CN114613932B - Pole piece structure and battery - Google Patents
Pole piece structure and battery Download PDFInfo
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- CN114613932B CN114613932B CN202210302897.8A CN202210302897A CN114613932B CN 114613932 B CN114613932 B CN 114613932B CN 202210302897 A CN202210302897 A CN 202210302897A CN 114613932 B CN114613932 B CN 114613932B
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 70
- 239000011149 active material Substances 0.000 claims abstract description 33
- 238000012544 monitoring process Methods 0.000 claims abstract description 22
- 239000000126 substance Substances 0.000 claims abstract description 6
- 230000008447 perception Effects 0.000 claims abstract description 4
- 239000012229 microporous material Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 16
- 239000010410 layer Substances 0.000 description 197
- 238000000034 method Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000008018 melting Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
-
- 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
Abstract
The invention discloses a pole piece structure and a battery, and relates to the technical field of battery perception. The pole piece structure comprises a current collector and a sensing piece. The current collector comprises a first active material layer, a first metal conductive layer, a supporting layer, a second metal conductive layer and a second active material layer which are sequentially stacked. The sensing piece comprises a sensing layer and a sensing lead wire, the sensing layer is electrically connected with the sensing lead wire, the sensing layer and the sensing lead wire are arranged in the supporting layer, the sensing lead wire extends out of the supporting layer along the plane where the first metal conductive layer is located, and the sensing layer is used for monitoring the physical/chemical state of the location where the sensing lead wire is located and conveying sensing signals outwards through the sensing lead wire. The pole piece structure and the battery have the characteristics of being capable of directly monitoring the internal state of the battery and being high in monitoring speed and accuracy.
Description
Technical Field
The invention relates to the technical field of battery perception, in particular to a pole piece structure and a battery.
Background
The battery is widely applied to various large fields such as electric automobiles, electronic communication, aerospace and the like, the safety of the battery is more important than that of the electric automobiles, and once the thermal runaway of the single battery is diffused to the whole battery system, serious safety accidents such as fire explosion of the electric automobiles can occur.
The sensor in the existing battery monitoring mode is a certain distance away from the battery core, so that the internal state of the battery core is difficult to directly monitor, and the response speed and the monitoring precision are affected.
In view of this, it is important to develop a pole piece structure and a battery capable of solving the above technical problems.
Disclosure of Invention
The invention aims to provide a pole piece structure and a battery, which are characterized by being capable of directly monitoring the internal state of the battery and having higher monitoring speed and accuracy.
The invention provides a technical scheme that:
In a first aspect, an embodiment of the present invention provides a pole piece structure, including a current collector and a sensing member;
the current collector comprises a first active material layer, a first metal conductive layer, a supporting layer, a second metal conductive layer and a second active material layer which are sequentially stacked;
the sensing piece comprises a sensing layer and a sensing lead wire, the sensing layer is electrically connected with the sensing lead wire, the sensing layer and the sensing lead wire are arranged in the supporting layer, the sensing lead wire extends out of the supporting layer along the plane where the first metal conductive layer is located, and the sensing layer is used for monitoring the physical/chemical state of the position where the sensing layer is located and conveying sensing signals outwards through the sensing lead wire.
With reference to the first aspect, in another implementation manner of the first aspect, the sensing element further includes a first cover layer and a second cover layer;
the first cover layer, the sensing layer and the second cover layer are sequentially stacked and arranged, and are located between the first metal conductive layer and the second metal conductive layer.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, a height of the first cover layer, the sensing layer, and the second cover layer after lamination is less than or equal to a thickness of the supporting layer, and all the first cover layer, the sensing layer, and the second cover layer are disposed in the supporting layer.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, a projection of the first cover layer on the second metal conductive layer is greater than a projection of the sensing layer on the second metal conductive layer.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the first cover layer and the second cover layer each extend along the sensing lead to jointly cover the sensing lead.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the sensing element further includes a connection portion, and the connection portion is adhesive;
The sensing groove is formed in the supporting layer, the first covering layer, the sensing layer and the second covering layer are arranged in the sensing groove, gaps are formed between the peripheral edges of the first covering layer, the sensing layer and the second covering layer, and the side walls of the sensing groove, and the connecting portions fill the gaps to fix the first covering layer, the sensing layer and the second covering layer in the sensing groove.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the supporting layer is made of a microporous material and is capable of being shrunk and melted by heat.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the support layer is provided with a support protrusion, the support protrusion extends between the first active material layer and the second active material layer, and the sensing lead extends to the support protrusion and exposes a terminal end of the sensing lead.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the first metal conductive layer is provided with a first metal protrusion, and the second metal conductive layer is provided with a second metal protrusion;
The first metal protrusion and the second metal protrusion each extend between the first active material layer and the second active material layer, and the support protrusion is located between the first metal protrusion and the second metal protrusion;
the length of the first metal protrusion is smaller than that of the second metal protrusion to expose a portion of the supporting protrusion, thereby exposing the sensing lead terminal.
