CN117239220B - Battery core - Google Patents
Battery core Download PDFInfo
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- CN117239220B CN117239220B CN202311509609.7A CN202311509609A CN117239220B CN 117239220 B CN117239220 B CN 117239220B CN 202311509609 A CN202311509609 A CN 202311509609A CN 117239220 B CN117239220 B CN 117239220B
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- 239000000758 substrate Substances 0.000 claims abstract description 20
- 239000012528 membrane Substances 0.000 claims description 99
- 230000007423 decrease Effects 0.000 claims description 25
- 210000000746 body region Anatomy 0.000 claims description 12
- 230000003247 decreasing effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 abstract description 12
- 238000009825 accumulation Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000005286 illumination Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 13
- 238000009826 distribution Methods 0.000 description 10
- 238000013459 approach Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 238000005253 cladding Methods 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides a battery cell, which solves the technical problem that the separator of a laminated battery cell in the prior art causes the edge of the separator to shrink thermally due to heat accumulation, so that the contact of a positive electrode plate is short-circuited. The invention provides a battery cell, wherein a diaphragm in the battery cell is provided with a main body area and a first area positioned on at least one side of the main body area, the refractive index of a diaphragm substrate in the first area is smaller than that of a diaphragm substrate in the main body area, the higher refractive index of the diaphragm substrate can improve the energy conversion efficiency of the edge of the diaphragm, meanwhile, the heat accumulation under illumination can be reduced, the temperature rise of the edge of the diaphragm is reduced, thereby avoiding the heat accumulation of the diaphragm in the charging and discharging process, preventing the diaphragm from heat shrinkage, and improving the safety performance of a battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an electric core.
Background
The lithium ion battery has the advantages of high specific energy, low discharge, good cycle performance and the like, and is widely applied to the fields of consumer electronics, new energy automobiles, energy storage power stations and the like. Along with the deep advancement of double carbon, the development of the lithium ion battery is powerful and gradually advances to the aspects of quick charge, long service life, high energy density and high safety.
In the production process of the laminated battery cell, the situation that the diaphragms exceed the pole pieces too much (more than the design requirement) can occur, if the laminated battery cell is directly connected into a shell for packaging or assembling, the packaging of an aluminum plastic film or the welding of a shell can be influenced by the redundant diaphragms, and therefore, the redundant diaphragms are required to be cut. In the production of the battery cell, the traditional production of the diaphragm adopts a cutter for cutting, the effect of the notch of the diaphragm is poor, burrs or curling are easy to occur, and the burrs of the pole piece easily penetrate from the position where the burrs or curling of the diaphragm occur to contact with another pole piece, so that short circuit of the positive and negative electrodes is caused; in addition, in the falling test process of the laminated battery cell, the diaphragm layer positioned in the middle is easy to be stressed and broken, so that short circuit is caused; in addition, in the high-rate charge and discharge process of the laminated battery cell, heat generated by the pole pieces can be conducted to the diaphragm, so that the heat of the diaphragm is accumulated, and the edge of the diaphragm is caused to generate a thermal shrinkage phenomenon, so that the positive pole piece and the negative pole piece at the edge are in contact to be in short circuit.
Disclosure of Invention
In view of the above, the invention provides a battery cell, which solves the problem that the separator of the laminated battery cell in the prior art causes the edge of the separator to shrink thermally due to heat accumulation, so that the contact of the positive electrode plate is short-circuited.
As a first aspect of the present invention, the present invention provides a battery cell including: at least one first pole piece, at least one second pole piece and at least one diaphragm are overlapped, the polarities of the adjacent first pole piece and the adjacent second pole piece are opposite, and the adjacent first pole piece and the adjacent second pole piece are separated by the diaphragm; the diaphragm is provided with a main body area and a first area positioned on at least one side of the main body area, wherein the refractive index of the diaphragm base material of the first area is smaller than that of the diaphragm base material of the main body area.
In an embodiment of the present invention, in a stacking direction, a plurality of diaphragms are divided into a first diaphragm area, a second diaphragm area, and a third diaphragm area, wherein the third diaphragm area is located between the first diaphragm area and the second diaphragm area; wherein the average width of the first region of the membrane within the first membrane region is less than or equal to the average width of the first region of the membrane within the third membrane region; and/or the average width of the first region of the membrane in the second membrane region is less than or equal to the average width of the first region of the membrane in the third membrane region.
In an embodiment of the invention, a maximum value of the width of the first region in the first membrane region is less than or equal to a minimum value of the width of the first region of the membrane in the third membrane region; and/or a maximum value of the width of the first region of the membrane in the second membrane region is less than or equal to a minimum value of the width of the first region of the membrane in the third membrane region.
In an embodiment of the present invention, a width of the first area of the diaphragm in the first diaphragm area is 1/10 to 1/2 of a width of the first area of the diaphragm in the third diaphragm area; and/or the width of the first area of the diaphragm in the second diaphragm area is 1/10-1/2 of the width of the first area of the diaphragm in the third diaphragm area.
In one embodiment of the invention, the width of the first region of the diaphragm within the first diaphragm region increases in a first direction from away from the third diaphragm region to towards the third diaphragm region; and/or the width of the first region of the membrane in the second membrane region increases in a second direction away from the third membrane region to close to the third membrane region.
