CN114397219A - Infiltration duration measuring and calculating method and device - Google Patents
Infiltration duration measuring and calculating method and device Download PDFInfo
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- CN114397219A CN114397219A CN202210087705.6A CN202210087705A CN114397219A CN 114397219 A CN114397219 A CN 114397219A CN 202210087705 A CN202210087705 A CN 202210087705A CN 114397219 A CN114397219 A CN 114397219A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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Abstract
The invention discloses a method and a device for measuring and calculating infiltration duration, and relates to the field of batteries. The infiltration duration measuring and calculating method comprises the following steps: injecting electrolyte into the battery to be tested and then standing the battery to be tested; sampling a pole piece of the battery to be tested at intervals of preset time to obtain a pole piece to be tested; carrying out electrolyte removal treatment on the pole piece to be detected, and acquiring a weight difference value of the pole piece to be detected before and after the electrolyte removal; calculating the difference of the weight difference values of the two pole pieces to be measured obtained by adjacent sampling to obtain a comparison value, and comparing the comparison value with a preset parameter; stopping sampling under the condition that the comparison value is less than or equal to the preset parameter, and calculating the total time length passed by the previous sampling of the two corresponding pole pieces to be detected to obtain the infiltration time length of the battery to be detected. The method for measuring and calculating the soaking time provided by the invention can accurately measure and calculate the soaking time required by the battery, and improves the efficiency and yield of battery preparation.
Description
Technical Field
The invention relates to the field of batteries, in particular to a method and a device for measuring and calculating infiltration duration.
Background
In the manufacturing process of the lithium battery, formation charging can be carried out only by soaking the interior of the battery with electrolyte, the pole piece is not soaked fully due to insufficient soaking time, the performance of the battery is poor, and the production efficiency is affected due to too long soaking time.
At present, in the manufacturing process of lithium batteries, the soaking time of the batteries is generally determined by operators according to experience, and is very inaccurate.
Disclosure of Invention
The invention aims to provide a method for measuring and calculating infiltration duration, which can accurately measure and calculate the infiltration duration required by a battery.
Another object of the present invention is to provide an immersion time measuring and calculating device, which can accurately measure and calculate the immersion time required by a battery.
The invention provides a technical scheme that:
a method for measuring and calculating infiltration duration comprises the following steps:
injecting electrolyte into a battery to be tested and then standing the battery to be tested;
sampling the pole piece of the battery to be tested every other preset time to obtain a pole piece to be tested;
carrying out electrolyte removal treatment on the pole piece to be detected, and acquiring a weight difference value of the pole piece to be detected before and after the electrolyte removal;
calculating the difference of the weight difference values of the two pole pieces to be detected obtained by adjacent sampling to obtain a comparison value, and comparing the comparison value with a preset parameter;
stopping sampling under the condition that the comparison value is less than or equal to the preset parameter, and calculating the total time length passed by the previous sampling in the two corresponding pole pieces to be detected to obtain the infiltration time length of the battery to be detected.
Further, the step of removing the electrolyte from the pole piece to be tested and obtaining the weight difference value of the pole piece to be tested before and after removing the electrolyte comprises:
weighing the pole piece to be detected obtained by sampling to obtain an initial weight;
heating the pole piece to be detected, and monitoring the weight data of the pole piece to be detected in real time;
under the condition that the weight data of the pole piece to be detected are kept constant, reading the weight data of the pole piece to be detected to obtain the drying weight;
and calculating the difference between the initial weight and the drying weight to obtain the weight difference value.
Further, the step of calculating the total elapsed time of the previous sampling of the two corresponding pole pieces to be tested to obtain the soaking time of the battery to be tested comprises:
and calculating the sum of a plurality of preset durations which pass through when the previous one of the two pole pieces to be detected is sampled, so as to obtain the soaking duration.
The invention also provides a device for measuring and calculating the infiltration duration, which comprises a weighing part and a heating part, wherein the heating part is arranged on the weighing part, the heating part is used for bearing a pole piece to be measured and heating the pole piece to be measured so as to evaporate the pole piece to be measured and remove the electrolyte, and the weighing part is used for weighing the weight of the pole piece to be measured before and after the electrolyte is removed.
Further, the infiltration duration measuring and calculating device further comprises a heat insulation piece, and the heat insulation piece is arranged between the heating piece and the weighing piece.
Further, the infiltration duration measuring and calculating device further comprises a heating bin, and the weighing piece and the heating piece are contained in the heating bin.
Furthermore, a cabin door capable of being selectively opened is arranged on the side wall of the heating cabin.
Further, still be provided with the dehumidification on the lateral wall of heating bunker and filter the piece, the inside of heating bunker is passed through dehumidification filters piece and external trachea intercommunication.