In a second aspect, an embodiment of the present invention further provides a battery, which includes the pole piece structure. The pole piece structure comprises a current collector and a sensing piece; the current collector comprises a first active material layer, a first metal conductive layer, a supporting layer, a second metal conductive layer and a second active material layer which are sequentially stacked; the sensing piece comprises a sensing layer and a sensing lead wire, the sensing layer is electrically connected with the sensing lead wire, the sensing layer and the sensing lead wire are arranged in the supporting layer, the sensing lead wire extends out of the supporting layer along the plane where the first metal conductive layer is located, and the sensing layer is used for monitoring the physical/chemical state of the position where the sensing layer is located and conveying sensing signals outwards through the sensing lead wire.
Compared with the prior art, the pole piece structure provided by the embodiment of the invention has the beneficial effects that compared with the prior art, the pole piece structure comprises:
The pole piece structure comprises a current collector and a sensing piece, wherein the current collector comprises a first active material layer, a first metal conductive layer, a supporting layer, a second metal conductive layer and a second active material layer which are sequentially stacked, the sensing piece comprises a sensing layer and a sensing lead, the sensing layer is electrically connected with the sensing lead, the sensing layer and the sensing lead are both arranged in the supporting layer, the sensing lead extends out of the supporting layer along the plane where the first metal conductive layer is located, physical/chemical states of the position where the sensing lead is located are monitored through the sensing layer arranged inside, such as temperature, deformation degree, pressure, hydrogen concentration, oxygen concentration, pH value and the like, sensing signals are outwards conveyed through the sensing lead by the sensing layer, so that an external module can monitor the state of the pole piece structure, the state of charge, the state of health and the like of a battery can be evaluated, and early warning is carried out in advance for thermal runaway of the battery. Because it is directly monitored through the perception layer that sets up at the supporting layer for it can the inside state of direct monitoring pole piece structure, and its monitoring speed and precision are higher.
The beneficial effects of the battery provided by the embodiment of the invention relative to the prior art are the same as those of the pole piece structure relative to the prior art, and are not repeated here.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. 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. Other relevant drawings may be made by those of ordinary skill in the art without undue burden from these drawings.
Fig. 1 is a schematic structural diagram of a pole piece structure according to an embodiment of the present invention when the pole piece structure is applied to a battery.
Fig. 2 is a schematic structural explosion diagram of a pole piece structure according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a partially cut-away structure of a pole piece structure according to an embodiment of the present invention.
Fig. 4 is an exploded schematic view of a part of the pole piece structure according to the embodiment of the present invention.
Icon: 100-cell; 20-wiring rows; 30-gold wire; 31-ball welding; 32-fish tail welding; 10-pole piece structure; 11-current collector; 111-a first active material layer; 112-a first metal conductive layer; 1121-a first metal protrusion; 113-a support layer; 1131-support protrusions; 1132-a sensor slot; 114-a second metal conductive layer; 1142-a second metal protrusion; 115-a second active material layer; 12-perception; 121-a first cover layer; 120-perception layer; 122-a second cover layer; 123-connecting part; 125-sense leads.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. The components of the 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.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. The terms "upper," "lower," "inner," "outer," "left," "right," and the like refer to an orientation or positional relationship based on that shown in the drawings, or that is conventionally put in place when the inventive product is used, or that is conventionally understood by those skilled in the art, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It should also be noted that unless explicitly stated or limited otherwise, terms such as "disposed," "connected," and the like should be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The following describes specific embodiments of the present invention in detail with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a pole piece structure 10 according to an embodiment of the invention when applied to a battery 100.
The embodiment of the invention provides a pole piece structure 10, and the pole piece structure 10 has the characteristics of being capable of directly monitoring the internal state of the pole piece structure, and being high in monitoring speed and accuracy. The pole piece structure 10 can be applied to various types of batteries 100 and the like.
When the pole piece structure 10 is applied to the battery 100, a plurality of pole pieces are stacked to form a battery cell of the battery 100, and a signal amplifying module, a wireless transmitting module and the like can be further arranged in the battery 100 to send out signals monitored by the pole piece structure 10 so as to evaluate the charge state of the battery 100, the health state of the battery 100 and the like, and early warning is carried out for thermal runaway of the battery 100. Because the battery 100 adopts the pole piece structure 10 provided by the embodiment of the invention, the battery 100 also has the characteristics of being capable of directly monitoring the internal state of the battery 100 and being high in monitoring speed and accuracy.
The following specifically describes the structural composition, the working principle and the beneficial effects of the pole piece structure 10 provided in the embodiment of the present invention.
Referring to fig. 2,3 and 4, fig. 2 is an exploded view of a pole piece structure 10 according to an embodiment of the present invention. Fig. 3 is a schematic view of a partially cut-away structure of a pole piece structure 10 according to an embodiment of the present invention. Fig. 4 is an exploded view of a portion of the pole piece structure 10 according to an embodiment of the present invention.
The pole piece structure 10 comprises a current collector 11 and a sensing piece 12, wherein the current collector 11 comprises a first active material layer 111, a first metal conductive layer 112, a supporting layer 113, a second metal conductive layer 114 and a second active material layer 115 which are sequentially stacked, the sensing piece 12 comprises a sensing layer 120 and a sensing lead 125, the sensing layer 120 is electrically connected with the sensing lead 125, the sensing layer 120 and the sensing lead 125 are both arranged in the supporting layer 113, the sensing lead 125 extends out of the supporting layer 113 along the plane of the first metal conductive layer 112 so as to monitor the physical/chemical state of the position of the battery 100, such as temperature, deformation degree, pressure, hydrogen concentration, oxygen concentration, pH value and the like, through the sensing layer 120, the sensing signal is conveyed outwards through the sensing lead 125, so that the state of the battery 100 is conveniently monitored by an external module, the state of charge, the state of health and the like of the battery 100 are evaluated, and early warning is carried out for thermal runaway of the battery 100. Because it is directly monitored through the sensing layer 120 arranged on the supporting layer 113, the internal state of the pole piece structure 10 can be directly monitored, and the monitoring speed and the monitoring precision are higher.
It should be noted that, in the present embodiment, the sensing layer 120 may be a strain gauge such as a sensitive grid, and the number of sensing layers 120 may also be multiple, and multiple sensing layers 120 may be arranged in the supporting layer 113 along a straight line, a curved line or a folding line, or may be arranged to form a regular pattern or a special pattern such as a square, a circle, a triangle, a polygon, etc., particularly, a position where the pole piece structure 10 is close to the housing of the battery 100, a quarter thickness of the battery 100, and a middle area of the pole piece structure 10, etc., so as to adapt to specific monitoring requirements.
Further, the sensing element 12 may further include a first cover layer 121 and a second cover layer 122, where the first cover layer 121, the sensing layer 120 and the second cover layer 122 are sequentially stacked and disposed between the first metal conductive layer 112 and the second metal conductive layer 114, in other words, the sensing layer 120 is disposed between the first cover layer 121 and the second cover layer 122, so as to separate the first metal conductive layer 112 and the sensing layer 120 through the first cover layer 121, separate the second metal conductive layer and the sensing layer 120 through the second cover layer 122, and play a role of protecting the sensing layer 120, thereby improving the usage stability of the sensing layer 120.
It should be noted that, in the present embodiment, the first cover layer 121 may be made of a microporous material, such as a polymer foam polymer, or polyimide, so that it has a certain rigidity and flexibility, can bear a relatively high pressure and a high temperature, and has an insulating capability, and after the first cover layer 121 is applied to the sensing layer 120, it forms a local network structure between the first metal conductive layer 112 and the sensing layer 120, so as to reduce the probability of forming a boundary effect due to stress of a single sensing layer 120, so that the structure of the sensing layer 120 is reinforced, and the reliability of sensing monitoring is further improved.