In one embodiment of the present invention, the absolute value of the difference between the widths of the first areas of two adjacent diaphragms is between 0.010mm and 1 mm.
In one embodiment of the invention, the width of the first region of the membrane in the third membrane region is increased and decreased in a third direction from the first membrane region to the second membrane region.
In an embodiment of the present invention, a length of the diaphragm in the first diaphragm area is 1 to 1.5 times that of the diaphragm in the third diaphragm area; and/or the length of the diaphragm in the second diaphragm area is equal to 1-1.5 times of the length of the diaphragm in the third diaphragm area.
In one embodiment of the invention, the length of the membrane within the first membrane region decreases in a first direction from the third membrane region to near the third membrane region; and/or the length of the membrane within the second membrane region decreases in a second direction away from the third membrane region to near the third membrane region.
In one embodiment of the invention, the length of the membrane in the third membrane region decreases and then increases in a third direction from the first membrane region to the second membrane region.
In an embodiment of the present invention, a distance between a boundary of a diaphragm in the first diaphragm area and a boundary of an adjacent first pole piece is 1/5 to 1/2 of a distance between a boundary of a diaphragm in the third diaphragm area and a boundary of an adjacent first pole piece; and/or the spacing between the boundary of the diaphragm in the second diaphragm area and the boundary of the adjacent first pole piece is 1/5-1/2 of the spacing between the boundary of the diaphragm in the third diaphragm area and the boundary of the adjacent first pole piece.
In one embodiment of the present invention, the distance between the boundary of the diaphragm in the first diaphragm region and the boundary of the adjacent first pole piece decreases in the first direction from the third diaphragm region to the third diaphragm region; and/or decreasing the spacing between the boundary of the diaphragm within the second diaphragm region and the boundary of the adjacent first pole piece in a second direction away from the third diaphragm region to close to the third diaphragm region.
In one embodiment of the present invention, one end of at least two of the diaphragms is collected at one side of the battery cell; one end of at least two of the diaphragms is bonded.
In one embodiment of the present invention, one end of all the diaphragms is gathered at one side middle part of the battery cell.
In an embodiment of the present invention, the refractive index of the separator substrate in the main body area is 1.49-1.60, and/or the refractive index of the separator substrate in the first area is less than or equal to 1.40.
In one embodiment of the invention, the first region has a hardness greater than the hardness of the body region.
The invention provides a battery cell, wherein a diaphragm in the battery cell is provided with a main body area and a first area positioned on at least one side of the main body area, wherein the refractive index of a diaphragm substrate in the first area is smaller than that of a diaphragm substrate in the main body area, the higher refractive index of the diaphragm substrate can improve the energy conversion efficiency of the edge of the diaphragm, and meanwhile, the heat accumulation under illumination can be reduced, the temperature rise of the edge of the diaphragm is reduced, so that the heat accumulation of the diaphragm in the charging and discharging process is avoided, the thermal shrinkage of the diaphragm is prevented, and the safety performance of a battery is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following more particular description of embodiments of the present invention, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, and not constitute a limitation to the invention. In the drawings, like reference numerals generally refer to like parts or steps.
Fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a battery cell according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a battery cell according to another embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a battery cell according to another embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a battery cell according to another embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a battery cell according to another embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a battery cell according to another embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a battery cell according to another embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a battery cell according to another embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a battery cell according to another embodiment of the present invention.
Fig. 11 is a schematic structural diagram of a battery cell according to another embodiment of the present invention.
Reference numerals:
10-first pole piece, 11-second pole piece, 12-diaphragm, 121-second region, 122-first region, 123-body region, Q1-first diaphragm region, Q2-second diaphragm region, Q3-third diaphragm region.
Detailed Description
In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. All directional indications (such as up, down, left, right, front, rear, top, bottom … …) in embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the figures), and if the particular gesture changes, the directional indication changes accordingly. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Furthermore, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The manner in which embodiments of the present invention are described will now be described more fully hereinafter with reference to the accompanying drawings, in which it is shown, however, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As a first aspect of the present invention, as shown in fig. 1 to 10, the present invention provides a battery cell, as shown in fig. 1 to 10, comprising: at least one first pole piece 10, at least one second pole piece 11 and at least one diaphragm 12 are arranged in a superposition manner, the polarities of the adjacent first pole piece 10 and second pole piece 11 are opposite, and the adjacent first pole piece 10 and second pole piece 11 are separated by the diaphragm 12; specifically, the first pole piece 10 is a positive pole piece, and the second pole piece 11 is a negative pole piece; or the first electrode sheet 10 is a negative electrode sheet, and the second electrode sheet 11 is a positive electrode sheet, so long as the polarities of the first electrode sheet 10 and the second electrode sheet 11 are opposite.
Wherein the membrane 12 has a body region and a first region 122 on at least one side of the body region and a second region 121 on a side of the first region remote from the body region, optionally the first region 122 having a width of less than 200 μm.
In one embodiment, separator 12 includes a substrate layer and a ceramic layer and a glue layer disposed on the substrate layer. In one example, the ceramic layer of the separator and the positive electrode active material layer of the positive electrode sheet are disposed opposite; the adhesive layer of the diaphragm and the negative electrode active material layer of the negative electrode plate are arranged oppositely.