Further, the infiltration duration measuring and calculating device further comprises an exhaust fan, and the exhaust fan is communicated with the interior of the heating bin through a pipeline.
Further, the infiltration duration measuring and calculating device further comprises a gas recovery piece, and the gas recovery piece is arranged on a pipeline communicated with the exhaust fan and the heating bin.
Compared with the prior art, the infiltration duration measuring and calculating method provided by the invention has the advantages that the battery to be tested which is placed still after being injected with the electrolyte is sampled for multiple times, and the electrolyte removal treatment is carried out on the sampled pole piece to be tested after each sampling, so that the weight difference before and after the electrolyte is removed is obtained. And after the weight difference value of the current pole piece to be detected is obtained, performing difference value calculation on the weight difference value of the pole piece to be detected sampled at the previous time to obtain a comparison value. And under the condition that the comparison value is less than or equal to the preset parameter, representing that the pole piece to be tested sampled at this time absorbs less electrolyte than the pole piece to be tested sampled at the previous time, indicating that the battery is fully soaked during the previous sampling, and calculating the total time length during the previous sampling to obtain the soaking time length of the battery to be tested. Therefore, the infiltration duration measuring and calculating method provided by the invention has the beneficial effects that: the method can accurately measure and calculate the required soaking time of the battery, and improves the battery preparation efficiency and the yield.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.
Fig. 1 is a flowchart of a method for measuring and calculating an infiltration duration according to an embodiment of the present invention;
FIG. 2 is a block flow diagram illustrating the sub-steps of step S103 in FIG. 1;
fig. 3 is a schematic structural diagram of an infiltration duration measuring device according to an embodiment of the present invention.
Icon: 100-a device for measuring and calculating infiltration duration; 110-a weighing member; 120-a heating element; 130-insulation; 140-a heating chamber; 141-door of the bin; 142-a dehumidifying filter; 150-an exhaust fan; 160-gas recovery.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Examples
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for measuring and calculating an infiltration duration according to the present embodiment, where the method for measuring and calculating an infiltration duration includes the following steps:
and S101, injecting electrolyte into the battery to be tested, and then standing the battery to be tested.
It can be understood that, the battery to be tested in this embodiment is one of the batteries in the same batch model, and the soaking duration of the battery to be tested is measured and calculated, so that the soaking duration of other batteries in the same batch of batteries in the same batch model can be obtained, and uniform soaking is facilitated.
Further, the immersion time duration measuring and calculating method may further include:
and S102, sampling the pole piece of the battery to be tested every preset time to obtain the pole piece to be tested.
The preset time length is selected according to specific application conditions, the next sampling is carried out after the step S103 and the step S104 are completed after each sampling and the step S105 is selectively completed, and the preset time length is arranged between two adjacent sampling.
Further, the immersion time duration measuring and calculating method may further include:
step S103, electrolyte removing processing is carried out on the pole piece to be detected, and a weight difference value before and after the electrolyte removing processing is carried out on the pole piece to be detected is obtained.
It can be understood that before the step S103 is executed, namely, after the pole piece to be measured is obtained by sampling, the electrolyte on the surface of the pole piece to be measured is first wiped clean, so as to ensure that the electrolyte removing process in the step S103 is to remove the electrolyte which has infiltrated into the inside of the pole piece to be measured, so as to ensure the accuracy of the measurement result.
And obtaining the weight difference value of the pole piece to be detected before and after the electrolyte is removed, and obtaining the quality of the electrolyte immersed in the pole piece to be detected.
Referring to fig. 2, fig. 2 is a flow chart illustrating a sub-step of step S103, wherein step S103 may include the following sub-steps:
and a substep S1031, weighing the pole piece to be measured obtained by sampling to obtain an initial weight.
The initial weight refers to the sum of the weight of the pole piece to be tested and the weight of the electrolyte immersed in the pole piece to be tested.
And a substep S1032 of heating the pole piece to be detected and monitoring the weight data of the pole piece to be detected in real time.
In this embodiment, adopt the mode of drying to get rid of the electrolyte that the pole piece that awaits measuring immerges, realize the evaporation to electrolyte to the pole piece that awaits measuring, in other embodiments, can also adopt other modes to get rid of the electrolyte that the pole piece that awaits measuring immerges according to practical application condition.
And a substep S1033, reading the weight data of the pole piece to be detected under the condition that the weight data of the pole piece to be detected is kept constant, and obtaining the drying weight.
In the process of heating the pole piece to be tested, the electrolyte to be tested and immersed into the pole piece to be tested can be gradually evaporated, and the weight of the pole piece to be tested can be gradually reduced. Under the condition that the weight data of the pole piece to be detected is kept constant, the electrolyte immersed into the pole piece to be detected is basically evaporated completely, and the weight data of the pole piece to be detected refers to the weight of the pole piece to be detected after the electrolyte is removed.
