A carbon emission accounting system for sintering positive electrode materials of lithium batteries

Abstract

The present invention relates to the technical field of carbon emission accounting, and discloses a carbon emission accounting system for the sintering of positive electrode materials for lithium batteries, including: a material balance module, an energy balance module, a carbon emission accounting module, a data module, and a knowledge module; the material balance module obtains formulas and data to calculate the lithium element loss during the sintering process; the energy balance module obtains data to calculate the energy loss during the sintering process; the carbon emission accounting module obtains formulas, data, lithium element loss, and energy loss to calculate the carbon emissions during the sintering process; the data module is used to store data; the knowledge module is used to store formulas and parameter values ​​in the accounting process. Beneficial effects: The present invention fully considers the carbon emissions involved in the entire positive electrode material sintering process through the material balance module, the energy balance module, and the carbon emission accounting module. The overall carbon emissions can be quickly and efficiently calculated through the input data and the pre-stored accounting formula.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon emission accounting, and in particular to a carbon emission accounting system for sintering positive electrode materials of lithium batteries. Background Art

[0002] At present, the power system is undergoing transformation with the goal of carbon neutrality. In the newly formed power system, the energy storage system with power batteries as the main body needs to be deeply involved. However, with the rapid growth of power battery production capacity and volume, a large amount of carbon emissions will be generated in the production process of power batteries and upstream and downstream industrial chains. And as an important component of carbon emissions throughout the life cycle of electric vehicles, the carbon emissions of power batteries have become a core concern in the transportation field.

[0003] The carbon emissions of power batteries cannot be underestimated. They are mainly concentrated in two links: one is the production of battery cells, and the other is the production of key materials such as upstream positive and negative electrodes. Among the key materials for lithium batteries, the production of positive electrode materials consumes the most energy. In order to achieve the goal of carbon neutrality, a carbon emission accounting system for the sintering of lithium battery positive electrode materials is needed to account for the carbon emissions in the preparation process of lithium battery positive electrode materials. Summary of the invention

[0004] The purpose of the present invention is to provide a carbon emission accounting system for sintering lithium battery positive electrode materials to calculate the carbon emission in the preparation process of lithium battery positive electrode materials.

[0005] In order to achieve the above-mentioned objectives, the present invention provides a carbon emission accounting system for the sintering of lithium battery positive electrode materials, comprising: a material balance module, an energy balance module, a carbon emission accounting module, a data module, and a knowledge module; the material balance module is used to read a first formula from the knowledge module and read first data from the data module to calculate the lithium element loss during the sintering process of the lithium battery positive electrode material; the energy balance module is used to read a second formula from the knowledge module and read second data from the data module to calculate the energy loss during the sintering process of the lithium battery positive electrode material; the carbon emission accounting module is used to read a third formula from the knowledge module and read third data from the data module, lithium element loss, and energy loss to calculate the carbon emissions during the sintering process of the lithium battery positive electrode material; the data module is used to store first data, second data, third data, and intermediate data generated in the accounting system; the knowledge module is used to store the first formula, the second formula, the third formula, and the parameter values ​​in the calculation process.

[0006] Further, the first data includes: the mass of the sagger after filling before sintering, the mass of the crystal water in the precursor, the mass of the sagger taken out of the furnace after sintering, the molar amount of the precursor in the raw material before sintering, and the molar amount of lithium carbonate in the raw material before sintering; the first formula is specifically:

[0007] MLi损 =M 前 -M 水 -M 后 -10a-44b;

[0008] Among them, M Li损 Indicates the loss of lithium element, M 前 Indicates the mass of the sagger before sintering, M 水 Indicates the mass of crystal water in the precursor, M 后 It represents the mass of the sagger taken out of the furnace after sintering, a represents the molar amount of the precursor in the raw material before sintering; b represents the molar amount of lithium carbonate in the raw material before sintering.

[0009] Furthermore, the second data includes: the electrical energy consumed in the processes of mixing, transporting, sintering, crushing, screening, iron removal and packaging of materials; the second formula is specifically:

[0010]

[0011] Among them, E 总 Indicates the total electrical energy consumed, E i It indicates the electric energy consumed in the processes of material mixing, transportation, sintering, crushing, screening, iron removal and packaging.

