CN219123266U - Battery cell and battery - Google Patents
Battery cell and battery Download PDFInfo
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- CN219123266U CN219123266U CN202222561453.4U CN202222561453U CN219123266U CN 219123266 U CN219123266 U CN 219123266U CN 202222561453 U CN202222561453 U CN 202222561453U CN 219123266 U CN219123266 U CN 219123266U
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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
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a battery cell and a battery, wherein the battery cell comprises a plurality of first pole pieces and second pole pieces which are alternately stacked, and the polarities of the first pole pieces and the second pole pieces are opposite; the device also comprises a third pole piece, one end of the third pole piece is covered on the outer surface of the first pole piece or the second pole piece at the first outermost side, and the other end of the third pole piece is wound on the outer surface of the first pole piece or the second pole piece at the second outermost side at least; the first outermost side and the second outermost side are oppositely arranged along the thickness direction of the battery cell. The utility model solves the problems that the electrode plates at the uppermost layer and the lowermost layer of the battery core in the existing lithium ion battery structure are only coated with active material layers on one side, so that the stress on the two sides of the electrode plates is different, the curling and wrinkling phenomena of the electrode plates are easy to cause, and the quality of the lithium ion battery is affected.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a battery cell and a battery.
Background
The lithium ion battery has the advantages of higher energy density, longer cycle life, environmental friendliness and the like, and is widely applied to portable electronic products such as mobile phones, notebook computers and the like and new energy automobiles. With the increasing requirements for electronic products and new energy automobiles, the requirements for the energy density and the safety performance of lithium ion batteries are also increasing.
The lithium ion battery mainly comprises laminated type and winding type, and the laminated structure has the advantages of high energy density, flexible shape and size, prominent multiplying power charge and discharge performance, low charge temperature rise and the like, and is increasingly in important position. Currently, laminated lithium ion batteries mainly include: the battery cell is formed by stacking a plurality of positive plates and negative plates which are alternately arranged, the positive plates comprise positive current collectors and positive active material layers arranged on the surfaces of two sides of the positive current collectors, the negative plates comprise negative current collectors and negative active material layers arranged on the surfaces of two sides of the negative current collectors, and the current collectors and the active material layers collect active ions generated by electrochemistry to an external circuit in a physical contact mode, so that the mutual conversion between chemical energy and electric energy is realized.
At present, in order to maximize the energy density of a lithium ion battery, an active material layer is only coated on one side of a pole piece of an uppermost layer and a lowermost layer of the laminated lithium ion battery, however, the active material layer is only coated on one side of the pole piece, so that the stress on one side surface of the pole piece coated with the active material layer is different from that on the other side surface of the pole piece not coated with the active material layer, and the curling and wrinkling phenomena of the pole piece are easily caused, so that the quality of the lithium ion battery is affected.
Disclosure of Invention
The utility model aims to solve the problems that in the existing lithium ion battery structure, the uppermost layer and the lowermost layer of the battery core are coated with active material layers only on one side, so that the stress on two sides of the electrode is different, the curling and wrinkling phenomena of the electrode are easy to cause, and the quality of the lithium ion battery is influenced.
In order to solve the above problems, a first aspect of the present utility model provides an electrical core, including a plurality of first pole pieces and second pole pieces that are alternately stacked, wherein polarities of the first pole pieces and the second pole pieces are opposite;
the device further comprises a third pole piece, one end of the third pole piece is covered on the outer surface of the first pole piece or the second pole piece at the first outermost side, and the other end of the third pole piece at least winds on the outer surface of the first pole piece or the second pole piece at the second outermost side;
the first outermost side and the second outermost side are oppositely arranged along the thickness direction of the battery cell.
Further, the third pole piece comprises a single-sided plaster coating area;
the single-sided paste coating area comprises a third current collector and a third active material layer, and the third active material layer is coated on one side of the third current collector facing the first pole piece or the second pole piece;
the single-sided paste coating area comprises a first flat section and a second flat section which are oppositely arranged, wherein the first flat section at least covers the area of the first outermost side opposite to the first pole piece or the second pole piece, and the second flat section at least covers the area of the second outermost side opposite to the first pole piece or the second pole piece.
Further, the insulation layer is further included, one end of the insulation layer is connected with the first straight section, the other end of the insulation layer is connected with the second straight section, and the insulation layer covers the free ends of the first straight section and the second straight section.