The diaphragm in the battery cell between the first pole piece and the second pole piece is provided with a main body area and a first area which is positioned on at least one side of the main body area, and the refractive index of the diaphragm base material of the first area is smaller than that of the diaphragm base material of the main body area.
The substrate refractive index of the separator in a lithium ion battery is used to characterize the transparent properties of the separator. The transparency of a diaphragm refers to the degree of light transmission of the diaphragm, i.e. the ability of the diaphragm to transmit light. The transparent performance of the separator has important influence on the charge and discharge efficiency and the safety of the lithium ion battery. The higher diaphragm substrate refractive index of the first region can improve the energy conversion efficiency of the edge of the diaphragm, meanwhile, the heat accumulation under illumination can be reduced, and the temperature rise of the edge of the diaphragm is reduced, so that the heat accumulation of the diaphragm in the charge and discharge process is avoided, the thermal shrinkage of the diaphragm is prevented, and the safety performance of the battery is improved.
Optionally, the first region 122 of the diaphragm 12 has a hardness greater than the hardness of the body region 123 of the diaphragm, so that the first region 122 at the middle edge of the diaphragm 12 is more resistant to penetration by burrs than the body region 123, thereby reducing the probability of a short circuit occurring as a result of burrs on the pole piece passing through the edge of the diaphragm 12.
In an embodiment of the present invention, the plurality of diaphragms 12 are divided into a first diaphragm area Q1, a second diaphragm area Q2, and a third diaphragm area Q3 in the stacking direction, wherein the third diaphragm area Q3 is located between the first diaphragm area Q1 and the second diaphragm area Q2. The average width of the first areas 122 of the diaphragms in the first diaphragm area Q1 is less than or equal to the average width of the first areas 122 of the diaphragms in the third diaphragm area Q3, for example, three diaphragms are included in the first diaphragm area Q1, the widths of the first areas of the three diaphragms are d11, d12, d13, respectively, four diaphragms are included in the third diaphragm area Q3, and the widths of the first areas of the four diaphragms are d31, d32, d33, d34, respectively, wherein, (d11+d12+d13)/3 is less than or equal to (d31+d32+d33+d34)/4. And/or the average width of the first region 122 of the membrane in the second membrane region Q2 is less than or equal to the average width of the first region 122 of the membrane in the third membrane region Q3, for example, two membranes are included in the second membrane region Q2, the widths of the first regions of the two membranes are d21, d22 respectively, three membranes are included in the third membrane region Q3, and the widths of the first regions of the three membranes are d31, d32, d33 respectively, then (d21+d22)/2 is less than or equal to (d31+d32+d33)/3.
In an embodiment of the present invention, the plurality of diaphragms 12 are divided into a first diaphragm area Q1, a second diaphragm area Q2, and a third diaphragm area Q3 in the stacking direction, wherein the third diaphragm area Q3 is located between the first diaphragm area Q1 and the second diaphragm area Q2. The maximum value of the width of the first region 122 of the diaphragm in the first diaphragm region Q1 is smaller than or equal to the minimum value of the width of the first region 122 of the diaphragm in the third diaphragm region Q3, for example, the first diaphragm region Q1 includes three diaphragms, the widths of the first regions of the three diaphragms are d11, d12 and d13 respectively, wherein d11 < d12 < d13, the third diaphragm region Q3 includes four diaphragms, and the widths of the first regions of the four diaphragms are d31, d32, d33 and d34 respectively, wherein d31 < d32=d33 < d34, and then d13 is equal to or smaller than d31. And/or the maximum value of the width of the first region 122 of the diaphragm within the second diaphragm region Q2 is less than or equal to the minimum value of the width of the first region 122 of the diaphragm within the third diaphragm region Q3, for example, two diaphragms are included in the second diaphragm region Q2, the widths of the first regions of the two diaphragms are d21 and d22 respectively, wherein d21 < d22, three diaphragms are included in the third diaphragm region Q3, the widths of the first regions of the three diaphragms are d31, d32 and d33 respectively, wherein d31 < d32 < d33, and then d22 is less than or equal to d31.
Optionally, the number of the diaphragms in the third diaphragm area Q3 is greater than the number of the diaphragms in the first diaphragm area Q1, and the number of the diaphragms in the third diaphragm area Q3 is greater than the number of the diaphragms in the second diaphragm area Q2, that is, the number of the diaphragms in the middle area is greater than the number of the diaphragms in the two side areas in the chip structure, so that the supporting function can be achieved, the diaphragms in the middle area are prevented from being broken more easily due to the extrusion function, and burrs on the pole pieces are prevented from penetrating through the diaphragms.
Alternatively, the number of the diaphragms in the first diaphragm area Q1 may be the same as the number of the diaphragms in the second diaphragm area Q2, that is, the diaphragms of the chip structure located on both sides of the third diaphragm area Q3 are uniformly distributed in number.
Alternatively, the number of diaphragms in the first diaphragm area Q1 may be different from the number of diaphragms in the second diaphragm area Q2.
