CN218182287U - Battery core and battery - Google Patents
Battery core and battery Download PDFInfo
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- CN218182287U CN218182287U CN202222295636.6U CN202222295636U CN218182287U CN 218182287 U CN218182287 U CN 218182287U CN 202222295636 U CN202222295636 U CN 202222295636U CN 218182287 U CN218182287 U CN 218182287U
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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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- 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 utility model relates to a battery technology field, concretely relates to electric core and battery including this electric core. The battery cell comprises a first pole piece arranged on one side of the diaphragm, and a second pole piece and a third pole piece arranged on the other side of the diaphragm; the second pole piece and the third pole piece are arranged in the same plane at intervals and are parallel along the length direction; the first pole piece is provided with the first utmost point ear that outwards stretches out on one side long edge, the second pole piece be provided with the second utmost point ear that outwards stretches out on one side long edge with the third pole piece is provided with the third utmost point ear that outwards stretches out on one side long edge. The battery obtained from the battery core has higher overcharge safety, higher cycle stability and higher first effect.
Description
Technical Field
The utility model relates to a battery technology field, concretely relates to electric core and battery including this electric core.
Background
The lithium ion battery has the advantages of high voltage, high energy density, long cycle life, low self-discharge rate, light weight and the like, and is widely applied to various fields. With the demand of electric equipment on the capacity of the lithium ion battery becoming higher and higher, people expect the improvement of the energy density of the lithium ion battery becoming higher and higher. In order to design and manufacture a lithium ion battery with higher energy density, the cycle performance of the lithium ion battery must be improved while the positive and negative electrode materials with higher gram capacity are used.
The theoretical capacity of the traditional graphite cathode material is 370mAh/g, and the requirement of high energy density cannot be met. The silicon-based negative electrode material as a new generation of negative electrode material of a lithium ion battery has the capacity of up to 4200mAh/g (elemental silicon), and the lithium intercalation capacity is about ten times of that of graphite, which is one of the most widely researched materials at present. However, in practical application, the silicon-based negative electrode material has the problems of low first efficiency, volume expansion, material peeling, pulverization, safety and the like, and the practical application of the silicon-based negative electrode material is limited.
Therefore, it is very important to invent a battery having higher first efficiency, cycle stability and safety.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned problem that prior art exists, provide an electricity core and including the battery of this electricity core. The electric core of the utility model has a structure capable of sharing joule heat during charging, so that the electric core has higher overcharge safety performance; the utility model discloses a battery of electric core gained has higher first effect, higher cycling stability and higher security.
In order to achieve the above object, a first aspect of the present invention provides an electrical core, which includes a first pole piece disposed on one side of a diaphragm, and a second pole piece and a third pole piece disposed on the other side of the diaphragm; the second pole piece and the third pole piece are arranged in the same plane at intervals and are parallel along the length direction; the first pole piece is provided with the first utmost point ear that outwards stretches out on one side long edge, the second pole piece be provided with the second utmost point ear that outwards stretches out on one side long edge with the third pole piece is provided with the third utmost point ear that outwards stretches out on one side long edge.
In one example, the first pole piece is a negative pole piece, the first pole lug is a negative pole lug, the second pole piece is a positive pole piece, the second pole lug is a positive pole lug, the third pole piece is a positive pole piece, and the third pole lug is a positive pole lug.
In one example, the spaced distance between the second and third pole pieces is 0.1-3mm.
In one example, the width of the second pole piece is the same as the width of the third pole piece.
In one example, the sum of the widths of the second pole piece, the third pole piece and the space is not greater than the width of the first pole piece.
In one example, the length of the second pole piece is the same as the length of the third pole piece, and is not greater than the length of the first pole piece.
In one example, the cell is a winding structure, and is composed of a plurality of continuous cell segments, and each circle is composed of 2 cell segments; each battery cell segment comprises 1 first lug, 1 second lug and 1 third lug, two lugs on the same side of the battery cell segment are respectively arranged on trisection points of the length of the battery cell segment, and the lug on the other side of the battery cell segment corresponds to one of the two lugs on the opposite side.
