Capacitor-assisted battery cell
A pouch-type, capacitor-assisted battery cell includes: N negative electrodes, where N is an integer greater than one, each of the N negative electrodes includes a first current collector, first particulate electrode material, and a first tab; P positive electrodes, where: P-M ones of the P positive electrodes include a second current collector, second particulate electrode material, and a second tab, M ones of the P positive electrodes include a third current collector, third particulate electrode material including activated carbon (AC) arranged on opposite sides of the third current collector, and a third tab, and P=N−1 and M=2; separators arranged between the N negative electrodes and the P positive electrodes; and a pouch enclosure surrounding the N negative electrodes, the P positive electrodes and the separators; where the M ones of the P positive electrodes are located approximately equidistant from a center of the P positive electrodes.
1. A pouch-type, capacitor-assisted battery cell, comprising:
N negative electrodes, where N is an integer greater than one, wherein each of the N negative electrodes comprises a first current collector, first particulate electrode material arranged on opposite sides of the first current collector, and a first tab;
P positive electrodes, wherein:
P-M ones of the P positive electrodes comprise a second current collector, second particulate electrode material comprising lithium iron phosphate (LFP) arranged on opposite sides of the second current collector, and a second tab,
M ones of the P positive electrodes comprise a third current collector, third particulate electrode material comprising activated carbon (AC) arranged on opposite sides of the third current collector, and a third tab, and
P=N−1 and M=2;
separators arranged between the N negative electrodes and the P positive electrodes; and
a pouch enclosure surrounding the N negative electrodes, the P positive electrodes and the separators;
wherein the M ones of the P positive electrodes are located approximately equidistant from a center of the P positive electrodes; and
wherein N=28 and the M ones of the P positive electrodes are located at 3rd and 25 th locations.
2. The pouch-type, capacitor-assisted battery cell of claim 1 , wherein the first particulate electrode material of the N negative electrodes comprises graphite.
3. The pouch-type, capacitor-assisted battery cell of claim 2 , wherein the first particulate electrode material of the N negative electrodes further comprises conductive carbon, carboxymethyl cellulose (CMC) and styrene butadiene copolymer (SBR).
4. The pouch-type, capacitor-assisted battery cell of claim 3 , wherein weight percentages of the graphite, the conductive carbon, the carboxymethyl cellulose (CMC) and the styrene butadiene copolymer (SBR) are 94% to 96%, 1.5% to 2.5%, 1% to 2%, and 1% to 2% (wt %).
5. The pouch-type, capacitor-assisted battery cell of claim 1 , wherein:
the first particulate electrode material of the N negative electrodes has a thickness on opposite sides of the first current collector in a range of 31 μm (+/−5 μm);
the first current collector comprises copper foil having a thickness in a range of 8 μm (+/−2 μm);
the first current collector has a width in a range of 13.2 cm (+/−5%); and
the first current collector has a height in a range of 10.3 cm (+/−5%).
6. The pouch-type, capacitor-assisted battery cell of claim 5 , wherein the separators comprise:
a first layer of ceramic layer;
a second layer of polyethylene film; and
a third layer of ceramic.
7. The pouch-type, capacitor-assisted battery cell of claim 5 , wherein:
the separators have a thickness in a range of 13 μm (+/−2 μm); and
the separators have a height in a range of 10.7 cm (+/−5%).
8. The pouch-type, capacitor-assisted battery cell of claim 5 , further comprising electrolyte.
9. The pouch-type, capacitor-assisted battery cell of claim 8 , wherein the electrolyte comprises 1.2M lithium hexafluorophosphate (LiPF 6 ), ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC).
10. The pouch-type, capacitor-assisted battery cell of claim 9 , wherein the electrolyte further comprises at least one of vinylene carbonate, lithium difluorophosphate, and ethylene sulfate (DTD).
11. The pouch-type, capacitor-assisted battery cell of claim 1 , wherein the second particulate electrode material of the P-M ones of the P positive electrodes further comprises conductive carbon, carbon nanotubes and polyvinylidene fluoride.
