CN219321379U - Pole piece, battery core and battery - Google Patents
Pole piece, battery core and battery Download PDFInfo
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- CN219321379U CN219321379U CN202320196180.XU CN202320196180U CN219321379U CN 219321379 U CN219321379 U CN 219321379U CN 202320196180 U CN202320196180 U CN 202320196180U CN 219321379 U CN219321379 U CN 219321379U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a pole piece, an electric core and a battery, wherein the pole piece comprises: the first potential detection component, the current collector and the multilayer coating layer are arranged on the current collector in a laminated mode, part of the first potential detection component is clamped between the adjacent coating layers, so that the voltage between the first potential detection component and the current collector can be detected, the amount of electrolyte immersed into the pole piece is analyzed through the change of the voltage, the degree of immersion of the electrolyte in the pole piece and the consumption degree of the electrolyte are determined, measures are timely taken when the lack of the electrolyte occurs in the pole piece, the use of a battery is avoided, and the safety of the battery is improved.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a pole piece, an electric core and a battery.
Background
With the rapid development of related technologies of lithium ion batteries, higher requirements are put forward on performances such as service life, quick charge, low temperature and safety of the lithium ion batteries, the four performances are closely related to the internal non-uniform reaction of the lithium ion batteries, wherein the internal non-uniform reaction easily causes the problems of local electrolyte shortage and the like of the internal electrolyte, the electrolyte shortage is mainly divided into two types, one type is small in electrolyte inflow amount, the other type is quick in electrolyte consumption, and the service life and safety of the lithium ion batteries can be influenced by the electrolyte shortage caused by whichever type. Therefore, monitoring the degree of electrolyte wetting and consumption is particularly important.
Disclosure of Invention
The embodiment of the utility model provides a pole piece, an electric core and a battery, which are used for monitoring the infiltration degree and the consumption degree of electrolyte in the pole piece.
In a first aspect, an embodiment of the present utility model provides a pole piece, including: a current collector, a multilayer coating and a first potential detection component;
each of the coating stacks is disposed over the current collector, with portions of the first potential sensing component being sandwiched between adjacent ones of the coatings, the first potential sensing component being disposed in isolation from the current collector.
In a second aspect, an embodiment of the present utility model provides a battery cell, including: the lithium ion battery comprises a positive pole piece, a negative pole piece and a diaphragm positioned between the positive pole piece and the negative pole piece;
at least one of the positive electrode sheet and the negative electrode sheet is as described in the first aspect above.
In a third aspect, an embodiment of the present utility model provides a battery including: an electrolyte and a cell as described in the second aspect above, the cell being immersed in the electrolyte.
The utility model has the following beneficial effects:
the embodiment of the utility model provides a pole piece, an electric core and a battery, wherein the pole piece comprises: the first potential detection component, the current collector and the multilayer coating layer are arranged on the current collector in a laminated mode, part of the first potential detection component is clamped between the adjacent coating layers, so that the voltage between the first potential detection component and the current collector can be detected, the amount of electrolyte immersed into the pole piece is analyzed through the change of the voltage, the degree of immersion of the electrolyte in the pole piece and the consumption degree of the electrolyte are determined, measures are timely taken when the lack of the electrolyte occurs in the pole piece, the use of a battery is avoided, and the safety of the battery is improved.
Drawings
Fig. 1 is a schematic structural diagram of a pole piece according to an embodiment of the present utility model;
FIG. 2 is a schematic view of another pole piece according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of another battery cell according to an embodiment of the present utility model;
fig. 5 is a schematic structural diagram of another battery cell according to an embodiment of the present utility model;
FIG. 6 is a schematic illustration of an electrolyte infiltration process provided in an embodiment of the present utility model;
FIG. 7 is a graph of voltage versus time provided in an embodiment of the present utility model;
FIG. 8 is a graph of voltage, capacity retention versus cycle number provided in an embodiment of the present utility model;
fig. 9 is a schematic structural diagram of a battery according to an embodiment of the present utility model.
Reference numerals:
10-current collector, 20-coating, 31-first potential detection component, 32-second potential detection component, 100-battery cell, 110-positive pole piece, 120-negative pole piece, 130-diaphragm, 210-shell, 220-cover plate, 221-liquid injection hole, 222-explosion-proof valve and 230-accommodation space.