Further, the third pole piece comprises a single-sided paste coating area and an empty foil area;
the single-sided paste coating area comprises a third current collector and a third active material layer, and the third active material layer is coated on one side of the third current collector facing the first pole piece or the second pole piece;
the empty foil region comprises a third current collector, the third current collector being uncoated with the third active material layer;
the single-sided paste coating area comprises a first flat section and a second flat section which are oppositely arranged, the first flat section at least covers the area of the first outermost side opposite to the first pole piece or the second pole piece, and the second flat section at least covers the area of the second outermost side opposite to the first pole piece or the second pole piece;
the first end of the empty foil area is connected with the second straight section, the second end of the empty foil area at least winds to the outer surface of the first straight section, and the empty foil area is arranged opposite to one side of the first straight section, which is not coated with the third active substance layer.
Further, the air foil comprises an insulating layer, one end of the insulating layer is connected with the second end of the air foil region, the other end of the insulating layer is connected with the first straight section, and the insulating layer covers the free end of the second end of the air foil region.
Further, the third pole piece further comprises a curved section between the first straight section and the second straight section, the curved section connects the first straight section and the second straight section, and the third active material layer is not coated on the curved section.
Further, one of the first pole piece and the second pole piece is an anode piece, and the other of the first pole piece and the second pole piece is a cathode piece;
the first pole piece comprises a first current collector and first active material layers coated on two sides of the first current collector;
the second electrode sheet includes a second current collector and second active material layers coated on both sides of the second current collector.
Further, the polarity of the third pole piece is the same as the polarity of the first pole piece, or the polarity of the third pole piece is the same as the polarity of the second pole piece.
Further, the solar cell further comprises a first external electrode tab and a second external electrode tab, the first external electrode tab is connected with the first pole piece, the second external electrode tab is connected with the second pole piece, and the third pole piece is connected with the first external electrode tab or the second external electrode tab.
A second aspect of the present utility model provides a battery comprising a housing, an electrolyte, and a cell as in any of the first aspects, the cell being located within the housing, the electrolyte being injected into the housing in which the cell is mounted.
According to the battery cell and the battery, the third pole piece is arranged, one end of the third pole piece is covered on the outer surface of the first pole piece or the second pole piece at the uppermost side, the other end of the third pole piece is wound to the outer surface of the first pole piece or the second pole piece at the lowermost side and is covered on the outer surface of the first pole piece or the second pole piece at the lowermost side, so that the uppermost pole piece and the lowermost pole piece of the battery cell are integrally connected, the third pole piece can be arranged to be coated with the active material layer only on one side, and the uppermost pole piece and the lowermost pole piece of the battery cell are covered on the active material layer only on one side through the third pole piece, so that the problem that the stress born by two sides of the pole pieces is different, and the outermost pole piece of the battery cell is curled and wrinkled is solved, and the quality of the lithium ion battery is improved.
Drawings
Fig. 1 is a schematic cross-sectional structure of a battery cell according to an embodiment of the present utility model;
fig. 2 is a schematic cross-sectional structure of another cell provided in an embodiment of the present utility model;
FIG. 3 is a schematic view of the third pole piece of FIG. 1;
FIG. 4 is a schematic view of the third pole piece of FIG. 2;
fig. 5 is a schematic cross-sectional view of a first tab in a direction parallel to a tab in a battery cell according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a cross-sectional structure of a second tab in a direction parallel to a tab position of a battery cell according to an embodiment of the present utility model;
reference numerals illustrate:
100-a first pole piece; 110-a first tab; 200-a second pole piece; 210-second pole ear; 300-a third pole piece; 310-single-sided paste application zone; 311-first straight section, 312-second straight section; 313-bending section; 320-empty foil area; 321-a first end; 322-second end; 330-third ear; 400-membrane; 500-insulating layers; 600-a first external tab; 700-second external tab.
Detailed Description
The technical scheme of the utility model is clearly and thoroughly described below with reference to the accompanying drawings. In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. Furthermore, in the description of the present utility model, the meaning of "at least one" means one or more, unless specifically defined otherwise.
