CN207338527U - Battery core and secondary cell - Google Patents
Battery core and secondary cell Download PDFInfo
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- CN207338527U CN207338527U CN201721399019.3U CN201721399019U CN207338527U CN 207338527 U CN207338527 U CN 207338527U CN 201721399019 U CN201721399019 U CN 201721399019U CN 207338527 U CN207338527 U CN 207338527U
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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
This application involves energy storage device technical field, more particularly to a kind of battery core and secondary cell.Battery core includes the first pole piece and the second pole piece, and first pole piece is oppositely arranged with second pole piece, and first pole piece is equipped with the first groove, in the width direction, the projection of first pole piece and the projection no overlap area of second pole piece.Battery core provided herein, by setting the first groove on the first pole piece, when secondary cell circulates, even if the first pole piece and the second pole piece are expanded, due to the setting of the first groove, can make in electrolyte flow to the first groove for squeezing out, therefore, remain able to ensure the effect of impregnation between the first pole piece and the second pole piece, so as to avoid the increase of lithium ion transport impedance as far as possible, reduce the influence to secondary cell dynamic performance.
Description
Technical field
This application involves energy storage device production technical field, more particularly to a kind of battery core and secondary cell.
Background technology
With the development of society, the electric automobile with zero-emission, high-environmental and low cost is subject to people more and more
Favor, therefore, as the lithium-ion-power cell of electric automobile core component, especially secondary cell, its high-energy-density
Gradually cause strongly pursuing for each cart enterprise and power battery producer.Secondary cell includes positive plate, negative plate, isolation film, electricity
Solve liquid and shell, the method for common raisings secondary cell energy density be use thick coating (i.e. the thickness of active layer is larger) and
Improve space availability ratio.
However, after using this structure, the thickness of positive plate, cathode pole piece along secondary cell in secondary cell cyclic process
Direction expands, and the structure design of space-efficient, positive plate, negative plate is limited by shell and severe crush occurs,
Cause electrolyte to extrude, cause the infiltration between positive plate and negative plate to be deteriorated, lithium ion transport impedance increase, influences secondary electricity
The dynamic performance in pond.
Utility model content
This application provides a kind of battery core and secondary cell, can solve the above problems.
The first aspect of the application provides a kind of battery core, including：
First pole piece；
Second pole piece；
First pole piece is oppositely arranged with second pole piece, and first pole piece is equipped with the first groove, along width side
To the projection of first pole piece and the projection no overlap area of second pole piece.
Preferably, second pole piece is equipped with the second groove.
Preferably, in first pole piece and second pole piece that are disposed adjacent, through-thickness, first groove
Opening it is opposite with the opening of second groove, first groove be arranged at first pole piece towards second pole
First groove of the one side of piece, second groove are the one side for being arranged at second pole piece towards first pole piece
Second groove；
Wherein, the thickness direction is vertical with the width.
Preferably, first groove and second groove are equipped with multiple, and multiple first grooves are described in
Width is arranged at intervals；Multiple second grooves are arranged at intervals along the width.
Preferably, along its length, first groove is projected as arc with least one in the projection of second groove
Shape structure, trapezium structure or rectangular configuration；
Wherein, the length direction is vertical with the width.
Preferably, first groove is not more than the width of first pole piece along the sum of size of the width
Half；
And/or
Second groove along the sum of size of the width no more than second pole piece width two/
One.
Preferably, the size of first groove and the second groove through-thickness is no more than 10um；
Wherein, the thickness direction is vertical with the width.
Preferably, the extending direction of first groove is consistent with length direction；
And/or
The extending direction of second groove is consistent with the length direction；
Wherein, the length direction is vertical with the width.
Preferably, the thickness of first pole piece and/or second pole piece is not more than 160um.
The second aspect of the application provides a kind of secondary cell, including such as above-mentioned any one of them battery core.
