CN213520088U - Battery cell, battery and electronic product - Google Patents
Battery cell, battery and electronic product Download PDFInfo
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- CN213520088U CN213520088U CN202023061500.6U CN202023061500U CN213520088U CN 213520088 U CN213520088 U CN 213520088U CN 202023061500 U CN202023061500 U CN 202023061500U CN 213520088 U CN213520088 U CN 213520088U
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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 embodiment of the utility model provides an electric core, battery and electronic product, this electric core includes the lamination stack that is formed by stacking a plurality of pole pieces, and lamination stack includes at least one positive plate, at least one negative pole piece and diaphragm, and the diaphragm is located between positive plate and the negative pole piece; the lamination structure is coiled in a zigzag manner, the lamination structure is coiled from the head to the tail to form a plurality of horizontal sections stacked up and down and a plurality of connecting sections, every two adjacent horizontal sections are connected through one connecting section, and the two adjacent connecting sections are respectively positioned at two ends of the horizontal sections. The utility model also provides a battery, including shell and above-mentioned electric core. The utility model also provides an electronic product, including above-mentioned battery. The utility model provides an electricity core has reduced the process that the pole piece stacked at the in-process of production to can improve the production efficiency of electricity core.
Description
Technical Field
The embodiment of the utility model provides a lithium ion battery technique especially relates to an electricity core, battery and electronic product.
Background
With the development of science and technology, more and more electronic products enter people's lives, and a large part of electronic products are driven by batteries. Among them, lithium ion batteries are widely used in electronic products in various fields because of their advantages such as long service life and high energy density.
At present, an electric core is arranged inside a lithium ion battery, the electric core comprises a plurality of positive plates and a plurality of negative plates, the positive plates and the negative plates are stacked in a staggered mode, and the negative plates are located between the two positive plates. The battery cell is also provided with a diaphragm, and the diaphragm is positioned between the negative plate and the positive plate and used for preventing the positive plate and the negative plate from being in contact short circuit.
However, in the production process of the battery cell, a plurality of positive plates and a plurality of negative plates need to be stacked in sequence, and the production efficiency of the battery cell is low.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an electricity core, battery and electronic product to solve current electric core at the in-process of production, need stack a plurality of positive plates and a plurality of negative pole pieces in proper order, the slower problem of production efficiency of electric core.
According to an aspect of an embodiment of the present invention, there is provided an electrical core, including a laminated structure formed by stacking a plurality of pole pieces, where the laminated structure includes at least one positive pole piece, at least one negative pole piece, and a diaphragm, and the diaphragm is located between the positive pole piece and the negative pole piece;
the lamination structure is coiled in a zigzag manner, the lamination structure is coiled from the head to the tail to form a plurality of horizontal sections stacked up and down and a plurality of connecting sections, every two adjacent horizontal sections are connected through one connecting section, and the two adjacent connecting sections are respectively positioned at two ends of the horizontal sections.
In an optional implementation manner, the pole pieces include a first positive pole piece, a second positive pole piece, and a negative pole piece, and the negative pole piece is located between the first positive pole piece and the second positive pole piece;
the negative plate comprises a negative current collector and a negative coating, wherein the first surface and the second surface of the negative current collector are respectively coated with the negative coating, and the first surface and the second surface of the negative current collector are aligned end to end; the negative coating on the first surface of the negative current collector faces the first positive coating of the first positive plate, and the negative coating on the second surface of the negative current collector faces the second positive coating of the second positive plate. The technical personnel in the field can understand that through the above arrangement, the negative plate has no single-surface area, and in the charging process of the battery core, the current densities of the negative coatings on the two sides of the negative current collector at the same position are the same, so that compared with the prior art, lithium precipitation of the negative plate is difficult to occur, and the quick charging performance of the battery is improved.
In an optional implementation manner, the surface of the first positive plate is coated with the first positive coating on one side, and the surface of the second positive plate is coated with the second positive coating on one side. It can be understood by those skilled in the art that the above arrangement contributes to an increase in the energy density of the battery.
In an alternative implementation manner, the first positive electrode sheet comprises a first surface and a second surface which are oppositely arranged, the first positive electrode coating is coated on the first surface of the first positive electrode sheet only, and the first surface of the first positive electrode sheet faces the negative electrode sheet;
the second positive plate comprises a first surface and a second surface which are oppositely arranged, the second positive coating is only coated on the first surface of the second positive plate, and the first surface of the second positive plate faces the negative plate.