According to the battery cell provided by the invention, the diaphragm 12 in the battery cell is divided into three diaphragm 12 areas, the maximum value of the width of the first area 122 of the diaphragm 12 in the first diaphragm area Q1 and the second diaphragm area Q2 which are positioned at two sides of the third diaphragm area Q3 is smaller than or equal to the minimum value of the width of the first area 122 of the diaphragm 12 in the third diaphragm area Q3, so that the diaphragm 12 in the middle area is prevented from being broken more easily due to the extrusion action, burrs on a pole piece are prevented from penetrating through the diaphragm 12, the occurrence probability of short circuit of the battery cell is further reduced, the anti-pressure interference capability of the diaphragm 12 in the third diaphragm area Q3 is improved, and the safety performance of the battery cell is improved. Meanwhile, the refractive index of the separator substrate of the first region 122 is smaller than that of the separator substrate of the body region 123. Specifically, the refractive index of the separator substrate in the main body region 123 is 1.49-1.60, and the refractive index of the separator substrate in the first region 122 is less than or equal to 1.40. In addition to the difference in refractive index between the first region 122 and the main body region 123, the following differences are also present: after the separator of the main body region 123 is baked at 90 ℃ for 24 hours, the transverse shrinkage rate is about 1%, and the longitudinal shrinkage rate is 3% -7%. After baking the separator of the first region 122 at 90 ℃ for 24 hours, the transverse shrinkage and the longitudinal shrinkage are close to 0.
Optionally, the width of the first area 122 of the diaphragm in the first diaphragm area Q1 is 1/10 to 1/2 of the width of the first area 122 of the diaphragm in the third diaphragm area Q3, so that the first area 122 of the diaphragm 12 with the smallest width in the first diaphragm area Q1 may not be lower than the control range of the interval between the boundary of the diaphragm 12 and the boundary of the adjacent first pole piece, and also not be lower than the control range of the interval between the boundary of the diaphragm 12 and the boundary of the adjacent second pole piece, so as to reduce the probability of poor coverage of the diaphragm 12.
Similarly, the width of the first region 122 of the diaphragm in the second diaphragm region Q2 is 1/10 to 1/2 of the width of the first region 122 of the diaphragm in the third diaphragm region Q3, and the first region 122 of the diaphragm 12 having the smallest width in the first region 122 of the second diaphragm region Q2 is not brought down beyond the control range of the interval between the boundary of the diaphragm 12 and the boundary of the adjacent first pole piece, nor brought down beyond the control range of the interval between the boundary of the diaphragm 12 and the boundary of the adjacent second pole piece, so as to reduce the probability of poor coverage of the diaphragm 12.
Alternatively, the width of the first region 122 of the diaphragm in the first diaphragm region Q1 may be distributed as follows: as shown in fig. 2, the width of the first region 122 of the diaphragm in the first diaphragm region Q1 increases gradually in the first direction from the third diaphragm region Q3 to the vicinity of the third diaphragm region Q3, that is, the width of the first region 122 of the diaphragm in the first diaphragm region Q1 increases gradually as the vicinity of the third diaphragm region Q3 increases.
Alternatively, the width of the first region 122 of the diaphragm in the second diaphragm region Q2 may be distributed as follows: as shown in fig. 3, the width of the first region 122 of the diaphragm in the second diaphragm region Q2 increases gradually in the second direction from the third diaphragm region Q3 to the vicinity of the third diaphragm region Q3, that is, the width of the first region 122 of the diaphragm in the second diaphragm region Q2 increases gradually as the vicinity of the third diaphragm region Q3 increases.
Optionally, the width of the first region 122 of the membrane in the third membrane region Q3 is distributed as follows: as shown in fig. 1, in the third direction with the first diaphragm region Q1 to the second diaphragm region Q2, the width of the first region 122 of the diaphragm in the third diaphragm region Q3 decreases and then increases. That is, when 3 or more diaphragms are included in the third diaphragm region Q3, the width of the first region 122 of the diaphragm within the third diaphragm region Q3 increases and decreases.
In the same cell, the above-described distribution pattern of the widths of the first regions 122 of the separator in the first separator region Q1, the width distribution pattern of the first regions 122 of the separator in the second separator region Q2, and the width distribution pattern of the first regions 122 of the separator in the third separator region Q3 may be satisfied at the same time, or one or 2 of them may be satisfied, for example:
as shown in fig. 1, 3, 5, and 6, in a first direction from the third diaphragm area Q3 to the vicinity of the third diaphragm area Q3 (it is to be explained that the first direction is directed toward the third diaphragm area Q3 with the first diaphragm area Q1 as a starting point), the width of the first area 122 of the diaphragm in the first diaphragm area Q1 is gradually increased, that is, the width of the first area 122 of the diaphragm in the first diaphragm area Q1 is gradually increased as the vicinity of the third diaphragm area Q3 is provided; and the width of the first region 122 of the diaphragm in the second diaphragm region Q2 increases in a second direction from the third diaphragm region Q3 to the vicinity of the third diaphragm region Q3 (it is to be explained that the second direction is directed toward the third diaphragm region Q3 starting from the second diaphragm region Q2), that is, the width of the first region of the diaphragm in the second diaphragm region Q2 increases in an increasing manner as the vicinity of the third diaphragm region Q3. In the third direction from the first diaphragm area Q1 to the second diaphragm area Q2 (it should be explained that the third direction is from the first diaphragm area Q1 to the second diaphragm area Q2, and since the second diaphragm area Q2 is located on the other side of the third diaphragm area Q3, the first direction is the same as the third direction, i.e. the third direction is the same as the first direction), the width of the first area 122 of the diaphragm in the third diaphragm area Q3 increases and decreases.
