication number
- CN220065767U CN220065767U CN202320550235.2U CN202320550235U CN220065767U CN 220065767 U CN220065767 U CN 220065767U CN 202320550235 U CN202320550235 U CN 202320550235U CN 220065767 U CN220065767 U CN 220065767U
- Authority
- CN
- China
- Prior art keywords
- battery
- lithium ion
- button
- battery cell
- type lithium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 26
- 238000004804 winding Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- 239000003273 ketjen black Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FBDMJGHBCPNRGF-UHFFFAOYSA-M [OH-].[Li+].[O-2].[Mn+2] Chemical compound [OH-].[Li+].[O-2].[Mn+2] FBDMJGHBCPNRGF-UHFFFAOYSA-M 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model discloses a button type lithium ion battery, which comprises a battery cell group and a shell, wherein the battery cell group comprises a plurality of battery cells connected in parallel, the battery cells comprise square battery cells positioned in the center and at least one cylindrical battery cell arranged on the corresponding outer side surface of the square battery cells, and the axial direction of the cylindrical battery cells is perpendicular to the corresponding outer side surface of the square battery cells; the battery cell group is accommodated in the shell. The utility model can improve the utilization rate of the internal space of the battery and further improve the volume energy density of the battery.
Description
Technical Field
The utility model relates to a button type lithium ion battery, and belongs to the technical field of lithium ion batteries.
Background
At present, along with the rapid development of global informatization, in the field of consumer electronics microminiature batteries, the requirements of people on battery performance are continuously improved, from a lead-acid battery to a manganese dioxide lithium battery, to a current rechargeable lithium ion battery, the battery technology is stable and rapidly developed, but on the premise of fixed type of button battery, the difficulty of improving the volume energy density is abnormal. The existing button battery has the defects that the volume energy density is generally low and is between 130Wh/L and 165Wh/L, and is mainly because after the battery core is wound, the battery core is in a cuboid shape through hot pressing treatment, the outer shell of the button battery is round, and great space waste occurs after the battery core is put into the shell, so that the volume energy density of the battery core is very low.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a button type lithium ion battery which can improve the utilization rate of the internal space of the battery and further improve the volume energy density of the battery.
In order to solve the technical problems, the technical scheme of the utility model is as follows: a button lithium ion battery comprising:
the battery cell group comprises a plurality of battery cells connected in parallel, wherein the battery cells comprise square battery cells positioned in the center and at least one cylindrical battery cell arranged on the corresponding outer side surface of the square battery cells, and the axial direction of the cylindrical battery cells is perpendicular to the corresponding outer side surface of the square battery cells;
and the battery cell group is accommodated in the shell.
Further, the battery cell comprises at least one positive plate, at least one negative plate and a diaphragm for separating the positive plate and the negative plate.
Further, the cylindrical battery cells are provided with four, the four cylindrical battery cells are respectively arranged on four outer side surfaces of the square battery cells, and two surfaces of the square battery cells in the axial direction of the shell are a top surface and a bottom surface.
Further, the square battery cell is electrically connected with the positive electrode lug of the cylindrical battery cell;
the square battery cell is electrically connected with the negative electrode lug of the cylindrical battery cell.
Further, the positive electrode lugs are electrically connected with the positive electrode of the shell after being electrically connected together;
the negative electrode lugs are electrically connected with the negative electrode of the shell after being electrically connected together.
Further, in order to better improve the utilization rate of the inner space, the cross section of the shell is round, and the cross section of the square battery cell is inscribed in the cross section of the shell.
Further, in order to better improve the utilization rate of the inner space, the corresponding outer side surface of the square battery cell and the outer shell enclose a filling space, and the axial longitudinal section of the cylindrical battery cell is inscribed in the cross section of the corresponding filling space.
Further, the battery cell is a winding type battery cell or a stacked type battery cell.