In an optional implementation manner, the first positive plate is further provided with a first positive tab, and the first positive tab is arranged in a tab connection area of the first positive plate;
the second positive plate is also provided with a second positive lug, and the second positive lug is arranged in a lug connection area of the second positive plate;
the first positive lug is electrically connected with the second positive lug; the first positive lug and the second positive lug are arranged in an overlapping mode and are connected with each other in a welding mode. As will be understood by those skilled in the art, the first positive tab is a metal conductor led out from the first positive plate, the second positive tab is a metal conductor led out from the second positive plate, and the negative tab is a metal conductor led out from the negative plate, that is, the first positive tab, the second positive tab and the negative tab are contact points when the battery cell is charged and discharged. The first positive tab and the second positive tab are overlapped and welded, so that the internal resistance of the winding core can be reduced.
In an optional implementation manner, the first positive tab is disposed at the first fold of the first positive tab, the second positive tab is disposed at the first fold of the second positive tab, and the negative tab of the negative tab is disposed at the first fold of the negative tab; the battery cell comprises a vertical central line, the negative pole lug is arranged on one side of the vertical central line, and the first positive pole lug and the second positive pole lug are arranged on the other side of the vertical central line. As can be appreciated by those skilled in the art, the contact short circuit between the negative electrode tab and the first positive electrode tab or the second positive electrode tab can be effectively prevented by the arrangement.
In an optional implementation manner, the head of the separator exceeds the head of the first positive electrode coating, the head of the second positive electrode coating and the head of the negative electrode coating, and the tail of the separator exceeds the tail of the first positive electrode coating, the tail of the second positive electrode coating and the tail of the negative electrode coating. Through the arrangement, the diaphragm completely separates the first positive plate from the negative plate, and the second positive plate from the negative plate, so that the short circuit of the battery cell can not occur in the charging and discharging process.
In an alternative implementation, the head of the negative electrode coating exceeds the head of the first positive electrode coating and the head of the second positive electrode coating; the tail of the negative electrode coating exceeds the tail of the first positive electrode coating and the tail of the second positive electrode coating. As can be understood by those skilled in the art, through the above arrangement, the negative electrode coating completely covers the positive electrode coating, and lithium ions coming out of the positive electrode coating can be inserted into the negative electrode coating during the charging process of the battery cell, so that the phenomenon of lithium precipitation of the negative electrode sheet is avoided.
According to another aspect of the embodiments of the present invention, there is provided a battery, including a housing and the battery cell as described above.
According to another aspect of the embodiments of the present invention, there is provided an electronic product including the battery as described above.
It can be understood by those skilled in the art that the present invention provides an electric core including a laminated structure formed by stacking a plurality of pole pieces, the laminated structure is zigzag coiled, the laminated structure is coiled from the head portion to the tail portion to form a plurality of horizontal sections stacked up and down and a plurality of connecting sections, and each two adjacent horizontal sections are connected and adjacent two connecting sections are respectively located at two ends of the horizontal section. Like this, electric core only need pile up the pole piece at the in-process of production, then coil the lamination that the pole piece was piled up, make lamination be the zigzag can, compare in prior art, can reduce the process that the pole piece piles up, and then can improve the production efficiency of electric core.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a battery cell provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first positive plate provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a negative electrode sheet according to an embodiment of the present invention.
Description of reference numerals:
100-electric core;
110-a first positive plate;
111-a first positive current collector;
112-a first positive coating;
113-a first positive tab;
120-a second positive plate;
121-a second positive current collector;
122-a second positive coating;
123-a second positive tab;
130-negative plate;
131-a negative current collector;
132-a negative electrode coating;
133-negative tab;
140-a horizontal segment;
150-a separator;
160-connecting segment.
Detailed Description
First of all, it should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be modified as needed by those skilled in the art to suit particular applications.
Next, it should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that a device or member must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
At present, an electric core is arranged inside a lithium ion battery, the electric core comprises a plurality of positive plates and a plurality of negative plates, the positive plates and the negative plates are stacked in a staggered mode, and the negative plates are located between the two positive plates. The battery cell is also provided with a diaphragm, and the diaphragm is positioned between the negative plate and the positive plate and used for preventing the positive plate and the negative plate from being in contact short circuit. However, in the production process of the battery cell, a plurality of positive plates and a plurality of negative plates need to be stacked in sequence, and the production efficiency of the battery cell is low.
