CN114999577A - Method for calculating theoretical liquid retention of lithium ion battery - Google Patents
Method for calculating theoretical liquid retention of lithium ion battery Download PDFInfo
- Publication number
- CN114999577A CN114999577A CN202210649900.3A CN202210649900A CN114999577A CN 114999577 A CN114999577 A CN 114999577A CN 202210649900 A CN202210649900 A CN 202210649900A CN 114999577 A CN114999577 A CN 114999577A
- Authority
- CN
- China
- Prior art keywords
- calculating
- calculated
- follows
- positive electrode
- negative electrode
- 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.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
- G16C10/00—Computational theoretical chemistry, i.e. ICT specially adapted for theoretical aspects of quantum chemistry, molecular mechanics, molecular dynamics or the like
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
- G16C60/00—Computational materials science, i.e. ICT specially adapted for investigating the physical or chemical properties of materials or phenomena associated with their design, synthesis, processing, characterisation or utilisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
-
- 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
Abstract
The invention relates to a method for calculating the theoretical liquid retention capacity of a lithium ion battery, which comprises the following steps: (1) calculating the mass m of the electrolyte solution for decomposition and consumption, the electrolyte solution density rho and the solvent molecular weight Mw; (2) calculating the pore volume Vc of the anode coating on the anode sheet; (3) calculating the pore volume Va of the negative coating on the negative plate; (4) calculating the pore volume Vs of the membrane; (5) calculating the clearance volume Vp of the aluminum-plastic film; (6) and calculating the electrolyte solution retention amount M according to the obtained M, rho, Mw, Vc, Va, Vs and Vp. The invention has the characteristics of short period, low cost, suitability for large-scale production and use and the like.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a method for calculating the theoretical liquid retention capacity of a lithium ion battery.
Background
Soft package lithium ion batteries are widely used in various fields due to their characteristics of small size, high capacity, good cycle performance, high safety performance, etc. The soft package battery is composed of a positive electrode, a negative electrode, an electrolyte and the like, wherein the electrolyte cannot provide capacity for the lithium battery, but is used as an energy transmission medium of the whole battery and has a crucial influence on the performance of the lithium ion battery. Such as the purity of the electrolyte, the chemical composition, the concentration of the electrolyte, and the amount of electrolyte added, all affect the battery performance. When the electrolyte is too little to affect the infiltration of the positive and negative pole pieces and the diaphragm, not only is the ion transmission path enlarged, but also lithium ions cannot freely shuttle between the positive and negative poles, so that the non-infiltrated positive and negative pole materials cannot participate in chemical reaction to transmit energy, and the interface resistance is increased to affect the rate capability and the cycle performance of the lithium battery; however, excessive electrolyte increases the weight of the single cell, reduces the power density and energy density of the battery, and increases the production cost. Therefore, a proper amount of electrolyte plays a crucial role in performance optimization, cost control and environmental protection.
The existing electrolyte adding amount can be determined by capacity test and theoretical calculation. First, the capacities of batteries with different injection amounts are tested to obtain an empirical value of the injection amount per unit capacity, but the empirical value may be different according to the anode and cathode materials, the separator and the type of the battery. And the experimental manufacturing process is complex, the period is long, and the cost is high, so that the experimental manufacturing method is difficult to adapt to the ever-changing market demands. Therefore, the invention discloses a method for theoretically calculating the liquid retention capacity of a lithium battery by testing the size and the physical and chemical properties of the material composition of the lithium battery.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for calculating the theoretical liquid retention capacity of a lithium ion battery, which has the advantages of short period and low cost and is suitable for large-scale production.
The above object of the present invention is achieved by the following technical solutions:
a method for calculating the theoretical liquid retention capacity of a lithium ion battery comprises the following steps:
(1) calculating the mass m of the electrolyte solution for decomposition and consumption, the electrolyte solution density rho and the solvent molecular weight Mw;
(2) calculating the pore volume Vc of the anode coating on the anode sheet;
(3) calculating the pore volume Va of the cathode coating on the cathode plate;
(4) calculating the pore volume Vs of the membrane;
(5) calculating the clearance volume Vp of the aluminum-plastic film;
(6) and calculating the electrolyte retention amount M according to the obtained M, rho, Mw, Vc, Va, Vs and Vp.