As also shown in fig. 2, the width of the first region 122 of the diaphragm in the second diaphragm region Q2 gradually increases as it approaches the third diaphragm region Q3. In the third direction with the first diaphragm region Q1 to the second diaphragm region Q2, the width of the first region 122 of the diaphragm in the third diaphragm region Q3 is gradually increased and then gradually decreased. Although the widths of the first regions 122 of the diaphragms in the first diaphragm region Q1 are each smaller than the widths of the first regions 122 of the diaphragms in the third diaphragm region Q3, the widths of the first regions 122 of the diaphragms in the first diaphragm region Q1 are decreased.
As also shown in fig. 4: the width of the first region 122 of the diaphragm in the first diaphragm region Q1 gradually increases as it approaches the third diaphragm region Q3. In the third direction with the first diaphragm region Q1 to the second diaphragm region Q2, the width of the first region 122 of the diaphragm in the third diaphragm region Q3 is gradually increased and then gradually decreased. Although the widths of the first regions 122 of the diaphragms in the second diaphragm region Q2 are each smaller than the widths of the first regions 122 of the diaphragms in the third diaphragm region Q3, the widths of the first regions 122 of the diaphragms in the second diaphragm region Q2 are decreased.
Optionally, the width of the first region 122 of the membrane in the first membrane region Q1, the width of the first region 122 of the membrane in the second membrane region Q2, and the width of the first region 122 of the membrane in the third membrane region Q3 are distributed in the same cell, and the width of the first region 122 of the membrane in the first membrane region Q1 is increased in a first direction from the third membrane region Q3 to the third membrane region Q3 when the membranes in the same cell are all satisfied; the width of the first region 122 of the diaphragm within the second diaphragm region Q2 increases in a second direction from the third diaphragm region Q3 to near the third diaphragm region Q3; in the third direction with the first diaphragm region Q1 to the second diaphragm region Q2, the width of the first region 122 in the third diaphragm region Q3 increases and decreases, as shown in fig. 1, 3, 5, and 6, for example. A group of diaphragms symmetrical about the third diaphragm area Q3 (one diaphragm in the group of diaphragms is located in the first diaphragm area Q1, and the other diaphragm is located in the second diaphragm area Q2) has a width distribution form as follows:
(1) As shown in fig. 3, the widths of the first regions 122 in any one of the sets of diaphragms symmetrical about the third diaphragm region Q3 (one of the sets of diaphragms is located in the first diaphragm region Q1 and the other diaphragm is located in the second diaphragm region Q2) are different.
(2) As shown in fig. 5, one of the plurality of sets of diaphragms symmetrical about the third diaphragm region Q3 (one of the plurality of sets of diaphragms is located in the first diaphragm region Q1 and the other diaphragm is located in the second diaphragm region Q2) has the same width as the first region 122.
(3) As shown in fig. 6, any one of the plurality of sets of diaphragms symmetrical about the third diaphragm region Q3 (one of the plurality of diaphragms is located in the first diaphragm region Q1 and the other diaphragm is located in the second diaphragm region Q2) has the same width as the first region 122.
Optionally, the absolute value of the difference between the widths of the first areas 122 of two adjacent membranes 12 is between 0.010mm and 1mm, so that the first area 122 of the membrane 12 with the smallest first area 122 is not cut off beyond the control range of the spacing between the boundary of the membrane 12 and the boundary of the adjacent first pole piece, and is not cut off beyond the control range of the spacing between the boundary of the membrane 12 and the boundary of the adjacent second pole piece, so as to reduce the probability of poor coverage of the membrane 12.
In another embodiment of the present invention, as shown in fig. 7, 8 and 9, the length of the diaphragm in the first diaphragm area Q1 is 1 to 1.5 times the length of the diaphragm in the third diaphragm area Q3, i.e. l1=1 to 1.5l3; and/or the length of the diaphragm in the second diaphragm region Q2 is equal to 1 to 1.5 times the length of the diaphragm in the third diaphragm region Q3, i.e., l2=1 to 1.5l3.
Specifically, the length of any one of the diaphragms in the first diaphragm region Q1 may be 1 to 1.5 times the length of one of the diaphragms in the third diaphragm region Q3.
For example, if the first diaphragm area Q1 includes 2 diaphragms and the third diaphragm area Q3 includes 3 diaphragms, the length of one diaphragm in the first diaphragm area Q1 need only be 1 to 1.5 times the length of one diaphragm in the third diaphragm area Q3. The length of each diaphragm in the first diaphragm region Q1 may be the same or different.
Similarly, the length of any one of the second diaphragm regions Q2 may be 1 to 1.5 times the length of one of the third diaphragm regions Q3.
For example, the second diaphragm area Q2 includes 2 diaphragms, and the third diaphragm area Q3 includes 3 diaphragms, and then the length of the diaphragm in the second diaphragm area Q2 is only 1 to 1.5 times the length of one of the diaphragms in the third diaphragm area Q3. The length of each diaphragm in the second diaphragm region Q2 may be the same or different.