The technical solution that the application provides can reach following beneficial effect：
Battery core provided herein, by setting the first groove on the first pole piece, when secondary cell circulates, even if
First pole piece and the second pole piece are expanded, and due to the setting of the first groove, can make the electrolyte flow that squeezes out to
In one groove, therefore, remain able to ensure the effect of impregnation between the first pole piece and the second pole piece, thus avoid as far as possible lithium from
The increase of sub- transfer impedance, reduces the influence to secondary cell dynamic performance.
It should be appreciated that the general description and following detailed description of the above are only exemplary, this can not be limited
Application.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of specific embodiment of secondary cell provided herein；
Fig. 2 is the structure diagram of another specific embodiment of secondary cell provided herein；
Fig. 3 is a kind of structure diagram of specific embodiment of battery core provided herein；
Fig. 4 is the structure diagram of another specific embodiment of battery core provided herein；
Fig. 5 is the sectional view of the line A-A along Fig. 3；
Fig. 6 is the structure diagram of another specific embodiment of battery core provided herein；
Fig. 7 is the structure diagram of another specific embodiment of battery core provided herein；
Fig. 8 is the structure diagram of another specific embodiment of battery core provided herein；
Fig. 9 is the structure diagram of battery core in comparative example.
Reference numeral：
10- battery cores；
The first pole pieces of 11-；
The first grooves of 111-；
The first collectors of 112-；
The first active layers of 113-；
The second pole pieces of 12-；
The second grooves of 121-；
The second collectors of 122-；
The second active layers of 123-；
13- isolation films；
20- housings；
The first poles of 30-；
The second poles of 40-.
Attached drawing herein is merged in specification and forms the part of this specification, shows the implementation for meeting the application
Example, and be used to together with specification to explain the principle of the application.
Embodiment
The application is described in further detail below by specific embodiment and with reference to attached drawing.
As shown in figures 3-8, the embodiment of the present application provides a kind of battery core 10, including the first pole piece 11 and the second pole piece 12,
First pole piece 11 is oppositely arranged with the second pole piece 12, and the first pole piece 11 is equipped with the first groove 111, i.e. the first pole piece 11 it is opposite two
Face can be equipped with the first groove 111, only can also simultaneously be equipped with the first groove 111.X in the width direction, the first pole piece 11
Projection and the projection no overlap area of the second pole piece 12, usually, the first pole piece 11, the second pole piece 12 are formed by flaky belt material
, above-mentioned width X is vertical with the length direction Z of flaky belt material, and vertical with the thickness direction Y of flaky belt material, meanwhile, it is thick
It is vertical with length direction Z to spend direction Y.
Above-mentioned battery core 20 on the first pole piece 11 by setting the first groove 111, when secondary cell circulates, even if first
11 and second pole piece 12 of pole piece expands, and due to the setting of the first groove 111, can make the electrolyte flow that squeezes out to
In one groove 111, therefore, remain able to ensure the effect of impregnation of the first pole piece 11 and the second pole piece 12, so as to avoid as far as possible
The increase of lithium ion transport impedance；And due to being provided with the first groove 111, the first pole piece 11 and the second pole piece can be alleviated
The stress of active layer on 12, reduces the influence to secondary cell dynamic performance.
It is to be appreciated that battery core 10 further includes the isolation film 13 being arranged between the first pole piece 11 and the second pole piece 12, with
Completely cut off the first pole piece 11 and the second pole piece 12.Above-mentioned battery core 10 can be takeup type battery core, as shown in figure 3, i.e. the first pole piece 11,
13 and second pole piece 12 of isolation film forms battery core 10 by winding method；Battery core 10 can also be lamination type electric core, such as Fig. 4 institutes
Show, i.e. the first pole piece 11,13 and second pole piece 12 of isolation film form battery core 10 by lamination process.