Detailed Description
Specific embodiments of a pole piece, a battery cell and a battery provided by the embodiment of the utility model will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
An embodiment of the present utility model provides a pole piece, as shown in fig. 1 and fig. 2, including:
a multi-layer coating 20; wherein the coating 20 may be provided with two layers as shown in fig. 1; or the coating 20 may also be provided with more than two layers, such as three layers (as shown in fig. 2), four layers, or more. The coating 20 may include: active materials, binders, and materials that provide a transmission path for intercalation and deintercalation of lithium ions when the electrode sheet is applied to a lithium ion battery, etc. that participate in chemical reactions, lithium ions can be intercalated and deintercalated in the coating layer 20, thereby realizing impregnation of an electrolyte into the coating layer 20;
first potential detection element 31, first potential detection element 31 may be, but is not limited to being, a reference electrode.
Each coating layer 20 is stacked on the current collector 10, and a portion of the first potential detecting element 31 (as shown in a dashed line frame 1 in fig. 1) is sandwiched between adjacent coating layers 20, so that the remaining portion of the first potential detecting element 31 (as shown in a dashed line frame 2 in fig. 1) protrudes out of the coating layer 20, and further, the portion protruding out of the coating layer 20 may be connected to a detecting device (not shown in fig. 1) so as to realize potential detection of the first potential detecting element 31. In addition, the first potential detecting element 31 needs to be insulated from the current collector 10, so as to avoid the functional failure of the first potential detecting element 31 caused by the short circuit between the first potential detecting element 31 and the current collector 10.
Thus, the voltage (namely the potential difference, in the embodiment of the utility model, the voltage and the potential difference can be used interchangeably) between the first potential detection component and the current collector can be detected, and the amount of the electrolyte immersed into the pole piece is analyzed through the change of the voltage, so that the degree of infiltration of the electrolyte in the pole piece and the consumption degree of the electrolyte are determined, measures are timely taken when the lack of the electrolyte occurs in the pole piece, the use of a battery is prevented from being influenced, and the safety of the battery is improved. In addition, as the first potential detection component is buried between the coatings, the influence of potential errors in the electrolyte can be reduced, and the detection result is more accurate and reliable.
In some embodiments, the first potential detecting component may be a copper wire, or a lithium-plated copper wire (i.e. the surface of the copper wire is plated with lithium), so that the voltage between the first potential detecting component and the current collector can be conveniently detected, thereby determining the infiltration degree of the electrolyte in the pole piece and the consumption degree of the electrolyte.
In some embodiments, the first potential detecting component may be wire-shaped, and the diameter may be not greater than 30 μm, so that the diameter of the first potential detecting component is set as small as possible, and further the coating is rolled uniformly, so that the occurrence of protrusions and coating dropping is avoided, and further adverse effects on the performance of the battery are avoided. The first potential detecting element is not limited to be wire-shaped, and may be of any other shape, but the maximum diameter is not more than 30 μm, and the diameters of the first potential detecting element may be the same or different, and may be set as needed.
In some embodiments, when two layers of coating 20 are provided, as shown in fig. 1, the first potential detecting element 31 may be provided one and sandwiched between the two layers of coating 20. When more than two layers of coating layers 20 are provided, for example, three layers of coating layers 20 are taken as an example, as shown in fig. 2, two first potential detecting components 31 may be provided, one first potential detecting component 31 is sandwiched between each adjacent coating layer 20, that is, one first potential detecting component 31 is sandwiched between the leftmost coating layer 20 and the middle coating layer 20, and another first potential detecting component 31 is sandwiched between the middle coating layer 20 and the rightmost coating layer 20.
Taking four layers of coatings as an example, and not giving illustration, when the four layers of coatings are sequentially marked as a first layer of coating, a second layer of coating, a third layer of coating and a fourth layer of coating according to the sequence of lamination, if two first potential detecting components are provided, the setting modes of the two first potential detecting components may include:
one of the first potential detecting components is arranged between the first coating layer and the second coating layer, and the other first potential detecting component is arranged between the second coating layer and the third coating layer or between the third coating layer and the fourth coating layer;
or, one of the first potential detecting components is arranged between the second layer coating and the third layer coating, and the other first potential detecting component is arranged between the first layer coating and the second layer coating, or between the third layer coating and the fourth layer coating;
or, one of the first potential detecting components is arranged between the third layer coating and the fourth layer coating, and the other first potential detecting component is arranged between the second layer coating and the third layer coating, or between the first layer coating and the second layer coating.