In one example, the first pole piece includes a first current collector and a coating applied to one or both surfaces of the first current collector.
In one example, the second and third pole pieces each independently include a second current collector and a coating layer disposed on one or both surfaces of the second current collector.
The utility model discloses the second aspect provides a battery, the electric core of battery does the utility model discloses the first aspect electric core.
Through the technical scheme, the utility model discloses compare with prior art and have following advantage at least:
(1) The battery of the utility model has high safety performance;
(2) The battery of the utility model has high first circulation efficiency;
(3) The utility model discloses a battery cycling stability is high.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
Fig. 1 is a schematic view of an expanded structure of a cell structure before winding according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram illustrating a circle of the battery cell according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a structure of a negative electrode in an electrical core according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating a structure of a positive electrode in an electrical core according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an expanded structure of the cell structure of comparative example 1 of the present invention before winding.
Description of the reference numerals
1001. Cell segments; 11. a first pole piece; 12. a second pole piece; 13. a third pole piece; 101. a negative electrode; 102. a positive electrode; 21. a first tab; 22. a second tab; 23. a third tab; 201. a negative tab; 202. a positive tab; 31. a first current collector; 32. a second current collector; 41. a first coating layer; 42. a second coating layer; 43. a third coating layer; 44. a fourth coating layer; a. the interval between the second pole piece and the third pole piece; b. a length direction; c. a width direction; d. a trisection point on the cell segment; e. and another trisection point on the cell segment.
Detailed Description
The following describes the embodiments of the present invention in detail. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
In the prior art, the battery cell structure is formed by winding a positive plate, a negative plate and a diaphragm, and when overcharged, larger joule heat can be generated, so that the battery cell is easy to catch fire, and the safety performance of the battery is reduced.
In view of the above problems, the present inventors have found that overcharge safety of a battery can be improved by reducing joule heat at the time of overcharge.
The utility model discloses an inventor discovers through further intensive research after, in order to reduce the joule heat when overcharging, can make it share the joule heat that the battery produced when overcharging through the structure that sets up three pole piece in electric core to promote the overcharge security of battery.
The utility model relates to an electric core is shown in fig. 1-4.
As shown in fig. 1, the battery cell includes a first pole piece 11 disposed on one side of the diaphragm, and a second pole piece 12 and a third pole piece 13 disposed on the other side of the diaphragm.
The second pole piece 12 and the third pole piece 13 are spaced in the same plane and are parallel along the length direction b.
According to the principle of the separator-separated electrodes in the battery, it is understood that the second pole piece 12 has the same polarity as the third pole piece 13, and the first pole piece 11 has the opposite polarity to the two pole pieces.
Since the pole piece and the tab are connected, the polarity of the pole piece and the tab is the same, that is, the polarity of the second pole piece 12, the second pole piece 22, the third pole piece 13 and the third pole piece 23 is the same, and the polarity of the first pole piece and the first tab is the same.
According to a specific embodiment, the first tab 11 is a negative tab, the first tab 21 is a negative tab, the second tab 12 is a positive tab, the second tab 22 is a positive tab, the third tab 13 is a positive tab, and the third tab 23 is a positive tab.
As shown in fig. 1, the second pole piece 12 and the third pole piece 13 are in the same plane, the second pole piece 12 and the third pole piece 13 are placed in parallel along the length direction b, and a gap a exists between the second pole piece 12 and the third pole piece 13 in the width direction c.
The first pole piece 11, the second pole piece 12 and the third pole piece 13 are respectively provided with a first tab 21, a second tab 22 and a third tab 23 which extend outwards on a long side of one side.
The first pole piece 11 is provided with a first tab 21 extending outward on a long side (any one of the long sides on both sides), the second pole piece 12 is provided with a second tab 22 extending outward on a long side (the long side close to the outside of the battery cell), and the third pole piece 13 is provided with a third tab 23 extending outward on a long side (the long side close to the outside of the battery cell).