And a substep S1034 of calculating the difference between the initial weight and the drying weight to obtain a weight difference value.
Referring to fig. 1, the method for measuring the immersion time may further include:
and step S104, calculating the difference of the weight difference values of the two pole pieces to be detected obtained by adjacent sampling to obtain a comparison value, and comparing the comparison value with a preset parameter.
In the process of battery infiltration, before the pole piece is not saturated, the amount of electrolyte immersed into the pole piece is gradually increased along with the increase of infiltration time, and the weight difference value between the pole pieces to be tested sampled twice in the process is larger, namely the comparison value is larger. The preset parameters are preset according to the actual application condition and are basically near zero values.
Further, the immersion time duration measuring and calculating method may further include:
and step S105, stopping sampling under the condition that the comparison value is less than or equal to the preset parameter, and calculating the total time length passed by the previous sampling in the two corresponding pole pieces to be detected to obtain the infiltration time length of the battery to be detected.
When the comparison value is less than or equal to the preset parameter, representing that the weight difference value before and after the drying of the pole piece to be detected sampled at this time is close to the weight difference value before and after the drying of the pole piece to be detected sampled at the previous time, representing that the pole piece of the battery is basically in an electrolyte saturation state when the sampling is carried out at the previous time, namely judging that the soaking is finished when the sampling is carried out at the previous time. Therefore, the steps S102, S103 and S104 are stopped, and the sum of the preset durations that have elapsed during the previous sampling is calculated to obtain the soaking duration.
In summary, in the method for measuring and calculating the infiltration duration provided by this embodiment, the battery to be measured is sampled at intervals of the preset duration, the electrolyte is removed, the weight difference before and after the electrolyte is removed is calculated, the difference is obtained from the weight difference of the electrode piece to be measured sampled at the previous time to obtain the comparison value, the comparison value is compared with the preset parameter, and the infiltration completion time is determined according to the comparison result, so as to obtain the infiltration duration. Compared with the prior art, the method has the advantages that the soaking time is determined empirically, the method is more accurate, the battery performance is guaranteed, and the production efficiency is improved.
Referring to fig. 3, the present embodiment further provides an immersion time measuring device 100, and fig. 3 is a schematic structural diagram of the immersion time measuring device 100.
The immersion time measuring and calculating device 100 of the present embodiment is used for measuring and calculating the immersion time of a battery, and is actually mainly used for executing the step S103 of the immersion time measuring and calculating method.
The immersion time measuring device 100 of the present embodiment includes a weighing member 110, a heating member 120, a heat insulating member 130, a heating chamber 140, an exhaust fan 150, and a gas recycling member 160.
The weighing member 110 is disposed in the heating chamber 140, the heat insulating member 130 is disposed on the heating chamber 140, the heating member 120 is disposed on the heat insulating member 130, and the heating member 120 is used for carrying a pole piece to be tested and heating the pole piece to be tested. The heat insulation member 130 plays a role in isolating the weighing member 110 from the heating member 120, the weighing member 110 weighs the heat insulation member 130, the heating member 120 and the pole piece to be measured, and the weight of the heat insulation member 130 and the heating member 120 is peeled off to obtain the weight data of the pole piece to be measured.
The side wall of the heating chamber 140 is provided with a chamber door 141 capable of being selectively opened, the sampled pole piece to be tested is placed in by opening the chamber door 141, and the chamber door 141 is closed in the process of heating the pole piece to be tested. The exhaust fan 150 is communicated with the interior of the heating bin 140 through a pipeline, the gas recovery member 160 is arranged on the pipeline through which the exhaust fan 150 is communicated with the heating bin 140, the side wall of the heating bin 140 is also provided with a dehumidifying filter 142, and the interior of the heating bin 140 is communicated with an external air pipe through the dehumidifying filter 142.
In fact, in step S103 of the aforementioned method for measuring and calculating infiltration duration, after the sampled electrolyte attached to the surface of the pole piece to be measured is wiped clean, the pole piece to be measured is placed on the heating element 120 in the heating chamber 140, and the weighing data of the weight piece after peeling is read, so as to obtain the initial weight of the pole piece to be measured. Then closing the bin gate 141, opening the heating element 120 to heat the pole pieces to be tested, so that the pole pieces to be tested can evaporate the electrolyte, introducing nitrogen into the heating bin 140 through the initial filtering element, starting the exhaust fan 150, and recycling the electrolyte components evaporated into the air by mixing the nitrogen and pumping the electrolyte components into the gas recycling element 160 to avoid environmental pollution.