12. The pouch-type, capacitor-assisted battery cell of claim 11 , wherein weight percentages of the lithium iron phosphate, the conductive carbon, the carbon nanotubes and the polyvinylidene fluoride are 90 to 94%, 4 to 6%, 0.1% to 0.4% and 2 to 4% (wt %), respectively.
13. The pouch-type, capacitor-assisted battery cell of claim 1 , wherein:
the second particulate electrode material of the P-M ones of the P positive electrodes have a thickness opposite sides of the third current collector in a range of 50 μm (+/−5 μm);
the second current collector comprises carbon-coated aluminum foil having a thickness in a range of 12 μm (+/−2 μm);
the second current collector has a width in a range of 13 cm (+/−5%); and
the second current collector has a height in a range of 10 cm (+/−5%).
14. The pouch-type, capacitor-assisted battery cell of claim 1 , wherein:
the third particulate electrode material of the M ones of the P positive electrodes has a thickness on opposite sides of the third current collector in a range of 100 μm (+/−30 μm);
the third current collector comprises etched aluminum foil having a thickness in a range of 20 μm (+/−2 μm);
the third current collector has a width in a range of 13 cm (+/−5%); and
the third current collector has a height in a range of 10 cm (+/−5%).
15. The pouch-type, capacitor-assisted battery cell of claim 1 , wherein:
the third particulate electrode material of the M ones of the P positive electrodes have a thickness opposite sides of the third current collector in a range of 100 μm (+/−30 μm); and
the third current collector comprises etched aluminum foil having a thickness in a range of 20 μm (+/−2 μm).
16. A pouch-type, capacitor-assisted battery cell, comprising:
N negative electrodes, where N is equal to 28, wherein each of the N negative electrodes comprises a first current collector having a width in a range of 13.2 cm (+/−5%) and a height in a range of 10.3 cm (+/−5%), first particulate electrode material comprising graphite arranged on opposite sides of the first current collector, and a first tab;
P positive electrodes, wherein:
P-M ones of the P positive electrodes comprise a second current collector having a width in a range of 13 cm (+/−5%) and a height in a range of 10 cm (+/−5%), second particulate electrode material comprising lithium iron phosphate (LFP) arranged on opposite sides of the second current collector, and a second tab;
M ones of the P positive electrodes comprise a third current collector having a width in a range of 13 cm (+/−5%) and a height in a range of 10 cm (+/−5%), third particulate electrode material comprising activated carbon (AC) arranged on opposite sides of the third current collector, and a third tab; and
P is equal to 27 and M is equal to 2;
separators arranged between the N negative electrodes and the P positive electrodes; and
a pouch enclosure surrounding the N negative electrodes, the P positive electrodes and the separators.
17. The pouch-type, capacitor-assisted battery cell of claim 16 , wherein the M ones of the P positive electrodes are located at a 3rd and 25 th location.
18. The pouch-type, capacitor-assisted battery cell of claim 16 , wherein:
the first particulate electrode material of the N negative electrodes further comprises conductive carbon, carboxymethyl cellulose (CMC) and styrene butadiene copolymer (SBR), and
weight percentages of the graphite, the conductive carbon, the carboxymethyl cellulose (CMC) and the styrene butadiene copolymer (SBR) are 94% to 96%, 1.5% to 2.5%, 1% to 2%, and 1% to 2% (wt %), respectively;
the first particulate electrode material of the N negative electrodes has a thickness on opposite sides of the first current collector in a range of 31 μm (+/−5 μm); and
the first current collector comprises copper foil having a thickness in a range of 8 μm (+/−2 μm).
19. The pouch-type, capacitor-assisted battery cell of claim 16 , wherein:
the second particulate electrode material of the P-M ones of the P positive electrodes further comprises conductive carbon, carbon nanotubes and polyvinylidene fluoride,
weight percentages of the lithium iron phosphate, the conductive carbon, the carbon nanotubes and the polyvinylidene fluoride correspond to 90 to 94%, 4 to 6%, 0.1% to 0.4% and 2 to 4% (wt %), respectively;
the second particulate electrode material of the P-M ones of the P positive electrodes have a thickness opposite sides of the third current collector in a range of 50 μm (+/−5 μm); and
the second current collector comprises carbon-coated aluminum foil having a thickness in a range of 12 μm (+/−2 μm).