[0012] Furthermore, the third data includes: the type and quantity of raw materials, water vapor directly discharged during the sintering process, carbon dioxide directly discharged during the sintering process, and carbon emission conversion coefficients corresponding to different substances;

[0013] The third formula is specifically:

[0014] C 总 =C yc +C 电 +C 水 +C 碳 +C Li损 ;

[0015] Among them, C 总 Represents the total carbon emissions, C yc Indicates the carbon emissions from raw material manufacturing, C 电 Indicates the carbon emissions converted from the total electricity consumed, C 水 Indicates the carbon emissions converted from the water vapor directly discharged during the sintering process; C 碳 Indicates the carbon dioxide directly discharged during the sintering process, C Li损 Represents carbon emissions converted from lithium loss.

[0016] Furthermore, the carbon emissions converted from the total electric energy consumed are specifically:

[0017] Calculate the carbon emissions caused by the electricity consumed based on the global warming potential of greenhouse gases.

[0018] Furthermore, the accounting system also includes a data entry module; the data entry module is used to enter the first data, the second data, the third data, the first formula, the second formula and the third formula.

[0019] Furthermore, the accounting system also includes a data output display module; the data output display module is used to output and display the accounting results.

[0020] Furthermore, the calculation system also includes an energy loss calculation module; the energy loss calculation module is used to read the fourth formula from the knowledge module and read the fourth data from the data module to calculate the energy loss during the sintering process.

[0021] Furthermore, the fourth data includes: sintering start time, sintering end time, heat exchange coefficient between the kiln and the outside, temperature of the roller kiln, external environment temperature and total power consumed by the roller kiln during the sintering process;

[0022] The fourth formula is specifically:

[0023]

[0024] Among them, E 损 Indicates the energy lost during sintering; t1 indicates the start time of sintering; t2 indicates the end time of sintering; ε indicates the heat exchange coefficient between the kiln and the outside world; T1 indicates the temperature of the roller kiln; T2 indicates the outside environment temperature; E 窑 It indicates the total electric energy consumed by the roller kiln during the sintering process.

[0025] Furthermore, the accounting system also includes an analysis module, which is used to obtain the energy loss calculated by the energy loss accounting module and the lithium element loss calculated by the material balance module, establish an analysis model based on the energy loss and lithium element loss, and determine the correlation coefficient between the energy loss and the lithium element loss.

[0026] Compared with the prior art, the carbon emission accounting system for sintering positive electrode materials of a lithium battery in an embodiment of the present invention has the following beneficial effects: the present invention fully considers the carbon emissions involved in the entire positive electrode material sintering process through the material balance module, the energy balance module and the carbon emission accounting module, and the overall carbon emissions can be calculated quickly and efficiently through the input data and the pre-stored calculation formula. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a carbon emission accounting system for sintering of a lithium battery positive electrode material according to the present invention;

[0028] Figure 2 It is a schematic diagram of the process of sintering a positive electrode material for a lithium battery according to the present invention. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] like Figure 1 As shown, the present invention discloses a carbon emission accounting system for sintering positive electrode materials of lithium batteries, comprising: a material balance module, an energy balance module, a carbon emission accounting module, a data module, and a knowledge module; the material balance module is used to read a first formula from the knowledge module and read first data from the data module to calculate the lithium element loss during the sintering process of the positive electrode materials of lithium batteries; the energy balance module is used to read a second formula from the knowledge module and read second data from the data module to calculate the energy loss during the sintering process of the positive electrode materials of lithium batteries; the carbon emission accounting module is used to read a third formula from the knowledge module and read third data from the data module, lithium element loss, and energy loss to calculate the carbon emission during the sintering process of the positive electrode materials of lithium batteries; the data module is used to store first data, second data, third data, and intermediate data generated in the accounting system; the knowledge module is used to store the first formula, the second formula, the third formula, and the parameter values ​​in the accounting process.

[0031] In the present invention, the carbon emissions involved in the entire positive electrode material sintering process are fully considered through the material balance module, energy balance module and carbon emission accounting module. The overall carbon emissions can be calculated quickly and efficiently through the input data and pre-stored calculation formulas.

[0032] In order to better illustrate the technical solution of the present invention, refer to Figure 2 Taking the sintering of NCM523 positive electrode material as an example, nickel cobalt manganese hydroxide with a molar ratio of nickel, cobalt and manganese of 5:2:3 is selected, and the chemical formula is Ni 0.5 Co 0.2 Mn 0.3 (OH)2; lithium carbonate is selected as the lithium source.