According to the battery cell provided by the invention, the lengths of the diaphragms in the third diaphragm area Q3, the diaphragms in the second diaphragm area Q2 and the diaphragms 12 in the first diaphragm area Q1 are different, the lengths of the diaphragms 12 at two sides are large, and the lengths of the diaphragms 12 at the middle are small, so that all the diaphragms 12 can be gathered at one side of the battery cell to form a cladding structure, the anti-falling capacity of a battery is improved, and the safety of the battery is improved.
Optionally, the lengths of the diaphragms in the first diaphragm area Q1 are distributed as follows:
as shown in fig. 7, the length of the diaphragm in the first diaphragm region Q1 decreases in the first direction from the third diaphragm region Q3 to the near third diaphragm region Q3; i.e. the closer to the third diaphragm region Q3, the shorter the length of the diaphragm.
Alternatively, as shown in fig. 8, the length distribution of the separator in the second separator region Q2 is as follows:
the length of the diaphragm in the second diaphragm region Q2 decreases in the second direction from the third diaphragm region Q3 to the vicinity of the third diaphragm region Q3. I.e. the closer to the third diaphragm region Q3, the shorter the length of the diaphragm.
Alternatively, as shown in fig. 7, the length of the third diaphragm in the third diaphragm region Q3 is distributed as follows: in the third direction with the first diaphragm region Q1 to the second diaphragm region Q2, the lengths of the diaphragms in the third diaphragm region Q3 decrease and then increase. For example, when the third diaphragm region Q3 includes 3 or more diaphragms, the length of the diaphragms in the third diaphragm region Q3 is decreased and then increased. If the third diaphragm area Q3 includes an odd number of diaphragms, the length of the diaphragm located at the middle of the third diaphragm area Q3 is the smallest, and then the length of the diaphragm increases in sequence in the direction toward the first diaphragm area Q1 based on the middle diaphragm, and similarly the length of the diaphragm increases in sequence in the direction toward the second diaphragm area Q2 based on the middle diaphragm.
The length distribution pattern of the separator in the first separator region Q1, the length distribution pattern of the separator in the second separator region Q2, and the length distribution pattern of the separator in the third separator region Q3 described above may be satisfied simultaneously or may satisfy one or 2 of them in the same cell, for example:
as shown in fig. 7, in the first direction from the third diaphragm area Q3 to the vicinity of the third diaphragm area Q3, the length of the diaphragm in the first diaphragm area Q1 decreases, that is, the length of the diaphragm in the first diaphragm area Q1 decreases gradually as it approaches the third diaphragm area Q3; and the length of the diaphragm in the second diaphragm region Q2 decreases in the second direction from the third diaphragm region Q3 to near the third diaphragm region Q3, i.e., the length of the diaphragm in the second diaphragm region Q2 decreases as it approaches the third diaphragm region Q3. In the third direction with the first diaphragm region Q1 to the second diaphragm region Q2, the lengths of the diaphragms in the third diaphragm region Q3 decrease and then increase. I.e., the length of the middle-most one of the diaphragms 12 in the whole cell is minimized and then sequentially increased toward both sides.
Alternatively, as shown in fig. 10, the leftmost side of all of the membranes 12 in the entire cell may form a first concentric arc and the rightmost side of all of the membranes 12 in the entire cell may form a second concentric arc. The diameter of the first concentric circular arc may be the same as or different from the diameter of the second concentric circular arc. All diaphragms 12 can be gathered at the center of one side of the battery cell, namely, two sides of the cladding structure are gathered towards the middle, a multi-layer composite bonding layer is integrally formed, the bonding layer has certain bonding strength, the single-layer bonding strength is more than or equal to 0.002N/mm, and the pole piece can be fixed and wrapped in the falling process of the battery cell, so that the pole piece is prevented from falling out, and the falling performance and the safety performance of the battery cell are improved.
As also shown in fig. 8, the length of the diaphragm in the second diaphragm region Q2 decreases as it approaches the third diaphragm region Q3. In the third direction with the first diaphragm region Q1 to the second diaphragm region Q2, the lengths of the diaphragms in the third diaphragm region Q3 decrease and then increase. Although the length of the diaphragm in the first diaphragm region Q1 is 1 to 1.5 times the length of the diaphragm in the third diaphragm region Q3, the lengths of the plurality of diaphragms in the first diaphragm region Q1 do not have an increasing or decreasing relationship.
As also shown in fig. 9: the closer to the third diaphragm region Q3, the length of the diaphragm in the first diaphragm region Q1 decreases. In the third direction with the first diaphragm region Q1 to the second diaphragm region Q2, the lengths of the diaphragms in the third diaphragm region Q3 decrease and then increase. Although the length of the diaphragm in the second diaphragm region Q2 is 1 to 1.5 times the length of the diaphragm in the third diaphragm region Q3, the lengths of the plurality of diaphragms in the second diaphragm region Q2 are not in an increasing or decreasing relationship.