Further, the second pole piece 12 is equipped with the second groove 121, by increasing by the second groove 121, in 11 He of the first pole piece
When second pole piece 12 expands, the accommodation space of bigger can be provided for the electrolyte being squeezed out, and then prevent electrolyte
It is extruded between the first pole piece 11 and the second pole piece 12, so as to ensure the infiltration effect of the first pole piece 11 and the second pole piece 12 as far as possible
Fruit.Wherein, the second pole piece 12 only can simultaneously be equipped with the second groove 121, can also opposite two sides be equipped with the second groove
121。
Specifically, the first pole piece 11 includes the first collector 112 and the first active layer being formed on the first collector 112
113, the first collector 112 includes opposite both sides, can be equipped with the first activity in the side of the first collector 112 or both sides
Layer 113, the first groove 111 is arranged on the first active layer 113.In general, the first active layer 113 is away from the first collector 112
It is simultaneously relatively flat, as shown in figure 9, one side of first active layer 113 away from the first collector 112 is planar structure.And this Shen
Please in, the first active layer 113 of at least side of the first collector 112 is equipped with the first groove 111, i.e. first active layer 113
One side away from the first collector 112 is uneven, which is provided with the first groove 111, that is to say, that in the first collector 112
When both sides are equipped with the first active layer 113, the first groove 111 can be equipped with the first active layer 113 of side, the of opposite side
One side of one active layer 113 away from the first collector 112 is planar structure, as shown in Figure 8；Or the first active layer of both sides
113 are equipped with the first groove 111, as illustrated in figs. 5-7.
Similarly, the second pole piece 12 includes the second collector 122 and the second active layer being formed on the second collector 122
123, the second active layer 123 can be equipped with the side of the second collector 122 or both sides.In general, the second active layer 123 is remote
The one side of second collector 122 is relatively flat, as shown in figure 9, one side of second active layer 123 away from the second collector 122 is
Planar structure., can be remote with the second active layer 123 of both sides when being equipped with the second active layer 123 in the both sides of the second collector 122
One side from the second collector 122 is planar structure, as shown in Figure 9；Can also the second active layer 123 of only side be equipped with
Second groove 121, one side of the second active layer 123 of opposite side away from the second collector 122 are planar structure, as shown in Figure 8；
Or the second groove 121 is equipped with the second active layer 123 of both sides, as illustrated in figs. 5-7.In the second collector 122 only side
When setting the second active layer 123, the second groove 121 is arranged on second active layer 123.
No matter which kind of above-mentioned mode, along above-mentioned width X, the projection and the projection of the second pole piece 12 of the first pole piece 11
It will not overlap, that is to say, that through-thickness Y, the first pole piece 11 will not be stretched into the second groove 121 of the second pole piece 12, the
Two pole pieces 12 will not be stretched into the first groove 111 of the first pole piece 11.
A kind of embodiment, in the first pole piece 11 and the second pole piece 12 that are disposed adjacent, through-thickness Y, the first groove 111
Opening it is opposite with the opening of the second groove 121, first groove 111 be arranged at the first pole piece 11 towards the second pole piece 12
The first groove 111 simultaneously, second groove 121 are the second recessed of the one side that is arranged at the second pole piece 12 towards the first pole piece 11
Groove 121.That is, in the first pole piece 11 and the second pole piece 12 that are disposed adjacent, the first pole piece 11 is towards the second pole piece 12
The first groove 111 is simultaneously provided with, i.e. the side of the first collector 112 towards the second collector 122 is provided with the first active layer
113, and first active layer 113 is equipped with the first groove 111；It is recessed that the one side of second pole piece 12 towards the first pole piece 11 is equipped with second
Groove 121, i.e. the second collector 122 are equipped with the second active layer 123, and second active layer towards the side of the first collector 112
123 are equipped with the second groove 121, and the opening of 111 and second groove 121 of the first groove is opposite, as illustrated in figs. 5-7.First afflux
The opposite side of body 112 can set the first active layer 113, the first active layer 113 can not also be set, equipped with the first active layer
When 113, which can be equipped with the first groove 111, can also first active layer 113 away from the first collector
112 side is planar structure；The opposite side of second collector 122 can set the second active layer 123, can not also set
Two active layers 123, when equipped with the second active layer 123, which can be equipped with the second groove 121, can also be somebody's turn to do
Side of second active layer 123 away from the second collector 122 is planar structure.Using this structure, the quantity of groove is added,
The accommodation space of bigger can be provided for the electrolyte squeezed out, so as to be further ensured that the first pole piece 11 and the second pole piece 12
Effect of impregnation.
