CN214589165U - Battery cell and battery - Google Patents
Battery cell and battery Download PDFInfo
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- CN214589165U CN214589165U CN202120932043.9U CN202120932043U CN214589165U CN 214589165 U CN214589165 U CN 214589165U CN 202120932043 U CN202120932043 U CN 202120932043U CN 214589165 U CN214589165 U CN 214589165U
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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
Abstract
The utility model provides an electricity core and battery. The battery cell comprises a first pole piece, a second pole piece and a diaphragm, wherein the first pole piece, the second pole piece and the diaphragm are stacked and wound together, the first pole piece comprises a first current collector, a first active substance layer and a first pole lug, the first active substance layer and a groove are arranged on the first surface of the first current collector, the groove is an area on the first active substance layer, which exposes out of the first current collector, and the first pole lug is welded in the groove; the second pole piece includes the second mass flow body and second active substance layer, the second active substance layer sets up on the second mass flow body, the edge of the second mass flow body outwards extends and forms two at least foil electrode lugs. The utility model provides an electricity core and battery for in solving current battery at least, the not good technical problem of current density distribution homogeneity.
Description
Technical Field
The utility model relates to a battery technology field especially relates to an electricity core and battery.
Background
The lithium ion battery has the advantages of high specific energy, more recycling times, long storage time and the like, is gradually the current mainstream energy, has higher and higher performance requirements on the lithium ion battery, and has increasingly stronger competitive pressure of battery production enterprises. The quick charge is one of the main development directions of the lithium ion battery at present, and the development of the lithium ion battery capable of realizing the charge and discharge with high multiplying power is a great advantage for occupying the market share.
Lithium ion battery's pole piece design technology and electric core structural design have certain influence to the multiplying power performance, in order to promote battery big multiplying power charge-discharge performance, wash or reserve out blank recess in the middle of the battery pole piece usually, with utmost point ear welding in the recess, though can reduce the battery internal resistance by a wide margin like this, promote battery multiplying power performance, but have the defect: for example, in the battery, due to the impedance effect of the current collector and the active material layer on the pole piece, the current density around the tab is much higher than that of other positions, and the electrode potential around the tab is higher, which easily causes lithium precipitation at the position of the negative electrode tab, affects the cycle performance of the battery, and brings about serious potential safety hazard.
Therefore, there is a need to improve the conventional cell and battery structure to make the current density distribution at different positions of the electrode plate in the battery more uniform and improve the cycle performance of the battery.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electricity core and battery for in solving current battery at least, the not good technical problem of current density distribution homogeneity.
In order to achieve the above object, the present invention provides an electrical core and a battery. The utility model provides a battery cell, including first pole piece, second pole piece and diaphragm, first pole piece, second pole piece and diaphragm stack up and coil the setting jointly, first pole piece includes first mass flow body, first active substance layer and first utmost point ear, be provided with first active substance layer and recess on the first face of first mass flow body, the recess is the region that exposes on the first active substance layer the first mass flow body, weld the first utmost point ear in the recess; the second pole piece includes the second mass flow body and second active substance layer, the second active substance layer sets up on the second mass flow body, the edge of the second mass flow body outwards extends and forms two at least foil electrode lugs.
The utility model provides a pair of electric core is favorable to reducing the internal resistance, can effectively reduce current loss in the battery makes be close to in the second pole piece position around the foil utmost point ear with keep away from current density difference between other positions of foil utmost point ear reduces, reduces electrode potential around the foil utmost point ear makes current density distributes more evenly on the different positions of battery to improve the big multiplying power charge-discharge performance of battery.
In one possible embodiment, the side projection of the first tab is located between the side projections of the two foil tabs on the side projection of the battery cell.
In a possible implementation manner, the second pole piece further includes a second tab, the at least two foil tabs are overlapped in the orthogonal projection direction of the battery cell, and the at least two foil tabs are connected to one of the second tabs.
In one possible embodiment, the at least two foil tabs are located on the same side of the thickness direction center line of the battery cell.
In a possible implementation manner, the second surface of the first current collector is further provided with the grooves, and the positions of the grooves provided on the first surface of the first current collector correspond to the positions of the grooves provided on the second surface of the first current collector.