In another embodiment of the present invention, a distance between a boundary of a diaphragm in the first diaphragm area Q1 and a boundary of an adjacent first pole piece is 1/5 to 1/2 of a distance between a boundary of a three diaphragm in the third diaphragm area Q3 and a boundary of an adjacent first pole piece; and/or
The distance between the boundary of the diaphragm in the second diaphragm area Q2 and the boundary of the adjacent first pole piece is 1/5-1/2 of the distance between the boundary of the diaphragm in the third diaphragm area Q3 and the boundary of the adjacent first pole piece.
Specifically, the distance between the boundary of any one diaphragm in the first diaphragm area Q1 and the boundary of the adjacent first pole piece is equal to 1/5-1/2 of the distance between the boundary of one diaphragm in the third diaphragm area Q3 and the boundary of the adjacent first pole piece.
For example, if the first diaphragm region Q1 includes 2 diaphragms and the third diaphragm region Q3 includes 3 diaphragms, the spacing between the boundary of one diaphragm in the first diaphragm region Q1 and the boundary of the adjacent first pole piece need only be equal to the spacing between the boundary of one diaphragm in the third diaphragm region Q3 and the boundary of the adjacent first pole piece. The spacing between the boundary of the diaphragm in the same first diaphragm region Q1 and the boundary of the adjacent first pole piece may be the same or different.
Similarly, the negative electrode coverage of any one of the second diaphragm areas Q2 is equal to 1/5-1/2 of the distance between the boundary of one of the diaphragms in the third diaphragm area Q3 and the boundary of the adjacent first pole piece.
For example, where the second diaphragm region Q2 includes 2 diaphragms and the third diaphragm region Q3 includes 3 diaphragms, then the spacing between the boundary of one diaphragm in the second diaphragm region Q2 and the boundary of the adjacent first pole piece need only be equal to the spacing between the boundary of one diaphragm in the third diaphragm region Q3 and the boundary of the adjacent first pole piece. The spacing between the boundary of the diaphragm in the same second diaphragm region Q2 and the boundary of the adjacent first pole piece may be the same or different.
Optionally, the spacing between the boundary of the diaphragm in the first diaphragm region Q1 and the boundary of the adjacent first pole piece is distributed as follows:
the distance between the boundary of the diaphragm in the first diaphragm region Q1 and the boundary of the adjacent first pole piece decreases in the first direction from the third diaphragm region Q3 to the vicinity of the third diaphragm region Q3; i.e., closer to the third diaphragm region Q3, the spacing between the boundary of the diaphragm and the boundary of the adjacent first pole piece is smaller.
Optionally, the spacing between the boundary of the diaphragm in the second diaphragm region Q2 and the boundary of the adjacent first pole piece is distributed as follows:
in a second direction from the third diaphragm region Q3 to near the third diaphragm region Q3, the spacing between the boundary of the diaphragm in the second diaphragm region Q2 and the boundary of the adjacent first pole piece decreases. I.e., closer to the third diaphragm region Q3, the spacing between the boundary of the diaphragm and the boundary of the adjacent first pole piece is smaller.
In the same cell, the above-described interval distribution pattern between the boundary of the diaphragm in the first diaphragm region Q1 and the boundary of the adjacent first pole piece, and the interval distribution pattern between the boundary of the diaphragm in the second diaphragm region Q2 and the boundary of the adjacent first pole piece may be satisfied at the same time, or may satisfy one of them.
Alternatively, the difference in spacing between the boundary of adjacent two diaphragms 12 and the boundary of adjacent first pole pieces is 1/10 of the very poor of the whole cell, so that the alignment of the whole cell is increased.
In another embodiment of the present invention, as shown in fig. 11, in the cell, one ends of at least two diaphragms 12 are gathered at one side of the cell, and one ends of at least two diaphragms are bonded. One end of at least two diaphragms 12 is gathered together, and at least two diaphragms 12 gathered together can form a cladding structure for the battery cell, so that the anti-falling capability of the battery cell is improved, and the safety of the battery cell is improved.
Alternatively, as shown in fig. 11, when the lengths of the separators 12 in the cells are distributed as shown in fig. 10, that is, the lengths of the separators 12 on the two sides gradually increase with the shortest length of the separator 12 on the middle of the cells. One end of all the diaphragms 12 are gathered in the center of one side of the cell (i.e., the position corresponding to the diaphragm 12 in the middle of the cell), and the other end of all the diaphragms 12 are gathered in the middle of the other side of the cell (i.e., the position corresponding to the diaphragm 12 in the middle of the cell). All diaphragms 12 can be gathered at the middle part of one side of the battery cell, namely, two sides of the cladding structure are gathered towards the middle, and a multi-layer composite bonding layer is integrally formed, wherein the bonding layer has certain bonding strength, the single-layer bonding strength is more than or equal to 0.002N/mm, and the pole piece can be fixed and wrapped in the falling process of the battery cell, so that the pole piece is prevented from falling out, and the falling performance and the safety performance of the battery cell are improved.
As a second aspect of the present invention, the present invention also provides a battery including a case; and the battery cell is arranged in the shell. Because the battery includes the electric core, the battery includes the technical characteristics of the electric core, and the technical effect of the battery is the same as the beneficial effect brought by the electric core, and the description is omitted here.
As a third aspect of the present invention, the present invention further provides a battery module including a plurality of the above-mentioned batteries, and having the technical effects of the above-mentioned batteries, which are not described herein again.