Further, the projection of the first cover layer 121 on the second metal conductive layer 114 is larger than the projection of the sensing layer 120 on the second metal conductive layer 114, in other words, the first cover layer 121 completely covers the sensing layer 120, and the edge of the sensing layer 120 corresponds to the bottom surface of the first cover layer 121, so that the probability of forming a boundary effect due to the stress of the sensing layer 120 is further reduced, and the effect of separating the first metal conductive layer 112 from the sensing layer 120 by the first cover layer 121 is improved. Of course, the second cover layer 122 may also be made of a microporous material, and the size relationship with the sensing layer 120 is similar to that of the first cover layer 121, which will not be described herein.
It should be noted that, the first cover layer 121 and the second cover layer 122 also extend along the sensing lead 125, so as to jointly cover the sensing lead 125, so that the overall structure of the sensing lead 125 is reinforced, and reliable signal transmission is ensured.
Further, in the present embodiment, the height of the first cover layer 121, the sensing layer 120 and the second cover layer 122 after being stacked is equal to the thickness of the supporting layer 113, and is disposed in the supporting layer 113, as shown in fig. 3, although in other embodiments, the height of the first cover layer 121, the sensing layer 120 and the second cover layer 122 after being stacked may be smaller than the thickness of the supporting layer 113, so as to embed the sensing layer 120 into the supporting layer 113, thereby protecting the peripheral edge of the sensing layer 120.
Further, in an embodiment, the sensing element 12 may further include a connecting portion 123, and the connecting portion 123 is adhesive. The supporting layer 113 may be provided with a sensing groove 1132, the first cover layer 121, the sensing layer 120 and the second cover layer 122 are disposed in the sensing groove 1132, so as to be embedded into the supporting layer 113, and gaps are formed between the peripheral edges of the first cover layer 121, the sensing layer 120 and the second cover layer 122 and the sidewalls of the sensing groove 1132, and the connecting portion 123 fills the gaps, so that the first cover layer 121, the sensing layer 120 and the second cover layer 122 are fixed in the sensing groove 1132, and the peripheral edges of the sensing layer 120 are further protected by the connecting portion 123.
In addition, in the present embodiment, the supporting layer 113 may be made of a microporous material and has a heat shrinkage and melting property, such as ethylene-octene block copolymer, so that the supporting layer 113 has a low elastic modulus and forms a layered annular sponge structure with the first metal conductive layer 112 and the second metal conductive layer 114 to improve the supporting protection effect on the sensing layer 120. In addition, when a contact short circuit occurs, the supporting layer 113 is heated, melted and contracted at the short circuit to form a partial structural collapse, so that a short circuit current loop is cut off before thermal runaway, and the safety of the whole battery 100 is further improved.
In addition, in other embodiments, the sensing layer 120 and the first cover layer 121 and the second cover layer 122 may be stacked in the first active material layer 111, or may form a pole piece with a sensing portion. And the manufacturing is that the first active material layer 111 can be cleaned by a laser cleaner to form a gully with a corresponding shape, the prefabricated sensing piece 12 is arranged in the gully and is connected with the periphery, and after solidification, the upper surface layer of the sensing piece 12 is coated with an active material layer, so that the surface is smooth and no obvious edge exists.
With continued reference to fig. 1 and 4, the supporting layer 113 is provided with a supporting protrusion 1131, and the supporting protrusion 1131 extends between the first active material layer 111 and the second active material layer 115, and the sensing lead 125 extends to the supporting protrusion 1131 and exposes the end of the sensing lead 125, so that the sensing lead 125 extending from the first active material layer 111 and the second active material layer 115 through the wrapping portion of the supporting protrusion 1131 further improves the stability of signal transmission.
It should be noted that, the first cover layer 121 and the second cover layer 122 may also extend between the first active material layer 111 and the second active material layer 115 along the supporting protrusion 1131 to wrap a portion of the sensing leads 125, so as to further improve stability of signal transmission.
The first metal conductive layer 112 may further be provided with a first metal protrusion 1121, the second metal conductive layer 114 is provided with a second metal protrusion 1142, the first metal protrusion 1121 and the second metal protrusion 1142 each protrude between the first active material layer 111 and the second active material layer 115, and a supporting protrusion 1131 is located between the first metal protrusion 1121 and the second metal protrusion 1142 to further protect the protruding sensing lead 125, and the length of the first metal protrusion 1121 is smaller than the length of the second metal protrusion 1142 to expose a portion of the supporting protrusion 1131 to expose an end of the sensing lead 125 so as to externally connect the sensing lead 125.