[0033] In this embodiment, the first data includes: the mass of the sagger after filling before sintering, the mass of the crystal water in the precursor, the mass of the sagger taken out of the furnace after sintering, the molar amount of the precursor in the raw material before sintering, and the molar amount of lithium carbonate in the raw material before sintering; the first formula is specifically:

[0034] M Li损 =M 前 -M 水 -M 后 -10a-44b;

[0035] Among them, M Li损 Indicates the loss of lithium element, M 前 Indicates the mass of the sagger before sintering, M 水 Indicates the mass of crystal water in the precursor, M 后 It represents the mass of the sagger taken out of the furnace after sintering, a represents the molar amount of the precursor in the raw material before sintering; b represents the molar amount of lithium carbonate in the raw material before sintering.

[0036] In this embodiment, the first data includes: the mass of the sagger after sintering, the precursor (Ni 0.5 Co 0.2 Mn 0.3 The quality of the crystal water in the raw material (OH)2), the quality of the sagger after sintering, the quality of the precursor (Ni 0.5 Co 0.2 Mn 0.3 The molar amount of (OH)2) and the molar amount of lithium carbonate in the raw material before sintering.

[0037] In this embodiment, the material changes during the sintering process are as follows: at 100-200°C, the precursor loses crystal water; at 400°C, the precursor hydroxide dehydrates to form an oxide; at 500°C, lithium carbonate decomposes to form lithium oxide; at 700°C, the precursor oxide reacts with lithium oxide to form lithium nickel cobalt manganese oxide.

[0038] Weigh a mol of nickel cobalt manganese hydroxide precursor and b mol of lithium carbonate, mix them, and sinter them in an oxygen atmosphere. The precursor and lithium carbonate will react in a 1:1 ratio to form a nickel cobalt manganese oxide positive electrode material; part of the excess lithium remains on the surface of the positive electrode material in the form of lithium oxide, and the other part enters the external environment in the form of lithium oxide with the air flow, thus causing carbon emissions. The reaction equation is as follows:

[0039] O2+4Me(OH)2+2Li2CO3==4LiMe O2+4H2O+2CO2;

[0040] Me is Ni, Co, Mn. M 前 It indicates the mass of the sagger before sintering, which is the total mass of the sagger and the mixed material. 后 It indicates the mass of the sagger taken out of the furnace after sintering, which is the total mass of the sagger, lithium nickel cobalt manganese oxide and residual lithium.

[0041] During the sintering process, the mass of water discharged is the mass of crystallization water plus the mass of water produced by the reaction, that is, M 水 +amol water, b mol carbon dioxide, a / 4mol oxygen participating in the reaction, therefore, the mass of lithium lost (in terms of Li2O) is M 前 -M 后 -M 水-a mol water -b mol carbon dioxide +a / 4 mol oxygen, we get the following formula:

[0042] M Li损 =M 前 -M 水 -M 后 -10a-44b.

[0043] In this embodiment, the second data includes: the electrical energy consumed in each of the processes of material mixing, transportation, sintering, crushing, screening, iron removal, and packaging; the second formula is specifically:

[0044]

[0045] Among them, E 总 Indicates the total electrical energy consumed, E i It indicates the electric energy consumed in the processes of material mixing, transportation, sintering, crushing, screening, iron removal and packaging.

[0046] In this embodiment, the third data includes: the type and quantity of raw materials, water vapor directly discharged during the sintering process, carbon dioxide directly discharged during the sintering process, and carbon emission conversion coefficients corresponding to different substances;

[0047] The third formula is specifically:

[0048] C 总 =C yc +C 电 +C 水 +C 碳 +C Li损 ;

[0049] Among them, C 总 Represents the total carbon emissions, C yc Indicates the carbon emissions from raw material manufacturing, C 电 Indicates the carbon emissions converted from the total electricity consumed, C 水 Indicates the carbon emissions converted from the water vapor directly discharged during the sintering process; C 碳 Indicates the carbon dioxide directly discharged during the sintering process, C Li损 Represents carbon emissions converted from lithium loss.

[0050] In this embodiment, the raw materials include: a precursor, lithium carbonate, and oxygen.