The present invention in a preferred example may be further configured to: the battery liquid retention amount is calculated as follows: m ═ M (Vc + Va + Vs + Vp) × ρ + M.
The present invention in a preferred example may be further configured to: the electrolyte mass m is calculated as follows: the specific capacity Ca of the negative electrode material, the first charge-discharge efficiency E, the reaction molar ratio R of the electrolyte and the lithium ions, the molecular weight Mw of the electrolyte solvent, the Faraday constant F and the electrolyte consumption are calculated as follows: m Ca (1-E) Wa La (Ha-Hd) Ti Ra 3.6/F R Mw.
The present invention in a preferred example may be further configured to: the pore volume Vc of the positive coating was calculated as follows: the true density Tc and the ratio Rc of the positive electrode material, the true density Td and the ratio Rd of the conductive agent, the true density Tb and the ratio Rb of the binder, the length Lc of the positive electrode sheet, the width Wc of the positive electrode sheet, the compacted density Te of the positive electrode sheet, the thickness Hc of the positive electrode sheet and the thickness Hf of the positive electrode foil material are calculated as follows: vc ═ Wc × Lc (Hc-Hf) -Wc × Lc (Hc-Hf) × (Rc/Tc + Rd/Td + Rb/Tb) [ (1-Te ═ Rc/Tc + Rd/Td + Rb/Tb) ], Wc × Lc (Hc-Hf).
The invention in a preferred example may be further configured to: the pore volume Va of the anode coating was calculated as follows: the positive electrode foil comprises a negative electrode material, a binder, a negative electrode foil, a positive electrode foil, a negative electrode material, a positive electrode material, a negative electrode material, a positive electrode foil and a negative electrode material, wherein the positive electrode material comprises the following true density Ta and the proportion Ra, the true density Tg and the proportion Rg of the conductive agent, the true density Th and the proportion Rh of the binder, the length La of the negative electrode foil, the width Wa of the negative electrode foil, the compaction density Ti of the negative electrode foil, the thickness Ha of the negative electrode foil and the thickness Hd of the positive electrode foil, and Va is calculated as follows: va ═ Wa × La (Ha-Hd) -Wa × La (Ha-Hd) × (Ra/Ta + Rg/Tg + Rh/Th) ═ 1-Ti (Ra/Ta + Rg/Tg + Rh/Th) ] (Wa × La (Ha-Hd).
The present invention in a preferred example may be further configured to: the pore volume Vs of the membrane is calculated as follows: the porosity Ps of the separator, the length Ls of the separator, the width Ws of the separator, the thickness Hm of the membrane substrate of the separator and the thickness Hn of the coating layer, Va, is calculated as follows: vs ═ Hm + Hn ═ Ls × (Ws) × (Ps).
The present invention in a preferred example may be further configured to: the clearance volume Vp of the aluminum-plastic film is calculated as follows: the length Lp, width Wp and gap ratio Ri of the aluminum-plastic film, Vp is calculated as follows: vp ═ Hc + Ha + Hm + Hn) × Ri × Lp.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the calculation method of the invention calculates the battery liquid injection amount according to the size and the material physical and chemical properties of the lithium battery, thereby being applicable to batteries of various types and materials and being flexible and changeable;
2. the method obtains the liquid retention amount through calculation, has short period and low cost, and is suitable for large-scale production;
3. the invention can avoid the error caused by adopting the experience value with the preset capacity, is more accurate and improves various performances of the battery.
Drawings
In order that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings
FIG. 1 is a liquid retention capacity cycle chart of the present example.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the method for calculating the theoretical liquid retention of the lithium ion battery disclosed by the invention comprises the following steps:
(1) calculating the mass m of the electrolyte solution for decomposition and consumption, the electrolyte solution density rho and the solvent molecular weight Mw;
(2) calculating the pore volume Vc of the anode coating on the anode sheet;
(3) calculating the pore volume Va of the cathode coating on the cathode plate;
(4) calculating the pore volume Vs of the membrane;
(5) calculating the clearance volume Vp of the aluminum-plastic film;
(6) and calculating the electrolyte solution retention amount M according to the obtained M, rho, Mw, Vc, Va, Vs and Vp.