It should be noted that, after the plurality of pole piece structures 10 of the battery 100 are stacked, the supporting protrusions 1131 of each of the plurality of pole piece structures 10 are staggered, and the sensing lead wires are led out in a concentrated manner along the extending ends of the same side of the battery 100, as shown in fig. 1, so as to facilitate external connection of the sensing lead wires 125, and simplify the processing technology.
And, the terminal of the bank 20 and the sense leads 125 of the battery 100 are connected by Wire-Bonding through the sense leads 125, that is, the gold Wire 30 is used as a welding material, and one end of the gold Wire 30 is fused with the extended terminal of the sense leads 125 by thermosonic, thereby forming a first welding point, i.e., the ball bond 31; the other end of the gold wire 30 is then crimped to the wire harness 20 by ultrasonic welding to form a second weld, namely a fish tail weld 32. The connection occupies a small space of the battery 100.
In summary, the embodiment of the invention provides the pole piece structure 10, which has the characteristics of being capable of directly monitoring the internal state of the pole piece structure, and having higher monitoring speed and accuracy.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention, and the features of the above embodiments may be combined with each other, and various modifications and variations may be possible to those skilled in the art without collision. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Also, the embodiments should be regarded as exemplary and non-limiting.
Claims (4)
1. The pole piece structure is characterized by comprising a current collector (11) and a sensing piece (12);
The current collector (11) comprises a first active material layer (111), a first metal conductive layer (112), a supporting layer (113), a second metal conductive layer (114) and a second active material layer (115) which are sequentially stacked;
The sensing piece (12) comprises a sensing layer (120) and a sensing lead (125), the sensing layer (120) is electrically connected with the sensing lead (125), the sensing layer (120) and the sensing lead (125) are both arranged in the supporting layer (113), the sensing lead (125) extends out of the supporting layer (113) along the plane of the first metal conductive layer (112), and the sensing layer (120) is used for monitoring the physical or chemical state of the position and conveying sensing signals outwards through the sensing lead (125);
The sensing piece (12) further comprises a first covering layer (121) and a second covering layer (122);
The first cover layer (121), the sensing layer (120) and the second cover layer (122) are sequentially stacked and arranged, and are positioned between the first metal conductive layer (112) and the second metal conductive layer (114);
The sensing piece (12) further comprises a connecting part (123), and the connecting part (123) is adhesive;
The support layer (113) is provided with a sensing groove (1132), the first cover layer (121), the sensing layer (120) and the second cover layer (122) are arranged in the sensing groove (1132), gaps are formed between the peripheral edges of the first cover layer (121), the sensing layer (120) and the second cover layer (122) and the side wall of the sensing groove (1132), and the connecting part (123) fills the gaps so as to fix the first cover layer (121), the sensing layer (120) and the second cover layer (122) in the sensing groove (1132);
the height of the first covering layer (121), the sensing layer (120) and the second covering layer (122) after being laminated is smaller than or equal to the thickness of the supporting layer (113), and the first covering layer, the sensing layer and the second covering layer are all arranged in the supporting layer (113);
-the projection of the first cover layer (121) on the second metal conductive layer (114) is larger than the projection of the perception layer (120) on the second metal conductive layer (114);
-the first cover layer (121) and the second cover layer (122) each extend along the sense leads (125) to jointly cover the sense leads (125);
The support layer (113) is provided with a support protrusion (1131), the support protrusion (1131) extends between the first active material layer (111) and the second active material layer (115), the sensing lead (125) extends to the support protrusion (1131), and the tail end of the sensing lead (125) is exposed.
2. Pole piece structure according to claim 1, characterized in that the support layer (113) is made of microporous material and is heat shrinkable and meltable.
3. The pole piece structure according to claim 1, characterized in that the first metal conductive layer (112) is provided with a first metal protrusion (1121), the second metal conductive layer (114) is provided with a second metal protrusion (1142);
the first metal protrusion (1121) and the second metal protrusion (1142) each extend between the first active material layer (111) and the second active material layer (115), and the support protrusion (1131) is located between the first metal protrusion (1121) and the second metal protrusion (1142);
the length of the first metal protrusion (1121) is smaller than the length of the second metal protrusion (1142) to expose a portion of the support protrusion (1131) to expose the sensing lead (125) tip.
4. A battery comprising a pole piece structure as claimed in any one of claims 1 to 3.
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| CN114613932A (en) | 2022-06-10 |
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