After the technical scheme is adopted, the problem of low space utilization rate is solved by adopting a mode of connecting multiple electric cores in parallel, specifically, at least one cylindrical electric core is connected with 1 square electric core in parallel, and then the cylindrical electric core is filled into the shell, so that gaps between the square electric cores and the shell can be well filled; specifically, the square battery core is inscribed in the shell, the square battery core and the edge of the shell are inscribed with the cylindrical battery core, the square battery core and the cylindrical battery core are manufactured independently, after the battery core is manufactured, the cylindrical battery core and the positive electrode lug of the square battery core are welded with the positive electrode lug and the negative electrode lug, after the welding is finished, the positive electrode lug and the negative electrode lug are respectively welded on the positive electrode lug and the negative electrode lug of the shell in a spot welding way, in order to further improve the utilization rate of the internal space of the battery core, 4 small cylindrical battery cores are connected between the square battery core and the shell in parallel, the volume utilization rate of the battery core can be improved by more than 25 percent, and the LIR2032 button battery is taken as an example, the volume energy density of only one square battery core is only 130Wh/L-165Wh/L under the same model, and the volume energy density of the battery connected by multiple battery cores in parallel can be improved to more than 200 Wh/L.
Drawings
Fig. 1 is a schematic structural view of a button type lithium ion battery of the present utility model.
Detailed Description
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1, a button type lithium ion battery includes:
a housing 3;
the battery cell group is accommodated in the shell 3, and comprises a plurality of parallel battery cells, wherein each battery cell comprises a square battery cell 1 positioned in the center and four cylindrical battery cells 2 arranged on the corresponding outer side surfaces of the square battery cells 1, and the axial direction of each cylindrical battery cell 2 is perpendicular to the corresponding outer side surfaces of the square battery cells 1.
In this embodiment, the number of the cylindrical battery cells 2 can be specifically selected according to the requirement.
Specifically, the battery cell comprises at least one positive plate, at least one negative plate and a diaphragm for separating the positive plate from the negative plate. In this embodiment, the battery cell is a winding type battery cell, and of course, it may also be a stacked type battery cell, where winding type and stacked type battery cells are well known in the art, and detailed description is omitted in this embodiment.
In this embodiment, two surfaces of the square battery cell in the axial direction of the housing 3 are a top surface and a bottom surface, the cylindrical battery cell 2 may not be disposed on the top surface and the bottom surface, and the remaining four surfaces are the four outer side surfaces in this embodiment.
Specifically, in this embodiment, the square battery cell 1 and the positive electrode tab of the cylindrical battery cell 2 are electrically connected together and then electrically connected with the positive electrode of the housing 3;
the square battery cell 1 and the cathode lug of the cylindrical battery cell 2 are electrically connected together and then electrically connected with the cathode of the shell 3.
Specifically, as shown in fig. 1, the cross section of the housing 3 is circular, the cross section of the square battery cell 1 can be inscribed in the cross section of the housing 3, the corresponding outer side surface of the square battery cell 1 and the housing 3 enclose a filling space, and the axial longitudinal section of the cylindrical battery cell 2 can be inscribed in the cross section of the corresponding filling space, so as to achieve the maximum space utilization.
The embodiment adopts a mode of connecting multiple electric cores in parallel to solve the problem of low space utilization rate, specifically, at least one cylindrical electric core 2 is connected with one square electric core 1 in parallel, and then the square electric core is arranged in the shell 3, so that gaps between the square electric core 1 and the shell 3 can be well filled; specifically, the square battery cell 1 is inscribed in the shell 3, the square battery cell 1 and the shell 3 are inscribed with the cylindrical battery cell 2 again, the square battery cell 1 and the cylindrical battery cell 2 are manufactured independently, after the battery cell manufacturing is completed, the positive electrode tab pair positive electrode tab and the negative electrode tab pair negative electrode tab of the cylindrical battery cell 1 and the square battery cell 2 are welded, and after the welding is completed, the positive electrode tab and the negative electrode tab are respectively spot-welded on the positive electrode and the negative electrode of the shell.