The battery capacity was calculated as follows: m is (Vc + Va + Vs + Vp) × ρ + M.
The electrolyte mass m is calculated as follows: the specific capacity Ca of the negative electrode material, the first charge-discharge efficiency E, the reaction molar ratio R of the electrolyte and the lithium ions, the molecular weight Mw of the electrolyte solvent, the Faraday constant F and the electrolyte consumption are calculated as follows: m ═ Ca ═ E ═ Wa · (Ha-Hd) × Ti · Ra · 3.6/F · R · Mw.
The pore volume Vc of the positive coating was calculated as follows: the true density Tc and the ratio Rc of the positive electrode material, the true density Td and the ratio Rd of the conductive agent, the true density Tb and the ratio Rb of the binder, the length Lc of the positive electrode sheet, the width Wc of the positive electrode sheet, the compacted density Te of the positive electrode sheet, the thickness Hc of the positive electrode sheet and the thickness Hf of the positive electrode foil material are calculated as follows: vc ═ Wc × Lc (Hc-Hf) -Wc × Lc (Hc-Hf) × (Rc/Tc + Rd/Td + Rb/Tb) [ (1-Te ═ Rc/Tc + Rd/Td + Rb/Tb) ], Wc × Lc (Hc-Hf).
The pore volume Va of the anode coating was calculated as follows: the real density Ta and the proportion Ra of the negative electrode material, the real density Tg and the proportion Rg of the conductive agent, the real density Th and the proportion Rh of the binder, the length La of the negative electrode piece, the width Wa of the negative electrode piece, the compaction density Ti of the negative electrode piece, the thickness Ha of the negative electrode piece and the thickness Hd of the positive electrode foil are calculated as follows: va ═ Wa × La (Ha-Hd) -Wa × La (Ha-Hd) × (Ra/Ta + Rg/Tg + Rh/Th) ═ 1-Ti (Ra/Ta + Rg/Tg + Rh/Th) ] (Wa × La (Ha-Hd).
The pore volume Vs of the membrane is calculated as follows: the porosity Ps of the separator, the length Ls of the separator, the width Ws of the separator, the thickness Hm of the membrane substrate of the separator and the thickness Hn of the coating layer, Va, is calculated as follows: vs ═ Hm + Hn ═ Ls × (Ws) × (Ps).
The clearance volume Vp of the aluminum-plastic film is calculated as follows: and calculating Vp according to the length Lp, the width Wp and the clearance ratio Ri of the aluminum-plastic film as follows: vp ═ Hc + Ha + Hm + Hn) × Ri × Lp.
Table 1:
| positive electrode coating | Negative electrode coating | Diaphragm | Aluminum plastic film | Copper foil | Aluminum foil | |
| Long (mm) | 204 | 208 | 159 | 230 | 204 | 208 |
| Width (mm) | 156 | 158 | 213 | 171 | 156 | 158 |
| Thickness (mum) | 131 | 191.6 | 16 | 0.088 | 8 | 13 |
Table 2:
table 3:
table 1-2 shows example design information, table 3 shows that the actual liquid retention amount data calculated according to the information in table 1-2 is 109.7g, and if the part consumed by the electrolyte solution in the reaction is not considered, the battery liquid retention amount is 103.9g, and the performance of the two liquid retention amounts is compared, as can be seen from fig. 1, at 0.5C charge/1C discharge and cell cycle 611 weeks, the retention rate of the cell cycle capacity with the liquid retention amount of 103g is 90.76%, which is lower than 92.61% of the liquid retention amount of 109g, which proves that the electrolyte solution consumed by the SEI film has an influence on the battery performance.
The invention not only considers the conventional electrolyte retention volume, such as the pore volume of the anode coating, the pore volume of the cathode coating, the pore volume of the diaphragm and the pore volume of the aluminum-plastic film, but also considers the electrolyte consumed by the formation of an SEI film and the occurrence of side reactions in the primary charging process of the battery, thereby more accurately obtaining the electrolyte retention capacity of the battery and further improving the cycle performance and the safety performance of the battery; the electrolyte retention amount obtained by the theoretical method can be applied to the actual production process, the cycle performance and the safety performance of the battery are improved, and the production cost is reduced.
The method for calculating the clearance of the aluminum-plastic film can reversely guide the pit depth of the aluminum-plastic film in the pit punching process of the battery cell in the design process by calculating the dry battery cell thickness ratio, more accurately control the thickness of the battery cell and the electrolyte retention capacity, improve the production efficiency and reduce the production cost.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for calculating the theoretical liquid retention capacity of a lithium ion battery is characterized by comprising the following steps:
(1) calculating the mass m of the electrolyte solution for decomposition and consumption, the electrolyte solution density rho and the solvent molecular weight Mw;
(2) calculating the pore volume Vc of the anode coating on the anode sheet;
(3) calculating the pore volume Va of the cathode coating on the cathode plate;
(4) calculating the pore volume Vs of the membrane;
(5) calculating the clearance volume Vp of the aluminum-plastic film;
(6) and calculating the electrolyte retention amount M according to the obtained M, rho, Mw, Vc, Va, Vs and Vp.
2. The method for calculating the theoretical liquid retention capacity of the lithium ion battery according to claim 1, wherein the method comprises the following steps: the battery liquid retention amount is calculated as follows: m is (Vc + Va + Vs + Vp) × ρ + M.
3. The method for calculating the theoretical liquid retention capacity of the lithium ion battery according to claim 1, wherein the method comprises the following steps: the electrolyte mass m is calculated as follows: the specific capacity Ca of the negative electrode material, the first charge-discharge efficiency E, the reaction molar ratio R of the electrolyte and the lithium ions, the molecular weight Mw of the electrolyte solvent, the Faraday constant F and the electrolyte consumption are calculated as follows:
m＝Ca*(1-E)*Wa*La*(Ha-Hd)*Ti*Ra*3.6/F*R*Mw。
4. the method for calculating the theoretical liquid retention capacity of the lithium ion battery according to claim 1, wherein the method comprises the following steps: the pore volume Vc of the positive coating was calculated as follows: the true density Tc and the ratio Rc of the positive electrode material, the true density Td and the ratio Rd of the conductive agent, the true density Tb and the ratio Rb of the binder, the length Lc of the positive electrode sheet, the width Wc of the positive electrode sheet, the compacted density Te of the positive electrode sheet, the thickness Hc of the positive electrode sheet and the thickness Hf of the positive electrode foil material are calculated as follows: vc ═ Wc × Lc (Hc-Hf) -Wc × Lc × (Hc-Hf) × (Rc/Tc + Rd/Td + Rb/Tb) ([ 1-Te × Rc (Rc/Tc + Rd/Td + Rb/Tb) ], Wc × Lc (Hc-Hf).
5. The method for calculating the theoretical liquid retention capacity of the lithium ion battery according to claim 1, characterized in that: the pore volume Va of the anode coating was calculated as follows: the positive electrode foil comprises a negative electrode material, a binder, a negative electrode foil, a positive electrode foil, a negative electrode material, a positive electrode material, a negative electrode material, a positive electrode foil and a negative electrode material, wherein the positive electrode material comprises the following true density Ta and the proportion Ra, the true density Tg and the proportion Rg of the conductive agent, the true density Th and the proportion Rh of the binder, the length La of the negative electrode foil, the width Wa of the negative electrode foil, the compaction density Ti of the negative electrode foil, the thickness Ha of the negative electrode foil and the thickness Hd of the positive electrode foil, and Va is calculated as follows: va ═ Wa × La (Ha-Hd) -Wa × La (Ha-Hd) × (Ra/Ta + Rg/Tg + Rh/Th) ═ 1-Ti (Ra/Ta + Rg/Tg + Rh/Th) ] (Wa × La (Ha-Hd).