In the process of heating the pole piece to be measured, the weighing part 110 monitors the weight data of the pole piece to be measured in real time, when the weight data of the pole piece to be measured is kept constant, namely, when the weight data is not changed any more, the weight data is read to obtain the drying weight, and the drying weight represents the weight of the pole piece to be measured after the electrolyte is removed.
The battery to be tested is sampled for multiple times at intervals with preset time length, the pole piece to be tested sampled every time is subjected to electrolyte removal and initial loading and drying weight weighing through the soaking time length measuring and calculating device 100 provided by the embodiment, and then the weight difference value of the pole piece to be tested is obtained by calculating the difference value of the initial weight and the drying weight. And then, the weight difference value of the pole piece to be detected sampled every time is subtracted from the weight difference value of the pole piece to be detected sampled at the previous time to obtain a comparison value, and the pole piece saturation time of the battery to be detected is judged according to the comparison value, so that the saturation time of the battery to be detected is obtained.
Therefore, the device 100 for measuring and calculating the soaking time provided by the embodiment is used for measuring and calculating the soaking time of the battery to be measured, and accurately obtaining the time for completing the soaking of the battery, thereby ensuring the performance of the battery and improving the production efficiency.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for measuring and calculating infiltration duration is characterized by comprising the following steps:
injecting electrolyte into a battery to be tested and then standing the battery to be tested;
sampling the pole piece of the battery to be tested every other preset time to obtain a pole piece to be tested;
carrying out electrolyte removal treatment on the pole piece to be detected, and acquiring a weight difference value of the pole piece to be detected before and after the electrolyte removal;
calculating the difference of the weight difference values of the two pole pieces to be detected obtained by adjacent sampling to obtain a comparison value, and comparing the comparison value with a preset parameter;
stopping sampling under the condition that the comparison value is less than or equal to the preset parameter, and calculating the total time length passed by the previous sampling in the two corresponding pole pieces to be detected to obtain the infiltration time length of the battery to be detected.
2. The immersion time measuring and calculating method according to claim 1, wherein the step of performing electrolyte removal processing on the pole piece to be measured and obtaining the weight difference value of the pole piece to be measured before and after the electrolyte removal processing comprises:
weighing the pole piece to be detected obtained by sampling to obtain an initial weight;
heating the pole piece to be detected, and monitoring the weight data of the pole piece to be detected in real time;
under the condition that the weight data of the pole piece to be detected are kept constant, reading the weight data of the pole piece to be detected to obtain the drying weight;
and calculating the difference between the initial weight and the drying weight to obtain the weight difference value.
3. The method for measuring and calculating the soaking time length according to claim 1, wherein the step of calculating the total time length passed by the previous sampling of the two corresponding pole pieces to be measured to obtain the soaking time length of the battery to be measured comprises the following steps:
and calculating the sum of a plurality of preset durations which pass through when the previous one of the two pole pieces to be detected is sampled, so as to obtain the soaking duration.
4. The utility model provides a length measuring device when soaking, its characterized in that, including weighing member and heating member, the heating member set up in on the weighing member, the heating member is used for bearing the pole piece that awaits measuring, and is right the pole piece that awaits measuring heats, so that the pole piece that awaits measuring evaporates and gets rid of electrolyte, the weighing member is used for weighing the weight of pole piece that awaits measuring before getting rid of electrolyte.
5. The immersion time duration measuring and calculating device according to claim 4, further comprising a heat insulating member disposed between the heating member and the weighing member.
6. The immersion time measuring and calculating device as claimed in claim 4, further comprising a heating chamber, wherein the weighing member and the heating member are accommodated in the heating chamber.
7. The immersion time measuring and calculating device according to claim 6, wherein a selectively openable door is provided on a side wall of the heating chamber.
8. The device for measuring and calculating infiltration duration according to claim 6, wherein a dehumidifying filter is further disposed on the side wall of the heating chamber, and the inside of the heating chamber is communicated with the external air pipe through the dehumidifying filter.
9. The immersion time duration measuring and calculating device according to claim 6, further comprising an exhaust fan, wherein the exhaust fan is communicated with the interior of the heating chamber through a pipeline.
10. The immersion time measuring and calculating device according to claim 9, further comprising a gas recovery member disposed on a pipe connecting the exhaust fan and the heating chamber.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115856658A (en) * | 2022-12-13 | 2023-03-28 | 蜂巢能源科技(马鞍山)有限公司 | Battery infiltration time detection method and device, electronic equipment and storage medium |
| CN116008117A (en) * | 2023-03-28 | 2023-04-25 | 宁德时代新能源科技股份有限公司 | Battery infiltration test method, test equipment, device and computer equipment |
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