In this embodiment, the specific manufacturing process may be as follows:
1. preparation of a positive plate:
preparing a mixed glue solution of a binder and a solvent by adopting a stirring process, wherein the content of the binder accounts for 1-8%;
adding a conductive agent (including but not limited to carbon nano tubes, ketjen black, acetylene, super p, ks6, graphene and the like) and a positive electrode material into the mixed solution obtained in the step (1), wherein the content of the conductive agent accounts for 1-8%, and uniformly dispersing by adopting a stirring process to obtain a slurry dispersion suitable for coating;
uniformly coating the slurry dispersion liquid obtained in the step (2) on a current collector (the current collector comprises but is not limited to foam nickel, photo-aluminum foil and corrosion aluminum foil) to obtain a positive plate with proper surface density for later use;
2. preparing a negative plate:
(10) Preparing a mixed glue solution of a binder and a solvent by adopting a stirring process, wherein the content of the binder accounts for 1-6%;
(20) Adding a conductive agent (including but not limited to carbon nano tubes, ketjen black, acetylene, super p, ks6, graphene and the like) into the mixed glue solution obtained in the step (10), wherein the negative electrode material includes but not limited to artificial graphite, natural graphite, mesophase carbon microspheres, hard carbon, soft carbon and the like, the content of the conductive agent accounts for 1-6%, and uniformly dispersing by adopting a stirring or ball milling process to obtain a slurry dispersion suitable for coating;
(30) Uniformly coating the slurry dispersion liquid obtained in the step (20) on a current collector (the current collector comprises but is not limited to foam nickel, photo-aluminum foil, corrosion aluminum foil and copper foil) to obtain a negative plate with proper surface density for later use;
3. sample assembly
Preparing a positive plate and a negative plate;
preparing a membrane (including but not limited to PP/PE membranes, fiberglass membranes, etc.) for use in an assembly process;
winding a square battery cell and a cylindrical battery cell according to the size of the battery shell;
welding the square battery cells and the cylindrical battery cells which are wound, wherein 1 square battery cell is welded to be less than or equal to 4 cylindrical battery cells;
welding the welded battery core and the shell;
filling liquid and sealing the battery cell;
4. sample activation and testing
Electrochemically activating the sample at a small rate (e.g., 0.2C, 0.5C, etc.) current;
and (3) performing constant current charge and discharge test on the sample under a high-rate (such as 1C, 2C, 3C and the like) current.
The technical problems, technical solutions and advantageous effects solved by the present utility model have been further described in detail in the above-described embodiments, and it should be understood that the above-described embodiments are only illustrative of the present utility model and are not intended to limit the present utility model, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present utility model should be included in the scope of protection of the present utility model.
Claims (8)
1. A button lithium ion battery comprising:
a housing (3);
the battery cell group, the battery cell group holding is in shell (3), the battery cell group includes a plurality of parallelly connected electric core, the electric core is including square electric core (1) and at least one arrange in square electric core (1) correspond lateral surface's cylinder electric core (2), the axial of cylinder electric core (2) perpendicular to square electric core (1) correspond lateral surface.
2. The button-type lithium ion battery of claim 1, wherein the button-type lithium ion battery comprises a battery case,
the battery cell comprises at least one positive plate, at least one negative plate and a diaphragm for separating the positive plate from the negative plate.
3. The button-type lithium ion battery of claim 1, wherein the button-type lithium ion battery comprises a battery case,
the cylindrical battery cells (2) are provided with four, are respectively arranged on four outer side surfaces of the square battery cells (1), and two surfaces of the square battery cells () in the axial direction of the shell are a top surface and a bottom surface.
4. The button-type lithium ion battery of claim 1, wherein the button-type lithium ion battery comprises a battery case,
the square battery cell (1) is electrically connected with the positive electrode lug of the cylindrical battery cell (2);
the square battery cell (1) is electrically connected with the negative electrode lug of the cylindrical battery cell (2).
5. The button-type lithium ion battery of claim 4, wherein the button-type lithium ion battery comprises a button-type lithium ion battery,
the positive electrode lugs are electrically connected with the positive electrode of the shell (3) after being electrically connected together;
the negative electrode lugs are electrically connected with the negative electrode of the shell (3) after being electrically connected together.
6. The button-type lithium ion battery of claim 1, wherein the button-type lithium ion battery comprises a battery case,
the cross section of the shell (3) is circular, and the cross section of the square battery cell (1) is inscribed in the cross section of the shell (3).
7. The button-type lithium ion battery of claim 6, wherein the button-type lithium ion battery comprises a battery cell,
the axial longitudinal section of the cylindrical battery cell (2) is inscribed in the cross section of the corresponding filling space.
8. The button-type lithium ion battery of claim 1, wherein the button-type lithium ion battery comprises a battery case,
the battery cell is a winding type battery cell or a laminated type battery cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320550235.2U CN220065767U (en) | 2023-03-21 | 2023-03-21 | Button type lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320550235.2U CN220065767U (en) | 2023-03-21 | 2023-03-21 | Button type lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220065767U true CN220065767U (en) | 2023-11-21 |
Family
ID=88784877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320550235.2U Active CN220065767U (en) | 2023-03-21 | 2023-03-21 | Button type lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220065767U (en) |
-
2023
- 2023-03-21 CN CN202320550235.2U patent/CN220065767U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |