CN117878429A - Battery and battery design method - Google Patents
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- 238000013461 design Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 50
- 239000003792 electrolyte Substances 0.000 claims abstract description 33
- 239000007773 negative electrode material Substances 0.000 claims description 38
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
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- 239000011267 electrode slurry Substances 0.000 claims description 10
- 238000005056 compaction Methods 0.000 claims description 9
- -1 lithium hexafluorophosphate Chemical compound 0.000 claims description 7
- 239000006183 anode active material Substances 0.000 claims description 6
- 229910021383 artificial graphite Inorganic materials 0.000 claims description 6
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- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 claims description 6
- 229910001486 lithium perchlorate Inorganic materials 0.000 claims description 6
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- 239000002210 silicon-based material Substances 0.000 claims description 6
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Abstract
The application discloses a battery and a battery design method, which belong to the technical field of batteries, wherein the battery comprises an anode plate, a cathode plate, electrolyte and a diaphragm; the battery satisfies the following conditions: q=100×s× (1+100×w) × (1+50×c) ×b/SQRT (a)/(d50+p+e); the battery satisfies the following conditions: when Q is more than or equal to 200, the charging time of the full battery is as follows: t is more than or equal to 0 and less than or equal to 10min; when 100 < Q < 200, the charging time is: t is more than or equal to 10min and less than or equal to 15min; when Q is more than 50 and less than or equal to 100, the charging time is as follows: t is more than or equal to 15min and less than or equal to 30min; when Q is more than 20 and less than or equal to 50, the charging time is as follows: t is more than or equal to 30min and less than or equal to 90min; when Q is less than or equal to 20, the charging time is as follows: t is more than or equal to 90min. In this way, the battery charge rate can be evaluated simply and quickly by designing the constants, thereby shortening the battery design period and the verification period.
Description
Technical Field
The embodiment of the application relates to the technical field of batteries, in particular to a battery and a battery design method.
Background
With the improvement of life quality, the requirements on the quick-charging performance of various electronic devices are higher and higher, and with the strong support of the nation on new energy automobiles, the quick-charging is also an important measurement index in the field of electric automobiles. In a power battery system, the main factors for determining the charging rate of the power battery system are physicochemical properties of a negative electrode active material and design technical parameters of a negative electrode plate, including plate surface density, plate compaction, plate size and the like, electrolyte conductivity and slurry conductive agent addition amount; the positive electrode active material has relatively little effect on the battery charge rate.
At present, in order to achieve the required charging rate of the battery, a great deal of time is generally spent for material design selection, battery design parameter adjustment and battery test verification, which results in overlong battery development period and prolonged battery mass production period.
Disclosure of Invention
The embodiment of the application provides a battery, which aims to solve the technical problems that in the prior art, a great deal of time is spent for material design selection, battery design parameters are adjusted and battery test verification is carried out, so that the development period of the battery is overlong, and the mass production period of the battery is prolonged; the embodiment of the application also provides a battery design method.
In order to solve the technical problems, the embodiment of the application discloses the following technical scheme:
in a first aspect, a battery is provided that includes a positive electrode tab, a negative electrode tab, an electrolyte, and a separator;
the design constant Q of the battery is q=100×s× (1+100×w) × (1+50×c) ×b ≡sqrt (a) ≡d50+p+e); wherein D50 represents the median particle diameter of the negative electrode active material in the negative electrode plate, and the unit is mu m; s represents the specific surface area of the negative electrode active material, in cm 2 /g; w represents the coating carbon residue value of the negative electrode active material in units; c represents the addition amount of the conductive agent in the negative electrode slurry of the negative electrode plate in units; a represents the size area of the negative electrode plate, and the unit cm 2 The method comprises the steps of carrying out a first treatment on the surface of the P represents the compacted density of the negative electrode plate, and the unit is g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the E represents the surface density of the coating film on the negative electrode plate, and the unit is g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the B represents the conductivity of the electrolyte in the battery, in mS/cm;
the battery satisfies the following conditions:
when Q is more than or equal to 200, the charging time t required by the full charge of the battery is as follows: t is more than or equal to 0 and less than or equal to 10min;
when 100 < Q < 200, the charging time t is: t is more than or equal to 10min and less than or equal to 15min;
when Q is more than 50 and less than or equal to 100, the charging time t is as follows: t is more than or equal to 15min and less than or equal to 30min;
when Q is more than 20 and less than or equal to 50, the charging time t is as follows: t is more than or equal to 30min and less than or equal to 90min;
when Q is less than or equal to 20, the charging time t is as follows: t is less than or equal to 90min.
With reference to the first aspect, the battery satisfies at least one of the following conditions:
a）5μm≤D50≤19μm；
b）0.8cm 2 /g≤S≤2.5cm 2 /g；
c）0≤W≤15%；
d）0.3%≤C≤3%；
e）10cm 2 ≤A≤1000cm 2 ；
f）1.35g/cm 3 ≤P≤1.75g/cm 3 ；
g）6g/cm 2 ≤E≤15g/cm 2 ；
h）8mS/cm≤B≤20mS/cm。
with reference to the first aspect, the battery satisfies at least one of the following conditions:
i）8μm≤D50≤12μm；
j）1.0cm 2 /g≤S≤1.8cm 2 /g；
k）1%≤W≤5%；
l）0.5%≤C≤1.5%；
m）50cm 2 ≤A≤500cm 2 ；
n）1.45g/cm 3 ≤P≤1.65g/cm 3 ；
o）8g/cm 2 ≤E≤11g/cm 2 ；
p）9mS/cm≤B≤13mS/cm。
in combination with the first aspect, the negative electrode active material includes one or more of artificial graphite, natural graphite, soft carbon, hard carbon, zhong Tanwei beads, and silicon-based materials.
In combination with the first aspect, the electrolyte comprises a lithium salt and an organic solvent, the lithium salt comprises one or more of lithium hexafluorophosphate and lithium perchlorate, and the organic solvent comprises one or more of cyclic carbonate, chain carbonate and carboxylic ester.
In a second aspect, a battery design method is provided, comprising:
designing a positive electrode plate, wherein the mass ratio of a positive electrode active material, a conductive agent and a binder in the positive electrode plate is 95:2.5:2.5;
determining design parameters of a negative electrode plate, and designing the negative electrode plate based on the design parameters; the design parameters include: the negative electrode plateThe median particle diameter D50 of the negative electrode active material of (a) in μm; the specific surface area S of the negative electrode active material is in cm 2 /g; the coating carbon residue value W of the anode active material is in units; the addition amount of the conductive agent in the negative electrode slurry of the negative electrode plate accounts for the unit of C; the size area A of the negative electrode plate is in unit cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The compaction density P of the negative electrode plate is in g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The surface density E of the coating film on the negative electrode plate is in g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The conductivity B of the electrolyte in the battery is in mS/cm;
designing the battery based on the positive electrode tab, separator, negative electrode tab, design parameter, and electrolyte, and the design constant Q of the battery is q=100×s× (1+100×w) × (1+50×c) ×b ++sqrt (a)/(d50+p+e);
the battery satisfies the following conditions:
when Q is more than or equal to 200, the charging time t required by the full charge of the battery is as follows: t is more than or equal to 0 and less than or equal to 10min;
when 100 < Q < 200, the charging time t is: t is more than or equal to 10min and less than or equal to 15min;
when Q is more than 50 and less than or equal to 100, the charging time t is as follows: t is more than or equal to 15min and less than or equal to 30min;
when Q is more than 20 and less than or equal to 50, the charging time t is as follows: t is more than or equal to 30min and less than or equal to 90min;
when Q is less than or equal to 20, the charging time t is as follows: t is more than or equal to 90min.
With reference to the second aspect, the battery satisfies at least one of the following conditions:
a）5μm≤D50≤19μm；
b）0.8cm 2 /g≤S≤2.5cm 2 /g；
c）0≤W≤15%；
d）0.3%≤C≤3%；
e）10cm 2 ≤A≤1000cm 2 ；
f）1.35g/cm 3 ≤P≤1.75g/cm 3 ；
g）6g/cm 2 ≤E≤15g/cm 2 ；
h）8mS/cm≤B≤20mS/cm。
with reference to the second aspect, the battery satisfies at least one of the following conditions:
i）8μm≤D50≤12μm；
j）1.0cm 2 /g≤S≤1.8cm 2 /g；
k）1%≤W≤5%；
l）0.5%≤C≤1.5%；
m）50cm 2 ≤A≤500cm 2 ；
n）1.45g/cm 3 ≤P≤1.65g/cm 3 ；
o）8g/cm 2 ≤E≤11g/cm 2 ；
p）9mS/cm≤B≤13mS/cm。
with reference to the second aspect, the negative electrode active material includes one or more of artificial graphite, natural graphite, soft carbon, hard carbon, zhong Tanwei beads, and silicon-based materials.
With reference to the second aspect, the electrolyte comprises a lithium salt and an organic solvent, wherein the lithium salt comprises one or more of lithium hexafluorophosphate and lithium perchlorate, and the organic solvent comprises one or more of cyclic carbonate, chain carbonate and carboxylate.
One of the above technical solutions has the following advantages or beneficial effects:
compared with the prior art, the battery that this application provided includes: the positive pole piece, the negative pole piece and the electrolyte are contacted, and the negative pole piece is contacted with the electrolyte; the battery satisfies the following conditions: q=100×s× (1+100×w) × (1+50×c) ×b/SQRT (a)/(d50+p+e), wherein Q is a design constant of the battery and D50 represents a median particle diameter of the negative electrode active material in the negative electrode sheet in μm; s represents the specific surface area of the negative electrode active material in cm 2 /g; w represents the coating carbon residue value of the negative electrode active material in units; c represents the addition amount of the conductive agent in the negative electrode slurry of the negative electrode plate in units; a represents the size area of the negative electrode plate, and the unit is cm 2 The method comprises the steps of carrying out a first treatment on the surface of the P represents the compacted density of the negative electrode plate, and the unit is g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the E represents the surface density of the coating film on the negative electrode plate, and the unit is g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the B represents the conductivity of the electrolyte in the battery, in mS/cm; the battery satisfies the following conditions: when Q is more than or equal to 200, the battery is charged when the battery is fully chargedAnd the interval t is as follows: t is more than or equal to 0 and less than or equal to 10min; when 100 < Q < 200, the charging time t is: t is more than or equal to 10min and less than or equal to 15min; when Q is more than 50 and less than or equal to 100, the charging time t is as follows: t is more than or equal to 15min and less than or equal to 30min; when Q is more than 20 and less than or equal to 50, the charging time t is as follows: t is more than or equal to 30min and less than or equal to 90min; when Q is less than or equal to 20, the charging time t is as follows: t is more than or equal to 90min. Thus, the charge rate of the battery can be simply and rapidly determined by designing the constant, thereby greatly shortening the design period and the verification period of the battery.
It can be appreciated that the battery design method provided in the present application has all the technical features and beneficial effects of the above battery, and will not be described herein.
Detailed Description
The technical solutions of the present application will be clearly and completely described below in connection with the embodiments of the present application.
As used herein, unless otherwise indicated, "a," "an," "the," "at least one," and "one or more" are used interchangeably without the use of quantitative terms. The use of the singular forms herein is intended to include the plural forms as well, unless the context clearly indicates otherwise.
In the description herein, it is to be noted that "above" and "below" do not include the present number, and "one or more" means two or more "in the meaning of" multiple "unless otherwise specified.
Where a composition is described as comprising or including a particular component, it is contemplated that optional components not referred to herein are not excluded from the composition, and that the composition may consist or consist of the recited components, or where a method is described as comprising or including a particular process step, it is contemplated that optional process steps not referred to herein are not excluded from the method, and that the method may consist or consist of the recited process steps.
For simplicity, only a few numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form a range not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and any upper limit may be combined with any other upper limit to form a range not explicitly recited. Furthermore, each point or individual value between the endpoints of the range is included within the range, although not explicitly recited. Thus, each point or individual value may be combined as a lower or upper limit on itself with any other point or individual value or with other lower or upper limit to form a range that is not explicitly recited.
The terms "preferred" and "preferably" refer to embodiments of the present application that may provide certain benefits in certain circumstances. However, other embodiments may be preferred under the same or other circumstances. In addition, recitation of one or more preferred embodiments does not imply that other embodiments are not useful, and is not intended to exclude other embodiments from the scope of the application.
The embodiment of the application provides a battery, which comprises a positive pole piece, a negative pole piece, electrolyte and a diaphragm;
the battery satisfies the following conditions:
Q＝100×S×（1+100×W）×（1+50×C）×B÷SQRT（A）÷（D50+P+E），
wherein Q is a design constant of the battery, D50 represents the median particle diameter of the negative electrode active material in the negative electrode plate, and the unit is mu m; s represents the specific surface area of the negative electrode active material in cm 2 /g; w represents the coating carbon residue value of the negative electrode active material in units; c represents the addition amount of the conductive agent in the negative electrode slurry of the negative electrode plate in units; a represents the size area of the negative electrode plate, and the unit is cm 2 The method comprises the steps of carrying out a first treatment on the surface of the SQRT is Square Root Calculations, i.e., square root calculation; p represents the compacted density of the negative electrode plate, and the unit is g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the E represents the surface density of the coating film on the negative electrode plate, and the unit is g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the B represents the conductivity of the electrolyte in the cell in mS/cm.
In some embodiments, the design constants satisfy:
when Q is more than or equal to 200, the charging time t required by fully charging the battery is as follows: t is more than or equal to 0 and less than or equal to 10min;
when 100 < Q < 200, the charging time t satisfies the following conditions: t is more than or equal to 10min and less than or equal to 15min;
when Q is more than 50 and less than or equal to 100, the charging time t meets the following conditions: t is more than or equal to 15min and less than or equal to 30min;
when Q is more than 20 and less than or equal to 50, the charging time t meets the following conditions: t is more than or equal to 30min and less than or equal to 90min;
when Q is less than or equal to 20, the charging time t meets the following conditions: t is less than or equal to 90min;
specifically, in the above design constants, the median diameter D50, the specific surface area S, the coated carbon residue value W, the areal density E and the compacted density P of the negative electrode sheet of the negative electrode active material directly affect the dynamic performance of the battery. Wherein, the smaller the particle diameter of the median particle diameter D50, the larger the specific surface area S, the larger the coating carbon residue value W, the shorter the lithium ion migration path, the more the lithium intercalation path, and the better the dynamic performance of the battery; the smaller the surface density E of the negative plate is, the smaller the compaction density P is, the less the negative active material coated on the current collector is, the shorter the lithium ion migration path is in the charge and discharge process of the battery, and the better the dynamic performance of the lithium ion battery is; the greater the surface density E of the negative electrode plate is, the greater the compaction density P is, the worse the electrolyte wettability of the negative electrode plate is, the electrolyte cannot fully infiltrate the negative electrode active material, and the greater the interface charge transfer impedance between the negative electrode active material and the electrolyte is, so that the improvement of the battery charging capacity is not facilitated. The more the addition amount of the conductive agent in the cathode slurry is in the ratio C, the larger the conductivity B of the electrolyte is, and the better the dynamic performance of the battery is.
Thus, the battery charge rate can be simply and rapidly estimated by designing the constant, thereby greatly shortening the battery design period and the verification period.
In some embodiments, the battery satisfies at least one of the following conditions:
a）5μm≤D50≤19μm；
b）0.8cm 2 /g≤S≤2.5cm 2 /g；
c）0≤W≤15%；
d）0.3%≤C≤3%；
e）10cm 2 ≤A≤1000cm 2 ；
f）1.35g/cm 3 ≤P≤1.75g/cm 3 ；
g）6g/cm 2 ≤E≤15g/cm 2 ；
h）8mS/cm≤B≤20mS/cm。
preferably, in some embodiments, the battery satisfies at least one of the following conditions:
i）8μm≤D50≤12μm；
j）1.0cm 2 /g≤S≤1.8cm 2 /g；
k）1%≤W≤5%；
l）0.5%≤C≤1.5%；
m）50cm 2 ≤A≤500cm 2 ；
n）1.45g/cm 3 ≤P≤1.65g/cm 3 ；
o）8g/cm 2 ≤E≤11g/cm 2 ；
p）9mS/cm≤B≤13mS/cm。
in some embodiments, the negative active material comprises one or more of artificial graphite, natural graphite, soft carbon, hard carbon, zhong Tanwei beads, silicon-based materials.
In some embodiments, the electrolyte comprises a lithium salt and an organic solvent, the lithium salt comprises one or more of lithium hexafluorophosphate and lithium perchlorate, and the organic solvent comprises one or more of cyclic carbonate, chain carbonate and carboxylate.
In addition, the kind of the conductive agent and the binder in the anode slurry is not particularly limited, and may be selected according to actual requirements.
Accordingly, an embodiment of the present application provides a battery design method, including:
the positive electrode plate is designed, and the mass ratio of the positive electrode active material, the conductive agent and the adhesive in the positive electrode plate is 95:2.5:2.5. The type of the positive electrode active material in the present application is not limited, and may be selected according to actual requirements.
Determining design parameters of the negative electrode plate, and designing the negative electrode plate based on the design parameters; the design parameters include: the median particle diameter D50 of the negative electrode active material of the negative electrode plate is unit mu m; specific surface area S of negative electrode active material, unit cm 2 /g; coating carbon residue value W of the negative electrode active material in units; the addition amount of the conductive agent in the negative electrode slurry of the negative electrode plate accounts for the unit of C; size area A of negative pole piece, unit cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The compaction density P of the negative pole piece, and the unit g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Surface density E of coating film on negative pole piece, unit g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The conductivity B of the electrolyte in the cell,units mS/cm.
The battery is designed based on the positive electrode plate, the diaphragm, the negative electrode plate, the design parameters and the electrolyte, and the battery meets the following conditions:
Q＝100×S×（1+100×W）×（1+50×C）×B÷SQRT（A）÷（D50+P+E），
wherein Q is a design constant of the battery.
In some embodiments, the design constants satisfy:
when Q is more than or equal to 200, the charging time t required by fully charging the battery is as follows: t is more than or equal to 0 and less than or equal to 10min;
when 100 < Q < 200, the charging time t satisfies the following conditions: t is more than or equal to 10min and less than or equal to 15min;
when Q is more than 50 and less than or equal to 100, the charging time t meets the following conditions: t is more than or equal to 15min and less than or equal to 30min;
when Q is more than 20 and less than or equal to 50, the charging time t meets the following conditions: t is more than or equal to 30min and less than or equal to 90min;
when Q is less than or equal to 20, the charging time t meets the following conditions: t is less than or equal to 90min.
Specifically, in the above design parameters, the median diameter D50, the specific surface area S, the coated carbon residue value W, the surface density E and the compacted density P of the negative electrode sheet of the negative electrode active material directly affect the dynamic performance of the battery. Wherein, the smaller the particle diameter of the median particle diameter D50, the larger the specific surface area S, the larger the coating carbon residue value W, the shorter the lithium ion migration path, the more the lithium intercalation path, and the better the dynamic performance of the battery; the smaller the surface density E of the negative plate is, the smaller the compaction density P is, the less the negative active material coated on the current collector is, the shorter the lithium ion migration path is in the charge and discharge process of the battery, and the better the dynamic performance of the lithium ion battery is; the greater the surface density E of the negative electrode plate is, the greater the compaction density P is, the worse the electrolyte wettability of the negative electrode plate is, the electrolyte cannot fully infiltrate the negative electrode active material, and the greater the interface charge transfer impedance between the negative electrode active material and the electrolyte is, so that the improvement of the battery charging capacity is not facilitated. The more the addition amount of the conductive agent in the cathode slurry is in the ratio C, the larger the conductivity B of the electrolyte is, and the better the dynamic performance of the battery is.
Thus, the battery charge rate can be simply and rapidly estimated by designing the constant, thereby greatly shortening the battery design period and the verification period.
In some embodiments, the battery satisfies at least one of the following conditions:
a）5μm≤D50≤19μm；
b）0.8cm 2 /g≤S≤2.5cm 2 /g；
c）0≤W≤15%；
d）0.3%≤C≤3%；
e）10cm 2 ≤A≤1000cm 2 ；
f）1.35g/cm 3 ≤P≤1.75g/cm 3 ；
g）6g/cm 2 ≤E≤15g/cm 2 ；
h）8mS/cm≤B≤20mS/cm。
preferably, in some embodiments, the battery satisfies at least one of the following conditions:
i）8μm≤D50≤12μm；
j）1.0cm 2 /g≤S≤1.8cm 2 /g；
k）1%≤W≤5%；
l）0.5%≤C≤1.5%；
m）50cm 2 ≤A≤500cm 2 ；
n）1.45g/cm 3 ≤P≤1.65g/cm 3 ；
o）8g/cm 2 ≤E≤11g/cm 2 ；
p）9mS/cm≤B≤13mS/cm。
in some embodiments, the negative active material comprises one or more of artificial graphite, natural graphite, soft carbon, hard carbon, zhong Tanwei beads, silicon-based materials.
In some embodiments, the electrolyte comprises a lithium salt and an organic solvent, the lithium salt comprises one or more of lithium hexafluorophosphate and lithium perchlorate, and the organic solvent comprises one or more of cyclic carbonate, chain carbonate and carboxylate.
In addition, the kind of the conductive agent and the binder in the anode slurry is not particularly limited, and may be selected according to actual requirements.
The advantageous effects of the present invention are further illustrated below with reference to examples.
Examples
The following examples more particularly describe the disclosure of the present application, which are intended as illustrative only, since numerous modifications and variations within the scope of the disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the examples below are by weight, and all reagents used in the examples are commercially available or were obtained synthetically according to conventional methods and can be used directly without further treatment, as well as the instruments used in the examples.
1. Based on the above battery design method of the present application, a battery for an embodiment is prepared, including:
firstly) preparing a positive electrode plate; specifically, uniformly mixing an anode active material, a conductive agent and a binder according to a mass ratio of 95:2.5:2.5, adding a solvent N-methylpyrrolidone (NMP), and stirring to uniformity under the action of a vacuum stirrer to obtain anode slurry; and uniformly coating the positive electrode slurry on a positive electrode current collector, drying in an oven, rolling, and cutting according to the design size to obtain a positive electrode plate.
Secondly), preparing a negative electrode plate; based on the design parameters, mixing the selected anode active material, the conductive agent, the thickener carboxymethyl cellulose (CMC) and the binder styrene-butadiene rubber (SBR) according to a certain mass ratio, adding deionized water, and stirring to be uniform under the action of a vacuum stirrer to obtain anode slurry; and uniformly coating the negative electrode slurry on a negative electrode current collector, drying in an oven, and then rolling and cutting according to a designed size area A to obtain a negative electrode plate.
Thirdly), a Polyethylene (PE) diaphragm is selected as the diaphragm;
fourth), preparing a battery; sequentially stacking the positive electrode plate, the diaphragm and the negative electrode plate, and winding or laminating to obtain a bare cell; and placing the bare cell in an outer packaging shell, vacuum drying, injecting electrolyte, and performing vacuum packaging, standing, formation, capacity division and other procedures to obtain the battery.
Fifth), three-electrode manufacturing:
the method comprises the steps of implanting copper wires into a laminated pole group after acid soaking and alcohol washing, performing top side sealing, liquid injection and pre-charging to form the laminated pole group, performing nickel strap welding on a battery, performing lithium transition on the battery, and performing a three-electrode charging capability test.
2. Determining the actual value of the design parameter in the battery:
measuring the particle size distribution of the anode active material by using a laser diffraction particle size distribution measuring instrument (Markov 3000) to obtain a median particle size D50; the specific surface area S of the negative electrode active material was measured using a specific surface area meter (Beijing Bei Shide H-2000A); testing the coating residual carbon value W of the anode active material by a thermal weightlessness test; calculating the size, the surface density and the compaction density of the negative electrode plate according to the actual value of the plate; the electrolyte conductivity B was measured by a conductivity tester.
The actual values of the design parameters, the calculation results of the design constants Q, and the charging time test results of the three-electrode 0-100SOC of examples 1-33 are shown in Table 1.
TABLE 1
In table 1, D50 represents the median particle diameter of the negative electrode active material of the negative electrode tab in the battery, in μm; s represents the specific surface area of the negative electrode active material in cm 2 /g; w represents the coating carbon residue value of the negative electrode active material in units; c represents the addition amount of the conductive agent in the negative electrode slurry of the negative electrode plate in units; a represents the size area of the negative electrode plate, and the unit is cm 2 The method comprises the steps of carrying out a first treatment on the surface of the P represents the compacted density of the negative electrode plate, and the unit is g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the E represents the surface density of the coating film on the negative electrode plate, and the unit is g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the B represents the conductivity of the electrolyte in the cell in mS/cm.
As can be seen from table 1 above, the charge rate of the battery designed in the present application is closely related to the calculated value of Q, i.e., the charge rate of the battery is determined according to the design constant q=100×s× (1+100×w) × (1+50×c) ×b ≡sqrt (a) ≡d50+p+e), wherein:
when Q is more than or equal to 200, the charging time t required by fully charging the battery is as follows: t is more than or equal to 0 and less than or equal to 10min;
when 100 < Q < 200, the charging time t satisfies the following conditions: t is more than or equal to 10min and less than or equal to 15min;
when Q is more than 50 and less than or equal to 100, the charging time t meets the following conditions: t is more than or equal to 15min and less than or equal to 30min;
when Q is more than 20 and less than or equal to 50, the charging time t meets the following conditions: t is more than or equal to 30min and less than or equal to 90min;
when Q is less than or equal to 20, the charging time t meets the following conditions: t is less than or equal to 90min.
The method and the device can evaluate the battery charging rate simply and quickly through the design constant, so that the battery design period and the verification period are greatly shortened.
The design constants of the present application are suitable for all designed lithium ion batteries, and thus, a person skilled in the art can quickly determine the charge rate of the designed battery according to the relationship between the design constants and the charge rate.
The foregoing has described in detail a battery and a battery design method provided by embodiments of the present application, and specific examples are applied herein to illustrate the principles and embodiments of the present application, where the foregoing examples are only for helping to understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some 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.
Claims (10)
1. The battery is characterized by comprising a positive electrode plate, a negative electrode plate, electrolyte and a diaphragm;
the design constant Q of the battery is q=100×s× (1+100×w) × (1+50×c) ×b ≡sqrt (a) ≡d50+p+e); wherein D50 represents the median particle diameter of the negative electrode active material in the negative electrode plate, and the unit is mu m; s represents the specific surface area of the negative electrode active material, in cm 2 /g; w represents the coating carbon residue value of the negative electrode active material in units; c represents the addition amount of the conductive agent in the negative electrode slurry of the negative electrode plate in units; a represents the size and the area of the negative electrode plate, and is a singlePosition cm 2 The method comprises the steps of carrying out a first treatment on the surface of the P represents the compacted density of the negative electrode plate, and the unit is g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the E represents the surface density of the coating film on the negative electrode plate, and the unit is g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the B represents the conductivity of the electrolyte in the battery, in mS/cm;
the battery satisfies the following conditions:
when Q is more than or equal to 200, the charging time t required by the full charge of the battery is as follows: t is more than or equal to 0 and less than or equal to 10min;
when 100 < Q < 200, the charging time t is: t is more than or equal to 10min and less than or equal to 15min;
when Q is more than 50 and less than or equal to 100, the charging time t is as follows: t is more than or equal to 15min and less than or equal to 30min;
when Q is more than 20 and less than or equal to 50, the charging time t is as follows: t is more than or equal to 30min and less than or equal to 90min;
when Q is less than or equal to 20, the charging time t is as follows: t is more than or equal to 90min.