Any one of the second tab 22 and the third tab 23 is located on the same side as the first tab 21, and the other is located on the other side.
The second and third ears 22, 23 are of the same polarity and may be identical (when equal in length and width). Therefore, the structure of the second tab 22 and the first tab 21 on the same side may be the same as the structure of the third tab 23 and the first tab 21 on the same side, and the two structures will not be discussed separately.
As shown in fig. 1, the first tab 21 and the second tab 23 are located on the same side, the second tab 22 is located on the other side, and the first tab 21 and the second tab 22 may also be located on the same side, and the third tab 23 is located on the other side.
The second pole piece 12 with interval between the third pole piece 13 is placed, that is to say, the utility model discloses divide into 2 with the pole piece of diaphragm one side, rather than being the whole piece pole piece like prior art diaphragm both sides.
In one example, the distance of the gap a between the second and third pole pieces 12, 13 is 0.1-3mm (e.g., 0.1, 0.5, 1, 1.5, 2, 2.5, 3 mm).
In a preferred example, the spacing a between the second pole piece 12 and the third pole piece 13 is 0.5-1.5mm.
According to a specific embodiment, the width of the second pole piece 12 is the same as the width of the third pole piece 13.
The utility model discloses in second pole piece 12 third pole piece 13 with the whole area that interval a constitutes has replaced the area of the former integral piece pole piece in the prior art, consequently the utility model discloses in whole area can have with the size requirement that the area of the former integral piece pole piece is imitative in the prior art.
In one example, the sum of the widths of the second pole piece 12, the third pole piece 13 and the interval a is not greater than the width of the first pole piece 11.
In one example, the length of the second pole piece 12 is the same as the length of the third pole piece 13, and is not greater than the length of the first pole piece 11
According to a specific embodiment, the length of the second pole piece 12 is the same as the length of the third pole piece 13, and the length of the first pole piece 11 is 1.2-1.8mm longer than the length of the second pole piece 12 (e.g., 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8 mm).
In one example, the cell is a wound structure, consisting of several consecutive cell segments 1001, and each turn consists of 2 of the cell segments 1001. Fig. 2 is an expanded schematic diagram of a certain circle in a battery cell, and it can be seen that the certain circle in the battery cell is composed of 2 battery cell segments 1001. Since the lengths of the turns in the winding structure of the cell are not exactly the same, the lengths of the cell segments 1001 may be different (each adjusted according to the length of the turn) in order to make the lengths of the cell segments 1001 satisfy the above relationship.
In an example, as shown in fig. 2, each cell segment 1001 includes 1 first tab 21, 1 second tab 22, and 1 third tab 23, two tabs (the first tab 21, and the second tab 22 or the third tab 23) located on the same side of the cell segment 1001 are respectively disposed on one trisection point d and the other trisection point e on the length of the cell segment 1001, and a tab (the third tab 23 or the second tab 22) located on the other side of the cell segment 1001 corresponds to a position of one of the two opposing tabs.
In an example, as shown in fig. 2, the first tab 21 may be located at one trisection point e on the length of the cell segment 1001, the third tab 23 may be located at another trisection point d on the length of the cell segment 1001, the second tab 22 may correspond to the position of the first tab 21, and the second tab 22 may also correspond to the position of the third tab 23.
In one example, the first electrode sheet 11 includes a first current collector 31 and a coating applied to one or both surfaces of the first current collector 31.
In one example, the first electrode tab 11 is a negative electrode tab, which is a conventional negative electrode tab in the art and can be obtained in a commercially available manner.
According to a specific embodiment, as shown in fig. 3, the first pole piece 11 includes a first current collector 31, and a first coating 41, a second coating 42 and a third coating 43 sequentially disposed from inside to outside on one side or both sides of the first current collector 31.
In one example, the surface of the current collector 31 is partially or completely coated by the first coating 41.