In a possible embodiment, a length L1 of the groove disposed on the first surface of the first current collector is less than a length L2 of the groove disposed on the second surface of the first current collector, a difference between a length L1 of the groove disposed on the first surface of the first current collector and a length L2 of the groove disposed on the second surface of the first current collector is d1, and a value range of d1 is 0.01mm to 5 mm.
In a possible embodiment, a width H1 of the groove disposed on the first surface of the first current collector is less than a width H2 of the groove disposed on the second surface of the first current collector, a difference between a width H1 of the groove disposed on the first surface of the first current collector and a width H2 of the groove disposed on the second surface of the first current collector is d2, and a numerical range of d2 is 0.01mm to 5 mm.
In a possible implementation manner, a distance d3 is provided between the edge of the first tab and the edge corresponding to the groove on the first surface of the first current collector, and the value of d3 ranges from 0.1mm to 5 mm.
In a possible implementation manner, the tab further includes a gummed paper, at least a portion of the gummed paper is disposed on the surface of the first tab, and when the gummed paper is located on the first surface of the first current collector, a length L3 of the gummed paper is equal to a length L1+ δ 1 of a groove disposed on the first surface of the first current collector, and a numerical range of δ 1 is: delta 1 is more than or equal to 0 and less than or equal to 20 mm; the width H3 of the gummed paper is equal to the width H1+ δ 2 of the groove formed on the first surface of the first current collector, and the numerical range of δ 2 is as follows: delta 2 is more than or equal to 0 and less than or equal to 20 mm.
In a possible implementation manner, when the adhesive tape is located on the second surface of the first current collector, a length L3 of the adhesive tape is equal to a length L2+ δ 3 of a groove provided on the second surface of the first current collector, and a value range of δ 1 is as follows: delta 3 is more than or equal to 0 and less than or equal to 20 mm; the width H3 of the gummed paper is equal to the width H2+ δ 4 of the groove formed on the second surface of the first current collector, and the numerical range of δ 4 is as follows: delta 4 is more than or equal to 0 and less than or equal to 20 mm.
In one possible embodiment, the first electrode sheet is a positive electrode sheet, and the second electrode sheet is a negative electrode sheet; or the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece.
The utility model also provides a battery, including casing and foretell electric core, electric core holds in the casing.
The utility model provides an electric core and battery, through be provided with two at least above-mentioned foil electrode lugs on the second pole piece, such structure makes the current density distribution of second pole piece is more even, makes the potential distribution of second pole piece is more even, and the peripheral position current density and the potential distribution homogeneity of foil electrode lug at especially are better.
The utility model provides an electricity core and battery also can reduce in the second pole piece the risk of lithium is analysed to foil electrode lug peripheral position, improves the cycle life of battery, reduces battery safety risk, promotes the constant current charge time proportion, and then promotes the charge rate of battery.
In addition to the technical problems, technical features constituting technical solutions, and advantageous effects brought by the technical features of the technical solutions described above, other technical problems that can be solved by the battery cell and the battery provided by the embodiments of the present invention, other technical features included in the technical solutions, and advantageous effects brought by the technical features will be further described in detail in the detailed description of the embodiments of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a first pole piece according to an embodiment of the present invention;
fig. 2 is a top view of fig. 1 of a first pole piece provided in an embodiment of the present invention;
fig. 3 is a bottom view of fig. 1 of a first pole piece provided in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second pole piece according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a battery according to an embodiment of the present invention;
fig. 6 is an enlarged view of a partial structure of fig. 3 or fig. 2 of the first pole piece according to an embodiment of the present invention;
FIG. 7 is a current density distribution diagram of a battery of conventional construction;
FIG. 8 is a graph of the electrode potential distribution of a battery of conventional construction;
fig. 9 is a current density distribution diagram of a battery according to an embodiment of the present invention;
fig. 10 is a diagram illustrating an electrode potential distribution of a battery according to an embodiment of the present invention;
FIG. 11 is a graph of the charge curve of a battery made with a pole piece of conventional construction;
fig. 12 is a charging curve diagram of a battery according to an embodiment of the present invention.