Of course, when four layers of coating layers are provided, the number of the first potential detecting means is not limited to two, and the number of the coating layers is not limited to three or four, which is only exemplified here.
Therefore, when the coating layer 20 is provided with n (n is an integer greater than 1) layers, the first potential detecting members 31 may be provided at most with n-1, and when the number of the first potential detecting members 31 provided is less than n-1, only the first potential detecting members 31 are provided between part of the adjacent coating layers 20, and the first potential detecting members 31 are not provided between part of the adjacent coating layers 20. And, for the adjacent coating layer 20 provided with the first potential detecting element 31: only one first potential detecting element 31 is provided between the adjacent coating layers 20.
Thus, a potential difference can be formed between the two first potential detecting components, when the potential difference is 0, the situation that the two first potential detecting components are immersed in the same or very close amounts of electrolyte is indicated, and the consumption of the electrolyte is very close. When the potential difference is not 0, the difference or the larger difference of the amounts of the electrolyte immersed in the positions of the two first potential detection assemblies is indicated, and then the difference and the consumption difference of the amounts of the electrolyte immersed in the positions of the two first potential detection assemblies can be judged by combining the potential difference between each first potential detection assembly and the current collector, so that the situation of the lack of the electrolyte is judged more easily.
And when the pole piece is a negative pole piece, the potential difference between the first potential detection component and the current collector is smaller than 0, which indicates that the position of the first potential detection component is likely to be subjected to lithium precipitation, so that measures can be taken in time, and dangerous occurrence is avoided.
In some embodiments, as shown in fig. 2, the difference (i.e., h1-h 2) between the length (e.g., h 1) of the portion of one first potential detecting element 31 located within the multilayer coating and the length (e.g., h 2) of the portion of the other first potential detecting element 31 located within the multilayer coating is not greater than a threshold value, which may be set to 0.5cm to 2cm, so that the lengths of the first potential detecting elements 31 that are sandwiched between the coatings 20 are more similar, and thus the amount of lithium ions that are attached to the first potential detecting elements 31 is more similar; since the more the amount of the attached lithium ions, the higher the corresponding potential is detected, and the less the amount of the attached lithium ions, the lower the corresponding potential is detected, so if the amount of the attached lithium ions is different due to different lengths, the amount of the electrolyte entering the positions where the two first potential detection components 31 are located may be very close to each other, so that the potential difference between the two first potential detection components is close to 0, but the final detection result is larger than the 0 deviation, thereby avoiding the interference on the detection result due to the difference of the attached lithium ions due to different lengths, and further improving the detection accuracy.
Based on the same inventive concept, the embodiment of the present utility model further provides a battery cell, as shown in fig. 3 and fig. 4, including: positive electrode tab 110, negative electrode tab 120, and separator 130 between positive electrode tab 110 and negative electrode tab 120; at least one of the positive electrode tab 110 and the negative electrode tab 120 is as described above in the embodiment of the present utility model.
Like this, through the detection to the voltage between first potential detection component and the mass flow body, can analyze the quantity of electrolyte that soaks into the polar plate (be provided with the pole piece of first potential detection component promptly) based on the change of voltage to confirm the infiltration degree of electrolyte in the pole piece and the consumption degree of electrolyte, in time take measures when appearing the lack of solution in the pole piece, avoid influencing the use and the quick charge of battery, improve the security that the battery used.
As shown in fig. 5 and fig. 6, when the cell is applied to a lithium ion battery, the driving force of electrolyte infiltration is capillary force according to the mass transfer theory of a porous medium, and the spontaneous imbibition process is adopted. Due to the blocking of the current collector, the electrolyte may permeate from the end face (part of the end face is shown in (b) of fig. 5, and (b) is a partially enlarged schematic view of the inner end face of the dashed frame 3 in (a)) of the cell (as shown in (a) through the separator 130, and the cell gap plays a role in diversion and the separator 130 plays a role in diversion, so that the electrolyte gradually enters into the coatings of the positive electrode tab 110 and the negative electrode tab 120, as shown by arrows in fig. 6. The process of impregnating the electrolyte inside the cell may include: (1) The electrolyte is transmitted in the gap between the positive electrode plate 110 and the diaphragm 130 and the gap between the negative electrode plate 120 and the diaphragm 130 under the action of capillary force; (2) Since the rate of infiltration of the electrolyte in the membrane 130 is much greater than in the coating, the electrolyte preferentially infiltrates in the pores of the membrane 130; (3) The electrolyte diffuses through the separator 130 to the positive electrode tab 110 and the negative electrode tab 120 on both sides and infiltrates into the coating.
Based on this, because the infiltration capacity or the climbing ability of electrolyte in the diaphragm is better, so the concentration of lithium ion in the diaphragm is relatively close to initial value, and inside different positions of positive pole piece (or negative pole piece) because electrolyte consumption and climbing ability have the difference, lead to the concentration of lithium ion that different positions are infiltrated to have the difference, there is concentration difference in this case between diaphragm and the inside of positive pole piece (or negative pole piece) to form concentration battery, through the potentiometre of different positions in the pole piece that monitoring is provided with first potentiometric detection subassembly, can judge the infiltration difference of electrolyte in the different positions in the pole piece.
Thus, in some embodiments, as shown in fig. 4, two diaphragms 130 are disposed in a stack between the positive electrode tab 110 and the negative electrode tab 120, and a second potential detection assembly 32 is disposed between the two diaphragms 130. The second potentiometric sensing component 32 may be, but is not limited to being, a reference electrode. Because the electrolyte infiltration capacity or the electrolyte climbing capacity of the diaphragm 130 is good, the concentration of lithium ions in the diaphragm 130 is relatively close to an initial value, the potential detected by the second potential detection assembly 32 can be used as a reference to detect the voltage between each first potential detection assembly 31 and each second potential assembly, and the electrolyte infiltration degree and the electrolyte consumption degree of the position of each first potential detection assembly 31 are analyzed through the detected voltage change, so that the real-time monitoring of the electrolyte distribution condition in the pole piece is realized.
In some embodiments, the structures of the first potential detecting component and the second potential detecting component may be set to be the same, and the lengths of the first potential detecting component and the second potential detecting component embedded into the battery core may be set to be the same or the difference between the lengths is not greater than a threshold value, and the threshold value may be set to be 0.5cm to 2cm, so that the lengths of the first potential detecting component and the second potential detecting component embedded into the battery core are very close, the difference is reduced, interference caused by the difference is avoided, and the detection accuracy is improved.
The process of monitoring the degree of wetting and the degree of consumption of the electrolyte is described below in connection with specific examples.
Examples: taking the example of monitoring the degree of infiltration.
1.1, manufacturing process of the battery cell:
take as an example a three-layer coating and two first potentiometric sensing elements.
Manufacturing a positive electrode plate: mixing an active material (such as lithium iron phosphate) of the positive electrode, a conductive agent and a binder according to a certain proportion to form positive electrode slurry, coating the positive electrode slurry on a current collector in a layered manner, wherein the positive electrode slurry with a certain thickness is used as a first layer coating, then, a copper wire is placed into the current collector to serve as a first potential detection component, the positive electrode slurry with a certain thickness is used as a second layer coating, then, a copper wire is placed into the current collector to serve as a second first potential detection component, then, the positive electrode slurry with a certain thickness is coated into a third layer coating, and the manufacturing of the positive electrode plate is completed through the procedures of rolling, drying and the like.
Manufacturing a negative electrode plate: this process is similar to the fabrication process of the positive electrode sheet and will not be described in detail herein. Wherein the active material of the negative electrode is graphite.
Manufacturing an electric core: and assembling the manufactured positive pole piece and the manufactured negative pole piece, separating the positive pole piece from the negative pole piece by using two layers of diaphragms, and placing a copper wire between the two layers of diaphragms as a second potential detection assembly to form the battery cell.