After repeated thinking and verification, the inventor found that if the pole pieces of the battery cell are first stacked into a laminated structure, and then the laminated structure is coiled to form the laminated structure into a specific shape, for example, the laminated structure is coiled into a zigzag shape. Therefore, the process of pole piece stacking can be reduced, and the production efficiency of the battery cell can be improved in the production process of the battery cell.
In view of this, the inventor designs a battery cell, which is a laminated structure formed by stacking a plurality of pole pieces, the laminated structure is wound in a zigzag manner, the laminated structure is wound from the head portion to the tail portion to form a plurality of horizontal sections stacked up and down and a plurality of connecting sections, every two adjacent horizontal sections are connected through one connecting section, and two adjacent connecting sections are respectively located at two ends of the horizontal section. Therefore, the procedure of stacking the pole pieces can be reduced in the production process of the battery cell, and the production efficiency of the battery cell is improved.
Example one
Fig. 1 is a schematic structural diagram of a battery cell provided in this embodiment; fig. 2 is a schematic structural diagram of a first positive electrode tab provided in this embodiment; fig. 3 is a schematic structural diagram of the negative electrode sheet provided in this embodiment.
Referring to fig. 1, the battery cell 100 provided in the present embodiment includes a laminated structure formed by stacking a plurality of pole pieces, and it is easy to understand that the laminated structure includes at least one positive pole piece, at least one negative pole piece 130, and a separator 150, where the separator 150 is located between the positive pole piece and the negative pole piece 130, and the separator 150 is used for separating the positive pole piece from the negative pole piece 130 so as to avoid a short circuit between the positive pole piece and the negative pole piece 130. Fig. 1 shows that the lamination structure is coiled in a zigzag shape, specifically, the lamination structure is coiled from the head to the tail to form a plurality of horizontal sections 140 stacked up and down and a plurality of connecting sections 160, illustratively, the horizontal sections 140 are linear structures, and the connecting sections 160 are semicircular structures. Every two adjacent horizontal segments 140 are connected by a connecting segment 160, and the two adjacent connecting segments 160 are respectively located at two ends of the horizontal segment 140, for example, the first horizontal segment 140 and the second horizontal segment 140 are connected by the right connecting segment 160 from bottom to top, and the second horizontal segment 140 and the third horizontal segment 140 are connected by the left connecting segment 160.
As can be understood by those skilled in the art, the battery cell 100 is a component for storing and releasing electric energy in the battery, and lithium ions are extracted from the positive plate and embedded into the negative plate 130 during the charging process, and lithium ions are extracted from the negative plate 130 and embedded into the positive plate during the discharging process, so that the charging and discharging of the battery cell 100 are realized by the extraction of lithium ions, and further, the charging and discharging of the lithium ion battery are realized. Set electric core 100 to the lamination structure that piles up by a plurality of pole pieces and form and coil "zigzag" structure, can reduce the pole piece stacking process of electric core 100 in the production process, or, it can be said, among the prior art, the pole piece of electric core 100 is at the in-process that piles up, need stack a plurality of positive plates and a plurality of negative pole pieces 130 one by one and make the position of positive plate and negative pole piece 130 crisscross each other, electric core 100 that this embodiment provided, only need stack a plurality of pole pieces into the lamination structure, then coil the lamination structure can, the pole piece number of piles of lamination structure is still less than current electric core 100, and then can reduce the process that the pole piece stacked, improve electric core 100's production efficiency.
Fig. 1 shows that the cross section of the battery cell 100 is approximately rectangular, which is mainly applied to a lithium ion battery such as a mobile phone battery. The length of the horizontal segments 140 of the battery cells 100 and the specific number of the horizontal segments 140 are not limited in this embodiment, and those skilled in the art can set the lengths and the specific number according to actual needs.
As shown in fig. 1, in one possible implementation, the pole pieces include a first positive pole piece 110, a second positive pole piece 120, and a negative pole piece 130, and the negative pole piece 130 is located between the first positive pole piece 110 and the second positive pole piece 120. Fig. 2 shows that the first positive electrode tab 110 includes a first positive electrode collector 111 and a first positive electrode coating 112, the first positive electrode coating 112 is coated on the surface of the first positive electrode collector 111, and the first positive electrode coating 112 is coated on the surface of the first positive electrode collector 111 along the length direction. As can be understood by those skilled in the art, the first positive electrode coating 112 is used to provide sites for lithium ion intercalation and deintercalation, and specifically, lithium ions are deintercalated from the first positive electrode coating 112 during charging of the battery cell 100; during discharge of the battery cell 100, lithium ions are inserted into the first positive electrode coating 112. The first positive electrode coating layer 112 includes a positive electrode active material, a positive electrode binder, and a positive electrode conductive agent. In this embodiment, specific components of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent are not limited, and those skilled in the art can set the specific components according to actual needs. Illustratively, LiCoO2, LiNiCoMnO2, LiCoAlO2, LiMn2O4, and the like can be used as the positive electrode active material.
It should be noted that the second positive electrode sheet 120 has the same structure as the first positive electrode sheet 110, wherein the positive electrode sheet above the negative electrode sheet 130 after the pole sheets are stacked is the first positive electrode sheet 110, and the positive electrode sheet below the negative electrode sheet 130 is the second positive electrode sheet 120.
Preferably, as shown in fig. 1-2, a first positive electrode coating is coated on a single surface of the first positive electrode tab, and exemplarily, a first surface of the first positive electrode tab 110 is above the first positive electrode collector 111 in fig. 2, a second surface of the first positive electrode tab 110 is below the first positive electrode collector 111, and the first positive electrode coating 112 is coated only on the first surface of the first positive electrode collector 111. The lamination stack is stacked such that the first surface of the first positive electrode tab 110 faces the negative electrode tab 130, and the positive electrode coating of the first positive electrode tab 110 faces the negative electrode coating 132 of the negative electrode tab 130. Accordingly, the surface of the second positive electrode sheet is coated with a second positive electrode coating on one side, and the second positive electrode coating 122 of the second positive electrode sheet 120 faces the negative electrode coating 132 of the negative electrode sheet 130 after the lamination structure is stacked.
As can be understood by those skilled in the art, the first positive electrode sheet 110 and the second positive electrode sheet 120 are coated on one side, and the first surface of the first positive electrode sheet 110 and the first surface of the second positive electrode sheet 120 both face the negative electrode sheet 130, so that the first positive electrode coating 112 of the first positive electrode sheet 110 and the second positive electrode coating 122 of the second positive electrode sheet 120 can face the negative electrode coating 132 of the negative electrode sheet 130. The positive electrode coating which is not opposite to the position of the negative electrode coating 132 is removed through the arrangement, and the energy density of the battery is further improved.
As shown in fig. 2, the first positive electrode tab 110 is provided with a first positive electrode tab 113, the first positive electrode tab 113 is disposed on a tab connection area of the first positive electrode tab 110, exemplarily, on a side of the first positive electrode collector 111 coated with the first positive electrode coating 112, and the first positive electrode tab 113 is electrically connected with the first positive electrode collector 111.
Generally, the material of the first positive tab 113 is the same as the material of the first positive current collector 111, and the first positive tab 113 is fastened to the surface of the first positive current collector 111, so that the first positive tab 113 is electrically connected to the first positive current collector 111. For example, when the first positive electrode collector 111 is an aluminum foil, the material of the first positive electrode tab 113 may also be aluminum. In this embodiment, the connection manner between the first positive tab 113 and the first positive current collector 111 is not limited, and for example, the first positive tab 113 is disposed on the first positive current collector 111 by die cutting or bonding, or those skilled in the art may manufacture the first positive tab and the first positive current collector into an integral piece by an integral molding process.
It is easy to understand that the second positive electrode tab 120 is further provided with a second positive electrode tab 123, the second positive electrode tab 123 is disposed on the tab connection area of the second positive electrode tab 120, and the second positive electrode tab 123 is electrically connected with the second positive electrode current collector 121 of the second positive electrode tab 120.
First positive tab 113 is electrically connected to second positive tab 123. As shown in fig. 1-2, after the pole pieces of the battery cell 100 are stacked, the first positive tab 113 of the first positive tab 110 and the second positive tab 123 of the second positive tab 120 are overlapped, that is, as shown in fig. 1, the first positive tab 113 and the second positive tab 123 are located on the same vertical straight line, and the first positive tab 113 and the second positive tab 123 are welded and connected. As can be understood by those skilled in the art, the first positive tab 113 is electrically connected to the second positive tab 123, and in the charging process of the battery cell 100, the first positive tab 110 is equivalent to be connected in parallel with the second positive tab 120, and the resistance of the first positive tab 110 and the second positive tab 120 after being connected in parallel is smaller than that of a single positive tab, so that the internal resistance of the battery can be reduced.
As shown in fig. 3, the negative electrode tab 130 provided in this embodiment includes a negative electrode collector 131 and a negative electrode coating 132, in fig. 3, an upper surface of the negative electrode collector 131 is a first surface of the negative electrode collector 131, and a lower surface of the negative electrode collector 131 is a second surface of the negative electrode collector 131. The first surface and the second surface of the negative electrode collector 131 are coated with the negative electrode coating 132, that is, the negative electrode coating 132 is coated on both sides of the surface of the negative electrode collector 131. Fig. 1 shows that the negative coating 132 on the first surface of the negative electrode collector 131 faces the first positive coating 112 of the first positive electrode tab 110, and the negative coating 132 on the second surface of the negative electrode collector 131 faces the second positive coating 122 of the second positive electrode tab 120.
It is worth mentioning that the first surface and the second surface of the negative electrode current collector 131 are aligned end to end with the negative electrode coating 132, that is, the negative electrode sheet 130 is not provided with a single-coated region, and those skilled in the art can understand that the current density of the single-coated region of the negative electrode sheet 130 during the charging process of the battery cell is greater than that of the double-coated region of the negative electrode sheet 130, and if the negative electrode sheet 130 is provided with the single-coated region and the double-coated region, the current density of the negative electrode coating 132 of the negative electrode sheet 130 during the charging process of the battery cell 100 may be inconsistent. In this embodiment, the negative electrode sheet 130 is coated on both sides, and the negative electrode sheet 130 is not provided with a single-side coating region, so that the current density of the negative electrode coating 132 is reduced on the premise of ensuring the current density of the negative electrode coating 132 to be consistent in the charging process of the battery cell 100, lithium is not easily separated from the negative electrode sheet 130, and the quick charging performance of the battery is improved.
It is worth mentioning that the separators 150 are disposed between the negative electrode sheet 130 and the first positive electrode sheet 110 and between the negative electrode sheet 130 and the second positive electrode sheet 120, and the separators 150 are disposed between the negative electrode sheet 130 and the first positive electrode sheet 110 and between the negative electrode sheet 130 and the second positive electrode sheet 120 in the stacking process of the electrode sheets into the lamination structure. It is easy to understand that the separator 150 is used to separate the negative electrode sheet 130 from the first positive electrode sheet 110 and the negative electrode sheet 130 from the second positive electrode sheet 120, so as to avoid short circuit between the positive and negative electrode sheets of the battery cell 100.
Further, the head of the negative electrode coating 132 exceeds the head of the first positive electrode coating 112 and the head of the second positive electrode coating 122; the tail of the cathode coating 132 exceeds the tail of the first cathode coating 112 and the tail of the second cathode coating 122. Illustratively, the head of the negative electrode coating 132 exceeds the head of the first positive electrode coating 112 by 1-2mm, and the tail of the negative electrode coating 132 exceeds the tail of the first positive electrode coating 112 by 1-2 mm. As can be understood by those skilled in the art, by the above arrangement, it can be ensured that the negative electrode coating 132 completely covers the first positive electrode coating 112 and the second positive electrode coating 122, and during the charging process of the battery cell 100, lithium ions extracted from the first positive electrode coating 112 and the second positive electrode coating 122 can be completely embedded into the negative electrode coating 132, so as to avoid the phenomenon of lithium precipitation at the tail of the negative electrode piece 130 during the charging process of the battery cell 100.
Fig. 3 shows that the negative electrode tab 130 is provided with the negative electrode tab 133, and the negative electrode tab 133 is provided at a tab connection region of the negative electrode tab 130, the specific location of the tab connection region of the negative electrode tab 130 on the negative electrode tab 130 is not limited in this embodiment, and may be set by a person skilled in the art according to actual needs, for example, the tab connection region of the negative electrode tab 130 is located on a plane of the negative electrode current collector 131 along the length direction, that is, the tab connection region of the negative electrode tab 130 is located on a plane of the negative electrode current collector 131 coated with the negative electrode coating.
In general, the materials of the negative electrode tab 133 and the negative electrode collector 131 may be set according to actual needs. For example, when copper foil is used as the negative electrode collector 131, the material of the negative electrode tab 133 is nickel, and the negative electrode tab 133 and the negative electrode collector 131 are electrically connected to each other. The negative electrode tab 133 and the negative electrode collector 131 may be connected by various methods, for example, by welding.
The specific positions of the positive tab and the negative tab 133 on the battery cell 100 are not limited in the present embodiment, and for example, the first positive tab 113 is disposed on the first fold of the first positive tab 110, the second positive tab 123 is disposed on the first fold of the second positive tab 120, and the negative tab 133 of the negative tab 130 is disposed on the first fold of the negative tab 130. Preferably, the negative tab 133 is located on one side of the vertical center line L1, the first positive tab 113 and the second positive tab 123 are located on the other side of the vertical center line L1, for example, the negative tab 133 is located on the left side of the vertical center line L1, and the first positive tab 113 and the second positive tab 123 are located on the right side of the vertical center line L1. As will be understood by those skilled in the art, disposing negative tab 133 on one side of vertical center line L1 and disposing first positive tab 113 and second positive tab 123 on the other side of vertical center line L1 effectively prevents a short circuit from occurring between negative tab 133 and first positive tab 113 or second positive tab 123.
As shown in fig. 1, the number of the separators 150 is two, and the two separators 150 are respectively located between the first positive electrode tab 110 and the negative electrode tab 130 and between the second positive electrode tab 120 and the negative electrode tab 130. Illustratively, the separator 150 may include a substrate, which may be a Polyethylene (PE) monolayer film, a polypropylene (PP) monolayer film, or a polypropylene-polyethylene-polypropylene three-layer composite film, and a coating layer, which may be at least one of porous silicon dioxide, aluminum oxide, titanium dioxide, and zirconium dioxide.
As can be appreciated by those skilled in the art, the separator 150 can insulate the first positive electrode tab 110 and the negative electrode tab 130, and the second positive electrode tab 120 and the negative electrode tab 130 from each other, and prevent the battery cell 100 from short-circuiting during charging and discharging. The diaphragm 150 is provided with a hole for lithium ions to pass through, so that the lithium ion battery with the battery core 100 can work normally.
Preferably, fig. 1 shows that the head of the separator 150 exceeds the head of the first positive electrode coating 112, the head of the second positive electrode coating 122 and the head of the negative electrode coating 132, and the tail of the separator 150 exceeds the tail of the first positive electrode coating 112, the tail of the second positive electrode coating 122 and the tail of the negative electrode coating 132. As will be understood by those skilled in the art, the above arrangement can ensure that the separator 150 completely separates the first positive electrode tab 110 from the negative electrode tab 130 and the second positive electrode tab 120 from the negative electrode tab 130, so that the battery cell 100 is not short-circuited during charging and discharging.
Example two
On the basis of the first embodiment, the present embodiment further provides a battery, which includes a casing and the battery cell in the first embodiment.
The battery that this embodiment provided is provided with electric core and electrolyte in the inside of shell to positive ear and negative pole ear and external circuit intercommunication through electric core, wherein positive ear includes the positive ear of first positive ear and second, and the positive ear of first positive ear sets up on first anodal piece, and the positive ear of second sets up on the second anodal piece, and the negative pole ear sets up on the negative pole piece. In the charging process of the battery, lithium ions are extracted from the positive coating of the positive plate and are embedded into the negative coating of the negative plate after passing through the diaphragm; in the discharging process of the battery, lithium ions are extracted from the negative electrode coating of the negative electrode plate, pass through the diaphragm and are embedded into the positive electrode coating of the positive electrode plate.
In the battery provided by the embodiment, due to the adoption of the battery core in the first embodiment, in the charging process of the battery, the current densities of the two sides of the negative electrode coating layer, which are positioned at the same position as the negative electrode current collector, are the same, the lithium precipitation of the negative electrode piece is difficult to occur, and the quick charging performance is improved. In addition, a plurality of pole pieces do not need to be stacked in the manufacturing process, and the production efficiency is high.
EXAMPLE III
The embodiment provides an electronic product, which comprises a battery.
The battery in this embodiment has the same structure as the battery provided in the second embodiment, and can bring about the same or similar technical effects, and details are not repeated herein, and reference may be specifically made to the description of the above embodiments.
In the description of the present invention, it is to be understood that the terms "top," "bottom," "upper," "lower" (if present), and the like, are used in the orientation or positional relationship shown in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The terms "first" and "second" in the description and claims of the present application and the description of the above-described figures are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The battery cell is characterized by comprising a laminated structure formed by stacking a plurality of pole pieces, wherein the laminated structure comprises at least one positive pole piece, at least one negative pole piece and a diaphragm, and the diaphragm is positioned between the positive pole piece and the negative pole piece;
the lamination structure is coiled in a zigzag manner, the lamination structure is coiled from the head to the tail to form a plurality of horizontal sections stacked up and down and a plurality of connecting sections, every two adjacent horizontal sections are connected through one connecting section, and the two adjacent connecting sections are respectively positioned at two ends of the horizontal sections.
2. The cell of claim 1, wherein the pole pieces comprise a first positive pole piece, a second positive pole piece, and a negative pole piece, and the negative pole piece is located between the first positive pole piece and the second positive pole piece;
the negative plate comprises a negative current collector and a negative coating, wherein the first surface and the second surface of the negative current collector are respectively coated with the negative coating, and the first surface and the second surface of the negative current collector are aligned end to end; the negative coating on the first surface of the negative current collector faces the first positive coating of the first positive plate, and the negative coating on the second surface of the negative current collector faces the second positive coating of the second positive plate.
3. The battery cell of claim 2, wherein the first positive electrode sheet is coated with the first positive electrode coating on one surface, and the second positive electrode sheet is coated with the second positive electrode coating on one surface.
4. The battery cell of claim 3, wherein the first positive electrode sheet comprises a first surface and a second surface which are oppositely arranged, the first positive electrode coating is coated on the first surface of the first positive electrode sheet, and the first surface of the first positive electrode sheet faces the negative electrode sheet;
the second positive plate comprises a first surface and a second surface which are oppositely arranged, the second positive coating is coated on the first surface of the second positive plate, and the first surface of the second positive plate faces the negative plate.
5. The battery cell of claim 4, wherein the first positive electrode plate is further provided with a first positive electrode tab, and the first positive electrode tab is arranged at a tab connection area of the first positive electrode plate;
the second positive plate is also provided with a second positive lug, and the second positive lug is arranged in a lug connection area of the second positive plate;
the first positive lug is electrically connected with the second positive lug;
the first positive lug and the second positive lug are arranged in an overlapping mode and are connected with each other in a welding mode.
6. The battery cell of claim 5, wherein the first positive tab is disposed at the first fold of the first positive tab, the second positive tab is disposed at the first fold of the second positive tab, and the negative tab of the negative tab is disposed at the first fold of the negative tab; the battery cell comprises a vertical central line, the negative pole lug is arranged on one side of the vertical central line, and the first positive pole lug and the second positive pole lug are arranged on the other side of the vertical central line.
7. The electrical core of any of claims 2 to 6, wherein the head of the separator exceeds the head of the first positive coating, the head of the second positive coating, and the head of the negative coating, and the tail of the separator exceeds the tail of the first positive coating, the tail of the second positive coating, and the tail of the negative coating.
8. The electrical core of any of claims 2 to 6, wherein the head of the negative coating extends beyond the head of the first positive coating and the head of the second positive coating; the tail of the negative electrode coating exceeds the tail of the first positive electrode coating and the tail of the second positive electrode coating.
9. A battery comprising a housing and the cell of any of claims 1-8.
10. An electronic product comprising the battery according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023061500.6U CN213520088U (en) | 2020-12-16 | 2020-12-16 | Battery cell, battery and electronic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023061500.6U CN213520088U (en) | 2020-12-16 | 2020-12-16 | Battery cell, battery and electronic product |
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| Publication Number | Publication Date |
|---|---|
| CN213520088U true CN213520088U (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023061500.6U Active CN213520088U (en) | 2020-12-16 | 2020-12-16 | Battery cell, battery and electronic product |
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| Country | Link |
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| CN (1) | CN213520088U (en) |
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