According to a particular embodiment, the first coating 41 does not comprise silica.
In one example, the first coating 41 includes graphite, a conductive agent, a binder, and a dispersant.
In one example, the graphite is present in an amount of 95 to 99% by weight, the conductive agent is present in an amount of 0.2 to 1% by weight, the binder is present in an amount of 0.05 to 2% by weight, and the dispersant is present in an amount of 0.3 to 2% by weight, based on the total weight of the first coating 41.
According to a specific embodiment, the second coating 42 comprises silica.
In one example, the second coating 42 further includes graphite, silica, a conductive agent, a binder, and a dispersant.
In one example, the silica is present in an amount of 1-10 wt%, the graphite is present in an amount of 85-98 wt%, the conductive agent is present in an amount of 0.05-2 wt%, the binder is present in an amount of 0.5-2 wt%, and the dispersant is present in an amount of 0.3-2 wt%, based on the total weight of the second coating 42.
In a preferred embodiment, the silica is present in an amount of 4 to 6% by weight, based on the total weight of the second coating 42.
According to a particular embodiment, said third coating 43 comprises metallic lithium.
In one example, the lithium metal has an areal density of 0.1 to 0.3mg/cm, based on the total weight of the third coating 43 2 。
In one example, the second and third electrode sheets 12 and 13 each independently include a second current collector 32 and a coating layer disposed on one or both surfaces of the second current collector 32.
In one example, the second and third pole pieces 12 and 13 are both positive pole pieces, which are conventional in the art and are commercially available.
According to a specific embodiment, as shown in fig. 5, the second and third electrodes 12 and 13 each independently include a second current collector 32 and a fourth coating 44 disposed on one or both surfaces of the second current collector 32.
In one example, the surface of the second current collector 32 is partially or completely covered by the fourth coating 44.
According to a specific embodiment, the fourth coating 44 comprises a ternary material, which is a material consisting of nickel cobalt manganese or a material consisting of nickel cobalt aluminum.
In one example, the weight of the ternary material is 0-50% (e.g., 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%) based on the total weight of the fourth coating 44.
In a preferred embodiment, the ternary material is present in an amount of 5 to 30 weight percent, based on the total weight of the fourth coating 44.
In one example, the ternary material may not be included in the fourth coating layer 44.
The utility model discloses the second aspect provides a battery, this battery includes the first aspect electric core.
The structure of the battery except the battery core can be carried out according to the mode in the field, and the effects of improving the overcharge safety of the battery, improving the first effect of the battery and improving the cycling stability of the battery can be realized.
The battery is owing to contain electric core, can improve the battery overcharge security, improve the battery and imitate and promote battery cycling stability first.
The present invention will be described in detail below. The embodiments described herein are only some embodiments, not all embodiments, of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
Preparation example
(1) Preparation of negative plate
Adding graphite, silica, a conductive agent (carbon black), a binder (polyvinylidene fluoride) and a dispersant (polyvinylpyrrolidone) into a stirring tank according to a mass ratio of (0.5); the slurry of the first coating layer 41 was coated on both sides of the copper foil of the first current collector 31 using a coater, and the second coating layer 42 was also disposed according to the method of the first coating layer 41 except that the second coating layer 42 did not contain silica and the internal ratio of other materials was kept constant, and the second coating layer 42 was coated on the upper layer of the first coating layer 41. Drying the prepared negative plate at the temperature of 100 ℃, rolling, cutting into strips, cleaning out the electrode lug grooves by laser, pre-lithiating the negative plate, forming a third coating 43 on the upper layer of the second coating, wherein the surface density of the metal lithium in the third coating 43 is 0.21mg/cm 2 And welding the nickel tab to obtain the negative plate.
(2) Preparation of Positive plate
Adding lithium cobaltate, a ternary material (cobalt nickel manganese), a conductive agent (carbon black) and polyvinylidene fluoride into a stirring tank according to the ratio of 78.