Another embodiment, as shown in figure 8, in adjacent the first pole piece 11 and the second pole piece 12, the first pole piece 11 only court
The one side of second pole piece 12 is provided with the first groove 111, i.e. the side of the first collector 112 towards the second collector 122 is set
There is the first active layer 113, and first active layer 113 is equipped with the first groove 111；Second pole piece 12 is only away from the first pole piece 11
The second groove 121 is simultaneously provided with, i.e. the second collector 122 is equipped with the second active layer away from the side of the first collector 112
123, and second active layer 123 is equipped with the second groove 121.The opposite side of first collector 112 can set the first active layer
113, the first active layer 113 can not also be set, and when equipped with the first active layer 113, first active layer 113 is away from the first collection
The side of fluid 112 is planar structure；The opposite side of second collector 122 can set the second active layer 123, can not also set
The second active layer 123 is put, when equipped with the second active layer 123, side of second active layer 123 away from the second collector 122
For planar structure.Using this structure, the first groove 111 is equipped with the first pole piece 11 only one side, the second pole piece 12 is only simultaneously set
When having the second groove 121, make the electrolyte accommodation space between the first pole piece 11 and the second pole piece 12 after winding or lamination
Than more uniform, so that the electrolyte squeezed out is more evenly distributed between the first pole piece 11 and the second pole piece 12, protect as far as possible
Demonstrate,prove effect of impregnation of the electrolyte to the first pole piece 11 and the second pole piece 12.
Further, above-mentioned first groove, 111 and second groove 121 can be respectively equipped with multiple, i.e., on the first pole piece 11
The first groove 111 can be equipped with it is multiple, and multiple first grooves 111 in the width direction X be arranged at intervals；On second pole piece 12
Second groove 121 can also be equipped with it is multiple, multiple second grooves 121 in the width direction X be arranged at intervals, so further increase recessed
The quantity of groove, to provide the accommodation space of bigger for the electrolyte that squeezes out.It is of course also possible to only the first groove 111 or only
Second groove 121 is equipped with multiple.
Z along its length, it is at least one in the projection of the first groove 111 and the second groove 121 to be projected as arcuate structure, ladder
Shape structure or rectangular configuration, the i.e. structure of the first groove 111 and the second groove 121 can be identical, as the projection of the two is
Arcuate structure, trapezium structure or rectangular configuration.The projection of the two can not also be same, and such as the first groove 111 is projected as arc
Structure, the second groove 121 are projected as trapezium structure.As shown in figure 5, the projection of the first groove 111 and the second groove 121 is
Rectangular configuration；As shown in fig. 6, the projection of the first groove 111 and the second groove 121 is trapezium structure；As shown in fig. 7, first
The projection of 111 and second groove 121 of groove is arcuate structure.When the first groove 111 and the second groove 121 for trapezium structure or
During person's rectangular configuration, the space of groove is larger, using the teaching of the invention it is possible to provide larger accommodation space, so as to ensure electrolyte to the first pole piece 11
With the effect of impregnation of the second pole piece 12.In the first groove 111 and when being projected as arcuate structure of the second groove 121, due to first
Groove 111, the slot bottom of the second groove 121 do not have horn structure, can further alleviate the first active layer 113 and the second active layer
123 stress, and then improve the mechanical property of the first pole piece 11 and the second pole piece 12.Certainly, the first groove 111 and the second groove
121 can also be other polymorphic structures.When the first groove 111, the second groove 121 are respectively equipped with multiple, Z along its length,
The projection of multiple first grooves 111 can be identical with structure, can also structure it is different, the projection of multiple second grooves 121 can tie
Structure is identical, can also structure difference.