6. The method for calculating the theoretical liquid retention capacity of the lithium ion battery according to claim 1, wherein the method comprises the following steps: the pore volume Vs of the membrane is calculated as follows: the porosity Ps of the membrane, the length Ls of the membrane, the width Ws of the membrane, the membrane base film thickness Hm and the coating thickness Hn of the membrane, Va is calculated as follows: vs ═ Hm + Hn ═ Ls × (Ws) × (Ps).
7. The method for calculating the theoretical liquid retention capacity of the lithium ion battery according to claim 1, wherein the method comprises the following steps: the clearance volume Vp of the aluminum-plastic film is calculated as follows: the length Lp, width Wp and gap ratio Ri of the aluminum-plastic film, Vp is calculated as follows: vp ═ Hc + Ha + Hm + Hn) × Ri × Lp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210649900.3A CN114999577A (en) | 2022-06-09 | 2022-06-09 | Method for calculating theoretical liquid retention of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210649900.3A CN114999577A (en) | 2022-06-09 | 2022-06-09 | Method for calculating theoretical liquid retention of lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114999577A true CN114999577A (en) | 2022-09-02 |
Family
ID=83032699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210649900.3A Pending CN114999577A (en) | 2022-06-09 | 2022-06-09 | Method for calculating theoretical liquid retention of lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114999577A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116093558A (en) * | 2023-01-31 | 2023-05-09 | 湖北亿纬动力有限公司 | Method for determining battery liquid injection amount |
-
2022
- 2022-06-09 CN CN202210649900.3A patent/CN114999577A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116093558A (en) * | 2023-01-31 | 2023-05-09 | 湖北亿纬动力有限公司 | Method for determining battery liquid injection amount |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Luo et al. | A dual-functional polymer coating on a lithium anode for suppressing dendrite growth and polysulfide shuttling in Li–S batteries | |
| CN103918108B (en) | Lithium metal doped electrodes for lithium-ion rechargeable chemistry | |
| US11283061B2 (en) | Negative electrode plate, testing method of active specific surface area of electrode plate, battery | |
| CN103199217B (en) | Lithium-rich pole piece of lithium ion battery and preparation method thereof | |
| Nakayama et al. | Factors affecting cyclic durability of all-solid-state lithium polymer batteries using poly (ethylene oxide)-based solid polymer electrolytes | |
| CN101772709B (en) | Lifetime estimating method and deterioration suppressing method for lithium secondary cell, lifetime estimator and deterioration suppressor, battery pack using the same, and charger | |
| Sahore et al. | Practical considerations for testing polymer electrolytes for high-energy solid-state batteries | |
| CN103087452B (en) | Amberplex filled compositions, its preparation method, amberplex and battery | |
| CN101292310B (en) | Lithium ion capacitor | |
| CN105308786A (en) | Battery with reference electrode for voltage monitoring | |
| CN106129455A (en) | Lithium-sulfur cell | |
| CN102110817B (en) | Composition for electrode of nonaqueous electrolyte secondary battery, electrode and secondary battery | |
| CN104538591A (en) | Pre-lithiation method of lithium ion battery negative electrode material | |
| CN110579569A (en) | Method for calculating electrolyte retention in battery | |
| CN109599561A (en) | Binder for all-solid-state lithium ion secondary battery, electrolyte membrane, electrode membrane, battery and preparation method | |
| CN104037458A (en) | Manufacturing method of lithium ion energy storage device | |
| CN105742640A (en) | Binder suitable for silicon-based negative electrode material of lithium ion battery, manufacturing method for binder and negative electrode material | |
| US8822071B2 (en) | Active material for rechargeable battery | |
| CN114999577A (en) | Method for calculating theoretical liquid retention of lithium ion battery | |
| CN110444731A (en) | Method for modifying cathode interface of all-solid-state lithium battery | |
| CN113540437A (en) | Low-temperature lithium ion battery with improved cycle performance | |
| CN114597479A (en) | Flat-plate sodium metal battery and electrochemical device | |
| CN110931850B (en) | Polysiloxane composite electrolyte, application thereof and preparation method thereof | |
| KR20190042673A (en) | Conductive polymeric binders for novel silicon / graphene anodes in lithium ion batteries | |
| CN206961943U (en) | A kind of graphene composite negative structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |