CN117936926A - Lithium battery, terminal equipment, lithium precipitation detection method of lithium battery and charging method - Google Patents
Lithium battery, terminal equipment, lithium precipitation detection method of lithium battery and charging method Download PDFInfo
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- CN117936926A CN117936926A CN202211267987.4A CN202211267987A CN117936926A CN 117936926 A CN117936926 A CN 117936926A CN 202211267987 A CN202211267987 A CN 202211267987A CN 117936926 A CN117936926 A CN 117936926A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 188
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 167
- 238000001556 precipitation Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 103
- 230000006698 induction Effects 0.000 claims abstract description 85
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 43
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 43
- 238000004458 analytical method Methods 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims description 143
- 230000005611 electricity Effects 0.000 claims description 54
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 32
- 239000012790 adhesive layer Substances 0.000 claims description 21
- 239000011241 protective layer Substances 0.000 claims description 19
- 239000000758 substrate Substances 0.000 claims description 19
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- 238000000576 coating method Methods 0.000 claims description 12
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- 230000005389 magnetism Effects 0.000 abstract description 15
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- 239000002245 particle Substances 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 6
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- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 150000002739 metals Chemical class 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 230000008859 change Effects 0.000 description 11
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 10
- 239000000446 fuel Substances 0.000 description 8
- 230000006399 behavior Effects 0.000 description 6
- 230000005307 ferromagnetism Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- -1 Polypropylene Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The disclosure relates to a lithium battery, a terminal device, a lithium analysis detection method of the lithium battery and a charging method. The lithium battery includes: the battery cell comprises an anode winding layer, a cathode winding layer and a diaphragm connected between the anode winding layer and the cathode winding layer, wherein one side of the diaphragm, which is close to the cathode winding layer, is coated with a metal oxide layer. And the protection plate is connected with the battery cell and is provided with a magnetic induction coil. Thus, when lithium is precipitated by charging the battery, lithium metal precipitated on the surface of the negative electrode is brought into direct contact with metal oxide particles on the separator. Lithium metal can reduce metal oxides to elemental metals that are magnetic. After lithium precipitation, the precipitated metal simple substance presents magnetism, and mutation of a magnetic field occurs. The abrupt magnetic field can generate current at the magnetic induction coil, so that the occurrence of lithium precipitation can be judged, the lithium precipitation phenomenon of nondestructive in-situ detection is realized, and the safety of the battery is improved.
Description
Technical Field
The disclosure relates to the technical field of batteries, in particular to a lithium battery, a terminal device, a lithium separation detection method of the lithium battery and a charging method.
Background
Lithium ion batteries are currently the most widely used energy storage systems, thanks to their high energy density and stability. However, the phenomenon of lithium precipitation in lithium ion batteries greatly limits their development. When the battery is charged quickly, significant polarization of the negative electrode occurs. When the potential of the negative electrode is lower than 0V, lithium precipitation occurs on the surface of graphite, and the lithium precipitation behavior causes a sharp drop in the cycle capacity of the battery.
At present, two ways are generally adopted to detect lithium precipitation, one way is to directly observe the lithium precipitation phenomenon of a negative electrode after the battery is disassembled, complex and tedious operations of the disassembly, sample preparation, transfer and other processes are avoided, and the battery cannot be recycled due to disassembly failure. The other is to monitor the voltage change in the process of inserting graphite into lithium, but the detection of the lithium precipitation behavior is lagged and cannot reflect the potential safety hazard in time.
Disclosure of Invention
The disclosure provides a lithium battery, a terminal device, a lithium separation detection method of the lithium battery and a charging method, so as to solve part or all of the above technical problems.
In order to achieve the above purpose, the technical scheme adopted in the present disclosure is as follows:
in a first aspect, embodiments of the present disclosure provide a lithium battery, comprising:
The battery cell comprises an anode winding layer, a cathode winding layer and a diaphragm connected between the anode winding layer and the cathode winding layer, wherein one side of the diaphragm, which is close to the cathode winding layer, is coated with a metal oxide layer;
and the protection plate is connected with the battery cell and is provided with a magnetic induction coil.
Optionally, the separator comprises a substrate, a first adhesive layer and a second adhesive layer, wherein the first adhesive layer is connected to one side of the substrate close to the positive electrode winding layer, and the second adhesive layer is connected to one side of the substrate close to the negative electrode winding layer; the metal oxide layer is coated between the substrate and the second adhesive layer.
Optionally, the separator further comprises a first protective layer and a second protective layer, wherein the first protective layer is connected between the substrate and the first adhesive layer, and the second protective layer is connected between the substrate and the second adhesive layer; the metal oxide layer is coated between the second protective layer and the second adhesive layer.
Optionally, the metal oxide layer comprises an iron oxide layer.
Optionally, the battery cell further comprises a positive electrode tab and a negative electrode tab, wherein the positive electrode tab is connected with the positive electrode winding layer and protrudes out of the battery cell along a first direction; the negative electrode tab is connected with the negative electrode winding layer and protrudes out of the battery cell along the first direction, and the negative electrode tab and the positive electrode tab are positioned on the same side of the battery cell; the first direction is perpendicular to the winding direction of the positive electrode winding layer and the negative electrode winding layer;
The protection board is connected with the positive electrode tab and the negative electrode tab, the magnetic induction coil is welded to one side of the protection board along the first direction, and the magnetic induction coil covers the projection surface of the protection board along the first direction.
Optionally, the metal oxide layer includes a plurality of elongated coating layers, and the plurality of elongated coating layers are arranged at intervals along a first direction, and the first direction is perpendicular to the winding direction of the positive electrode winding layer and the negative electrode winding layer; or (b)
The metal oxide layer comprises a plurality of strip-shaped coatings, the strip-shaped coatings are arranged at intervals along a second direction, and the second direction is in the same direction as the winding direction of the positive electrode winding layer and the negative electrode winding layer; or (b)
The separator includes a plurality of winding layers, and the metal oxide layer is coated on the winding layers with a set number of layers.
In a second aspect, an embodiment of the present disclosure provides a terminal device, including a lithium battery as described in the first aspect.
In a third aspect, an embodiment of the present disclosure provides a lithium analysis detection method of a lithium battery, where the lithium battery is a lithium battery as described in the first aspect, and the detection method includes:
detecting a current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil;
and if the electricity meter detects the target current signal of the magnetic induction coil, judging the lithium precipitation condition of the lithium battery according to the target current signal.
In a fourth aspect, an embodiment of the present disclosure provides a charging method of a lithium battery, where the lithium battery is a lithium battery according to the first aspect, the charging method includes:
detecting a current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil;
if the electricity meter detects the target current signal of the magnetic induction coil, reducing the charging current of the lithium battery or suspending the current charging process;
and when the current value of the target current signal is reduced to zero, the charging current of the lithium battery is increased or the current charging process is restored.
In a fifth aspect, embodiments of the present disclosure provide a lithium analysis detection method of a lithium battery, where the lithium battery includes a battery cell and a protection plate connected to the battery cell, and the battery cell includes a positive electrode winding layer, a negative electrode winding layer, and a separator connected between the positive electrode winding layer and the negative electrode winding layer; the detection method comprises the following steps:
Coating a metal oxide layer on one side of the diaphragm, which is close to the negative electrode winding layer;
a magnetic induction coil is arranged on the protection plate;
detecting a current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil;
and if the electricity meter detects the target current signal of the magnetic induction coil, judging the lithium precipitation condition of the lithium battery according to the target current signal.
In a fifth aspect, embodiments of the present disclosure provide a method of charging a lithium battery including a battery cell including a positive electrode winding layer, a negative electrode winding layer, and a separator connected between the positive electrode winding layer and the negative electrode winding layer, and a protection plate connected to the battery cell; the charging method comprises the following steps:
Coating a metal oxide layer on one side of the diaphragm, which is close to the negative electrode winding layer;
a magnetic induction coil is arranged on the protection plate;
detecting a current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil;
if the electricity meter detects the target current signal of the magnetic induction coil, reducing the charging current of the lithium battery or suspending the current charging process;
and when the current value of the target current signal is reduced to zero, the charging current of the lithium battery is increased or the current charging process is restored.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:
According to the lithium battery disclosed by the disclosure, the metal oxide is coated on one side of the diaphragm, which is close to the negative electrode winding layer, and the magnetic induction coil is arranged on the protection plate, so that lithium metal precipitated on the surface of the negative electrode can be in direct contact with metal oxide particles on the diaphragm when lithium precipitation occurs during battery charging. Lithium metal can reduce metal oxides to elemental metals that are magnetic. After lithium precipitation, the precipitated metal simple substance presents magnetism, and mutation of a magnetic field occurs. The abrupt magnetic field can generate current at the magnetic induction coil, so that the occurrence of lithium precipitation can be judged, the lithium precipitation phenomenon of nondestructive in-situ detection is realized, and the safety of the battery is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
Fig. 1 is a schematic view of a structure of a lithium battery according to an exemplary embodiment of the present disclosure.
Fig. 2 is a schematic structural view of a battery cell of a lithium battery according to an exemplary embodiment of the present disclosure.
Fig. 3 is a schematic structural view of a protective plate of a lithium battery according to an exemplary embodiment of the present disclosure.
Fig. 4 is a block diagram illustrating a structure of a battery cell of a lithium battery according to an exemplary embodiment of the present disclosure.
Fig. 5 is a schematic structural view of a separator of a lithium battery according to an exemplary embodiment of the present disclosure.
Fig. 6 is a schematic structural view of a separator of a lithium battery according to another exemplary embodiment of the present disclosure.
Detailed Description
The present disclosure will be described in detail below with reference to the detailed description of the embodiments shown in the drawings. These embodiments are not intended to limit the disclosure, but structural, methodological, or functional transformations of one of ordinary skill in the art based on these embodiments are included within the scope of the present disclosure.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
The lithium battery, the terminal device, the lithium analysis detection method of the lithium battery and the charging method of the lithium battery are described in detail below with reference to the accompanying drawings, and the following embodiments and features in the embodiments may be combined with each other without conflict.
The embodiment of the disclosure provides a terminal device, which can be a consumer electronic product or an electric automobile, and the consumer electronic product can be a mobile phone, a tablet computer, a notebook computer, a wearable device, a smart bracelet, a smart watch, a smart glasses, and the like. The terminal device includes a lithium battery, which may be a pouch battery.
Referring to fig. 1 to 4, fig. 2 is to be understood as a schematic view of the battery cell of fig. 1 from the bottom direction, and fig. 3 is to be understood as a schematic view of the protection plate of fig. 1 from the top direction. The lithium battery includes a battery cell 10 and a protection plate 20. The battery cell 10 comprises a positive electrode winding layer 11, a negative electrode winding layer 12 and a diaphragm 13 connected between the positive electrode winding layer 11 and the negative electrode winding layer 12, wherein one side of the diaphragm 13 close to the negative electrode winding layer 12 is coated with a metal oxide layer 14. A protection plate 20 is connected to the battery cell 10, and the protection plate 20 is provided with a magnetic induction coil 21. Alternatively, the metal oxide layer 14 may be galvanically coated on the diaphragm 13. The magnetic induction coil 21 may be welded to the protection plate 20. In the present embodiment, the positive electrode winding layer 11 is located outside the negative electrode winding layer 12. In other embodiments, the positive electrode winding layer 11 may be positioned inside the negative electrode winding layer 12. Optionally, the battery cell 10 may further include an electrolyte filled inside the battery cell. The positive electrode winding layer 11, the negative electrode winding layer 12, and the separator 13 may be porous structures so as to adsorb an electrolyte.
In the lithium battery of the present disclosure, the magnetic induction coil 21 is provided on the protection plate 20 by coating the metal oxide on the side of the separator 13 close to the negative electrode winding layer 12, so that when lithium precipitation occurs in battery charging, lithium metal precipitated on the surface of the negative electrode directly contacts with metal oxide particles on the separator 13. Lithium metal can reduce metal oxides to elemental metals that are magnetic. After lithium precipitation, the precipitated metal simple substance presents magnetism, and mutation of a magnetic field occurs. The abrupt magnetic field can generate current at the magnetic induction coil 21, so that the occurrence of lithium precipitation can be judged, the lithium precipitation phenomenon of nondestructive in-situ detection is realized, and the safety of the battery is improved.
In some alternative embodiments, the metal oxide layer 14 may include a plurality of elongated coating layers spaced apart along a first direction X (as shown in fig. 1) perpendicular to the winding direction of the positive electrode winding layer 11 and the negative electrode winding layer 12, similar to the zebra-line coating. Or a plurality of elongated coating layers are provided at intervals along a second direction which is the same direction as the winding direction of the positive electrode winding layer 11 and the negative electrode winding layer 12. Or the separator 13 includes a plurality of wound layers, and the metal oxide layer 14 is coated on the wound layers of a set number of layers. For example, the separator 13 includes four wound layers, and the metal oxide layer 14 is coated on two wound layers, which may be two wound layers from the inside to the outside, or two wound layers from the outside to the inside. It should be noted that, the metal oxide layer 14 may be locally coated on a specific area according to actual needs, which is not limited in the present disclosure.
In some alternative embodiments, the metal oxide layer 14 comprises an iron oxide layer. When lithium precipitation occurs during battery charging, lithium metal precipitated on the surface of the negative electrode is brought into direct contact with iron oxide particles on the separator 13. Lithium metal can reduce iron oxide to elemental iron. The generated iron simple substance has stronger magnetism. The lithium precipitation phenomenon can be detected in situ without damage by receiving abrupt magnetic signals through the magnetic induction coil 21 arranged on the protection plate 20. Of course, other magnetic metal materials may be used for the metal oxide layer 14, which is not limited by the present disclosure. Alternatively, the iron oxide layer is composed of iron oxide particles on the order of about 90% by mass and 10% PVDF (Polyvinylidene Difluoride, polyvinylidene fluoride) binder, with a thickness of about 2 μm. The micron-sized iron oxide particles can maintain ion transport channels on the membrane and also can maintain the cell at a low level of impedance.
Referring to fig. 5, in some alternative embodiments, the separator 13 includes a substrate 131, a first adhesive layer 132, and a second adhesive layer 133, wherein the first adhesive layer 132 is connected to a side of the substrate 131 adjacent to the positive electrode winding layer 11, and the second adhesive layer 133 is connected to a side of the substrate 131 adjacent to the negative electrode winding layer 12. The metal oxide layer 14 is coated between the substrate 131 and the second adhesive layer 133, i.e., on the side near the negative electrode winding layer 12. Alternatively, the substrate 131 may be PP (Polypropylene), PE (Polyethylene) material or other materials. The first adhesive layer 132 and the second adhesive layer 133 may be PVDF adhesive, or other adhesive materials.
Taking the metal oxide layer 14 as an iron oxide layer as an example, it can be understood that when lithium precipitation occurs during battery charging, lithium metal precipitated on the surface of the negative electrode pierces the second adhesive layer 133 and directly contacts with the iron oxide particles. Lithium metal can reduce iron oxide to elemental iron with relatively strong magnetism.
Referring to fig. 6, the separator 13 may further include a first protective layer 134 and a second protective layer 135, the first protective layer 134 being connected between the substrate 131 and the first adhesive layer 132, and the second protective layer 135 being connected between the substrate 131 and the second adhesive layer 133. The metal oxide layer 14 is coated between the second protective layer 135 and the second adhesive layer 133, i.e., on the side near the negative electrode winding layer 12. The first protective layer 134 and the second protective layer 135 may improve the structural strength of the diaphragm 13. Alternatively, the first protective layer 134 and the second protective layer 135 may be made of ceramic materials, or other materials with strong structural strength.
As shown in fig. 1 and 2, in some alternative embodiments, the battery cell 10 further includes a positive electrode tab 111 and a negative electrode tab 121, where the positive electrode tab 111 is connected to the positive electrode winding layer 11 and protrudes from the battery cell 10 along the first direction X. The negative electrode tab 121 is connected to the negative electrode winding layer 12 and protrudes from the battery cell 10 along the first direction X, and the negative electrode tab 121 and the positive electrode tab 111 are located on the same side (top side in fig. 1) of the battery cell 10. Fig. 2 is a schematic view of the battery cell of fig. 1 from the bottom, and the first direction X is perpendicular to the winding direction of the positive electrode winding layer 11 and the negative electrode winding layer 12.
The protection plate 20 may be connected to the positive electrode tab 111 and the negative electrode tab 121 by welding, the magnetic induction coil 21 may be welded to one side of the protection plate 20 along the first direction X, and the magnetic induction coil 21 may be welded to one side of the protection plate 20 along the first direction X, which is close to the battery cell 10, or one side of the protection plate 20, which is far from the battery cell 10, by welding. The magnetic induction coil 21 covers the projection surface of the metal oxide layer 14 on the protection board 20 along the first direction X along the projection surface of the protection board 20 along the first direction X, so as to ensure the accuracy of the magnetic induction signal.
In practical application, can connect the fuel gauge at the both ends of magnetic induction coil, can detect the electric current that magnetic induction coil passed through in real time through the fuel gauge. And judging the lithium precipitation condition of the lithium battery according to the current signal detected by the fuel gauge. Before lithium precipitation occurs, the whole battery core presents no magnetism or extremely weak magnetism, and the current signal cannot be detected by the fuel gauge. When lithium is separated out during battery charging, lithium metal separated out from the surface of the negative electrode can be in direct contact with ferric oxide on the diaphragm. The lithium metal can reduce ferric oxide into iron metal simple substance, presents strong ferromagnetism, changes the magnetic change of the battery core and generates mutation of a magnetic field. The abrupt magnetic field may generate a current at the magnetic induction coil. Therefore, when the current of the magnetic induction coil passes through, the electricity meter can capture the real-time current change and the current mutation, and the occurrence of lithium precipitation can be judged. Through the above structural design, the lithium battery disclosed by the disclosure can carry out high-precision real-time detection on lithium precipitation under the condition of no damage without introducing an additional sensor.
The embodiment of the disclosure also provides a lithium analysis detection method of a lithium battery, where the lithium battery may be a lithium battery described in the foregoing embodiments and implementations, and the detection method includes the following steps:
Step S1: and detecting the current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil.
Step S2: and if the electricity meter detects the target current signal of the magnetic induction coil, judging the lithium precipitation condition of the lithium battery according to the target current signal.
It will be appreciated that the electricity meter may detect the current passed by the induction coil in real time. And if the electricity meter detects a target current signal of the magnetic induction coil, judging the lithium precipitation condition of the lithium battery according to the target current signal. Before lithium precipitation occurs, the whole battery core presents no magnetism or extremely weak magnetism, and the current signal cannot be detected by the fuel gauge. When lithium is separated out during battery charging, lithium metal separated out from the surface of the negative electrode can be in direct contact with ferric oxide on the diaphragm. The lithium metal can reduce ferric oxide into iron metal simple substance, presents strong ferromagnetism, changes the magnetic change of the battery core and generates mutation of a magnetic field. The abrupt magnetic field may generate a current at the magnetic induction coil. Therefore, when the current of the magnetic induction coil passes through, the electricity meter can capture the real-time current change and the current mutation, and the occurrence of lithium precipitation can be judged.
The embodiment of the present disclosure further provides a charging method for a lithium battery, where the lithium battery may be a lithium battery described in the foregoing embodiments and implementations, and the charging method may include the following steps:
s11: and detecting the current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil.
S12: if the electricity meter detects the target current signal of the magnetic induction coil, reducing the charging current of the lithium battery or suspending the current charging process;
and when the current value of the target current signal is reduced to zero, the charging current of the lithium battery is increased or the current charging process is restored.
It will be appreciated that the electricity meter may detect the current passed by the induction coil in real time. And if the electricity meter detects the target current signal of the magnetic induction coil, judging the lithium precipitation condition of the lithium battery according to the target current signal. Before lithium precipitation occurs, the whole battery core presents no magnetism or extremely weak magnetism, and the current signal cannot be detected by the fuel gauge. When lithium is separated out during battery charging, lithium metal separated out from the surface of the negative electrode can be in direct contact with ferric oxide on the diaphragm. The lithium metal can reduce ferric oxide into iron metal simple substance, presents strong ferromagnetism, changes the magnetic change of the battery core and generates mutation of a magnetic field. The abrupt magnetic field may generate a current at the magnetic induction coil. Therefore, when the current of the magnetic induction coil passes through, the electricity meter can capture the real-time current change and the current mutation, and the occurrence of lithium precipitation can be judged.
If the electricity meter detects the target current signal of the magnetic induction coil, and the lithium analysis signal is fed back to the whole machine by the electricity meter to implement the reaction action when the lithium analysis occurs to the lithium battery, the whole machine can be understood as a terminal device applying the lithium battery. The controller of the terminal equipment can reduce the charging current of the lithium battery or pause the current charging process, can relieve the integral polarization of the battery core, and can stop the lithium precipitation behavior of the battery core, thereby ensuring the safe use of the battery. When the electricity meter detects that the current value of the target current signal is reduced to zero, the lithium precipitation behavior is stopped, and the charging current of the lithium battery can be improved or the current charging process can be restored through the controller of the terminal equipment. And when the lithium precipitation phenomenon occurs again after the charging is recovered, repeating the coping operation.
The embodiment of the disclosure also provides a lithium separation detection method of the lithium battery, and the lithium battery can also adopt a conventional battery. That is, the lithium battery includes a battery cell including a positive electrode winding layer, a negative electrode winding layer, and a separator connected between the positive electrode winding layer and the negative electrode winding layer, and a protection plate connected to the battery cell. The detection method may include the steps of:
Step S111: and coating a metal oxide layer on one side of the separator of the lithium battery, which is close to the negative electrode winding layer.
Step S112: and a magnetic induction coil is arranged on the protective plate of the lithium battery. The description of the diaphragm 13, the metal oxide layer 14, and the magnetic induction coil 21 in the above embodiments and examples is equally applicable to the detection method of the present embodiment.
Step S113: and detecting the current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil.
Step S114: and if the electricity meter detects the target current signal of the magnetic induction coil, judging the lithium precipitation condition of the lithium battery according to the target current signal.
It will be appreciated that the electricity meter may detect the current passed by the induction coil in real time. And if the electricity meter detects a target current signal of the magnetic induction coil, judging the lithium precipitation condition of the lithium battery according to the target current signal. Before lithium precipitation occurs, the whole battery core presents no magnetism or extremely weak magnetism, and the current signal cannot be detected by the fuel gauge. When lithium is separated out during battery charging, lithium metal separated out from the surface of the negative electrode can be in direct contact with ferric oxide on the diaphragm. The lithium metal can reduce ferric oxide into iron metal simple substance, presents strong ferromagnetism, changes the magnetic change of the battery core and generates mutation of a magnetic field. The abrupt magnetic field may generate a current at the magnetic induction coil. Therefore, when the current of the magnetic induction coil passes through, the electricity meter can capture the real-time current change and the current mutation, and the occurrence of lithium precipitation can be judged.
The embodiment of the disclosure also provides a charging method of the lithium battery, and the lithium battery can also adopt a conventional battery. That is, the lithium battery includes a battery cell including a positive electrode winding layer, a negative electrode winding layer, and a separator connected between the positive electrode winding layer and the negative electrode winding layer, and a protection plate connected to the battery cell. The charging method may include the steps of:
S1111: and coating a metal oxide layer on one side of the separator of the lithium battery, which is close to the negative electrode winding layer.
S1112: and a magnetic induction coil is arranged on the protective plate of the lithium battery. The description of the separator 13, the metal oxide layer 14, and the magnetic induction coil 21 in the above embodiments and examples is equally applicable to the charging method of the present embodiment.
S1113: the current signal of the magnetic induction coil is detected by an electricity meter connected to both ends of the magnetic induction coil 21.
S1114: if the electricity meter detects the target current signal of the magnetic induction coil, reducing the charging current of the lithium battery or suspending the current charging process;
and when the current value of the target current signal is reduced to zero, the charging current of the lithium battery is increased or the current charging process is restored.
It will be appreciated that the electricity meter may detect the current passed by the induction coil in real time. And if the electricity meter detects the target current signal of the magnetic induction coil, judging the lithium precipitation condition of the lithium battery according to the target current signal. Before lithium precipitation occurs, the whole battery core presents no magnetism or extremely weak magnetism, and the current signal cannot be detected by the fuel gauge. When lithium is separated out during battery charging, lithium metal separated out from the surface of the negative electrode can be in direct contact with ferric oxide on the diaphragm. The lithium metal can reduce ferric oxide into iron metal simple substance, presents strong ferromagnetism, changes the magnetic change of the battery core and generates mutation of a magnetic field. The abrupt magnetic field may generate a current at the magnetic induction coil. Therefore, when the current of the magnetic induction coil passes through, the electricity meter can capture the real-time current change and the current mutation, and the occurrence of lithium precipitation can be judged.
If the electricity meter detects the target current signal of the magnetic induction coil, and the lithium analysis signal is fed back to the whole machine by the electricity meter to implement the reaction action when the lithium analysis occurs to the lithium battery, the whole machine can be understood as a terminal device applying the lithium battery. The controller of the terminal equipment can reduce the charging current of the lithium battery or pause the current charging process, can relieve the integral polarization of the battery core, and can stop the lithium precipitation behavior of the battery core, thereby ensuring the safe use of the battery. When the electricity meter detects that the current value of the target current signal is reduced to zero, the lithium precipitation behavior is stopped, and the charging current of the lithium battery can be improved or the current charging process can be restored through the controller of the terminal equipment. And when the lithium precipitation phenomenon occurs again after the charging is recovered, repeating the coping operation.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (11)
1. A lithium battery, comprising:
The battery cell comprises an anode winding layer, a cathode winding layer and a diaphragm connected between the anode winding layer and the cathode winding layer, wherein one side of the diaphragm, which is close to the cathode winding layer, is coated with a metal oxide layer;
and the protection plate is connected with the battery cell and is provided with a magnetic induction coil.
2. The lithium battery of claim 1, wherein the separator comprises a substrate, a first glue layer and a second glue layer, the first glue layer is connected to a side of the substrate adjacent to the positive electrode winding layer, and the second glue layer is connected to a side of the substrate adjacent to the negative electrode winding layer; the metal oxide layer is coated between the substrate and the second adhesive layer.
3. The lithium battery of claim 2, wherein the separator further comprises a first protective layer and a second protective layer, the first protective layer being coupled between the substrate and the first glue layer, the second protective layer being coupled between the substrate and the second glue layer; the metal oxide layer is coated between the second protective layer and the second adhesive layer.
4. The lithium battery of claim 1, wherein the metal oxide layer comprises an iron oxide layer.
5. The lithium battery of claim 1, wherein the cell further comprises a positive tab and a negative tab, the positive tab being connected to the positive winding layer and protruding from the cell in a first direction; the negative electrode tab is connected with the negative electrode winding layer and protrudes out of the battery cell along the first direction, and the negative electrode tab and the positive electrode tab are positioned on the same side of the battery cell; the first direction is perpendicular to the winding direction of the positive electrode winding layer and the negative electrode winding layer;
The protection board is connected with the positive electrode tab and the negative electrode tab, the magnetic induction coil is welded to one side of the protection board along the first direction, and the magnetic induction coil covers the projection surface of the protection board along the first direction.
6. The lithium battery of claim 1, wherein the metal oxide layer comprises a plurality of elongated coating layers, the plurality of elongated coating layers being spaced apart along a first direction, the first direction being perpendicular to a winding direction of the positive electrode winding layer and the negative electrode winding layer; or (b)
The metal oxide layer comprises a plurality of strip-shaped coatings, the strip-shaped coatings are arranged at intervals along a second direction, and the second direction is in the same direction as the winding direction of the positive electrode winding layer and the negative electrode winding layer; or (b)
The separator includes a plurality of winding layers, and the metal oxide layer is coated on the winding layers with a set number of layers.
7. A terminal device comprising a lithium battery as claimed in any one of claims 1 to 6.
8. A lithium analysis detection method of a lithium battery, wherein the lithium battery is the lithium battery according to any one of claims 1 to 6, the detection method comprising:
detecting a current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil;
and if the electricity meter detects the target current signal of the magnetic induction coil, judging the lithium precipitation condition of the lithium battery according to the target current signal.
9. A charging method of a lithium battery, characterized in that the lithium battery is the lithium battery according to any one of claims 1 to 6, the charging method comprising:
detecting a current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil;
if the electricity meter detects the target current signal of the magnetic induction coil, reducing the charging current of the lithium battery or suspending the current charging process;
and when the current value of the target current signal is reduced to zero, the charging current of the lithium battery is increased or the current charging process is restored.
10. The lithium battery comprises a battery core and a protective plate connected with the battery core, wherein the battery core comprises a positive electrode winding layer, a negative electrode winding layer and a diaphragm connected between the positive electrode winding layer and the negative electrode winding layer; the detection method is characterized by comprising the following steps:
Coating a metal oxide layer on one side of the diaphragm, which is close to the negative electrode winding layer;
a magnetic induction coil is arranged on the protection plate;
detecting a current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil;
and if the electricity meter detects the target current signal of the magnetic induction coil, judging the lithium precipitation condition of the lithium battery according to the target current signal.
11. The lithium battery comprises a battery core and a protective plate connected with the battery core, wherein the battery core comprises a positive electrode winding layer, a negative electrode winding layer and a diaphragm connected between the positive electrode winding layer and the negative electrode winding layer; the charging method is characterized by comprising the following steps:
Coating a metal oxide layer on one side of the diaphragm, which is close to the negative electrode winding layer;
a magnetic induction coil is arranged on the protection plate;
detecting a current signal of the magnetic induction coil by using an electricity meter, wherein the electricity meter is connected with two ends of the magnetic induction coil;
if the electricity meter detects the target current signal of the magnetic induction coil, reducing the charging current of the lithium battery or suspending the current charging process;
and when the current value of the target current signal is reduced to zero, the charging current of the lithium battery is increased or the current charging process is restored.
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| CN202211267987.4A CN117936926A (en) | 2022-10-17 | 2022-10-17 | Lithium battery, terminal equipment, lithium precipitation detection method of lithium battery and charging method |
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| CN202211267987.4A CN117936926A (en) | 2022-10-17 | 2022-10-17 | Lithium battery, terminal equipment, lithium precipitation detection method of lithium battery and charging method |
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