2. The battery of claim 1, wherein the battery satisfies at least one of the following conditions:
a）5μm≤D50≤19μm；
b）0.8cm 2 /g≤S≤2.5cm 2 /g；
c）0≤W≤15%；
d）0.3%≤C≤3%；
e）10cm 2 ≤A≤1000cm 2 ；
f）1.35g/cm 3 ≤P≤1.75g/cm 3 ；
g）6g/cm 2 ≤E≤15g/cm 2 ；
h）8mS/cm≤B≤20mS/cm。
3. the battery of claim 2, wherein the battery satisfies at least one of the following conditions:
i）8μm≤D50≤12μm；
j）1.0cm 2 /g≤S≤1.8cm 2 /g；
k）1%≤W≤5%；
l）0.5%≤C≤1.5%；
m）50cm 2 ≤A≤500cm 2 ；
n）1.45g/cm 3 ≤P≤1.65g/cm 3 ；
o）8g/cm 2 ≤E≤11g/cm 2 ；
p）9mS/cm≤B≤13mS/cm。
4. the battery according to claim 1, wherein the negative electrode active material comprises one or more of artificial graphite, natural graphite, soft carbon, hard carbon, zhong Tanwei beads, and a silicon-based material.
5. The battery according to claim 1, wherein the electrolyte comprises a lithium salt and an organic solvent, the lithium salt comprises one or more of lithium hexafluorophosphate and lithium perchlorate, and the organic solvent comprises one or more of cyclic carbonate, chain carbonate and carboxylate.
6. A battery design method, comprising:
designing a positive electrode plate, wherein the mass ratio of a positive electrode active material, a conductive agent and a binder in the positive electrode plate is 95:2.5:2.5;
determining design parameters of a negative electrode plate, and designing the negative electrode plate based on the design parameters; the design parameters include: the median particle diameter D50 of the negative electrode active material of the negative electrode plate is unit mu m; the specific surface area S of the negative electrode active material is in cm 2 /g; the coating carbon residue value W of the anode active material is in units; the addition amount of the conductive agent in the negative electrode slurry of the negative electrode plate accounts for the unit of C; the size area A of the negative electrode plate is in unit cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The compaction density P of the negative electrode plate is in g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The surface density E of the coating film on the negative electrode plate is in g/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The conductivity B of the electrolyte in the battery is in mS/cm;
designing a battery based on the positive electrode tab, separator, negative electrode tab, design parameter, and electrolyte, and a design constant Q of the battery is q=100×s× (1+100×w) × (1+50×c) ×b ≡sqrt (a) ≡d50+p+e);
the battery satisfies the following conditions:
when Q is more than or equal to 200, the charging time t required by the full charge of the battery is as follows: t is more than or equal to 0 and less than or equal to 10min;
when 100 < Q < 200, the charging time t is: t is more than or equal to 10min and less than or equal to 15min;
when Q is more than 50 and less than or equal to 100, the charging time t is as follows: t is more than or equal to 15min and less than or equal to 30min;
when Q is more than 20 and less than or equal to 50, the charging time t is as follows: t is more than or equal to 30min and less than or equal to 90min;
when Q is less than or equal to 20, the charging time t is as follows: t is more than or equal to 90min.
7. The battery design method according to claim 6, wherein the battery satisfies at least one of the following conditions:
a）5μm≤D50≤19μm；
b）0.8cm 2 /g≤S≤2.5cm 2 /g；
c）0≤W≤15%；
d）0.3%≤C≤3%；
e）10cm 2 ≤A≤1000cm 2 ；
f）1.35g/cm 3 ≤P≤1.75g/cm 3 ；
g）6g/cm 2 ≤E≤15g/cm 2 ；
h）8mS/cm≤B≤20mS/cm。
8. the battery design method according to claim 7, wherein the battery satisfies at least one of the following conditions:
i）8μm≤D50≤12μm；
j）1.0cm 2 /g≤S≤1.8cm 2 /g；
k）1%≤W≤5%；
l）0.5%≤C≤1.5%；
m）50cm 2 ≤A≤500cm 2 ；
n）1.45g/cm 3 ≤P≤1.65g/cm 3 ；
o）8g/cm 2 ≤E≤11g/cm 2 ；
p）9mS/cm≤B≤13mS/cm。
9. the battery design method according to claim 6, wherein the negative electrode active material comprises one or more of artificial graphite, natural graphite, soft carbon, hard carbon, zhong Tanwei beads, and a silicon-based material.
10. The method according to claim 6, wherein the electrolyte solution comprises a lithium salt and an organic solvent, the lithium salt comprises one or more of lithium hexafluorophosphate and lithium perchlorate, and the organic solvent comprises one or more of cyclic carbonate, chain carbonate and carboxylic ester.
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