It is to be appreciated that if the first groove 111 is too big in the area shared by whole first collector, 112 surface, can subtract
The amount of small active material, influences the energy density of secondary cell, and therefore, the sum of size of X is not no in the width direction for the first groove 111
More than the half of the width of the first pole piece 11, such as the sum of size of X is equal to the first pole piece to the first groove 111 in the width direction
11 half, 1/3rd, a quarter etc..Similarly, the sum of size of X is not more than the second groove 121 in the width direction
The half of the width of second pole piece 12, the sum of size of X is equal to the second pole piece 12 in the width direction such as the second groove 121
The half of width, 1/3rd, a quarter etc., to ensure the amount of the active material of the second pole piece 12 as far as possible, are improved
The energy density of secondary cell.Wherein, the width of the first pole piece 11 refers to size of first pole piece 11 along above-mentioned width X, the
The width of two pole pieces 12 refers to size of second pole piece 12 along above-mentioned width X.
Further, if the depth of the first groove 111 and the second groove 121 is too big, the first groove 111 and the second groove
The motion path of the lithium ion of 121 slot bottom will be elongated, the resistance of increase lithium ion movement, in order to avoid the above problem, the
The size of 121 through-thickness Y of one groove 111 and the second groove is no more than 10um, such as 10um, 8um, 6um, 5um, 3um.When
So, when being provided only with the first groove 111,10um can be not more than with the size of 111 through-thickness Y of the first groove.
Usually, the thickness of the first pole piece 11 and the second pole piece 12 is not more than 160um, as 160un, 150um, 120um,
100um, 80um, 50um etc..After above-mentioned setting, it is molded in battery core 10, when being molded especially by winding method, this is thick
First pole piece 11 of degree and the pliability of the second pole piece 12 are preferable, do not have too big internal stress, therefore be conducive to battery core 10
Shaping.Only 160um can also be not more than by the thickness of the first pole piece 11 or the second pole piece 12.Wherein, the thickness of the first pole piece 11
For the thickness of the first collector 112 and the sum of the thickness of the first active layer 113, the thickness of the second pole piece 12 is the second collector
The sum of thickness of 122 thickness and the second active layer 123.
The extending direction of above-mentioned first groove 111 can be in an inclination angle, alternatively, the first groove 111 with length direction Z
Extending direction is consistent with length direction Z, i.e., the first groove 111 is straight-line groove, and parallel with length direction Z.Due to the first activity
Layer 113 is general to be formed on the first collector 112 by the way of coating, using the set-up mode of above-mentioned first groove 111, is applied
The deposition path for covering head is straight line, and consistent with the direction of feed of the sheet stock of the first pole piece 11, in this way, easy to coat the control of head
System.
Similarly, the extending direction of the second groove 121 is consistent with length direction Z, i.e. the second groove 121 is straight-line groove, and with
Length direction Z is parallel.Using the set-up mode of above-mentioned second groove 121, the deposition path for coating head is straight line, and with the second pole
The direction of feed of the sheet stock of piece 12 is consistent, in this way, easy to coat the control of head.
Certainly, the first groove 111, the second groove 121 can also be curved groove；First active layer 113, the second active layer
123 formed can also use print by the way of be formed at the first collector 112, on the second collector 122.
It should be noted that above-mentioned first pole piece 11 can be positive plate, the second pole piece 12 is negative plate, can also first
Pole piece 11 is negative plate, and the second pole piece 12 is positive plate.