As a fourth aspect of the present invention, the present invention also provides a battery pack including a plurality of the above-described battery modules.
As a fifth aspect of the present invention, the present invention further provides an electronic product, including the battery described above, where the battery provides electric energy for the electronic product.
The basic principles of the present invention have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be considered as essential to the various embodiments of the present invention. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the invention is not necessarily limited to practice with the above described specific details.
The block diagrams of the devices, apparatuses, devices, systems referred to in the present invention are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
It is also noted that in the apparatus, devices and methods of the present invention, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent means of the present invention.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features herein.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, etc. within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (15)
1. A cell, comprising: at least one first pole piece, at least one second pole piece and at least one diaphragm are overlapped, the polarities of the adjacent first pole piece and the adjacent second pole piece are opposite, and the adjacent first pole piece and the adjacent second pole piece are separated by the diaphragm;
wherein the diaphragm is provided with a main body area, a first area positioned on at least one side of the main body area and a second area positioned on one side of the first area away from the main body area, wherein the refractive index of a diaphragm substrate of the first area is smaller than that of the diaphragm substrate of the main body area;
dividing a plurality of diaphragms into a first diaphragm region, a second diaphragm region and a third diaphragm region in a superposition direction, wherein the third diaphragm region is positioned between the first diaphragm region and the second diaphragm region;
wherein the average width of the first region of the membrane in the first membrane region is less than or equal to the average width of the first region of the membrane in the third membrane region; and/or
The average width of the first region of the membrane in the second membrane region is less than or equal to the average width of the first region of the membrane in the third membrane region.
2. The cell of claim 1, wherein a maximum value of the width of the first region of the first membrane regions is less than or equal to a minimum value of the width of the first region of the membranes in the third membrane regions; and/or
The maximum value of the width of the first region of the membrane in the second membrane region is less than or equal to the minimum value of the width of the first region of the membrane in the third membrane region.
3. The cell of claim 1, wherein the cell comprises a plurality of conductive traces,
the width of the first area of the diaphragm in the first diaphragm area is 1/10-1/2 of the width of the first area of the diaphragm in the third diaphragm area; and/or
The width of the first area of the diaphragm in the second diaphragm area is 1/10-1/2 of the width of the first area of the diaphragm in the third diaphragm area.
4. The cell of claim 1, wherein the cell comprises a plurality of conductive traces,
a width of a first region of the membrane in the first membrane region increases in a first direction away from the third membrane region to near the third membrane region; and/or
The width of the first region of the membrane in the second membrane region increases in a second direction away from the third membrane region to near the third membrane region.
5. The cell of claim 1, wherein the absolute value of the difference between the widths of the first regions of two adjacent membranes is between 0.010mm and 1 mm.
6. The cell of claim 1, wherein the cell comprises a plurality of conductive traces,
in a third direction from the first membrane region to the second membrane region, the width of the first region of the membrane in the third membrane region is increased and decreased.
7. The cell of claim 1, wherein the cell comprises a plurality of conductive traces,
the length of the diaphragm in the first diaphragm area is 1-1.5 times of the length of the diaphragm in the third diaphragm area; and/or
The length of the diaphragm in the second diaphragm area is equal to 1-1.5 times of the length of the diaphragm in the third diaphragm area.
8. The cell of claim 7, wherein the cell comprises a plurality of conductive traces,
the length of the membrane in the first membrane region decreases in a first direction from the third membrane region to near the third membrane region; and/or
In a second direction away from the third diaphragm region to near the third diaphragm region, the length of the diaphragm in the second diaphragm region decreases.
9. The cell of claim 8, wherein the length of the separator in the third separator region decreases and then increases in a third direction from the first separator region to the second separator region.
10. The cell of claim 1, wherein the cell comprises a plurality of conductive traces,
the distance between the boundary of the diaphragm in the first diaphragm area and the boundary of the adjacent first pole piece is 1/5-1/2 of the distance between the boundary of the diaphragm in the third diaphragm area and the boundary of the adjacent first pole piece; and/or
The distance between the boundary of the diaphragm in the second diaphragm area and the boundary of the adjacent first pole piece is 1/5-1/2 of the distance between the boundary of the diaphragm in the third diaphragm area and the boundary of the adjacent first pole piece.
11. The cell of claim 10, wherein the cell comprises a plurality of conductive traces,
decreasing the spacing between the boundary of the diaphragm in the first diaphragm region and the boundary of the adjacent first pole piece in a first direction from the third diaphragm region to the third diaphragm region; and/or
The distance between the boundary of the diaphragm in the second diaphragm area and the boundary of the adjacent first pole piece is decreased in a second direction from the third diaphragm area to the second direction close to the third diaphragm area.
12. The cell of claim 1, wherein one end of at least two of the diaphragms is gathered on one side of the cell;
one end of at least two of the diaphragms is bonded.
13. The cell of claim 12, wherein the cell comprises a plurality of conductive traces,
one end of all the diaphragms is gathered at the middle part of one side of the battery cell.
14. The cell of claim 1, wherein the separator substrate of the body region has a refractive index of 1.49-1.60, and/or
The first region has a membrane substrate refractive index of less than or equal to 1.40.
15. The cell of claim 1, wherein the first region has a hardness greater than the hardness of the body region.
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