[0051] In this embodiment, the amount of lithium loss can be calculated by the molar amount of the precursor and lithium carbonate (which can be obtained by weighing before mixing) and the mass of the sagger before and after sintering after filling; the oxygen consumption can be obtained by the oxygen flow meter; by looking up the carbon emission factor, the carbon emissions of raw materials such as precursor, lithium carbonate, oxygen, total power consumption, water vapor emissions, carbon dioxide emissions, lithium loss emissions, etc. can be converted; finally, the total carbon emissions are obtained.

[0052] In this embodiment, the carbon emissions converted from the total consumed electrical energy are specifically:

[0053] Calculate the carbon emissions caused by the electricity consumed based on the global warming potential of greenhouse gases.

[0054] In this embodiment, the accounting system further includes a data entry module; the data entry module is used to enter the first data, the second data, the third data, the first formula, the second formula and the third formula.

[0055] In this embodiment, the data inputted by the data input module includes: accurately weighing x kg of precursor with a water content of 0.5%, i.e., a mol Ni 0.5 Co 0.2 Mn 0.3 (OH)2, 0.005x kg of crystal water; accurately weigh y kg of lithium carbonate, i.e. b mol of lithium carbonate; the electricity consumed for mixing is E1, the electricity consumed for transportation is E2, the electricity consumed for sintering is E3..., the data is derived from the electric meter for input; the mass of the sagger after filling before sintering is recorded as M1; the mass of the sagger after sintering is recorded as M2; the oxygen used in the sintering process is derived from the flow meter for input; the water content of 0.5% Ni 0.5 Co 0.2 Mn 0.3 Carbon emission factor of (OH)2, carbon emission factor of lithium carbonate, carbon emission factor of oxygen, carbon emission factor of electricity conversion, carbon emission factor of water vapor, and carbon emission factor of lithium oxide.

[0056] In this embodiment, the accounting system further includes a data output and display module; the data output and display module is used to output and display the accounting results.

[0057] In this embodiment, the output displayed includes:

[0058] M Li损 =M1-0.005x-M2-10a-44b;

[0059] E 总 =E1+E2+E3+…;

[0060] C 总 =C yc+C 电 +C 水 +C 碳 +C Li损 ;

[0061]

[0062] In this embodiment, the calculation system further includes an energy loss calculation module; the energy loss calculation module is used to read the fourth formula from the knowledge module and the fourth data from the data module to calculate the energy loss during the sintering process.

[0063] In this embodiment, the fourth data includes: sintering start time, sintering end time, heat exchange coefficient between the kiln and the outside, temperature of the roller kiln, external environment temperature and total power consumed by the roller kiln during the sintering process.

[0064] The fourth formula is specifically:

[0065]

[0066] Among them, E 损 Indicates the energy lost during sintering; t1 indicates the start time of sintering; t2 indicates the end time of sintering; ε indicates the heat exchange coefficient between the kiln and the outside world; T1 indicates the temperature of the roller kiln; T2 indicates the outside environment temperature; E 窑 It indicates the total electric energy consumed by the roller kiln during the sintering process.

[0067] In this embodiment, the accounting system also includes an analysis module, which is used to obtain the energy loss calculated by the energy loss accounting module and the lithium element loss calculated by the material balance module, establish an analysis model based on the energy loss and lithium element loss, and determine the correlation coefficient between the energy loss and lithium element loss.

[0068] In summary, compared with the prior art, the carbon emission accounting system for sintering positive electrode materials of lithium batteries in an embodiment of the present invention has the following beneficial effects: the present invention fully considers the carbon emissions involved in the entire positive electrode material sintering process through the material balance module, the energy balance module and the carbon emission accounting module, and the overall carbon emissions can be calculated quickly and efficiently through the input data and the pre-stored calculation formula.