Description of reference numerals:
100-electric core;
120-a first empty foil region;
130-pasting area;
140-a groove;
150-a second empty foil area;
200-a first tab;
300-a second tab;
310-foil tabs;
400-gummed paper;
510-a first pole piece;
511-a first current collector;
512-first active material layer;
520-a second pole piece;
521-a second current collector;
522-second active material layer;
530-membrane.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the battery, because the current density around the tabs on the negative plates in the first and second pole pieces 510 and 520 is much higher than that at other positions, and the electrode potential around the tabs is higher, lithium is easily separated from the positions of the negative tabs, which affects the cycle performance of the battery and brings about serious potential safety hazard. The number of the lugs on the negative plate and the proper position of the lugs on the negative plate can effectively reduce the ohmic internal resistance of the battery, reduce the polarization of the negative plate and reduce the problem of heat generation during the high-rate discharge of the battery, thereby improving the high-rate discharge capacity of the battery.
In view of the above background, the utility model provides a pair of electric core and battery, through set up first utmost point ear 200 on first pole piece 510, set up two at least foil utmost point ears 310 on second pole piece 520, two at least foil utmost point ears 310 are connected on a second utmost point ear 300, make on the negative pole piece especially around the foil utmost point ear 310 and the negative pole piece on the current density difference between other positions reduce, reduce the electrode potential around the negative pole piece, it is more even to make electrode potential and current density distribute at the negative pole piece different positions, thereby improve the high rate discharge capacity of battery, help prolonging the life of battery.
Referring to fig. 5, the utility model provides an electric core, including first pole piece 510, second pole piece 520 and diaphragm 530, first pole piece 510, second pole piece 520 and diaphragm 530 are range upon range of and the setting of coiling jointly, refer to fig. 1 and show, first pole piece 510 includes first mass flow body 511, first active substance layer 512 and first utmost point ear 200, be provided with first active substance layer 512 and recess 140 on the first face of first mass flow body 511, have the recess 140 that exposes first mass flow body 511 on the first active substance layer 512 of first face of first mass flow body 511, weld first utmost point ear 200 in the recess 140.
Referring to fig. 3, the second pole piece 520 includes a second current collector 521 and a second active material layer 522, the second active material layer 522 is disposed on the second current collector 521, and an edge of the second current collector 521 extends outward to form at least two foil tabs 310.
The utility model provides a pair of among electric core 100, through be provided with recess 140 on first mass flow body 511, set up first utmost point ear 200 in recess 140, the marginal outside extension of the second mass flow body 521 width direction of the body forms two at least foil utmost point ears 310, be favorable to reducing the internal resistance of battery, can effectively reduce current loss, make in the first pole piece 510 be close to the position around first utmost point ear 200 and keep away from the current density difference between the other positions of first utmost point ear 200 reduce, reduce the electrode potential around first utmost point ear 200 and the foil utmost point ear 310, make current density distribution more even and current density distribution more even on the different positions of second pole piece 520 on the different positions of first pole piece 510, improve the big multiplying power charge-discharge performance of battery.
In the embodiment, the ohmic internal resistance of the battery can be effectively reduced by increasing the number and the proper position of the foil tabs 310 in the second pole piece 520, the polarization of the second pole piece 520 is reduced, and the problem of heat generation during high-rate discharge of the battery is reduced, so that the high-rate discharge capacity of the battery is improved, and the service life of the battery is prolonged.
Referring to fig. 1, it is easily understood that the first side of the first current collector 511 is one of the front and back sides of the first current collector 511, and the second side of the first current collector 511 is the other of the front and back sides of the first current collector 511. The first surface of the first current collector 511 may have the pasted region 130 and the first empty foil region 120, the second surface of the first current collector 511 may have the pasted region 130 and the first empty foil region 120, and of course, both the first surface and the second surface of the first current collector 511 may have the pasted region 130 and the first empty foil region 120.
Specifically, the first empty foil area 120 may be located at one end or both ends of the pasting area 130 in the length direction of the first current collector 511, or the first empty foil area 120 may be located in the middle of the pasting area 130.
The groove 140 may be formed by physically scraping and cleaning the first current collector 511. The first current collector 511 is provided with at least two grooves 140, and may be provided with one groove 140 on a first surface of the first current collector 511, and also provided with one groove 140 on a second surface of the first current collector 511.
In a possible embodiment, the first tab 200 may be disposed in the groove 140 by welding, and of course, the first tab 200 may be disposed in the first empty foil area 120 by welding.
In one possible implementation, the first active material layer 512 and the groove 140 are disposed on the second surface of the first current collector 511.