In the description of the present specification, the term "on the basis of the above-described embodiment" means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one preferred embodiment or preferred example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same implementations or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1 to 4, the first aspect of the present embodiment provides an electrical core, including a first pole piece 100, a second pole piece 200, and a membrane 400, where the membrane 400 is located between the first pole piece 100 and the second pole piece 200 and is used to electrically insulate the first pole piece 100 and the second pole piece 200, and a plurality of first pole pieces 100 and a plurality of second pole pieces 200 are alternately stacked, where polarities of the first pole piece 100 and the second pole piece 200 are opposite, specifically, one of the first pole piece 100 and the second pole piece 200 is an anode piece, and the other of the first pole piece 100 and the second pole piece 200 is a cathode piece;
the battery cell further includes a third pole piece 300, one end of the third pole piece 300 covers the outer surface of the first pole piece 100 or the second pole piece 200 at the first outermost side, the other end of the third pole piece 300 winds at least onto the outer surface of the first pole piece 100 or the second pole piece 200 at the second outermost side, and the first outermost side and the second outermost side are oppositely arranged along the thickness direction (i.e. the y-axis direction in fig. 2) of the battery cell, specifically, the first outermost side may be the uppermost side of the battery cell, and the second outermost side may be the lowermost side of the battery cell.
According to the battery cell provided by the embodiment, one end of the third pole piece is covered on the outer surface of the first pole piece or the second pole piece at the uppermost side, the other end of the third pole piece is wound to the outer surface of the first pole piece or the second pole piece at the lowermost side and is covered on the outer surface of the first pole piece or the second pole piece at the lowermost side, so that the uppermost pole piece and the lowermost pole piece of the battery cell are integrally connected, the third pole piece can be arranged to be coated with an active material layer only on one side, and the uppermost pole piece and the lowermost pole piece of the battery cell are covered on the active material layer only on one side through the third pole piece, so that the problems of curling and wrinkling of the pole piece at the outermost side of the battery cell caused by different stresses born by the two sides of the pole piece in the prior art can be solved, and the quality of the lithium ion battery is improved.
A separator 400 is provided between the third electrode sheet 300 and the first electrode sheet 100, or a separator 400 is provided between the third electrode sheet 300 and the second electrode sheet 200, thereby separating positive and negative active materials and preventing the two electrodes from being in contact to short-circuit.
As shown in fig. 1 and 2, the first electrode sheet 100 includes a first current collector and first active material layers coated on both side surfaces of the first current collector; the second electrode sheet 200 includes a second current collector and second active material layers coated on both side surfaces of the second current collector; therefore, the active material layers are coated on the two side surfaces of the first pole piece 100 and the second pole piece 200, which is beneficial to improving the energy density of the battery cell.
Specifically, when the first electrode sheet 100 is a positive electrode sheet, the first current collector is a positive electrode current collector, the first active material layer is a positive electrode active material layer, and then the second electrode sheet 200 is a negative electrode sheet, the second current collector is a negative electrode current collector, and the second active material layer is a negative electrode active material layer; or when the first electrode sheet 100 is a negative electrode sheet, the first current collector is a negative electrode current collector, the first active material layer is a negative electrode active material layer, the second electrode sheet 200 is a positive electrode sheet, the second current collector is a positive electrode current collector, and the second active material layer is a positive electrode active material layer.
In this embodiment, a person skilled in the art may set materials of the positive current collector and the negative current collector according to actual needs, and the positive current collector may be an aluminum foil and the negative current collector may be a copper foil, for example.
The polarity of the third pole piece 300 is the same as the polarity of the first pole piece 100, or the polarity of the third pole piece 300 is the same as the polarity of the second pole piece 200, i.e., the third pole piece 300 is a positive or negative pole piece. Specifically, the polarity of the third pole piece 300 is associated with whether the first outermost pole piece 100 or the second outermost pole piece 200, if the first outermost pole piece and the second outermost pole piece are the first pole piece 100, the polarity of the third pole piece 300 is opposite to the polarity of the first pole piece 100, and if the first outermost pole piece and the second outermost pole piece are the second pole piece 200, the polarity of the third pole piece 300 is opposite to the polarity of the second pole piece 200.
As shown in fig. 1 and 3, the third electrode 300 may include a single-sided paste coating area 310, where the single-sided paste coating area 310 includes a third current collector and a third active material layer, and the third active material layer is coated on a surface of the third current collector facing the first electrode 100 or the second electrode 200, so that the third active material layer can be prevented from being exposed at an outermost layer of the battery cell, so that all active materials of the active material layers of each electrode of the battery cell are fully utilized, and the energy density of the battery cell is improved.
The single-sided plaster region 310 comprises a first straight section 311 and a second straight section 312 which are oppositely arranged, and a bending section 313 which connects the first straight section 311 and the second straight section 312, wherein the first straight section 311 of the single-sided plaster region 310 at least covers the area of the first outermost side opposite to the first pole piece 100 or the second pole piece 200, and the third pole piece 300 is wound towards the second outermost side along the thickness direction of the electric core, so that the second straight section 312 of the single-sided plaster region 310 at least covers the area of the second outermost side opposite to the first pole piece 100 or the second pole piece 200; therefore, the single-sided paste coating area 310 covers the uppermost side and the lowermost side of the battery cell at the same time, the curling and wrinkling phenomena of the single-sided paste coating area 310 of the third pole piece 300 can be effectively prevented, and the third pole piece 300 only comprises the single-sided paste coating area 310, which is beneficial to reducing the space volume of the battery cell and improving the energy density of the battery cell.
Specifically, as shown in fig. 1, the first outermost pole piece and the second outermost pole piece are both the second pole piece 200, the first flat section 311 of the single-sided paste application region 310 covers at least the area opposite to the second pole piece 200 on the first outermost side, and the third pole piece 300 is wound towards the second outermost layer along the thickness direction of the battery core, so that the second flat section 312 of the single-sided paste application region 310 covers at least the area opposite to the second pole piece 200 on the second outermost side.
On the basis of the above embodiment, the battery cell further includes the insulating layer 500, one end of the insulating layer 500 is connected with the first flat section 311 of the single-sided paste coating area 310, the insulating layer 500 covers the free end of the first flat section 311, the other end of the insulating layer 500 is connected with the second flat section 312 of the single-sided paste coating area 310, and the insulating layer 500 covers the free end of the second flat section 312, thereby, the insulating layer 500 is arranged to prevent the problem of lithium precipitation, and prevent burrs of a cutting port of the free end from piercing the shell, and effectively improve the safety of the battery cell.
Where the free end of the first straight section 311 refers to the end of the first straight section 311 that is not connected to any component, and the free end of the second straight section 312 refers to the end of the second straight section 312 that is not connected to any component.
In this embodiment, the insulating layer 500 may be insulating gummed paper or an insulating coating layer including ceramic particles and a binder.
As shown in fig. 2 and 4, the third electrode sheet 300 may also include a single-sided paste region 310 and an empty foil region 320, one end of the empty foil region 320 being connected to the single-sided paste region 310, the single-sided paste region 310 including a third current collector and a third active material layer coated on one side of the first electrode sheet 100 or the second electrode sheet 200 of the third current collector; the empty foil region 320 includes a third current collector, on which a third active material layer is not coated, i.e., the front and back sides of the third current collector of the empty foil region 320 are blank regions, and no active material is disposed; therefore, the third active material layer can be prevented from being exposed at the outermost layer of the battery cell, so that all active materials of the active material layers of all the pole pieces of the battery cell are fully utilized, and the energy density of the battery cell is improved.
The single-sided plaster region 310 comprises a first straight section 311 and a second straight section 312 which are oppositely arranged, and a bending section 313 which connects the first straight section 311 and the second straight section 312, wherein the first straight section 311 of the single-sided plaster region 310 at least covers the area of the first outermost side opposite to the first pole piece 100 or the second pole piece 200, and the third pole piece 300 is wound towards the second outermost side along the thickness direction of the electric core, so that the second straight section 312 of the single-sided plaster region 310 at least covers the area of the second outermost side opposite to the first pole piece 100 or the second pole piece 200; the empty foil region 320 includes a first end 321 and a second end 322 which are disposed opposite to each other, the first end 321 of the empty foil region 320 is connected to the second flat section 312 of the single-sided plaster region 310, the empty foil region 320 is wound toward the first outermost side in the thickness direction of the battery cell such that the second end 322 of the empty foil region 320 is wound at least to the outer surface of the first flat section 311 of the single-sided plaster region 310, and the empty foil region 320 is disposed opposite to the side of the first flat section 311 of the single-sided plaster region 310 to which the third active material layer is not applied. Therefore, the single-sided paste coating area 310 covers the uppermost side and the lowermost side of the battery cell at the same time, and the empty foil area 320 is arranged at one end of the single-sided paste coating area 310, so that the tension on the two side surfaces of the single-sided paste coating area 310 can be reduced, and the curling and wrinkling phenomena of the single-sided paste coating area 310 of the third pole piece 300 can be further effectively prevented.
Specifically, as shown in fig. 2, the first outermost pole piece and the second outermost pole piece are both the second pole piece 200, the first flat section 311 of the single-sided paste application area 310 covers at least the area opposite to the second pole piece 200 on the first outermost side, and the third pole piece 300 is wound towards the second outermost layer along the thickness direction of the electric core, so that the second flat section 312 of the single-sided paste application area 310 covers at least the area opposite to the second pole piece 200 on the second outermost side; the first end 321 of the blank foil region 320 is connected to the second straight section 312 of the single-sided plaster region 310, the second end 322 of the blank foil region 320 is wound at least to the outer surface of the first straight section 311 of the single-sided plaster region 310, and the blank foil region 320 is disposed opposite to the side of the first straight section 311 of the single-sided plaster region 310 where the third active substance layer is not applied.
On the basis of the above embodiment, the battery cell further includes an insulating layer 500, one end of the insulating layer 500 is connected with the second end 322 of the empty foil region 320, the other end of the insulating layer 500 is connected with the first flat section 311 of the single-sided paste coating region 310, the insulating layer 500 is connected with one side surface of the first flat section 311 of the single-sided paste coating region 310, which is not coated with the third active material layer, and the insulating layer 500 covers the free end of the second end 322 of the empty foil region 320, thereby, burrs of a cutting port of the free end can be prevented from penetrating through the shell by the insulating layer 500, and the safety of the battery cell can be effectively improved.
Wherein the free end of the second end 322 of the hollow foil region 320 refers to the end of the free end of the second end 322 of the hollow foil region 320 that is not connected to any component.
In the above embodiment, the third active material layers are coated on one surfaces of the first flat section 311, the second flat section 312 and the third current collector of the curved section 313 of the single-sided paste coating area 310, so that the energy density of the battery cell can be further improved in order to further improve the utilization rate of all the active materials of the active material layers, on the basis of the above embodiment, the third active material layers are coated on one surfaces of the third current collector of the first flat section 311 and the second flat section 312, the third active material layers are not coated on the third current collector of the curved section 313, that is, the front and back surfaces of the third current collector on the curved section 313 are blank areas, and no active material is provided.
It should be noted that, in the present embodiment, the dimension of the third pole piece 300 along the winding direction is not limited, and those skilled in the art may set the dimension of the third pole piece 300 along the winding direction according to practical situations, preferably, the dimension of the third pole piece 300 along the winding direction is greater than or equal to two times the sum of the width of the first pole piece 100 (i.e. the dimension along the x-axis direction in fig. 2) and the thickness of the battery cell, and the dimension of the single-sided paste area 310 of the third pole piece 300 along the winding direction is equal to two times the sum of the width of the first pole piece 100 and the thickness of the battery cell.
In this embodiment, the materials of the third current collector and the third active material layer may be set by those skilled in the art according to actual needs, and this is not further limited in this embodiment.
As shown in fig. 5 and fig. 6, the battery cell in this embodiment further includes a first external tab 600 and a second external tab 700, where the first electrode tab 100 is not limited to being provided with first electrode tabs 110 by die cutting, each first electrode tab 110 is connected to one first external tab 600, and the second electrode tab 200 is not limited to being provided with second electrode tabs 210 by die cutting, each second electrode tab 210 is connected to one second external tab 700.
The third pole piece 300 is not limited to being provided with a third tab 330 by die cutting, and the polarity of the third tab 330 may be the same as that of the first tabs 110, so that the third tab 330 and each first tab 110 are connected to a first external tab 600; alternatively, the third tab 330 may have the same polarity as the second tab 210, and the third tab 330 and each second tab 210 are connected to a second external tab 700.
The second aspect of the present embodiment also provides a battery comprising a housing, an electrolyte, and a cell as shown in the first aspect, the cell being located in the housing, the electrolyte being injected into the housing in which the cell is mounted.
The battery cell comprises a first pole piece 100, a second pole piece 200, a third pole piece 300 and a diaphragm 400, wherein the first pole piece 100, the second pole piece 200 and the third pole piece 300 are all in contact with electrolyte, chemical energy in the electrolyte is converted into electric energy, and current generated on the first pole piece 100, the second pole piece 200 and the third pole piece 300 can be conducted to an anode and a cathode on the shell through a first external electrode lug 600 and a second external electrode lug 700 on the current.
According to the battery provided by the embodiment, the third pole piece is arranged, one end of the third pole piece is covered on the outer surface of the first pole piece or the second pole piece at the uppermost side, the other end of the third pole piece is wound to the outer surface of the first pole piece or the second pole piece at the lowermost side and is covered on the outer surface of the first pole piece or the second pole piece at the lowermost side, so that the uppermost pole piece and the lowermost pole piece of the battery core are integrally connected, the third pole piece can be arranged to be coated with the active material layer only on one side, and the uppermost pole piece and the lowermost pole piece of the battery core are covered on the active material layer only on one side through the third pole piece, so that the problem that the stress born by two sides of the pole pieces is different, and the outermost pole piece of the battery core is curled and wrinkled is solved, and the quality of the lithium ion battery is improved.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.
Claims (10)
1. The battery cell is characterized by comprising a plurality of first pole pieces and second pole pieces which are alternately stacked, wherein the polarities of the first pole pieces and the second pole pieces are opposite;
the device further comprises a third pole piece, one end of the third pole piece is covered on the outer surface of the first pole piece or the second pole piece at the first outermost side, and the other end of the third pole piece at least winds on the outer surface of the first pole piece or the second pole piece at the second outermost side;
the first outermost side and the second outermost side are oppositely arranged along the thickness direction of the battery cell.
2. The cell of claim 1, wherein the third electrode tab comprises a single-sided paste region;
the single-sided paste coating area comprises a third current collector and a third active material layer, and the third active material layer is coated on one side of the third current collector facing the first pole piece or the second pole piece;
the single-sided paste coating area comprises a first flat section and a second flat section which are oppositely arranged, wherein the first flat section at least covers the area of the first outermost side opposite to the first pole piece or the second pole piece, and the second flat section at least covers the area of the second outermost side opposite to the first pole piece or the second pole piece.
3. The cell of claim 2, further comprising an insulating layer having one end connected to the first straight section and the other end connected to the second straight section, the insulating layer covering free ends of the first straight section and the second straight section.
4. The cell of claim 1, wherein the third tab comprises a single-sided pasted region and an empty foil region;
the single-sided paste coating area comprises a third current collector and a third active material layer, and the third active material layer is coated on one side of the third current collector facing the first pole piece or the second pole piece;
the empty foil region comprises a third current collector, the third current collector being uncoated with the third active material layer;
the single-sided paste coating area comprises a first flat section and a second flat section which are oppositely arranged, the first flat section at least covers the area of the first outermost side opposite to the first pole piece or the second pole piece, and the second flat section at least covers the area of the second outermost side opposite to the first pole piece or the second pole piece;
the first end of the empty foil area is connected with the second straight section, the second end of the empty foil area at least winds to the outer surface of the first straight section, and the empty foil area is arranged opposite to one side of the first straight section, which is not coated with the third active substance layer.
5. The cell of claim 4, further comprising an insulating layer having one end connected to the second end of the hollow foil region, the other end connected to the first straight section, and the insulating layer covering a free end of the second end of the hollow foil region.
6. The cell of claim 2 or 4, wherein the third pole piece further comprises a curved section between the first and second straight sections, the curved section connecting the first and second straight sections, the curved section being uncoated with the third active material layer.
7. The cell of claim 1, wherein one of the first and second pole pieces is a positive pole piece and the other of the first and second pole pieces is a negative pole piece;
the first pole piece comprises a first current collector and first active material layers coated on two sides of the first current collector;
the second electrode sheet includes a second current collector and second active material layers coated on both sides of the second current collector.
8. The cell of claim 1, wherein the polarity of the third pole piece is the same as the polarity of the first pole piece or the polarity of the third pole piece is the same as the polarity of the second pole piece.
9. The cell of claim 1, further comprising a first external tab and a second external tab, wherein the first external tab is connected to the first pole piece, the second external tab is connected to the second pole piece, and the third pole piece is connected to the first external tab or the second external tab.
10. A battery comprising a housing, an electrolyte, and the cell of any one of claims 1 to 9, the cell being located within the housing, the electrolyte being injected into the housing in which the cell is mounted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222561453.4U CN219123266U (en) | 2022-09-27 | 2022-09-27 | Battery cell and battery |
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| CN202222561453.4U CN219123266U (en) | 2022-09-27 | 2022-09-27 | Battery cell and battery |
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| CN219123266U true CN219123266U (en) | 2023-06-02 |
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| CN202222561453.4U Active CN219123266U (en) | 2022-09-27 | 2022-09-27 | Battery cell and battery |
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| CN (1) | CN219123266U (en) |
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2022
- 2022-09-27 CN CN202222561453.4U patent/CN219123266U/en active Active
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