As shown in Figs. 1-2, present invention also provides a kind of secondary cell, the secondary cell to include any of the above-described embodiment
Battery core 10.Secondary cell further includes housing 20, the first pole 30, the second pole 40 and electrolyte, and housing 20 can be square
Housing, as shown in Figure 2；Can also be the housing that side wall has arcwall face, as shown in Figure 1.Battery core 10 is contained in housing 20, and one
As, stacked molding battery core 10 as shown in Figure 4 is accommodated in square casing；Housing with arcwall face is accommodated such as Fig. 3 institutes
The battery core 10 formed by winding method shown.First pole 30 and the second pole 40 respectively with the first pole piece 11 and the second pole piece
12 connections, and the first pole 30 and the second pole 40 stretch out the outside of housing 20, and electrolyte is filled with housing 20, infiltrate each the
One pole piece 11 and each second pole piece 12.Usually, after battery core 10 is installed on housing 20, above-mentioned width X and secondary cell
Short transverse it is consistent.
Below by experiment to the secondary cell and the secondary cell (conventional arrangement of two of comparative example using the application
Primary cell) cycle-index and energy density tested, refer to table 1, wherein, the first pole of first, second, third embodiment
The both sides of first collector 112 of piece 11 are equipped with the first active layer 113, and each first active layer 113 is equipped with the first groove
111, the both sides of the second collector 123 of the second pole piece 12 are equipped with the second active layer 123, and each second active layer 123 is equipped with
Second groove 121, along the length direction Z of the first pole piece 11, the projection of the first groove 111 of first embodiment and the second groove
121 projection is rectangular configuration, as shown in Figure 5；The projection of first groove 111 of second embodiment and the second groove 121
Projection is trapezium structure, as shown in Figure 6；The projection of first groove 111 of 3rd embodiment and the projection of the second groove 121 are equal
For arcuate structure, as shown in Figure 7.The both sides of first collector 112 of the first pole piece 11 of first, second comparative example are equipped with
One active layer 113, one side of each first active layer 113 away from the first collector 112 are planar structure, and the of the second pole piece 12
The both sides of two collectors 122 are equipped with the second active layer 123, and one side of each second active layer 123 away from the second collector 122 is equal
For planar structure, as shown in figure 9, unlike, the first active layer 113, the thickness of the second active layer 123 of the first comparative example are
The maximum gauge D1 of first active layer 113 of first embodiment, the first active layer 113, the second active layer 123 of the second comparative example
Thickness for first embodiment the first active layer 113 minimum thickness D2.
Table 1
| Cycle-index (decays to 80%) | Energy density (Wh/Kg) | |
| First embodiment | 2500 | 220 |
| Second embodiment | 2500 | 220 |
| 3rd embodiment | 2500 | 220 |
| First comparative example | 1000 | 230 |
| Second comparative example | 2500 | 170 |
By experimental result, the cycle performance performance of first, second, third embodiment is good, mainly due to the
One pole piece 11 and the second pole piece 12 are provided with the first groove 111 and the second groove 121,111 and second groove 121 of the first groove
Be conducive to the storage of electrolyte, especially in the case of space-efficient, the first pole piece 11 can be alleviated and the second pole piece 12 is swollen
It is subject to the problem of extruding of housing 20 causes electrolyte non-wetting, pole piece dynamic performance decline and capacity attenuation is fast after swollen；Together
When, the first groove 111, the second groove 121 are reduced when the first pole piece 11 and the second pole piece 12 expand to the compressive plane of housing 20
Product, so as to reduce expansive force.And the first comparative example does not have electrolyte memory channel, expanded in the first pole piece 11 and the second pole piece 12
When, the first pole piece 11 and the second pole piece 12 are in close contact, larger and high in the thickness of the first active layer 113, the second active layer 123
In the case of space availability ratio, the later stage is prone to analyse lithium diving secondary cell in the circulating cycle, and capacity attenuation is fast.Second comparative example
In, although the first active layer 113, the thickness of the second active layer 123 are smaller, the cycle performance of secondary cell is guaranteed,
The energy density of secondary cell but can not meet requirement.
The foregoing is merely the preferred embodiment of the application, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
- A kind of 1. battery core, it is characterised in that includingFirst pole piece；Second pole piece；First pole piece is oppositely arranged with second pole piece, and first pole piece is equipped with the first groove, in the width direction, institute State projection and the projection no overlap area of second pole piece of the first pole piece.
- 2. battery core according to claim 1, it is characterised in that second pole piece is equipped with the second groove.
- 3. battery core according to claim 2, it is characterised in that first pole piece being disposed adjacent and second pole piece In, through-thickness, the opening of first groove is opposite with the opening of second groove, and first groove is to be arranged at For first pole piece towards first groove of the one side of second pole piece, second groove is to be arranged at described second Second groove of the pole piece towards the one side of first pole piece；Wherein, the thickness direction is vertical with the width.
- 4. battery core according to claim 2, it is characterised in that first groove and second groove are equipped with more It is a, and multiple first grooves are arranged at intervals along the width；Multiple second grooves are along between the width Every setting.
- 5. battery core according to claim 2, it is characterised in that along its length, first groove and described second recessed It is at least one in the projection of groove to be projected as arcuate structure, trapezium structure or rectangular configuration；Wherein, the length direction is vertical with the width.
- 6. according to claim 2-5 any one of them battery cores, it is characterised in that first groove is along the width Half of the sum of the size no more than the width of first pole piece；And/orHalf of second groove along the sum of size of the width no more than the width of second pole piece.
- 7. according to claim 2-5 any one of them battery cores, it is characterised in that first groove and the second groove edge The size of thickness direction is no more than 10um；Wherein, the thickness direction is vertical with the width.
- 8. according to claim 2-5 any one of them battery cores, it is characterised in that the extending direction and length of first groove Direction is consistent；And/orThe extending direction of second groove is consistent with the length direction；Wherein, the length direction is vertical with the width.
- 9. according to claim 1-5 any one of them battery cores, it is characterised in that first pole piece and/or second pole The thickness of piece is not more than 160um.
- 10. a kind of secondary cell, it is characterised in that including such as claim 1-9 any one of them battery core.
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| CN201721399019.3U CN207338527U (en) | 2017-10-27 | 2017-10-27 | Battery core and secondary cell |
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| CN201721399019.3U CN207338527U (en) | 2017-10-27 | 2017-10-27 | Battery core and secondary cell |
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| CN110797478A (en) * | 2018-08-01 | 2020-02-14 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| CN111540909A (en) * | 2020-05-21 | 2020-08-14 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, battery core and battery |
| CN114122322A (en) * | 2021-11-25 | 2022-03-01 | 珠海冠宇电池股份有限公司 | Battery pole piece and battery |
| WO2023045418A1 (en) * | 2021-09-27 | 2023-03-30 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery, and electric apparatus |
| WO2024077493A1 (en) * | 2022-10-11 | 2024-04-18 | 宁德时代新能源科技股份有限公司 | Negative electrode sheet, lithium-ion battery and electric device |
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| CN109768223A (en) * | 2019-03-15 | 2019-05-17 | 湖北锂诺新能源科技有限公司 | A kind of preparation method of coiled lithium ion battery cathode pole piece |
| CN111540909A (en) * | 2020-05-21 | 2020-08-14 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, battery core and battery |
| WO2023045418A1 (en) * | 2021-09-27 | 2023-03-30 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery, and electric apparatus |
| CN114122322A (en) * | 2021-11-25 | 2022-03-01 | 珠海冠宇电池股份有限公司 | Battery pole piece and battery |
| WO2024077493A1 (en) * | 2022-10-11 | 2024-04-18 | 宁德时代新能源科技股份有限公司 | Negative electrode sheet, lithium-ion battery and electric device |
| WO2024113484A1 (en) * | 2022-11-30 | 2024-06-06 | 宁德时代新能源科技股份有限公司 | Electrode sheet, roller part, electrode assembly, battery cell, battery, and electric device |
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