1.2, according to the principle:
monitoring the potential difference between each first potential detecting component and each second potential detecting component in the test process by adopting a multichannel recorder, and according to a Nernst equation DeltaU=RT/zFln (C1/C2), wherein DeltaU represents the potential difference, R represents the gas constant, T represents the temperature, F represents the Faraday constant, z represents the electron transfer quantity, C1 represents the quantity of electrolyte at the position of the first potential detecting component, C 2 And the amount of the electrolyte at the position of the second potential detection component is expressed, and the amount of the electrolyte at the position of each first potential detection component is estimated, so that the distribution condition and the liquid absorption capacity of the electrolyte in the pole piece are judged.
1.3, detection process:
the battery cell is assembled into a battery, a certain amount of electrolyte is injected at 25 ℃, a multichannel recorder is adopted to monitor the potential difference after the electrolyte injection, the monitoring result is shown in fig. 7, meanwhile, in combination with fig. 4, U1 represents the potential difference between a first potential detection component and a second potential detection component which are close to one side of a diaphragm in a positive pole piece, U2 represents the potential difference between the first potential detection component and the second potential detection component which are close to one side of a current collector in the positive pole piece, U3 represents the potential difference between the first potential detection component and the second potential detection component which are close to one side of the diaphragm in a negative pole piece, and U4 represents the potential difference between the first potential detection component and the second potential detection component which are close to one side of the current collector in the negative pole piece.
From the results shown in fig. 7, it can be seen that: the curves corresponding to U3 and U4 reach the peak value earlier, and the curves corresponding to U1 and U2 reach the peak value later, which means that the infiltration speed of the electrolyte in the negative electrode plate is greater than that of the electrolyte in the positive electrode plate; for U3 and U4, the curve corresponding to U3 peaks earlier and the curve corresponding to U4 peaks later, which means that the wetting speed of the electrolyte in the negative electrode plate near the separator is greater than the wetting speed of the electrolyte in the current collector; likewise, for U1 and U2, the curve corresponding to U1 peaks earlier and the curve corresponding to U2 peaks later, which means that in the positive electrode sheet, the wetting rate of the electrolyte near the separator is greater than the wetting rate of the electrolyte near the current collector.
Based on this, it can be determined that: the liquid absorption capacity of the negative electrode plate is larger than that of the positive electrode plate, the electrolyte infiltration speed is higher at the position close to the diaphragm, and the electrolyte amount is larger, so that the electrolyte infiltration amount is gradually reduced in the direction along the lamination direction of each coating and the direction from the diaphragm to the current collector.
Examples: taking the example of monitoring the degree of consumption.
2.1, manufacturing process of the battery cell:
the manufacturing process of the battery cell in this embodiment is similar to the manufacturing process in 1.1, and the specific manufacturing process can be seen in 1.1.
2.2, according to the principle:
the principle according to this embodiment is similar to that according to 1.2 above, and reference is specifically made to 1.2 above.
2.3, detection process:
the above-mentioned electric core is assembled into a battery, after the battery is formed into a constant volume, the battery is circulated at 60 ℃ under 1C/1C, a multichannel recorder is adopted to monitor potential difference in the circulation process, the monitoring result is shown in figure 8, and the specific meanings of U1, U2, U3 and U4 are the same as those of U1, U2, U3 and U4 mentioned in the foregoing 1.3, and the description is omitted here.
From the results shown in fig. 8, it can be seen that: as the number of cycles increases, the capacity retention rate (as the solid line thickened in the figure) tends to decrease; after 400 times of circulation, the potential difference of the corresponding curves of U3 and U4 rises relatively fast, and the potential difference of the corresponding curves of U1 and U2 rises relatively slowly, which means that the consumption speed of electrolyte in the negative pole piece is higher than that of electrolyte in the positive pole piece, which indicates that the negative pole piece is easier to be in a liquid shortage phenomenon, and the lithium ion intercalation and deintercalation capability can be influenced after the liquid shortage, the normal charge and discharge of the battery are adversely affected, and even the battery can not be charged quickly; after 400 cycles, the potential difference of the curves corresponding to U1 to U4 is in an ascending trend, which indicates that the organic solvent in the electrolyte is consumed, and the organic solvent becomes other substances through side reaction, so that the concentration of lithium ions in the electrolyte is increased, and when the consumption speed of the negative electrode plate is high, the phenomenon of lithium precipitation is easy to occur in the negative electrode plate, and the unsafe performance of the battery is improved.
Based on the same inventive concept, an embodiment of the present utility model further provides a battery, as shown in fig. 9, including: electrolyte (not shown in the figure) and the above-mentioned battery cell 100 provided in the embodiment of the present utility model, the battery cell 100 is immersed with the electrolyte.
Therefore, the amount of the electrolyte infiltrated in the positive electrode plate and/or the negative electrode plate and the consumption of the electrolyte can be evaluated, so that the distribution condition of the electrolyte in the battery can be dynamically monitored, the failure of the battery core is early warned, the use of the battery is prevented from being influenced, and the safety of the battery is improved.
In some embodiments, the battery may be a lithium ion battery.
In some embodiments, as shown in fig. 9, the battery may further include: the battery cell 100 and the electrolyte are arranged in the accommodating space 230; the cover plate 220 is provided with a liquid injection hole 221 and an explosion-proof valve 222, and at least one of the first potential detecting component 31 and the second potential detecting component 32 can be led out to the outside of the accommodating space 230 through the liquid injection hole 221 and/or the explosion-proof valve 222. In this way, the first potential detecting element 31 and the second potential detecting element 32 can be conveniently connected with a detecting device (not shown in the figure) outside the battery, so as to monitor the degree of infiltration and the degree of consumption of the electrolyte.
In some embodiments, the battery may include other structures for performing the functions of the battery in addition to the above-described structures, which are not limited herein.
In summary, the technical scheme provided by the embodiment of the utility model has the following advantages:
1. setting up multilayer coating and putting into first potential detection subassembly between the coating, setting up second potential detection subassembly between the diaphragm, when first potential detection subassembly and second potential detection subassembly are the reference electrode, design a multi-reference battery structure, the reference electrode that is arranged in the coating in this battery structure and the reference electrode that is arranged in between the diaphragm form concentration battery because of electrolyte infiltration exists the difference, can judge the infiltration degree of different degree of depth electrolyte in anodal pole piece and/or the negative pole piece through the potential difference that detects.
2. The distribution condition of electrolyte in the circulation process can be detected, so that the online dynamic monitoring is realized, references are provided for judging the failure of the battery core and predicting the service life of the battery, and the early warning is realized.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A pole piece, comprising: a current collector, a multilayer coating and a first potential detection component;
each of the coating stacks is disposed over the current collector, with portions of the first potential sensing component being sandwiched between adjacent ones of the coatings, the first potential sensing component being disposed in isolation from the current collector.
2. The pole piece of claim 1, wherein the first potential sensing component is a copper wire.
3. The pole piece of claim 2, wherein the copper wire surface is lithium plated.
4. The pole piece of claim 1, wherein the first potential sensing element is filiform and has a diameter no greater than 30 μm.
5. A pole piece according to any of claims 1-4, characterized in that the first potential detecting elements are provided in a plurality, at least partially between adjacent ones of the coating layers, the first potential detecting elements being provided, one of the first potential detecting elements being provided between adjacent ones of the coating layers.
6. The pole piece of claim 5, wherein the difference between the length of the portion of one of the first potential sensing elements located within the multilayer coating and the length of the portion of the other of the first potential sensing elements located within the multilayer coating is no greater than a threshold value.
7. A cell, comprising: the lithium ion battery comprises a positive pole piece, a negative pole piece and a diaphragm positioned between the positive pole piece and the negative pole piece;
a pole piece as claimed in any one of claims 1 to 6, at least one of the positive pole piece and the negative pole piece.
8. The cell of claim 7, wherein two diaphragms are laminated between the positive electrode piece and the negative electrode piece, and a second potential detection assembly is arranged between the two diaphragms.
9. The cell of claim 8, wherein the first potential sensing component and the second potential sensing component are identical in structure.
10. A battery, comprising: electrolyte and a cell according to any of claims 7-9, said cell being immersed in said electrolyte.
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| CN202320196180.XU CN219321379U (en) | 2023-02-08 | 2023-02-08 | Pole piece, battery core and battery |
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| CN202320196180.XU CN219321379U (en) | 2023-02-08 | 2023-02-08 | Pole piece, battery core and battery |
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