The following examples are provided to illustrate the cell of the present invention.
Example 1
As shown in fig. 1 and 2, the negative electrode sheet prepared in the preparation example is placed on one side of the separator as the first electrode sheet 11, the positive electrode sheet prepared in the preparation example is placed on the other side of the separator as the second electrode sheet 12 and the third electrode sheet 13, the second electrode sheet 12 and the third electrode sheet 13 are placed at an interval in the same plane and are parallel to each other along the length direction b, the interval a between the second electrode sheet 12 and the third electrode sheet 13 is located in the width direction c, the length of the second electrode sheet 12 and the length of the third electrode sheet 13 are the same, the width of the first electrode sheet 11 is 1.5mm wider than the sum of the widths of the second electrode sheet 12, the third electrode sheet 13 and the interval a, the length of the first electrode sheet 11 is 1.5mm longer than the length of the second electrode sheet 12, the first tab 21 extending outward is provided on one side of the first electrode sheet 11, the second tab 22 extending outward is provided on one side of the second electrode sheet 12, the third tab 23 extending outward is provided on one side of the third electrode sheet 13, the third tab 21 and the third electrode sheet is located on one side of the first electrode sheet 12, and the third electrode sheet is located on the same circle, and the first electrode sheet 21 and the third electrode sheet is located on the same circle, and the third electrode sheet 12 and the third electrode sheet is located on the same circle (the third electrode sheet) at the same circle, and the same position of the same as the third electrode sheet 21 and the third electrode sheet 12. And then packaging with an aluminum-plastic film, baking to remove moisture, injecting an electrolyte, and forming by adopting a hot pressing formation process to obtain the soft package battery cell with the thickness of 38 micrometers, the width of 62mm and the length of 83 mm.
Example 2
A cell was prepared according to the method of example 1, except that the first tab 21 was located at the bisector point of the length of the cell segment.
Example 3
A cell was prepared according to the method of example 1, except that the tabs were distributed more sparsely in the cell such that each turn was a segment of the cell (length was 2 times the length of one segment of the cell in example 1), the first tab 21 and the third tab 23 were respectively located at the trisection point of the length of the segment, and the second tab 22 was located at the other side of the turn of the cell and corresponded to the first tab 21 (3 tabs on each turn of the cell).
Comparative example 1
Referring to the method of example 1, a battery cell is prepared, as shown in fig. 5, except that the negative electrode tab 101 is located on one side of the separator, the entire positive electrode tab 102 is located on the other side of the separator, the length of the negative electrode tab 101 is 1.5mm longer than that of the positive electrode tab 102, the width of the negative electrode tab 101 is 1.5mm wider than that of the positive electrode tab 102, the negative electrode tab 201 extending outward is disposed on the long side of one side of the negative electrode tab 101, the positive electrode tab 202 extending outward is disposed on the long side of one side of the positive electrode tab 102, and the negative electrode tab 201 and the positive electrode tab 202 are located on the same side.
Test example
The following tests were carried out for the batteries obtained in the examples and comparative examples, respectively:
(1) Testing energy density of a battery
Cell energy density = discharge capacity average voltage/(cell thickness cell width cell height)
(2) Test of 25 ℃ Cyclic Capacity Retention
The batteries obtained in the examples and comparative examples were subjected to charge-discharge cycles at 25 ℃ in a charge-discharge cutoff range at a rate of 1.2C/0.7C for 500 weeks, and the discharge capacity at 1 week of the test was designated as x 1 mAh, discharge capacity at week N, recorded as y 1 mAh; dividing the capacity at the Nth week by the capacity at the 1 st week to obtain the circulation capacity retention rate R1= y at the Nth week 1 /x 1 。
(3) Test of circulating Capacity Retention at 45 deg.C
The batteries obtained in the examples and comparative examples were measured at a rate of 0.7C/0.5C at 45 DEG CThe charge-discharge cycle was carried out for 400 weeks in the charge-discharge cut-off voltage range, and the discharge capacity at 1 st week was recorded as x 2 mAh, discharge capacity at week N, recorded as y 2 mAh; dividing the Nth week capacity by the 1 st week capacity to obtain the Nth week cycle capacity retention ratio R 2 ＝y 2 /x 2 。
(4) Testing first cycle efficiency
After the batteries obtained in examples and comparative examples were manufactured, the first charge capacity was measured and recorded as x 3 mAh, first discharge capacity, denoted y 3 mAh, first discharge capacity divided by first charge capacity to obtain first cycle efficiency R 3 ＝y 3 /x 3 。
(5) Testing overcharge performance
Discharging at 0.2 ℃ to lower limit voltage under the environment of 25 +/-5 ℃, standing for 10min, charging at 1C with constant current to 5V/10V, charging at 5V/10V with constant voltage for 7H, testing voltage and internal resistance after overcharging is finished, photographing a picture after testing, and monitoring the surface temperature of the battery; a fire at 150 ℃ indicates "no passage", a fire at 150 ℃ indicates "passage".
The results are shown in Table 1.
TABLE 1
It can be seen through table 1 that can see through comparative example and embodiment, the battery security performance that the electric core of embodiment made obviously improves, and first effect and cycling stability also improve to some extent, explain the utility model discloses an electric core structure can share the joule heat when charging to improve the overcharge security performance of battery.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. In the technical idea scope of the present invention, it can be right to the technical solution of the present invention perform multiple simple modifications, including each technical feature combined in any other suitable manner, these simple modifications and combinations should be regarded as the disclosed content of the present invention, and all belong to the protection scope of the present invention.
Claims (10)
1. The battery cell is characterized by comprising a first pole piece arranged on one side of a diaphragm, and a second pole piece and a third pole piece arranged on the other side of the diaphragm; the second pole piece and the third pole piece are arranged at intervals in the same plane and are parallel along the length direction; the first pole piece is provided with the first utmost point ear that outwards stretches out on one side long edge, the second pole piece be provided with the second utmost point ear that outwards stretches out on one side long edge with the third pole piece is provided with the third utmost point ear that outwards stretches out on one side long edge.
2. The electrical core of claim 1, wherein the first pole piece is a negative pole piece, the first tab is a negative pole tab, the second pole piece is a positive pole piece, the second tab is a positive pole tab, the third pole piece is a positive pole piece, and the third tab is a positive pole tab.
3. The cell of claim 1 or 2, wherein the spaced distance between the second and third pole pieces is 0.1-3mm.
4. The electrical core of claim 1 or 2, wherein the width of the second pole piece is the same as the width of the third pole piece.
5. The cell of claim 1 or 2, wherein a sum of widths of the second pole piece, the third pole piece, and the space is no greater than a width of the first pole piece.
6. The electrical core of claim 1 or 2, wherein the length of the second pole piece is the same as the length of the third pole piece, and is not greater than the length of the first pole piece.
7. The cell of claim 1 or 2, wherein the cell is a wound structure, and is composed of a plurality of consecutive cell segments, and each turn is composed of 2 cell segments; each battery cell segment comprises 1 first lug, 1 second lug and 1 third lug, two lugs on the same side of the battery cell segment are respectively arranged on trisection points of the length of the battery cell segment, and the lug on the other side of the battery cell segment corresponds to one of the two lugs on the opposite side.
8. The cell of claim 1, wherein the first pole piece comprises a first current collector and a coating applied to one or both surfaces of the first current collector.
9. The cell of claim 1, wherein the second and third pole pieces each independently comprise a second current collector and a coating disposed on one or both surfaces of the second current collector.
10. A battery comprising a cell according to any of claims 1 to 9.
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| CN202222295636.6U CN218182287U (en) | 2022-08-29 | 2022-08-29 | Battery core and battery |
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| CN202222295636.6U CN218182287U (en) | 2022-08-29 | 2022-08-29 | Battery core and battery |
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