[0069] The present invention further adds an energy loss calculation module during the sintering process, which can study the influence of the change of roller kiln temperature in the heating stage and the insulation stage on lithium loss, thereby exploring the best sintering process, further reducing lithium loss and reducing carbon emissions.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A system for calculating carbon emissions from sintering of lithium battery positive electrode materials, characterized in that: include: Material balance module, energy balance module, carbon emission accounting module, data module, knowledge module; the material balance module is used to read the first formula from the knowledge module and the first data from the data module to calculate the lithium element loss during the sintering process of the positive electrode material of the lithium battery; the energy balance module is used to read the second formula from the knowledge module and the second data from the data module to calculate the energy loss during the sintering process of the positive electrode material of the lithium battery; the carbon emission accounting module is used to read the third formula from the knowledge module and the third data from the data module, the lithium element loss, and the energy loss to calculate the carbon emissions during the sintering process of the positive electrode material of the lithium battery; the data module is used to store the first data, the second data, and the third data. The data and intermediate data generated in the accounting system; the knowledge module is used to store the first formula, the second formula, the third formula and the parameter values ​​in the accounting process; the first data include the mass of the sagger after filling before sintering, the mass of the crystallization water in the precursor, the mass of the sagger out of the furnace after sintering, the molar amount of the precursor in the raw material before sintering and the molar amount of lithium carbonate in the raw material before sintering; the second data include the electric energy consumed in the mixing, transportation, sintering, crushing, screening, iron removal and packaging of the materials; the third data include the type and quantity of raw materials, the water vapor directly discharged during the sintering process, the carbon dioxide directly discharged during the sintering process and the carbon emission conversion coefficient corresponding to different substances.

2. The carbon emission accounting system for sintering of lithium battery positive electrode materials according to claim 1, characterized in that: The first formula is specifically: M Li损 =M 前 -M 水 -M 后 -10a-44b; Among them, M Li损 Indicates the loss of lithium element, M 前 Indicates the mass of the sagger before sintering, M 水 represents the mass of crystal water in the precursor, M represents the mass of the sagger after sintering, a represents the molar amount of the precursor in the raw material before sintering; b represents the molar amount of lithium carbonate in the raw material before sintering.

3. The carbon emission accounting system for sintering of lithium battery positive electrode materials according to claim 1, characterized in that: The second formula is specifically: Among them, Etotal represents the total electrical energy consumed, and Ei represents the electrical energy consumed in the processes of material mixing, transportation, sintering, crushing, screening, iron removal and packaging.

4. The carbon emission accounting system for sintering of lithium battery positive electrode materials according to claim 1, characterized in that: The third formula is specifically: C 总 =C yc +C 电 +C 水 +C 碳 +C Li损 ; Among them, Ctotal represents the total carbon emissions, Cyc represents the carbon emissions generated by raw material manufacturing, Celectricity represents the carbon emissions converted from the total electricity consumed, Cwater represents the carbon emissions converted from the water vapor directly discharged during the sintering process; Ccarbon represents the carbon dioxide directly discharged during the sintering process, and CLiloss represents the carbon emissions converted from lithium loss.

5. The carbon emission accounting system for sintering of lithium battery positive electrode materials according to claim 4, characterized in that: The carbon emissions converted from the total electric energy consumed are specifically: Calculate the carbon emissions caused by the electricity consumed based on the global warming potential of greenhouse gases.

6. The carbon emission accounting system for sintering of lithium battery positive electrode materials according to claim 1, characterized in that: The accounting system also includes a data entry module; the data entry module is used to enter the first data, the second data, the third data, the first formula, the second formula and the third formula.

7. The carbon emission accounting system for sintering of lithium battery positive electrode materials according to claim 1, characterized in that: The accounting system also includes a data output display module; the data output display module is used to output and display the accounting results.

8. The carbon emission accounting system for sintering of lithium battery positive electrode materials according to claim 1, characterized in that: The calculation system also includes an energy loss calculation module; the energy loss calculation module is used to read the fourth formula from the knowledge module and the fourth data from the data module to calculate the energy loss in the sintering process.

9. A carbon emission accounting system for sintering of lithium battery positive electrode materials according to claim 8, characterized in that: The fourth data includes: sintering start time, sintering end time, heat exchange coefficient between the kiln and the outside, temperature of the roller kiln, external environment temperature and total power consumed by the roller kiln during the sintering process; The fourth formula is specifically: Among them, E loss represents the energy lost during the sintering process; t1 represents the start time of sintering; t2 represents the end time of sintering; ε represents the heat exchange coefficient between the kiln and the outside world; T1 represents the temperature of the roller kiln; T2 represents the external ambient temperature; E kiln represents the total electrical energy consumed by the roller kiln during the sintering process.

10. The carbon emission accounting system for sintering of lithium battery positive electrode materials according to claim 8, characterized in that: The accounting system also includes an analysis module, which is used to obtain the energy loss calculated by the energy loss accounting module and the lithium element loss calculated by the material balance module, establish an analysis model based on the energy loss and the lithium element loss, and determine the correlation coefficient between the energy loss and the lithium element loss.

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