Referring to fig. 4, in a possible implementation manner, the second current collector 521 further has a second empty foil area 150, the second empty foil area 150 is located at an edge of the second current collector 521 in the width direction, a second active material layer 522 is not attached to the surface of the second current collector 521 in the second empty foil area 150, the edge of the second current collector 521 extends outwards to form at least two foil tabs 310, and a plurality of foil tabs 310 may be arranged at intervals, and the plurality of foil tabs 310 are formed by die cutting. Such a configuration results in a more uniform current density distribution of the battery and a more uniform potential distribution of the second pole piece 520, particularly at the peripheral location of the foil tab 310. The structure can also reduce the risk of lithium precipitation of the second pole piece 520, particularly the peripheral position of the foil pole lug 310, improve the cycle life of the battery, reduce the safety risk of the battery, improve the constant current charging time proportion and further improve the charging speed of the battery.
The second empty foil area 150 is located at an edge of the second current collector 521 in the width direction, and the second empty foil area 150 may be located at one end of the second current collector 521 in the width direction.
The second pole piece 520 further includes a second pole tab 300, at least two foil pole tabs 310 are overlapped in the orthogonal projection direction of the battery cell 100, and at least two foil pole tabs 310 are connected to one second pole tab 300.
It is understood that the number of foil tabs 310 is at least 2, and may be 3, 4 or more. Such a plurality of foil tabs 310 are die cut at the widthwise edges of the second pole piece 520 by means of laser or knife die cutting. The plurality of foil tabs 310 are used to connect one first tab 200 after the second current collector 521 is wound to form a battery.
Referring to fig. 5, on the side projection of the battery cell 100, the side projection of the first tab 200 is located between the side projections of the two foil tabs 310. Such a structure allows the current density of the battery to be better.
Referring to fig. 5, the side projection of the battery cell 100 refers to a projection in the cell width direction, as indicated by arrow X in fig. 5.
The at least two foil tabs 310 are located on the same side of the center line of the battery cell 100 in the thickness direction, and the center line of the battery cell 100 in the thickness direction is shown by referring to a chain line in fig. 5. It is easy to understand that at least two foil tabs 310 may be located on the upper side of the center line of the battery cell 100 in the thickness direction, or at least two foil tabs 310 may be located on the lower side of the center line of the battery cell 100 in the thickness direction, which helps to improve the current density of the battery.
Referring to fig. 1, the grooves 140 on the first side of the first current collector 511 correspond in location to the grooves 140 on the second side of the first current collector 511, and the grooves 140 on the first side of the first current collector 511 are offset from the grooves 140 on the second side of the first current collector 511.
The length direction of the first current collector 511 is the width direction of the groove 140, and the width direction of the first current collector 511 is the length direction of the groove 140.
Referring to fig. 2 and 3, in one possible embodiment, the length L1 of the groove 140 disposed on the first surface of the first current collector 511 is less than the length L2 of the groove 140 disposed on the second surface of the first current collector 511, the difference between the length L1 of the groove 140 disposed on the first surface of the first current collector 511 and the length L2 of the groove 140 disposed on the second surface of the first current collector 511 is d1, and the value of d1 ranges from 0.01mm to 5 mm. For example, d1 has a value of 0.01mm, 1mm or 5 mm.
In one possible embodiment, the width H1 of the groove 140 disposed on the first surface of the first current collector 511 is less than the width H2 of the groove 140 disposed on the second surface of the first current collector 511, the difference between the width H1 of the groove 140 disposed on the first surface of the first current collector 511 and the width H2 of the groove 140 disposed on the second surface of the first current collector 511 is d2, and the value of d2 ranges from 0.01mm to 5 mm. For example, d2 has a value of 0.01mm, 2mm or 5 mm.
Referring to fig. 3 and 6, a distance d3 is provided between the edge of the first tab 200 and the edge of the first current collector 511 corresponding to the groove 140, and the value of d3 ranges from 0.1mm to 5 mm. For example: the value of d3 is 0.1mm, 3mm or 5 mm. It is easily understood that there is a distance d3 between both end edges of the first tab 200 and both end edges corresponding to the grooves 140 in the length direction of the first current collector 511. In the width direction of the first current collector 511, a distance d3 is provided between one end edge of the first tab 200 and the corresponding edge of the groove 140, and the other end of the first tab 200 extends out of the first current collector 511.
The distance d3 can prevent the edge of the first tab 200 from exceeding the range of the groove 140, and avoid affecting the normal use of the pole piece 100.
Referring to fig. 3 and fig. 6, in a possible implementation manner, the battery cell 100 further includes a gummed paper 400, at least a portion of the gummed paper 400 is disposed on the surface of the first tab 200, and when the gummed paper 400 is located on the first surface of the first current collector 511, a length L3 of the gummed paper 400 is equal to a length L1+ δ 1 of the groove 140 disposed on the first surface of the first current collector 511, where δ 1 is in a range of values: delta 1 is more than or equal to 0 and less than or equal to 20 mm; the width H3 of the adhesive tape is equal to the width H1+ δ 2 of the groove 140 provided on the first surface of the first current collector 511, and the numerical range of δ 2 is: delta 2 is more than or equal to 0 and less than or equal to 20 mm. δ 1 may be equal to 0, 10mm or 20mm, δ 2 may be equal to 0, 10mm or 20 mm.
When the adhesive tape 400 is located on the second surface of the first current collector 511, a length L3 of the adhesive tape 400 is equal to a length L2+ δ 3 of the groove 140 disposed on the second surface of the first current collector 511, and a numerical range of δ 1 is as follows: delta 3 is more than or equal to 0 and less than or equal to 20 mm; the width H3 of the adhesive tape is equal to the width H2+ δ 4 of the groove 140 provided on the second surface of the first current collector 511, and the numerical range of δ 4 is: delta 4 is more than or equal to 0 and less than or equal to 20 mm. For example, δ 3 may be equal to 0, 10mm or 20mm, δ 4 may be equal to 0, 10mm or 20 mm.
In one possible embodiment, the position of the groove 140 provided on the first surface of the first current collector 511 corresponds to the position of the groove 140 provided on the second surface of the first current collector 511, and the groove 140 is located in the middle of the first current collector 511 in the length direction.
The grooves 140 may be cleaned out using a doctor blade, and the grooves 140 are located at 1/4 through 3/4 along the length of the first current collector 511.
The first pole piece 510 is a positive pole piece, and the second pole piece 520 is a negative pole piece; or the first pole piece 510 is a negative pole piece and the second pole piece 520 is a positive pole piece.
The first tab 200 may be a positive tab or a negative tab, and when the first pole piece 510 is a positive plate and the second pole piece 520 is a negative plate, the first tab 200 is a positive tab and the second tab 300 is a negative tab.
When the first pole piece 510 is a negative pole piece and the second pole piece 520 is a positive pole piece, the first tab 200 is a negative pole tab and the second tab 300 is a positive pole tab.
Example one
When the first pole piece 510 is a positive pole piece:
the first current collector 511 has a first surface and a second surface, the first surface and the second surface of the first current collector 511 are both provided with a groove 140 at the position 1/2 along the length direction, the first tab 200 is welded in the groove 140 of the first surface in the middle, and the gummed paper 400 is pasted on the first tab 200. The width H1 of the groove 140 on the first surface of the first current collector 511 is greater than the width H2 of the groove 140 on the second surface of the first current collector 511, and the difference between the width H1 of the groove 140 on the first surface of the first current collector 511 and the width H2 of the groove 140 on the second surface of the first current collector 511 is d2 to be 2 mm. The length L1 of the groove 140 disposed on the first surface of the first current collector 511 is greater than the length L2 of the groove 140 disposed on the second surface of the first current collector 511, and the difference between the length L1 of the groove 140 disposed on the first surface of the first current collector 511 and the length L2 of the groove 140 disposed on the second surface of the first current collector 511 is d1 to be 1 mm.
When the adhesive tape 400 is located on the first surface of the first current collector 511, the length L3 of the adhesive tape 400 is greater than the length L1 of the groove 140 formed in the first surface of the first current collector 511, the difference between the length L3 of the adhesive tape 400 and the length L1 of the groove 140 formed in the first surface of the first current collector 511 is δ 1, and δ 1 is 3mm to 5 mm. The width H3 of the adhesive tape 400 is greater than the width H1 of the groove 140 on the first surface of the corresponding first current collector 511, the difference between the width H3 of the adhesive tape 400 and the width H1 of the groove 140 on the first surface of the corresponding first current collector 511 is δ 2, and δ 2 is 4mm to 5 mm.
Example two
The second pole piece 520 is a negative pole piece:
the second pole piece 520 is of a bipolar tab structure, that is, the edge of the second current collector 521 in the width direction is provided with a second empty foil area 150, and two foil tabs 310 are die-cut in the second empty foil area 150 by means of laser die-cutting, wherein one foil tab 310 is located at the position 1/4 in the length direction of the second current collector 521, and the other foil tab 310 is located at the position 1/2 in the length direction of the second current collector 521. The two foil tabs 310 are joined to a negative tab after the battery cell 100 is formed.
The adhesive tape 400 is further adhered to the second pole piece 520, so that when the second pole piece 520 and the first pole piece 510 are wound to form the battery cell 100, the adhesive tape 400 adhered to the second pole piece 520 is just overlapped with the first tab 200 on the first pole piece 510, the width of the adhesive tape 400 adhered to the second pole piece 520 is smaller than the width of the adhesive tape 400 on the first pole piece 510, the length of the adhesive tape 400 adhered to the second pole piece 520 is smaller than the length of the adhesive tape 400 on the first pole piece 510, and the length or the width covered by the adhesive tape 400 adhered to the second pole piece 520 at least on one side is 0.5mm to 3 mm.
The battery provided by the embodiment includes a casing and the battery core 100, where the casing is used to accommodate the battery core 100, an electrolyte is further injected into the casing, and the battery core 100 is immersed in the electrolyte.
Referring to fig. 5, a plurality of foil tabs 310 are overlapped in the orthogonal projection direction of the battery cell 100, and the plurality of foil tabs 310 are connected to one second tab 300. It is easy to understand that, a plurality of foil tabs 310 are die-cut in the second empty foil area 150 of the second tab 520 by means of laser or die cutting, and the plurality of foil tabs 310 coincide in the orthogonal projection direction of the battery cell 100, so that the plurality of foil tabs 310 are conveniently switched to one second tab 300, where the second tab 300 is a negative tab and a nickel-plated copper tab is adopted, so that the battery has only one negative tab after the battery is packaged.
In the present embodiment, the first electrode piece (510) and the second electrode piece (520 may be made of any material according to actual needs, and is not further limited herein.
For example, the active material in the active material layer in the negative electrode sheet may include graphite, hard carbon, silicon oxide, etc., and the active material in the active material layer in the positive electrode sheet may include materials such as lithium cobaltate, lithium iron phosphate, lithium manganate, etc.
The separator 530 may include a substrate, which may be a Polyethylene (PE) monolayer film, a polypropylene (PP) monolayer film, or a polypropylene-polyethylene-polypropylene three-layer composite film, and a coating layer, which may be at least one of porous silicon dioxide, aluminum oxide, titanium dioxide, and zirconium dioxide.
In order to verify the effect of the utility model, through the battery that provides to the battery of conventional structure and this embodiment, test analysis is carried out, fig. 7 is the current density distribution diagram of the battery that adopts conventional structure, fig. 8 is the electrode potential distribution diagram of the battery that adopts conventional structure, fig. 9 is the current density distribution diagram of the battery that adopts this embodiment to provide, specifically, refer to second pole piece 520 in embodiment 2 for the negative pole piece, the negative pole piece has the structure of 2 foil electrode lugs 310, fig. 10 is the electrode potential distribution diagram of the battery that adopts this embodiment to provide, specifically, refer to second pole piece 520 in embodiment 2 for the negative pole piece, the negative pole piece has the structure of 2 foil electrode lugs 310. Fig. 11 is a charge graph of a battery of a conventional structure, and fig. 12 is a charge graph of a battery provided by the present embodiment.
In fig. 7 to 10, M denotes a positive electrode tab, and N denotes a negative electrode tab.
As can be seen by comparing the current density distribution diagrams of fig. 7 and fig. 9, when the battery adopts the conventional structure, the current density in the peripheral area of the negative electrode tab N is greater than 60A/m2, and the closer to the negative electrode tab N, the higher the current density is, the more uneven the current distribution is; referring to fig. 9, when the battery provided by this embodiment is used, the current density in the area around the negative electrode tab N is less than 58A/m2, and the current density distribution is relatively uniform; it can be shown that the cell provided by the present embodiment can improve the uniformity of the current density distribution by structural improvement.
As can be seen by comparing the electrode potential distribution diagrams of fig. 8 and fig. 10, when the battery adopts a conventional structure, the electrode potential is greater than 4V in the peripheral region of the negative electrode tab N, and the closer to the negative electrode tab N, the higher the electrode potential is, the electrode potential is unevenly distributed; referring to fig. 10, when the battery provided by the present embodiment is used, as shown in fig. 9, the electrode potential is less than 3.99V in the peripheral region of the negative electrode tab N, and the electrode potential is distributed more uniformly; therefore, the battery provided by the embodiment can improve the uniformity of the electrode potential distribution.
Referring to fig. 11, it can be seen from the charging graph of the battery of the conventional structure that the battery of the conventional structure has a constant current charging time of about 916s and a total charging time of 4500 s; referring to fig. 12, it can be seen from the charging curve diagram of the battery provided in this embodiment that, when the battery provided in this embodiment is used, the constant current charging time is 1042s, and the total charging time 3625 s. The comparison shows that when the battery provided by the embodiment is adopted, the constant-current charging time is improved by 13.76%, the total charging time is reduced by 24%, and the quick charging effect is very obvious.
It should be noted that the numerical values and numerical ranges referred to in this application are approximate values, and there may be some error due to the manufacturing process, and the error may be considered to be negligible by those skilled in the art.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", and the like, which are used to indicate the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, and do not indicate or imply that the position or element referred to must have a particular orientation, be of particular construction and operation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (12)
1. An electric core, characterized by comprising a first pole piece (510), a second pole piece (520) and a diaphragm (530), wherein the first pole piece (510), the second pole piece (520) and the diaphragm (530) are stacked and wound together, the first pole piece (510) comprises a first current collector (511), a first active material layer (512) and a first tab (200), the first active material layer (512) and a groove (140) are arranged on a first surface of the first current collector (511), the groove (140) is an area of the first active material layer (512) exposed out of the first current collector (511), and the first tab (200) is welded in the groove (140);
the second pole piece (520) comprises a second current collector (521) and a second active substance layer (522), the second active substance layer (522) is arranged on the second current collector (521), and the edge of the second current collector (521) extends outwards to form at least two foil tabs (310).
2. The electrical core of claim 1, wherein, in a side projection of the electrical core (100), a side projection of the first tab (200) is located between side projections of the two foil tabs (310).
3. The electrical core of claim 1, wherein the second pole piece (520) further comprises a second tab (300), and the at least two foil tabs (310) coincide in an orthogonal projection direction of the electrical core (100), and the at least two foil tabs (310) are connected to one of the second tabs (300).
4. The electrical core of claim 1, wherein the at least two foil tabs (310) are located on the same side of a thickness-wise centerline of the electrical core (100).
5. The cell of claim 1, wherein the second surface of the first current collector (511) is further provided with the grooves (140), and the positions of the grooves (140) provided on the first surface of the first current collector (511) correspond to the positions of the grooves (140) provided on the second surface of the first current collector (511).
6. The battery cell of claim 5, wherein a length L1 of the groove (140) formed on the first surface of the first current collector (511) is less than a length L2 of the groove (140) formed on the second surface of the first current collector (511), a difference between a length L1 of the groove (140) formed on the first surface of the first current collector (511) and a length L2 of the groove (140) formed on the second surface of the first current collector (511) is d1, and a value of d1 ranges from 0.01mm to 5 mm.
7. The battery cell of claim 5, wherein a width H1 of the groove (140) formed on the first surface of the first current collector (511) is smaller than a width H2 of the groove (140) formed on the second surface of the first current collector (511), a difference between the width H1 of the groove (140) formed on the first surface of the first current collector (511) and the width H2 of the groove (140) formed on the second surface of the first current collector (511) is d2, and a value of d2 ranges from 0.01mm to 5 mm.
8. The cell of claim 1, wherein a distance d3 is provided between an edge of the first tab (200) and an edge of the first face of the first current collector (511) corresponding to the groove (140), and the value of d3 is in the range of 0.1mm to 5 mm.
9. The battery cell of claim 1, further comprising a gummed paper (400), wherein at least a portion of the gummed paper (400) is disposed on a surface of the first tab (200), and when the gummed paper (400) is located on the first surface of the first current collector (511), a length L3 of the gummed paper (400) is equal to a length L1+ δ 1, δ 1 of the groove (140) disposed on the first surface of the first current collector (511): delta 1 is more than or equal to 0 and less than or equal to 20 mm; the width H3 of the adhesive tape is equal to the width H1+ δ 2 of the groove (140) formed on the first surface of the first current collector (511), and the numerical range of δ 2 is as follows: delta 2 is more than or equal to 0 and less than or equal to 20 mm.
10. The battery cell of claim 9, wherein the adhesive tape (400) is located on the second surface of the first current collector (511), and a length L3 of the adhesive tape (400) is equal to a length L2+ δ 3 of the groove (140) formed on the second surface of the first current collector (511), and a value range of δ 1 is as follows: delta 3 is more than or equal to 0 and less than or equal to 20 mm; the width H3 of the adhesive tape is equal to the width H2+ δ 4 of the groove (140) formed on the second surface of the first current collector (511), and the numerical range of δ 4 is as follows: delta 4 is more than or equal to 0 and less than or equal to 20 mm.
11. The electrical core according to any of claims 1 to 10, wherein the first pole piece (510) is a positive pole piece, and the second pole piece (520) is a negative pole piece; or
The first pole piece (510) is a negative pole piece, and the second pole piece (520) is a positive pole piece.
12. A battery, characterized in that it comprises a casing and a cell (100) according to any one of claims 1 to 11, said cell (100) being housed inside said casing.
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| CN202120932043.9U CN214589165U (en) | 2021-04-30 | 2021-04-30 | Battery cell and battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120932043.9U CN214589165U (en) | 2021-04-30 | 2021-04-30 | Battery cell and battery |
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| CN214589165U true CN214589165U (en) | 2021-11-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114039080A (en) * | 2021-11-05 | 2022-02-11 | 宁德新能源科技有限公司 | Electricity core, battery and power consumption device |
| CN114068859A (en) * | 2021-11-18 | 2022-02-18 | 珠海冠宇电池股份有限公司 | Positive plate and battery |
| CN114188501A (en) * | 2021-11-23 | 2022-03-15 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN114447399A (en) * | 2022-01-28 | 2022-05-06 | 宁德新能源科技有限公司 | Electrochemical device and electronic apparatus |
| WO2023088433A1 (en) * | 2021-11-18 | 2023-05-25 | 珠海冠宇电池股份有限公司 | Plate and battery |
| WO2023088431A1 (en) * | 2021-11-18 | 2023-05-25 | 珠海冠宇电池股份有限公司 | Core and battery |
| WO2023102780A1 (en) * | 2021-12-08 | 2023-06-15 | 东莞新能源科技有限公司 | Electrochemical device and electronic device |
| WO2024067403A1 (en) * | 2022-09-29 | 2024-04-04 | 惠州市豪鹏科技有限公司 | Electrode plate and battery |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114039080A (en) * | 2021-11-05 | 2022-02-11 | 宁德新能源科技有限公司 | Electricity core, battery and power consumption device |
| CN114039080B (en) * | 2021-11-05 | 2022-07-19 | 宁德新能源科技有限公司 | Electricity core, battery and power consumption device |
| CN114068859A (en) * | 2021-11-18 | 2022-02-18 | 珠海冠宇电池股份有限公司 | Positive plate and battery |
| WO2023088433A1 (en) * | 2021-11-18 | 2023-05-25 | 珠海冠宇电池股份有限公司 | Plate and battery |
| WO2023088431A1 (en) * | 2021-11-18 | 2023-05-25 | 珠海冠宇电池股份有限公司 | Core and battery |
| CN114188501A (en) * | 2021-11-23 | 2022-03-15 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| WO2023102780A1 (en) * | 2021-12-08 | 2023-06-15 | 东莞新能源科技有限公司 | Electrochemical device and electronic device |
| CN114447399A (en) * | 2022-01-28 | 2022-05-06 | 宁德新能源科技有限公司 | Electrochemical device and electronic apparatus |
| EP4220848A1 (en) * | 2022-01-28 | 2023-08-02 | Ningde Amperex Technology Ltd. | Electrochemical apparatus and electronic device |
| WO2024067403A1 (en) * | 2022-09-29 | 2024-04-04 | 惠州市豪鹏科技有限公司 | Electrode plate and battery |
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